JP5427652B2 - Unit detachment tool for unit energy meter - Google Patents

Description

  The present invention relates to a unit attaching / detaching tool for attaching / detaching various units such as a meter used in a unit watt-hour meter to / from a unit case.

  In recent years, electronic meters have been used instead of mechanical meters as watt-hour meters to measure the amount of electricity used by consumers. In particular, watt-hour meters are unitized and connected by sockets. Adopting this method to improve the safety of work at the time of instrument construction, installation and use of unit-type watt-hour meters that can be multi-functionalized by combining communication units that perform remote meter reading are increasing. .

  The unit-type watt-hour meter is a mechanism in which various units such as a watt-hour meter unit are attached to the unit case, and the wiring is connected to the socket so that the unit is attached to the unit case and at the same time the terminal on the unit side is the unit case. Electrical connection is made to the terminal on the side, saving the labor of wiring work for the operator.

  However, the socket connection part between the unit such as the watt-hour unit and the unit case has a mechanism in which the conductor blade forming one terminal is inserted into and removed from the conductor blade receiver forming the other terminal. In order to increase the reliability of the socket connection part, the blade is strongly sandwiched with the blade holder so as to ensure electrical connection, so in order to insert and remove the terminal on the blade side with respect to the terminal on the blade holder side, A strong force against the clamping force of the blade holder is required. Therefore, when the operator removes the unit from the unit case, the unit should be pulled away from the unit case with a strong force, and when the unit is attached to the unit case, the unit should be pressed against the unit case with a strong force. Required.

  For this reason, when an operator attaches / detaches the unit by hand, the operation is considerably difficult, and particularly when the unit is removed from the unit case, force is applied to pull the unit by hand. There was a risk that when the unit was removed from the unit case, the unit would move too far from the hand and the unit would fall.

  For this reason, a tool that allows the unit to be easily removed from the unit case has been proposed, and an example thereof is disclosed in JP-A-2006-292442.

JP 2006-292442 A

  The tool for removing the unit in the conventional unit-type watt hour meter has the configuration shown in the above-mentioned patent document, and the unit could be smoothly removed from the unit case by applying the lever principle. When installing the unit to the unit case, it cannot be used to press the unit against the unit case. When installing the unit, push the unit toward the unit case by hand, Work is still being done to apply pressing force to the unit until it normally contacts the front surface of the base and the terminal on the unit side and the terminal on the unit case side are electrically connected and are not easily separated.

  However, since the unit-type electricity meter is installed on the wall of the customer's building, etc., when the strength of the installation surface such as the wall is not so high, the operator has to push the unit toward the unit case. When strongly applied, the installation surface cannot withstand this pushing force applied to the installation surface through the base of the unit case, and there is a problem that the installation surface may be damaged.

  The present invention has been made to solve the above-described problems, and provides a unit attaching / detaching tool that can be used not only when removing the unit from the unit case but also when attaching the unit to the unit case, and allowing the unit to be attached and detached safely and smoothly. The purpose is to do.

  The unit attachment / detachment tool according to the present invention is provided with three substantially plate-shaped covers for attaching covers on the front side of the unit case, which are provided so as to protrude from the upper surface and the left and right side surfaces of the base in the unit case of the unit type watt-hour meter. A hole for penetrating the cover fastening portion on the upper surface of the base is formed in the fastening portion, and a notch portion for engaging each cover fastening portion on the left and right side surfaces of the base is provided. A fixed frame that is detachably attached to each cover fastening portion of the base in a surrounding state and is fixed in the front-rear direction of the base, and left and right side portions of the fixed frame that are positioned on the left and right sides of the base. , At least the left and right ends can be mounted so that it can move in the vertical direction over the mounting range of one unit in the base. , With respect to the movable frame erected between the left and right side parts and the convex part for hanging the extraction tool provided on the left and right sides of the unit, the substantially bowl-shaped tip part to be hung on the convex part A unit holding portion that is formed and has a substantially plate-like pressing portion that can be brought into contact with the front surface of the unit, and is attached to the movable frame so as to be movable in the front-rear direction of the base, and the unit holding portion. A drive mechanism for moving the movable frame in the front-rear direction of the base.

  As described above, according to the present invention, the fixed frame is engaged with and fixed to the cover fixing portion in the base of the unit case, the movable frame and the unit holding portion are aligned with the unit position, and the tip of the unit holding portion is set to the unit. When the unit holding part is gradually moved in the front-rear direction of the unit case while applying a force using the driving mechanism with the pressing part positioned on the front side of the unit, the unit is moved to the unit case. The unit can be attached to and removed from the unit case safely and easily and efficiently, and the operator does not need to apply a strong force when working. Prevents adverse effects on the electricity meter installation surface. In addition, since the fixed frame is not fixed to the cover cover of the base, there is no contact with the unit case for supporting the tool, so that the unit case main body portion can be prevented from being damaged, and the airtightness inside the unit case is impaired. It does not cause such a situation and does not adversely affect the instrument.

  In addition, the unit attaching / detaching tool according to the present invention is provided with a notch portion in the pressing portion of the unit holding portion from at least one end portion in the vertical direction to the opposite side as necessary, and at the notch portion position. The vertical dimension of the pressing portion is smaller than the vertical thickness of the unit.

  As described above, according to the present invention, the notch is provided at the end of the pressing portion of the unit holding portion so that the vertical end of the front surface of the unit to be pressed by the pressing portion can be seen through the notch. By checking whether the front surface of the unit to be pressed is aligned with the front surface of the other unit in the normal installation state, the unit front surface to be pressed by the pressing part is aligned with the front surface of the other unit. The normal mounting state can be determined appropriately and easily, the position relationship between the unit and the base can be accurately grasped, work can be completed quickly, work efficiency can be improved, and the unit can be pushed There is nothing too much, and it is possible to avoid damaging the unit or base by applying excessive force.

