JPH0636650A - Safety switch device - Google Patents

Abstract

PURPOSE:To provide a safety switch device which is sufficiently reliable and safe by enabling a door or the like to be opened and closed only by means of a switch main body of an especial structure and a switching actuator. CONSTITUTION:A switching actuator 2 is inserted from the inlet 5a of a switch main body 1 and has its enlarged piece 2b energized by an end acute-angle portion so that a pair of operating discs 8, 9 being joined together are slid against a support shaft 7 and pressed in the direction in which they are separated from each other. Therefore, an operating hook portion 2e, 2f provided at the end of the pair of operating pieces 2c of the actuator 2 is engaged in a recessed portion 11 formed in the outer surface of each operating disk 8, 9 and also the engaging pin 14c of a driven body 14 integrated to the switching shaft 13 of a switch portion 3 is engaged in a cam-shaped groove lid formed in the outer surface of each operating disc 8, 9. Further insertion of the actuator 2 causes the operating hook portions 2e, 2f to rotate the operating discs 8, 9 while pressing the recessed portion 11, so as to shift rearward the engagign pin 14c which slides following the cam-shaped groove 11d, so as to switch the switch portion 3 by means of movement of the switching shaft 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is, for example, turned off when a door of a doorway of a room or a factory in which an industrial machine is installed or a protective door provided in a danger zone of the industrial machine itself is opened and the internal door is opened. By automatically stopping the operation of the machine and preventing the machine from operating unless the doors and protective doors are completely closed, it is possible to ensure that the human body is caught in an industrial machine before the trouble occurs. The present invention relates to a safety switch device for prevention.

[0002]

2. Description of the Related Art Conventionally, for example, in Europe, maintenance work for industrial machines has been used as a means for preventing accidents caused by a third person accidentally turning on power during maintenance work on industrial machines. Prior to the procedure, a worker must remove all fuses from the fuse-type blade switch and put them in their pockets before starting work.In the United States, maintenance workers should not turn on the power after shutting it off. It is locked with a key, and the management method for ensuring the safety of such maintenance work is legally required. However, with such a management method that relies on the awareness of the worker himself, there is a risk that the worker will forget it and lose its effect.

Therefore, when a dangerous industrial machine which is liable to be caught or damaged by a human body is installed, a door or an industrial door of a room or factory where the machine is installed or an industrial machine is installed. By installing a safety switch device that automatically detects the opening and closing of its own protective door and turns it on and off, it is prohibited to enter a hazardous area, and as long as a human body exists in a room or factory, it is installed internally. It is preferable to prohibit the operation of the industrial machine or prevent the machine from operating unless the protective door is closed. As a conventional safety switch device used for such an application, a limit switch is provided in a sliding portion of a door, and the operation of the internal industrial machine is detected by detecting the open state of the door by the operation of the limit switch. There is a configuration that makes it stop.

[0004]

However, in the limit switch and the like, the internal switch contact can be switched by manipulating the contact piece artificially regardless of opening and closing of the door or the protective door. For example, there is a risk that the limit switch will not be operated for some reason, such as being troublesome, or the switching operation will be artificially performed, and it cannot be said to be a reliable safety switch device. Moreover, generally, the limit switch is turned off by the return spring when the door or the protection door is opened, but when the switch contact is welded, there is a malfunction that the contact does not open only with the restoring force of the return spring. It is easy to occur, and there is a risk of serious trouble in which the industrial machine installed inside will not stop even if the door or protective door is opened.

Therefore, according to the present invention, the switching operation is never performed by any artificial operation other than the intended operation such as opening and closing of the door, and the contact is surely turned on / off even if welding or the like occurs. It is a technical object to provide a safety switch device that can be operated.

