JP5219739B2 - Fusible link unit - Google Patents

Description

  The present invention relates to a fusible link unit including a fuse circuit structure in which a plurality of terminal portions and fusible bodies are provided in a chain on a connection plate.

  In recent years, a variety of fusible link units in which a plurality of terminals and fusible members are connected in a chain to a rigid connecting plate called a bus bar to form a fuse circuit component and the fuse circuit component is housed in a housing. Proposed.

  When assembling this fusible link unit, it is necessary to correctly insert the fuse circuit structure into a predetermined position of the circuit structure housing part from the opening of the housing. However, since the circuit structure housing part cannot be easily seen from the outside of the housing, the tip portions of a plurality of terminals constituting the fuse circuit structure are smoothly inserted into the corresponding circuit path structure housing parts. Difficult to do. If this insertion is mistaken, the tip of the terminal is deformed and bent, so that this insertion operation must be repeated.

  Also, in such fusible link units, a fuse that is a fusible element due to an overcurrent supply to the load or a short circuit accident of the load circuit may blow out, and the status of this fuse can be monitored or necessary It is necessary to perform maintenance.

  On the other hand, it is possible to smoothly insert the tip portions of the terminals constituting such a fuse circuit structure into the corresponding circuit structure housing portions, or to change the state of the fusible body (fuse) from the outside of the housing from the outside of the housing. In order to enable monitoring and facilitate maintenance, a fusible link unit has been proposed in which a transparent cover is covered on an opening of a housing that houses a fuse circuit component (see, for example, Patent Document 1).

In this fusible link unit, confirmation of the insertion position of the terminal tip portion with respect to the circuit structure housing portion through the transparent cover, the state of the fuse circuit structure in the housing, particularly whether the fusible portion is blown or not, etc. It can be easily distinguished from the outside.
JP 2004-194432 A

  However, if a transparent cover is used to check the insertion position of the tip of the terminal with respect to the circuit component housing part and the state of the melted part in the housing, the transparent cover is more expensive than an opaque plastic material. Therefore, there is a disadvantage that the cost of the entire fusible link unit is increased.

  The present invention has been made in view of the above-described circumstances. The object of the present invention is to provide a fuse circuit component and the like in the housing even if the cover and the housing are made of an inexpensive material such as an opaque plastic. It is possible to provide a fusible link unit that can be easily observed from outside and can reduce the cost of the entire apparatus.

In order to achieve the above-described object, the fusible link unit according to the present invention is characterized by the following (1) to (4).
(1) a fuse circuit assembly having a connection plate and a plurality of terminal portions connected to the connection plate via a fusible body;
A cylindrical housing for housing the fuse circuit component;
An upper part is formed in a cylindrical shape closed by a top plate, and the top plate includes a cover attached to the housing so as to cover the opening of the housing ,
The side wall of the housing is formed with a housing-side window hole that is perforated from the outside to the inside of the housing,
On the side wall of the cover, a cover side window hole is formed which is drilled from the outside to the inside of the cover.
The cover is displaced relative to the housing so that the housing side window hole and the cover side window hole face each other when mounted on the housing, whereby the housing side window hole and the cover and a state wherein the fusible side window opening is in communication can be perceiving, and a state where the housing-side window opening and the cover-side window opening is blocked, but switched Rukoto.
(2) A fusible link unit configured as described in (1) above,
The cover is provided with a spring that urges the cover in one direction with respect to the housing.
The housing side window hole and the cover side window hole communicate with each other when the cover is displaced with respect to the housing by the repulsive force of the spring.
(3) A fusible link unit configured as described in ( 2 ) above,
The cover is formed with a protrusion whose lower surface is a tapered surface,
While the housing is accommodated in the supply box, by displacing in the direction in which the cover against the repulsive force of the spring by projections provided on the cover comes into contact with the inner surface of the front Stories power box The housing window hole and the cover window hole are closed (4) The fusible link unit having any one of the constitutions (1) to (3),
A protrusion is formed on the side wall of the housing,
The projection provided on the housing engages with the engagement hole provided on the side wall of the cover, whereby the housing window hole and the cover window hole can be held in communication.

