JP2015170582A - Push button switch for emergency stop - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push button switch for emergency stop that can be surely prevented from being carelessly reset without being provided with another component such as a cover.SOLUTION: A push button 11 has a cylinder 15 in a cylindrical shape provided thereinside, and the cylinder and the push button are linked to each other so as to be freely rotatable mutually at a predetermined angle in a rotation direction and movable together in a shaft direction. On a peripheral wall of the cylinder and a peripheral wall of a bezel 13 surrounding the peripheral wall of the cylinder are correspondingly formed at least a pair of locking holes through which locks are passed. When the push button and the cylinder are placed on stand-by positions, a locking hole 15a of the cylinder and a locking hole of the bezel are positioned while being displaced from each other so as to disable insertion of the locks thereinto. When the push button is pushed into a pushed-in position by pushing-in operation, the cylinder is rotated by the predetermined angle, the locking hole of the cylinder and the locking hole of the bezel are positioned while being overlapped with each other, and the locks are inserted through the locking holes so that an operation part 1 can be locked at a lock position.

Description

  The present invention relates to an emergency stop pushbutton switch used to stop a load in an emergency.

The emergency stop pushbutton switch (hereinafter also simply referred to as a “pushbutton switch”) pushes the pushbutton in an emergency or during machine maintenance to force the load circuit to open and self-open. It has a function of holding (locking). As a method of returning (reset) the push-button switch that has been pushed in to the standby (waiting for operation) state, one that twists the push button (push lock / turn reset method) or one that pulls back the push button (push lock / pull reset method) (See Patent Document 1). In any case, if it is erroneously reset while the load is stopped, an accident related to human life may occur, which is extremely dangerous.
For this reason, a lockable protective cover (erroneous operation prevention cover) that covers the pushbutton portion of the operation is attached (see Patent Document 2), or a keyed switch that cannot be reset unless a key is inserted into the center of the pushbutton is used. ing.

In addition, there are some which are locked to the pushbutton of the pushbutton switch of the pushbutton switch as shown in Patent Documents 3 and 4 so that the reset operation cannot be easily performed.
In the first conventional example shown in Patent Document 3, a lock hole is provided in the peripheral wall of the bezel that supports the push button and the switch portion of the push button switch, the push button is moved in the pushing operation direction, and the contact mechanism is driven. Immediately after that, the push button itself is rotated so that the lock hole provided in the push button can be locked according to the lock hole of the bezel.

  In the second conventional example shown in Patent Document 4, a shutter that rotates in conjunction with the operation of the push button is provided in the gap of the push button of the push button switch, and the bezel and the push button coincide with each other in advance. The locking hole arranged at the position to be closed is closed with this shutter, the push button is pushed, and when the contact mechanism is opened and closed, the shutter is rotated to open the locking hole and make it possible for locking. is there.

Japanese Patent Laid-Open No. 2003-178743 Japanese Patent Laid-Open No. 05-020951 Japanese Patent No. 4565925 Japanese Patent No. 4620598

  In the first conventional lockable emergency stop pushbutton switch, the pushbutton is rotated so that the lock hole provided in the body of the pushbutton can be locked according to the lock hole of the bezel. At the time of operation, it is necessary to rotate the push button by releasing the hand or finger that is in contact with the head of the push button from the push button. For this reason, when the push button switch is operated with a non-slip glove or the like, the glove hinders the rotation of the push button, and there is a problem that it is not possible to smoothly enter the lockable state. In addition, since a rotational force is applied to the push button after being pushed in by a spring incorporated in the push button switch for rotating the push button, there is a problem in handling that the operational feeling is deteriorated.

The second conventional lockable emergency stop pushbutton switch is configured to open and close the pushbutton and the bezel locking hole by rotating a shutter provided in the gap between the pushbuttons in conjunction with the operation of the pushbutton. As a result, the configuration becomes complicated and the number of parts increases.
The present invention solves these problems, and can make a transition to a lockable state smoothly without applying a rotational force to the push button during operation of the push button, and can be manufactured at an inexpensive cost. It is a problem to provide.