[0006]

As a technical means for achieving the above object, the present invention has a safety switch device configured as follows. That is, in a safety switch device that is turned on / off by opening and closing a door, etc., a switching actuator attached to a movable member such as a door and a built-in switch actuator are inserted and removed from an elongated insertion hole. The switching actuator is composed of a switch main body that is operated by a passive operation section to switch the switch section.The switching actuator includes a strip-shaped expanding piece with an acute-angled tip and a space on both sides of the expanding piece. And a pair of actuating pieces each having an operating hook portion formed at the tips thereof in parallel with each other are arranged in a flat plate to be integrally formed, and the passive operating portion of the switch body is rotated about a spindle. A pair of symmetric working discs, which are freely and slidably inserted, are urged so as to overlap each other, and the expanding piece pushes the working discs in a separating direction from each other between the working discs. Movement While being inserted, the recesses that engage with the respective operating hooks on the outer surface of each of the operating discs during the moving process in the separating direction due to the insertion of the expanding piece, and the switch portion. And a cam-shaped groove into which a pair of engaging pins of a passive body fixedly attached to the tip of the switch switching shaft are respectively inserted, and the inserting operation of the switching actuator after the recess is engaged with the operating hook. Each of the operating disks is rotated by the above, and the engagement pin is slidably contacted with the cam-shaped groove to operate the switch switching shaft to switch the switch portion.

Further, a passive receiving surface that is pressed by the operating hook to rotate the operating disc in the forward direction when the switching actuator moves in the insertion direction, and the switching actuator are pulled out of the recess. It is also possible to form both the concave wall and the return receiving surface that is pressed by the operating hook so as to rotate the operating disc in the opposite direction when moving in the releasing direction.

Further, a locking projection is formed at a joint portion of the operating disks on the substrate of the switch body, and the locking projection is engaged with the inner joint surface of each of the operating disks. It is preferable that each of the detent notches be formed so that the detent notch is detached from the locking projection by the movement of each of the operating disks in the separating direction by inserting the expanding piece.

[0009]

For example, if the switching actuator is provided in a protruding state on the door and the switching body is arranged at a position where the switching actuator is inserted from the insertion hole when the door is closed, the switching actuator in a flat plate shape when the door is closed. Is inserted into the switch body through the slotted insertion hole, and first, the sharp-angled tip of the expansion piece of the switching actuator is press-fitted between the two working discs in the joined state. Since the plates are pushed in the separating direction against each other against the biasing force in the joining direction, the respective operating disks move in the separating directions while sliding on the support shafts. In the process of moving,
The operating hooks at the tips of the pair of operating pieces on both sides of the switching actuator engage with the recesses on the outer surface of each operating disk, and the engaging pins engage with the cam-shaped grooves. After that, when the switching actuator is further inserted, the concave portion is pressed by the engaging hook portion to rotate the operating disc, and along with this rotation, the engaging pin slides while following the cam-shaped groove of the operating disc. The switch unit is contacted and moved backward, and the switch switching shaft having the passive body having the engaging pin fixed to the tip thereof is moved to switch the switch unit.

In this safety switch device, a switching actuator is inserted from an elongated insertion hole, and a pair of operating discs are joined together by a biasing force by an expanding piece whose tip has an acute angle. Are separated from each other so that the engagement pins are engaged with the respective cam-shaped grooves on the respective outer surfaces, and while maintaining this state, the respective operating disks are rotated through the recesses on the outer surface of the switch portions, Since it is switched, it is impossible to artificially operate, for example, inserting a plurality of kinds of members from the insertion holes of the long hole shape to perform the above-mentioned operation, and a dedicated switching member fixed to the door is used. The switch cannot be operated externally unless an actuator is used.
The switch device is extremely reliable and safe.

If the operation receiving surface and the return receiving surface are provided on the concave walls on both sides of the concave portion of the operating disk, the tip of the operating piece of the switching actuator inserted from the insertion hole of the switch body is provided. The operating hook part presses the operation receiving surface of the operating disc to rotate the operating disc in the forward direction, and the operating disc is rotated in the forward direction until the switching operation of the switch part is completed. The return receiving surface is located on the extraction direction side of the switching actuator with respect to the operating hook. Therefore, when the door is opened next time and the switching actuator is pulled out of the switch body, the operating hook pushes the return receiving surface to rotate the operating disk in the opposite direction, so that the switching contact of the switching unit. Even if it is welded, it can be forcibly opened surely and the malfunction of the switch part can be completely prevented.