  Further, in the unit attaching / detaching tool according to the present invention, if necessary, the pressing portion of the unit holding portion is formed with a maximum vertical dimension larger than the vertical thickness of the unit. At the end, it is arranged so that it can come into contact with the front surface of the existing other unit adjacent to the unit to be pressed by the pressing portion, and a part of it is relatively brought into contact with the front surface of the other unit that is already in a normal mounting state. When the target unit to be moved and pushed by the pressing part reaches the position of the normal mounting state, the exposed state on the front side of the part of the pressing part that is relatively moved is the normal unit to be pushed by the pressing part. It is provided with an attachment state instructing section that changes before reaching the position of the proper attachment state.

  As described above, according to the present invention, the mounting state instructing portion is provided at the end of the pressing portion of the unit holding portion so as to be able to move partly relative to the front surface of the other unit already in the normal mounting state. It is possible to check whether the unit to be pressed by the pressing unit has reached the position of the normal mounting state from the change in the exposed state on the front side of the part of the pressing unit that moves relative to the pressing unit. It can be easily judged from the front side of the machine, it can accurately grasp that the positional relationship between the unit and the base has reached the normal mounting state, and work can be completed quickly, improving work efficiency and pushing the unit too much It is possible to avoid damaging the unit or base by applying excessive force.

  In addition, in the unit attaching / detaching tool according to the present invention, the fixing frame is provided with elongated holes extending vertically in the left and right side portions at least over the attachment range of all units in the base, as necessary. The movable frame is engaged with the end of the rectangular cross-section in the elongated hole of the fixed frame, and is movable in the vertical direction over the perforated range of the elongated hole, the movable frame other than the fixed frame, the unit holding portion, In addition, the center of gravity of the entire vertically movable portion including the drive mechanism is located at a position away from the fixed frame toward the front side of the base.

  As described above, according to the present invention, a long hole continuous in the vertical direction is formed in the fixed frame, and the long hole is engaged with the end of the movable frame having a rectangular cross-sectional shape so that the movable frame is mounted on the base. It is movable over the mounting range of all units, and the center of gravity of the entire vertically movable part other than the fixed frame is positioned away from the fixed frame to the front side of the base, so that the vertically movable part is the front part of the base of the movable frame. Is tilted so that the end of the movable frame is further downward, the end of the movable frame is tilted within the long hole of the fixed frame, and the corner of the end of the movable frame is in contact with the peripheral edge of the long hole of the fixed frame. Because of the friction between the corner of the movable frame end and the peripheral edge of the long hole and the balance of moments around the corner due to the center of gravity of the entire vertical movable part, the vertical movable part is fixed frame. By holding the unit in a stationary state without falling, the vertical movable part including the movable frame is moved to a position where the unit is not attached or removed, and the vertical movable part is tilted to be held. For example, you can completely remove the unit removed with the tool until it can be removed without requiring a strong force, or place the unattached unit in the position to be installed and press it with the tool. In this case, the fixed frame is fixed to the base as it is, and the movable frame, the unit holding part, etc. can be obtained without interfering with the above work. There is no need to install tools, and when handling the unit by hand during work, the movable frame and unit holding part are not obstructed by hand. Without troublesome as holds the location, it is markedly improved workability when performing the mounting of the unit, a removal continuously.

  Further, the unit attaching / detaching tool according to the present invention is supported as a drive mechanism so as to be rotatable at the base front position of the movable frame, and is screwed into the unit holding portion as needed. A screw shaft that moves the unit holding portion in the longitudinal direction of the base by relatively moving the screwing position with the unit holding portion, and a handle that manually rotates the screw shaft.

  As described above, according to the present invention, the screw shaft parallel to the front-rear direction of the base that is rotatably supported by the movable frame and is screwed to the unit holding portion, and the handle that rotates the shaft form a drive mechanism. By moving the unit holding part by manual rotation of the screw shaft via, applying force to the unit with the tip or pressing part of the unit holding part and moving it, a strong force can be reliably applied to the unit with a simple structure. In addition, attachment and removal can be executed, and the unit holding part and the unit moved by this can be gradually moved in the longitudinal direction of the base due to the screwed relationship with the screw shaft, and the unit and base are impacted. Anyone can easily and appropriately install / remove the unit without giving it.

  In addition, the unit attaching / detaching tool according to the present invention is provided with an opening in a part of the movable frame and / or the unit holding part on the front side of the base from the tip part of the unit holding part, if necessary. The tip portion can be viewed from the front side of the base.

  As described above, according to the present invention, by providing the movable frame or the unit holding portion with the opening that makes the tip of the unit holding portion visible from the front side of the unit holding portion and the movable frame, the tip portion of the unit holding portion is provided. The operator can carry out the work on the convex part of the unit while checking the tip part. After aligning the position of the tip part in the longitudinal direction of the base with the small convex part, the unit holding part is shifted with the movable frame etc. It becomes easy to perform a fine work of hanging the part on the convex part, greatly improving workability and shortening the work time.