In order to solve the above problems, the present invention has a cup-shaped push button at the head, an operating portion that receives a spring force in both the axial direction and the rotational direction, and a cylindrical shape that accommodates the operating portion. A bezel; and a switch portion operated by the operation portion. The operation portion is locked at a push-in position when pushed in an axial direction against the spring force, and the operation portion at the lock position is the spring. In the emergency stop pushbutton switch that is unlocked when twisted against the force and returns to the standby position by the spring force,
A cylindrical cylinder is provided inside the push button, and the cylinder and the push button are linked to each other so that they can freely rotate by a predetermined angle in the rotation direction and move together in the axial direction. A pair of locking holes through which the lock passes are formed at a predetermined position of the cylinder, and a locking hole is formed in the peripheral wall of the bezel surrounding the peripheral wall of the cylinder corresponding to the locking hole of the cylinder, and the push button and the cylinder are in the standby position. When the cylinder is placed, the lock hole of the cylinder and the lock hole of the bezel are placed at positions shifted from each other so that the lock cannot be inserted, and the push button is pushed into the push-in position by a push-in operation. When the cylinder is locked, the cylinder is rotated by a predetermined angle by the spring, and the locking hole of the cylinder and the locking hole of the bezel are placed in a position where they overlap each other. Characterized by a lockable to said operating portion in the locked position by inserting a padlock et locking hole (claim 1).

  2. The guide groove according to claim 1, wherein a pin projecting inward is fixedly provided on the peripheral wall of the bezel, and the guide groove guides the pin to the outer peripheral surface of the peripheral wall of the cylinder by a predetermined angle in the circumferential direction from the inlet of one end. By engaging the pin with the inlet of the guide groove at the standby position of the operation unit, the cylinder is locked in a state where it is twisted at a certain angle against the spring force from the lock position. When the cylinder is pushed in at the standby position in conjunction with the pushing operation of the push button, the pin is disengaged at the entrance of the guide groove and enters the groove, and the cylinder is moved by the spring force. It can be rotated by a predetermined angle (Claim 2).

  In the pushbutton switch according to the present invention, the locking hole of the bezel and the locking hole of the cylinder in the pushbutton are shifted from each other at the standby position, and can be locked by overlapping at the pushed-in lock position. At this time, if there is a partial overlap between the locking hole of the bezel and the locking hole of the push button at the standby position, this part becomes a gap and causes foreign matter to enter the operation unit. Therefore, it is desirable that the positions of both locking holes are completely displaced at the standby position, but it may be difficult to avoid partial overlap if the displacement is only in the axial direction (the push-button pushing direction). . In this case, according to the second aspect of the invention, if the operation portion is locked at a position rotated by a certain angle from the rotation position at the lock position and is made to stand by, the position of the lock hole in the standby state is changed from the lock hole of the bezel. Since it is shifted not only in the axial direction but also in the rotational direction, it is possible to reliably avoid the overlap of the locking holes at the standby position. When the lock pin is disengaged by the pushing operation, the operation unit at the standby position automatically rotates to the rotation position at the lock position by the spring force.

  In the first or second aspect of the invention, in order to prevent an axial space from being formed between the lower end of the push button and the upper end of the cylinder, the upper end of the cylinder is caused to enter the inside of the peripheral wall of the push button. (Claim 3).

  In the invention according to claim 1 or 2, a lock hole is formed in the top wall surface of the push button and the peripheral wall of the cylinder and the bezel so as to overlap each other at the lock position of the operation portion, and a lock is formed through these lock holes. Can be mounted (Claim 4).

  In the invention according to any one of claims 1 to 4, a scissor lock may be mounted across the locking hole provided in the push button and the locking hole provided in the bezel (invention 5).

  Although it is possible to install a plurality of locks simultaneously on the pushbutton switch of the present invention, when using a padlock or the like for the lock, the number of locks is 2 to 3 due to the installation space. It can be suppressed. Therefore, according to the invention of claim 5, if a scissor lock is mounted across the cylinder and the bezel, the number of locks to be installed can be arbitrarily increased. Here, the scissor lock is a hook-shaped locking tool comprising a pair of opening and closing arms, and has a hook fitted into a locking hole at one end of the opening and closing arm, and locks the operation of the opening and closing arm at the other end. It refers to one having a large number of locking holes.

