JP2009187870A - Locking device for emergency stop pushbutton switch - Google Patents

Abstract

[PROBLEMS] A new lock that functions as a switch guard for preventing malfunction in a normal state of an emergency stop pushbutton switch and locks the pushbutton to a lock position to prevent erroneous reset operation in a push lock state. Providing equipment.
A locking device 3 includes a base 4 which is fixed to the front surface of a mounting panel 1 with side walls 4a standing upright on both the left and right sides of the push button 2, and a push button which is guided and supported movably up and down along the left and right side walls of the base. And a locking hole 4b, 5b on the side wall of the base and the leg piece of the slider, and a protrusion formed on the peripheral surface of the push button on the top of the slider. The concave portion 5d is formed so as to face the portion 2a. In the push-lock state of the emergency stop pushbutton switch, the slider is pushed down so that the concave portion is fitted to the convex portion of the pushbutton peripheral surface. Lock through the padlock shackle across the lock hole.
[Selection] Figure 1

Description

  The present invention locks the push button to the locked position in the push-lock state of the emergency stop push-button switch equipped on the control panel, distribution board, etc., so that the unauthorized operation of resetting the push button by a third party cannot be performed. The present invention relates to a locking device for an emergency stop pushbutton switch.

  As is well known, the emergency stop pushbutton switch mentioned above forcibly disconnects the power supply circuit of the load (machinery equipment) by pushing the pushbutton (trigger action) in the event of an emergency or during maintenance and inspection of machinery and equipment. It is a push-lock type command switch with a safety lock function that holds the contact mechanism in the open position even after the push button is pushed once and then released. When equipped on an electrical panel, etc., the push button is projected to the front of the panel and the switch operating part is mounted on the panel mounting panel.

  In addition, as a reset method to return the push button switch for emergency stop from the push lock state to the original standby (normal) state, a pull reset method for pulling back the push button and a turn reset method for returning the push button by twisting operation (See, for example, Patent Document 1), and push-lock / turn-reset type emergency stop pushbutton switches are often used from the viewpoint of preventing malfunction.

  In addition, as an accessory (accessory) to prevent the emergency stop pushbutton switch from malfunctioning unexpectedly when it hits the pushbutton in the normal state and hits it, a guard fence is used to surround the pushbutton. Switch guards are also well known (see Non-Patent Document 1).

  On the other hand, if the emergency stop pushbutton switch is accidentally reset while the mechanical equipment is being inspected while the emergency stop pushbutton switch is being pushed to stop the load, It is extremely dangerous because there may be an accident related to the life of the worker who is inspecting at the site with the equipment) in operation.

Therefore, conventionally, a lockable button cover that covers the push button of the emergency stop push button switch is provided on the front surface of the mounting panel, and the button cover is moved in front of the push button in the push-lock state of the switch that is operated by pushing the push button. Some security measures have been adopted in order to prevent a third party other than the maintenance personnel working at the site from resetting the pushbutton without permission. Although the switch model is different from the emergency stop pushbutton switch, a configuration is known in which a button cover provided on the front of the panel is locked with a padlock to prevent button operation as a mechanism for preventing erroneous operation of the pushbutton switch. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 2003-178743 Japanese Patent Laid-Open No. 9-17291 (FIG. 5) FUJI ELECTRIC EQUIPMENT CONTROL CO., LTD. November 2005 Product Catalog “Fuji φ22 Command Switch AR22 Series SEMI Standard Guide Ring” [Search January 22, 2008] Internet <http://www.fujielectric.co.jp/ fcs / jpn / edc / catalog2 / AH325 / AH325.pdf>

  By the way, the above-described conventional malfunction and malfunction prevention device has the following problems. In other words, the switch guard has the effect of preventing the switch from malfunctioning unexpectedly when it hits the push button in the normal state or touches the hand, but it does not have the function to prevent the push reset operation of the push button. There is a problem in securing. In addition, the button cover that prevents erroneous resetting of the push button has the advantage of ensuring safety because the push button cannot be reset without permission by locking the button cover, but it has the advantage of ensuring safety, but it is mounted in front of the mounting panel in parallel with the push button. The button cover may become an obstacle and disturb the emergency push operation of the push button, which may delay the emergency stop of the load. Moreover, if the front surface of the push button is covered with a button cover, there is a problem that it is difficult to visually recognize the operation state of the switch with the illumination type push button.

