JP6388273B2 - Bus duct plug-in hole protection structure - Google Patents

Description

Detailed Description of the Invention

  The present invention relates to a bus duct plug-in hole protection structure, for example, a plug-in hole protection structure provided in a bus duct.

  Conventionally, as a protection structure for a plug-in hole of a bus duct, there is a plug-in connection part protection device as shown in Patent Document 1. In this plug-in connection protection device, a cover made of an electric insulator is attached around the plug-in connection, and a pair of elastic lip pieces are provided so as to face each other at the plug-in terminal insertion port of the cover so that they always adhere to each other. The elastic lip piece is opened when the connecting end piece of the plug-in device is inserted and opened, and when the connecting end piece is pulled out, the elastic lip piece is returned to the original position to close it. Yes. This prevents dust from entering the plug-in hole.

Japanese Utility Model Publication No. 49-20295

  However, since the plug-in hole protection structure described in Patent Document 1 described above is for the purpose of preventing the entry of a light substance that floats in the air, such as dust, an electrically insulating resin that is deformed entirely by elasticity. The cover (elastic lip piece) can be used to protect the plug-in hole. In the bus duct in which many plug-in holes are provided in advance on the entire electric trunk line, for example, the operator can be protected from electric shock. There is a technical problem that there is anxiety about the protection strength when it is aimed.

  In order to solve this point, it is conceivable to increase the thickness of the electrical insulating resin cover in Patent Document 1 described above or to change the material to a material having high rigidity. There is a problem that the insertion of the in-instrument is hindered. That is, in the plug-in hole protection structure described in Patent Document 1, there is a trade-off relationship between the strength of protection and the ease of insertion of plug-in equipment (constructability). It is difficult to achieve both strong protection aimed at preventing the damage and workability during plug-in.

  The present invention has been made in view of the above technical problem, and in a plug-in hole of a bus duct, a protective structure capable of achieving both strong protection for preventing an electric shock of an operator and workability during plug-in. The purpose is to provide.

  The present invention made to solve the above technical problem is a bus duct plug-in hole protection structure when a plug-in device is attached to and detached from a plug-in hole provided in a housing of a bus duct. A shutter member that closes the plug-in hole so as to be openable and closable and a spring member that urges the shutter member in a direction to close the plug-in hole are provided, and the plug-in device includes the plug into the plug-in hole. A shutter opening portion is formed which moves (slides, rotates, etc.) the shutter member in the opening direction in accordance with the operation of bringing the in-apparatus closer.

Thus, in the bus duct plug-in hole protection structure of the present invention, since the shutter member that closes the plug-in hole and the spring member that biases the shutter member in the closing direction are formed by separate members, the strength of the shutter member And the strength of the spring member can be set separately. That is, according to the present invention, it is possible to provide a strong protection structure by increasing the strength of the shutter member without deteriorating the workability at the time of plug-in. Therefore, it is possible to provide a protective structure capable of achieving both strong protection for preventing the damage and workability during plug-in.
Further, the present invention provides a bus duct plug-in for connecting to a conductor of a plug-in device while inserting a contact of the plug-in device into a plug-in hole formed in a housing of the bus duct that forms an electric trunk line and has at least one conductor. In the hole protection structure, the bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and the plug-in device has the door in accordance with an operation of bringing the plug-in device close to the plug-in hole. The door opening part which moves a member to an opening direction is provided, It is characterized by the above-mentioned.
Further, according to the present invention, a frame having an opening is provided in the bus duct so that the opening overlaps the plug-in hole, and the door member can open and close the opening with respect to the frame. The plug-in hole is closed so that it can be opened and closed by being attached so as to be closed.

Further, according to the present invention, the housing is formed with a protruding portion that protrudes in a substantially convex shape from the inside to the outside of the substantially square-shaped space in a cross-sectional view, so that the housing is substantially inside the protruding portion. A concave protruding space is formed, and a part of a member related to closing the plug-in hole is arranged in the protruding space. Furthermore, according to the present invention, the spring member is characterized Rukoto disposed in the protruding space.

  For this reason, the plug-in hole such as a part of the shutter member or the spring member is closed without hindering the space insulation distance or creepage distance between the bus duct conductor housed inside the bus duct and the housing as much as possible. Part of the members involved can be housed inside the housing of the bus duct. That is, it is possible to avoid as much as possible a situation in which the bus duct becomes enormous in order to secure a space insulation distance, a creepage distance, and the like due to providing a member related to closing the plug-in hole such as a shutter member. In addition, even if a situation occurs in which the spring member disposed in the protruding space is disconnected due to some unforeseen situation in the state where it is attached to the housing 11, the cut spring member hangs down and touches the conductor in the housing. Can be avoided by the spring movement restricting portion.

According to the present invention, the shutter member (door member) includes a first shutter member (first door member) and a second shutter member (second door member), and the first shutter member ( first door member) . Ends of the first door member and the second shutter member (second door member) are arranged to face each other, and the plug-in hole is opened and closed in a double-open manner.

  For this reason, even if a force in the direction in which one shutter member opens is applied, the other shutter member does not open. That is, for example, when the operator touches the shutter member inadvertently, the first shutter member does not open. The risk of both the shutter member and the second shutter member opening at once can be avoided as much as possible, and the protection of the plug-in hole is strengthened accordingly.

  Further, according to the present invention, the first shutter member and the second shutter member are connected to each other by the spring member, and are biased in the closing direction of the plug-in hole.

  For this reason, the first shutter member and the second shutter member are connected by the spring member to be unitized, and handling during assembly becomes easy. Furthermore, since both the first shutter member and the second shutter member are urged by one spring member, the number of spring members is halved and the structure is simple and the number of components is smaller than providing spring members for each. , No cost.

According to the present invention, the shutter member (door member) opens and closes the plug-in hole by sliding along the longitudinal direction of the bus duct conductor.
Furthermore, the present invention provides a bus duct plug-in when a contact of a plug-in device is inserted into a plug-in hole provided in a housing of a bus duct that forms an electric main line and has at least one conductor, and is connected to the conductor. In the hole protection structure, the bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed by sliding along a longitudinal direction of the conductor of the bus duct. A door opening part that slides the door member in an opening direction according to an operation of bringing the plug-in device close to the in-hole is provided, and the door opening part is inserted when the contactor is inserted into the plug-in hole. The door member has an open piece that comes into contact with an end portion of the door member, and the oblique side of the open piece comes into contact with the end portion of the door member obliquely. And wherein the sliding in the opening direction.

  For this reason, for example, when an operator inadvertently touches the shutter member, the shutter member does not open even if a force in a direction orthogonal to the plug-in hole is applied. Protection is strong.

  Further, according to the present invention, there is provided a restricting portion that restricts the movement of the shutter member beyond a predetermined position by the biasing of the spring member.

  For this reason, the situation where the shutter member moves beyond a predetermined position can be avoided with a simple structure.

Further, according to the present invention, the bastact is provided with a lock member for locking the shutter member (door member) to move in the opening direction, and the plug-in device includes the plug into the plug-in hole. An unlocking unit is provided that moves the lock member in accordance with the operation of moving the in-apparatus closer to release the shutter member (door member) from being locked by the lock member.
Further, the present invention provides a bus duct plug-in for connecting to a conductor of a plug-in device while inserting a contact of the plug-in device into a plug-in hole formed in a housing of the bus duct that forms an electric trunk line and has at least one conductor. In the hole protection structure, the bus duct is locked with a door member that closes the plug-in hole so that the plug-in hole can be opened, a spring member that urges the door member in the closing direction, and the door member that moves in the opening direction. And a locking member that moves the door member in an opening direction in response to an operation of bringing the plug-in device closer to the plug-in hole, and the plug-in device includes a plug opening to the plug-in hole. An unlocking portion that moves the lock member in accordance with the operation of bringing the in-apparatus closer to unlock the door member by the lock member; It is characterized in that.

  For this reason, for example, when an operator inadvertently touches the shutter member, the lock is not released, so the shutter member does not open, and the plug-in hole is further protected. On the other hand, since the shutter member is automatically unlocked when the plug-in device is inserted close to the plug-in hole, it can be easily inserted without impairing workability as much as possible.

  According to the present invention, at least a part of the lock member is exposed to the outside. For this reason, it is possible to determine at a glance whether or not the shutter is locked. For example, even if the lock member has a problem due to some reason and the lock member is not locked in a situation where it should be locked, the shutter member It is possible to determine a defect by visual inspection without performing an operation such as checking by pressing.

Further, according to the present invention, the shutter member (door member) has the rotation shaft, and the plug-in hole is opened and closed by the rotation of the rotation shaft (when the door is pressed by the door opening portion, the rotation shaft rotates). To open the plug-in hole). Further, the shutter opening portion (door opening portion) of the plug-in device rotates the shutter member (door member) by pressing a portion close to the rotating shaft of the shutter member (door member) at a vertical or near vertical angle. It is characterized by moving. Therefore, the amount of rotation of the shutter member (door member) in the opening direction with respect to the insertion length of the plug-in device, and the rotation of the shutter member (door member) in the closing direction with respect to the insertion length of the plug-in device in the inserted state. The amount of movement becomes large, and quick opening and closing becomes possible. As a result, the moving distance of the plug-in device for opening and closing the shutter member (door member) can be shortened. As a result, for example, it is possible to reduce the construction space secured in advance around the bus duct in consideration of attachment / detachment of the plug-in device.
Furthermore, the present invention provides a bus duct plug-in when a contact of a plug-in device is inserted into a plug-in hole provided in a housing of a bus duct that forms an electric main line and has at least one conductor, and is connected to the conductor. In the hole protection structure, the bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and the plug-in device has the door in accordance with an operation of bringing the plug-in device close to the plug-in hole. A door opening portion for moving the member in the opening direction is provided, and the door member has a rotation shaft. When the door member is pressed by the door opening portion, the rotation shaft rotates to open the plug-in hole. The rotating shaft is arranged above the upper surface of the housing of the bus duct.

According to the present invention, in the lock member, the unlocked portion to be pressed by the unlocking portion is provided inside the housing. That is, the lock member is provided so as not to protrude above the upper surface of the door member.
Furthermore, in the present invention, the lock member is provided with an unlocked portion that receives the pressure of the unlocking portion, and at least a part of the unlocked portion is disposed below the door member. Thus, the movement of the door member in the opening direction is locked.

  For this reason, for example, even when the operator touches the shutter member inadvertently, the operator does not touch the unlocked portion, that is, the lock is not inadvertently released. Plug-in hole protection becomes even stronger.

  According to the invention, in the lock member, at least a part of the unlocked portion to be pressed by the unlocking portion is located inside the plug-in hole in a plan view of the plug-in hole. It is characterized by that.

  For this reason, when it is desired to open the shutter member for maintenance or the like while having a lock function, the shutter member can be easily released by releasing the lock by directly operating the unlocked portion.

According to the invention, the lock member is provided with the unlocked portion that is unlocked by pressing the unlocking portion, and at least a part of the unlocked portion is the plug-in. It is characterized by being located inside the plug-in hole in a plan view of the hole.
Furthermore, in the present invention, the lock member is provided with an unlocked portion that receives the pressure of the unlocking portion, and in the state where the door member closes the plug-in hole , At least a part of the door member is disposed inside a region occupied by the plug-in hole in a plan view, whereby the door member is locked from moving in the opening direction.

  For this reason, the bus duct plug-in hole protection structure is more compact than when the unlocked portion is located outside the plug-in hole in a plan view of the plug-in hole.

  Further, according to the present invention, the lock release portion is inserted into the housing through a minute gap between the shutter member and the plug-in hole, or the end portion of the first shutter member is (2) The shutter member is inserted into the housing through a minute gap with the end of the shutter member, and the shutter member is unlocked by the lock member.

  For this reason, even if the unlocked part is located inside the plug-in hole in a plan view of the plug-in hole, the unlocked part can be pressed by the unlocking part.

  Further, according to the present invention, the member around the gap is formed with a lock release guide portion that is inclined toward the gap.

  For this reason, even when the position of the plug-in device is slightly shifted, the position of the lock release portion is corrected to the gap by the guide, so that the insertion can be smoothly performed.

Further, according to the present invention, the plug-in device is provided with a branching contact and a holder for the contact, and the holder has at least one function of the unlocking portion and the shutter opening portion. Alternatively, the contact has a function of at least one of the unlocking part and the shutter opening part.
Furthermore, the present invention provides a bus duct plug-in when a contact of a plug-in device is inserted into a plug-in hole provided in a housing of a bus duct that forms an electric main line and has at least one conductor, and is connected to the conductor. In the hole protection structure, the bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and a spring member that urges the door member in the closing direction, and the contact of the plug-in device includes The plug-in device also functions as a door opening portion that moves the door member in the opening direction in accordance with the operation of bringing the plug-in device closer to the plug-in hole.

For this reason, since it is not necessary to form a lock release part or a shutter opening part (door opening part) as a separate member, the structure becomes simple and the manufacturing cost is reduced.
Further, the bus duct has a plurality of bus duct conductors in the housing, and the plug-in device is provided with a plurality of contacts that contact the plurality of bus duct conductors when attached to the bus duct, The plug-in hole of the bus duct is formed to have a size that allows the plurality of contacts to be inserted together.

  ADVANTAGE OF THE INVENTION According to this invention, in the plug-in hole of a bus duct, the protection structure which can make the strong protection for preventing an electric shock etc. of an operator compatible with the workability at the time of plug-in can be provided.

  Further, by accommodating a part of the member involved in closing the plug-in hole with respect to the substantially concave protruding space of the housing, the space insulation between the bus duct conductor housed in the bus duct and the housing is accommodated. A part of the member involved in closing the plug-in hole can be accommodated in the housing of the bus duct without hindering the distance, the creepage distance, and the like as much as possible. That is, it is possible to avoid as much as possible the situation where the bus duct becomes enormous in order to secure the space insulation distance, creepage distance, etc. due to the provision of the shutter member and the like.

  Further, by providing the lock member, for example, when an operator inadvertently touches the shutter member, the lock is not released, so the shutter member does not open, and the plug-in hole is further protected. It will be something. On the other hand, since the lock of the shutter member is automatically released when the plug-in device is inserted close to the plug-in hole, it can be easily inserted without losing the workability as much as possible.

It is a figure which shows the bus duct of the bus duct plug-in-hole protection structure of 1st Embodiment of this invention, (a) is a top view, (b) is a side view. It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of 1st Embodiment of this invention, (a) is a schematic cross section of AA, (b) is a schematic cross section of BB. (C) is a schematic cross-sectional view of CC. It is a schematic diagram which shows the process of inserting a plug-in apparatus into the plug-in hole of the bus duct plug-in hole protection structure of 1st Embodiment of this invention, (a) is a figure before insertion, (b) is instruction | indication circle S1 part (C) is an enlarged view of the indicated circle S1 portion (during insertion), and (d) is an enlarged view of the indicated circle S1 portion (after insertion). It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of 2nd Embodiment of this invention, (a) is a schematic cross section, (b) is a schematic cross section of DD, (c ) Is a schematic cross-sectional view of EE. It is a schematic diagram which shows the process which inserts a plug-in apparatus into the plug-in hole of the bus duct plug-in hole protection structure of 2nd Embodiment of this invention, (a) is an enlarged view before insertion, (b) is in insertion An enlarged view, (c) is an enlarged view after insertion. It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of 3rd Embodiment of this invention, (a) is a top view, (b) is a schematic cross section of FF, (c) Is a schematic cross-sectional view of GG. It is a figure which shows the detail of the lock member of the bus duct plug-in-hole protection structure of 3rd Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a side view. is there. It is a figure which shows the detail of the lock member accommodating part of the bus duct plug-in-hole protection structure of 3rd Embodiment of this invention, (a) is a top view, (b) is a front view, (c) is H It is a schematic cross section of -H. It is a figure which shows the detail of the lock structure in the bus duct plug-in hole protection structure of 3rd Embodiment of this invention, (a) is a figure which shows a locked state, (b) is a figure which shows a lock release state. It is a top view which shows the detail of the locked state of the shutter member in the bus duct plug-in hole protection structure of 3rd Embodiment of this invention. It is a schematic diagram which shows the process of inserting a plug-in apparatus into the plug-in hole of the bus duct plug-in hole protection structure of 3rd Embodiment of this invention, (a) is a figure before insertion, (b) is instruction | indication circle S2 part (C) is an enlarged view of the indicated circle S2 portion (unlocked), and (d) is an enlarged view of the indicated circle S2 portion (after insertion). It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of 4th Embodiment of this invention, (a) is a top view, (b) is a schematic cross section of II, (c) Is a schematic cross-sectional view of JJ. It is a schematic diagram which shows the process of inserting a plug-in apparatus into the plug-in hole of the bus duct plug-in hole protection structure of 4th Embodiment of this invention, (a) is a figure before insertion, (b) is instruction | indication circle S3 part (C) is an enlarged view of the indicated circle S3 portion (unlocked state), and (d) is an enlarged view of the indicated circle S3 portion (after insertion). It is a figure which shows the bus duct of the bus duct plug-in-hole protection structure of 5th Embodiment of this invention, (a) is a top view, (b) is a side view. It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct (bus duct connection part) of 5th Embodiment of this invention, (a) is a top view, (b) is a schematic cross section of KK. (C) is a schematic cross-sectional view of LL. It is a schematic diagram which shows the process which inserts a plug-in apparatus into the plug-in hole of the bus duct plug-in hole protection structure of 5th Embodiment of this invention, (a) is a figure before insertion, (b) is instruction | indication circle S4 part (C) is an enlarged view of the instruction circle S4 portion (unlocked state), and (d) is an enlarged view of the instruction circle S4 portion (after insertion). It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of the modification 1 of this invention, (a) is a schematic cross section, (b) is a schematic cross section of MM, (c) Is a schematic cross-sectional view of NN. It is a schematic diagram which shows the process of inserting a plug-in apparatus in the plug-in hole of the bus duct plug-in hole protection structure of the modification 1 of this invention, (a) is the figure before insertion, (b) is the figure in insertion. (C) is the figure after insertion. It is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of the modification 2 of this invention, (a) is a top view, (b) is a schematic cross section of OO, (c) is It is a schematic cross section of PP. It is a figure which shows the detail of the locking member of other embodiment of this invention, (a) is a top view, (b) is a front view, (c) is a side view. It is a schematic diagram used for description of the movement of the lock member and lock spring member of other embodiment of this invention, (a) is a figure before lock spring member compression, (b) is a figure after lock spring member compression. It is a perspective view which shows the detail of the lock member of other embodiment (modification 3) of this invention. It is a perspective view which shows the detail of the shutter member of the modification 3 of this invention, (a) is an upper perspective view of a shutter obstruction | occlusion state, (b) is a lower perspective view of a shutter obstruction | occlusion state, (c) is. It is an upper perspective view of a shutter open state, (d) is a lower perspective view of a shutter open state. It is a perspective view which shows the process of inserting the plug-in apparatus of the modification 3 of this invention, (a) is a figure before insertion, (b) is a figure in insertion. It is a schematic cross section of the bus duct plug-in hole protection structure of Modification 4 of the present invention. It is a figure which shows the detail of the shutter member of the bus duct plug-in-hole protection structure of the modification 4 of this invention, (a) is a top view at the time of shutter closing, (b) is a side view at the time of shutter closing, (C) is a bottom view when the shutter is closed, (d) is a plan view when the shutter is opened, (e) is a side view when the shutter is opened, and (f) is a bottom view when the shutter is opened. is there.

