JP3362288B2 - Safety device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety fence provided to prevent a person from approaching a dangerous machine and ensure safety, in which an entrance door of the safety fence is in an open state. The present invention relates to a safety device that can output a signal depending on whether it is in a closed state or a closed state and can use the signal for ensuring safety.

[0002]

2. Description of the Related Art In a case attached to the peripheral portion of the entrance and exit, an operation key to be attached to the door is pushed and rotated by the operation key when the operation key is inserted from an insertion hole of the case, and a cam thereof. There is a safety device which comprises a switch adapted to generate a signal corresponding to a non-actuated state in which the cam has not yet been pushed and a pushed-in actuated state. In such a safety device, when the door is open, a signal corresponding to the open state of the door is emitted from the switch, and the signal is transmitted to an operator who works near the machine inside the safety fence. In order to ensure the safety of the above, it can be used as a signal for suppressing the operation of the above machine. On the other hand, when the door is closed, the switch outputs a signal corresponding to the closed state of the door, and the signal is used as a safety confirmation signal, which can be used to operate the machine in the safety confirmation state. .

[0003]

However, in the safety device having the above construction, a rod-shaped tool always carried by an outsider when the door is opened and the worker is working near the machine. For example, if a driver is mischievously inserted through the insertion hole, the driver will push the cam around and the switch will erroneously issue a signal corresponding to the closed state of the door, thus working near the machine. There is a problem that it puts the worker in danger.

The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. Even if the above rod-like object is inserted when the door is open, the door is accidentally closed. It is an object of the present invention to provide a safety device capable of surely preventing a signal corresponding to the above from being emitted.

[0005]

In order to achieve the above object, the safety device according to the present invention is provided at either one of the peripheral portion of the entrance and exit of the safety fence and the door for closing the entrance and exit. In the case provided with the mounting portion, the operation key provided on the other of the peripheral portion and the door is pushed and rotated by the operation key when it is inserted from the insertion hole provided in a part of the case. So that a cam having a tip end receiving portion for receiving the tip end of the operation key is rotatably provided, and the cam is not pushed and turned depending on the operating state. In a safety device including a switch connected to the cam so as to generate a corresponding signal, the cam is normally locked to the side in the direction of the rotation axis of the cam in the non-operating state, Is it the above insertion hole? In a state where the inserted are operated key is moved in the direction away from the cam in which the locking body which is adapted the locking melts were allowed with retractably to said rotary shaft center direction.

[0006]

When the operation key is not inserted, the cam is in a non-actuated state and the switch outputs a corresponding signal. When the operation key is inserted from the insertion hole, the locking body is separated from the cam by the operation key, the cam is unlocked, and the cam is pushed and turned by the key to become the operating state, and the switch becomes the operating state. The corresponding signal is emitted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing an example of a safety facility for machines,
1 is a machine that requires a safety facility, 2 is a safety fence that is provided so as to surround the machine 1 in order to prevent people from approaching it, and part of it is provided with an entrance / exit 3 for entrance and exit of workers. It is provided and there is a door 4. Reference numeral 5 is a safety device for confirming the open / closed state of the door 4, locking the closed state, and confirming that the door 4 is locked, and 7 is an operation key for operating the safety device.

Next, FIG. 2 showing the safety device 5 in detail.
3 and 4 will be described. Reference numeral 10 denotes a case, which forms a base frame for combining various built-in configurations with each other, stores them so as not to be seen from the outside, and protects the internal electric mechanism from oil and water. It is a thing. Reference numeral 11 denotes a concave main body of the case 10, and 12 is a lid for detachably closing the opening of the main body 11, all of which are made of metal or synthetic resin material. Reference numeral 13 is a screw rod for fixing the lid 12 to the body 11, and 14 is a waterproof packing interposed between the body 11 and the lid 12. Reference numeral 15 denotes a mounting portion provided on the main body 11, which is a portion for mounting the safety device 5 on the safety fence 2 and has a through hole 16 for inserting a mounting screw rod. Is illustrated. Reference numeral 17 denotes a partition wall provided inside the main body 11 for partitioning the space inside the main body 11 into the cam chamber 18 and the switch chamber 19, and is formed integrally with the main body 11. Next, reference numeral 21 is an insertion hole for inserting the operation key 7. The width and thickness of the operation key 7 are set so that the plate-like operation key 7 smoothly enters and a member wider or significantly thicker than that is prevented from entering. It is formed in a slit shape having a corresponding size. Reference numeral 22 is another insertion hole, which is used when the safety device 5 is used in a place where the operation keys are inserted from the front side thereof, and is formed similarly to the insertion hole 21. .