It is a perspective view of the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a front view of the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a rear view of the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a top view of the tool for unit attachment / detachment concerning the 1st embodiment of the present invention. It is a bottom view of the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a right view of the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is an exploded explanatory view of a unit case to which a unit attaching / detaching tool according to the first embodiment of the present invention is applied. It is a base attachment state front view of a unit to which a unit attaching / detaching tool according to the first embodiment of the present invention is applied. It is a front view of the base which applies the tool for unit attachment / detachment concerning the 1st embodiment of the present invention. It is an attachment start state explanatory drawing to the base of the tool for unit attachment and detachment concerning a 1st embodiment of the present invention. It is a fixed state explanatory view to the base of the unit attachment / detachment tool concerning a 1st embodiment of the present invention. It is a perspective view of the fixed state in the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a front view of the fixed state in the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is position alignment explanatory drawing of the unit holding | maintenance part at the time of the unit removal operation | work by the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a unit drawing state explanatory view in a unit holding part at the time of unit removal work by a unit attaching / detaching tool concerning a 1st embodiment of the present invention. It is a unit holding | maintenance part removal state explanatory drawing from the unit pulled out at the time of unit removal operation | work by the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the holding state to the fixed frame part uppermost part of the up-and-down movable part in the unit attachment or detachment tool which concerns on the 1st Embodiment of this invention. It is position alignment explanatory drawing of the unit holding | maintenance part at the time of the unit attachment operation | work by the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a unit press state state explanatory view in a unit holding part at the time of unit attachment work by a unit attachment and detachment tool concerning a 1st embodiment of the present invention. It is a unit holding | maintenance part removal state explanatory drawing from the unit of a normal attachment state at the time of the unit attachment operation | work by the unit attachment / detachment tool which concerns on the 1st Embodiment of this invention. It is a front view of the fixed state in the tool for unit attachment / detachment concerning the 2nd Embodiment of the present invention. It is a bottom view of the unit attachment / detachment tool which concerns on the 2nd Embodiment of this invention. It is schematic structure explanatory drawing of the attachment state instruction | indication part in the tool for unit attachment / detachment which concerns on the 2nd Embodiment of this invention. It is operation state explanatory drawing of the attachment state instruction | indication part at the time of the unit attachment operation | work by the unit attachment / detachment tool which concerns on the 2nd Embodiment of this invention.

(First embodiment of the present invention)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In each of the drawings, the unit attaching / detaching tool 1 according to the present embodiment surrounds the upper and left sides of the base 51 in the unit case 50 of the unit type watt hour meter. A fixed frame 11 that is detachably attached to the movable frame 12, a movable frame 12 that is constructed to be movable in the vertical direction on the left and right side portions 11b and 11c of the fixed frame 11, a substantially bowl-shaped tip portion 13a, A unit holding portion 13 having a substantially plate-like pressing portion 13b and attached to the movable frame 12 so as to be movable in the front-rear direction of the unit case 50, and the unit holding portion 13 with respect to the movable frame 12 before and after the unit case 50 The screw shaft 14 and the handle 15 are used as the drive mechanism that moves in the direction.

  The unit watt-hour meter to which the unit attaching / detaching tool 1 according to this embodiment is applied has three substantially plate-like cover fastening portions 52, 53 for attaching the transparent cover 55 on the front side of the unit case 50, 54 are provided so as to protrude from the upper surface and the left and right side surfaces of the base 51 of the unit case 50, respectively. These cover fastening portions 52, 53, 54 are provided with female screw portions for fixing the cover. In addition, regarding the unit 60 to be attached and detached, it is assumed that convex portions 61 for hanging a known extraction tool are provided on both the left and right sides of the unit 60, respectively.

The fixed frame 11 is formed in a substantially U shape having an upper side portion 11a and left and right side portion portions 11b, 11c, and is provided with three substantially plate-like covers provided on the upper surface and left and right side surfaces of the base 51 in the unit case 50. A hole 11d is formed in the upper side portion 11a to allow the cover fastening portion 52 on the upper surface of the base 51 to penetrate from below to be engaged with the fastening portions 52, 53, and 54, and the left and right side portions 11b and 11c have a base. Notch portions 11e and 11f for engaging the cover fastening portions 53 and 54 on the left and right side surfaces from below are provided, respectively, and can be attached to and detached from the cover fastening portions 52, 53 and 54 of the base 51 in the vertical direction. On the other hand, the front-rear direction of the base 51 is in a constrained state and is disposed so as to surround the upper side of the base 51 and both the left and right sides.
The left and right side portions 11b and 11c of the fixed frame 11 are respectively provided with elongated holes 11g and 11h over substantially the entire vertical direction, and the ends of the movable frame 12 are vertically aligned with the elongated holes 11g and 11h. It will engage so that it can move.

The fixed frame 11 is formed in a shape slightly larger than the outer shape of the base 51 within a range that can be attached to and detached from the cover fastening portions 52, 53, and 54 of the base 51. It is preferable in that a minute difference can be absorbed.
The fixed frame 11 takes into account the possibility of attaching a predetermined working tool slightly larger than the width of the base 51 to the terminal portion 51a below the base 51, and determines the length of the left and right side portions 11b and 11c as the terminal It is preferable to set so as not to reach the side of the portion 51a. However, the fixed frame 11 is not limited to the substantially U-shaped configuration including the upper side portion 11 a and the left and right side portions 11 b and 11 c, and surrounds the entire base 51 including the lower side of the base 51. It can also be set as the structure formed in the closed rectangular shape.

  The movable frame 12 is provided with left and right end portions that are movable in the vertical direction in the long holes 11g and 11h of the left and right side portions 11b and 11c of the fixed frame 11, respectively, and between the side portions 11b and 11c. It is the structure constructed by. Specifically, the movable frame 12 is formed as a substantially U-shape including a front side portion 12a and left and right side portions 12b and 12c, and after the left and right side portions 12b and 12c are substantially J-shaped. The end portions 12d and 12e on the side are engaged with the long holes 11g and 11h so as to be movable in the vertical direction over the drilling range of the long holes 11g and 11h, and the side portions 11b and 11c of the fixed frame 11 It is the structure arrange | positioned in the state which protruded largely from the fixed frame 11, although it located in between.

