JP2009266554A - Push-button switch for emergency stop - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shutter opening/closing mechanism of a simple structure surely opening/closing a shutter by being operatively connected to pressing/twisting operations of a push button. <P>SOLUTION: Locking holes 2b and 3a are formed oppositely to each other on circumferential surfaces of a push button 2 and a bezel 3 attached to a frame 1, respectively; thereafter a shutter member 7 is arranged inside the locking holes; an opening/closing guide 9 arranged on the circumference of the shutter member as an opening/closing mechanism of the shutter member 7 is fitted in a guide groove 2c formed on a circumferential wall of the push button 2, and axially movably guided and supported; thereafter the opening/closing guide is provided with a lock pin 11 spring-energized to project toward the frame; and the frame 1 is formed, oppositely to the lock pin, with a stopper part 1b engageably holding the shutter member to the closing position at a wait position of the push button 2, an opening guide cam part 1c moving the shutter member to the opening position in operating a push lock operation of the push button, and a restoration guide cam part 1d moving the shutter member from the opening position to the closing position by a turn reset operation of the push button. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a push-lock / turn-reset type emergency stop pushbutton switch that is installed in a control panel, distribution board, etc., and more specifically, an unexpected reset operation can be performed by locking the pushbutton at the lock position of the switch. The present invention relates to a locking mechanism with a shutter that is prevented.

  As is well known, the emergency stop pushbutton switch mentioned above is forcibly disconnecting the load (mechanical equipment) power supply circuit by pressing the pushbutton (trigger action) in an emergency emergency and pressing the pushbutton once. This 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 released after the switch is operated. Install it on a panel such as an electrical panel.

  In addition, as a reset method for returning the emergency stop pushbutton switch from the lock position to the standby (normal) position, a pull reset method for pulling back the pushbutton and a turn reset method for returning the pushbutton by twisting (for example, patents) From the standpoint of ensuring safety, push-lock / turn-reset type emergency stop pushbutton switches having a high malfunction prevention function are widely used.

  By the way, even if the load is stopped by pushing the emergency stop pushbutton switch, if the maintenance staff or a third party accidentally resets the emergency stop pushbutton switch during the inspection of the mechanical equipment, There is a danger that accidents such as electric shocks may occur due to the maintenance of (mechanical equipment) and the maintenance staff working.

  Therefore, conventionally, a lockable protective cover (erroneous operation prevention cover) that covers the push button is attached to the operation unit, or a cylinder lock is provided on the push button so that the switch cannot be reset unless the key is inserted and unlocked. Or use a keyed switch. However, since the erroneous operation prevention cover is a separate part from the switch body, it is necessary to secure an installation space for the cover on the panel side. In addition, since the switch with key has one unlocking key (one type), it cannot be used when multiple maintenance personnel working on site want to secure double and triple safety by holding each key. There's a problem.

On the other hand, as a countermeasure against the above-mentioned problem, a bezel surrounding the outer periphery of the push button is additionally provided in the operation part of the emergency stop push button switch, and then the peripheral wall of the bezel and the lock that allows a lock hook to pass through the peripheral wall of the push button. Open the hole and rotate the push button in the circumferential direction at the switch lock position where the push button is operated to move so that the lock hole of the push button overlaps with the lock hole of the bezel. There is known an emergency stop pushbutton switch in which a lock (for example, a padlock) is hung on the lock hole so that the pushbutton can be locked in a locked position (see Patent Document 2).
Japanese Patent Laid-Open No. 2003-178743 JP 2006-049176 A

  In the emergency stop pushbutton switch disclosed in Patent Document 2, the standby position of the pushbutton and the locking hole opened in the pushbutton and the bezel are shifted in advance in the circumferential direction in the middle of the push operation. The push button is pushed to the end position and the push button is rotated in the circumferential direction at the lock position where the contact of the switch portion is switched, so that both the locking holes are overlapped and matched with each other. As a result, locking by the lock can be performed at the lock position of the pushbutton switch, and in other operation states, it is possible to prevent the lock from being locked by being locked.