Next, reference numeral 24 denotes a rotatable cam provided in the case, which is formed of a material having high durability and hardness such as steel. The thickness T of the cam 24 shown in FIG.
It is designed to have sufficient strength to lock the operation key 7 in the closed state. Reference numeral 25 shown in FIG. 4 is a receiving portion for receiving the engagement portion at the tip of the operation key 7, and is exemplified by a recessed portion. Reference numeral 26 denotes a tip receiving portion for receiving the tip of the operation key 7, which is a surface along the radial direction of the cam 24 so as to be pushed and rotated by the operation key 7. For example, one side of the receiving portion 25 (see FIG. 11 is formed from the non-operating state to the operating state of FIG. 27 is the above insertion hole
A rotation blocking body for blocking the rotation of the cam 24 when a fork-shaped foreign substance is inserted from the cam 21, and the cam 24 expands in the radial direction of the cam 24 at a position closer to the insertion hole 21 than the tip receiving portion 26. It is formed in a protruding shape. For example, it is configured by a wall portion on the other side of the receiving portion 25 (rear side in the pushing and turning direction). The blocking body 27 is located on the rear side of the engaging portion of the operation key 7 as described later and also functions as a locking portion for preventing the backward movement thereof. 28 is a deflecting member for preventing the plate-shaped object other than the operation key 7 from reaching the tip receiving portion 26,
It is arranged near the insertion hole 21 of the tip receiving portion 26 to prevent the above-mentioned arrival, and the tip receiving portion 26 is provided so as not to prevent the tip of a predetermined operation key from reaching the tip receiving portion 26. The width is smaller than that. In this example, as shown in FIG. 7, the cam 24
A plate-like structure having the same radius as the outermost radius of the cam 24 in the middle portion in the thickness direction of the cam 24 and being integrally formed with the cam 24 is illustrated. Reference numerals 25 ', 26', 27 ', and 28' denote a receiving portion, a tip receiving portion, a rotation blocking body, and a deflecting member provided corresponding to the insertion hole 22, respectively. Reference numeral 29 is an engaging claw provided to lock the operating state of the cam 24 and prevent the cam 24 from returning to the non-operating state. Reference numerals 31 and 32 in FIG. 6 denote engaging portions for receiving locking by a locking body, which will be described later, and exemplarily those formed in a concave shape on one and the other side surfaces of the cam 24. Next, reference numeral 33 denotes a shaft body rotatably provided in the main body 11 for rotatably supporting the cam 24 and transmitting the rotation of the cam 24 to a switch described later. A connecting member 34 (for example, a pin) shown in FIG.

Reference numeral 36 shown in FIG. 4 is a lock member for locking the operation state of the cam 24 to prevent its return, and has a claw portion 37 for engaging with the engaging claw 29 at the tip thereof, The partition wall 17 is mounted so that it can move back and forth in the direction of the arrow. 38 is a lock 36
Is a biasing spring for biasing the cam 24 in the direction of engaging with the cam 24, and is interposed between a spring seat 39 fixed to the lock body 36 and a spring seat 40 formed by a part of a solenoid described later. . Next, 41 is a release device for releasing the lock of the cam 24 by the lock body 36, and shows a well-known solenoid as an example.
42 is a frame in the solenoid, 43 is a yoke, 44 is a fixed iron core, 45 is a coil, and 46 is a plunger that can move back and forth, respectively, and the lock body 36 is connected by a connecting pin 47 so as to be able to move integrally. is there. 49 and 50 are the solenoids
A switch for detecting the operating state of 41, for example, a micro switch, is attached to a mounting plate 48 fixed to the main body 11.
49a and 50a are movable parts of these switches, and 49b and 50b are connection terminals. Reference numeral 51 denotes a switch operation piece for operating the switches 49 and 50, which is constituted by, for example, a pin, and has an intermediate portion attached to the lock body 36 and one end portion and the other end portion facing the movable portions 49a and 50a. .