According to the fusible link unit of the above (1), the cover side window hole is aligned with the housing side window hole by moving the cover with respect to the housing, and the fuse circuit component inside the housing is passed through each of these window holes. It can be seen from the outside of the housing. Accordingly, it is possible to facilitate the operation of inserting the fuse circuit component into the circuit component housing portion and to confirm whether or not the fusible body (fuse) is blown inside the housing.
On the other hand, the movement of the cover relative to the housing causes the housing side window hole and the cover side window hole to be in an inconsistent state, so that both the window holes are closed, and the fuse circuit structure inside the housing is viewed. In addition, it is possible to prevent moisture and dust from entering from the outside through these window holes, and it is possible to prevent deterioration in performance of electrical and mechanical connections in the terminal portion and the like. Further, since the cover and the housing can be made of an opaque member, it is possible to suppress the cost increase of the entire apparatus.
According to the fusible link unit configured as described in (2) above, the housing side window hole and the cover side window hole can be easily formed by moving the cover with a fingertip or the like in the direction of the repulsive force and the direction against the repulsive force. The fuse circuit component inside the housing can be seen from the outside of the housing during communication, while dust and moisture can be prevented from entering the housing during communication.
According to the fusible link unit having the configuration of (3) above, the housing side window hole and the cover side window hole are not communicated when housed in the power box, and the housing side window hole and cover are removed when taken out from the power box. Since the side window hole can be communicated, the communication between the housing side window hole and the cover side window hole can be switched between communication and non-communication by a simple operation of taking out and housing the fusible link unit .

  According to the fusible link unit of the present invention, even if the cover and the housing are made of an inexpensive material such as opaque plastic, the fuse circuit structure in the housing can be removed from the housing only by a simple moving operation of the cover. Can be easily viewed and confirmed, and the cost of the entire apparatus can be reduced.

DESCRIPTION OF EMBODIMENTS Preferred embodiments according to the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
1 to 6 show a fusible link unit 10 according to a first embodiment of the present invention. The fusible link unit 10 has a housing 11, a fuse circuit structure 12 housed in the housing 11, and an opening of the housing 11 housing the fuse circuit structure 12 so as to cover the opening. And a cover 13 attached so as to be movable (slidable). The fusible link unit 10 can be mounted on a power supply box 24 for a vehicle as shown in FIGS.

  The housing 11 has a cylindrical body having a rectangular cross section as a whole, is formed of an opaque plastic material, and is formed by integrally connecting an upper cylinder portion and a lower cylinder portion slightly smaller than the upper cylinder portion. A step portion 11e and a step portion 11f are respectively formed on the inner side surface and the outer side surface of the portion where the upper tube portion and the lower tube portion are continuous. The step portion 11e is formed in a direction perpendicular to the inner side surface (vertical surface), and the step portion 11f is formed in a direction inclined with respect to the outer side surface (vertical surface).

  The fuse circuit component 12 includes a strip-shaped connecting plate 14 made of a conductive material, a plurality of fusible bodies (fuses) 15 whose one ends are electrically connected to the lower edge of the connecting plate 14, and these fusible bodies 15. And a variety of terminal portions 16 called a female type or a screwing type having a predetermined current capacity corresponding to the load current. The fusible body 15 and the terminal portion 16 are attached to, detached from, or fixedly attached to a circuit component housing portion (not shown) provided in the housing 11. In addition, about these attachment structures, any structure conventionally proposed variously is employable. Each terminal portion 16 can be connected to each terminal portion of the mating connector.

  As shown in FIGS. 1, 2, 3, and 6, a plurality of window holes (housing side window holes) 17 penetrating into and out of the housing 11 are formed in the front wall 11 a and the back wall 11 b of the housing 11. Has been. These window holes 17 are vertically long rectangular holes, and, as will be described later, the fuse circuit component 12 in the housing 11, mainly the fusible body 15, passes through the cover side window hole 23 in the front direction or obliquely laterally outside the housing 11. It is a predetermined size that can be seen from the direction.

  Further, a guide hole 18 is formed in the front wall 11a and the back wall 11b of the housing 11 near the upper center. These guide holes 18 are horizontally long through holes, and function to guide a guide protrusion 19 (described later) provided in the cover 13 so as to be slidable in the lateral direction. Further, the front wall 11a of the housing 11 is formed with a projection 25 that is fitted into an engagement hole 26 of the cover 12 described later in a direction protruding outward from the front wall 11a.

  The cover 13 as a whole forms a rectangular cylinder whose upper part is closed by a top plate 13g, and is formed of an opaque plastic material. The top plate 13g is integrally provided with flanges 13e and 13f protruding in the front-rear direction from the front wall 13a and the back wall 13b of the cover 13. A guide projection 19 is provided near the upper center of the front wall 13a and the back wall 13b and is slid by being inserted into the guide hole 18 formed in the housing 11. Further, the top plate 13g is formed with a protruding portion 27 that protrudes from the end of the top plate 13g in the direction of the front wall 13a and that partially faces the front wall 11a when the cover 13 is attached to the housing 11. ing. The protrusion 27 is formed with an engagement hole 26 into which a protrusion 25 protruding outward from the front wall 11a can be engaged.

