JP6848707B2 - Pushbutton switch for emergency stop - Google Patents

Description

The present invention relates to a pushlock / turn reset type emergency stop pushbutton switch used to stop a load in an emergency.

The emergency stop push button switch (hereinafter, simply referred to as a push button switch) forcibly disconnects the power supply circuit of the load (mechanical equipment) by pushing the push button during an emergency or maintenance inspection of the mechanical equipment.
Even if the push button is released after the push button is pushed, the push button switch holds the contact mechanism at the open path position and is locked in the pushed state (locked state). Then, as a method of returning (resetting) the locked state of the push button to the standby position (normal position), there is a method of twisting the push button (push lock / turn reset method).

However, this push-lock / turn-reset device is extremely dangerous because if it is accidentally reset while the load is stopped, an accident that may endanger human life may occur.
Therefore, a lockout type pushbutton switch that locks the pushbutton so that the reset operation cannot be easily performed has been proposed.
As a lockout type push button switch, there is one in which an accessory such as a cover is arranged on the push button (for example, Patent Document 1). In addition, there is also one that can be locked by sliding the guard after pushing the push button (for example, Patent Document 2).
Further, there is also a push button switch that forms a large operation unit and is provided with a part dedicated to locking (for example, Patent Documents 3, 4, and 5).

European Patent Application Publication No. 1542251 European Patent Application Publication No. 17236660 Japanese Unexamined Patent Publication No. 2006-49176 Japanese Unexamined Patent Publication No. 2007-66681 Japanese Patent No. 5476113

By the way, since it is necessary to remove the accessory of the push button switch of Patent Document 1 at the time of locking, it takes time and effort to lock the switch.
Since the push button switch of Patent Document 2 can be locked by sliding the guard, an operation other than the locking operation is required.
Further, when the push button switches of Patent Documents 3 and 4 are used for the existing push button switch, it is necessary to replace all the button sides, and the product cost increases because the switch is a dedicated switch having a locking function. .. Further, when the push button switch of Patent Document 5 is used for an existing push button switch, it is necessary to attach a part dedicated to locking, which may increase the product cost.

Therefore, an object of the present invention is to provide an emergency stop pushbutton switch that can be easily locked without requiring an operation other than the locking operation and can also reduce the product cost.

In order to achieve the above object, the emergency stop pushbutton switch according to one aspect of the present invention includes a button portion and an operation portion. The button portion forms a locking hole that communicates from the push surface to the back surface. In the operation unit, the operation shaft is detachably connected to the back surface of the button unit. Then, the button portion is locked to the pushed position by the pushing operation of the button portion, and the button portion is returned to the normal position by the twisting operation of the button portion. Further, the operation unit is detachably attached with a lockout member extending close to the back surface of the button unit. Then, when the lock is hooked on the lock hole with the button portion locked at the pushing position, the lock engagement portion of the lockout member engages with the lock to prevent the button portion from being twisted. ..

According to the push button switch for emergency stop according to the present invention, locking can be easily performed without the need for operations other than locking work, and product cost can be reduced.

It is a perspective view which shows the push button switch for emergency stop of 1st Embodiment which concerns on this invention. It is a developed perspective view which shows the push button switch for emergency stop of 1st Embodiment. It is a half sectional view which shows the normal state of the push button switch for emergency stop of 1st Embodiment. It is a figure which showed the normal state of the push button switch for emergency stop of 1st Embodiment from the push surface of a button part. It is a half cross-sectional view which shows the state which pushed the button part of the emergency stop push button switch of 1st Embodiment with a full stroke. It is a half sectional view which shows the locked state of the push button switch for emergency stop of 1st Embodiment. It is a perspective view which shows the lockout operation of the push button switch for emergency stop of 1st Embodiment. It is a figure which shows the structure of the 1st lock which is in the lockout state of the push button switch for emergency stop of 1st Embodiment. It is a figure which shows the structure of two locks which are in the lockout state of the push button switch for emergency stop of 1st Embodiment.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other.