  The present invention has been made in view of the above points. The structure of a switch guard used as an accessory for a pushbutton switch for emergency stop is changed, and a lock function is added thereto to perform a turn reset operation of the pushbutton. It is an object of the present invention to provide a locking device applied to a push-lock / turn-reset type emergency stop pushbutton switch that can be surely blocked.

In order to achieve the above object, the locking device of the present invention has a base that is fixed to the front surface of the mounting panel by raising side walls on both the left and right sides of the push button, and is guided and supported so as to be vertically movable along the left and right side walls of the base. It consists of a gate-shaped slider arranged above the push button, and has a locking hole in the side wall of the base and the leg piece of the slider, and faces the convex part formed on the peripheral surface of the push button at the top of the slider In the push-locked state of the switch, the slider is pushed down to fit the recess into the protrusion on the peripheral surface of the push button, and the padlock is straddled across the base and slider locking holes. It shall lock through a shackle (Claim 1), and can be specifically configured in the following manner.
(1) A guide elongated hole is formed in the left and right side walls of the base, and a fitting claw is formed in a leg piece of the slider, and the slider is guided and supported by moving the fitting claw into the guide elongated hole. 2).
(2) In the preceding item (1), the protruding height of the base side wall and the slider leg piece from the mounting panel surface is set lower than the height of the lock position of the push button.
(3) The base is interposed and fixed between the operation portion of the emergency stop pushbutton switch and the front surface of the mounting panel.

  With the above configuration, in the normal state of the emergency stop pushbutton switch, the assembly frame body of the base and the slider provided on the front surface of the mounting panel surrounding the outer periphery (left and right sides and upper side) of the pushbutton Like the switch guard, it acts as a guard that prevents the switch from accidentally malfunctioning when an object or hand hits the push button.

  On the other hand, when the push button is pushed during emergency maintenance and the push button switch for emergency stop is locked in the operating position, the slider is pushed down from above to hit the peripheral surface of the push button. The recess engages with the projection formed on the peripheral surface of the push button and engages with the push button, and the push button cannot be twisted from this position. Furthermore, by engaging the padlock across the lock hole drilled in the base and slider at the position where the slider is pushed down, unauthorized reset operation of the switch by a third party other than the working party can be reliably prevented. This ensures the safety of inspection work at the site. Moreover, since the front surface of the push button (illuminated type) is not covered like a button cover, the operation state of the emergency stop push button switch can be visually confirmed.

  Also, in an emergency emergency, the push button is often pushed with the palm of the hand without using the fingertip, but the protruding height of the base side wall and the slider leg piece from the mounting panel surface is determined by the height of the push button lock position. By setting it lower than this, the trigger action operation can be surely performed without obstructing the push operation of the push button.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In each figure, 1 is a control panel for mounting an emergency stop pushbutton switch, a mounting panel such as a distribution board, and 2 is a pushbutton provided on the switch operation part (push lock / turn reset method) (surface of the pushbutton) The arrow displayed in (3) indicates the twisting direction of the reset operation.) 3 is a locking device additionally provided according to the present invention.

  The locking device 3 is an assembly of a base 4 and a slider 5 (resin molded product). The base 4 has a mounting hole in the center of its plate surface, and is located between the front surface of the mounting panel 1 and the switch operating portion. Then, as shown in FIG. 3, the lock panel 7 is fastened together with the switch operation portion from the back side of the mounting panel 1 as shown in FIG. In FIG. 3, reference numeral 8 denotes a contact unit connected to the operation part of the push button.

  Here, the base 4 is formed with side walls 4a standing forward on the left and right side edges of the base plate. The side walls 4a face the left and right sides of the push button 2 as shown in the figure. Yes. Moreover, the side wall 4a is extended long downward, and the locking hole 4b which hangs a padlock on this extension part is drilled. As shown in FIG. 3, the protruding height h of the side wall 4a of the base 4 from the mounting panel 1 is the height retracted rearward from the lock position B where the push button 2 is pushed from the illustrated normal position A. Is set.

