JPH0720323B2 - Drawer for switchgear of closed switchboard - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a drawer device for an opening / closing device which is housed in a closed switchboard or the like.

[Technical Background of the Invention and Problems Thereof] Many switchgear devices housed in a closed switchboard or the like are designed so that they can be freely moved in and out to facilitate operation and maintenance. As a drawer device that allows the opening / closing device to be freely taken in and out, conventionally, various structures having various structures have been put to practical use or proposed, and are known. Hereinafter, a typical example of this will be described with reference to the drawings. 7 is a front view showing a state in which the movable switchgear 1 is housed in a closed box 2 of a switchgear switchboard and is in a disconnection position, and FIG. 8 is seen in the direction of arrow A in FIG. FIG. 9 is a side view of FIG. 9, and FIG. 9 is an explanatory view showing a state in which the switchgear 1 is further moved from the disconnection position shown in FIG.

First, the operation of moving the switchgear 1 from the disconnection position shown in FIG. 8 to the connection position shown in FIG. 9 will be described. The lever 3 is constantly subjected to a force by the compression spring 4 in a direction opposite to the direction in which the operation handle 5 is inserted (indicated by an arrow in FIG. 8). The operation handle 5 is inserted into the lever 3 and attached to the rotary arm 6. Thereafter, the release lever 7 is operated to remove the stopper 8 which fixes the opening / closing device 1 at the disconnection position, and at the same time, the rotating arm 6 is rotated by the operation handle 5. The torque of the rotating arm 6 is transmitted to the drive cam 10 via the link 9. The drive cam 10 engages with a drive pin 11 fixed to the opening / closing device 1 to move the opening / closing device 1 to the connection position.

Next, the operation of moving the switchgear 1 from the connection position to the disconnection position may be performed in the reverse order of the above. 8 and 9, reference numeral 13 is a front door of the closed box 2, reference numerals 1a and 1b are outlet terminals of the switchgear 1, and reference numerals 2a and 2b are conductors provided in the closed box 2, respectively.

By the way, in the above operation, when the switchgear 1 is in the closed state for the sake of operator's safety, the switchgear 1 is prevented from moving to the connecting position or from the connecting position to the disconnecting position. Therefore, conventionally, when the operation handle 5 is attached to the rotary arm 6, the limit switch 12 is operated by the lever 3 and the limit switch 12 is operated.
The switchgear 1 is electrically opened by the contact point.

However, since this method is operated electrically, the opening / closing device 1 may not be opened even if the operation handle 5 is attached, if the control circuit is powered off for some reason. Further, in this type of drawing device, the operation handle 5 can be arbitrarily attached, so that if the operator mistakenly inserts the operation handle 5, there is the inconvenience of stopping a device which is troublesome to stop. There was a latent cause to occur.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drawer device for a switchgear of a closed switchboard that can be operated safely and reliably.