  Since the perforation range of the long holes 11g and 11h of the fixed frame 11 extends to the attachment range of all units in the base 51 of the unit case 50, the movable frame 12 is vertically moved over the attachment range of all units in the base 51. It can move in the direction.

  The front side portion 12a of the movable frame 12 is located in front of the base 51, and the screw shaft 14 is rotatably supported at the center of the front side portion 12a.

The unit holding part 13 is formed with a substantially bowl-shaped tip part 13a hung on the left and right convex parts 61 of the unit 60 on the left and right sides, and a substantially plate-like pressing part capable of contacting the front surface of the unit 60. 13b, and is attached to the movable frame 12 so as to be movable in the front-rear direction of the unit case 50. Specifically, the unit holding portion 13 has a substantially U-shaped portion including a front side portion 13c and left and right side portions 13d and 13e, and a substantially bowl-shaped tip portion 13a is formed on the left and right side portions 13d, 13e, and a substantially plate-like pressing portion 13b is arranged to extend over a substantially middle portion between the left and right side portions 13d and 13e, and the left and right side portions 13d and 13e are provided on the left and right sides of the movable frame 12. The side portions 12b and 12c are arranged on the inner side of the movable frame 12 with the tip end portion 13a positioned on the rear side of the unit case 50.
A screw portion of the screw shaft 14 rotatably supported by the front side portion 12a of the movable frame 12 is screwed into the center portion of the front side portion 13c of the unit holding portion 13.

  The distal end portion 13a is substantially sized so as to be able to enter the gap 62 formed between the convex portions 61 on the left and right sides of the unit 60 and the base 51 in a state where the unit 60 is completely attached to the base 51 of the unit case 50. (See FIGS. 6, 7, and 15), the tip 13 a is inserted into the gap 62 and hung on the convex portion 61, and the unit holding portion 13 is moved to the front side of the unit case 50. This is a mechanism in which the unit 60 integrated with the portion 61 can be moved to the front side of the unit case 50, that is, to the removal side.

  The pressing portion 13b is formed as a substantially rectangular substantially plate-like body whose vertical dimension is larger than the maximum vertical thickness of the unit 60 attached to the base 51, and is one end in the vertical direction, for example, the opposite side from the lower end. A notch portion 13f having a predetermined width is provided toward the top, and a reinforcing rib portion 13g is formed as needed from a plate surface. The notch 13 f is notched so that the minimum vertical dimension of the pressing portion 13 b with the notch 13 f is smaller than the vertical thickness of the unit 60. The surface on the rear side of the unit case 50 of the pressing portion 13b excluding the notch portion 13f is made of an elastic material such as rubber that functions as a cushioning material when contacting the front surface of the unit 60 and prevents the front surface of the unit 60 from being damaged. A sheet 13h is attached.

  Since the vertical dimension of the pressing portion 13b is larger than the maximum vertical thickness of the unit 60, the vertical end of the pressing portion 13b is connected to the existing unit 60 adjacent to the unit 60 to be pressed by the pressing portion 13b. Contact is possible (see FIG. 20). Moreover, in the notch part 13f, the front end part of the unit 60 to be pressed by the pressing part 13b, for example, the lower end part of the front face is visible from the front side of the unit case 50 (see FIGS. 13 and 14).

  The positional relationship between the pressing portion 13b and the tip portion 13a is such that the pressing portion 13b is almost in contact with the vicinity of the front surface of the unit 60 in a state where the tip portion 13a is hooked on the convex portion 61 of the unit 60, and Even when the pressing portion 13b is in contact with the front surface of the unit 60 in a state where the sheet 13h is fully compressed, the tip portion 13a is not so far from the convex portion 61 and remains within the dimension range of the gap 62 and the base 51. A relationship that cannot be accidentally contacted is set.

  Note that the tip 13a of the unit holding part 13 is difficult for the operator to visually recognize from the front side of the unit case 50 due to the presence of the pressing part 13b and the unit 60 during the attachment / detachment work of the unit 60. In order to make it easier for a person to grasp the position of the front end portion 13a in the front-rear direction of the unit case 50, a mark or the like indicating a change in the front-rear direction of the unit case 50 of the unit holder 13 relative to the movable frame 12 that does not move in the front-rear direction of the unit case 50 Are provided on the visible surface of the unit holding part 13 and the movable frame 12, respectively, and in particular, the tip part 13a exists in the gap 62 between the convex part 61 of the unit 60 and the base 51 in a state of being completely attached to the base 51. The unit case 50 is provided with a mark or the like indicating the same positional relationship in the front-rear direction of the unit case 50. And the movable frame 12 may be provided respectively. The operator can easily grasp the position of the front end portion 13a in the front-rear direction of the unit case 50 from the coincidence of the marks on the surface of the unit holding portion 13 and the movable frame 12. The efficiency of the operation | work which moves the movable frame 12 and the unit holding | maintenance part 13 and hang | hangs the front-end | tip part 13a on the convex part 61 can be improved.

  In addition, the movable frame 12 and / or the unit holding unit 13 may be provided with an opening that allows the operator to directly view the tip 13a of the unit holding unit 13 from the front side of the unit case 50. As in the case of providing a mark or the like, the operation of hanging the tip portion 13a of the unit holding portion 13 on the convex portion 61 can be efficiently performed. In this case, if the tip portion 13a is illuminated using an LED or the like, the workability can be further improved.