Next, reference numeral 53 shown in FIG. 3 is a switch for generating a signal corresponding to the turning state of the cam 24, and is an example of a rotary switch linked to the shaft body 33. Hereinafter, FIGS. 3, 8 and 9 showing this switch will be described. A base frame 54 is made of an insulating material such as a synthetic resin material for holding the fixed contacts, and is attached to the main body 11 with a mounting screw 55. 56 is a fixed contact for transmitting a door closing signal, and 57 is a fixed contact for transmitting a door opening signal, each of which is provided as a pair. 56a,
57a is a connection terminal at those contacts. A movable contact holding block 58 is formed of an insulating material such as a synthetic resin material for holding the movable contact in an electrically insulated state. Reference numeral 59 is a housing portion for the movable contact, and 60 and 61 are positioning portions for positioning the rotational position of the block, which are formed in a concave shape. Reference numeral 62 denotes a movable contact for transmitting a door closing signal provided in the accommodating portion 59, and 63 denotes a movable contact for transmitting a door opening signal. 64 is a spring for pressing the movable contact against the fixed contact, and is interposed between the movable contacts 62 and 63. 65
Is a connecting piece for connecting the shaft body 33 and the block 58, and a pin driven into the block 58 is illustrated. Reference numeral 66 is a transmission portion formed on the shaft body 33 for connecting with the connecting piece 65, and is exemplified as a recessed portion, and is rotated to allow a slight play in the rotation direction between the shaft body 33 and the block 58. It is formed slightly larger than the connecting piece 65 in the direction. Reference numeral 67 is a holding spring for holding the block 58 at the door opening signal transmitting position shown in FIG. 8 and the door closing signal transmitting position shown in FIG. 9, which are recessed for fitting with the positioning portions 60 and 61. It is formed in a convex shape corresponding to the positioning portions 60 and 61, and the base portion is fixed to the base frame 54. Both the positioning portions 60 and 61 may be formed in a convex shape, and the holding spring 67 may be formed in a concave shape corresponding to the convex shape.

Reference numeral 70 shown in FIG. 3 shows a locking mechanism for locking the cam 24 in a non-operating state. 71 and 72 are locking bodies for locking the cam 24 in a non-operating state.
On the other hand, on one side and the other side in the direction of the rotation axis, the cam 24 is attached to the shaft body 33 so that the cam 24 can freely move back and forth in the direction of the rotation axis. Further, the locking bodies 71 and 72 are both prevented from rotating. For example, 73 is an engaging portion for preventing the rotation of the locking bodies 71, 72, which is fitted to the rotation stop piece 74 fixed to the side wall of the main body 11 and the partition wall 17. The relationship between each engagement portion 73 and the rotation stop piece 74 is such that the former can move back and forth in the longitudinal direction along the latter, so that there is no obstacle to the forward and backward movement of the locking bodies 71, 72 in the axial direction. I am doing it. Each of the locking bodies 71, 72 normally locks the cam 24 in a non-actuated state, and is unlocked by moving in a direction away from the cam 24. For example, 75, 76
Is a locking member provided on the locking bodies 71, 72,
By moving back and forth, the engagement and disengagement of the cam 24 with respect to the engaging portions 31, 32 can be performed. 77, 78 are cams for each locking body 71, 72
A conical coil spring is used as a biasing spring for pushing toward the 24 side. The surfaces 71a, 72a of the respective locking bodies 71, 72 on the cam 24 side are provided with the locking bodies 7 by inserting the operation key 7.
Pushing away 1,72 (moving away from the cam 24)
As shown in the figure, it is formed on a slope so that it can be smoothly performed.

Reference numeral 83 shown in FIGS. 2 and 3 is an indicator lamp for indicating whether the door 4 is in the open state or the closed state by lighting or extinguishing, and 84 is the operating state of the cam 24 by lighting or extinguishing. Is a display lamp for indicating whether the lid 12 is locked or unlocked, and both are exposed in a through hole provided in the lid 12 so that it can be confirmed from the outside of the lid 12. Reference numeral 85 is a connector attached to the main body 11, which is a control device for controlling the machine 1 and the solenoid 41 and switches 49, 50, 53 in the safety device 5.
It is a member for making electrical connection with.