Further, a locking projection is formed at a joint portion of both operating discs on the substrate of the switch body, and a detent lock for engaging the locking protrusion on each joint inner surface of each operating disc. If the notches are formed respectively and the rotation preventing notches are separated from the locking projections by the movement of the respective operating discs in the separating direction by the insertion of the expanding pieces, both operating discs will be separated from each other. Since it is prevented from rotating unless it is separated, it is possible to further completely prevent artificial switching operation, and it is possible to prevent each operating disk from rotating in a predetermined state during normal operation and hold it, so that malfunctions can be more reliably prevented. It will be safe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 8 show an embodiment of the present invention, and as shown in FIG. 1 which is an exploded perspective view,
The switch main body (1) has a box shape and a switching actuator (2) having a key shape as a whole. The switch main body (1) has a switch part (3) and a switching part. And a passive operation section (4) which is operated by the actuator (2) to switch the switch section (3). The base of the switching actuator (2) is fixed to a movable member, for example, a door in a protruding state in the opening / closing direction of the door by a screw. On the other hand, in the switch body (1), when the door is closed, the switching actuator (2) is inserted from any of the insertion holes (5a) and (5b) of the lid body (5) of the passive operation section (4). Is fixed in place. In this embodiment, the switching actuator (2) can be inserted in any of two directions as shown by the solid line and the one-dot chain line in FIG. Against Figure 1
The insertion holes (5a) and (5b) are drilled in the two orthogonal surfaces of the lid (5) of the passive operation part (4) so that either the illustrated state or the orthogonal state can be selected and attached. The case where it is installed is shown.

The switching actuator (2) includes a mounting plate portion (2a) for mounting to a door or the like with a screw, and a strip-shaped expanding piece having a sharp tip end protruding in a direction orthogonal to the mounting plate portion (2a). (2b) and a pair of actuating hooks (2e), (2f), which are located in parallel on both sides of this expanding piece (2b) with a space therebetween and whose tips are bent inward. The operating pieces (2c) and (2d) are integrally formed in a planar shape.

Next, the switch body (1) will be described with reference to FIG. 2 showing a cut right side surface and FIG. 3 showing a part of the cut plane. First, the passive operation part (4) is provided with a pair of support stands (6), (6) which are erected on both sides so as to face each other.
A support shaft (7) is laid between the support shaft (7) and a pair of cam-shaped operating disks (8) and (9) are attached to the support shaft (7).
The working discs (8) and (9) are rotatably and slidably mounted, and the working disks (8) and (9) are mounted on the support shaft (7) between the supporting plates (6) and (6) facing each other. The compression springs (10), (10) provided in between are biased inwardly and normally joined to each other. Since the pair of operating disks (8) and (9) are symmetrical with each other,
In order to simplify the description, the same components are designated by the same reference numerals and described below. That is, two recesses (11), (11) of the same shape are formed on the outer surface of each recess corresponding to the two insertion holes (5a), (5b). The operation receiving surface (11a) and the engaging surface (11b) continuous with the operation receiving surface (11a) are formed on the concave wall side of the, and the return receiving surface (11c) is formed on the other concave wall side. A cam-like groove (11d) is formed in a thin semi-circular portion on the side opposite to the surface where the concave portions (11), (11) are formed.
Further, as shown in FIGS. 1 and 3, the expanding piece (2b) of the switching actuator (2) is provided on the inner surface side of the joint at the portions of the peripheral end surface facing the respective insertion holes (5a), (5b).
Is formed with a guide notch (11e) for guiding an acute-angled portion of the tip. Further, as shown in FIG. 3, a rotation preventing notch (11f) is formed at a proper position on the inner surface, and as shown in the figure, the operating circles are normally joined to each other by the compression springs (10) and (10). The rotation preventing notches (11f) and (11f) of the plates (8) and (9) surround the locking projections (12) on the substrate of the switch body (1), so that the operating circles The plates (8) and (9) are stopped by the locking projections (12).