According to the present invention, since the pushbutton switch can be directly locked, a separate part such as an erroneous operation prevention cover becomes unnecessary.
Further, in the present invention, a cylindrical cylinder is coupled to the inside of the push button of the operation portion of the push button switch so as to be rotatable by a predetermined angle in the circumferential direction, and this cylinder is interlocked with the push button pushing operation. The cylinder is rotated by a predetermined angle, and the locking hole provided in the peripheral wall of the cylinder and the peripheral wall of the bezel that accommodates the operation portion is overlapped with each other at the push-in lock position, and the lock is inserted across the overlapping locking holes. Lock. For this reason, no rotational force is applied to the push button when the push button switch is pushed in, and the conventional shutter is not required and the structure is simplified, so that the push button switch can be smoothly shifted to the locked state. An emergency stop pushbutton switch that can be manufactured at low cost can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the pushbutton switch for emergency stop of Example 1 of this invention, (a) is a standby state, (b) is a pushing state before a lock | rock, (c) shows a locked state (operation state). It is a longitudinal cross-sectional view of the standby state of the pushbutton switch for emergency stop of Example 1 of this invention. It is a longitudinal cross-sectional view of the locked state of the pushbutton switch for emergency stop of Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a standby state of an emergency stop pushbutton switch according to a first embodiment of the present invention, in which (a) is a transverse sectional view taken along line aa of an operating portion in (b), and (b) is an overall elevation. FIG. BRIEF DESCRIPTION OF THE DRAWINGS It shows the locked state of the pushbutton switch for emergency stop of Example 1 of this invention, (a) is a cross-sectional view in alignment with the aa line of the operation part in (b), (b) is the whole elevation. FIG. It is a disassembled perspective view of the operation part of the emergency stop pushbutton switch of Example 1 of this invention. It is a perspective view which cuts and shows a part of operation part of the pushbutton switch for emergency stop of Example 1 of this invention, (a) shows a standby state, (b) shows a locked state (operation state). For explaining the operation of the present invention, the relationship between the guide groove developed by the cylinder and the guide pin of the bezel is shown. (A) shows a standby state, (b) a pushed-in state, and (c) shows a locked state (operating state). FIG. It is a perspective view which shows a push-up mechanism of a cylinder by notching a part of the operation part of the emergency stop pushbutton switch according to the first embodiment of the present invention, wherein (a) is a standby state, and (b) is a locked state (operation state). ). It is a perspective view which shows the locking state of the pushbutton switch for emergency stops of Example 1 of this invention. It is a perspective view which shows the locking state of the pushbutton switch for emergency stops of Example 2 of this invention.

  Embodiments of the present invention will be described below with reference to the embodiments shown in the drawings.

  1 to 10 show a first embodiment 1 of the present invention.

As shown in FIG. 1, the push button switch S for emergency stop according to the first embodiment includes an operation unit 1 having a cup-like push button 11 with a cap 12 on the operation surface of the head, Thus, the switch unit 4 that is opened and closed is connected to be separable. The push button 11 of the operation unit 1 is supported by a bezel 13 having an upper end fitted in the peripheral wall 11b so as to be movable in both the axial direction and the rotational direction. An operation mechanism that opens and closes the switch unit 2 in conjunction with the operation of the push button 11 is accommodated in the bezel 13.
In the pushbutton switch S, the bezel 13, the spring, the contact portion, and the like are made of metal parts, and the others are made of a resin molded product.