Next, the operation key has a mounting portion for mounting it on the safety fence 2, for example, the door 4, for example, a through hole for inserting a mounting bolt, and the tip portion thereof has the above-mentioned structure. Due to the engagement with the cam 24, the structure is as shown in FIGS. In these figures, the width L1 of the operation key 7 is such that when the key 7 is inserted through the insertion hole 21, the locking members 71, 72 on both sides are separated from the cam 24, respectively. Has a width sufficient to disengage from the engagement holes 31 and 32. Reference numeral 92 is an engaging portion, which is a portion for entering the receiving portion 25 of the cam 24 to engage with the cam 24, and 93 is a portion through which the deflecting member 28 is passed so that the tip of the operation key 7 is the tip receiving portion.
It is a break for allowing the wheel to reach 26, and is formed in the substantially central portion between both side edges of the key 7. Reference numeral 94 denotes a contact avoiding hole provided at a portion facing the rotation preventing body 27 in a process of pushing and rotating the cam 24 by the tip of the key 7 so as to avoid contact of the rotation preventing body. Further, reference numeral 96 is a guide portion provided to smoothly push and hold the locking bodies 71 and 72, and is formed on the slope as shown in the drawing. In the state where the door is closed and the operation key 7 is engaged with the cam 24, the forming material and thickness of the operation key 7 having the above-described configuration, the width L1 of the engaging portion 92, and the width L4 of the side wall portion 95 are set. , The door 4 is designed to have sufficient strength to maintain the closed lock. The width L2 and the length L3 of the contact avoiding hole 94 are determined by the cam.
It is formed in such a size that the rotation blocking bodies 27 of 24 can be sufficiently received.

The usage of the safety device 5 having the above structure is as follows. First of all, the safety device 5 is attached to the mounting portion 15 of FIG.
As described above, for example, it is attached to the peripheral edge portion 3a of the entrance / exit 3. The operation key 7 is attached to the door 4 at a position where the safety device 5 can enter the insertion hole 21. The safety device 5 is connected to a control device (not shown) using the connector 85. The safety device 5 and the operation key 7 may be attached at mutually different places.

When the door 4 of the safety fence 2 having the above-mentioned safety device is opened, the cam 24 is in the non-operating state as shown in FIG. 4 and the movable contact block 58 of the switch 53 is at the position shown in FIG. The movable contact 63 for transmitting the door open signal is the fixed contact 57
, And a door open signal is issued from the contact 57. This signal is used, for example, to prohibit the operation of the device 1.

Next, when the door 4 is closed, the engaging portion 92 of the operation key 7 passes through the insertion hole 21 and the cam 24 as shown in FIG.
Enter toward the receiving section 25 of. In this case, the deflecting member 28
Enters into the cut 93 of the operation key 7, the entrance of the engaging portion 92 toward the receiving portion 25 can be carried out without any trouble. or,
Along with the entry, the left and right locking bodies 71, 72 of the locking mechanism 70 are pushed by the both side edges of the operation key 7 in the directions away from the cam 24 as shown in FIG. 6B. As a result, the locking members 75, 76 are disengaged from the engaging portions 31, 32 as shown in the figure. When the operation key 7 further continues to enter, the tip 91 of the operation key 7 is received by the tip receiving portion.
10 and pushes the tip receiving portion 26 to rotate the cam 24 in the direction of arrow (A) in FIG. 10, and when the door 4 is completely closed, the cam 24 is rotated to the operating state as shown in FIG. . When the cam 24 is rotated to the operating state in this way, the claw portion 37 of the lock body 36 engages with the engaging claw 29 as shown in the figure, and prevents the return rotation of the cam 24. Further, in this case, the rotation preventing body 27 of the cam 24 is positioned in the contact avoiding hole 94 of the operation key 7 as shown in the drawing. Therefore, the operation key 7 cannot be returned because the engaging portion 92 is locked by the rotation preventing body 27, and the door 4 is locked in the closed state.

When the cam 24 is rotated to the operating state as shown in FIG. 11, the movable contact block 58 of the switch 53 is rotated to the state shown in FIG. 9, and the movable contact 62 for transmitting the door closing signal is generated.
Bridges the fixed contact 56. As a result, the fixed contact 56 transmits a door closing signal. This signal is used, for example, as a confirmation signal for permitting the start of operation of the machine 1. In the closed state, the cam 24 slightly rattles in the rotating direction due to the vibration of the door 4 and other causes, and even if the movement is transmitted to the shaft body 33, the gap between the transmission portion 66 and the connecting piece 65 is as described above. Since there is such play and the holding spring 67 is fitted with the positioning portion 61, the movable contact block 58 does not rattle, and therefore the movable contact
The bridging state of the fixed contact 56 by 62 is maintained stably (no chattering occurs).