  The screw shaft 14 is rotatably supported at the central portion of the front side portion 12a in an arrangement relationship orthogonal to the front side portion 12a of the movable frame 12, and is screwed at the central portion of the front side portion 13c of the unit holding portion 13. When the screwing position with the unit holding portion 13 is relatively moved by rotation around the axis, the unit holding portion 13 can be moved in the front-rear direction of the unit case 50 with respect to the fixed frame 11 and the movable frame 12. It is.

  The handle 15 is integrally attached to one end of the screw shaft 14 located on the front side of the unit case 50 from the front side portion 12a of the movable frame 12, and manually rotates the screw shaft 14. The handle 15 can be configured to be compact, for example, by folding or detachable from the screw shaft 14.

  The total dimension of the drive mechanism including the screw shaft 14 and the handle 15 and the movable frame 12 protruding from the base 51 of the unit case 50 to the front side of the unit case 50 in the unit mounting / removing operation state is the same as that of the transparent cover 55 of the unit case 50. When it is removed from the base 51 and shifted to the front side of the base and completely removed for replacement or the like, it is preferable to set the base 51 so as to fit in the minimum space required on the front side of the base. As long as the watt hour meter can be installed normally, it is possible to secure an operation space such as a handle or a movable frame with the tool attached to the base 51 at any location, and the tool can be used for attaching and detaching the unit. .

  Further, regarding the vertically movable portion other than the fixed frame 11 including the drive mechanism including the screw shaft 14 and the handle 15, the unit holding portion 13, and the movable frame 12, the center of gravity of the entire vertically movable portion is from the fixed frame 11. When the vertically movable portion is tilted so that the handle 15 side is positioned downward because it is located away from the front side of the base, the end of the movable frame 12 tilts in the long holes 11g and 11h of the fixed frame 11. Thus, while the corner of the end of the movable frame 12 contacts the peripheral edge of the long hole of the fixed frame 11, the friction between the end of the movable frame and the peripheral edge of the long hole, and the position of the center of gravity of the entire vertical movable part Due to the balance of moments around the corners, the vertically movable part is held in a stationary state without falling with respect to the fixed frame 11 (FIG. 8 reference).

  The uppermost unit mounting position on the base 51 is not normally attached or detached by a tool because a communication unit or the like that can be easily attached and detached by hand is attached. However, the movable frame 12 is moved up to the height of the uppermost unit mounting position. By setting the movement range of the movable frame 12 to such an extent that it can be reached, the upper and lower movable parts including the movable frame 12 can be moved to the uppermost stage in a work situation where the lower two-stage unit in the base 51 is handled by hand. If it is moved up to the height of the unit mounting position and tilted so that the handle 15 side is downward, the vertically movable part can be held without any deviation at this uppermost unit mounting position. The holder 13 or the like does not interfere with the operation of the lower two-stage unit, and the movable frame 12 or the like is dropped by hand. Not so no need to support, perform the tasks of the units smoothly.

  Next, a description will be given of unit attachment / removal work using the unit attaching / detaching tool based on the above-described configuration. First, when removing the unit 60 from the unit case 50, the movable frame 12 and the handle of the tool are mounted on the base 51 in a state where the transparent cover 55 of the unit case 50 is removed in advance and the fixing screws 63 on the left and right of the unit 60 to be removed are loosened. With the frame 15 facing the front side of the base, the fixed frame 11 is covered with the base 51 from above, and the cover fastening portion 52 on the upper surface of the base 51 is passed through and engaged with the hole 11d of the upper side portion 11a of the fixed frame 11. The base frame 51 is fixed to the base 51 by engaging the cover fastening portions 53 and 54 on the left and right side surfaces with the notches 11e and 11f of the left and right side portions 11b and 11c of the fixed frame 11, respectively (see FIG. 11, see FIG.

  After fixing the fixed frame 11, the handle 15 is turned as necessary to adjust the position of the unit holding portion 13 in the longitudinal direction of the base, and the tip end portion 13 a of the unit holding portion 13 is separated from the base 51 and the convex portion 61 of the unit 60. The movable frame 12 is moved up and down with respect to the fixed frame 11 together with the unit holding portion 13 and the like so that the vertical movable portion such as the movable frame 12 can move smoothly in the vertical direction so as not to contact the fixed screw 63. The tip 13a of the unit holding part 13 is positioned immediately above the convex part 61 of the unit 60 to be removed (see FIG. 15A). Further, the handle 15 is turned to adjust the front / rear position of the unit holding portion 13, and after the front end portion 13 a is sufficiently close to the base 51 (see FIG. 15B), the movable frame 12 is moved together with the unit holding portion 13 and the like. The left and right tip portions 13a are respectively hung on the left and right convex portions 61 of the unit 60 (see FIG. 16A).

When the distal end portion 13a is thus hooked on the convex portion 61 of the unit 60, the handle 15 is turned to gradually move the unit holding portion 13 together with the unit 60 toward the front side of the base (see FIGS. 16B and 17A). As the unit 60 moves, the electrical connection state between the unit side terminal 64 and the unit case side terminal 56 is released, and the unit 60 can be easily pulled out by hand. When the unit 60 is moved to this state, if there is no other unit below the unit 60 to be removed, the unit 60 is supported by the hand from below while the movable frame 12 is moved upward together with the unit holder 13 and the like. (See FIG. 17 (B)), and when the unit 60 to be removed and the pressing portion 13b are moved to the uppermost position in the movable range, the upper and lower movable parts including the movable frame 12 are moved forward. When the handle 15 side is tilted slowly so as to be downward, the vertically movable portion is held in a stopped state without falling (see FIG. 18).
In this state, the operator manually removes the unit 60 that has been removed halfway with a tool. If another unit is subsequently removed, the operation is repeated in the same procedure as described above.