Next, the operation mechanism accommodated in the bezel 13 will be described.
As is apparent from FIGS. 2, 3 and 6 in particular, the operation mechanism of the operation unit 1 includes a cylindrical cylinder 15 which is rotatably connected to each other via a push button 11 and a coiled torsion spring 14. Prepare. The push button 11 has a cup shape, and includes a top wall portion 11a and a peripheral wall portion 11b serving as an operation surface. A circular hole 11c is formed in the center of the top wall portion 11a. An engagement leg 12a provided at the center of the back surface of the cap 12 is fitted into the circular hole 11c, and the cap 12 is fixedly covered on the top wall portion 11c of the push button 11. The cap 12 is formed of a translucent member, and light from an illuminating light source (not shown) is guided to the cap 12 through the light guide rod 17 formed of the translucent member coupled to the engaging leg 12a to illuminate it. .

The cylinder 15 is inserted into the bezel 13 with the light guide rod 17 inserted through the packing 16 through the through hole in the center, and is supported by the bezel 13 so as to be movable in the axial direction and the rotational direction. . The outer peripheral wall of the cylinder 15 is provided with one or more (two pairs in this case) locking holes 15a through which the lock is passed, and one end is bent and released to the lower end, and the other end is closed. A pair of flange-shaped guide grooves 15b extending in the circumferential direction are provided to face each other (see FIGS. 4A, 6, 7, and 8).
In the peripheral wall of the bezel 13, one or more pairs (here, two pairs) of locking holes 13 a are provided so as to correspond to the locking holes 15 a of the cylinder 15. A pair of guide pins 13 b are provided on the peripheral wall of the bezel 13 so as to protrude further inward. The guide pin 13b engages with the guide groove 15b of the cylinder 15 (see FIGS. 2, 4A, and 7), and limits the movement range of the cylinder 15 in the axial direction and the rotational direction with respect to the bezel 13.

  A push rod 19 formed in a cylindrical shape inside the cylinder 15 is inserted through a return spring 18 formed of a torsion spring, and is coupled to the cylinder 15 so as to be rotatable in the axial direction with a slight play. Three circumferential step portions 19a, 19b, and 19c are provided on the outer periphery of the push rod 19 at intervals in the axial direction. The step portion 19 a is formed at the upper end of the push rod 19 and engages with a step portion 15 e provided on the inner periphery of the cylinder 15. The intermediate step portion 19 b supports one end of the return spring 18 that applies a restoring force in the rotational direction and the axial direction to the cylinder 15 and serves as a receiving portion for receiving the pressing force of the cylinder 15. The lower step portion 19c is partly cut away in the circumferential direction, and becomes a locking step portion for engaging the lock pin 21 to lock the push bar 19 at the axial standby position and the push-in position, respectively. . This locking step portion 19 c is formed in a pair at opposite positions on the outer periphery of the push rod 19.

  Further, a cylindrical frame 24 for connecting the switch unit 4 is inserted into the bezel 13. The lower end portion of the frame 24 extends to the outside of the lower end of the bezel 13 and forms a coupling portion 24 a with the switch portion 4. A fixing nut 28 is screwed into a lower end portion protruding from the bezel 13 of the frame 24 and tightened to the lower end of the bezel 14 to fix the frame 24 to the bezel 13. The upper end portion of the frame 24 is inserted into the cylinder 15 through the packing 23 so as to be relatively movable in the axial direction and the rotational direction.

  The frame 24 has a cylindrical shape, and the lock pin holder 20 is inserted and fixed therein. The lock pin holder 20 holds the lock pin 21 via the lock spring 22 so that the lock pin 21 can protrude and retract in the radial direction of the frame 24. The lock pin 21 held by the lock pin holder 20 is pushed inward by the lock spring 22 and is in contact with the lower step surface or the upper step surface of the lock step portion 19b of the push rod 19 inserted into the frame 24. Lock the position to the standby position and push-in position.

Further, the push bar 19 is inserted into the frame 24 so as to be movable only in the axial direction, and a cylindrical operation member 26 that contacts and operates the operation unit of the switch unit 4 is coupled to the distal end thereof. . The operation member 26 is pressed in the axial direction by a trigger spring 25 formed of a coiled compression spring interposed between the operation member 26 and the frame 24.
In addition, cam bodies 15e and 24a having inclined surfaces that rise to the upper left so as to be joined to each other are provided on the inner side of the outer peripheral wall of the cylinder 15 and the inner side of the peripheral wall of the frame 24 (see FIG. 9). These cam bodies act as a push-up mechanism that pushes up the cylinder 15 and the push rod 19 that are pushed into the push-in position in conjunction with the rotation of the push button 11 when the push-button switch S is returned. To do.
In order to prevent an axial gap between the push button 11 and the bezel 13, the upper end of the bezel 13 can move relative to the annular groove provided inside the push button 11 in the axial direction. Has been inserted.