Next, when it is desired to open the door 4 of the safety fence 2, the unlocking device 41 unlocks the cam 24. When the coil 45 of the solenoid is energized, the plunger 46 fixes the iron core.
The movement is transmitted toward the lock body 36 to disengage the claw portion 37 from the engaging claw 29. Then cam
24 will be free. When the door is opened in this state, the engaging portion 92 of the operation key 7 is retracted while rotating the cam 24 back toward the non-actuated state of FIG. 4, and is withdrawn from the insertion hole 21 of the safety device 5. The movable contact block 58 of the switch 53 is moved as shown in FIG.
Then, the movable contact 63 is brought into pressure contact with the fixed contact 57 and a door open signal is issued. Thereafter, when the coil 45 is de-energized, the lock body 36 returns to the position shown in FIG. 4 by the urging force of the spring 38. The cam 24 may be returned to the non-operating state by attaching a spring to the cam 24 or the shaft body 33 to rotate them so that the cam 24 or the shaft 33 can be rotated by the spring.

Next, in the safety device 5 having the above structure,
Since the locking body 71 is provided on the side of the cam 24 in the direction of the rotation axis, for example, when the door 4 is open, the tip of a driver is inserted from the insertion hole 21 toward the inside and the cam 24 is pushed. Also, the cam 24 remains inactive. That is, even if the tip of the driver inserted as described above contacts the tip receiving portion 26, the cam 24 cannot be rotated because the locking body 71 locks the non-actuated cam 24. Therefore switch 53
There is no accidentally issuing a door closing signal.

Further, locking bodies 7 are provided on both sides of the cam 24 in the direction of the rotation axis.
Since 1, 72 are provided, even if one of the locking bodies 71 is disengaged from the cam 24 by prying the inserted driver, even if the locking of the cam 24 is released by the locking body, the other locking body
Since the lock of the cam 24 is continued by 72, the cam 24 cannot be rotated and the switch 53 does not erroneously issue a door closing signal.

Next, the insertion hole of the tip receiving portion 26 of the cam 24
21 Since the deflecting member 28 is arranged near the position, the tip receiving part
When a foreign substance having a plate-like cross section when viewed from the side of 26, for example, a steel rule having the same width as the operation key 7 is inserted through the insertion hole 21, the foreign substances cause the locking bodies 71 and 72 on both sides to be pushed away, and the cam Even if 24 is unlocked, the tip of the foreign matter is deflected
The reference numeral 102 shown in FIG.
It is deflected as shown by and cannot reach the tip receiving portion 26. Therefore, the non-actuated cam 24 cannot be rotated, and the switch 53 does not erroneously issue a door closing signal.

Next, since the cam 24 is provided with the rotation preventing body 27, a fork-shaped rod-like foreign substance when viewed from the tip receiving portion 26 side of the cam 24, for example, as shown in FIG. One plate
Even if 100, 100 (for example, two flat-blade screwdrivers) are arranged side by side and inserted from the insertion hole 21, the cam 24 cannot be rotated to the operating state. That is, the plate body
The tip of the 100, 100 is deflected between the two so as to reach the tip receiving portion 26 so that the member 28 is inserted, and in this case, the left and right locking bodies 71, 72 are pushed away by the left and right plate bodies 100, 100 to lock the cam 24. Even if you solve
When the cam 24 is pushed around by 0,100, the rotation blocking body 27 causes the insertion hole 21 and the tip receiving portion 26 as shown in FIG.
Since it abuts on the intermediate portion 101 of the plate body 100 located between and, the cam 24 cannot rotate any more and the switch 53 does not erroneously issue a door closing signal.

Next, FIG. 12 shows another embodiment of the operation key, in which the tip 91 of the operation key 7e is provided on both side edges of the key tip.
Before e comes in contact with the tip receiving part of the cam and pushes the cam around, the locking bodies on both sides of the cam are surely separated from the cam in advance, and projections 97, 97 for unlocking the cam are provided. It shows an example. The interval between the protrusions 97, 97 is made larger than the thickness of the cam so that the contact of the tip 91e with the tip receiving portion is not hindered. In addition, parts that are considered to be the same or equivalent in configuration to those in the previous figure in terms of function are denoted by the same reference numerals as those in the previous figure with the letter e added to omit redundant description.