[Summary of the Invention] A drawer device for a switchgear of a closed switchboard according to the present invention includes a rotary arm that is rotatably attached to a closed box and has a protrusion to which an operation handle is detachably mounted, and a rotary arm. A drive cam that is connected and moves the opening / closing device, a shield member that is movably attached to the closed box, and that shields the tip of the protrusion of the rotary arm at all times, and a rotatable member that is provided at the end of the shield member. Is provided with an electromagnet that engages via a roller and a lock member composed of a lever, and the movement of the shielding member is restrained by the lock member when the opening / closing device is closed. It was designed to prevent accidental movement of the.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings, illustrating an embodiment of a drawer device (hereinafter referred to as a drawer device) for a switchgear of a closed switchboard according to the present invention. FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a side view seen in the direction of arrow A in FIG. The seventh
The same parts as those in FIG. 8 and FIG. 8 are designated by the same reference numerals, and the duplicated description will be omitted. The pull-out device 20 is rotatably attached to a base 21 fixed to the side wall of the closed box 2 via a fixing pin 22, and has a protruding portion that can be fitted to the concave portion of the operation handle 5 on the tip side.
The rotation arm 23 provided with 23a and the long hole 24a in the fixed pin 22.
And a lever 24 provided with a guide portion 24d having a square hole 24c through which the protruding portion 23a penetrates by bending an end portion on one side into an L shape and protruding the rotating arm 23. The compression spring 25, which is inserted into the portion 23a and constantly pushes the lever 24 to move outward, and the elongated holes 27a and 27a, which are inserted into the fixing pins 26 and 26 provided on the base 21, are movable in the horizontal direction. An abutment surface 27 that abuts on a roller 28 that is attached and is rotatably attached to the other end of the lever 24 and extends vertically.
It is attached to the lever 27 provided with b, the fixing pin 26 and the lever 27, and the tension spring 29 that constantly acts to move the lever 27 to the lever 24 side, and the base 21 that is attached integrally to the lever 27. When the limit switch 31 that engages with the operation plate 30 and operates and the lever 27 moves beyond the moving distance for operating the limit switch 31, the plunger 27 is attached to the other end of the lever 27 as shown in FIG. The base 32 and the electromagnet 32 that abut 32a to prevent further movement of the lever 27.
It has a notch 33a that is rotatably attached to 21 and engages with the drive pin 11 of the switchgear 1, and is composed of a drive cam 33 that is connected to the rotary arm 23 by a link 34.

The tip of the above-mentioned protruding portion 23a of the rotary arm 23 slightly enters the square hole 24c of the lever 24 as shown in FIG. Further, the electromagnet 32 includes a contact 35 that opens when the switchgear 1 is closed and a limit switch 31 to avoid continuous excitation of the electromagnet coil as shown in FIG.
The electromagnet coil 32b is excited by the control power supply PN via the series circuit of the contacts 36 which are closed when is operated.

Next, the operation of the drawer device having the above configuration will be described. First, when the switchgear 1 is moved (advanced) from the disconnection position to the connection position, the lever 24 is pushed in to expose the protruding portion 23a of the rotary arm 23 to the outside of the lever 24 as shown in FIG.
Insert the recess of the operation handle 5. Then, the operation handle 5 is rotated counterclockwise in FIG. The chain double-dashed line in the figure shows the state after rotation. This rotation causes the drive cam 33 to rotate counterclockwise in the figure via the link 34 (the two-dot chain line in the figure shows the state after the rotation), so that the drive cam 33 opens and closes via the drive pin 11. The device 1 has an arrow 37 in FIG.
Move in the direction indicated by. The two-dot chain line in the figure shows the position after the movement, and this position is the connection position of the switchgear 1.

Further, by pushing the lever 24, the lever 27 is pushed through the roller 28 and moved in the direction indicated by the arrow 38 in FIG. In this movement, if the switchgear 1 is opened, the contact 35 shown in FIG. 5 is closed and the contact 36 is also closed when the limit switch 31 is operated by the movement of the lever 27, so that the electromagnet coil 32b is closed. Excited, always third
The plunger 32a at the position indicated by the solid line in the figure is sucked and rises to the position indicated by the chain double-dashed line. Therefore, the lever 27 can move from the position indicated by the solid line in the figure to the position indicated by the alternate long and two short dashes line.
That is, the operation handle 5 can be completely rotated,
The switchgear 1 can be moved to the above-mentioned connection position. However, when the switchgear 1 is closed, the electromagnet coil 32b is not excited and the plunger 32a is not attracted even if the limit switch 31 is operated by moving the lever 27. Therefore, the lever 27 has a plunger 32 at the end.
It comes into contact with a and is prevented from moving any further. Therefore, the protruding portion 23a of the rotating arm 23 is not exposed to the outside of the lever 24,
It becomes impossible to insert the operation handle 5 into the protruding portion 23a. Therefore, the rotary arm 23 by the operation handle 5
Therefore, the switchgear 1 cannot be moved to the connection position.