When the operation unit 1 configured as described above is attached to the attachment panel 5 such as a control panel, the bezel 13 is attached to the attachment hole 51 of the panel 5 from the surface side of the panel 5 through the packing 13e as shown in FIG. The attachment portion 13 c formed at the lower end portion of the frame 24 is inserted together with the attachment portion 24 a at the lower end of the frame 24. The operation unit 1 is mounted by screwing a mounting nut 13d into a screw portion provided on the outer periphery of the mounting portion 13c of the bezel 13 inserted through the mounting panel 5 from the back side of the panel 5 and tightening the bezel 13 to the mounting panel 5. Fix to panel 5
As shown in FIG. 2, the emergency stop push button S is completed by detachably fitting the switch portion 4 to the connecting portion 24a of the frame 24 protruding from the lower end of the operation portion 1 fixed to the mounting panel 5. To do.
When the movable contact holder 41 of the switch unit 4 is operated in contact with the operation member 26 of the operation unit 1, a normally open switching contact mechanism 4a and a normally closed opening / closing mechanism as indicated by 4a and 4b in FIGS. Each contact mechanism 4b is opened and closed.
In a state where the push button 11 is in the standby position, the operation member 26 is separated from the movable contact holder 41, so that the movable contact holder 41 is pushed up by the return spring 42 of the switch unit. For this reason, as shown in FIG. 2, the normally open switching contact mechanism (a contact mechanism) 4a is opened (OFF), and the normally closed switching contact mechanism (b contact mechanism) 4b is closed (ON).
When the push button 11 is pushed down to the push-in position, the operation member 26 moves downward in conjunction with the push button 11 and comes into contact with the movable contact holder 41 of the switch unit 4 to push it down. Thereby, as shown in FIG. 3, the a contact mechanism 4a is closed (turned on), and the b contact mechanism 4b is opened (turned off).

Next, the operation of the push button switch configured as described above will be described.
FIG. 1 shows the appearance of the push button switch S in each operation state.
Before the operation, that is, in the standby state before the push button 11 is pushed in, as shown in FIG. 1A, the position of the lock hole 15a of the cylinder 15 is from the lock hole 13a of the peripheral wall of the bezel 13 of the push button switch S. It has been rotated to an off position. For this reason, the locking hole 13 a of the bezel 13 is closed by the peripheral wall (shaded portion) of the cylinder 15. Further, the switch section 4 is in a state where the internal switching contact mechanism is not operated, the a contact mechanism 4a is turned off, and the b contact mechanism 4b is turned on (see FIG. 2).
FIG. 1B shows a state in which the push button 11 is pushed down to the point where the operation unit 1 is locked, that is, a push-in state before the lock. In this state, the internal cylinder 15 is pushed in the axial direction in conjunction with the push-in operation of the push button 11, but since it has not yet been rotated, the locking hole 13a of the bezel 13 is similar to the case of FIG. The cylinder 15 is closed by a peripheral wall. As shown in FIG. 3, the open / close contact mechanism of the switch unit 4 is configured so that the push rod 19 and the operation member 26 are moved down to push down the movable contact holder 24a of the switch unit 4 in conjunction with the lowering of the cylinder 15. The a contact opening / closing mechanism 4a is turned on, and the b contact opening / closing mechanism 4b is turned off.
However, when the locking hole 13a of the bezel 13 is closed by the peripheral wall of the cylinder 15, the lock cannot be locked.