  Hereinafter, the bus duct plug-in hole protection structure of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and can be applied within the scope of the gist of the present invention, such as partially combining the embodiments and deleting unnecessary portions.

<< First Embodiment >>
First, the bus duct plug-in hole protection structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1A and 1B are views showing a bus duct having a bus duct plug-in hole protection structure according to the first embodiment of the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a side view. Moreover, FIG. 2 is a figure which shows the detail of the bus duct plug-in-hole protection structure and bus duct of 1st Embodiment of this invention, (a) is a schematic cross section of AA, (b) is B- It is a schematic cross section of B, (c) is a schematic cross section of CC. FIG. 3 is a schematic view showing a process of inserting the plug-in device into the plug-in hole of the bus duct plug-in hole protection structure according to the first embodiment of the present invention. FIG. ) Is an enlarged view of the instruction circle S1 part (before insertion), (c) is an enlarged view of the instruction circle S1 part (during insertion), and (d) is an enlarged view of the instruction circle S1 part (after insertion).

  The bus duct plug-in-hole protection structure 1 according to the first embodiment includes, for example, a plurality of air-insulated bus duct conductors 2 (in this case, four RST three-phase plus four neutral phases) that are insulated by an air layer. There is provided a plug-in device 20 having a bus duct 10 housed therein and a plurality of (in this case, four) contacts 21 corresponding to each bus duct conductor 2 of the bus duct 10 (see FIG. 3). The contact 21 of the plug-in device 20 is inserted (plugged in) into the plug-in hole 12 provided in the bus duct 10 and connected to the bus duct conductor 2, so that the bus duct 10 as the main trunk of the electric trunk line is connected. On the other hand, the plug-in device 20 is electrically connected. Hereinafter, the details of the bus duct plug-in hole protection structure 1 of the first embodiment will be described.

  First, the bus duct 10 constituting the bus duct plug-in hole protection structure 1 of the first embodiment will be described. As shown in FIGS. 1 and 2, the bus duct 10 includes four air-insulated bus duct conductors 2 insulated by an air layer, supported by an insulating holder (not shown) and disposed inside the housing 11. The housing 11 as a whole has a hollow, substantially rectangular parallelepiped shape (that is, a substantially rectangular shape) in a sectional view, and is formed by combining a pair of housing halves. The insulation of the bus duct 10 is not limited to the air insulation type, but may be an insulation coating type that is insulated by covering with an insulating sheet.

  The pair of housing halves includes a substantially U-shaped upper housing half 11a opened downward in a sectional view and a substantially U-shaped lower housing half 11b opened upward in a sectional view. The upper housing half body 11a and the lower housing half body 11b have reinforcing portions 14 as projecting portions formed by projecting and deforming both side walls so as to project substantially inwardly from the inside in a sectional view. It is provided along the longitudinal direction of the bus duct 10 to improve the strength of the entire bus duct 10 forming the electric trunk line.

  Further, the lower housing half 11b is formed such that its width (interval between the side walls) is slightly narrower than the width of the upper housing half 11a. As a result, when the open end of the lower housing half 11b is placed upward and the open end of the upper housing opposite 11a is covered from above, the side wall reinforcing portions 14 are fitted together, and the side wall The housing 11 is assembled by fixing the fitting portion with screws or the like. And the reinforcement space 15 (15a and 15b in order from the top) as a substantially concave-shaped protruding space is formed inside the reinforcing portion 14 on both side walls in the assembled housing 11 as the side walls protrude and deform into a substantially convex shape. 15c) is formed.

  As shown in FIG. 1, a plurality of plug-in holes 12 are formed on the upper surface of the upper housing half 11a at a predetermined interval, and are closed by a shutter member 13 disposed inside the upper housing half 11a. . Here, as an example, a case where a plurality of plug-in holes 12 are formed in the upper housing half 11a will be described. However, the plug-in holes 12 may be formed in the lower housing half 11b or the upper housing half 11a. Both the housing half 11a and the lower housing half 11b may be used, and the number and arrangement thereof are not particularly limited.

  As shown in FIG. 2, the shutter member 13 serving as a door member or an opening / closing member that closes the plug-in hole 12 faces each other as if the plug-in hole 12 was divided in the longitudinal direction of the bus duct 10. A pair of first shutter member 13a and second shutter member 13b arranged in this manner, and each of the first shutter member 13a and second shutter member 13b can span between the reinforcing spaces 15a on both side walls. A length of the blocking portion 13c is formed. Further, slide portions 13d that are slightly lower than the height of the reinforcing space 15a are formed on both ends of the closing portion 13c. In other words, the first shutter member 13a and the second shutter member 13b are positioned inside the reinforcing space 15a and slidable when the closing portion 13c is bridged over the reinforcing spaces 15a and 15a on both side walls of the housing 11. 13d is slidably accommodated in the reinforcing space 15a. Thus, the first shutter member 13a and the second shutter member 13b can slide open and close the plug-in hole 12 in a double-open manner.

  Thus, since the shutter member 13 of the first embodiment is a slide opening / closing type, for example, when an operator carelessly touches the shutter member 13, a force in a direction perpendicular to the plug-in hole 12 is generated. Even if added, the shutter member 13 does not open, and the protection of the plug-in hole 12 is strengthened accordingly. Further, since the shutter member 13 is a double-opening slide opening type composed of the first shutter member 13a and the second shutter member 13b, even if a force in the direction in which one shutter member opens is applied, the other shutter member does not open. In other words, for example, when an operator inadvertently touches the shutter member, the risk of both the first shutter member 13a and the second shutter member 13b opening at once can be avoided as much as possible. Therefore, the protection of the plug-in hole 12 becomes strong.

  Further, the first shutter member 13a and the second shutter member 13b are provided from the outer side to the inner side of the plug-in hole 12 over the entire end side of the closing part 13c that contacts each other when the plug-in hole 12 is closed. A shutter opening guide portion 13e that is inclined toward the surface is provided. When a shutter opening portion (door opening portion) of the plug-in device 20 described later is pressed against the shutter opening guide portion 13e, the movement in the direction in which the plug-in device 20 is inserted changes the first shutter member 13a and the second shutter member 13a. The shutter member 13b is converted into a movement that slides in the opening direction. The shutter opening guide portion 13e may be formed in at least a portion where the shutter opening portion to be described later contacts among the end sides of the closing portion 13c that contact each other when the plug-in hole 12 is closed.

  Further, the first shutter member 13 a and the second shutter member 13 b are connected to each other by a spiral (coil) spring member 16. Specifically, a spring engaging portion 13f is provided in the vicinity of the slide portion 13d of the first shutter member 13a at a position opposite to the second shutter member 13b in the closing portion 13c, and the second shutter member 13b. A spring locking portion 13f is provided at a position on the opposite side of the first shutter member 13a in the closing portion 13c in the vicinity of the slide portions 13d on both sides. The spring member 16 is locked so as to connect the spring locking portion 13f of the first shutter member 13a and the spring locking portion 13f of the second shutter member 13b.

  Thereby, since the first shutter member 13a and the second shutter member 13b are attracted to each other by the spring member 16, the first shutter member 13a and the second shutter member 13b are biased toward each other, that is, in a direction to close the plug-in hole 12. ing. At this time, since both the first shutter member 13a and the second shutter member 13b are urged by one spring member 16, the number of spring members is halved as compared with the case where the spring members are separately provided, Therefore, the structure is simple, the number of parts is small, and cost is not required.

  One end of the first shutter member 13a and one end of the second shutter member 13b are connected by a spring member 16, and the other end of the first shutter member 13a and the other end of the second shutter member 13b. Are connected by the spring member 16, the first shutter member 13 a and the second shutter member 13 b and the two spring members 16 are unitized (FIG. 2B). That is, when the housing 11 is assembled, it is only necessary to attach the unitized first shutter member 13a and second shutter member 13b and the two spring members 16, so that individual members are attached separately. There is an advantage that the assembling work becomes easier compared to.

  Here, the first shutter member 13a and the second shutter member are inserted into the reinforcing space 15a by fastening bolts or screws or driving rivets or the like so as to penetrate the upper plate from the outside of the upper housing half 11a. A restricting portion 17 for restricting the movement of 13b is provided. For example, the restricting portion 17 is provided at substantially the center of the plug-in hole 12 in the longitudinal direction of the bus duct 10, so that the first shutter member 13 a moves beyond the restricting portion 17 to the second shutter member 13 b side. In addition to the restriction, the movement of the second shutter member 13b beyond the restriction portion 17 to the first shutter member 13a side is restricted. The restricting portion 17 may be provided separately for the first shutter member 13a and the second shutter member 13b.

  Thus, even when the spring member 16 is not fixed to the housing 11 of the bus duct 10 as in the bus duct plug-in hole protection structure 1 of the first embodiment, the first shutter member 13a and the second shutter member 13b are in a predetermined position. If the first shutter member 13a and the second shutter member 13b are displaced and the plug-in hole 12 is inadvertently opened, the restricting portion 17 is provided in the reinforcing space 15a. This can be easily avoided with only a simple structure.

  Thus, the bus duct 10 of the bus duct plug-in hole protection structure 1 of the first embodiment is formed, and the shutter member 13 (the first shutter member 13a and the second shutter member 13b) that closes the plug-in hole 2, and Since the spring member 16 that biases the shutter member 13 in the closing direction is formed by a separate member, the strength of the shutter member 13 and the strength of the spring member 16 can be set separately. That is, according to the present invention, since a strong protective structure can be provided without deteriorating the workability at the time of plug-in of the plug-in device 20, it is possible to provide a strong protection and plug for preventing an electric shock of an operator. It is possible to provide a protective structure capable of achieving both workability during in-run.

  Further, in the bus duct 10 of the bus duct plug-in-hole protection structure 1 according to the first embodiment, the housing 11 having a substantially rectangular shape in cross section has a protruding portion that protrudes in a substantially convex shape from the inside to the outside in the cross sectional view. The reinforcing part 14 is formed, and a part of the member constituting the shutter member 13, the spring member 16, and the restricting part 17 (that is, a part of the member related to closing the plug-in hole) are included in the reinforcing part. 14 is disposed in a reinforcing space 15a as a substantially concave protruding space inside. For this reason, a plug-in hole such as a part of the shutter member 13 and the spring member 16 is provided without hindering the space insulation distance, creepage distance, and the like between the bus duct conductor 2 housed inside the bus duct 10 and the housing 11 as much as possible. A part of the member involved in closing the housing can be accommodated in the housing 11. That is, the situation where the bus duct 10 becomes enormous in order to secure a space insulation distance, a creepage distance, and the like due to providing a member related to closing the plug-in hole such as the shutter member 13 is avoided as much as possible. obtain.

  Next, the plug-in device 20 constituting the bus duct plug-in hole protection structure 1 of the first embodiment will be described. As shown in FIG. 3, the plug-in device 20 includes a box-shaped main body 22 in which a circuit breaker or the like (not shown) is housed, and a main body 22 corresponding to each bus duct conductor 2 of the bus duct 10. A plurality of (in this case, for example, four) clip-like contacts 21 that are provided in a protruding manner, an insulating holder 23 made of an insulating resin for supporting and protecting the contacts 21, and the shutter member 13 are opened. And a shutter opening 24 for the purpose.

  Here, in the insulating holder 23, a plurality of grooves 23a for receiving the bus duct conductor 2 at the time of plug-in are formed side by side in accordance with the position of the bus duct conductor 2 of the bus duct 10, and the contact 21 is arranged in the groove 23a. ing. The insulating holder 23 has a substantially rectangular parallelepiped shape as a whole, and is formed in a substantially similar shape slightly smaller than the plug-in hole 12 in a bottom view.

  The shutter opening portion 24 is provided along the side wall 23b on both sides of the insulating holder 23, and is formed to have the same width as the side wall 23b or wider than the side wall 23b. Accordingly, when the plug-in is inserted, when the first shutter member 13a and the second shutter member 13b are opened by the shutter opening portion 24, the first shutter member 13a and the second shutter member 13b are inserted into the insulating holder 23 without being caught. be able to. Note that the bus duct 10 and the plug-in device 20 can be grounded via the shutter opening portion 24 by forming the shutter opening portion 24 as a main component and using conductive members. Further, the shutter opening portion 24 is formed with a bilaterally symmetrical isosceles triangle-shaped opening piece 24 a that protrudes downward from the insulating holder 23. The open piece 24a is slightly bent toward the insulating holder 23 side. This facilitates insertion of the opening piece 24a of the shutter opening portion 24 into the plug-in hole 12 when the plug-in is inserted.

  Thus, the plug-in device 20 of the bus duct plug-in hole protection structure 1 according to the first embodiment is formed and is characterized in that the shutter opening portion 24 is provided.

  Hereinafter, the operation when the plug-in device 20 is inserted into the plug-in hole 12 in the bus duct plug-in hole protection structure 1 of the first embodiment will be described with reference to FIG.

  FIGS. 3A and 3B are views showing a state before the plug-in device 20 is inserted into the plug-in hole 12 of the bus duct 10, and an opening piece having a substantially isosceles triangular shape of the shutter opening portion 24. The plug-in device 20 is disposed so that the tip of 24a is positioned substantially immediately above the portion where the shutter opening guide portion 13e of the first shutter member 13a and the shutter opening guide portion 13e of the second shutter member 13b are in contact.

  FIG. 3C is a diagram showing a state in which the operation of inserting the plug-in device 20 closer to the plug-in hole 12 is started, and the opening piece 24a of the substantially isosceles triangular shape of the shutter opening portion 24 is shown. The tip is in contact with the shutter opening guide portion 13e of the first shutter member 13a and the shutter opening guide portion 13e of the second shutter member 13b, and the first shutter member 13a and the second shutter member 13b are slid in a direction away from each other. ing. In other words, when the substantially triangular opening piece 24a of the shutter opening portion 24 is pressed against the shutter opening guide portion 13e, the operation in the direction in which the plug-in device 20 is inserted closer is the first shutter member 13a and the second shutter member 13a. The operation is converted into an operation of sliding the shutter member 13b in the opening direction, and the plug-in hole 12 is opened when the force exceeds the urging force of the spring member 16.

  FIG. 3D is a diagram illustrating a state in which the operation of inserting the plug-in device 20 into the plug-in hole 12 is completed. The first shutter is opened by the substantially isosceles triangular opening piece 24 a of the shutter opening portion 24. The member 13 a and the second shutter member 13 b are opened, and the insulating holder 23 and the contact 21 protected by the insulating holder 23 are inserted into the plug-in hole 12. As a result, each clip-shaped contact 21 sandwiches the corresponding bus duct conductor 2, and electrical connection between the bus duct 10 and the plug-in device 20 is achieved.

  In addition, an erroneous insertion preventing rib 23c is formed in the approximate center of the front side of the insulating holder 23 (see FIG. 3A). Further, an incorrect insertion prevention notch 12a is formed at the edge of the plug-in hole 12 for allowing the erroneous insertion prevention rib 23c to pass during plug-in (see FIGS. 1A and 2B). Thereby, in the bus duct plug-in hole protection structure 1, the plug-in device 20 is inserted by the erroneous insertion prevention rib 23 c of the insulating holder 23 in the direction other than passing through the erroneous insertion prevention notch 12 a of the plug-in hole 12 at the time of plug-in. Is prevented.

