JP2013121257A - Fall prevention implement for switchboard, and fixing jig used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention implement for a switchboard, which can be safely and easily attached to the switchboard and can prevent a falling accident of the switchboard during the transportation, inspection or the like, and to provide a fixing jig which is hard to be removed when vibration is applied during the transportation, and is used in the fall prevention implement for the switchboard.SOLUTION: A fall prevention implement 1 includes: metal plates 4a and 4b; a base 7 attached to an attachment part 5 through a spacer 6; a cushioning material 8; a positioning member 11 erected in the vicinity of the rear end of the attachment part 5; and a tumbler-shaped hole 10 formed in a state of communicating with an erection part 9 in an upper part in the vicinity of the front end of the erection part 9. The fixing jig 2 has such a structure that a bolt 16 with a square-root round head having a spring washer 17, a flat washer 18 and a slipping out preventing plate 15 mounted on a shaft part 16a is screwed into a nut 19. The slipping out preventing plate 15 has such a structure that an engaging part 15b having a rectangular shape in a plan view is formed so as to make approximately right angle when viewed from a side, on one end of a flat plate part 15a which has a bolt hole 20 through which the bolt 16 with the square-root round head is inserted and has a rectangular shape in a plan view.

Description

  The present invention relates to a tipping prevention tool and its fixing jig that are used by being attached to the lower part of the switchboard in order to prevent a fall accident during transportation and the like, and in particular, it is possible to perform mounting work from only one side of the switchboard. The present invention relates to a tipping prevention device for a power distribution board and a fixing jig used therefor.

  Distribution boards manufactured and shipped from factories are generally packed in wooden frames, vinyl, etc., then loaded onto trucks and delivered to the site. Upon arrival at the site, the switchboard is lifted by a crane or the like and lowered from the truck bed. And the switchboard dropped from the truck has been conventionally held by a plurality of workers while being laid down and transported to the installation site. However, with such a method, there is a risk that the operator may be injured or damaged when the switchboard is laid down or raised or during transportation. Therefore, recently, a method of transporting the switchboard in an upright state using a cart or the like has been proposed, and some inventions and devices have already been disclosed in this regard.

For example, in Patent Document 1, a multi-frame control panel corresponding to the “distribution panel” of the present invention is arbitrarily combined and connected under the name “multi-purpose weight truck” and transported between lines of the control panel. In addition, a device related to a transport carriage that can be used as a workbench for assembly and inspection is disclosed.
The device disclosed in Patent Document 1 has a structure including a slide mechanism that changes the vertical and horizontal positions of the piece screw and a fixed stopper that floats the wheel so as to correspond to the mounting hole position of the frame.
According to such a structure, the carriage mounting mechanism can follow the various mounting pitch holes of the various frame boards, so that the frame board installation work is simplified. Further, the carriage can be fixed so that the carriage does not move without permission.

When the switchboard is mounted on the carriage as described above, it is necessary to temporarily fix the switchboard to the carriage so as not to drop during transportation. If bolts and nuts are used at this time, the nuts must be fixed with one hand, and the bolts must be tightened with the other hand, so that workability is poor. Therefore, it is advantageous to have a jig that restricts the rotation of the bolt when tightening the bolt. As such a jig, for example, Patent Document 2 discloses an invention relating to an apparatus used when connecting adjacent boards such as a control apparatus under the name of “row board connecting apparatus”. The present invention is used for a board having a connection hole in a side plate, and has a top surface that is open and parallel to the side plate so as to cover the connection holes of both side plates of the adjacent board. A box body provided with hexagon bolt insertion holes is welded to the inner surfaces of the both side plates, and the bolts of the other box body are connected to the hexagon nuts inserted into one side of the box parallel to the both side plates. A hexagon bolt inserted into the insertion hole and the connection hole of both boards is screwed.
According to such a structure, when the hexagon bolt is tightened, the rotation of the hexagon nut is restricted by the box, so that workability is good.

Further, Patent Document 3 discloses a device relating to a “table board connection structure” capable of performing all the connection work of the rows on one board side.
The device disclosed in Patent Document 3 is applied to a row board having a round hole portion through which a nut is inserted and a long hole portion continuously formed in the round hole portion so as to accommodate a shaft portion of a bolt. A stopper that engages with the elongated hole portion and restricts rotation of the nut is fixed to a notch surface of the washer of the nut. According to such a structure, it is possible to perform the connecting work on one panel side even when a sufficient work space cannot be secured, such as the operator's hand does not enter one of the switchboards. is there.