In addition, the first embodiment shown below exemplifies an apparatus or method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, and structure of the component parts. , Arrangement, etc. are not specified as the following. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.
Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings. The terms such as "top", "bottom", "bottom", "front", and "rear" described in the following description are used with reference to the directions in the attached drawings.

[Emergency stop push button switch (push button switch)]
Hereinafter, the structure of the emergency stop pushbutton switch 1 (hereinafter referred to as the pushbutton switch 1) of the first embodiment will be described with reference to FIGS. 1 to 9. The push button switch 1 of the first embodiment is attached to the mounting panel 36 shown in FIG. 2, but the mounting panel 36 is omitted in FIGS. 1 and 3, and 5 to 9.
As shown in FIG. 1, the push button switch 1 of the first embodiment is a push lock / turn reset type device, and includes a button unit 2, an operation unit 3, a mounting glove 4, and a lock receiving member 5. , Is equipped.

[Button part]
As shown in FIG. 3, the button portion 2 is a member made of GFRP (glass fiber reinforced plastic) or the like, and includes a button main body 8, a slide cylinder portion 9, and a rod connecting cylinder portion 10. ..
The button body 8 is a disk-shaped portion, reference numeral 8a is a pressing surface, and the back side of the pressing surface 8a is referred to as a back surface 8b. A cylindrical slide cylinder portion 9 projects from one end of the button body 8 in the axial direction.
The rod connecting cylinder portion 10 is a cylindrical portion formed inside the slide cylinder portion 9 so as to communicate with the glove mounting hole 11 formed in the central portion of the button body 8.
As shown in FIG. 1, on the outer peripheral side of the button body 8, two locking holes 12 and 12 for passing a lock, which will be described later, are formed at axially symmetrical positions of the button portion 2.

[Operation unit]
The operation unit 3 opens and closes a contact portion (not shown) in response to a pushing operation and a twisting operation of the button portion 2, and the contact portion is connected to the rear portion of the operation unit 3.
As shown in FIG. 3, the operation unit 3 includes an operation unit case 14, a large-diameter frame 15, a small-diameter frame 16, an operation rod 17, a rod-side engagement protrusion 18, and a case-side engagement protrusion 19. A return spring 20 and a slide rod 21 are provided.
The operation unit case 14 has a box shape having a built-in opening / closing operation unit (not shown) that opens / closes the contact portion.

The large-diameter frame 15 is a cylindrical portion that integrally protrudes from the operation portion case 14, and has a front end side frame 15a having male threads formed on the outer circumference and a base end side frame 15b having no male threads formed on the outer circumference. And have.
The small-diameter frame 16 is a portion that protrudes integrally from the operation unit case 14 and is formed coaxially inside the large-diameter frame 15.
The operation rod 17 is a cylindrical member, and a cylindrical slide rod 21 is connected to the outer circumference on the tip end side (upper part of FIG. 3).

As shown in FIG. 3, a slit 17a extending in the axial direction is formed on the tip end side of the operation rod 17, and a protrusion 21a of the slide rod 21 is inserted into the slit 17a, and the shaft of the slit 17a is inserted. The protrusion 21a moves by the length in the direction. As a result, the slide rod 21 is slidable by a predetermined distance in the axial direction of the operation rod 17, and is connected to the operation rod 17 so that it cannot rotate relative to the operation rod 17.
The outer circumference of the slide rod 21 is slidably supported on the inner peripheral surface of the small diameter frame 16, and a male screw 23 is formed on the outer circumference on the tip end side thereof.

The rod-side engaging projection 18 is a portion that bulges outward in the radial direction on the base end side of the operating rod 17 arranged inside the operating portion case 14.
The case-side engaging protrusion 19 is arranged inside the operating portion case 14 and engages with the rod-side engaging protrusion 18.
Inside the operation unit case 14, the case-side engaging protrusion 19 is arranged in contact with the rod-side engaging protrusion 18.