  On the other hand, when the new unit 60 is to be installed immediately at the removed position, the operator manually places the new unit 60 at the attachment target position with the vertically movable portion including the movable frame 12 positioned upward. Pushing and reaching the limit position where it can be pushed lightly with the hand just before the electrical connection between the unit side terminal 64 and the unit case side terminal 56 is obtained. Subsequently, when there is no other unit below the unit 60 to be attached, the unit 60 is tilted together with the unit holding unit 13 and the like while supporting the unit 60 from below with the hand. From the state of the unit 60, the position of the unit holding unit 13 is adjusted by moving the handle 15 as necessary to adjust the front and rear positions of the unit holding unit 13 so that the pressing unit 13b of the unit holding unit 13 It is assumed that the left and right tip portions 13a of the unit holding portion 13 are respectively engaged with the left and right convex portions 61 of the unit (see FIG. 19).

  From this state, the handle 15 is turned to gradually move the unit holding portion 13 to the rear side of the base, the front surface of the unit 60 is pushed by the pressing portion 13b, and the unit 60 is gradually brought closer to the base 51 (see FIG. 20). . The pressed unit 60 reaches a normal mounting state in which the unit side terminal 64 and the unit case side terminal 56 are electrically connected, and the front side and the mounting target of another unit visible from the notch 13f of the pressing portion 13b. When it is confirmed that the front surface of the unit 60 is aligned, the rotation of the handle 15 is stopped as the attachment is completed, and the movement of the unit holding portion 13 is stopped.

  Even when the unit 60 is in a normal mounting state, even if the handle 15 is mistakenly rotated, other units 65 and 66 other than the unit 60 to be mounted exist in a normal mounting state. The upper and lower ends of the pressing portion 13b wider than the front surface of the unit 60 to be attached are in contact with the front surfaces of the other units 65 and 66 (see FIG. 20B), and the base rear side after the pressing portion 13b. Therefore, excessive force is not applied to the attachment target unit 60, the base 51, and the like, and damage to these units can be prevented.

  Thereafter, the movable frame 12 and the unit holding portion 13 are shifted upward so that the tip end portion 13a does not hook the convex portion 61 of the unit 60 (see FIG. 21A), and the handle 15 is further turned to turn the tip end portion. 13a is sufficiently separated from the base 51 so that it does not come into contact with the convex portion 61 or the fixing screw 63 of the unit 60 (see FIG. 21B), and the same operation as described above is repeated when another unit is subsequently mounted. . In the case of completion of unit attachment, the work is completed when the fixed frame 11 is lifted and removed from the base 51.

  As described above, in the unit attaching / detaching tool according to the present embodiment, the fixed frame 11 is engaged with and fixed to the cover fastening portions 52, 53, 54 in the base 51 of the unit case 50, and then the movable frame 12 and the unit are fixed. A handle constituting a drive mechanism after the holding portion 13 is aligned with the position of the unit 60 and the tip portion 13a of the unit holding portion 13 is hung on the convex portion 61 of the unit 60 or the pressing portion 13b is positioned on the front side of the unit 60 When the unit holder 13 is moved in the front-rear direction of the unit case 50 by turning 15, the unit 60 can be moved strongly in the direction away from or closer to the unit case 50, so that the unit 60 can be attached to the unit case 50. Removal work can be performed safely and efficiently, and the operator does not have to apply strong force during the work. , Prevent the adverse effect on the installation surface or the like of the unit watt-hour meter. Further, since the fixed frame 11 is not fixed to the cover fastening portions 52, 53, and 54 of the base 51, there is no contact with the unit case 50 related to the support of the tool, so that the unit case 50 main body portion is not damaged. This will not cause any damage to the airtightness inside the unit case, and will not adversely affect the instrument.

  In the unit attaching / detaching tool according to the embodiment, the end of the movable frame 12 is engaged with the long hole of the fixed frame 11 so that the movable frame 12 can slide with respect to the fixed frame 11 without any particular restriction. However, the present invention is not limited thereto. For example, positioning concave portions are provided at predetermined intervals in the vertical direction in the vicinity of or continuously with the long holes of the fixed frame, and the convex portions that are freely engageable with the concave portions on the movable frame side. When the movable frame is slid with respect to the fixed frame, the convex part on the movable frame side is engaged with the concave part on the fixed frame at the position where the tip of the unit holding part can be hung on the concave part of the unit. It is also possible to position the movable frame so that the movable frame and the unit holding part are moved vertically when the unit is installed or removed. That where appropriate can do work by rapidly position is significantly improved the efficiency of work by omitting the labor of alignment.

  Further, in the unit attaching / detaching tool according to the embodiment, as a drive mechanism, the screw shaft 14 rotatably supported by the movable frame 12 is screwed into a part of the unit holding portion 13 so that the screw shaft 14 The unit holding part 13 is moved forward and backward by changing the screwing position of the unit holding part 13 with the screw shaft 14 as it rotates, but the present invention is not limited to this, and the screw shaft is screwed into the base front position of the movable frame. As a result, it can be screwed in the longitudinal direction of the base, and one end is attached to the unit holding portion so as to move integrally in the longitudinal direction while allowing relative rotation, and the handle is attached to the other end of the screw shaft. The unit holding portion can be moved back and forth while screwing the screw shaft back and forth by manual rotation of the handle. In addition, as a drive mechanism, a mechanism using a screw or the like, a mechanism using a reduction gear train or the like may be used, and the drive mechanism is not limited to such a manual mechanism. It is possible to use a mechanism that can automatically move the unit holding part only by using the same method.