Japanese Utility Model Publication No. 2-117964 JP-A-9-298807 Noto 3120482

  In the device disclosed in Patent Document 1 which is the above-described prior art, since the mounting holes of the frame provided on the lower surface of the control panel are used, the work is performed under the control panel suspended by a crane or the like. In addition to the risk of injury, a person has to insert a hand and fasten the screw, and there is a problem that the work of fixing the control panel to the carriage cannot be performed efficiently. Further, since the structure is not capable of preventing a fall, the control panel may fall during transportation or inspection.

  In addition, when using the invention disclosed in Patent Document 2 when fixing the switchboard or the like to the carriage, it is necessary to perform a process of welding the box inside the side surface of the switchboard, which increases the work cost. There was a problem. Also, since a hexagon nut must be installed inside one box and a hexagon bolt must be inserted from the other box side, it should be used in situations where the operator's hands cannot enter the switchboard. I can't.

  Furthermore, in the device disclosed in Patent Document 3, since the connection work can be performed on one panel side, when the switchboard is fixed to the carriage, the operator's hand does not enter the switchboard. Can even be used. However, when the connection structure of the present invention is used for such an application, the bolt may move from the long hole portion to the round hole portion due to vibration during transportation and may come off.

  The present invention has been made in response to such a conventional situation, and can be safely and easily attached to the switchboard, and can prevent the switchboard from being accidentally overturned during transportation or inspection. An object of the present invention is to provide a fall prevention tool and a fixing jig used for a fall prevention tool for a switchboard, which is difficult to come off even when subjected to vibration during transportation.

In order to achieve the above object, the invention described in claim 1 is a fixing jig attached to a plate member having a round hole portion and a long hole portion formed continuously from the round hole portion. A flat plate portion provided with a head that can be inserted into the round hole, a round head square bolt having a square root that can be engaged with the long hole, and a bolt hole through which the shaft of the round head square bolt is inserted. And a disengagement prevention plate that is formed at one end of the flat plate portion to have a rectangular locking portion formed in a plan view so as to form a right angle when viewed from the side, and a nut into which the shaft portion of the round head square bolt is screwed. The detachment prevention plate is inserted into the shaft portion of the round head square root bolt, and the engagement portion comes into contact with the inner peripheral surface of the round hole portion with the square root portion engaged with the elongated hole portion of the round hole. It is formed as follows.
In the fixing jig having such a structure, when the square root of the square root round head bolt is engaged with the long hole portion of the round head hole when attached to a plate having a round hole, Both have the effect of preventing rotation. Moreover, even when the fixing jig is subjected to vibration when transporting the plate material attached to the daruma hole, the detachment prevention plate in which the locking portion comes into contact with the inner peripheral surface of the round hole portion of the daruma hole. However, since it restrains the movement of the round head bolt, it has the effect of preventing the square root from being detached from the long hole portion of the daruma hole.

Further, the invention described in claim 2 is a switchboard fall prevention device attached to a switchboard having a connection hole having the same shape as the daruma hole using the fixing jig described in claim 1, wherein the daruma hole is provided. In addition, an upright portion formed so as to be able to contact the side plate of the switchboard, an L-shaped metal plate in a side view including an attachment portion orthogonal to the upright portion, and an attachment portion of the metal plate are fixed on the upper surface And a fixing jig.
In the switchboard overturn prevention device having such a structure, the metal plate fixes the base with respect to the switchboard and has an effect of preventing the switchboard from overturning in the lateral direction. Moreover, when the base is shaped so as to protrude in the front-rear and lateral directions of the switchboard, the switchboard is less likely to fall over in the front-back and lateral directions. Furthermore, it has the effect that it is difficult to come off from the switchboard even when it receives vibration during transportation. And it has the effect | action of being fixed to the side surface of a switchboard easily and reliably by the fixing jig of Claim 1.

Furthermore, the invention according to claim 3 is the switchboard fall prevention device according to claim 2, wherein the metal plate is provided with a cushion material that is attached to a standing portion on the side that contacts the side plate of the switchboard. It is a feature.
In addition to the operation of the invention according to claim 2, the switchboard fall prevention device having such a structure has an operation of protecting the side surface of the switchboard from being damaged by the cushion material.