[Return spring]
The return spring 20 is a cylindrical coil spring that also serves as a compression spring and a torsion spring, both ends of which are coupled to a slide rod 21 and an operation portion case 14, respectively, and a shaft with respect to the slide rod 21 of the operation rod 17. A spring force is applied in both the directional direction and the rotational direction.

[Lock receiving member]
The lock receiving member 5 is a member formed by pressing a metal plate, and as shown in FIG. 2, a ring-shaped fixing portion 30, a pair of arm portions 31, 31 and a pair of arm portions 31, It includes a bent portion 32a formed by bending at a right angle at the tip of 31, and a lock engaging portion 32b formed by bending the end portion of the bent portion 32a.
A plurality of convex portions 33 are formed on the inner peripheral surface of the fixed portion 30 at predetermined intervals in the circumferential direction. The pair of arm portions 31, 31 extend in the same axial direction from the axially symmetric position of the fixed portion 30. The lock engaging portions 32, 32 are formed by bending the tip portions of the pair of arm portions 31, 31.

As shown in FIGS. 2 and 3, the waterproof packing 34 attached to the outside of the large-diameter frame 15 of the operation unit 3 is arranged in contact with the operation unit case 14.
Here, on the outer periphery of the large-diameter frame 15 of the operating portion 3, a plurality of grooves 35 extending in the axial direction into which the plurality of convex portions 33 formed in the fixing portion 30 of the lock receiving member 5 are fitted are formed. There is.
A panel hole 37 is formed in the mounting panel 36 shown in FIG. 2, and the waterproof packing 34 is brought into close contact with the mounting panel 36 by inserting the large diameter frame 15 of the operation unit 3 into the panel hole 37.

Then, the convex portion 33 of the lock receiving member 5 is fitted into the groove 35 of the large diameter frame 15 to bring the fixing portion 30 of the lock receiving member 5 into contact with the mounting panel 36, and then the female screw of the tightening nut 6 is attached to the large diameter frame. It is screwed into the male screw formed on the outer circumference of the tip side frame 15a of 15. As a result, the lock receiving member 5 is fixed to the operating portion 3 in a state where the fixing portion 30 is sandwiched between the mounting panel 36 and the tightening nut 6.

[Mounting gloves]
On the other hand, as shown in FIG. 3, the mounting glove 4 is a cap-shaped member having a female screw 24 formed on the inner peripheral surface, and is mounted in the glove mounting hole 11 of the button portion 2 and has a male screw 23 of the slide rod 21. The female screw 24 is screwed into the screw. As a result, the button portion 2 is attached to the slide rod 21 by sandwiching the rod connecting cylinder portion 10 of the button portion 2 between the attachment glove 4 and the slide rod 21 from the axial direction.
At this time, the slide cylinder portion 9 of the button portion 2 is inserted between the large-diameter frame 15 and the small-diameter frame 16 of the operation portion 3 and is slidably arranged. Further, as shown in FIG. 2, a plurality of grooves 25 extending in the axial direction are formed on the inner peripheral surface of the glove mounting hole 11 of the button portion 2, and a plurality of protrusions 26 are formed on the outer periphery of the tip side of the operation rod 17. It is formed, and by fitting a plurality of corresponding protrusions 26 into the plurality of grooves 25, the relative rotation of the button portion 2 and the operation rod 17 is regulated.