  Further, in the unit attaching / detaching tool according to the embodiment, in order to make the movable frame 12 movable in the vertical direction with respect to the fixed frame 11, the movable frame 12 is inserted into the long holes 11g and 11h continuous in the vertical direction of the fixed frame 11. However, the present invention is not limited to this. If the structure is such that the fixed frame and the movable frame are sufficiently rigid and the distance between the side portions hardly changes, the fixed frame and the movable frame are fixed. A vertically movable state in which a groove or ridge provided on the end of the movable frame is slidably engaged with a vertically extending ridge or groove provided on the inner or outer peripheral side of the frame. It can also be set as the structure which obtains.

(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS.
In each of the drawings, the unit attaching / detaching tool 2 according to the present embodiment includes a fixed frame 21, a movable frame 22, a unit holding portion 23, a screw shaft 24, and a handle 25, as in the first embodiment. On the other hand, as a different point, the pressing part 23b of the unit holding part 23 is brought into contact with a part to be pressed by the pressing part 23b, that is, a part of the front surface of an existing other unit in a normal mounting state adjacent to the unit 60 to be mounted. An attachment state indicating portion 26 is disposed to change the exposure state on the front side of the base of the pressing portion 23b of the relatively moving portion.

  In addition to the unit holding portion 23 other than the point where the attachment state instruction portion 26 is disposed, the fixed frame 21, the movable frame 22, the screw shaft 24, and the handle 25 are configured in the same manner as in the first embodiment. Therefore, the description is omitted.

  The attachment state instructing portion 26 has a substantially rod-like portion disposed at the lower end portion of the pressing portion 23b so as to be slidable in a direction orthogonal to the plate surface of the pressing portion 23b. A display piece 26a penetrating in the front-rear direction, and a spring 26b arranged to be connected to the display piece 26a and the pressing portion 23b and biasing the display piece 26a toward the base rear side (see FIG. 24). .

  The spring 26b urges the display piece 26a to the base rear side so that one end portion of the display piece 26a is in a state substantially coincided with the surface of the seat 23h on the base rear side of the pressing portion 23b in a normal state. .

  When the unit 60 to be mounted approaches the position of the normal mounting state as the pressing portion 23b moves, the front of the other unit 65 already in the normal mounting state and the seat 23h are positioned on the base rear side of the pressing portion 23b. The display piece 26a comes into contact with one end of the display piece 26a, and the display piece 26a relatively moves against the urging force of the spring 26b. When the unit 60 to be attached reaches the position of the normal attachment state, the other unit 65 The display piece 26a approaching the front surface further moves relative to the front side of the base, and at the other end portion of the display piece 26a exposed to the front side of the pressing portion 23b, that is, the front side of the pressing portion 23b, The colored portion 26c on the peripheral side surface of the display piece 26a having a different color appears on the surface and becomes visible, so that the unit 60 to be attached is connected to the unit side terminal and the unit case side terminal. Reaches the normal attachment state where electrical connection is made, it is a mechanism capable worker easily determine that the movement of the unit holding section 23 may be stopped.

  Next, a unit mounting operation using the unit attaching / detaching tool based on the above configuration will be described. As a premise, it is assumed that another unit 65 already exists in a normal attachment state below the attachment target position of the unit 60.

  With the vertically movable portion including the movable frame 22 positioned in advance above the position to which the unit 60 is to be attached, the operator manually pushes the unit 60 into the place to be attached, and the unit side terminal and the unit case side terminal It reaches the limit position where it can be pushed lightly with the hand just before the electrical connection is obtained. Subsequently, the movable frame 22 positioned above is lowered together with the unit holding portion 23 and the like, and the handle 25 is turned as necessary to adjust the front and rear positions of the unit holding portion 23, so that the pressing portion of the unit holding portion 23 23b is substantially in contact with the front surface of the unit 60, and the left and right tip portions 23a of the unit holding portion 23 are respectively engaged with the left and right convex portions 61 of the unit. At this time, the lower part of the pressing part 23 b where the attachment state instruction part 26 is located is removed from the front surface of the unit 60 to be attached and is positioned on the front side of the other unit 65.

  From this state, the operator turns the handle 25 to gradually move the unit holding portion 23 toward the rear side of the base, pushes the front surface of the unit 60 with the pressing portion 23b, and gradually brings the unit 60 closer to the base 51 (see FIG. 25 (A)). In the display piece 26a of the attachment state indicator 26a in which the pushed unit 60 reaches a normal attachment state in which the unit side terminal and the unit case side terminal are electrically connected, and is in contact with the front surface of another unit 65. When it is confirmed that the other end portion protrudes greatly to the front side of the pressing portion 23b and the colored portion 26c on the peripheral side surface on the other end side of the display piece 26a appears (see FIG. 25B), the handle 25 is turned as the attachment is completed. The movement of the unit holding part 23 is stopped.

  Thereafter, as in the first embodiment, the movable frame 22 is shifted upward together with the unit holding portion 23 and the like so that the distal end portion 23a does not hang on the convex portion 61 of the unit 60, and the handle 25 is further turned to turn the distal end portion. 23a is separated from the base 51 so as not to come into contact with the convex portion 61 and the fixing screw 63 of the unit 60, and when another unit is subsequently attached, the same operation is repeated. In the case of completion of unit attachment, the work ends when the fixed frame 21 is lifted and removed from the base 51.