According to a fourth aspect of the present invention, in the switchboard overturn prevention device according to the second or third aspect, the switchboard is attached to a switchboard having a positioning hole on the lower surface, and can be inserted into the positioning hole. , It is characterized by comprising a positioning member erected on the mounting portion of the metal plate.
In addition to the operation of the invention according to claim 2 or 3, the switchboard overturn prevention device having such a structure has an effect that the positioning member prevents horizontal displacement with respect to the switchboard.

  According to the invention described in claim 1 of the present invention, it is not necessary to hold and fix the head and the shaft portion by hand when tightening the round head bolt, and only the nut needs to be rotated. Therefore, workability is good. Moreover, even when it receives vibration at the time of transportation, it is possible to prevent a situation in which the square root portion of the square root round head bolt moves to the round hole portion side of the daruma hole and the fixing jig comes off from the daruma hole.

  According to invention of Claim 2 of this invention, the safety | security at the time of conveyance work can be improved. In addition, since it is not necessary for the operator to put a hand into the lower surface of the switchboard to perform bolt fastening work or the like, safety during mounting work is also increased. Furthermore, since the metal plate is attached from the outside to the side surface of the switchboard, the attachment work can be performed without any trouble even if the operator's hand does not enter the switchboard.

  According to invention of Claim 3 of this invention, in addition to the effect of invention of Claim 2, the fall of the product value of the switchboard by the damage | wound of a side surface can be prevented.

  According to the invention described in claim 4 of the present invention, in addition to the effect of the invention described in claim 2 or claim 3, it is possible to reliably prevent the switchboard from being displaced in the horizontal direction and to ensure safety during transportation. Can be increased.

(A) And (b) is the side view and front view of the switchboard fall prevention tool which concern on embodiment of this invention, respectively. (A) And (b) is the external appearance perspective view of the fall prevention tool for switchboards of a present Example, respectively, and the side view of the Example of a fixing jig. (A) And (b) is the front view and side view of a detachment prevention plate, respectively. FIG. 4A is a partially enlarged view of a dart hole with the fixing jig removed in FIG. 1A and its periphery, and FIG. 4B is a drawing of the fixing jig in FIG. 4A. It is a figure which shows the attached state. (A) And (b) is a figure for demonstrating the dimension of a fall prevention board and a daruma hole, respectively. (A) thru | or (c) is a longitudinal cross-sectional view of the daruma hole for demonstrating the procedure which attaches a fixing jig. (A) And (b) is the figure which expanded a part of XX arrow directional cross section and YY arrow directional cross section of FIG.4 (b), respectively.

  The switchboard overturn prevention device of the present invention is applied to a switchboard having a daruma hole, which will be described later, and is characterized in that an original fixing jig is used when both are fixed. Hereinafter, these structures will be specifically described with reference to FIGS. 1 to 7.

  FIG. 1A and FIG. 1B are a side view and a front view, respectively, of the tipping prevention device 1 of the present embodiment, and FIG. 2A is an external perspective view of the tipping prevention device 1, FIG. b) is a side view of the fixing jig 2 shown in FIG. FIG. 3A and FIG. 3B are a front view and a side view of the detachment prevention plate, respectively. In addition, in FIG. 1 (a) and FIG.1 (b), the outline of a switchboard is shown with the broken line. Moreover, illustration of the cushion material 8 is abbreviate | omitted in FIG.1 (b).

As shown in FIGS. 1 (a) and 1 (b), the overturn prevention device 1 of this embodiment is mounted on the left and right lower portions of the switchboard 3 by using a fixing jig 2, and the side view L A pair of metal plates 4a and 4b that are shaped like a mirror and are attached to a mounting portion 5 of the metal plate 4a (4b) via a spacer 6, and when the switchboard 3 is transported, wheels (see FIG. (Not shown) is provided with a base 7 to be detachably attached. The metal plates 4a and 4b are respectively provided with bolt holes 21 as will be described later.
The spacer 6 and the base 7 are both made of wooden squares, and the metal plates 4a and 4b and the spacer 6 have the same length as the depth L of the switchboard 3. It is formed longer than the depth L of the switchboard 3 so as to protrude before and after the switchboard 3 when mounted on the switchboard 3.
That is, the base 7 has an effect of preventing the switchboard 3 from falling in the front-rear direction. The metal plates 4a and 4b have an effect of fixing the base 7 to the switchboard 3 via the spacer 6 and preventing the switchboard 3 from falling in the lateral direction. Note that if the base 7 is shaped so as to protrude in the lateral direction of the switchboard 3, the base 7 can also prevent the switchboard 3 from falling in the lateral direction.