[0025]

As described above, in the present invention, when the safety device 5 is attached to the peripheral edge portion 3a of the doorway 3 of the safety fence 2, the door 24 is opened and the cam 24 is deactivated. Therefore, there is a feature that the switch 53 outputs a signal corresponding to the opened state of the door 4. Therefore, the signal is used to suppress the operation of the machine 1 inside the safety fence 2 and
There is an advantage that it can be used to ensure the safety of workers who work near.

On the other hand, by closing the door 2, the insertion hole
When the operation key 7 is inserted from 21, the engagement body 71 is separated from the cam 24 by the operation key 7 to release the engagement of the cam 24, and the key 7 pushes the cam 24 around. The switch 53 is activated and a signal corresponding to the closed state of the door 4 is emitted. Therefore, there is an advantage that the signal can be used as a safety confirmation signal that the machine 1 can be operated.

Moreover, when the door 4 is open, even if an outsider inserts a rod-like object such as a driver through the insertion hole 21 and hits the tip receiving portion 26 of the cam 24, the cam 24 is on its side. The non-operating state can be maintained by the locking by the locking body 71, and the signal corresponding to the closed state of the door can be prevented from being erroneously emitted from the switch 53, so that the operator near the machine 1 can be prevented. It has the effect of ensuring safety.

Further, in the present invention, the locking bodies 71, 72 are cammed.
In the case of disposing on both sides of 24, even if the outsider hits one locking body 71 by pushing one end of the inserted driver and pushes it away from the cam 24, and unlocks the cam 24, The other locking body 72 allows the cam 24 to continue to be locked in the non-operating state, which has the effect of maintaining the safety ensuring state.

Further, in the case where the deflecting member 28 is arranged in the present invention, the outsider can be the locking members 71,
Even if a plate-like foreign substance 102 such as a wide steel strip that can push both 72 away from the cam 24 is inserted, the deflecting member 2
8 has the effect of deflecting the tip of the plate-like foreign matter to prevent it from reaching the tip receiving portion 26, preventing the cam 24 from rotating, and maintaining the safety secured state.

Further, in the present invention, the cam 24 is provided with a rotation stopper.
In the case of including 27, the outsider inserts the fork-shaped rod-shaped foreign substance 100 from the insertion hole 21, so that the locking bodies 71 and 72 on both sides are both pushed away from the cam 24 and the deviation is caused. Even if the tip of the rod-shaped foreign substance reaches the tip receiving portion 26 by passing through the member 28 and the cam 24 is about to be pushed and rotated, the rotation blocking body
It is possible to prevent the cam 24 from rotating to the operating state by the contact of the intermediate portion 101 of the rod-shaped foreign object 100 with the cam 27, and it is possible to maintain the above-mentioned safety secured state.

[Brief description of drawings]

FIG. 1 is a perspective view showing a usage state of a safety device.

FIG. 2 is a front view of a safety device.

FIG. 3 is a front view of the safety device with a lid removed.

4 is a sectional view taken along the line IV-IV in FIG.

5 is a cross-sectional view showing only the main body of the case taken along the line VV in FIG.

6A is a sectional view taken along the line VI-VI in FIG. 4,
FIG. 6B is a sectional view similar to FIG.

FIG. 7 is an exploded perspective view showing a relationship among a cam, an operation key, and a locking mechanism.

8A is a sectional view taken along line VIII-VIII in FIG.
(B) is the BB sectional view taken on the line in (A).

9A and 9B are views similar to FIGS. 8A and 8B in a state in which the cam is rotated into an operating state.

FIG. 10 (A) is a partial view showing a state where the tip of the operation key has reached the receiving portion of the cam, (B) is a perspective view showing a fork-shaped rod-shaped foreign substance, and (C) is a foreign substance shown in (B). FIG. 6 is a partial cross-sectional view showing a state in which the plug is inserted toward the receiving portion of the cam.

FIG. 11 is a partial cross-sectional view showing a state in which the cam is rotated to an operating state by an operation key.

FIG. 12 is a partial view showing an example in which the tip shapes of the operation keys are different.