  As described above, the bus duct plug-in hole protection structure 1 according to the first embodiment performs the operation of inserting (approaching) the plug-in device 20 into the plug-in hole 12 of the bus duct 10 as shown in FIG. → As shown in (d), the first shutter member 13a and the second shutter member 13b are automatically opened.

  In the bus duct plug-in hole protection structure 1 according to the first embodiment, the first shutter member 13a and the second shutter member 13b are springs for the operation of the shutter member 13 when the plug-in device 20 is pulled out from the plug-in hole 12. Since the member 16 is always urged in the closing direction of the plug-in hole 12, the operation is simply the reverse of the insertion, and the first shutter as shown in FIG. 3 (d) → (c) → (b). The member 13a and the second shutter member 13b are automatically closed.

  As described above, the bus duct plug-in hole protection structure 1 of the first embodiment closes the plug-in hole 12 with the shutter member 13 when the plug-in device 20 is not connected, and plugs in the plug-in hole 12 of the bus duct 10. When the apparatus 20 is attached / detached, the shutter member 13 is automatically opened and closed according to the operation thereof, and both strong protection for preventing an electric shock of the operator and workability at the time of plug-in are provided. Can provide.

<< Second Embodiment >>
Next, a bus duct plug-in hole protection structure 100 according to a second embodiment of the present invention will be described with reference to FIGS. 4A and 4B are diagrams showing details of the bus duct plug-in hole protection structure and the bus duct according to the second embodiment of the present invention, wherein FIG. 4A is a schematic cross-sectional view, and FIG. 4B is a schematic cross-section taken along DD. It is a figure and (c) is a schematic cross section of EE. FIG. 5 is a schematic diagram showing a process of inserting the plug-in device into the plug-in hole of the bus duct plug-in hole protection structure according to the second embodiment of the present invention, and (a) is an enlarged view before insertion. b) is an enlarged view during insertion, and (c) is an enlarged view after insertion.

  The bus duct plug-in hole protection structure 100 of the second embodiment differs from the bus duct plug-in hole protection structure 1 of the first embodiment in the structure of the shutter member and the spring member. Therefore, in this second embodiment, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first embodiment, and different parts from the first embodiment (that is, shutter members and spring members). The structure of the same structure) will be described in detail, and the description of the same configuration will be omitted.

  As shown in FIG. 4, the shutter member 13 of the second embodiment includes a pair of first shutter member 13 a and second shutter member 13 b that can slide open and close the plug-in hole 12 in a double-open manner, as in the first embodiment. And are connected to each other by a spiral (coil) spring member 116 and a connecting member 18 made of, for example, a bolt and a nut.

  Specifically, a spring stopper 113f is provided at a position on the second shutter member 13b side of the slide portion 13d of the first shutter member 13a so as to bend and extend the slide portion 13d inward. A spring stopper 113f is provided at a position on the first shutter member 13a side of the slide portion 13d of the second shutter member 13b so as to bend and extend the slide portion 13d inward. The spring stoppers 113f of the first shutter member 13a and the second shutter member 13b are each provided with an insertion hole 113g that can be inserted through the connecting member 18 and cannot be inserted through the spring member 116. .

  Then, the connecting member 18 is inserted so as to connect the insertion hole 113g of the first shutter member 13a and the insertion hole 113g of the second shutter member 13b, and one of the spring stopper 113f of the first shutter member 13a and one of the connecting members 18 is connected. The connecting member 18 is inserted into the spiral spring member 116 so that the first spring member 116 is accommodated between the end 18a of the second shutter member 13b and the spring stopper 113f of the second shutter member 13b. The connecting member 18 is inserted into the spiral spring member 116 so that the second spring member 116 is accommodated between the other end 18 b of the connecting member 18.

  As a result, the spring member 116 on the first shutter member 13a side is configured to press one end portion 18a of the connecting member 18 at one end side and press the spring stopper 113f on the other end side. Similarly, the spring member 116 on the second shutter member 13a side presses the other end portion 18b of the connecting member 18 on the other end side and presses the spring stopper 113f on one end side.

  Thus, in the bus duct plug-in hole protection structure 100 according to the second embodiment, the first shutter member 13a and the second shutter member 13b approach each other by the spring member 116, that is, the direction in which the plug-in hole 12 is closed. Each other is energized. As a result, also in the bus duct plug-in hole protection structure 100 of the second embodiment, the same effect as the bus duct plug-in hole protection structure 1 of the first embodiment described above can be obtained.

  On the other hand, in the bus duct plug-in hole protection structure 100 according to the second embodiment, the spring member 116 is provided separately for each of the first shutter member 13a and the second shutter member 13b and is connected to the spiral spring member 116. The point where the member 18 is inserted is different from the first shutter member 13a and the second shutter member 13b of the bus duct plug-in hole protection structure 1 of the first embodiment.

  As a result, even if the spring member 116 is disconnected due to some cause, the spring member 116 is inserted into the connecting member 18, so that the disconnected spring member 116 hangs down, and the bus duct conductor 2 and the housing 11. It is possible to avoid the occurrence of situations such as obstructing the space insulation distance and creepage distance between the two and the short circuit with the bus duct conductor 2.

  In the bus duct plug-in hole protection structure 100 according to the second embodiment, part of the members constituting the shutter member 13, the spring member 116, the restricting portion 17, and the connecting member 18, that is, the plug-in hole 12 is closed. A part of the member concerned is arrange | positioned in the substantially concave reinforcement space 15 (in this case, especially reinforcement part 15a) inside the reinforcement part 14. FIG. For this reason, some of the members involved in closing the plug-in hole 12 without hindering the space insulation distance, creepage distance, etc. between the bus duct conductor 2 and the housing 11 housed inside the bus duct 10 as much as possible. Can be stored in the housing 11. That is, also in the bus duct plug-in hole protection structure 100 of the second embodiment, the bus duct 10 is provided in order to ensure a space insulation distance, a creepage distance, and the like due to the provision of the shutter member 13 as in the first embodiment. It is possible to avoid the situation that becomes huge as much as possible.

  Hereinafter, the operation of the shutter member 13 when the plug-in device 20 is inserted close to the plug-in hole 12 in the bus duct plug-in hole protection structure 100 of the second embodiment will be described with reference to FIG.

  FIG. 5A is a diagram showing a state immediately before the contact 21 of the plug-in device 20 is inserted close to the plug-in hole 12 of the bus duct 10. The shutter opening 24 has a substantially isosceles triangular shape. The plug-in device 20 is arranged so that the tip of the opening piece 24a is positioned almost directly above the portion where the shutter opening guide portion 13e of the first shutter member 13a and the shutter opening guide portion 13e of the second shutter member 13b are in contact. Yes.

  FIG. 5B is a diagram illustrating a state in which the operation of inserting the plug-in device 20 closer to the plug-in hole 12 is started, and the opening piece 24a having a substantially isosceles triangular shape of the shutter opening portion 24 is illustrated. The tip is in contact with the shutter opening guide portion 13e of the first shutter member 13a and the shutter opening guide portion 13e of the second shutter member 13b, and the first shutter member 13a and the second shutter member 13b are slid in a direction away from each other. ing. That is, when the substantially triangular opening piece 24a of the shutter opening portion 24 is pressed against the shutter opening guide portion 13e, the operation in the direction in which the plug-in device 20 is inserted is the first shutter member 13a and the second shutter member. It is converted into an operation of sliding 13b in the opening direction, and when the force exceeds the urging force of the spring member 116, the plug-in hole 12 is opened.

  FIG. 5C is a diagram illustrating a state in which the operation of inserting the plug-in device 20 into the plug-in hole 12 is completed. The first shutter is opened by the substantially isosceles triangular opening piece 24 a of the shutter opening portion 24. The member 13 a and the second shutter member 13 b are opened, and the insulating holder 23 and the contact 21 protected by the insulating holder 23 are inserted into the plug-in hole 12. As a result, each clip-shaped contact 21 sandwiches the corresponding bus duct conductor 2, and electrical connection between the bus duct 10 and the plug-in device 20 is achieved.

  As described above, the bus duct plug-in hole protection structure 100 of the second embodiment is also provided by the insertion operation of the plug-in device 20 into the plug-in hole 12 of the bus duct 10, similarly to the bus duct plug-in hole protection structure 1 of the first embodiment. As shown in FIGS. 5 (a) → (b) → (c), the first shutter member 13a and the second shutter member 13b are automatically opened.

  Further, in the bus duct plug-in hole protection structure 100 of the second embodiment, the operation of the shutter member 13 when the plug-in device 20 is pulled out from the plug-in hole 12 is the same as that of the bus duct plug-in hole protection structure 1 of the first embodiment. Similarly, since the first shutter member 13a and the second shutter member 13b are always urged in the closing direction of the plug-in hole 12 by the spring member 116, the operation is simply the reverse of the insertion, and FIG. ) → (b) → (a), the first shutter member 13a and the second shutter member 13b are automatically closed.

  As described above, the bus duct plug-in hole protection structure 100 of the second embodiment also closes the plug-in hole 12 with the shutter member 13 when the plug-in device 20 is not connected, and plugs in the plug-in hole 12 of the bus duct 10. When the apparatus 20 is attached / detached, the shutter member 13 is automatically opened and closed according to the operation thereof, and both strong protection for preventing an electric shock of the operator and workability at the time of plug-in are provided. Can provide.

<< Third Embodiment >>
Next, a bus duct plug-in hole protection structure 200 according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a diagram showing details of the bus duct plug-in hole protection structure and the bus duct according to the third embodiment of the present invention, where (a) is a plan view and (b) is a schematic cross-sectional view of FF. (C) is a schematic cross-sectional view of GG. FIG. 7 is a diagram showing details of the lock member of the bus duct plug-in hole protection structure according to the third embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c). Is a side view. FIG. 8 is a diagram showing details of the lock member storage portion of the bus duct plug-in hole protection structure according to the third embodiment of the present invention, where (a) is a plan view and (b) is a front view. (C) is a schematic cross section of HH. Moreover, FIG. 9 is a figure which shows the detail of the lock structure in the bus duct plug-in hole protection structure of 3rd Embodiment of this invention, (a) is a figure which shows a locked state, (b) is an unlocked state FIG. In FIG. 9, the lock member 30 is particularly shown with diagonal lines so that the configuration can be easily understood. FIG. 10 is a plan view showing details of the locked state of the shutter member in the bus duct plug-in hole protection structure of the third embodiment of the present invention. FIG. 11 is a schematic view showing a process of inserting the plug-in device into the plug-in hole of the bus duct plug-in hole protection structure according to the third embodiment of the present invention. FIG. ) Is an enlarged view of the instruction circle S2 portion (before insertion), (c) is an enlarged view of the instruction circle S2 portion (unlocked), and (d) is an enlarged view of the instruction circle S2 portion (after insertion).

  The bus duct plug-in hole protection structure 200 of the third embodiment is different from the first and second embodiments in the opening / closing mechanism of the shutter member (door member or opening / closing member), and also has a lock mechanism and a lock release mechanism. Have. Therefore, in the third embodiment, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first embodiment and the second embodiment, and the first embodiment and the second embodiment. (Ie, the structure of the shutter member, the lock mechanism, and the lock release mechanism) will be described in detail, and the description of the same configuration will be omitted.

  First, as shown in FIG. 6, the shutter members 213 of the bus duct plug-in hole protection structure 200 according to the third embodiment face each other as if the plug-in holes 12 were divided in the longitudinal direction of the bus duct 10. It has a pair of first shutter member 213a and second shutter member 213b arranged, and a frame body 213h provided so as to surround these shutter member 213a and second shutter member 213b, and is unitized as a whole. The bus duct 10 is fitted into the plug-in hole 12 from the outside of the upper housing half 11a.

  Each of the first shutter member 213a and the second shutter member 213b has a closed portion 213c positioned on the upper surface when a region surrounded by the frame body 213h (hereinafter also referred to as a plug-in hole 12 for convenience) is closed. And a pair of columnar rotation shafts 213i for rotatably holding the first shutter member 213a and the second shutter member 213b so as to open the door to the plug-in hole 12 (FIG. 6 and FIG. 11).

  In addition, a cylindrical rotation hole (not shown) having a diameter slightly larger than that of the rotation shaft 213i is formed on the inner wall of the frame body 213h at a position corresponding to the rotation shaft 213i. As a result, the first shutter member 213a and the second shutter member 213b are held in a state where the rotation shaft 213i is rotatable in the rotation hole of the frame body 213h, so that the plug-in hole 12 can be opened and closed in a double door manner. Has been made. It should be noted that the opening and closing of this pivoting type (in this case, double-spreading type) may be of any structure, whether by attaching a hinge member separately or by forming a thin portion.

  Further, the closing portion 213c is formed so that its thickness is reduced to about ½ in the middle from the rotation shaft 213i side to the tip side, and further reduced to about ½ on the tip side. A shutter opening guide portion 213e corresponding to the shutter opening guide portion 13e of the first and second embodiments is provided at a portion where the thickness changes on the distal end side of the closing portion 213c.

  In addition, in the closing portion 213c of the first shutter member 213a and the second shutter member 213b, a shutter locking portion 213j extends from the upper end of the inner wall of the frame 213h at the upper portion of the portion having a thickness of about ½. (See FIG. 6). Thereby, although the 1st shutter member 213a and the 2nd shutter member 213b can be rotated and opened in the inner direction of the housing 11 rather than the state which closed the plug-in hole 12, it blocked the plug-in hole 12 It cannot be opened outward of the housing 11 from the state. If the first shutter member 213a and the second shutter member 213b can be locked so as not to be opened in the outer direction of the housing 11 from the state in which the plug-in hole 12 is closed, the position where the shutter locking portion 213j is provided, The size and number are appropriate.

  Further, a spiral (coil) spring member 216 is inserted through the rotation shaft 213i of the first shutter member 213a, one end of which is locked to the back surface of the first shutter member 213a, and the other end is a frame body. The inner wall of 213h is locked. Similarly, with respect to the rotation shaft 213i of the second shutter member 213b, the spring member 216 is similarly inserted and one end thereof is locked to the back surface of the second shutter member 213b, and the other end is attached to the inner wall of the frame 213h. It is designed to be locked.

  Thereby, the shutter member 213 of the bus duct plug-in hole protection structure 200 of the third embodiment biases each of the first shutter member 213a and the second shutter member 213b so as to rotate from the inside to the outside of the housing 11. doing.

  As a result, the first shutter member 213a and the second shutter member 213b are configured to always block the plug-in hole 12 in a state where the plug-in device is not connected, and the biasing force of the spring member 216 is increased. When the plug-in device is inserted with a force exceeding, the plug-in hole 12 is opened, and when the connected plug-in device is pulled out, the plug-in hole 12 is automatically closed.

  Next, a lock mechanism for the shutter member 213 in the bus duct plug-in hole protection structure 200 according to the third embodiment will be described. This locking mechanism is configured so that the first shutter member 213a and the second shutter member 213b rotate in a double-opening manner in the locked state so as not to open the plug-in hole 12, but can be opened when the lock is released. The first shutter member 213a and the second shutter member 213b are provided in the vicinity of the end of the end where the first shutter member 213a and the second shutter member 213b are abutted in the closed state (the portion of the instruction circle S2 in FIG. 6). As shown in FIG. 10, the lock member 30 is realized by being slidable with respect to the lock member storage portion 40 formed in the frame body 213 h of the shutter member 213.

  Specifically, as shown in FIG. 7, the lock member 30 includes a flat plate-like lock base portion 31 that is substantially square in plan view, and a lock head that protrudes upward from a substantially central portion of the upper surface of the lock base portion 31 in a substantially square column shape. Part 32. On the other hand, as shown in FIG. 8, the lock member storage portion 40 is formed inside a frame body 213 h of the shutter member 213, and has a shape substantially the same as the front view of the lock member 30 and can be inserted into the lock member 30. An opening 41, a slide chamber 42 in which the inserted lock member 30 is slidably accommodated, and an engaging portion 43 for continuously holding the inserted lock member 30 so as not to slide from the predetermined position toward the front side opening 41. An upper surface side opening 44 for exposing the upper surface of the lock head 32 of the inserted lock member 30 upward, and a leaf spring-shaped lock spring that biases the inserted lock member 30 toward the front side opening 41. And a spring holding chamber 45 for housing the member 50 (see FIG. 9).

  As long as the lock member 30 and the lock member storage portion 40 can be installed in a state in which the lock member 30 is slidable in the lock member storage portion 40 formed in the frame body 213h of the shutter member 213, the shape of each part is determined. The size is appropriate.

  The lock mechanism of the bus duct plug-in hole protection structure 200 according to the third embodiment is configured such that the lock spring member 50 is set from the front side opening 41 to the spring holding chamber 45 of the lock member storage portion 40 from the lower opening. When 30 is inserted, as shown in FIG. 9A, the lock member 30 is pressed against the engaging portion 43 by the urging force of the lock spring member 50. In this state, a part of the lock base 31 protrudes from the inner wall of the frame body 213h to the plug-in hole 12 side (hereinafter referred to as the protruding portion 33). As shown in FIG. The protruding portion 33 is disposed below the end of the end where the first shutter member 213a and the second shutter member 213b are in contact with each other in the closed state, so that the first shutter member 213a and the second shutter member 213b are disposed. Is configured to lock (that is, lock) the opening of the housing 11 by rotating in the inner direction of the housing 11. That is, this is a locked state.