  In addition, a plurality of window holes (cover side window holes) 23 penetrating into and out of the cover 13 are formed in the front wall 13a and the back wall 13b of the cover 13. These window holes 23 are vertically long rectangular holes. When the window holes 23 communicate with the window holes 17 on the housing 11 side, the fuse circuit component 12 in the housing 11, particularly the fusible body 15, can be clearly observed from the outside. It is supposed to be a size that can be.

  A protrusion 20 having a predetermined width whose lower surface is a tapered surface P is provided at a portion where the left side wall 13c of the cover 13 and the top plate 13g are continuous. The protrusion 20 is further formed with a protrusion 28 that protrudes toward the front wall 11 a when the cover 13 is attached to the housing 11.

  On the other hand, a rectangular notch 21 is formed in a portion where the right side wall 13d of the cover 13 and the top plate 13g are continuous, and one top plate 13g forming the notch 21 is formed below the notch 21. A substantially U-shaped spring piece 22 is integrally provided so as to hang from the portion.

  Accordingly, the cover 13 is placed in the upper opening of the housing 11 (between the inner surfaces of the front wall 11a and the rear wall 11b) so that the flanges 13e and 13f of the cover 13 are placed on the upper surfaces of the front wall 11a and the rear wall 11b of the housing 11. 2, the cover 13 is urged and held in the direction of the arrow X as shown in FIGS. 2 and 4 by the repulsive force of the spring piece 22. Accordingly, the protrusion 20 projects from the inside of the notch 11 of the housing 11 to the left.

  At this time, the left end of the guide protrusion 19 outside the cover 13 is locked (contacted) to the left end edge of the guide hole 18 as shown in FIGS. Then, due to the biasing of the cover 13 to the housing 11 in the left direction (X direction), as shown in FIGS. 2 and 3, the window hole 23 on the cover 13 side and the window hole 17 on the housing 11 side are formed. They will communicate with each other. Therefore, all or a fusible body (fuse) 15 of the fuse circuit component 12 in the housing 11 can be seen from the outside of the housing 11 through the window holes 17 and 23 communicated with each other.

  The fusible link unit according to the first embodiment is configured as described above, and is slidable with the cover 13 covering the upper opening of the housing 11. In this sliding, the flanges 13e and 13f of the cover 13 are supported on the upper surfaces of the front wall 11a and the rear wall 11b of the housing 11, respectively, and the guide protrusions 19 are smoothly guided along the guide holes 18 of the housing 11. Is done by.

  When the cover 13 is attached to the housing 11 so as to cover the opening of the housing 11 as shown in FIG. 3, the spring piece 22 receives the repulsive force of the spring piece 22 as shown in FIG. The side wall 13c of the cover 13 on the opposite side is pressed against the inner surface of the side wall 11c of the housing 11 and held.

  In this state, the window hole 17 on the cover 13 side matches with the window hole 23 on the housing 11 side. Accordingly, the fuse circuit component 12 in the housing 11, particularly the fusible member 15, can be seen through the window holes 23 and 17. At this time, as shown in FIG. 2, the protrusion 25 of the housing 11 is fitted into the engagement hole 26 of the cover 13, and the protrusion 28 of the cover 13 is located inside the side wall 11 c of the housing 11 and Engages with the side wall 11c. Therefore, the cover 13 is connected to the housing 11 in a state where the window hole 17 on the cover 13 side communicates with the window hole 23 on the housing 11 side by the engagement hole 26 and the protrusion 25 and the protrusion 28 and the side wall 11c. Fixed / held.

  On the other hand, when the cover 13 is slid against the housing 11 in the direction of the arrow Y against the repulsive force of the spring piece 22, the spring piece 22 contracts and the window hole 17 forms the front wall on the cover 13 side. 13a and the back wall 13b are closed, and the window hole 23 is closed by the front wall 11a and the back wall 11b on the housing 11 side.

  Therefore, the fuse circuit component 12 in the housing 11 cannot be seen through the window holes 23 and 17. In this way, by sliding the cover 13 with respect to the housing 11, the fusing state of the fusible body 15 in the fuse circuit component 12 can be reliably checked visually from the outer wall side of the housing 11. it can.