Here, the button portion according to the present invention corresponds to the button portion 2, and the operation shaft according to the present invention corresponds to the operation rod 17 and the slide rod 21. Further, the lockout member according to the present invention corresponds to the lock receiving member 5. Further, the lock according to the present invention corresponds to the padlock 41 and the scissors lock 44 (see FIG. 7). Further, the case according to the present invention corresponds to the operation unit case 14. Further, the wording that the lock engaging portion of the lockout member can be seen from the lock hole of the button portion when the button portion according to the present invention is viewed from the push surface side means that the push button switch 1 in the normal state is the button portion. When shown from the second side, it corresponds to the fact that only the lock engaging portion 32b is arranged so as to be visible from the two locking holes 12 formed in the button body 8. Further, the positioning portion according to the present invention corresponds to the convex portion formed on the fixing portion 30 of the lock receiving member 5 and the groove 35 formed on the outer periphery of the large-diameter frame 15 of the operating portion 3.

[Operation of push button switch for emergency stop]
Next, the normal state, the locked state, the reset operation, and the lockout operation of the push button switch 1 of the first embodiment will be described with reference to FIGS. 3 to 9.
The normal state of the push button switch 1 is a state in which the button unit 2 protrudes in front of the operation unit 3. Further, the locked state of the push button switch 1 is a state in which the contact of the contact portion is switched from ON to OFF and the contact mechanism is self-held in the open path position and held in the pushed position even if the hand is released from the button portion 2. is there. Further, the reset operation of the push button switch 1 is an operation of rotating the button unit 2 in the clockwise direction. Furthermore, the lockout operation of the push button switch 1 is an operation of holding the locked state.

In the normal state of the push button switch 1, as shown in FIG. 3, a pair of arm portions 31 and 31 of the lock receiving member 5 fixed to the operation portion 3 and a fold formed at the tip of the pair of arm portions 31 and 31. The curved portion 32a and the lock engaging portion 32b are arranged apart from the button portion 2.
Further, as shown in FIG. 4, when the push button switch 1 in the normal state is shown from the button portion 2 side, it is arranged so that only the lock engaging portion 32b can be visually recognized from the two locking holes 12 formed in the button body 8. Has been done.

Next, FIG. 5 shows a pushing operation of the push button switch 1.
When the push surface 8a of the button portion 2 is pushed to the full stroke, the lock engagement portion 32b of the lock receiving member 5 enters the inside of the two locking holes 12 formed in the button body 8.
Then, by pushing the button portion 2, the slide rod 21 moves to the operation unit case 14 side, and the operation rod 17 also moves to the operation unit case 14 side (lower side in FIG. 5) in accordance with the slide rod 21. To go.
When the operating rod 17 moves to the operating portion case 14, the contacts of the contact portion connected to the operating portion 3 are switched from ON to OFF, and at the same time, the rod-side engaging projection 18 gets over the case-side engaging projection 19. Then, the operation rod 17 is held at the pushing position.

Next, FIG. 6 shows the locked state of the push button switch 1.
In the pushing operation of the push button switch 1 of FIG. 5, the return spring 20 becomes a compression spring due to the movement of the slide rod 21 toward the operating portion case 14. Therefore, in this locked state, the slide rod 21 moves to the normal position (position before pressing the button portion 2) by the spring force of the return spring 20 until the protrusion 21a abuts on one end of the slit 17a. ..
Then, since the button portion 2 attached to the slide rod 21 also moves to the normal position side, in the locked state, the lock engaging portion 32b that has entered the inside of the lock hole 12 of the button portion 2 is the lock hole 12. It will be a position away from.

Further, in the reset operation of the push button switch 1, the button portion 2 is twisted in the clockwise direction (reset direction) indicated by the arrow in FIG. 1 to about 45 ° (see FIG. 9). By this operation, the rod-side engaging projection 18 of the operating rod 17 can move in the axial direction by passing through a notch (not shown) provided in a part of the case-side engaging projection 19 in the circumferential direction. Then, the operation rod 17 and the slide rod 21 move in a direction away from the operation unit case 14 by receiving the spring force of the return spring 20, and the button unit 2 also returns to the normal state position in accordance with the slide rod 21. .. Then, the operation rod 17 moves in the direction away from the operation unit case 14, so that the contacts of the contact portion are switched from OFF to ON.