As will be described later, the metal plates 4 a and 4 b are provided with positioning members 11 for positioning the tipping prevention device 1 by being inserted into positioning holes (not shown) provided on the lower surface of the switchboard 3. That is, the positioning member 11 has an effect of preventing the horizontal position shift of the fall prevention tool 1 with respect to the switchboard 3.
In the specification of the present application, even when only one of the metal plates 4a and 4b is shown in the drawing, the description using the drawing applies to the other metal plate. The metal plate not shown in the figure, such as “metal plate 4a (4b)”, is indicated in parentheses.

As shown in FIG. 2A, a cushion material 8 is attached to the surface of the metal plate 4b (4a) with respect to the switchboard 3. And on the upper part of the metal plate 4b (4a) and the upright portion 9 of the cushioning material 8 (see FIG. 1 (b) and FIG. 2 (a)), a harpoon hole 10 for attaching the fixing jig 2, and a switchboard Bolt holes 21 are formed so that bolts are inserted into nuts (not shown) welded to the side plates 3a of the third side from the outer surface of the upright portion 9 and tightened.
Further, a positioning member 11 is erected in the vicinity of the rear end of the metal plate 4b (4a) and the attachment portion 5 of the cushion material 8 (see FIGS. 1B and 2A). The metal plate 4b (4a) and the upright portion 9 of the cushion material 8 are partially cut away so that the front end side is high and the rear end side is low.
In the present specification, when the metal plate 4b (4a) and the cushion material 8 are attached to the switchboard 3, the sides close to the front and rear surfaces of the switchboard 3 are referred to as the front end and the rear end, respectively. Further, the side plate 3a (see FIG. 1B) of the switchboard 3 is also provided with a connecting hole (not shown) having the same shape as the dart hole 10 at the attachment position of the fixing jig 2.

The metal plate 4 b (4 a) is fixed to the spacer 6 using two bolts 12, and the spacer 6 is fixed to the base 7 by four nails 13. Further, the base 7 is provided with bolt holes 14 and 14 for inserting bolts for fixing transport wheels (not shown) at two front and rear positions.
Further, as shown in FIG. 2B, the fixing jig 2 is inserted into the disengagement prevention plate 15, and a round-head bolt 16 having a square root bolt 16 having a spring washer 17 and a flat washer 18 attached to the shaft portion 16a is provided. The structure is screwed into the nut 19. As shown in FIGS. 3A and 3B, the detachment prevention plate 15 is a metal plate, and has a rectangular shape in plan view having a bolt hole 20 through which the round-headed bolt 16 is inserted. A locking portion 15b having a rectangular shape in plan view is formed at one end of the flat plate portion 15a so as to form a substantially right angle when viewed from the side. The disengagement prevention plate 15 is formed symmetrically in the width direction (W direction in FIG. 3A) including the locking portion 15b and the bolt hole 20.

Next, referring to FIG. 4, a description will be given of the daruma hole 10 and a state in which the fixing jig 2 is attached to the daruma hole 10.
FIG. 4A is a partially enlarged view of the daruma hole 10 and its periphery in a state where the fixing jig 2 is removed in FIG. 1A, and FIG. 4B is fixed in FIG. 4A. It is a figure which shows the state which attached the jig | tool 2 to the Daruma hole 10. FIG. As shown in FIG. 4 (a), the daruma hole 10 provided in the standing portion 9 of the metal plate 4a (4b) and the cushioning material 8 is a head 16b of the round-root bolt 16 (see FIG. 2 (b)). ) And a round hole portion 10a formed so as to be able to engage with a square root portion 16c (see FIG. 2B) of the round-root bolt 16 so as to be able to be engaged. It consists of a hole 10b. Then, as shown in FIG. 4B, the fixing jig 2 is configured so that the locking portion 15b of the disengagement prevention plate 15 comes into contact with the inner peripheral surface of the round hole portion 10a. Attached to.

5 (a) and 5 (b) are diagrams for explaining the dimensions of the detachment prevention plate 15 and the daruma hole 10, respectively. The dimensions of the detachment prevention plate 15 and the daruma hole 10 will be described with reference to these drawings.
As shown in FIGS. 5 (a) and 5 (b), when the fixing jig 2 is attached to the saddle hole 10 in the detachment prevention plate 15, the locking portion 15b that contacts the inner peripheral surface of the round hole 10a. The corner is A, the distance between the center line P and A of the detachment prevention plate 15 is a, and the length along the center line P from A to the lowest end B of the bolt hole 20 is b. At this time, the width of the locking portion 15b is 2a. On the other hand, for the daruma hole 10, the radius of the round hole 10a is r, the length from the center O to the lowest end C of the long hole 10b is s, and the length of the long hole 10b is h.