  On the other hand, in the lock mechanism of the bastact plug-in hole protection structure 200 of the third embodiment, when the protruding portion 33 of the lock base 31 is pushed toward the frame body 213h with a force exceeding the urging force of the lock spring member 50, FIG. As shown in b), the lock member 30 slides in the slide chamber 42 and moves to the back of the lock member storage portion 40, and the protruding portion 33 is stored in the lock member storage portion 40. In this state, the first shutter member 213a and the second shutter member 213b (not shown) can be rotated and opened in a double-sided manner toward the inner side of the housing 11. That is, the lock is released.

  In this way, in the bus duct plug-in hole protection structure 200 according to the third embodiment, the first shutter member 213a and the second shutter member 213b can be locked or released from rotating and opening in the inner direction of the housing 11. (That is, the lock can be turned ON / OFF). The first shutter member 213a and the second shutter member 213b may be improved in strength by forming a rib (not shown) as a reinforcing portion or attaching a reinforcing member. In particular, by providing a reinforcing portion along the longitudinal direction of each of the first shutter member 213a and the second shutter member 213b, the first shutter member 213a and the second shutter member 213b warp due to, for example, unexpected pressing by a finger. That is, the situation where the first shutter member 213a and the second shutter member 213b are warped and the locking by the lock member 30 is released and the lock is released can be avoided as much as possible.

  Next, the lock release mechanism in the bastact plug-in hole protection structure 200 of the third embodiment will be described. Regarding this unlocking mechanism, first, the plug-in device 220 constituting the bus duct plug-in hole protection structure 200 of the third embodiment will be described with respect to the parts different from the plug-in device 20 of the first embodiment and the second embodiment. .

  As shown in FIG. 11, the plug-in device 220 is provided with shutter opening portions 224 formed integrally with the insulating holder 23 so as to extend downward from the side walls 23 b on both sides of the insulating holder 23. A substantially isosceles triangular open piece 224 a that protrudes downward from the holder 23 is formed. The opening piece 224a has a sharper tip, and is located between the shutter opening guide portion 213e of the first shutter member 213a and the shutter opening guide portion 213e of the second shutter member 213b (see FIG. 10s). Easy to insert.

  From substantially the vicinity of the center of the shutter opening portion 224, a flat plate-like unlocking portion 60 that is narrow in the longitudinal direction of the bus duct 10 protrudes downward at a position outside the both side walls of the insulating holder 23 in plan view. Has been. Further, the unlocking portion 60 has a tapered substantially triangular releasing piece 61 which is tapered toward the lower end, and a tapered substantially triangular releasing piece 62 which is also tapered toward the upper end.

  On the other hand, in the bus duct plug-in hole protection structure 200 according to the third embodiment, as shown in FIG. 10, the shutter member 213 is a portion where the first shutter member 213 a and the second shutter member 213 b are abutted in the closed state. A slit 213s through which the plate-like unlocking portion 60 can be inserted is formed at the end of the plate. The slit 213s is a minute gap formed by cutting out both corners of the end sides where the first shutter member 213a and the second shutter member 213b face each other into a rectangle.

  When the lock release portion 60 of the plug-in device 220 is inserted into the slit 213 s, the release piece 61 is pressed against the protruding portion 33 as the lock release portion of the lock member 30. The operation in the direction of inserting the release portion 60 is converted into an operation of pushing the protruding portion 33 of the lock base portion 31 toward the frame body 213h, whereby the lock member 30 is stored in the lock member storage portion 40, and the first shutter member The lock of 213a and the second shutter member 213b is released.

  In this way, in the bus duct plug-in hole protection structure 200 of the third embodiment, the lock of the first shutter member 213a and the second shutter member 213b is released as the plug-in device 220 is inserted closer. It is made like that.

  That is, in the bus duct plug-in hole protection structure 200 according to the third embodiment, the lock member 30 is provided to prevent the first shutter member 213a and the second shutter member 213b from being opened, while the plug-in hole 12 is plugged in. The lock by the lock member 30 can be released in accordance with the operation of inserting the device 220 close. Thereby, for example, when an operator inadvertently touches the shutter member 213, the shutter member does not open because it is locked, and the protection of the plug-in hole 12 becomes even stronger. . On the other hand, when the plug-in device 220 is inserted close to the plug-in hole 12, the lock of the shutter member 213 is automatically released, so that smooth insertion is possible without affecting the workability.

  Further, in the bus duct plug-in hole protection structure 200 of the third embodiment, the upper surface of the lock head 32 of the lock member 30 is exposed to the outside (upward) from the upper surface side opening 44 of the lock member storage portion 40, It can be easily seen. As a result, it can be determined at a glance whether or not it is locked. For example, even if there is a problem with the lock member due to some factor and a state where the lock member is not locked in a situation where it should be locked occurs, the shutter A defect can be determined only by visual inspection without performing an operation such as confirming by pressing a member.

  Further, in the bus duct plug-in hole protection structure 200 according to the third embodiment, the protruding portion 33 as the unlocked portion of the lock member 30 is located inside the housing 11, that is, inside the housing 11 than the first shutter member 213 a and the second shutter member 213 b. , Provided at a position not exposed to the outside of the housing 11. For this reason, for example, even when the operator touches the shutter member inadvertently, the operator does not touch the unlocked portion, that is, the lock is not inadvertently released. Plug-in hole protection becomes even stronger. Note that the state in which the protruding portion 33 is not exposed to the outside of the housing 11 is not only a state where the protrusion 33 is completely blocked and cannot be completely seen from the outside, but also a minute gap (for example, a gap that does not allow a finger or a driver to enter). Including those that are not easily visible or easily touched.

  Further, in the bus duct plug-in hole protection structure 200 according to the third embodiment, in the plan view of the plug-in hole 12, the protruding portion 33 as the unlocked portion of the lock member 30 is disposed inside the region of the plug-in hole 12. ing. For this reason, the space required for providing the bus duct plug-in hole protection structure 200 is reduced as compared with the case where the unlocked portion is arranged outside the plug-in hole region in plan view of the plug-in hole 12. As a result, the bus duct plug-in hole protection structure becomes compact.

  Further, in the bus duct plug-in hole protection structure 200 according to the third embodiment, the first shutter member 213a and the second shutter member 213b are of the double-open type in which the end portions are arranged to face each other, and the first shutter member 213a The unlocking portion 60 is inserted into the housing 11 through a slit 213s between the end and the end of the second shutter member 213b, and the lock member 30 locks the first shutter member 213a and the second shutter member 213b. It is made to cancel. Therefore, even if the protruding portion 33 as the unlocked portion of the lock member 30 is located inside the region of the plug-in hole 12 in a plan view of the plug-in hole 12, the unlocked portion ( The protruding part 33) can be pressed.

  In other words, the bus duct plug-in hole protection structure 200 according to the third embodiment is, in other words, a slit 213s as a minute gap between the first shutter member 213a and the plug-in hole 12 or the second shutter member 213b. The lock release portion 60 is inserted into the housing 11 through a slit 213s as a minute gap between the plug-in hole 12 and the lock member 30 unlocks the first shutter member 213a and the second shutter member 213b. It can also be understood that this is done. Therefore, even if the protruding portion 33 as the unlocked portion of the lock member 30 is located inside the region of the plug-in hole 12 in a plan view of the plug-in hole 12, the unlocked portion ( The protruding part 33) can be pressed.

  In addition to this configuration, in the bus duct plug-in hole protection structure 200 according to the third embodiment, in the first shutter member 213a and the second shutter member 213b, the lock release guide portion 213k that is inclined toward the slit 213s is provided as the shutter release guide portion 213e. Are extended as they are (see FIG. 10). For this reason, even when the position with respect to the plug-in hole 12, that is, the position of the unlocking part 60 with respect to the slit 213s is slightly shifted when the plug-in device 220 is inserted, the position of the unlocking part 60 is corrected by the guide 213k. It becomes possible to insert smoothly.

  Hereinafter, in the bus duct plug-in hole protection structure 200 according to the third embodiment, the operation of the shutter member 213 and the lock member 30 when the plug-in device 220 is inserted close to the plug-in hole 12 will be described with reference to FIG. To do.

  FIGS. 11A and 11B are views showing a state before the plug-in device 220 is inserted into the plug-in hole 12 of the bus duct 10, in which the substantially triangular release piece 61 of the lock release unit 60 is shown. The plug-in device 220 is disposed so that the tip is located almost immediately above the slit 213s between the first shutter member 213a and the second shutter member 213b.

  FIG. 11C shows a state in which the lock member 30 is pushed into the frame body 213 h side by the lock release unit 60 and stored in the lock member storage unit 40. Thereby, the lock | rock of the 1st shutter member 213a and the 2nd shutter member 213b is cancelled | released, and it can open in a double-speech type to the inner side direction of the housing 11. FIG.

  FIG. 11D is a diagram showing a state in which the operation of inserting the plug-in device 220 into the plug-in hole 12 is almost completed, and the first shutter member is formed by the substantially triangular opening piece 224a of the shutter opening portion 224. 213a and the second shutter member 213b are rotated in a double-sided manner toward the inside of the housing 11, and the insulating holder 23 and the contact 21 protected by the insulating holder 23 are inserted into the plug-in hole 12. . As a result, each clip-shaped contact 21 sandwiches the corresponding bus duct conductor 2, and electrical connection between the bus duct 10 and the plug-in device 220 is achieved.

  In the state where the insertion of the plug-in device 220 is completed, the lock release portion 60 is inserted to the lower side of the bus duct conductor 2, so that the lock member 30 is again engaged with the locking portion 43 of the lock member storage portion 40. It has returned to the position where it can be stopped. Accordingly, it is possible to avoid keeping the lock spring member 50 in a compressed state while the plug-in device 220 is continuously attached to the bus duct 10, and the elastic force of the lock spring member 50 deteriorates after long-term use. Thus, it is possible to avoid as much as possible a situation that causes a problem in locking the first shutter member 213a and the second shutter member 213b. Further, since it is not necessary to form the lock member 60 by the height of the insulating holder 23, the number of members is reduced, and the cost can be reduced.

  As described above, the bus duct plug-in hole protection structure 200 according to the third embodiment is configured as shown in FIGS. 11B to 11C by inserting the plug-in device 220 into the plug-in hole 12 of the bus duct 10. In addition, the first shutter member 213a and the second shutter member 213b are automatically opened while the first shutter member 213a and the second shutter member 213b are automatically unlocked.

  In the bus duct plug-in hole protection structure 200 according to the third embodiment, regarding the operation of the shutter member 213 when the plug-in device 220 is pulled out from the plug-in hole 12, the first shutter member 213a and the second shutter member 213b are springs. Since the member 216 is always urged in the closing direction of the plug-in hole 12, the operation is simply the reverse of the insertion, and the first shutter as shown in FIG. 11 (d) → (c) → (b). After the member 213a and the second shutter member 213b are automatically closed, the lock member 30 is automatically locked by returning to the original position by the lock spring member 50.

  As described above, in the state where the plug-in device 220 is mounted, the lock member 30 is returned to the same position as that at the time of locking. Therefore, when the plug-in device 220 is pulled out, the lock member 30 is housed in the lock member housing portion 40 by the release piece 62 provided on the upper portion of the lock release portion 60, and then the first shutter member 213a and the second shutter member 213b. Is closed, and then the lock member 30 returns to the locked state and is locked automatically in response to the operation of pulling out the plug-in device 220.

  As described above, the bus duct plug-in-hole protection structure 200 according to the third embodiment is locked so that the first shutter member 213a and the second shutter member 213b are rotated in a double-sided manner toward the inner side of the housing 11 and opened. Therefore, for example, even when an operator inadvertently touches the shutter member 213, the shutter member is not opened, and the plug-in hole 12 is further protected. On the other hand, when the plug-in device 220 is inserted close to the plug-in hole 12, the shutter member 213 is automatically unlocked, and therefore can be easily inserted without impairing workability.

<< 4th Embodiment >>
Next, a bus duct plug-in hole protection structure 300 according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a diagram showing details of the bus duct plug-in hole protection structure and the bus duct according to the fourth embodiment of the present invention, where (a) is a plan view and (b) is a schematic cross-sectional view taken along II. (C) is a schematic sectional view of JJ. FIG. 13 is a schematic view showing a process of inserting the plug-in device into the plug-in hole of the bus duct plug-in hole protection structure according to the fourth embodiment of the present invention. FIG. ) Is an enlarged view of the instruction circle S3 portion (before insertion), (c) is an enlarged view of the instruction circle S3 portion (unlocked state), and (d) is an enlarged view of the instruction circle S3 portion (after insertion).

  The bus duct plug-in hole protection structure 300 according to the fourth embodiment is different from the first to third embodiments in the lock mechanism and the lock release mechanism. Therefore, in the fourth embodiment, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first to third embodiments, and the first to third embodiments. The parts different from the above (namely, the lock mechanism and the unlock mechanism) will be described in detail, and the description of the parts having the same configuration will be omitted.

  First, the lock mechanism of the shutter member 313 in the bus duct plug-in hole protection structure 300 of the fourth embodiment will be described. This lock mechanism is for maintaining the first shutter member 313a and the second shutter member 313b so as not to open the plug-in hole 12 in the locked state, and allowing the first shutter member 313a and the second shutter member 313b to be opened when the lock is released. As shown in FIGS. 12 and 13, the lock member 330 extends from the frame body 313h in the vicinity of the end of the end where the first shutter member 313a and the second shutter member 313b are abutted in the closed state. This is realized by providing them integrally.

  Specifically, as shown in FIG. 13, the lock member 330 is, for example, a narrow and thin, substantially strip shape, and is extended with a strength that allows elastic deformation upward from the middle of the inner wall of the frame body 313 h. A locking portion 331 is provided at the tip of the first shutter member 313a and the second shutter member 313b. The locking portion 331 is arranged to lock the upper side of the end of the portion where the first shutter member 313a and the second shutter member 313b are in a closed state. .

  The locking portion 331 prevents the first shutter member 313a and the second shutter member 313b from rotating from the inner side to the outer side of the plug-in hole 12 by the spring member 216, that is, opening the plug-in hole 12 in a double door. It is made like that.

  In addition, the lock member 330 is provided with a lock portion 332 that is disposed so as to engage the lower side of the end of the portion where the first shutter member 313a and the second shutter member 313b are in a closed state. Yes. Here, the protrusion width of the lock portion 332 toward the first shutter member 313a and the second shutter member 313b is formed shorter than the protrusion width of the locking portion 331.

  The lock portion 332 is disposed below the end of the portion where the first shutter member 313a and the second shutter member 313b are in contact with each other in the closed state, so that the first shutter member 313a and the second shutter member 313b are disposed. It locks and prevents (that is, locks) the door 11 from opening inside the housing 11 in a double-spread manner. That is, this is a locked state.

  In addition to such a configuration, a lock is provided between the frame member 313h and the lock member 330 in the shutter member 313 so that the shutter member 313 can be deformed and warped when the lock member 330 is pushed toward the frame member 313h. A member storage space 340 is formed.

  Accordingly, in the bus duct plug-in-hole protection structure 300 according to the fourth embodiment, when the locking portion 331 is pushed toward the frame body 313h with a force exceeding the elastic force of the lock member 330, the lock member 330 is deformed and the frame body is deformed. It will be in the state accommodated in the lock member accommodation space 340, warping to 313h side. At this time, the lock portion 332 of the lock member 330 is also warped toward the frame body 313h, so that the lock portion 332 is unlocked, and the first shutter member 313a and the second shutter member 313b can be opened in the inner direction of the housing 11. It is made like that. That is, this is the unlocked state.

  In this way, also in the bus duct plug-in hole protection structure 300 of the fourth embodiment, the first shutter member 313a and the second shutter member 313b open in a double-sided manner toward the inner side of the housing 11 as in the third embodiment. Can be locked and released (that is, the lock can be turned ON / OFF).

  The shutter member 313 is formed with a conductor holding groove 313m for holding the bus duct conductor 2 inside the housing 11, and also functions as a support holder for supporting the bus duct conductor 2.

  Next, the lock release mechanism in the bus duct plug-in hole protection structure 300 according to the fourth embodiment will be described. Regarding this unlocking mechanism, first, the plug-in device 320 constituting the bus duct plug-in hole protection structure 300 according to the fourth embodiment will be described with respect to the parts different from the plug-in devices according to the first to third embodiments.

  As shown in FIG. 13, the plug-in device 320 is not formed with the shutter opening portion on the both side walls 23b side of the insulating holder 23 as in the first to third embodiments, and as in the third embodiment. No lock releasing part is formed. In the plug-in device 320, the lower end portion 23d on the both side walls 23b side of the insulating holder 23 functions as a lock releasing portion, and the front wall 23e and rear wall 23f side of the insulating holder 23 function as shutter opening portions. It is the lower end part 23g.