Further, a passive body (14) is fixed to the tip of a switch switching shaft (13) projecting freely from and into the switch box of the switch section (3).
4) and the switch box of the switch part (3), the return spring (15) inserted through the switch switching shaft (13).
The switch switching shaft (13) is biased toward the passive operation part (4) by the pair of locking pieces (14a), (14a) projecting from both sides of the passive body (14).
Are positioned by abutting on the respective supporting bases (6), (6) facing each other. In addition, a pair of arm portions (14b) and (14b) that are bent in both sides of the passive body (14) and project in parallel with the operating disks (8) and (9) with a gap therebetween are provided. Engaging pins (14c) and (14c) are planted at the tip end portions toward the cam-shaped grooves (11d). The engagement pins (14c), (14c) face the upper end of the cam-shaped groove (11d) as shown in FIG. 2 in a normal state when not operated by the switching actuator (2).

Further, in the switch part (3), a moving member (16) internally movably in the left-right direction in FIG. 2 is connected to the switch switching shaft (13) so as to move integrally with the moving member (16). ), A pair of movable contacts (17), (1
8) is provided, and each movable contact (17), (1
8) and the individual terminal boards (19), (2) facing each other.
Fixed contacts (21), (22) fixed to the tip of (0)
However, due to the movement of the moving member (16), each movable contact (1
7) and (18) are arranged so as to contact with each other. At normal times, the movable contact (17) is pressure-connected to the normally-closed fixed contact (21) by the urging force of the internal return spring (23), as shown in FIG. Each terminal board (1
9) and (20) are inserted and connected to a power supply circuit of an industrial machine or the like whose operation is to be controlled.

Next, the operation of the above embodiment will be described. Now, the switching actuator (2) is attached to the end surface of the door in a protruding state, and the switch body (1) is attached.
When the switching actuators (2) are arranged so as to face each other so as to be inserted through the insertion holes (5a) or (5b) when the door is closed, the doors are opened and the switching actuator (2) causes the switching main body (1) to move. ) Is removed from the return spring (1) as shown in FIGS. 2 and 3.
5), switch switching shaft (13) by the urging force of (23)
Moves to the front side and the locking piece (14) of the passive body (14)
a) and (14a) are positioned in contact with the support bases (6) and (6), and in the switch part (3), the moving member (16) moves to the left in FIG. 17) is electrically connected to the normally closed fixed contact (21). Further, in the passive operation section (4), the compression spring (10),
The operating discs (8) and (9) are joined to each other by the urging force of (10), and the respective rotation stop notches (11f) and (1
Since 1f) overlaps with each other and surrounds the locking projection (12), both operating disks (8) and (9) are prevented from rotating by the locking projection (12).

When the door is moved in the closing direction and the switching actuator (2) is inserted into the passive operation section (4) of the switch body (1) through the insertion hole (5a) shown in FIG. 2, for example, First, the sharp tip portion of the expanding piece (2b) of the switching actuator (2) is overlapped with each guide notch (1) of the working disks (8) and (9) in the direction of the arrow in FIG.
By being inserted between 1e) and (11e), the expanding piece (2b) compresses both operating disks (8) and (9) as shown in FIG. (10), (1
0) pushes each side against the urging force and slides on the support shaft (7) to move it outwardly, and the detent notch (11)
f) and (11f) are disengaged from the locking projection (12), and the whirl-stops of both operating disks (8) and (9) are first released. Next, when the expanding piece (2b) is completely inserted between the working discs (8) and (9) as shown in FIG. 5 showing a part of the cutting plane, each working disc ( 8) and (9) are moved in the separating direction to the position where the engagement pin (14c) is engaged in each cam-shaped groove (11d). At the same time, the operating hooks (2e), (2f) of the operating pieces (2c), (2d) on both sides of the switching actuator (2) are recessed (11), (1).
1) After moving in the inside without any trouble, it abuts against the operation receiving surfaces (11a) and (11a) as shown in FIGS. 2 and 5, respectively.