  When the fixing jig 2 is attached to the saddle hole 10, as shown in FIG. 5B, the center line Q of the saddle hole 10 coincides with the center line P of the disengagement prevention plate 15, and the length from A to the center O Is equal to the radius r of the round hole 10a. Therefore, when the length along the center line Q from A to the lowest end C of the long hole 10b is d, d is expressed by the following equation (1).

  When the length b along the center line P from A to the lowest end B of the bolt hole 20 is shorter than d, the fixing jig 2 can be attached to the daruma hole 10. However, when the length b is equal to or less than (d-h), the action of the detachment prevention plate 15 to be described later, which prevents the shaft 16a of the square root bolt 16 from coming off from the long hole portion 10b, is not exhibited. The length b must be longer than (d−h). Accordingly, the disengagement prevention plate 15 is formed such that the distance a between the center lines P and A and the length b along the center line P from A to the lowest end B of the bolt hole 20 satisfy the following expression (2). Need to be done.

A procedure for attaching the fixing jig 2 to the daruma hole 10 will be described with reference to FIGS. 6 and 7. 6 (a) to 6 (c) are vertical cross-sectional views of the harpoon hole 10 for explaining the procedure for attaching the fixing jig 2, and FIGS. 7 (a) and 7 (b) are respectively the same as FIG. It is the figure which expanded a part of XX line arrow cross section and YY line arrow cross section of b). In addition, about the component shown in FIG. 1 thru | or FIG. 5, the same code | symbol is attached | subjected and the description is abbreviate | omitted. In addition, since the connection holes provided in the side plate 3a of the switchboard 3 have the same shape and communicate with the saddle hole 10 provided in the metal plates 4a and 4b, the switchboard 3 will be described in the following description for convenience. The connecting hole of the side plate 3a is also referred to as a daruma hole 10.
First, as shown in FIG. 6 (a), a square root round head is formed on the side plate 3a of the switchboard 3, the metal plate 4a (4b) of the tipping prevention device 1, and the round hole portion 10a of the ball hole 10 provided in the cushion material 8. After inserting the bolt 16 from the head 16b, the bolt 16 is lowered in the direction of the arrow D. Thereby, as shown in FIG. 6 (b), the square root portion 16 c of the round-corner bolt 16 is accommodated in the long hole portion 10 b of the drum hole 10. Next, as shown in FIG. 6 (c), the locking portion 15 b of the disengagement prevention tool 15 is bent in a state where the shaft portion 16 a of the round head bolt 16 is inserted into the bolt hole 20 of the disengagement prevention device 15. It is made to contact | abut to the internal peripheral surface of the round hole part 10a of the hole 10. FIG.

  Further, as shown in FIG. 7A, after the spring washer 17 and the flat washer 18 are attached to the shaft portion 16a of the round-root bolt 16, the shaft portion 16a of the round-root bolt 16 can be screwed. The arranged nut 19 is rotated in one direction. At this time, as shown in FIG. 7 (b), the corner root portion 16c of the corner round head bolt 16 engages with the elongated hole portion 10b of the drum hole 10, so that the corner root round head bolt 16 is prevented from rotating. The Therefore, it is not necessary to hold and fix the head portion 16b and the shaft portion 16a by hand at the time of tightening the round head bolt 16, and only the nut 19 needs to be rotated. The operation of rotating the nut 19 can be performed with one hand. Therefore, workability is good. Further, since the engaging portion 15b of the disengagement prevention plate 15 abuts against the inner peripheral surface of the round hole portion 10a of the daruma hole 10, the vertical movement of the rounded round head bolt 16 is restricted. This has the effect of preventing the corner 16c of the round-head bolt 16 from being removed from the long hole 10b. Thereby, even when it receives vibration during transportation of the switchboard 3, the square root portion 16 c of the square root round head bolt 16 moves to the round hole portion 10 a of the saddle hole 10, and the fixing jig 2 is detached from the saddle hole 10. Can be prevented.