  On the other hand, in the bus duct plug-in hole protection structure 300 according to the fourth embodiment, the engaging portion 331 of the lock member 330 has a hypotenuse whose upper portions are rounded toward the first shutter member 313a and the second shutter member 313b. The unlocked portion 333 is formed so as to form.

  When the lower end portions 23d (lock release portions) on both side walls 23b of the insulating holder 23 of the plug-in device 320 are pressed against the unlocked portion 333 in the insertion direction of the plug-in device 320, the plug-in device 320 is moved. The operation in the inserting direction is converted into an operation of pressing the locking portion 331 of the lock member 330 toward the frame body 313h, whereby the lock member 330 is deformed and warps toward the frame body 313h to enter the lock member storage space 340. Be contained. At this time, the lock portion 332 disposed below the first shutter member 313a and the second shutter member 313b also moves to the frame body 313h side, and as a result, the lock is released. .

  Thus, in the bus duct plug-in hole protection structure 300 of the fourth embodiment, the lock of the first shutter member 313a and the second shutter member 313b is released by the insertion of the plug-in device 320.

  That is, in the bus duct plug-in hole protection structure 300 according to the fourth embodiment, the lock member 330 is provided to prevent the first shutter member 313a and the second shutter member 313b from opening, while the plug to the plug-in hole 12 is plugged. The lock by the lock member 330 can be released in accordance with the insertion operation of the in-device 320. As a result, when the plug-in device 320 is inserted close to the plug-in hole 12, the first shutter member 313a and the second shutter member 313b are automatically unlocked, so that the workability is not affected smoothly. Insertion is possible. On the other hand, for example, when an operator inadvertently touches the shutter member 313, the first shutter member 313a and the second shutter member 313b are not opened because they are locked. Protection is further strengthened.

  In the bus duct plug-in hole protection structure 300 according to the fourth embodiment, the unlocked portion 333 of the lock member 330 is exposed to the outside (upward) and can be easily visually recognized. Thereby, it can be determined at a glance whether or not it is locked.For example, even if there is a problem with the lock member 330 due to some factor, and a state where it is not locked in a situation where it should be locked occurs, A defect can be determined by visual observation without performing an operation such as checking by pressing the shutter member.

  In addition, in the bus duct plug-in hole protection structure 300 of the fourth embodiment, the unlocked portion 333 of the lock member 330 is disposed outside (above) the first shutter member 313a and the second shutter member 313b. Yes. Accordingly, when it is desired to open the shutter member for maintenance or the like while having a lock function, the lock can be easily released by directly operating the unlocked portion 333 and the shutter member can be opened.

  Further, in the bus duct plug-in hole protection structure 300 according to the fourth embodiment, the unlocked portion 333 of the lock member 330 is disposed inside the region of the plug-in hole 12 in a plan view of the plug-in hole 12. For this reason, the space required for providing the bus duct plug-in hole protection structure 300 is reduced as compared with the case where the unlocked portion 333 is arranged outside the plug-in hole region in the plan view of the plug-in hole 12. As a result, the bus duct plug-in hole protection structure becomes compact.

  Further, in the bus duct plug-in hole protection structure 300 according to the fourth embodiment, the plug-in device 320 is provided with the branch contact 21 and the insulation holder 23 of the contact 21, and both side walls 23 b of the insulation holder 23. The lower end portion 23d on the side has a function of an unlocking portion, and the lower end portions 23g on the front wall 23e side and the rear wall 23f side of the insulating holder 23 have a function of a shutter opening portion. For this reason, it is not necessary to form the unlocking portion and the shutter opening portion as separate members or shapes, so that the structure is simple and the manufacturing cost is reduced.

  Hereinafter, the operation of the shutter member 313 and the lock member 330 when the plug-in device 320 is inserted into the plug-in hole 12 in the bus duct plug-in hole protection structure 300 of the fourth embodiment will be described with reference to FIG.

  FIGS. 13A and 13B are views showing a state before the plug-in device 320 is inserted into the plug-in hole 12 of the bus duct 10, and the lower end 23 d of the insulating holder 23 on the side walls 23 b side. The plug-in devices 320 are arranged so that each is positioned almost immediately above the unlocked portion 333.

  FIG. 13C shows that as a result of starting the operation of inserting the plug-in device 320 into the plug-in hole 12, the lower end portions 23d (unlocking portions) on the side walls 23b side of the insulating holder 23 are unlocked. FIG. 6 is a view showing a state in which the entire lock member 330 is bent toward the frame body 313h by being pressed by the portion 333 and is housed in the lock member housing space 340, and is disposed below the first shutter member 313a and the second shutter member 313b. The lock portion 332 that has been moved also moves to the frame body 313h side with the deformation of the lock member 330, and the lock is released.

  In FIG. 13D, the operation of inserting the plug-in device 320 into the plug-in hole 12 causes the lower end 23g (shutter opening portion) on the front wall 23e side and the rear wall 23f side of the insulating holder 23 to be first. FIG. 5 is a diagram illustrating a state in which the operation of inserting the plug-in device 320 into the plug-in hole 12 is completed by pressing and rotating the closing portions 313c of the shutter member 313a and the second shutter member 313b to release the plug member. An insulating holder 23 and a contact 21 protected by the insulating holder 23 are inserted into the plug-in hole 12. As a result, each clip-shaped contact 21 sandwiches the corresponding bus duct conductor 2, and electrical connection between the bus duct 10 and the plug-in device 320 is achieved.

  As described above, the bus duct plug-in hole protection structure 300 according to the fourth embodiment is configured as shown in FIGS. 13B to 13D by inserting the plug-in device 320 into the plug-in hole 12 of the bus duct 10. In addition, the first shutter member 313a and the second shutter member 313b are automatically released while the first shutter member 313a and the second shutter member 313b are automatically unlocked.

  In the bus duct plug-in hole protection structure 300 according to the fourth embodiment, regarding the operation of the shutter member 313 when the plug-in device 320 is pulled out from the plug-in hole 12, the first shutter member 313a and the second shutter member 313b are springs. Since the plug 316 is always biased by the member 316 in the closing direction of the plug-in hole 12, the operation is simply the reverse of the insertion, and the first shutter as shown in FIGS. 13 (d) → (c) → (b). After the member 313a and the second shutter member 313b are automatically closed, the lock member 330 is automatically locked by returning to the original position by elastic force.

  As described above, the bus duct plug-in hole protection structure 300 according to the fourth embodiment is locked when the operator inadvertently touches the shutter member 313, for example, so that the shutter member opens. No, the protection of the plug-in hole 12 becomes even stronger. On the other hand, when the plug-in device 320 is inserted close to the plug-in hole 12, the shutter member 313 is automatically unlocked, so that smooth insertion is possible without affecting the workability. .

  Further, the bus duct plug-in hole protection structure 300 of the fourth embodiment has an advantage that the frame body 313h and the lock member 330 are integrally formed, so that the structure is simple and can be easily formed.

  In the first to fourth embodiments described above, the configuration in which the shutter member is provided for the bus duct 10 having the air-insulated bus duct conductor 2 insulated by the air layer has been described, but the present invention is not limited thereto. In addition, a shutter member may be provided for an insulated bus duct in which each conductor is covered with an insulator and closely arranged. Hereinafter, a case where a shutter member is provided for an insulated bus duct will be described as a fifth embodiment.

<< 5th Embodiment >>
Next, a bus duct plug-in hole protection structure 400 according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a view showing a bus duct having a bus duct plug-in hole protection structure according to a fifth embodiment of the present invention, wherein (a) is a plan view and (b) is a side view. FIGS. 15A and 15B are diagrams showing details of the bus duct plug-in hole protection structure and the bus duct according to the fifth embodiment of the present invention, wherein FIG. 15A is a plan view and FIG. 15B is a schematic cross-sectional view of KK. (C) is a schematic cross-sectional view of L-L. FIG. 16 is a schematic view showing a process of inserting the plug-in device into the plug-in hole of the bus duct plug-in hole protection structure according to the fifth embodiment of the present invention. FIG. ) Is an enlarged view of the instruction circle S4 (before insertion), (c) is an enlarged view of the instruction circle S4 (unlocked state), and (d) is an enlarged view of the instruction circle S4 (after insertion).

  The bus duct plug-in hole protection structure 400 according to the fifth embodiment is different from the first to fourth embodiments in the structure of the bus duct and the shutter member. Therefore, in the fifth embodiment, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first to fourth embodiments, and the first to fourth embodiments. The parts different from the above (that is, the bus duct and the shutter member) will be described in detail, and the description of the parts having the same configuration will be omitted.

  The bus duct plug-in hole protection structure 400 according to the fifth embodiment includes, for example, a plurality of insulating coating types (in this case, three RSTs for three phases) that are covered with an insulating resin sheet (not shown) and arranged in close contact with each other. A bus duct 410 accommodating the bus duct conductor 402 inside the housing 411, a bus duct connecting portion 419 for electrically connecting the bus ducts 410 (that is, a bus duct for connection), and a plurality of bus duct conductors 402 corresponding to the respective bus duct conductors 402 of the bus duct 410 ( In this case, a plug-in device 420 having three contacts 421 as an example is provided (see FIG. 16).

  In the bus duct connecting portion 419, as shown in FIG. 15, the end portions of the bus duct conductor 402 of each phase of the bus duct 410 arranged to face each other are sandwiched between two connecting conductors 419a, and side plates 419b as housings are provided on both outer sides. The bus ducts 410 are electrically connected to each other by being arranged, insulated from each other and between the side plates 419b by an insulating separator 419e, and fastened together by a bolt 419c. At this time, since the two connection conductors 419a are formed wider than the bus duct conductor 402, the two connection conductors 419a protrude upward (downward) from the bus duct conductor 402 when fastened with the bolts 419c. In the portion, a plug-in space 419d sandwiched between two connection conductors 419a is formed.

  Further, the upper and lower portions of the bus duct connecting portion 419 are covered with upper and lower plates 419f as housings, and plug-in holes 12 are formed on the upper and lower plates, and a shutter member 413 is attached thereto (in this case, as an example) Formed only on the upper side). Then, when the contact 421 of the plug-in device 420 is inserted into the plug-in hole 12 via the shutter member 413 and is inserted into the plug-in space 419d (plug-in), it is connected to the connection conductor 419a. The plug-in device 420 is electrically connected to the bus duct 410 as the main trunk of the electric trunk line.

  First, the shutter member 413 in the bus duct plug-in hole protection structure 400 of the fifth embodiment will be described. As shown in FIG. 15, the shutter member 413 includes a pair of first shutter member 413 a and second shutter member that are arranged to face each other as if the plug-in hole 12 is divided into two in the longitudinal direction of the bus duct 410. The first shutter member 413a and the second shutter member 413b are each formed with a closing portion 413c for covering the plug-in hole 12. In addition, on both sides of the bus duct 410 in the longitudinal direction of the frame body 413h of the shutter member 413, there are slide holes 413d in the frame body 413h that can be accommodated by sliding the closing portions 413c of the first shutter member 413a and the second shutter member 413b. It is drilled in the enclosed inner area. The region surrounded by the frame body 413h is also referred to as a plug-in hole 12 for convenience.

  Therefore, by inserting the closing portions 413c of the first shutter member 413a and the second shutter member 413b into the slide holes 413d, the first shutter member 413a and the second shutter member 413b open the plug-in hole 12 in a double-open manner. The slide can be opened and closed.

  In addition, the first shutter member 413a and the second shutter member 413b have at least a part of the end sides of the closing portion 413c that contact each other when the plug-in hole 12 is closed, from the outside of the plug-in hole 12 to the inside. A shutter opening guide portion 413e that is inclined toward the surface is provided. A contact 421 (shutter opening portion) of the plug-in device 420 described later is pressed against the shutter opening guide portion 413e, so that the movement in the direction in which the plug-in device 420 is inserted changes the first shutter member 413a and the second shutter member 413a. The shutter member 413b is converted into a movement that slides in the opening direction.

  In the slide hole 413d, for example, a spiral (coil) spring member 416 for biasing the first shutter member 413a and the second shutter member 413b in a direction to close the plug-in hole 12 is provided. Accordingly, the first shutter member 413a and the second shutter member 413b are urged to close the plug-in hole 12.

  Next, a lock mechanism for the shutter member 413 in the bus duct plug-in hole protection structure 400 of the fifth embodiment will be described. This lock mechanism can be opened when the lock is released while the first shutter member 413a and the second shutter member 413b are not slid to open in the locked state to keep the plug-in hole 12 open. 15 and 16, as shown in FIGS. 15 and 16, in the vicinity of the end of the portion where the first shutter member 413a and the second shutter member 413b are in a closed state, the lock member 430 is attached to the frame body 413h. It implement | achieves by providing integrally so that it may extend from.

  Specifically, the lock member 430 is extended with a strength that can be elastically deformed from the lower side to the upper side of the inner wall of the frame 413h, and the first shutter member 413a and the second shutter are provided at the tip thereof. There is provided an unlocked portion 431 disposed above the end of the portion where the member 413b is abutted in the closed state.

  In addition, the lock member 430 has a pair of locks so that the back side portion of the shutter opening guide portion 413e is locked below the closing portion 413c of each of the first shutter member 413a and the second shutter member 413b in the closed state. A portion 432 is provided, and the protruding width of the lock portion 432 toward the first shutter member 413 a and the second shutter member 413 b is formed shorter than the protruding width of the unlocked portion 431.

  The lock part 432 is disposed on the back side of the shutter opening guide part 413e of the first shutter member 413a and the second shutter member 413b in the closed state, thereby locking the opening guide part 413e and locking the first shutter member 413a. The second shutter member 413b is prevented from sliding (ie, locked) by opening the plug-in hole 12. That is, this is a locked state.

  In addition to such a configuration, a lock is provided between the frame member 413h and the lock member 430 in the shutter member 413 so that the lock member 430 can be deformed and warped when the lock member 430 is pushed toward the frame member 413h. A member storage space 440 is formed.

  Accordingly, in the bus duct plug-in hole protection structure 400 according to the fifth embodiment, when the unlocked portion 431 is pushed toward the frame body 413h by a force exceeding the elastic force of the lock member 430, the lock member 430 is deformed and the frame It will be in the state accommodated in the lock member accommodation space 440 while warping to the body 413h side. At this time, the lock portion 432 of the lock member 430 is also warped toward the frame body 413h, so that the lock portion 432 is unlocked, and the first shutter member 413a and the second shutter member 413b can be slid and opened. Has been made. That is, this is the unlocked state.

  As described above, also in the bus duct plug-in hole protection structure 400 of the fifth embodiment, the first shutter member 413a and the second shutter member 413b slide and plug in as in the third and fourth embodiments. The opening and closing of the hole 12 can be locked and released (that is, the lock is turned on / off).

  Next, the lock release mechanism in the bus duct plug-in hole protection structure 400 of the fifth embodiment will be described. Regarding this unlocking mechanism, first, the plug-in device 420 constituting the bus duct plug-in hole protection structure 400 of the fourth embodiment will be described with respect to the parts different from the plug-in devices of the first to fourth embodiments.

  As shown in FIG. 16, the plug-in device 420 includes a box-shaped main body 422 in which a circuit breaker (not shown) is housed and a main body 422 corresponding to each bus duct conductor 402 of the bus duct 410. A plurality of (in this case, three as an example) contactors 421 provided in a projecting manner and an insulating resin-made insulating holder 423 for supporting and protecting the contactors 421 are provided. In the plug-in device 420 in the bus duct plug-in hole protection structure 400 according to the fifth embodiment, the contact 421 functions as an unlocking unit and also functions as a shutter opening unit.

  Specifically, the contacts 421 are arranged side by side so that when viewed along the longitudinal direction of the bus duct 410, the pair of terminals are tapered and the vicinity of the center bulges outward. The pair of terminals is formed as an insertion guide 421a so that the contact 421 can be easily inserted into the plug-in space 419d between the two connection conductors 419a. Of the insertion guides 421a of the three contact elements 421 arranged side by side, the insertion guides 421a located on both outer sides function as a lock release portion.

  Further, when the contact 421 is viewed along a direction orthogonal to the longitudinal direction of the bus duct 410, the terminal is formed in an inverted triangular shape that tapers toward the lower end, and this portion is the shutter opening portion 421b. Function as.

  On the other hand, in the bus duct plug-in hole protection structure 400 of the fifth embodiment, the unlocked portion 431 of the lock member 430 is formed with a hypotenuse that slopes downward from above at the end thereof.

  When the insertion guide 421a (lock release portion) of the contact 421 of the plug-in device 420 is pressed against the unlocked portion 431 in the insertion direction of the plug-in device 420, the operation in the direction of inserting the plug-in device 420 is performed. Is converted into an operation of pressing the unlocked portion 431 toward the frame body 413h, whereby the lock member 430 is deformed and warped toward the frame body 413h and accommodated in the lock member storage space 440. At this time, the lock portion 432 of the lock member 430 is also warped toward the frame body 413h, so that the lock portion 432 is disengaged, and as a result, the lock is released.

  Thus, in the bus duct plug-in hole protection structure 400 according to the fifth embodiment, the lock of the first shutter member 413a and the second shutter member 413b is released by inserting the plug-in device 420.