Next, FIGS. 7 to 9 show a lockout operation of the push button switch 1.
As shown in FIG. 7, a scissors in which a padlock 41 through which a shackle 40 has passed is hung on one of two locking holes 12 of the locked button portion 2, and claws 42 and 43 are passed through the other locking hole 12. Hang the lock 44.
As shown in FIGS. 8 and 9, one lock engaging portion 32b of the lock receiving member is close to the shackle 40 of the padlock 41 that has passed through one of the lock holes 12.
Further, as shown in FIG. 9, the claws 42 and 43 of the scissors lock 44 that have passed through the other lock hole 12 are also close to the lock engaging portion 32b of one of the lock receiving members.

Therefore, even if the button portion 2 is to be twisted clockwise to about 45 °, the shackle 40 of the padlock 41 and the claws 42 and 43 of the scissors lock 44 are engaged with the lock engaging portion 32b of the lock receiving member to engage the button. The lockout of the pushbutton switch 1 is held because it interferes with the twisting operation of the portion 2. The padlock 41 and the scissors lock 44 may be hung on one and the other locking holes 12 in reverse.

[Effect of push button switch]
According to the push button switch 1 of the first embodiment, when the lockout method is adopted for the existing push button switch, the slide rod 21 replaces the existing button portion with the button portion 2 in which the lock hole 12 is formed. It is not necessary to dispose of the existing push button switch because the lock receiving member 5 may be attached to the operation unit case 14 at the same time.
Further, since the lock receiving member 5 may be attached to the operation portion case 14 on the back side of the button portion 2, the accessibility to the button portion 2 and the operability when pressing the button portion 2 with a fist or the palm in an emergency are impaired. Never.
Further, when performing the lockout operation, an action such as covering the cover is not required.
Therefore, the push button switch 1 of the first embodiment can be easily locked without requiring an operation other than the locking operation, and the product cost can be reduced.

1 Push button switch 2 Button part 3 Operation part 4 Mounting glove 5 Lock front receiving member 6 Tightening nut 8 Button body 8a Push surface 8b Back side 9 Slide cylinder part 10 Rod connecting cylinder part 11 Glove mounting hole 12 Locking hole 14 Operation part case 15 Large-diameter frame 15a Tip-side frame 15b Base-end-side frame 16 Small-diameter frame 17 Operation rod 17a Slit 18 Rod-side engaging protrusion 19 Case-side engaging protrusion 20 Return spring 21 Slide rod 21a Protrusion 23 Male screw 24 Female screw 25 Groove 26 Protrusion 30 Fixed part 31 Arm part 32a Bent part 32b Lock engaging part 33 Convex part 35 Groove 40 Shackle 41 Padlock 42, 43 Claw 44 Scissors lock

Claims (5)

A button part that forms a locking hole that communicates from the push surface to the back surface,
The operation shaft is detachably connected to the back surface of the button portion, the button portion is locked to the pushing position by pushing the button portion, and the button portion is returned to the normal position by twisting the button portion. Equipped with an operation unit
When a lockout member extending close to the back surface of the button portion is detachably attached to the operation portion and the lock is hooked on the lock hole in a state where the button portion is locked at the pushing position. An emergency stop push button switch in which the lock engaging portion of the lockout member engages with the lock. The lockout member is
An annular fixing portion that is detachably attached to the outer periphery of the case of the operating portion, and
An arm portion extending from the fixed portion toward the back surface side of the button portion, and
The push button switch for emergency stop according to claim 1, further comprising the lock engaging portion provided at the tip of the arm portion. The push button switch for emergency stop according to claim 2, wherein a positioning portion is formed on the case and the fixed portion. The emergency stop pushbutton switch according to any one of claims 1 to 3, wherein the lock engaging portion is located inside the locking hole when the button portion is pushed to the full stroke. The push button switch for emergency stop according to any one of claims 1 to 4, wherein at least two locking holes are formed in the button portion.

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