Next, when the switchgear 1 at the connection position is moved (retracted) to the disconnection position, the lever 24 which is rotating to the position indicated by the chain double-dashed line in FIG. 23a
Is exposed to the outside of the lever 24 and the recess of the operation handle 5 is fitted. Then, operate the operation handle 5 in the opposite direction (second
The drive cam 33 is rotated from the state of the two-dot chain line in the figure to the state of the solid line in the figure. By this rotation, the opening / closing device 1 is moved in the direction opposite to the arrow 37 in FIG. 1 via the drive pin 11. That is, the switchgear 1 is moved to the disconnection position. Also in this case, when the switchgear 1 is closed, the electromagnet coil 32b is not excited and the plunger 32a is not attracted in the same manner as described above, so that the lever 27 is prevented from moving to the plunger 32a. Therefore, in the same manner as described above, the concave portion of the operation handle 5 is inserted into the protruding portion 23a of the rotary arm 23.
The switchgear 1 cannot be moved to the disconnection position.

Therefore, with the above configuration, the protruding portion 23a of the rotary arm 23 on which the operation handle 5 is mounted is shielded by the lever 24 when the switchgear 1 is closed, so that the switchgear 1 is accidentally moved. Can be prevented,
Although the lever 24 rotates together with the rotating arm 23, since the lever 24 is engaged with the lever 27 via the rotatable roller 28, a force from an arbitrary direction is transmitted to the lever 27 without difficulty during this rotation. Easy to operate.

In the above-described embodiment, the drawer is mounted inside the closed box, but the storage unit of the opening / closing device and the drawer may be integrated into a unit, and this unit may be mounted inside the closed box.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to safely and reliably operate the movement between predetermined positions in the closed box, and it is possible to erroneously stop the device in operation. Absent.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a drawer device for a switchgear of a closed switchboard according to the present invention, FIG. 2 is a side view seen in the direction of arrow A in FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a side view showing an essential part of an example, FIG. 4 is a plan view showing another essential part different from FIG. 3 of an embodiment of the present invention, and FIG. 5 is an exciting circuit of an electromagnet of an embodiment of the present invention. FIG. 6 is a circuit diagram, FIG. 6 is an explanatory view showing the operation of one embodiment of the present invention, FIG. 7 is a front view showing a drawer device of a switchgear of a conventional closed switchboard, and FIG. 8 is an arrow A in FIG. FIG. 9 is a side view seen in the direction, and FIG. 9 is an explanatory view showing the action of the drawer device of the conventional opening / closing device. 1 …… Opening / closing device, 2 …… Closed box 5 …… Operating handle 23 …… Rotating arm, 23a …… Projection 24,27 …… Lever, 32 …… Electromagnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Furunemura 1st in Toshiba Fuchu factory, Fuchu-shi, Tokyo (72) Inventor Nobuo Sekiguchi 1st Toshiba-cho, Fuchu, Tokyo Toshiba Fuchu factory, Ltd. (72) Inventor Noriyoshi Makoto, 1000 Hamada, Aboshi-ku, Himeji-shi, Hyogo, Nishishiba Electric Co., Ltd. (72) Hiroo Takechi 1000, Hamada, Aboshi-ku, Himeji-shi, Hyogo, Nishiba Electric Co., Ltd. (72) Inventor Ishihara Shinya 1000, Hamada, Aboshi-ku, Himeji-shi, Hyogo Nishiba Electric Co., Ltd. (56) References JP 59-132706 (JP, A) Actual 55-24095 (JP, U)

Claims (1)

[Claims] 1. A rotary arm rotatably attached to a closed box and provided with a protrusion to which an operation handle is detachably mounted, a drive cam connected to the rotary arm to move an opening / closing device, and A shield member that is movably attached to the closed box and that shields the tip of the protrusion of the rotary arm at all times, and an electromagnet and a lever that are engaged via a rotatable roller provided at the end of the shield member. And a lock member, wherein movement of the shielding member is restrained by the lock member when the switchgear is closed.