  That is, in the bus duct plug-in hole protection structure 400 of the fifth embodiment, the lock member 430 is provided to prevent the first shutter member 413a and the second shutter member 413b from opening, while the plug to the plug-in hole 12 is plugged. The lock by the lock member 430 can be released in accordance with the insertion operation of the in-device 420. As a result, for example, when an operator inadvertently touches the shutter member 413, the first shutter member 413a and the second shutter member 413b are not opened because they are locked, and the plug-in hole 12 Protection becomes even stronger. On the other hand, when the plug-in device 420 is inserted close to the plug-in hole 12, the first shutter member 413a and the second shutter member 413b are automatically unlocked without affecting the workability. Smooth insertion is possible.

  In the bus duct plug-in hole protection structure 400 of the fifth embodiment, the unlocked portion 431 of the lock member 430 is exposed to the outside (upward) so that it can be easily seen. As a result, it can be determined at a glance whether or not it is locked.For example, even if there is a problem with the lock member 430 due to some factor, and a state where the lock member 430 is not locked in a situation where it should be locked occurs, A defect can be determined by visual observation without performing an operation such as checking by pressing the shutter member.

  In addition, in the bus duct plug-in hole protection structure 400 of the fifth embodiment, the unlocked portion 431 of the lock member 430 is disposed outside (above) the first shutter member 413a and the second shutter member 413b. Yes. Accordingly, when it is desired to open the shutter member for maintenance or the like while having a lock function, the lock can be easily released by directly operating the unlocked portion 431 and the shutter member can be opened.

  Further, in the bus duct plug-in hole protection structure 400 according to the fifth embodiment, the unlocked portion 431 of the lock member 430 is disposed inside the region of the plug-in hole 12 in the plan view of the plug-in hole 12. For this reason, the space required for providing the bus duct plug-in hole protection structure 400 is reduced as compared with the case where the unlocked portion 431 is disposed outside the plug-in hole region in plan view of the plug-in hole 12. As a result, the bus duct plug-in hole protection structure becomes compact.

  Further, in the bus duct plug-in hole protection structure 400 according to the fifth embodiment, the plug-in device 420 is provided with a branching contact 421, and the insertion guide 421a of the contact 421 has a function of an unlocking portion. In addition, the shutter opening portion 421b of the contact 421 has a function of a shutter opening portion. For this reason, it is not necessary to form the unlocking portion and the shutter opening portion as separate members or shapes, so that the structure is simple and the manufacturing cost is reduced.

  In addition to this configuration, in the bus duct plug-in hole protection structure 400 of the fifth embodiment, the insulating holder 423 that protects the branching contact 421 in the plug-in device 420 also has a first oblique side 423a that functions as an unlocking portion. A second oblique side 423b that functions as a shutter opening portion is formed. That is, in the bus duct plug-in hole protection structure 400 of the fifth embodiment, both the contact 421 and the insulating holder 423 of the plug-in device 420 have a function of an unlocking part and a function of a shutter opening part. It has also been made. Note that by selecting the shapes and dimensions of the contact 421 and the insulating holder 423, at least one of the function of the unlocking portion and the function of the shutter opening portion may be given only to the contact 421.

  Hereinafter, the operation of the shutter member 413 and the lock member 430 when the plug-in device 420 is inserted into the plug-in hole 12 in the bus duct plug-in hole protection structure 400 of the fifth embodiment will be described with reference to FIG.

  FIGS. 16A and 16B are views showing a state before the plug-in device 420 is inserted into the plug-in hole 12, and both outer sides of the insertion guides 421a of the three contact elements 421 arranged side by side. The plug-in device 420 is arranged so that the insertion guide 421a (unlocking part) located at the position is located almost directly above the unlocked part 431.

  FIG. 16C shows the insertion guides 421a located on both outer sides of the insertion guides 421a of the three contacts 421 arranged as a result of the operation of inserting the plug-in device 420 into the plug-in hole 12 being started. Each of the drawings shows a state in which the unlocked portion 431 is pressed and the entire lock member 430 is bent toward the frame body 413h and accommodated in the lock member storage space 440. The lock portion 432 of the lock member 430 is also the frame body 413h. By warping to the side, the locking by the lock portion 432 is released and the lock is released, and the first shutter member 413a and the second shutter member 413b can be slid and opened.

  FIG. 16D is a diagram illustrating a state in which the operation of inserting the plug-in device 420 into the plug-in hole 12 is completed, and the tip of the substantially triangular shutter opening 421b of the contact 421 is the first shutter. The shutter opening guide portion 413e of the member 413a and the shutter opening guide portion 413e of the second shutter member 413b are in contact with each other, and the first shutter member 413a and the second shutter member 413b are slid in a direction away from each other. That is, when the substantially triangular shutter opening portion 421b is pressed against the shutter opening guide portion 413e, the operation in the direction in which the plug-in device 420 is inserted opens the first shutter member 413a and the second shutter member 413b. The plug-in hole 12 is opened when the force exceeds the urging force of the spring member 416.

  As described above, the bus duct plug-in hole protection structure 400 according to the fifth embodiment is configured so that the plug-in device 420 is inserted into the plug-in hole 12 of the bus duct 410 (bus duct connection portion 419) as shown in FIG. → As shown in (d), the first shutter member 413a and the second shutter member 413b are automatically opened while the first shutter member 413a and the second shutter member 413b are automatically unlocked. Yes.

  In the bus duct plug-in hole protection structure 400 according to the fifth embodiment, regarding the operation of the shutter member 413 when the plug-in device 420 is pulled out from the plug-in hole 12, the first shutter member 413a and the second shutter member 413b are springs. Since the member 416 always urges the plug-in hole 12 in the closing direction, the operation is simply the reverse of the insertion, and the first shutter as shown in FIGS. 16 (d) → (c) → (b). After the member 413a and the second shutter member 413b are automatically closed, the lock member 430 is automatically locked by returning to the original position by elastic force.

  As described above, the bus duct plug-in hole protection structure 400 of the fifth embodiment automatically releases the lock of the shutter member 413 when the plug-in device 420 is inserted close to the plug-in hole 12. Smooth insertion is possible without affecting the workability. On the other hand, for example, when an operator inadvertently touches the shutter member 413, the shutter member does not open because it is locked, and the plug-in hole 12 is further protected. Become.

<< Other embodiments >>
In the embodiment described above, a bus duct having four bus duct conductors (three-phase four-wire) of RST three-phase + neutral phase and three bus duct conductors (three-phase three-wire) having only RST three-phase is described. However, the present invention is not limited to this, and the number of phases of the bus duct conductor and the number of conductors are appropriate, such as single-phase one-wire, single-phase two-wire, single-phase three-wire, three-phase six-wire, three-phase eight-wire, etc. Shall.

  In the first to fourth embodiments described above, the reinforcing portion 14 of the housing 11 is applied as the protruding portion, and the reinforcing space 15 (15a, 15b, 15c) of the housing 11 is applied as the protruding space. Although described above, this invention is not restricted to this, For example, you may make it use the protrusion part and protrusion space which are not a reinforcement use, such as a recessed part for designs or a member set.

  In the first and second embodiments described above, the case where the reinforcing portion 14 and the reinforcing space 15 are formed on both side walls of the upper housing half 11a and the lower housing half 11b has been described. However, the present invention is not limited to this, and the reinforcing plate and the reinforcing space may be formed by projecting and deforming the upper plate of the upper housing half 11a and the lower plate of the lower housing half 11b into a substantially convex shape. The shutter member may be arranged so that a part of the shutter member or the spring member is accommodated in the reinforcing space formed as described above.

  In the first and second embodiments described above, a part of the member related to closing the plug-in hole 12 with respect to the reinforcing space 15a among the reinforcing space 15a, the reinforcing space 15b, and the reinforcing space 15c is disposed. Although the case where it did in this way was described, this invention is not restricted to this, The structure using the reinforcement space 15b and the reinforcement space 15c may be sufficient. Moreover, although the case where the spring member and the restricting portion are provided in the reinforcing spaces 15a on the both side walls of the housing 11 has been described, it may be provided only on one side. Further, a spring member may be provided on one side and a restricting portion may be provided on the other side.

  In the first and second embodiments described above, a part of the shutter member 13, the spring member 16 (116), and the restricting portion 17 are housed in the reinforcing space 15 a as members involved in closing the plug-in hole 12. Although the case where it did so was described, the whole may be accommodated, a part may be accommodated, and only one of the members may be accommodated. In short, the plug-in hole 12 is closed. If a part of the members involved in the operation is accommodated in the reinforcing space 15a (projecting space), it is difficult to hinder the space insulation distance, the creepage distance, and the like between the bus duct conductor 2 and the housing 11.

  In the first to fifth embodiments described above, the case where a spiral (coil) -like spring member or a plate-like spring member is used has been described. However, the present invention is not limited thereto, and the spring member may be used as a spring member. An elastic member may be used, and any material such as a metal material, a rubber-like substance, a soft resin, a plant material product such as a piece of wood or bamboo, and a processed product thereof may be used. Also, there is no particular limitation on the portion connecting the spring member and the shutter member and the structure thereof.

  In the first to fifth embodiments described above, the case where the first shutter member and the second shutter member are brought into contact with each other in the vicinity of the approximate center of the plug-in hole 12 has been described. Not limited to this, the portion where the first shutter member and the second shutter member are abutted may be biased to either the first shutter member or the second shutter member.

  In the first to fifth embodiments described above, the case of using a box-shaped plug-in device in which a circuit breaker and the like are housed is described. However, the present invention is not limited to this, and the plug-in device The shape is not particularly limited, and a circuit breaker or the like may not be provided inside.

  In the first to third embodiments described above, the case where the first shutter member and the second shutter member are opened by the substantially triangular shutter opening portion is described. However, the present invention is not limited to this. Any shape that does not catch on the first shutter member and the second shutter member at the time of insertion, such as a tapered trapezoidal shape or an arc shape below, may be used.

  In the first and second embodiments described above, as shown in FIGS. 4 and 6, the first shutter member 13 a and the second shutter are more inclined than the angle of the oblique side of the substantially triangular opening piece 24 a of the shutter opening portion 24. Although the case where the inclination angle of the shutter opening guide portion 13e of the member 13b is steeper has been described, the present invention is not limited to this, and the angle of the oblique side of the opening piece 24a may be steeper, You may make it match an angle. That is, when the inclination angle of the shutter opening guide portion 13e is steeper than the angle of the oblique side of the opening piece 24a, there is an advantage that the first shutter member 13a and the second shutter member 13b can be opened with a small insertion amount. is there. Further, when the angle of the oblique side of the opening piece 24a is made steeper than the inclination angle of the shutter opening guide portion 13e, there is an advantage that the first shutter member 13a and the second shutter member 13b can be opened with less force. Further, when the angle of the oblique side of the opening piece 24a and the inclination angle of the shutter opening guide part 13e are matched, the shutter opening guide part 13e can be pressed by the entire oblique side of the opening piece 24a, so that the insertion force is stabilized and There is an advantage that it is transmitted to the first shutter member 13a and the second shutter member 13b.

  In the third to fifth embodiments described above, the case where the shutter member unitized as a frame is attached to the plug-in hole 12 formed in the housing of the bus duct and the bus duct connecting portion has been described. The present invention is not limited to this, and a shutter member may be embedded inside the housing without providing a frame as in the first and second embodiments. Similarly, the shutter members of the first and second embodiments may be provided outside the housing by providing a frame like the shutter members of the third to fifth embodiments.

  Further, in the third embodiment described above, the release piece 61 and the release piece 62 of the lock release portion 60 are substantially triangular, and the protruding portion 33 of the lock base 31 of the lock member 30 is rectangular in a cross-sectional view. However, the present invention is not limited to this, and the release piece 61 and the release piece 62 may be rectangular, and the protruding portion 33 may have a substantially triangular shape in a cross-sectional view, or the release piece 61 and the release piece 62. May remain in a substantially triangular shape, and the protruding portion 33 may have a substantially triangular shape or the like in a cross-sectional view. In short, if the movement in the direction in which the plug-in device 220 is inserted can be converted into the movement in the direction in which the lock member 30 is pressed toward the frame body 213h, the shape of each part of the lock release portion 60 and the lock member 30 is It can be selected as appropriate. The same applies to the relationship between the shutter opening guide portion and the shutter opening portion and the relationship between the unlocked portion and the unlocking portion in the first to fifth embodiments.

  In the third embodiment described above, the case where the slit 213s is formed at the end of the portion where the first shutter member 213a and the second shutter member 213b face each other in the closed state has been described. A blocking sheet made of a soft resin may be installed on at least one back side of the first shutter member 213a and the second shutter member 213b so that 213s can be closed from the back side. By doing so, when the first shutter member 213a and the second shutter member 213b are closed, the slit 213s is also closed by the closing sheet, and the safety can be improved. On the other hand, the unlocking portion 60 of the plug-in device 220 can be improved. Is inserted into the slit 213s, the closing sheet is deformed and can be easily passed through the unlocking portion 60, and workability can be ensured.

  In the third embodiment described above, both corners of the edge of the first shutter member 213a facing the second shutter member 213b are cut out into a rectangular shape, and the end of the second shutter member 213b facing the first shutter member 213a. Although the case where the slits 213s are formed by cutting both corners into a rectangular shape and the cutouts are combined with each other has been described, the present invention is not limited thereto, and the first shutter member 213a and the second shutter are formed. A slit may be formed by cutting out only one of the members 213b, or a slit as a minute gap may be formed by slightly separating the first shutter member 213a and the second shutter member 213b in the closed state. You may make it form. In addition, the slit may be formed by slightly notching the inner part of the frame body 213h adjacent to the end of the part where the first shutter member 213a and the second shutter member 213b are brought together.

  In the third embodiment described above, the case where the upper surface of the lock head 32 of the lock member 30 is exposed from the upper surface side opening 44 of the lock member storage portion 40 to the outside (upward) has been described. The present invention is not limited to this. For example, the upper surface side opening 44 may not be provided so that the upper surface of the lock head 32 is not exposed to the outside. By doing so, although it becomes impossible to determine at a glance whether or not it is locked, it is possible to reduce the portion that may directly touch the lock member 30 from the outside, thus improving the safety accordingly. be able to.

  In the third to fifth embodiments described above, the case where the unlocked portion of the lock member is arranged inside the region of the plug-in hole 12 in the plan view of the plug-in hole 12 has been described. The present invention is not limited to this, and the structure is not particularly limited as long as at least a part of the unlocked portion is disposed inside the region of the plug-in hole 12.

  In the above-described fourth embodiment, the case where the protruding width of the lock portion 332 toward the first shutter member 313a and the second shutter member 313b is formed to be shorter than the protruding width of the locking portion 331 has been described. However, the present invention is not limited to this, and the protrusion width of the lock portion 332 and the lock portion 332 are determined so long as the lock portion 332 is unlocked when the locking portion 331 is pushed away by the insulating holder 23. The protrusion width of the locking portion 331 may be the same width or may be longer, and can be set as appropriate. The same applies to the fifth embodiment.

  Further, in the above-described fourth embodiment, the lower end portion 23d on the both side walls 23b side of the insulating holder 23 has a function of an unlocking portion, and the front wall 23e side and the rear wall 23f side of the insulating holder 23 are also provided. Although the case where the lower end portion 23g has the function of the shutter opening portion has been described, the present invention is not limited to this, while the lower end portion 23d on the both side walls 23b side of the insulating holder 23 has the function of the unlocking portion. The shutter release portion may be provided as a separate member, or the lower end portion 23g on the front wall 23e side and the rear wall 23f side of the insulating holder 23 functions as a shutter release portion, while the lock release portion is provided as a separate member. You may do it. In short, the insulating holder 23 only needs to have at least one of the function of the unlocking part and the function of the shutter releasing part.

  Further, in the fifth embodiment described above, the insertion guide 421a of the contact 421 has a function of the unlocking portion, and the shutter opening portion 421b of the contact 421 has the function of the shutter opening portion. Although the present invention is not limited to this, the insertion guide 421a of the contact 421 may function as an unlocking portion while the shutter release portion may be provided as a separate member. While the shutter opening portion 421b functions as a shutter opening portion, the unlocking portion may be provided as a separate member. In short, the contactor 421 may have at least one of the function of the unlocking part and the function of the shutter releasing part.

  In the third embodiment described above, the case where the lock release guide portion 213k inclined toward the slit 213s is formed in the first shutter member 213a and the second shutter member 213b has been described. Not limited to this, the frame body 213h may be formed. That is, if the unlocking guide part 213k is formed around the slit 213s into which the unlocking part 60 is inserted, the position with respect to the plug-in hole 12 when the plug-in device 220 is inserted, that is, the unlocking part 60 with respect to the slit 213s. Even if the position is slightly shifted, the position of the unlocking portion 60 is corrected by the guide 213k, so that it can be inserted smoothly.

  In the third embodiment described above, by providing the shutter locking portion 213j, the first shutter member 213a and the second shutter member 213b are opened toward the outer side of the housing 11 rather than the plug-in hole 12 being closed. However, the present invention is not limited to this, and the first shutter member 213a and the second shutter member 213b are butted against each other so that the urging force is eliminated at the position where the plug-in hole 12 is closed. If the spring member 216 is installed, the first shutter member 213a and the second shutter member 213b can freely open in the outward direction of the housing 11 beyond the frame 213h without providing the shutter locking portion. Can be prevented.