[Explanation of symbols]

5 safety devices 7 operation keys 10 cases 21 insertion hole 24 cams 26 Tip receiver 27 Rotation block 28 Baffle member 53 switch 71, 72 Locking body

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Niwa, 6-10 Ushimaki-cho, Mizuho-ku, Nagoya-shi Sanmei Electric Machinery Co., Ltd. (72) Michihiro Nonoyama, 6-10 Ushimaki-cho, Mizuho-ku, Nagoya Electric Co., Ltd. (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16P 3/08

Claims (6)

(57) [Claims] 1. The inside of the peripheral edge and the door is provided in a case provided with a mounting portion for providing the peripheral edge of the doorway of the safety fence and the door for closing the doorway. Is provided with a tip receiving portion for receiving the tip of the operation key so that the operation key provided on the other side of the operation key is pushed and rotated by the operation key when the operation key is inserted from an insertion hole provided in a part of the case. A safety having a rotatably provided cam and a switch connected to the cam so as to generate a corresponding signal depending on a non-actuated state where the cam is not yet pushed and an actuated state where the cam is pushed. In the device, the cam is normally locked to the side in the direction of the rotation axis of the cam in the non-operating state, and is moved in a direction away from the cam by an operation key inserted from the insertion hole. State Then, the safety device is characterized in that a locking body capable of releasing the locking is provided so as to be movable back and forth in the rotation axis direction. 2. The safety device according to claim 1, wherein the locking bodies are provided on both sides of the cam in the direction of the rotation axis of the cam. 3. The foreign matter having a plate-shaped cross section when viewed from the tip receiving portion side is inserted into the cam at a position near the insertion hole of the distal end receiving portion of the cam, and deflects the foreign matter. The safety device according to claim 2, wherein a deflecting member having a width smaller than that of the tip receiving portion is provided in order to prevent it from reaching the tip receiving portion. 4. A fork-shaped rod-shaped foreign substance seen from the tip receiving portion side is inserted through the insertion hole at a position closer to the insertion hole than the tip receiving portion of the cam, and the cam is pushed around by the rod-shaped foreign substance. A swelling rotation-blocking body for blocking rotation of the cam by contacting the intermediate portion of the rod-shaped foreign matter between the insertion hole and the tip receiving portion on the way The safety device according to claim 3. 5. A case provided with a mounting portion for providing either one of a peripheral portion of an entrance and exit of a safety fence and a door for closing the entrance and exit, and the other of the peripheral portion and the door. And an operation key having a mounting portion for providing the operation key, and the operation key is pushed and rotated by the operation key when the operation key is inserted from an insertion hole provided in a part of the case in the case. As described above, a cam having a tip receiving portion for receiving the tip of the operation key is rotatably provided, and the cam corresponds to the non-actuated state where the cam is not yet pushed and the actuated state where the cam is pushed. In a safety device including a switch connected to the cam so as to generate the signal, the cams are normally locked to the both sides in the direction of the rotation axis of the cam in the non-operating state,
Locking bodies that can be unlocked in a state of being moved in a direction away from the cam by an operation key inserted from the insertion hole are provided so as to be movable back and forth in the rotation axis direction, Moreover, when a foreign material having a plate-shaped cross section when viewed from the tip receiving portion side is inserted through the insertion hole at the position near the insertion hole of the tip receiving portion of the cam, the foreign matter is deflected and the A deflecting member having a width smaller than that of the distal end receiving portion is provided to prevent the operation key from reaching the receiving portion, while the operation key is provided on both sides of the operation key when it is inserted from the insertion hole. Each of the locking bodies is formed in a plate shape having a width sufficient to separate from the cam, and the deflecting member is passed between the both side edges of the locking body so that the tip of the operation key reaches the tip receiving portion. Equipped with a break to allow you to Safety device, characterized in that the. 6. A fork-shaped rod-shaped foreign substance seen from the tip receiving portion side is inserted through the insertion hole at a position closer to the insertion hole than the tip receiving portion of the cam, and the cam is pushed around by the rod-shaped foreign substance. In the middle of the operation, a swollen rotation blocking body for blocking the rotation of the cam by contacting the intermediate portion of the rod-shaped foreign substance between the insertion hole and the tip receiving portion is provided, and the above-mentioned operation is performed. The key has a contact avoiding hole for avoiding contact of the rotation blocking body at a portion facing the rotation blocking body in the process of pushing the tip receiving portion by the tip thereof to rotate the cam. The safety device according to claim 5, wherein the safety device is provided.