  The fall prevention tool 1 including the fixing jig 2 having such a structure has an effect that it is difficult to come off from the switchboard 3 even when it receives vibration during transportation. Therefore, the safety at the time of carrying work can be improved. Moreover, it has the effect | action that it fixes to the side surface 3a of the switchboard 3 easily and reliably with the fixing jig 2. FIG. In this case, since it is not necessary for an operator to insert a hand into the lower surface of the switchboard 3 and perform a bolt fastening operation or the like, the mounting operation can be performed safely. Furthermore, since the metal plates 4a and 4b are attached to the side surface 3a of the switchboard 3 from the outside, the attachment work can be performed without any trouble even if the operator's hand does not enter the switchboard 3. In addition, since the positioning member 11 is installed so as to be orthogonal to the lower surface of the switchboard 3, it is possible to reliably prevent the position shift of the switchboard 3 with respect to the horizontal direction. Therefore, safety during transportation is increased. Further, the cushion material 8 has an effect of protecting the side surface 3a of the switchboard 3 from being damaged. Therefore, it can prevent that the value as the product of the switchboard 3 falls by scratching the side surface 3a.

  In addition, the fall prevention tool for switchboards of this invention and the fixing jig used for it are not limited to the structure shown in the present Example. For example, in the fall prevention tool 1, it can also be set as the structure which attaches the base 7 directly to the lower surface 5 of the metal plate 4a (4b) without the spacer 6 interposed. Further, the cushion material 8 can be omitted. Further, a rod-like body other than a bolt may be used as the positioning member 11. The metal plate 4b (4a) and the upright portion 9 of the cushion material 8 may be partially cut out so that the rear end side is high and the front end side is low, or may not be cut out at all. . Further, the metal plate 4b (4a) and the cushion material 8 may have a structure in which a positioning member 11 is disposed in the vicinity of the front end, and a dart hole 10 is provided in the vicinity of the rear end side. Further, in the fixing jig 2, the washer 17 and the flat washer 18 are used to equalize the tightening pressure of the head of the round-root bolt 16, but may be omitted. Further, the flat portion 15a of the detachment preventing plate 15 does not necessarily have to be formed in a rectangular shape in plan view.

  The invention described in the first to fourth aspects of the present invention is not limited to the switchboard, and can be applied to various cabinets having a harpoon hole.

  DESCRIPTION OF SYMBOLS 1 ... Fall prevention tool 2 ... Fixing jig 3 ... Distribution board 3a ... Side plate 4a, 4b ... Metal plate 5 ... Mounting part 6 ... Spacer 7 ... Base 7a ... Bottom surface 8 ... Cushion material 9 ... Standing part 10 ... Daruma hole 10a ... Round hole portion 10b ... Long hole portion 11 ... Positioning member 12 ... Bolt 13 ... Nail 14 ... Bolt hole 15 ... Detachment prevention plate 15a ... Flat plate portion 15b ... Locking portion 16 ... Round head bolt 16a ... Shaft portion 16b ... Head 16c ... Square root 17 ... Spring washer 18 ... Flat washer 19 ... Nut 20 ... Bolt hole 21 ... Bolt hole

Claims (4)

A fixing jig attached to a plate material having a round hole part and a long hole part formed continuously from the round hole part,
A head that can be inserted into the round hole, a round head square bolt having a square root that can be engaged with the elongated hole, and
A flat plate portion provided with a bolt hole through which the shaft portion of the round head corner bolt is inserted, and a locking portion having a rectangular shape in plan view formed at one end of the flat plate portion so as to form a right angle when viewed from the side. A detachment prevention plate comprising:
A nut to which the shaft portion of the round head square bolt is screwed,
With
The disengagement prevention plate is inserted into the shaft portion of the round head corner bolt, and the engagement portion is formed on the inner peripheral surface of the round hole portion in a state where the square root portion is engaged with the elongated hole portion of the boring hole. A fixing jig characterized by being formed so as to abut. A switchboard fall prevention tool attached to a switchboard having a connection hole having the same shape as the daruma hole using the fixing jig according to claim 1,
A side-view L-shaped metal plate comprising a standing portion formed so as to be able to contact the side plate of the switchboard, and a mounting portion orthogonal to the standing portion, the Daruma hole being provided,
A base on which the mounting portion of the metal plate is fixed on the upper surface;
The fixing jig;
A fall prevention device for switchboards, characterized by comprising:   3. The switchboard overturn prevention device according to claim 2, wherein the metal plate includes a cushion material that is attached to the standing portion on the side that contacts the side plate of the switchboard. A switchboard fall prevention tool attached to a switchboard having a positioning hole on the lower surface,
4. The switchboard overturn prevention device according to claim 2, further comprising a positioning member erected on the attachment portion of the metal plate so as to be insertable into the positioning hole. 5.

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