JPH07127795A - Safety device - Google Patents

Abstract

PURPOSE:To provide a safety device of one kind which can be widely used for various kinds of uses such as a double hinged door, a hinged door and so on by disposing a switch and an operating part for releasing locking in a switch case, and disposing a cam for locking an operation key in a cam case provided on the switch case. CONSTITUTION:At the time of opening a door of a safety fence, an electric current is applied to a solenoid 58 to advance a movable iron core 60, and an operation part 56 is pressed by a driving pin 61. Whereupon, a transmission rod 55 is raised to press a release frame 47a, and a locking member 46 is separated from an engaging click 43 against a spring 49 so that the rotation of a cam 38 is put in the free state. When the door is opened, the engaging part 7b of an operation key 7 pulls a locking click 42 to rotate the cam 38 clockwise and retires from a through hole 32, and the cam 38 is put in the double acting state. After that, when application to the solenoid 58 is cut off, the movable iron core 60 and the locking body 46 are respectively returned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention locks a door of an entrance / exit for a worker in a closed state in a safety fence provided around a machine for ensuring safety, and confirms the lock. It relates to a safety device used for taking.

[0002]

2. Description of the Related Art The above-mentioned through hole is provided in a case which is adapted to be attached to an edge of an entrance and exit of the safety fence and which has a through hole for entering an operation key attached to the door when closing the door. The case is provided with a cam that is turned by an operation key that has entered through and is in an engaged state with the cam, and a locking body that prevents the cam from returning, and the cam is rotated by the operation key in the case. And a release member for unlocking the return of the cam by the locking body, and the cam and the switch, and the locking body and the releasing member are transmission members respectively. Are connected with each other.

In the above structure, when the door is closed, the operation key that has entered the case through the through hole engages with the cam, and the locking body prevents the cam from returning to lock the door. When the above is achieved, the switch is actuated via the transmission member and the lock confirmation signal is obtained from the switch. Further, when the user wants to open the door, the operator can intentionally operate the release member to release the lock, which has a feature that the operator can be made aware of safety.

[0004]

However, in the safety device having the above-mentioned structure, the through hole is attached to the safety fence according to each application in which the door is a right-handed or left-handed sliding door or a hinged door. There has been the problem of having to prepare separate safety devices on the right, left or front of the plane.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and the functions such as the door lock, the lock confirmation signal, and the lock release by conscious operation are unchanged. In addition, it is an object of the present invention to provide a safety device having one kind of door for each use, which is a right-hand or left-hand sliding door or a swing door.

[0006]

In order to achieve the above object, a safety device according to the present invention comprises a switch case for mounting in the vicinity of a peripheral edge of an entrance / exit of a safety fence, and a side surface pivotally attached to one end of the switch case. Has a cam case having a through hole for entering an operation key provided in a door for closing the doorway, and a switch is provided in the switch case, while a cam case is provided in the cam case. A cam is provided so as to be reciprocally rotatable, and a receiving portion for contacting the tip of the operation key that has entered through the through hole is provided on the outer periphery of the cam, and the operation key is rotated by the rotation of the cam due to the contact. The engaging portion for locating on the rear side of the engaging portion of the cam and the engaging claw for locking the forward movement state of the cam are provided, and the cam in the radial middle portion of the cam. How to rotate Is provided with a long hole for driving the switch, the distance of which from the center of rotation of the cam changes, and further, the cam case is prevented from returning by engagement with the engaging claw of the cam in the forward movement state. A locking body is provided to be engageable and disengageable, and a transmission rod and a transmission cylinder, which have a double-cylindrical shape, are coaxially penetrated to the pivotal portion of the cam case with respect to the switch case coaxially with the rotation axis of the cam case. The driven member located in the elongated hole is connected to the end of the transmission cylinder or the transmission rod inside the cam case, while the movable portion of the switch is connected to the end of the transmission cylinder or the transmission rod inside the switch case. The disengaged portion, which is connected to the locking body and is provided for disengaging the engagement claw, is arranged to face the end of the transmission rod or the transmission cylinder inside the cam case.
An operation portion for releasing the engagement of the locking body is provided at an end portion of the transmission rod or the transmission cylinder on the switch case side.

[0007]

When the operation key enters the cam case through the through hole, the tip of the operation key comes into contact with the receiving portion of the cam to rotate the cam, and the engagement portion of the cam is located behind the engagement portion of the operation key and the engaging portion is engaged. The stopper locks the engaging claw to prevent the cam from returning. Further, in this case, the rotating cylinder operates the transmission cylinder through the elongated hole for driving and the driven member, and the switch is operated by the transmission cylinder. When the lock releasing operation portion is manually operated, the transmission rod is actuated, the locking body is disengaged from the engaging claw, and the cam return blocking state is released. Since the transmission cylinder and the transmission rod have a double cylinder shape and are arranged coaxially with the rotation axis of the cam case with respect to the switch case, the transmission case can be mounted on the switch case in a state in which the two actuations can be transmitted. On the other hand, by turning the cam case, the through hole for entering the operation key can be directed to any side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1A showing an example of a safety facility for machines, 1 is a machine requiring a safety facility, 2 is a safety fence provided so as to surround the machine, and a part of the fence is used for the entry and exit of people. A doorway 3 is provided, and a door 4 is provided therein. 5 is a safety device for confirming that the door 4 is closed and locked, and 7 is an operation key for operating the safety device.