  By the way, the emergency stop pushbutton switch is configured such that the pushbutton is twisted so that the locking hole opened on the peripheral surface of the bezel and the locking hole opened on the peripheral surface of the pushbutton do not overlap each other at the pushbutton standby position. There are structural restrictions that are formed so as to be shifted in the circumferential direction within the range of the operation angle (usually 45 degrees), and therefore, the width of each locking hole is limited and cannot be widened. For this reason, when hooks such as padlocks are inserted through the locking holes to lock the lock, there is inconvenience that the operation is difficult to perform, and even when the lock is locked in the lock hole, the movement of the lock is remarkably restricted. Therefore, there is a problem in usability such that it becomes difficult to change the direction of the lock freely during locking and unlocking and to turn the key in a direction in which it can be easily inserted.

  In addition, the push-button lock mechanism of the push-lock / return reset type push-button switch for emergency stop disclosed in Patent Document 1 pushes the push button in the axial direction during the push-lock stroke, and does not rotate in the circumferential direction as it is. Therefore, the emergency stop pushbutton switch is disclosed in Patent Document 2 described above. The locking method cannot be applied as it is.

  The present invention has been made in view of the above points, and the lock hole provided in the operation portion of the switch is widened in the circumferential direction so that the lock can be hooked on the push button at the lock position, thereby locking, locking, and unlocking the lock. The lock management function has been enhanced by making it possible to work easily and at the same time the shutter member attached to this lock hole can be accurately opened and moved to the closed position in conjunction with push-button push lock and turn reset operations. An object is to provide an emergency stop pushbutton switch with a shutter.

In order to achieve the above object, according to the present invention, a cap-shaped push button that is spring-biased to a standby position via a return spring and a peripheral area of the push button are enclosed at the front portion of the switch operation portion. A pushbutton for driving a contact, which is connected to the pushbutton via a trigger spring and inserted into the frame of the operation portion, and is pushed between the frame and the pushrod from the front. Is a push-lock / turn-reset type emergency stop push-button switch having a lock mechanism that locks the lock in a locked position and releases the lock by twisting the push button, and the bezel and the peripheral wall of the push button A lock hole for inserting and locking the lock hook to the inside and opening is opened facing the inside and outside, and the lock hole is interlocked with the push lock and turn reset operation of the push button on the inner periphery side. In those deployed shutter member for opening and closing,
As an opening / closing mechanism for the shutter member, an opening / closing guide is provided on the periphery of the shutter member, and the opening / closing guide is inserted into a guide groove formed on the peripheral wall of the push button to guide and support the shutter member so as to be movable in the axial direction. The opening / closing guide is provided with a lock pin that is spring-biased so as to protrude toward the frame, and the shutter member is engaged and held at the closed position of the push button on the frame facing the lock pin. And a stopper portion that is disengaged at the lock position by a push-lock operation of the push button, and the shutter member is moved to the open position by receiving the biasing spring force of the lock pin from the state in which the engagement with the stopper portion is released. An opening guide cam portion to be moved, and a reset operation for moving the shutter member from the opening position to the closing position via the lock pin by a turn reset operation of the push button. Forming a guide cam section (claim 1).

  According to the above configuration, since the locking holes that open to the peripheral wall of the push button and the peripheral wall of the bezel are arranged so as to face each other inside and outside, without being restricted by the twist angle in the reset operation of the push button, Each locking hole can be opened by being sufficiently widened in the circumferential direction. As a result, the lock hook can be easily inserted into the lock hole and locked, and the lock can be easily changed even when the lock is hooked on the lock hole. Unlocking work can be done easily, improving usability and convenience.

  In addition, by providing a shutter member that opens and closes the locking hole in conjunction with push-button push-lock and turn-reset operations, the lock management function can be enhanced compared to a structure without a shutter. The mechanism comprises a lock pin of an opening / closing guide provided on the shutter member, and a stopper portion, an opening guide cam portion, and a return guide cam portion formed on the operation portion frame so as to face the lock pin. A simple and compact mechanism with a pin as a core part enables the shutter member to be accurately moved to the open and closed positions in conjunction with push-button push-lock and turn reset operations.

  In addition, the shutter member and the shutter opening / closing mechanism described above are, as in the above-mentioned patent document 1, a push that engages in the lock position as it is without rotating the pushed button in the circumferential direction in the push-lock stroke of the switch. It can be applied to the emergency stop pushbutton switch of the lock / turn reset system without changing the basic structure and operation function of the switch including the lock mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the illustrated examples. 1 is an exploded perspective view of the push button switch for emergency stop, and FIGS. 2 to 5 are perspective views of the switch corresponding to the standby state of the push button, in the middle of the push lock operation, in the middle of the lock and turn reset operation, 6 to 8 are diagrams illustrating the operation of the push button lock mechanism and the shutter opening / closing mechanism corresponding to each state of the push button standby, push lock operation, and lock, respectively, and FIG. 9 shows a lock on the switch hole. FIG. 1 is a perspective view showing a locked state, and in FIGS. 1 to 8, the end face of a push button arranged at the front of the switch is drawn upward.