  Furthermore, the state which pushed the pushbutton 11 to the pushing position and locked the operation part 1 is shown in FIG.1 (c). When the push button 11 is pushed down to this position, details will be described later, but the internal cylinder 15 is rotated by a predetermined rotation angle. By the rotation of the cylinder 15, the locking hole 15a provided in the cylinder 15 moves to a position where it overlaps the locking hole 13a of the bezel 13, and the locking hole 13a of the bezel 13 is released from being blocked by the peripheral wall of the cylinder 15. Will come to be.

The internal operation mechanism of the operation unit 1 in the standby state of the push button switch S is in a state as shown in FIGS. 2, 4 (a), and 7 (a).
That is, in the standby state, the push button 11 is in the standby position as shown in FIG. In this state, the return spring 18 urges the cylinder 15 counterclockwise as indicated by an arrow in FIG. 7A and pushes it upward. For this reason, in this state, the cylinder 15 is pushed upward by the return spring 18, and the guide pin 13 b provided on the bezel 13 is provided on the cylinder 15 as shown in FIGS. 7A and 8A. Engage at the entrance of the vertical (axial) groove 15c of the bowl-shaped guide groove 15b. As a result, the counterclockwise biasing force applied from the return spring 18 is received at the inlet of the groove 15c of the cylinder 15, so that the cylinder 15 is locked at this position.
In this position, the locking hole 15 a of the cylinder 15 is shifted from the position of the locking hole 13 a of the bezel 13 in the axial direction and the rotational direction. The locking hole 13 a of the bezel 13 is completely covered by the peripheral wall of the cylinder 15. Blocked.

Here, when the push button 11 is pushed to the pushing position as shown in FIG. 1B, the cylinder 15 and the push rod 19 are pushed down against the upward spring force of the return spring 18 in conjunction with this. It is done. As a result, the guide pin 13b of the bezel 13 rises relatively in the inlet groove 15c of the cylinder 15 as shown in FIG. 8B, and reaches a position facing the horizontal groove of the guide groove 15b.
As a result, the locking of the cylinder 15 in the rotational direction is released, so that the cylinder 15 is separated from the push button 11 in the direction of arrow R shown in FIG. 8B by the counterclockwise biasing force applied from the return spring 18. Rotate independently. When the guide pin 13b moves relatively clockwise in the guide groove 15b and contacts the terminal end 15d of the guide groove 15b as shown in FIG. 8C, the cylinder 15 is locked and stopped (see FIG. 8). 7 (b)).
The rotation angle of the cylinder 15 is regulated by the length of the horizontal portion of the guide groove 15b. When the cylinder 15 comes to a position rotated by a predetermined angle, as shown in FIG. 3, the locking hole 15a provided in the peripheral wall of the cylinder 15 is opposed to the locking hole 13a in the peripheral wall of the bezel 13, and the locking hole 13a of this bezel is overlapped. Is released and released (see FIGS. 1 and 5B).

On the other hand, when the cylinder 15 is pushed down in conjunction with the pushing operation of the push button 11, the lower end of the cylinder 15 comes into contact with the step portion 19 b of the push bar 19 and pushes down the push bar 19. In this process, the push bar 19 is lowered to a position where the lock step portion 19c exceeds the lock pin while simultaneously pushing the lock pin 21 against the lock spring 22 against the lock spring 22 by the lock step portion 19c. As a result, the push bar 19 is locked at this position with the lock pin 21 engaged with the upper side of the lock step portion 19c, so that the push bar 19 is prevented from returning to the standby position.
When the push bar 19 is locked at the push-in position, the cylinder 15 and the push button 11 linked to the push bar 19 are also held at the push-in position.

  When the push rod 19 is pushed in this way, the operation cylinder 26 is pushed downward via the trigger spring 25, abuts against the movable contact holder 41 of the switch unit 4, and pushes it down against the return spring 42. When the movable contact holder 41 is pushed down, a movable contact and a fixed contact (not shown) at both ends of the movable contact 43 held thereby are closed or separated, the a contact opening / closing mechanism 4a is switched on, and the b contact opening / closing is performed. The mechanism 4b is switched off and held as it is (see FIG. 3).