  When the cover 13 is slid with respect to the housing 11 in the arrow Y direction, the engagement state of the engagement hole 26 of the cover 13 and the projection 25 of the housing 11 and the projection 28 of the cover 13 and the side wall of the housing 11 It is necessary to release the engaged state of 11c. When the cover 13 is slid with respect to the housing 11 in such a state, a resistance force acting in a direction opposite to the sliding direction to release the engaged state works. It is possible to sensibly notify the user who performs the operation of closing the window hole 17 and the window hole 23.

  4 and 5 show a state in which the housing 11 with the cover 13 attached as described above is attached to and removed from the power supply box 24 for the vehicle. The power supply box 24 has a plastic-molded cylindrical body as a whole, the upper half 24a is thin and the lower half 24b is thick, and the upper half 24a and the lower half 24b are continuous. A stepped portion 24c is formed on the inner peripheral surface at the portion to be performed. Further, a flange portion 24d is formed at the upper end of the power supply box 24 so as to protrude horizontally outwardly.

  As shown in FIG. 4, the distance between the inner side surfaces of the upper half portion 24a is slightly larger than the distance between the outer side surfaces of the upper cylindrical portion of the housing 11, and the distance between the inner side surfaces of the lower half portion 24b is 11 is slightly larger than the distance between the outer side surfaces of the lower cylinder portion.

  Accordingly, when the housing 11 with the cover 13 attached is inserted into the power supply box 24 from the upper opening side thereof, the lower cylindrical portion moves so as to contact the inner surface of the lower half portion 24b, and the upper cylindrical portion is moved. It moves to contact the inner surface of the upper half 24a. Further, when the housing 11 is pushed into the mating box 24, the inclined surface P of the protrusion 20 protruding outside the notch 11h is pressed against the inner edge of the power supply box 24 near the flange portion 24d.

  In response to this pressing force, the inclined surface P of the cover 13 is guided by its inner edge, and the cover 13 moves in the direction of arrow Y in FIG. By this movement, the spring piece 22 is compressed in the lateral direction as shown in FIG. 5, and the window hole 23 of the cover 13 and the window hole 17 of the housing 11 that have been communicated so far are closed to each other. The fuse circuit component 12 in the housing 11 cannot be seen through the holes 23 and 17.

  On the other hand, when the housing 11 is lifted in the opposite direction to the counterpart box 24 as shown in FIG. 4, the pressure on the inclined surface P of the inner peripheral edge is released. For this reason, the cover 13 receives the repulsive force of the spring piece 22 in the housing 11 and moves in the arrow X direction in FIG. When the maximum amount of movement is performed, the window holes 17 and 23 communicate with each other again, and the fuse circuit component 12 inside the housing 11 can be observed.

  As described above, according to the fusible link unit of the first embodiment of the present invention, the window hole 23 of the cover 13 and the window hole 17 of the housing 11 are closed together when accommodated in the mating box 24. Since the window hole 23 of the cover 13 and the window hole 17 of the housing 11 communicate with each other when taken out from the counterpart box 24, the cover can be removed by a simple operation of taking out and storing the fusible link unit 10 from the counterpart box 24. The communication between the 13 window holes 23 and the window hole 17 of the housing 11 can be switched.

(Second Embodiment)
7 to 10 show another embodiment of the fusible link unit according to the present invention. The fusible link unit 30 includes a housing 31 containing a fuse circuit component similar to that in the first embodiment, an opening / closing lid 32 covering an upper opening on the housing 31, and covering the opening / closing lid 32. And a cover 33 attached to the housing 31. The fusible link unit 30 is attached to a power supply box for a vehicle (not shown).

  The housing 31 has substantially the same configuration as that shown in the first embodiment as a whole, and a horizontally long locking groove 35 is formed in the upper part of the front wall 31a and the back wall 31b of the housing 31. An opening / closing lid 32 is attached to the upper opening of the housing 31 by a hinge member 34 so as to be freely opened and closed. Therefore, when the opening / closing lid 32 is rotated about the hinge member 34 and opened, maintenance of the fuse circuit component housed in the housing 31 can be performed. The opening / closing lid 32 is made of a rectangular plastic plate as a whole, and a plurality of window holes 36 are formed therethrough as shown in FIG.

  The cover 33 is a rectangular body having a U-shaped cross section as a whole, and is composed of a front plate 33b and a back plate 33c connected to the front and rear ends of the top plate 33a in the hanging direction. As shown in FIG. 10, a plurality of window holes (cover side window holes) 37 penetrating the front and back surfaces are formed in the upper surface plate 33a of the cover 33. The shape, size, and arrangement (interval) of these window holes 37 are the same as the window holes (open / close lid side window holes) 36 provided in the open / close lid 32.