After that, when the switching actuator (2) is further inserted, the operating hooks (2e) and (2f) on both sides are inserted.
The operation receiving surfaces (11a), (11a) are pressed by the two operation disks (8), (9) to rotate in the counterclockwise direction in FIG. 2, and accordingly, the engagement pin (14c) that functions like a cam follower. ), (14c) are cam-shaped grooves (11d),
Since it is moved to the right in FIG. 2 while sliding along with (11d), the switch switching shaft (13) integrated with the passive body (14) having the engaging pins (14c) and (14c) is shown in FIG.
2 is pressed and moved to the right, and the moving member (16) of the switch part (3) is also moved to the right in FIG. Then, as shown in FIG. 6 and FIG. 7, respectively, the operating hook portions (2e) and (2f) of the switching actuator (2) move from the operation receiving surfaces (11a) and (11a) to the locking surfaces (11b) and (11b). 11
When the operating disks (8), (9) are rotated to reach the state of (b), the movable contact (17) is separated from the normally-closed fixed contact (21) and then becomes the normally-opened fixed contact (22). The switch portion (3) is switched by making contact.

As described above, the switching actuator (2) is inserted from the elongated insertion hole (5a), and the compression spring (1) is formed by the expansion piece (2b) whose tip has an acute angle.
0) and (10) are moved by moving the pair of operating disks (8) and (9) that are superposed by the urging force of the locking projections (12) to release the detent. Further, by moving in the separating direction, the engagement pins (14c) are externally engaged with the respective cam-shaped grooves (11d) of the respective working discs (8), (9), and while maintaining this state, The operating discs (8) and (9) are provided with recesses (11) and (11) on the outer surfaces of the operating discs (11a) and (11).
Switch part (3) by pressing and rotating a)
It is impossible to artificially operate, for example, by inserting a plurality of types of members from the elongated hole-like insertion holes (5a) to perform the above-mentioned operation. The switch part (3) cannot be operated externally unless a dedicated switching actuator (2) fixed to the door is used.

When the switching of the switch section (3) is completed, as shown in FIGS. 6 and 7, respectively,
The return receiving surface (11c) of the concave portion (11) is located on the side of the pull-out direction of the operating hooks (2e), (2f), that is, on the rear side. Therefore, even if the movable contact (18) is welded to the fixed contact for normal opening (22), the switching actuator (2) is pulled out from the insertion hole (5a) when the door is opened next time. When moving, as shown in FIG. 8, the operating hooks (2e) and (2f) are moved to the return receiving surface (11).
c), (11c), the operating discs (8), (9) are forcibly rotated in the clockwise direction in the figure, and the cam-like grooves (8), (9) of the rotating operating discs (8), (9) are rotated. The switch pins (13) and the moving member (16) are formed by the engagement pins (14c) and (14c) slidingly contacting and slidingly contacting with 11d) and (11d).
Is pulled to the left and the movable contact (18) is forcibly separated from the fixed contact (22) for normal opening. Therefore, it is possible to reliably prevent the malfunction of the conventional switch portion that occurs because the separated contacts that have been welded depend only on the restoring force of the return spring.

[0023]

As described above, according to the safety switch device of the present invention, the switch body and the switching actuator for switching the switch part from the outside are separately provided, and the movable member such as the door or the protection door is provided. The movable member is separately arranged at a position close to the moving range of the movable member and is inserted into the switch body through the insertion hole of the switching actuator. The press-fitting between the discs causes the actuating discs to be pushed away from each other against the urging force in the joining direction, and in the process of movement of the actuating discs, the recesses on the outer surface of each actuating disc By engaging the operating hooks at the tips of the pair of operating pieces on both sides of the switching actuator, and engaging the engaging pin in the cam-shaped groove, and then further inserting the switching actuator. By the hook The recess is pressed to rotate the operating disc, and along with this rotation, the engaging pin slides in contact with the cam-shaped groove of the operating disc to move backward, and the passive body having this engaging pin is the tip. Since the switch portion is fixed by moving the switch switching shaft fixed to the switch portion, for example, it is quite possible to switch the switch portion by an artificial external operation by inserting multiple kinds of members from the long hole insertion holes. This is impossible, and the switch section cannot be operated externally unless a dedicated switching actuator fixed to the door or the like is used, which is extremely reliable and safe.