  In the first to fifth embodiments described above, the case where the plug-in hole 12 is closed by the first shutter member and the second shutter member has been described. However, the present invention is not limited to this and the plug-in hole 12 is not limited thereto. The hole 12 may be closed with a single shutter member (that is, only the first shutter member). Hereinafter, as a specific example, the case where the plug-in hole 12 is closed by a single first shutter member in the bus duct plug-in hole protection structure 1 of the first embodiment will be described as the bus duct plug-in hole protection structure 500 of Modification 1. To do.

  As shown in FIGS. 17 and 18, the bus duct plug-in hole protection structure 500 of Modification 1 is different from the bus duct plug-in hole protection structure 1 of the first embodiment in the structure of the shutter member. Therefore, in this modification 1, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first embodiment, and only the portions that are different from the first embodiment are described in detail. The description of the configuration part is omitted.

  In the bus duct plug-in hole protection structure 500 according to the first modification, only the first shutter member 513a is provided in the shutter member 513, and the first shutter member 513a is large enough to close the plug-in hole 12. The closed portion 513c is provided.

  Further, in the bus duct plug-in hole protection structure 500 according to the first modification, the spring member 16 is disposed at a position opposite to the spring locking portion 13f of the first shutter member 513a with respect to the plug-in hole 12 in the reinforcing space 15a. A substantially L-shaped spring locking member 590 is provided in a sectional view for locking. The spring member 16 is locked so as to connect the spring locking portion 13f of the first shutter member 513a and the spring locking member 590.

  In the reinforcing space 15a, a restricting portion 17 is provided between the spring locking member 590 and the first shutter member 513a, whereby the first shutter member 513a is urged by the spring member 16. The spring locking member 590 is prevented from sliding too much.

  Further, in the bus duct plug-in hole protection structure 500 of the first modification, the shape of the opening piece 524a of the shutter opening portion 524 of the plug-in device 20 is a substantially right-angled asymmetrical right triangle shape. This is different from the bus duct plug-in hole protection structure 1 of the first embodiment having the shape of the shutter opening piece 24a.

  As a result, the bus duct plug-in hole protection structure 500 according to the first modification operates in the same manner as the bus duct plug-in hole protection structure 1 according to the first embodiment, although there is a difference that it is a single-open slide type with only the first shutter member. Has been made to be able to.

  Hereinafter, the operation of the first shutter member 513a when the plug-in device 20 is inserted into the plug-in hole 12 in the bus duct plug-in hole protection structure 500 of Modification 1 will be described with reference to FIG.

  FIG. 18A is a diagram showing a state before the plug-in device 20 is inserted into the plug-in hole 12 of the bus duct 10, and the tip of the substantially right triangular triangular opening piece 524 a of the shutter opening portion 524 is The plug-in device 20 is disposed so as to be positioned substantially immediately above a portion where the shutter opening guide portion 513e of the first shutter member 513a and the hole edge 512a of the plug-in hole 12 are in contact with each other. In this case, the hole edge 512a can also function as a restricting portion of the first shutter member 513a. That is, the hole edge 512a may be expanded in the width direction of the bus duct 10.

  FIG. 18B is a diagram showing a state in which the operation of inserting the plug-in device 20 into the plug-in hole 12 is started, and the tip of the opening piece 524a having a substantially right triangle shape of the shutter opening portion 524 is the first. The shutter opening guide portion 513e of the first shutter member 513a and the hole edge 512a of the plug-in hole 12 are in contact with each other, and the first shutter member 513a is slid in a direction away from the hole edge 512a. That is, the operation in the direction of inserting the plug-in device 20 is performed by pressing the oblique side of the substantially right-angled triangular opening piece 524a of the shutter opening portion 524 against the shutter opening guide portion 513e of the first shutter member 513a. 1 is converted into an operation of sliding the shutter member 513a in the opening direction, and when the force exceeds the urging force of the spring member 16, the plug-in hole 12 is opened.

  FIG. 18C is a view showing a state in which the plug-in hole 12 is completely opened. The first shutter member 513a is opened by the substantially right-angled triangular opening piece 524a of the shutter opening portion 524, and the insulating holder 23 A contact (not shown) protected by the insulating holder 23 is inserted into the plug-in hole 12. As a result, the clip-shaped contacts sandwich the corresponding bus duct conductor, and electrical connection between the bus duct 10 and the plug-in device 20 is achieved.

  In this way, the bus duct plug-in hole protection structure 500 according to the first modification is also configured to operate in the same manner as the bus duct plug-in hole protection structure 1 according to the first embodiment. As a result, the same effect can be obtained. .

  In addition, in the bus duct plug-in hole protection structure 500 of the first modification, as shown in FIG. 17, when the shutter opening guide portion 513 e is closed, the first shutter member 513 a is the hole of the plug-in hole 12. It is formed not only in the entire area of the edge that contacts the edge 512a, but only around the area where the open piece 524a having a substantially right triangle shape of the shutter opening 524 contacts. As a result, it is possible to avoid as much as possible the situation where the first shutter member 513a opens due to the operator inadvertently pressing the shutter opening guide portion 513e. The protection of 12 becomes strong.

  In the bus duct plug-in hole protection structure 500 according to the first modification, the spring locking member 590 is also disposed in the reinforcing space 15a as the protruding space. That is, the spring locking member 590 is also a member related to closing the plug-in hole 12 and is disposed in the reinforcing space 15a. Therefore, the bus duct 10 is enlarged to ensure a space insulation distance and a creepage distance. Can be avoided as much as possible.

  In the third to fifth embodiments described above, the case where the shutter member having the frame is attached to the outside of the housing of the bus duct has been described. However, the present invention is not limited to this, and the shutter member is provided inside the housing. May be stored. Hereinafter, as a specific example, a case where a shutter member is housed inside the housing 11 in the bus duct plug-in hole protection structure 200 of the third embodiment will be described as a bus duct plug-in hole protection structure 600 of Modification 2.

  As shown in FIG. 19, the bus duct plug-in hole protection structure 600 of Modification 2 is different from the bus duct plug-in hole protection structure 200 of the third embodiment in that the shutter member is housed inside the housing 11. Therefore, in the second modification, for the sake of convenience of explanation, the same reference numerals are assigned to components that are the same as or correspond to those in the third embodiment, and only the portions that are different from the third embodiment are described in detail. The description of the configuration part is omitted.

  As shown in FIG. 19, the shutter member 613 is a pair of first shutter member 613 a and second shutter member that are arranged to face each other as if the plug-in hole 12 is divided into two in the longitudinal direction of the bus duct 10. 613b, a frame body 613h provided so as to surround the first shutter member 613a and the second shutter member 613b, and an engagement piece 613i extending downward from both ends of the frame body 613h. And is fitted into the plug-in hole 12 from the inside of the upper housing half 11a of the bus duct 10.

  At this time, the height of the engagement piece 613 i is set slightly lower than the height of the reinforcing space 15 a of the housing 11. Thereby, the shutter member 613 is positioned inside the plug-in hole 12 by engaging the engaging pieces 613i at both ends of the frame body 613h over the reinforcing spaces 15a and 15a on both side walls of the housing 11 to be engaged. Easy to install.

  As described above, the shutter member 613 of the bus duct plug-in hole protection structure 600 according to the modified example 2 can be attached to the inside of the housing 11, and there is no difference from the third embodiment except for the above. . As a result, the shutter member 613 of the bus duct plug-in hole protection structure 600 according to Modification 2 can also obtain the same operations and effects as those of the third embodiment described above.

  In addition to such a configuration, in the bus duct plug-in hole protection structure 600 according to the second modified example, as a member related to closing the plug-in hole 12, a lock mechanism (lock member 30, lock member storage portion 40, lock spring member 50) and a shutter are provided. The engaging piece 613i of the member 613 is disposed in a substantially concave reinforcing space 15 (in this case, the reinforcing portion 15a) inside the reinforcing portion 14. For this reason, the member related to closing the plug-in hole 12 without obstructing the space insulation distance, the creepage distance, and the like between the bus duct conductor 2 and the housing 11 housed in the bus duct 10 as much as possible. Can be stored inside. That is, a situation in which the bus duct 10 becomes enormous in order to secure a space insulation distance, a creepage distance, and the like due to the provision of the shutter member 613 inside the housing 11 can be avoided as much as possible.

  In the bus duct plug-in hole protection structure 600 according to the second modification, the lock member 30 is provided at a position where it is not exposed to the outside in plan view. Thereby, although it becomes impossible to determine at a glance whether or not it is locked, it is possible to reduce the parts that may directly touch the lock member 30 from the outside, so that safety can be improved accordingly. it can.

  In the third embodiment described above, the case where the lock member 30 is urged by the plate spring-shaped lock spring member 50 has been described. However, the present invention is not limited to this, and the configuration of the lock member is not limited. The member may be another spring member such as a coil spring. That is, a lock spring 750 having a coil spring shape may be combined with the lock member 730 as shown in FIGS.

  The lock member 730 includes a projecting portion 733 serving as an unlocked portion for receiving a pressure of an unlocking portion (not shown), and a portion projecting from a predetermined position by being urged by the lock spring member 750 when the lock member 730 is set. A locking portion 736 for locking to a frame (not shown) so as not to slide toward the 733 side, and a spring accommodating space 735 for accommodating the lock spring member 750 therein are provided. Since the lock member 730 has the spring accommodating space 735, the lock spring member 750 having a relatively long shape can be attached even in a small space. As a result, the ratio of the change in the length of the lock spring member 750 to the amount of movement of the lock member 730 when unlocked is smaller than when a short spring member is combined with the lock member 730 having no spring accommodating space 735. (Refer to FIG. 21), the rate of change in the biasing force of the spring with respect to the amount of movement is also reduced, and unlocking can be performed smoothly.

  Further, a coil-shaped lock spring member may be combined with the lock member 930 as shown in FIG. In this case, the lock member 930 is protruded from a predetermined position by being urged by a lock spring member when the lock member 930 is set, and a protruding portion 933 as an unlocked portion for receiving a pressure of an unlocking portion (not shown). A long hole 936 into which the projection of the frame body is slidably inserted so as not to slide toward the portion 933 side, and a spring accommodating space 935 in which a lock spring member is accommodated are provided. Since the lock member 930 also has the spring accommodating space 935, the point that the lock spring member having a relatively long shape can be attached even in a small space is the same as the relationship between the lock member 730 and the lock spring member 750 described above.

  Next, a bus duct plug-in hole protection structure 900 using the lock member 930 will be described as a third modification with reference to FIGS. 23 and 24. 23A is an upper perspective view in the shutter closed state, FIG. 23B is a lower perspective view in the shutter closed state, FIG. 23C is an upper perspective view in the shutter open state, and FIG. FIG. 6 is a lower perspective view of the shutter open state. FIG. 24 is a schematic diagram illustrating a process of inserting the plug-in device into the plug-in hole in the third modification, where (a) is a diagram before insertion, and (b) is a diagram during insertion.

  The shutter member of the bus duct plug-in hole protection structure 900 is a unit in which the first shutter member 213a and the second shutter member 213b are attached to the frame body 213h, and the plug-in hole is formed from the outside of the upper housing half 11a of the bus duct 10. 12 is the same as the bus duct plug-in hole protection structure of the third embodiment described above in that it is attached in accordance with 12. Therefore, in this modified example 3, for convenience of explanation, the same reference numerals are given to components that are the same as or equivalent to those in the third embodiment, and different parts from the third embodiment are described in detail, The description of the configuration part is omitted.

  As shown in FIGS. 23B and 23D, each of the first shutter member 213a and the second shutter member 213b is rotatable with respect to a region surrounded by the frame body 213h (that is, the plug-in hole 12). It has a pair of columnar rotation shafts 913i for holding. Further, on the back side of the frame body 213h, a cylindrical rotation hole 913k having a diameter slightly larger than that of the rotation shaft 913i is formed at a position corresponding to the rotation shaft 913i. Accordingly, the first shutter member 213a and the second shutter member 213b are held in a state where the rotation shaft 913i is rotatable in the rotation hole 913k of the frame body 213h, and the plug-in hole 12 can be rotated to open and close. It is made like that.

  The rotating shaft 913i is inserted into a spiral (coil) spring member 916, and one end of the spring member 916 is locked to the back side of the first shutter member 213a and the second shutter member 213b, and the other end thereof. The frame 213h is locked on the back side. As a result, in the bus duct plug-in hole protection structure 900 according to the third modification, each of the first shutter member 213a and the second shutter member 213b is urged so as to rotate from the inside to the outside of the housing 11.

  In addition, the shutter locking portion 213j in the bus duct plug-in hole protection structure 900 extends from the upper end of the inner wall of the frame 213h so as to lock the entire upper portions of the short sides of the first shutter member 213a and the second shutter member 213b. Yes. Thereby, like the shutter latching | locking part 213j of 3rd Embodiment, the 1st shutter member 213a and the 2nd shutter member 213b can open to the outer side direction of the housing 11 rather than the state which obstruct | occluded the plug-in hole 12. FIG. It is made impossible.

  Furthermore, the unlocking guide portion 213k in the bus duct plug-in hole protection structure 900 is formed in the frame body 213h and the shutter locking portion 213j so as to be inclined toward the slit 213s. Thereby, similarly to the unlocking guide part 213k of the third embodiment, even when the position with respect to the plug-in hole 12, that is, the position of the unlocking part 60 with respect to the slit 213s is slightly shifted when the plug-in device 920 is inserted, Since the position of the unlocking portion 60 is corrected by the guide 213k, it can be inserted smoothly.

  Here, in the bus duct plug-in hole protection structure 900 of Modification 3, the lock member 930 performs the same operation as the lock member 30 of the bus duct plug-in hole protection structure 200 of the third embodiment. That is, as shown in FIGS. 22 and 23, the lock member 930 has a projecting portion 933 below the end of the end where the first shutter member 213a and the second shutter member 213b are abutted in the closed state. The first shutter member 213a and the second shutter member 213b are pivoted in the inner direction of the housing 11 to be opened by being biased inward by the lock spring member 950 by the lock spring member 950 ( That is, it is locked (locked state).

  The lock member 930 is inserted into the elongated hole 936 so that the protrusion 213x protruding from the frame 213h is slidable. Therefore, even if the lock member 930 is urged by the lock spring member 950, the lock member 930 is locked to the protrusion 213x. It does not slide to the protruding portion 933 side (inward direction of the plug-in hole 12). Further, the lock member 930 is slid with respect to the frame body 213h so as not to be detached from the frame body 213h by, for example, disposing a holding plate (not shown) as shown in FIG. Held possible.

  Then, as shown in FIGS. 23C and 23D, the lock member 930 moves when the protruding portion 933 is pushed toward the frame body 213h with a force exceeding the urging force of the lock spring member 950, and the first shutter member 213a is moved. The second shutter member 213b can be rotated and opened in the inner direction of the housing 11 (unlocked state).

  On the other hand, a plug-in device 920 in the bus duct plug-in hole protection structure 900 of Modification 3 (here, for convenience of explanation, the main body and contacts are omitted and only the insulating holder 923 is displayed) is shown in FIG. As shown, the plug of the third embodiment is that the first shutter member 213a and the second shutter member 213b are opened after the lock member 930 is automatically unlocked by the lock release member 60 when the plug-in device 920 is inserted. Although the same as the in-device 220, the plug-in according to the third embodiment has a substantially isosceles triangular shutter opening 224 in that the lower end of the insulating holder 923 itself is a substantially rectangular shutter opening. Different from the device 320. That is, in the plug-in device 920 of the third modification, the unlocking member 60 of the plug-in device 220 of the third embodiment is combined with the shutter opening portion (lower end portion 23g) of the plug-in device 320 of the fourth embodiment. Has a structure.

  As a result, in the bus duct plug-in hole protection structure 900 according to the third modified example, when the plug-in device 920 is inserted into the plug-in hole 12, the first shutter member 213a and the second shutter member 213b are not yet opened. By the lower end portion 23g (that is, the shutter opening portion) on the front wall 23e side and the rear wall 23f side of the holder 923, a portion closer to the rotation shaft 913i on the upper surface of the first shutter member 213a and the second shutter member 213b is made vertical or vertical. It will press at a close angle. As a result, the amount of rotation of the first shutter member 213a and the second shutter member 213b in the opening direction with respect to the insertion length of the plug-in device 920 is increased, so that quick opening is possible. Further, when the plug-in device 920 is pulled out from the plug-in hole 12, the operation is reverse to that at the time of insertion. Therefore, the closing direction of the first shutter member 213a and the second shutter member 213b with respect to the pull-out length of the plug-in device 920. The amount of rotation is increased, and quick closure is possible.

  Therefore, in the bus duct plug-in hole protection structure 900 according to the third modification, the moving distance (hereinafter, also referred to as “detaching distance”) of the plug-in device 920 for opening and closing the first shutter member 213a and the second shutter member 213b can be shortened. Thereby, for example, it is possible to reduce the construction space secured in advance around the bus duct in consideration of the attachment / detachment distance of the plug-in device 920. Further, in the bus duct plug-in hole protection structure 900, when the plug-in device 920 is pulled out, the structure is between the first shutter member 213a and the second shutter member 213b being closed and the lock member 930 returning to the locked state. It is possible to provide an appropriate margin (operation timing). Thereby, for example, even when the operator quickly pulls out the plug-in device 920 in the inserted state, the lock member 930 is moved before the first shutter member 213a and the second shutter member 213b are completely returned to the closed position. The situation in which the plug-in device 920 is attached to the plug-in device 920 is extended in such a situation that the lock member 930 obstructs the blocking of the first shutter member 213a and the second shutter member 213b. It is possible to prevent it without fail.