  In FIG. 1, 1 is a frame of the switch operation unit, 2 is a push button arranged at the front of the frame 1, 3 is a cylindrical bezel surrounding the periphery of the push button 2 and screwed to the frame 1, and 4 A return spring (torsion coil spring) 5 interposed between the frame 1 and the push button 2 is a push rod connected to the inner cylinder portion 2a (see FIG. 6) of the push button 2 with a trigger spring 6 interposed therebetween. A contact mechanism (not shown) is incorporated in a small-diameter cylindrical portion extending to the rear portion of the frame 1, and the tip of the push rod 5 is connected to the contact mechanism using the push bar 5 as an actuator. In addition, each said part is comprised with the resin mold goods except for some metal parts.

  Here, a rib-shaped guide 5 a formed along the axial direction on the outer peripheral surface of the push bar 5 and engaging claws 5 b and 5 c are formed on the upper and lower sides, and then the guide 5 a is attached to the inner cylinder 2 a of the push button 2. They are connected to the formed axial guide grooves so as to be relatively movable only in the axial direction. Further, the square hole opened on the lower peripheral surface of the push bar 5 is provided with a lock tip 8 that is pressed by a spring from the inside and biased so as to protrude from the outer peripheral surface as described later. It is made to oppose the convex stopper 1a formed along the surrounding surface. The convex stopper 1a has a circumferential extension length in accordance with the twisting angle of the push button 2. When the push button 2 is twisted in the circumferential direction when the switch is reset, The lock tip 8 rubs through the cut of the ridge stopper 1a to release the engagement with the push bar 5.

  The structure of the switch described above is basically the same as the emergency stop pushbutton switch disclosed in Patent Document 1, and the push lock / turn reset operation is described in detail in Patent Document 1.

  Further, the emergency stop pushbutton switch of the illustrated embodiment has a lock such as a padlock on the pushbutton 2 (see FIG. 9) to lock the pushbutton 2 and the bezel 3 on the peripheral surface. Has locking holes 2b and 3a for latching the lock, and a groove 1e communicating with the locking holes 2b and 3a is formed on the peripheral surface of the frame 1. The locking hole 3a opened in the bezel 3 is formed by a pair of left and right rectangular holes opened at intervals in the circumferential direction, whereas the pressing hole formed facing the inner side of the locking hole 3a. The locking hole 2b of the button 2 and the concave groove 1e of the frame 1 are set so as to extend over a pair of left and right locking holes 3a formed in the bezel 3. Further, the push button 2 and the bezel 3 can be provided with a plurality of sets of locking holes arranged on the circumference, and in the illustrated embodiment, two sets of locking holes are provided to be assigned to both the left and right side surfaces of the switch operating portion.

  On the other hand, a cylindrical shutter member 7 that opens and closes the locking holes 2b and 3a in conjunction with the push lock / turn reset operation of the push button is provided between the frame 1 and the push button 2 on the inner peripheral side of the push button 2. Has been deployed. Further, the shutter member 7 is provided with an opening / closing guide 9 on the circumference, and a lock pin 11 that is pressed and urged to protrude to the inner circumference side via a compression coil spring 10 on the spring seat 9a as follows. In the assembled state of the switch, the spring receiving seat 9a protruding from the outer periphery of the shutter member 7 is fitted into a shutter guide groove 2c formed on the peripheral surface of the push button 2 in the axial direction. The guide is supported to be movable.

  That is, a stopper portion 1b, an opening guide cam portion 1c, and a return guide cam portion 1d are formed on the outer peripheral surface of the frame 1 so as to face the lock pin 11 to constitute a shutter opening / closing mechanism, and the push button 2 is pushed. The shutter member 7 is controlled to move to the open / close position in conjunction with the lock / turn reset operation. Here, the stopper portion 1b is a convex stepped portion that bulges from the peripheral surface of the frame 1 as shown in the cross-sectional view of FIG. 6 (b). A tapered opening guide cam portion 1c inclined downward in the drawing is formed so as to be gradually reduced, and a tapered shape inclined upward in the circumferential direction is formed on the side of the opening guide cam portion 1c. A return guide cam portion 1d is formed.