If the operation receiving surface and the return receiving surface are provided on the concave walls on both sides of the concave portion of the operating disk, the operating hook portion returns when the switching actuator is removed from the switch body. Since the operating disk can be forced to rotate in the opposite direction by pressing the bearing surface, even if the switching contact of the switch part is welded, it can be forcibly and reliably separated to cause malfunction of the switch part. Can be reliably prevented.

Further, a locking protrusion is formed at a joint portion of both operating discs on the substrate of the switch body, and a detent lock for engaging the locking protrusion on each joint inner surface of each operating disc. If each notch is formed, both operating discs can be prevented from rotating unless they are separated from each other, and the artificial switching operation can be more completely prevented. Since it can be stopped and held, malfunction can be prevented more reliably and further safety is ensured.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a cutaway right side view of the state before actuation by the switching actuator.

FIG. 3 is a partial cutaway plan view in the state of FIG.

FIG. 4 is a partial cutaway plan view showing a state in which the detent is released by the switching actuator.

FIG. 5 is a partial cutaway plan view showing a state in which engagement by the switching actuator has been completed.

FIG. 6 is a cutaway right side view of the same state after switching of the switch section.

FIG. 7 is a partial cutaway plan view in the state of FIG. 6 above.

FIG. 8 is a partially cutaway right side view showing a state in which the switching actuator has started to move in the pull-out direction when the contacts of the switch section are welded.

[Explanation of symbols]

 1 Switch Main Body 2 Switching Actuator 2b Spreading Piece 2c, 2d Operating Piece 2e, 2f Operating Hook Part 3 Switch Part 4 Passive Operating Section 5a, 5b Insertion Hole 7 Spindle 8, 9 Working Disk 10 Compression Spring (Working Disk) Urging means) 11 recessed portion 11a operation receiving surface 11c return receiving surface 11d cam groove 11f detent notch 12 engaging protrusion 13 switch switching shaft 14 passive body 14c engaging pin

Claims (3)

[Claims] 1. In a safety switch device that is turned on and off by opening and closing a door, etc., a switching actuator attached to a movable member such as a door, and the switching actuator being inserted and removed from an elongated insertion hole. And a switch body in which a built-in passive operation section is operated to switch the switch section.
A strip-shaped expanding piece with an acute-angled tip and a pair of operating pieces with operating hooks formed on both ends of the expanding piece in parallel with each other at intervals are flat plates. The passive operation part of the switch body is urged so as to overlap with a pair of symmetrically-shaped operating disks rotatably and slidably mounted on a support shaft. At the same time, the expansion pieces are arranged between the two working disks so as to insert the respective working disks while pushing them in the direction of separation from each other, and the expanding pieces are provided on the outer surfaces of the respective working disks. A concave portion that engages with each of the operating hook portions during a process of moving in the separating direction by inserting the piece, and a pair of engagement pins of a passive body fixed to the tip of the switch switching shaft of the switch portion are engaged. And a cam-shaped groove for performing the cutting operation after engaging the recess and the operating hook with each other. Each of the operating disks is rotated by the inserting operation of the actuator for use, and the engagement pin is slidably contacted with the cam-shaped groove to operate the switch switching shaft to switch the switch portion. Switch device for safety. 2. The safety switch device according to claim 1, wherein the operating hook is pressed into the recess so as to rotate the operating disk in the forward direction when the switching actuator moves in the inserting direction. A passive receiving surface and a return receiving surface that is pressed by the operating hook to rotate the operating disc in the opposite direction when the switching actuator moves in the pulling direction are formed in both concave walls. Safety switch device characterized by the above. 3. A locking projection is formed on a joint portion of the operating disks on a substrate of the switch main body, and the locking projection is engaged with an inner joint surface of each of the operating disks. The detent notches are respectively formed, and the detent notches are configured to separate from the locking protrusions by moving the operating disks in the separating direction by inserting the expanding pieces. The safety switch device according to claim 1 or claim 2.