When this pushbutton switch S is used for an emergency stop, the load control circuit driven via the b contact opening / closing mechanism 4b that is on in the standby state is pushed into the pushbutton switch S for an emergency stop. By operating, it is forcibly opened, and the operation of the load device to be controlled can be emergency stopped. If the pushbutton switch S is erroneously returned, the pushbutton switch S is returned to the standby state, and there is a risk that the emergency stop apparatus is restarted.
In order to eliminate such danger, the operation of the push button switch S in the push-in operation state as shown in FIG. 10 is performed so that the push button switch S placed in the push-in operation state is not erroneously returned. The pushbutton switch S is pushed in by inserting the lock 6 or the scissor lock 7 between the locking hole 13a of the pair of bezels 13 and the locking hole 15a of the cylinder 15 placed at the overlapping position of the part 1 and locking it. Can be locked in position.

  The scissor lock 7 can indirectly lock the pushbutton switch S by inserting the lock 6 into each of the plurality of locking holes 7a provided in the scissor lock 7 and locking the scissor lock. For this reason, when the number of the locking holes of the pushbutton switch S is insufficient, the number of the locking holes can be increased by using the scissor lock 7, and many locks can be locked.

  Since the push button 11 of the push button switch S thus locked through the lock 6 or the scissor lock 7 is disabled in any operation in the axial direction and the rotation direction, the push button switch S is locked in the operation state. In addition, an erroneous return operation can be completely prevented, which is safe.

When the state of the emergency stop load device is restored and the operation is resumed, it is necessary to release the operation state of the pushbutton switch S and return to the standby state.
Such a return operation of the pushbutton switch S is performed as follows.
As shown in FIG. 10, in order to return the pushbutton switch S in the push-in operation state locked by the lock 6 inserted directly through the lock hole or the lock 6 inserted through the scissor lock 7, first, all the locks 6 Is released, and the push button switch S is unlocked.

When the push button 11 of the push button switch S in the push-in operation state shown in FIG. 1C, FIG. 2 or FIG. 5B is released, the direction of the arrow displayed on the cap 12 (clockwise) In addition, the rotating operation is performed against the restoring spring force of the returning spring 18 in the counterclockwise direction. In conjunction with this, the cylinder 15 is rotated in the same direction. By this rotation, the guide groove 15b on the outer peripheral wall of the cylinder 15 moves in the direction of the arrow L with respect to the guide pin 13b provided on the bezel 13 engaged therewith, and the position shown in FIG. Return to the position shown in b).
By rotating the cylinder 15 in this way, the locking hole 15a on the peripheral wall of the cylinder 15 is disengaged from the position in the rotation direction of the locking hole 13a on the peripheral wall of the bezel 13, so that the locking hole 13a of the bezel 13 is again shown in FIG. As shown in a) and (b), the cylinder 15 is closed by the peripheral wall.

At the same time, the cylinder 15 rotates with the rotation of the push button 11, and the cam body 15e provided on the cylinder 15 rotates clockwise as shown by the arrow in FIG. It joins with the cam body 24a.
From this point, when the push button 11 is further rotated in the clockwise direction, an axial push-up force is generated in the cam body 15e of the cylinder 15 by the cam body 24a of the fixed frame 24. The cylinder 15 is pushed upward by this pushing force while compressing the cylinder 15 against the restoring force in the axial direction of the return spring 18. Thereby, the locking 15a of the cylinder 15 is removed from the axial direction and the position of the locking hole 13a of the bezel 13. Then, the guide pin 13b engaged with the guide groove 15b on the outer peripheral wall relatively descends the vertical portion 13c of the guide groove 13b and reaches the inlet end of the guide groove 13c as shown in FIG. The counterclockwise rotation of the cylinder 15 is locked, and the cylinder 15 returns to the standby state.

  On the other hand, the push bar 19 in which the lock step portion 19b is engaged with the lock pin 21 and locked in the pushing position is provided by the step portion 15f at the lower end of the inner periphery of the cylinder 15 with the step portion 19a at the upper end of the push rod 19 engaged therewith. Since it is pushed up in conjunction with the ascending movement of the cylinder, the lock pin 21 is raised while being pushed toward the outer diameter side by the lock step portion 19b. Then, the push bar 19 stops at the position where the lock pin 21 exceeds the lock step portion 19b and returns to the standby position.