  As described above, in the unit attaching / detaching tool according to the present embodiment, the display piece 26a is relatively brought into contact with the front surface of the other unit 65 already in the normal attachment state at the lower end of the pressing portion 23b of the unit holding portion 23. A mounting state indicating unit 26 that can be moved is provided, and the unit 60 to be pressed by the pressing unit 23b is normally mounted due to an exposure state change on the front surface side of the pressing unit 23b of the display piece 26a that moves relative to the mounting state indicating unit 26. Since it can be confirmed whether or not the position of the unit 60 has been reached, the normal mounting state of the unit 60 can be easily determined from the front side of the pressing portion 23b, and the positional relationship between the unit 60 and the base 51 has reached the normal mounting state. It is possible to finish the work promptly by accurately grasping the work efficiency, improving the work efficiency and not pushing the unit 60 with the unit holding part 23 excessively. Adding a force unit 60 and the base 51 and the like is avoided from being damaged.

  In the unit attaching / detaching tool according to the above embodiment, the attachment state instructing portion 26 is provided at the lower end of the pressing portion 23b. However, the pressing portion 23b is not in contact with the front surface of the unit 60 to be attached. It is also possible to adopt a configuration in which a similar attachment state instruction portion is provided at the upper end portion that is not present. Moreover, although it has the structure which can confirm from the exposure state change to the press part 23b front side of the display piece 26a in the attachment state instruction | indication part 26 that the unit 60 of the object pressed by the press part 23b has reached the normal attachment state, Not limited to this, the display unit such as LED and the output unit of the alarm sound are operated according to the positional relationship with the front surface of the other unit in the normal mounting state, and the unit to be pressed by the pressing unit is in the normal mounting state. However, it may be configured to obtain a situation in which the worker can confirm that the above has been reached.

1, 2 Unit attaching / detaching tool 11, 21 Fixed frame 11a Upper side part 11b, 11c Side part 11d Hole 11e, 11f Notch part 11g, 11h Long hole 12, 22 Movable frame 12a Front side part 12b, 12c Side part 12d , 12e End portion 13, 23 Unit holding portion 13a, 23a Tip portion 13b, 23b Press portion 13c Front side portion 13d, 13e Side portion 13f Notch portion 13g Rib portion 13h, 23h Seat 14, 24 Screw shaft 15, 25 Handle 26 Mounting state instruction part 26a Display piece 26b Spring 26c Colored part 50 Unit case 51 Base 51a Terminal part 52, 53, 54 Cover fastening part 55 Transparent cover 56 Unit case side terminal 60, 65, 66 Unit 61 Protruding part 62 Gap 63 Fixed Screw 64 Unit side terminal

Claims (6)

Covering the upper surface of the base against the three plate-shaped cover fixing parts for attaching the cover on the front side of the unit case, which is provided to protrude from the upper surface and the left and right side surfaces of the unit case of the unit watt-hour meter. Each of the base cover fastening portions in a state of being provided with notches for engaging the cover fastening portions on the left and right sides of the base and at least surrounding the upper side and the left and right sides of the base. A fixed frame that is detachable with respect to the front and rear direction of the base and is disposed in a fixed state;
The left and right side portions located on the left and right sides of the base in the fixed frame are respectively attached to the left and right end portions so as to be movable in the vertical direction over at least one unit attachment range in the base, A movable frame erected between,
Approximate plate shape that is formed on the left and right sides of the convex part for hanging the extraction tool provided on the left and right sides of the unit. A unit holding portion that is attached to the movable frame so as to be movable in the front-rear direction of the base,
A unit attachment / detachment tool for a unit-type watt-hour meter, comprising: a drive mechanism for moving the unit holding portion in the longitudinal direction of the base relative to the movable frame. In the unit attachment / detachment tool according to claim 1,
A notch is provided in the pressing portion of the unit holding portion from at least one end in the vertical direction toward the opposite side,
A unit attaching / detaching tool characterized in that the vertical dimension of the pressing portion at the notch position is smaller than the vertical thickness of the unit. In the unit attachment / detachment tool according to claim 1,
The pressing part of the unit holding part is formed with the maximum vertical dimension larger than the vertical thickness of the unit,
At the end in the vertical direction of the pressing portion, disposed so as to be able to contact the front surface of an existing other unit adjacent to the unit to be pressed by the pressing portion, and contact with the front surface of the other unit already in a normal mounting state, When the unit to be pressed by the pressing portion reaches a position of a normal mounting state, the exposed state on the front side of the pressing portion of the portion that is relatively moved is changed to the pressing portion. A tool for attaching / detaching a unit, comprising: an attachment state instructing unit that changes the unit to be pressed before reaching a position of a normal attachment state. In the unit attachment / detachment tool according to any one of claims 1 to 3,
The fixed frame is provided with elongated holes that are continuous in the vertical direction over the attachment range of all units in the base at the left and right side portions, respectively.
The movable frame is engaged with the end of the rectangular cross section in the long hole of the fixed frame, and is movable in the vertical direction over the drilling range of the long hole,
A unit attaching / detaching tool characterized in that the center of gravity of the entire vertically movable portion including the movable frame other than the fixed frame, the unit holding portion, and the drive mechanism is located at a position away from the fixed frame toward the front side of the base. In the unit attachment / detachment tool according to any one of claims 1 to 4,
The drive mechanism is rotatably supported at the base front position of the movable frame, and is screwed into the unit holding portion, and the screw holding position with the unit holding portion is relatively moved along with the rotation to hold the unit. A tool for attaching and detaching a unit, comprising: a screw shaft for moving the portion in the longitudinal direction of the base; and a handle for manually rotating the screw shaft. In the unit attachment / detachment tool according to any one of claims 1 to 5,
An opening is provided in a part of the movable frame and / or unit holding part on the front side of the base from the tip part of the unit holding part, and the tip part can be viewed from the front side of the base through the opening part. A tool for attaching and detaching the unit.

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