  A locking claw 38 having a predetermined length is integrally provided on the inner surfaces of substantially center portions of the front plate 33b and the back plate 33c. Therefore, when the front plate 33b and the back plate 33c of the cover 33 are pushed open while being adjusted, and the cover 33 is covered with the cover 33, the locking provided on the front wall 31a and the back wall 31b of the housing 31 is provided. Each locking claw 18 is fitted in the groove 35. The locking groove 35 is formed longer than the locking claw 38 by a predetermined movable amount of the opening / closing lid 32.

  Accordingly, the locking claw 38 can be moved in the horizontal direction in the locking groove 35 within the movable amount, and the window hole 37 of the cover 33 can be communicated with the window hole 36 of the opening / closing lid 32, Can be closed. FIG. 7 shows a situation before the cover 33 is moved with respect to the housing 31. In this situation, the window holes 36 and 37 are closed.

  On the other hand, when the cover 33 is shifted to the right as shown in FIG. 8, the window holes 36 and 37 are opened, and the fuse circuit components in the housing 31 are moved through the window holes 36 and 37. Can be seen from outside. By sliding the cover 33 on the opening / closing lid attached to the housing 31 in such a manner that it can be opened and closed, the state of the fuse circuit component in the housing 31, more specifically, the fusible body can be checked easily and reliably. Can be done.

  In each of the embodiments described above, the fusible link unit is provided in the vehicle. However, other than this, for example, a motorcycle, a pleasure boat, an outboard motor, a yacht with an inboard motor, a small airplane, etc. It can also be installed on vehicles equipped with various electrical components.

1 is a perspective view showing a fusible link unit according to a first embodiment of the present invention. It is a perspective view which shows one operation state of the fusible link unit. It is a front view of the fusible link unit shown in FIG. It is front sectional drawing before mounting the fusible link unit shown in FIG. 3 to a box. It is front sectional drawing after mounting the fusible link unit shown in FIG. 3 in a box. It is the perspective view which fractured | ruptured a part of fusible link unit shown in FIG. It is a perspective view which shows the fusible link unit which concerns on the 2nd Embodiment of this invention. It is the perspective view of the state which shifted the cover of the fusible link unit shown in FIG. 7 in the horizontal direction. It is a perspective view of the state which removed the cover of the fusible link unit shown in FIG. It is a cover of the fusible link unit shown in FIG. 7, (a) is the perspective view, (b) is the vertical side view.

Explanation of symbols

10 Fusible Link Unit 11 Housing
12 Fuse circuit component 13, 33 Cover 14 Connecting plate 15 Fusible body (fuse)
16 Terminal 17 Window hole (Housing side window hole)
17 Guide hole 19 Guide protrusion 20 Projection 21 Notch 22 Spring piece 23 Window hole (cover side window hole)
24 Counterbox (Power box)
P inclined surface 30 fusible link unit 31 housing 32 open / close lid 34 hinge member
35 Locking groove 36 Window hole (opening / closing lid side window hole)
37 Window hole (cover side window hole)
38 Claw

Claims (4)

A fuse circuit assembly having a connection plate and a plurality of terminal portions connected to the connection plate via a fusible body;
A cylindrical housing for housing the fuse circuit component;
An upper part is formed in a cylindrical shape closed by a top plate, and the top plate includes a cover attached to the housing so as to cover the opening of the housing ,
The side wall of the housing is formed with a housing-side window hole that is perforated from the outside to the inside of the housing,
On the side wall of the cover, a cover side window hole is formed which is drilled from the outside to the inside of the cover.
The cover is displaced relative to the housing so that the housing side window hole and the cover side window hole face each other when mounted on the housing, whereby the housing side window hole and the cover a state side window opening can be perceiving said fusible communicating between a state where the housing-side window opening and the cover-side window opening is blocked, but switches fusible link, characterized in Rukoto unit. The cover is provided with a spring that urges the cover in one direction with respect to the housing.
The fusible link unit according to claim 1, wherein the housing side window hole and the cover side window hole communicate with each other when the cover is displaced with respect to the housing by a repulsive force of the spring. The cover is formed with a protrusion whose lower surface is a tapered surface,
While the housing is accommodated in the supply box, by displacing in the direction in which the cover against the repulsive force of the spring by projections provided on the cover comes into contact with the inner surface of the front Stories power box The fusible link unit according to claim 2 , wherein the housing window hole and the cover window hole are closed .   A protrusion is formed on the side wall of the housing,
  The protrusion provided on the housing engages with the engagement hole provided on the side wall of the cover, whereby the housing window hole and the cover window hole can be held in communication with each other. The fusible link unit according to any one of claims 1 to 3.

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