JPH0540653Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for preventing an electrical equipment unit from falling off when an electrical equipment unit is pulled out from an electrical equipment storage frame such as a switchboard.

[Conventional technology]

In electrical equipment storage frames such as switchboards,
Installation and inspection work is facilitated by configuring the unit frame, which carries the internal electrical equipment, to be freely inserted and removed.

By the way, when this type of unit is configured to be freely insertable and removable, a situation may arise in which when the unit is pulled out, there is excess force and the unit slips out to the front of the frame. If this happens, the unit may fall and the impact may destroy the onboard electrical equipment, or it may fall onto the feet of the worker, causing an accident. Therefore, a stopper is usually provided to ensure safety so that the unit can only be pulled out to a predetermined position. If the unit is to be pulled out beyond that position, another operation is performed to release the unit from the stopper.

For example, Japanese Utility Model Publication No. 52-56424 describes a device in which the unit is lifted slightly by hand or with a suitable lifting device to disengage the stopper and the protrusion, and then the unit is pulled out. And when inserting this unit,
The unit is lifted by hand or other means until the projections are pushed past the stoppers.

Further, Japanese Utility Model Publication No. 55-43684 describes a device in which a stopper mechanism is released by operating a slide lever when removing or inserting a unit, thereby allowing the unit to be inserted or removed.

[Problem that the invention attempts to solve]

However, in the device described in Japanese Utility Model Publication No. 52-56424, the entire unit must be lifted up at the time of insertion and removal, which puts a burden on operation. In addition, the device described in Japanese Utility Model Publication No. 55-43684 has
The stopper mechanism must be released by intentionally operating the slide lever.

Thus, in these conventional mechanisms,
The unit cannot be inserted or removed without lifting it or performing other operations, which requires a lot of labor or complicated operations.

The present invention was devised in view of the conventional situation, and the purpose is to provide a device that can release the stopper mechanism and insert/remove the device without requiring special operations. shall be.

[Means for solving problems]

In order to achieve this purpose, the electrical equipment unit insertion/removal device of the present invention is provided with a stopper in front of the side of the shelf board that partitions the unit storage area in the panel frame so as to protrude above the shelf board. The front part of the stop lever is rotatably attached to the side of the unit frame on which the electrical equipment is mounted, and the rear part of the stop lever has a stopper surface whose front part engages with the stopper when the unit frame is pulled out, and a unit frame insertion part. A side projecting piece having a tapered surface that sometimes crosses over the head of the stopper is provided, and a convex portion that projects downward from the bottom surface of the unit frame is formed on the lower surface of the center of the stop lever. shall be.

As a stopper, by fixing a screw having a head to the shelf board through a collar, a reliable locking function can be achieved with a simple structure.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

5 and 6 are a cross-sectional plan view and a front view showing an embodiment of a switchboard to which the present invention is applied. In these figures, 1 is a panel frame constituting the box of the switchboard, 2 is a shelf board fixed to the panel frame 1 in a required number of stages, and 3 and 4 are doors, respectively. A guide frame 2a is provided on the shelf board 2, and a unit frame 5 to which various devices are attached is inserted and mounted from the front of the board frame 1 along the guide frame 2a. A contact mounting frame 9 having a power contact 7 and a load contact 8 on the back of the unit frame 5 moves in the direction in which both the contacts 7 and 8 are in contact with the unit frame 5, that is, in the front-rear direction. Possibly installed. Both of these contacts 7 and 8 are wired to equipment mounted on the unit frame 5 using electric wires or the like (not shown).

The panel frame 1 is provided with, for example, a three-phase four-wire bus bar 10 and a load side terminal 11 to which the power contacts 7 and load contacts 8 are connected.

The unit insertion/removal device, which is a feature of this invention,
As shown in the figure and FIG. forms a guide when moving back and forth. The base end of a plate-shaped stop lever 14 as shown in FIG. 1 is rotatably attached to the side surface of the unit frame 5 with a screw 16 via a collar 15. Further, a screw 18 is fixed to the shelf board 2 via a collar 17, and this serves as a stopper.

The stop lever 14 has a protruding piece 14A bent in the horizontal direction at its tip, and has a tapered surface 14a at its tip and a stopper surface 1 at the front.
4b respectively. Further, a guide protrusion 14c is provided at the upper part of the tip of the stop lever 14, and this guide protrusion 14c is made to protrude above the flange 5a through a square hole 5b provided in the flange 5a of the unit frame 5, so that the width direction of the stop lever 14 is Shaking is prevented so that the stop lever 14 always maintains a vertical posture. A convex portion 14d is formed at the lower intermediate portion of the stop lever 14, and the unit frame 5
When it is in a predetermined position range on the shelf board 2, the overhanging piece 14A is flipped up to the top of the shelf board 2 (see FIG. 1). Further, a tapered portion 14e is formed at the rear of the convex portion 14d to allow the unit frame 5 to smoothly pass over the end surface of the shelf board 2 when inserted. In addition, when the unit frame 5 is completely removed from the panel frame, the base end 14f hits the lower surface of the collar 5a, causing the stop lever 1
The range of rotation of stop lever 14 is regulated.
The guide protrusion 14c is prevented from coming out of the square hole 5b.