The push button 11 that has been rotated is released to the original position by the restoring spring force in the rotational direction of the push button return spring 14 by releasing this rotational operation force, and returns to the standby position.
In this way, the push button switch S returns to the standby position as shown in FIG. 1A, FIG. 2, FIG. 4, etc., and prepares for the next pushing operation.

FIG. 11 shows a second embodiment of the present invention.
The push button switch S of the second embodiment has the same basic configuration as the push button switch S of the first embodiment described above, but has a locking hole on the top wall surface 11a of the push button 11 of the operation unit 1. 11h is provided, and correspondingly, locking holes (not explicitly shown in FIG. 11) are provided in the peripheral wall of the internal cylinder and the peripheral wall of the bezel 3 to increase the number of locking points.
Thereby, not only the locking hole of the peripheral wall of the bezel but also the lock 6 or the scissor lock 7 can be inserted through the locking hole 11h of the top wall of the push button 11 to lock the push button switch S, and the operation can be prohibited. .

S: Push button switch 1: Operation part 11: Push button 11h: Locking hole 13: Bezel 13a: Locking hole 15: Cylinder 15a: Locking hole 18: Return spring 19: Push rod 21: Lock pin 24: Frame 4: Switch part 4a : Normally open contact (a contact) switching mechanism 4b: Normally open contact (b contact) switching mechanism 5: Mounting panel 6: Lock 7: Scissor lock

Claims (5)

An operation unit having a cup-shaped push button on the head and receiving spring force in both the axial direction and the rotation direction, a cylindrical bezel that accommodates the operation unit, and a switch unit operated by the operation unit The operation portion is locked at a push-in position when the operation portion is pushed in the axial direction against the spring force, and the operation portion at the lock position is locked when being twisted against the spring force. In the emergency stop pushbutton switch that is released and returns to the standby position by the spring force,
A cylindrical cylinder is provided inside the push button, and the cylinder and the push button are linked to each other so that they can freely rotate by a predetermined angle in the rotation direction and move together in the axial direction. A pair of locking holes through which the lock passes are formed at a predetermined position of the cylinder, and a locking hole is formed in the peripheral wall of the bezel surrounding the peripheral wall of the cylinder corresponding to the locking hole of the cylinder, and the push button and the cylinder are in the standby position. The locking hole of the cylinder and the locking hole of the bezel are placed at positions shifted from each other so that the lock cannot be inserted, and the push button is moved to the pushed position by pushing operation. When pushed and locked, the cylinder is rotated by a predetermined angle by the spring, and the locking hole of the cylinder and the locking hole of the bezel are placed in a position where they overlap each other. Emergency stop switch, characterized by a lockable to said operating portion in the locked position by inserting the lock into locking holes of.   A pin that protrudes inwardly is provided on the peripheral wall of the bezel, and a circumferential guide groove is provided on the outer peripheral surface of the peripheral wall of the cylinder to guide the pin from the inlet at one end by a predetermined angle. By engaging the pin with the inlet of the guide groove at the standby position, the cylinder is locked in a state where it is twisted at a certain angle from the lock position against the spring force. When the cylinder is pushed in in conjunction with the pushing operation, the pin is disengaged at the entrance of the guide groove and enters the groove, and the cylinder can be rotated by the predetermined angle by the spring force. The emergency stop pushbutton switch according to claim 1.   3. The emergency stop according to claim 1, wherein the push button covers the upper end portion of the cylinder from the outside so that an axial space does not occur between the lower end of the push button and the upper end of the cylinder. Pushbutton switch.   A lock hole is formed in the top wall of the push button and the peripheral wall of the cylinder and the bezel so as to overlap each other at the lock position of the operation unit, and a lock can be attached through the lock holes. The pushbutton switch for emergency stop according to claim 1 or 2.   The emergency stop push button according to any one of claims 1 to 4, wherein a scissor lock is mounted across a lock hole provided in the push button and a lock hole provided in the bezel. switch.

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