  The insulating holder 923 not only serves to fix a plurality of clip-shaped contacts (not shown) (three phases + neutral phase in the case of FIG. 24), but also a creepage distance for insulating the contacts. In addition, it has a role of securing a space insulation distance, and there is a structural limit in reducing or shortening the structure of the insulation holder 923 itself. That is, if the insulating holder 923 is provided with a tapered shutter opening portion as in the third embodiment described above, the attachment / detachment distance is extended by the taper. Therefore, a structure that does not have (or slightly has) a tapered shutter opening portion like the opening piece 224a of the insulating holder 923 according to the third modification shortens the attachment / detachment distance of the plug-in device 920. The number of effective means is few, and the detachment distance can be further shortened by pressing a portion closer to the rotation shaft 913i on the upper surface of the first shutter member 213a and the second shutter member 213b.

  Further, in the third modification, when the first shutter member 213a and the second shutter member 213b have not yet begun to open, the portion close to the rotation shaft 913i is close to vertical or vertical by the lower end portion 23g (that is, the shutter opening portion). Although the case of pressing at an angle has been described, if the pressing can be performed at an angle close to vertical (for example, 80 ° to 100 °), it is the first shutter member 213a that presses the portion close to the rotation shaft 913i. And the stage after the second shutter member 213b starts to open, and the structure of the shutter opening portion for pressing is not particularly limited (a slight taper may be used, or separately from the insulating holder). May be provided). Further, pressing at a vertical or near-vertical angle means an angle with respect to the entire first shutter member 213a and the second shutter member 213b. For example, a reinforcing rib or the like is provided on the surface (blocking portion 213c). As a result, even if the pressing portion by the shutter opening portion is locally inclined, if the pressing angle with respect to the entire first shutter member 213a and the second shutter member 213b is vertical or nearly perpendicular, An effect is obtained.

  In addition to such a configuration, a barrier 960 is erected around the portion where the lock member 930 is disposed on the back side of the first shutter member 213a and the second shutter member 213b in the locked state. Thereby, in the bus duct plug-in hole protection structure 900, the minute gap formed between the blocking member 213c of the first shutter member 213a and the second shutter member 213b and the lock member 930 can be reliably closed by the barrier 960. Even if there is a case where a tool such as a screwdriver approaches the slit 213s, it is possible to prevent a situation in which the operator enters the housing 11 and touches the internal conductor 2 to cause an electric shock. it can.

  As shown in FIG. 24, the bus duct plug-in hole protection structure 900 of Modification 3 is also locked when the plug-in device 920 is inserted close to the plug-in hole 12 as in the third embodiment. The first shutter member 213a and the second shutter member 213b are automatically opened while the automatic shutter release is performed, and when the plug-in device 920 is pulled out from the plug-in hole 12, the first shutter member is released. The 213a and the second shutter member 213b are automatically closed and locked automatically.

  In the bus duct plug-in hole protection structure 900 according to the modified example 3, the rear wall 23f of the plug-in device 920 is formed with an erroneous insertion prevention notch 923a and a frame corresponding to the erroneous insertion prevention notch 923a at the time of plug-in. An erroneous insertion prevention rib 923b is formed in the body 213h. Thereby, in the bus duct plug-in hole protection structure 900, erroneous insertion when the erroneous insertion prevention notch 923a and the erroneous insertion prevention rib 923b do not coincide with each other at the time of plug-in is prevented.

  As described above, the bus duct plug-in hole protection structure 900 according to the third modification can also obtain the same operations and effects as those of the third and fourth embodiments described above.

  In the first and second embodiments described above, the case where the slide opening / closing type first shutter member and second shutter member are united by connecting them with a spring member has been described. For example, the first shutter member and the second shutter member may be slidably attached to the frame so as to be unitized. Hereinafter, a specific example will be described as Modification 4 shown in FIGS. 25 and 26.

  As shown in FIG. 26, the shutter member 813 in the bus duct plug-in-hole protection structure 800 of Modification 4 has a feature that the first shutter member 13a and the second shutter member 13b are slidably attached to the frame body 813h. It is different from the bus duct plug-in hole protection structure 1 of the first embodiment. Therefore, in this modified example 4, for convenience of explanation, the same reference numerals are given to components that are the same as or correspond to those in the first embodiment, and only the portions that are different from the first embodiment are described in detail. The description of the configuration part is omitted.

  First, slide portions 810 are formed on the first shutter member 13a and the second shutter member 13b so as to partially extend both ends of the closing portion 13c, as shown in FIG. On the other hand, the frame body 813h has a flat plate portion 813p having a length capable of spanning between the reinforcing spaces 15a on both side walls of the housing 11 as a whole, and the flat plate portion 813p has the same size as the plug-in hole 12. And an opening 812 having a shape (hereinafter, the opening 812 may be referred to as a plug-in hole 12 for convenience).

  Further, side walls 813d having a height substantially the same as the height of the reinforcing space 15a of the housing 11 are formed on both ends in the width direction of the flat plate portion 813p. The side wall 813d is provided with a first rail hole 813q that is slidably held through the slide portion 810 of the first shutter member 13a as a long hole that penetrates the side wall 813d, and the second shutter member 13b. The second rail hole 813r that is slidably held through the slide portion 810 is provided as a long hole that penetrates the side wall 813d.

  Thus, the first shutter member 13a is arranged so that the slide portions 810 at both ends of the closing portion 13c are inserted into the first rail holes 813q of the both side walls 813d of the frame body 813h, so that the frame body 813h On the other hand, it is slidably attached. Similarly, the second shutter member 13b is also arranged so that the slide portions 810 at both ends of the closing portion 13c are inserted into the second rail holes 813r of the both side walls 813d of the frame body 813h. On the other hand, it is slidably attached.

  At this time, since the first shutter member 13a and the second shutter member 13b are provided with the shutter opening guide portion 13e, they may enter the first rail hole 813q and the second rail hole 813r up to the closing portion 13c. Only the slide portion 810 is inserted into the first rail hole 813q and the second rail hole 813r, which is regulated by the shutter opening guide portion 13e. As a result, the first shutter member 13a and the second shutter member 13b are held between the side walls 813d of the frame body 813h without being separated from the first rail hole 813q and the second rail hole 813r. .

  Further, the first shutter member 13 a and the second shutter member 13 b are connected to each other by a spiral (coil) spring member 816. Specifically, spring locking portions 813f are provided at positions opposite to the second shutter member 13b side in the slide portions 810 on both sides of the first shutter member 13a, and both sides of the second shutter member 13b. A spring locking portion 813f is provided at a position opposite to the first shutter member 13a side in the slide portion 810. The spring member 816 is locked so as to connect the spring locking portion 813f of the first shutter member 13a and the spring locking portion 813f of the second shutter member 13b.

  Thereby, since the first shutter member 13a and the second shutter member 13b are attracted to each other by the spring member 816, the first shutter member 13a and the second shutter member 13b are urged to approach each other, that is, in a direction to close the opening 812 (plug-in hole 12). It has become so. Further, the first shutter member 13a and the second shutter member 13b are movable only within a range in which the slide portion 810 slides by inserting the slide portion 810 into the first rail hole 813q and the second rail hole 813r. Has been made. That is, the ends of the first rail hole 813q and the second rail hole 813r play the same role as the restricting portion 17 of the first embodiment described above.

  As described above, the shutter member 813 of the modified example 4 is formed, and as shown in FIG. 25, the opening 812 of the frame body 813h is overlapped with the plug-in hole 12 of the housing 11, and the flat plate of the frame body 813h. The portion 813p is arranged so as to span the reinforcing space 15a on both side walls of the housing 11, and is fixed to the housing 11 by screws or the like. As a result, the bus duct plug-in hole protection structure 800 of Modification 3 operates in the same manner as the bus duct plug-in hole protection structure of the first and second embodiments with respect to the attachment / detachment of a plug-in device (not shown), and the same An effect can be obtained.

  In addition, when the shutter member 813 of the modification 4 is attached to the housing 11, the side walls 813d at both ends of the flat plate portion 813p have an internal space of the housing 11 (a space having a substantially rectangular shape in a sectional view) and a reinforcing space 15a. Therefore, even if a situation occurs in which the spring member 816 disposed in the reinforcing space 15a is cut due to some unforeseen circumstances, the cut spring member 816 hangs down and the bus duct conductor 2 and the housing 11 are dropped. It is possible to reliably avoid the occurrence of a situation such as obstructing the space insulation distance or creepage distance between the bus duct conductor 2 and the bus duct conductor 2. That is, the side walls 813d at both ends of the flat plate portion 813p function as a spring movement restricting portion that restricts movement of the spring member 816 arranged in the reinforcing space 15a to the internal space of the housing 11, and if the function can be exhibited, The shape is not limited to the wall, and any member such as a fence-like member, screws and bolts installed at predetermined intervals, and a columnar member arranged along the longitudinal direction of the bus duct may be used.

  As described above, the bus duct plug-in hole protection structure of the present invention has been described based on the respective embodiments and the modified examples. However, the present invention is not limited to the above-described embodiments and modified examples, and the respective embodiments are partially described. It is applicable within the scope of the gist of the present invention. For example, the first shutter member 413a and the second shutter member 413b of the fifth embodiment are connected to each other by the spring member 16 of the first embodiment, so that the first shutter member 413a and the second shutter member 413a of the fifth embodiment are connected to each other. The plug-in hole 12 may be closed with the two shutter members 413b. In addition, the same effect can be obtained even if the lock members provided in two places with respect to the plug-in hole 12 in the third to fifth embodiments and modifications are only on one side. Further, the configuration in which the plug-in hole 12 is closed by the first shutter member and the second shutter member in the third to fifth embodiments and modifications having the lock mechanism is closed only by one shutter member. You may do it. Further, the first shutter member 13a and the second shutter member 13b (open / close member) of the first and second embodiments that open and close in a sliding manner may be configured to rotate and open / close.

  DESCRIPTION OF SYMBOLS 1,100,200,300,400,500,600,800,900 ... Bus duct plug-in-hole protection structure, 2,402 ... Bus duct conductor 10, 410 ... Bus duct, 11, 411 ... Housing, 11a ... Upper housing half 11b ... Lower housing half, 12 ... Plug-in hole, 12a ... Misinsertion prevention notch, 13, 213, 313, 413, 513, 613, 813, 913 ... Shutter member, 13a, 213a, 313a, 413a, 513a , 613a ... first shutter member, 13b, 213b, 313b, 413b, 613b ... second shutter member, 13c, 213c, 313c, 413c, 513c ... closed portion, 13d ... slide portion, 13e, 213e, 413e, 513e ... shutter Opening guide part, 13f... Spring locking part, 14 Reinforcement part, 15, 15a, 15b, 15c ... Reinforcement space, 16, 116, 216, 316, 416 ... Spring member, 17 ... Restriction part, 18 ... Connection member, 18a, 18b ... End part, 20, 220, 320, 420 ... Plug-in device, 21, 421 ... Contact, 22, 422 ... Main body, 23, 423, 923 ... Insulating holder, 23a ... Groove, 23b ... Side wall, 23c ... Incorrect insertion preventing rib, 23d ... Lower end, 23e ... Front wall, 23f ... Rear wall, 23g ... Lower end, 24, 224, 421b, 524 ... Shutter opening, 24a, 224a, 524a ... Open piece, 30, 330, 430, 730, 930 ... Lock member, 31 ... Lock base, 32 ... Lock head, 33, 733, 933 ... Projection part, 40 ... Lock member storage part, 41 ... Front side opening, 42 ... Slide chamber, 43 ... Locking part 43, 4 ... upper surface side opening, 45 ... spring holding chamber, 50, 750 ... lock spring member, 60 ... lock release part, 61, 62 ... release piece, 113f ... spring stop part, 113g ... insertion hole, 213h, 313h, 413h, 613h ... Frame body, 213i ... rotating shaft, 213j ... shutter locking portion, 213k ... unlock guide portion, 213s ... slit, 313m ... conductor holding groove, 331 ... locking portion, 332, 432 ... lock portion, 333, 431 ... Unlocked part, 340, 440 ... Lock member storage space, 413d ... Slide hole, 419 ... Bus duct connection part, 419a ... Connection conductor, 419b ... Side plate, 419c ... Bolt, 419d ... Plug-in space, 419e ... Insulating separator, 419f ... upper and lower plates, 421a ... insertion guide, 423a ... first oblique side, 423b ... second oblique side, 512a ... hole edge, 590 ... Spring locking member, 613i ... Engagement piece, 735, 935 ... Spring accommodating space, 736 ... Locking portion

Claims (10)

In the bus duct plug-in hole protection structure when connecting to a plug-in hole formed in the housing of the bus duct having an electrical trunk line and having at least one conductor while inserting the contact of the plug-in device,
The bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and a lock member that stops the door member from moving in an opening direction.
In response to the operation of bringing the plug-in device closer to the plug-in hole, the plug-in device has a door opening portion that moves the door member in the opening direction, and an operation of bringing the plug-in device closer to the plug-in hole. A lock release unit that moves the lock member to release the locking of the door member by the lock member; and
The bus member is provided with an unlocked portion that receives the pressure of the unlocking portion, and at least a part of the unlocked portion is disposed below the door member. Plug-in hole protection structure. In the bus duct plug-in hole protection structure when connecting to a plug-in hole formed in the housing of the bus duct having an electrical trunk line and having at least one conductor while inserting the contact of the plug-in device,
The bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and a spring member that biases the door member in the closing direction.
The plug-in device is provided with a door opening portion that moves the door member in an opening direction in accordance with the operation of bringing the plug-in device closer to the plug-in hole.
The housing of the bus duct is formed with a protruding portion that protrudes in a substantially convex shape from the inside to the outside of a substantially square-shaped space in a cross-sectional view, so that a substantially concave protruding space is formed inside the protruding portion. A bus duct plug-in hole protection structure, wherein the spring member is disposed in the protruding space. In the bus duct plug-in hole protection structure when connecting to a plug-in hole formed in the housing of the bus duct having an electrical trunk line and having at least one conductor while inserting the contact of the plug-in device,
The bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and the plug-in device opens the door member in an opening direction in accordance with an operation of bringing the plug-in device close to the plug-in hole. A moving door opening is provided,
The door member has a rotation shaft, and when the door opening portion is pressed, the rotation shaft rotates to open the plug-in hole,
The bus duct plug-in hole protection structure, wherein the pivot shaft is disposed above the upper surface of the housing of the bus duct. Claim 3 wherein the door opening portion of the plug-in device, characterized in that pivoting the said door member by pressing a portion close to the rotational axis vertical or nearly vertical angle of the door member Bus duct plug-in hole protection structure as described in 1. In the bus duct plug-in hole protection structure when connecting to a plug-in hole formed in the housing of the bus duct having an electrical trunk line and having at least one conductor while inserting the contact of the plug-in device,
The bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed, and a spring member that biases the door member in the closing direction.
The bus duct plug-in hole protection, wherein the contact of the plug-in device also functions as a door opening part that moves the door member in an opening direction in accordance with an operation of bringing the plug-in device close to the plug-in hole. Construction. In the bus duct plug-in hole protection structure when connecting to a plug-in hole formed in the housing of the bus duct having an electrical trunk line and having at least one conductor while inserting the contact of the plug-in device,
The bus duct is provided with a door member that closes the plug-in hole so that the plug-in hole can be opened and closed by sliding along the longitudinal direction of the conductor of the bus duct.
The plug-in device is provided with a door opening portion that slides the door member in an opening direction in accordance with an operation of bringing the plug-in device closer to the plug-in hole.
The door opening portion has an opening piece that comes into contact with an end portion of the door member when the contact is inserted into the plug-in hole.
The bus duct plug-in-hole protection structure according to claim 1, wherein the oblique side of the open piece abuts obliquely against the end of the door member to slide the door member in the opening direction. The bus duct is provided with a lock member for locking the door member from moving in the opening direction,
The plug-in device is provided with a lock releasing portion that moves the lock member in accordance with an operation of bringing the plug-in device closer to the plug-in hole to release the locking of the door member by the lock member. The bus duct plug-in hole protection structure according to any one of claims 2 to 6 . The lock member is provided with an unlocked portion that receives the pressure of the unlocking portion,
In a state where the door member is closed the plug hole, wherein at least a portion of the releasing member is, claim 1 or characterized in that it is arranged inside the region occupied by the plug-in hole in a plan view bus duct plug-hole protection structure according to 7. The bus duct plug-in hole protection structure according to any one of claims 1, 7, and 8 , wherein the lock member is provided so as not to protrude above the upper surface of the door member. A frame having an opening is provided in the bus duct so that the opening overlaps the plug-in hole;
The door member, by mounted for openably closing the opening relative to the frame, to any one of claims 1 to 9, characterized in that closing the plug-in hole to be opened and closed Bus duct plug-in hole protection structure as described.

Images