  On the other hand, the slider 5 has a gate shape (inverted U shape), and a locking hole 5b corresponding to the locking hole 4b of the base 4 is opened at the distal end side of the left and right leg pieces 5a. The leg pieces 5a are inserted between the base side walls 4 and supported so as to be slidable up and down as described below. That is, a guide elongated hole 4c is opened in the vertical direction on the side wall of the base 4, and a fitting claw 5c is formed on the leg piece 5a of the slider 5 so as to face the guide elongated hole 4c, and is fitted as shown in the figure. The pawl 5c is fitted into the guide slot 4c to guide and support the slider 5 so as to be slidable in the vertical direction. Note that the guide long hole may be formed in the leg piece of the slider 5 and the fitting claw may be formed in the side wall of the base 4. The inner peripheral surface of the slider 5 is an arc surface corresponding to the outer shape of the push button 2.

  Further, the push button 2 is formed with a convex portion 2a at the upper end position of the peripheral surface, and a concave portion 5d is formed on the top of the slider 5 so as to face the convex portion 2a.

  With the above configuration, in the normal state of the emergency stop pushbutton switch, the slider 5 of the locking device 3 is pulled up above the pushbutton 2 as shown in FIG. In this state, the assembly of the locking device 3 composed of the base 4 and the slider 5 functions in the same manner as a conventional switch guard (see Non-Patent Document 1), and the switch malfunctions when an object or hand hits the push button 2. To prevent.

  On the other hand, when the maintenance engineer inspects the equipment with the emergency operation of the push button 2 to stop the load (mechanical equipment), the slider 5 is pushed down in the direction of the arrow as shown in FIG. The concave portion 5d formed on the top is fitted to the convex portion 2a of the push button 2 stopped at the locking position, and the shackle of the padlock 9 is inserted into the locking hole 4b of the base 4 and the locking hole 5b of the slider 5 that overlap each other at this position. Lock through 9a. When the inspection work is performed by two maintenance personnel, each person hangs the padlock 9 separately on the left and right locking holes.

  In this locked state, the push button 2 has the convex portion 2a engaged with the concave portion 5d of the slider 5, and the slider 5 is locked to the base 4 with the padlock 9 at this position, and the convex portion 2a, the concave portion 5d, Cannot be disengaged. Therefore, unless the padlock 9 is unlocked, it is impossible to twist the push button 2 to reset the emergency stop push button switch, and to reliably prevent unauthorized reset operations by a third party other than the party. it can. When the equipment is restarted after the inspection work is completed, the padlock 9 is unlocked by using a key held by maintenance personnel, and the slider 5 is further lifted to the position shown in FIG. After canceling, perform a turn reset operation to return to the normal state.

1 is a structural diagram of a locking device according to an embodiment of the present invention, and a perspective view showing an unlocked state. The perspective view of the state which locked the locking device of FIG. Side view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting base 2 Pushbutton of emergency stop pushbutton switch 2a Convex part 3 Locking device 4 Base 4a Side wall 4b Locking hole 4c Guide long hole 5 Slider 5a Leg piece 5b Locking hole 5c Fitting claw 5d Concave

Claims (4)

A locking device for locking a push button of a push lock / turn reset type emergency stop push button switch mounted on a mounting panel with a push button facing the front of the panel in a locked position,
A base that is fixed to the front surface of the mounting panel with side walls standing upright on both the left and right sides of the push button, and a gate-shaped slider that is guided and supported in a vertically movable manner along the left and right side walls of the base. And a locking hole is formed in the side wall of the base and the leg piece of the slider, and a concave portion is formed on the top portion of the slider so as to oppose the convex portion formed on the peripheral surface of the push button. The emergency stop pusher is characterized in that the slider is pushed down so that the concave portion is fitted to the convex portion of the peripheral surface of the push button, and then locked through the padlock shackle across the lock hole of the base and the slider. Button switch locking device. 2. The locking device according to claim 1, wherein a guide long hole is formed in the side wall of the base, and a fitting claw is formed in the slider leg piece, and the fitting claw is fitted into the guide long hole to guide the slider to move up and down. An emergency stop pushbutton switch locking device characterized by being supported. The locking device according to claim 1 or 2, wherein the protruding height of the side wall of the base and the leg piece of the slider from the mounting panel surface is set lower than the height of the lock position of the push button. Locking device for pushbutton switch for stop. 2. The emergency stop pushbutton switch according to claim 1, wherein the base is sandwiched and fixed between the operation portion of the emergency stop pushbutton switch and the front surface of the mounting panel. Locking device.

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