  Next, each operation state of the emergency stop pushbutton switch having the above-described configuration will be described with reference to FIGS. 2 to 5 and FIGS. 6 to 8. 6 to 8, (a) and (b) show cross-sectional views of the internal mechanism taken along arrows XX and YY in FIG. 1, respectively.

  First, FIG. 2, FIG. 6 (a), (b) represents the standby (normal) state of the emergency stop pushbutton switch, and the pushbutton 2 protrudes forward of the frame 1 under the spring force of the return spring 4. Yes. In this standby state, the push bar 5 connected to the push button 2 via the engaging claw 5b moves forward to hold the contact mechanism (b contact) in the closed position. Further, as shown in the drawing, the locking hole 2b opened to the push button 2 is shifted so as not to match the locking hole 3a of the bezel 3, and the shutter member 7 is positioned to close the locking hole 3a as described below. It is latched and held.

  That is, as shown in FIG. 6B, in the standby state, the lock pin 11 provided on the shutter member 7 receives a spring force and abuts and engages with the convex step portion of the stopper portion 1b formed on the frame 1. At this position, the shutter member 7 is held at the closed position. In this standby state, the engaging claw 5c formed at the rear end of the push bar 5 engages with a stopper 1f formed on the inner peripheral wall surface of the frame 1 and is held in this position.

  Next, when the push button 2 is pushed from the standby state, immediately before reaching the lock position, the lock hole 2b and the bezel 2 of the push button 2 as shown in FIGS. 3 and 7 (a) and 7 (b). 3 and the recessed groove 1e of the frame 1 are matched in the inside and outside, but the shutter member 7 is still engaged and held in the same closed position as in the standby state. In this state, the locking hole of the bezel 3 3a cannot be locked.

  When the push button 2 is further pushed in from the position shown in FIG. 3, the trigger spring 6 (the spring constant of the trigger spring 6 is smaller than that of the return spring 4) is compressed to push the push rod 5 in the axial direction. On the other hand, as shown in FIG. 8 (a), the push bar 5 that has received this pressing force gets over the stepped portion of the ridge stopper 1a of the frame 1 and is locked at the lock position. The contact (b contact) of the contact mechanism whose front end is built in the rear end of the frame 1 is opened.

  Further, when the push button 2 is pushed into this locked position, the spring seat 9a of the open / close guide 9 which is fitted and supported by the guide groove 2c (see FIG. 1) is pushed in the axial direction. As a result, the lock pin 11 (see FIG. 7B) that has been latched and held by the stopper portion 1b of the frame 1 thus gets over the stopper portion 1b of the frame 1 and releases the latch of the shutter member 7. At the same time, the spring force of the compression coil spring 10 is applied along the inclined cam surface of the open guide cam portion 1c to the lock pin 11 that has moved over the convex stopper portion 1b and moved to the open guide cam portion 1c behind it. Thereby, the shutter member 7 moves backward together with the lock pin 11 from the closed position as shown in FIGS. 8A and 8B to completely open the lock holes 2b and 3a.

  In this state, as shown in FIG. 9, padlocks 12 and scissor locks 13 (locking aids corresponding to a plurality of padlocks) are provided in the lock holes 2b and 3a that are opened to the left and right on the peripheral surfaces of the push button 2 and the bezel 3. The hooks 12a and 13a are inserted and latched, and a plurality of locking holes opened in the scissor lock 13 can be hooked with a padlock to be locked multiple times. In this case, since the locking holes 2b and 3a are wide in the circumferential direction as described above, the hooking operation before the lock can be performed easily. Even when the hooks 12a and 13a are hooked in the lock holes 2b and 3a, the lock can be moved in a wide range so that the lock and unlock operations can be easily performed.

  Thus, in a state where the emergency stop pushbutton switch is push-locked and the mechanical equipment is forcibly stopped, a maintenance worker inspecting the mechanical equipment locks the pushbutton 2 and the bezel 3 with a lock as shown in FIG. By doing so, it is possible to reliably prevent a switch reset operation by a third party other than the parties.