Next, the operation of the insertion/removal mechanism using the stop lever 14 and the stopper screw 18 configured as described above will be explained. Insert the unit frame 5 in the insertion position shown in Figure 1.
By holding the handle 5c at the front of the unit frame 5 and pulling it out, the unit frame 5 moves forward on the shelf board 2.
That is, it moves to the left in FIG. After passing a predetermined position, the convex portion 14d of the stop lever 14 separates from the front end of the shelf board 2, and the end projecting piece 14A of the stop lever 14 comes into contact with the shelf board. When the unit frame 5 is further pulled out, as shown in FIG.
It hits collar 17 and cannot be pulled out any further. Therefore, it is possible to prevent the unit frame 5 from stopping in the middle of being pulled out and from accidentally falling off.

In order to pull out the unit frame 5 from the state shown in FIG. Push the unit frame 5 in (distance equal to or greater than the difference in diameter), then insert both hands into the lower surfaces of both sides of the unit frame 5, and press the flange 5a.
Grasp and hold the part. In this case, both hands will inevitably push up the convex portion 14d of the stop lever 14. This convex portion 14d is formed in a region that includes the part where the hand is placed when holding the unit frame 5, that is, the center of gravity of the unit frame 5.
Therefore, the stop lever 14 rotates around the screw 16, the protruding piece 14A at the tip rises, and the stopper surface 14b separates from the head of the screw 18.
Thereby, the unit frame 5 can be removed from the board frame 1 by simply pulling it out.

FIG. 4 shows the operation of the stop lever 14 when inserting the unit frame 5. First, the fourth
As shown in Figure a, connect the back of the unit frame 5 to the shelf board 2.
put it on. Subsequently, push in the unit frame 5.
At this time, as shown in FIG. 4b, the tip of the stop lever 14 comes across the screw 18, but the overhang piece 14
Since a tapered surface 14a is formed at the tip of A, as shown in FIG. 4c, the stop lever 1
The tip of the screw 4 can get over the head of the screw 18 without any problem. Therefore, the unit frame 5 can be smoothly inserted by simply pushing it in, and the state shown in FIG. 1 is automatically achieved.

In this way, when inserting or removing the unit frame 5, the mechanism for preventing the unit frame 5 from coming off by the stop lever 14 and the screw 18 can be released and set without any special operation.

In the above description, it is preferable that the stop levers 14 be provided on both sides of the unit frame, but if the weight is small, such as a small capacity unit, the stop levers 14 may be provided only on either the left or right side.

[Effect of idea]

As explained above, in the present invention, a stopper made of screws or the like is provided protrudingly in front of the side of the shelf board of the panel frame, and a stopper made of a screw or the like is provided on the rear part of the stop lever rotatably provided on the unit frame, when the unit frame is pulled out. A stopper surface whose front part engages with the stopper is connected, and an overhanging piece provided with a tapered surface that goes over the head of the stopper when the unit frame is inserted is connected to the stopper, and a stopper surface is formed on the lower surface of the center of the stopper lever than the bottom surface of the unit frame. It has a configuration in which a convex portion that projects downward is formed. Therefore, when taking out the unit frame, it is possible to release the engagement between the stop lever and the stopper by simply holding the unit frame with both hands. This completes the preparation for the drawer and allows you to take it out as you like. Further, when inserting the unit frame, the engagement state between the stop lever and the stopper is automatically set by simply pushing the unit frame. Therefore, while being equipped with a mechanism to prevent the unit from suddenly popping out or falling when pulled out,
The pulling out and insertion operations can be performed without requiring any special operations such as releasing or setting the locking prevention mechanism.

[Brief explanation of the drawing]

Figure 1 is a side view showing the main parts of the present invention, Figure 2 is a front view of the main parts of the invention, Figure 3 is a side view showing the state in which the unit is prevented from falling off when it is pulled out, and Figure 4 is when it is inserted. 5 and 6 are a cross-sectional plan view and a front view of a switchboard to which the device of the present invention is applied. 1...Panel frame, 2...Shelf board, 2a...Guide frame, 3, 4...Door, 5...Unit frame, 5a...
...Brim portion, 5b...Square hole, 5c...Grip hand, 7...
...Power contact, 8...Load contact, 9...Contact mounting frame, 10...Bus bar, 11...Load side terminal, 14...Stop lever, 14A...Overhang piece, 14a...Tapered surface, 14b... Stopper surface, 14c... Guide protrusion, 14d... Convex portion,
14e... Taper part, 14f... Base end part, 15,
17...Color, 16,18...Screw.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A stopper is provided at the front of the side of a shelf board that partitions a unit storage area within the panel frame and projects from the top of the shelf board, and a stopper is provided on the side of the unit frame on which electrical equipment is mounted. The front part of the stop lever is rotatably attached to the stop lever, and the rear part of the stop lever has a stopper surface whose front part engages with the stopper when the unit frame is pulled out, and a tapered surface that goes over the head of the stopper when the unit frame is inserted. A device for inserting and removing an electrical equipment unit, characterized in that a side projecting piece is provided, and a convex portion is formed on the lower surface of the center of the stop lever, the convex portion projecting downward from the bottom surface of the unit frame. 2. The insertion/removal device for an electrical equipment unit according to claim 1, wherein the stopper is constituted by a screw attached to the shelf board through a stop collar.