  Next, the operation at the time of turn reset operation of the emergency stop pushbutton switch will be described. That is, after unlocking the lock (padlock 12, scissor lock 13) from the locked state of FIG. 9 and removing it from the locking hole 3a of the bezel 3, the push button 2 is moved in the direction of the arrow (clockwise) in FIG. When the 45 ° manual twisting operation is performed, the push bar 5 rotates in the circumferential direction together with the push button 2, and the lock tip 8 protruding from the circumferential surface of the push bar 5 rubs the cut of the convex stopper 1 a formed on the frame 1. The engagement of the push bar 5 is released. Thereby, the push button 2 and the push bar 5 receive the spring force of the return spring (torsion coil spring) 4 and move forward from the lock position (see FIG. 4) to reset the contact mechanism, and the push button 2 Return to the standby position in FIG. Further, when the push button 2 is twisted in the direction of the arrow in accordance with the turn reset operation of the switch, the shutter member 7 rotates together with the push button 2 in the clockwise direction. As a result, the lock pin 11 provided on the open / close guide 9 moves from the end of the open guide cam portion 1c formed on the frame 1 to the return guide cam portion 1d and is pushed and guided forward along the inclined cam surface. The shutter member 7 also moves from the open position shown in FIG. 8 to the closed position shown in FIG. 2 and returns to the standby state.

The exploded perspective view of the pushbutton switch for emergency stop by the Example of this invention FIG. 1 is an external perspective view showing a standby state of a push button with the switch of FIG. FIG. 1 is an external perspective view showing a state during the push-lock operation of the push button with the switch of FIG. FIG. 1 is an external perspective view showing a push button locked state by the switch of FIG. 1 is an external perspective view showing a state during a turn reset operation of a push button with the switch of FIG. FIGS. 3A and 3B are operation explanatory views of a push button lock mechanism and a shutter opening / closing mechanism corresponding to FIG. 2, and FIGS. 1A and 1B are cross-sectional views taken along arrows XX and YY in FIG. FIGS. 4A and 4B are operation explanatory views of a push button lock mechanism and a shutter opening / closing mechanism corresponding to FIG. 3, and FIGS. 1A and 1B are cross-sectional views taken along lines XX and YY in FIG. FIGS. 5A and 5B are operation explanatory views of a push button lock mechanism and a shutter opening / closing mechanism corresponding to FIG. 4, and FIGS. 1A and 1B are cross-sectional views taken along arrows XX and YY in FIG. FIG. 4 is an external perspective view showing a state in which the lock is hooked on the lock hole in the locked state of FIG.

Explanation of symbols

1 Frame 1b Stopper 1c Opening Guide Cam 1d Return Guide Cam 2 Push Button 2b Locking Hole 3 Bezel 3a Locking Hole 4 Return Spring 5 Push Rod 6 Trigger Spring 7 Shutter Member 8 Lock Tip 11 Lock Pin

Claims (1)

A cap-shaped push button that is spring-biased to a standby position via a return spring and a bezel that surrounds the peripheral area of the push button are provided at the front of the switch operation unit, and the push button is provided with a trigger spring. After inserting the contact driving push rod connected to the frame of the operation section, the push button pushed from the front is locked at the lock position between the frame and the push rod, and the push button is twisted. A push-lock / turn-reset type emergency stop pushbutton switch having a lock mechanism that releases the lock by the bezel, and a locking hole for engaging and locking the lock hook on the peripheral wall of the bezel and the pushbutton. A shutter member that opens to the inside and outside and has a shutter member that opens and closes the locking hole in conjunction with the push lock and turn reset operation of the push button is provided on the inner circumference side thereof.
As an opening / closing mechanism for the shutter member, an opening / closing guide is provided on the periphery of the shutter member, and the opening / closing guide is inserted into a guide groove formed on the peripheral wall of the push button to guide and support the shutter member so as to be movable in the axial direction. The opening / closing guide is provided with a lock pin that is spring-biased so as to protrude toward the frame, and the shutter member is engaged and held at the closed position of the push button on the frame facing the lock pin. And a stopper portion that is disengaged at the lock position by a push-lock operation of the push button, and the shutter member is moved to the open position by receiving the biasing spring force of the lock pin from the state in which the engagement with the stopper portion is released. An opening guide cam portion to be moved, and a reset operation for moving the shutter member from the opening position to the closing position via the lock pin by a turn reset operation of the push button. Emergency stop switch, characterized in that to form a guide cam portion.

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