Next, FIGS. 2, 4 and 5 showing the safety device 5 in detail will be described. 11 is a switch case, 12
The main body of the main body has a hollow shape with an open front surface, and a guide hole 13 for guiding rotation of a cam case, which will be described later, is formed in the upper wall.
Is formed, and a plurality of screw holes 14 for fixing the cam case are formed on the circumference centered on the guide hole 13 and at the same intervals (for example, at positions 90 ° apart from each other). There is a through hole 15 for holding the release operation portion in the lower wall. Further, a plurality of through holes 16 for screwing, which are exemplified as mounting portions to the safety fence 2, are provided so as to penetrate from the front surface to the rear surface. Reference numeral 16a is a screw rod for attaching the main body 12 to the safety fence 2. 17 is the main body in case 11 above
A lid for closing the opening of 12 and a screw rod 18 for fixing. Next, 20 is a switch built in the main body 12 of the case, which has a well-known configuration as shown in FIG. 2C, and 21 is a case attached to the switch case main body 12,
21a is a groove for guiding the movable part, 22a is a fixed contact for normally closed, 22b is its connecting terminal, 22c is a fixed contact for normally open,
d is the connection terminal. 23 indicates a movable part, and 23a indicates a groove.
A movable frame that can be moved up and down along 21a, 23b is a through hole for connecting with other members, 23c is a movable contact housing, 24a is a normally closed movable contact, 24b is a normally opened movable contact, and 24c is a It is a spring for press-contacting a movable contact with a fixed contact.

Next, the cam case 25 pivotally attached to one end of the switch case 11 comprises a first element 26 and a second element 27,
In order to guide the rotation of the cam case 25 with respect to the switch case 11, there is provided a guide body 28 formed to have a size that can be fitted in the guide hole 13. The guide body 28 is formed in a tubular shape for guiding a transmission cylinder, which will be described later, and has an inner surface serving as a guide hole 29. Reference numeral 30 is a through hole for inserting a screw rod 31 for fixing the cam case 25 to the switch case 11, and the screw hole 14
It is formed so as to penetrate both elements 26, 27 at a position corresponding to. Reference numeral 32 designates a through hole formed in the element 27 for introducing an operation key.

Next, the cam mechanism provided in the case 25 will be described. Reference numeral 34 is a support frame, which has a shaft hole 35 for pivotally supporting the cam 38, a long hole 36 for guiding the driven member 52, a through hole 37 for penetrating the transmission cylinder 51, and the like. , Is attached to the first element 26 by means of a locking screw rod 34a. 38
Is a cam for locking the operation keys and operating the switch.
It is rotatably attached to the support frame 34 with 39. 40 is a recess for receiving the engaging portion 7b of the operation key 7,
One side wall thereof serves as a receiving portion 41 for receiving the tip end 7a of the operation key 7, and the other side wall serves as a locking portion 42 for locking the engaging portion 7b. Reference numeral 43 is an engaging claw provided to lock the forward movement state of the cam 38 and prevent the return thereof. Reference numeral 44 is a long hole provided in the middle of the cam for driving the switch, and is formed in a shape in which the distance from the center of rotation of the cam changes in the direction of rotation of the cam as shown. Next, 46 is a locking body for locking the engagement claw 43, which is pivotally attached to the support frame 34 with a shaft 48, and is directed toward the side contacting the outer peripheral surface of the cam 38 by a spring 49. I am urged. Reference numeral 47 is a connecting lever for engaging and disengaging, which is formed integrally with the locking body 46, and the tip thereof is a releasing portion 47a.

Next, reference numeral 50 denotes a mechanism for connecting the switch 20 and the cam 38. 51 is a cam case for the switch case 11.
With a transmission cylinder that is inserted into the guide body 28 that is the pivotally attached part of 25,
Guided by the guide hole 29, it can move up and down freely. Reference numeral 52 is a pin which is a driven member for the elongated hole 44 of the cam 38, the middle portion of which is located in the elongated hole 44, and both ends are left in the guide hole 36 for guiding the movement in the vertical direction. There is. An end of the transmission cylinder 51 inside the cam case is connected to the driven member 52 by a connecting member 53, and an end inside the switch case 11 is connected to the movable portion 23 of the switch 20 through the through hole 23b. While inserting in a freely rotatable state,
The retaining rings 54, 54 enable the integral movement in the axial direction. Reference numeral 55 denotes a transmission rod which is inserted into the pivot portion so as to freely advance and retreat in the axial direction in a double-cylinder state with the transmission cylinder 51. The end of the cam case 25 faces the detaching portion 47a, and the switch case.
The end portion on the 11th side is provided with an operating portion 56 for disengagement, which is formed by a part thereof, in a state of protruding to the outside from the through hole 15.

Next, reference numeral 58 represents a releasing device, and a solenoid is used as an example. Reference numeral 59 is a main body provided with a coil, 60 is a movable iron core, and reciprocates between the retracted position shown in FIG. 2A when the coil is not energized and the forward position shown in FIG. 3B when the coil is energized. It is freely movable, and the driving pin 61, which is integrally connected, faces the operating pin 56 for operating the operating part 56. Reference numeral 62 is an iron core cover, and 63 is a mounting screw.

The safety device 5 is shipped with the cam case 25 fixed to the switch case 11 in the direction shown in FIG. 2A, for example. The safety device 5 is shown in FIG.
When used in a safety fence 2 equipped with a right-handed sliding door type door 4 such as the one shown in FIG.
As shown in (A) of FIG. The operation key 7 is attached to the door 4 at a position where it can enter the through hole 32. In the safety fence 2 to which the safety device 5 is attached, when the door 4 is closed, the operation key 7 is moved from the state shown in FIG. 2A to the cam case through the through hole 32 as shown in FIG. 3A.
25, and its tip 7a enters the recess 40, and then the receiving portion 41
, And pushes it to rotate the cam 38 forward in the direction of the arrow. As a result, the locking portion 42 is located on the rear side of the engaging portion 7b.
When the engaging claw 43 engages with the locking body 46 as shown in FIG. 3A, the locking body 46 prevents the cam 38 from returning and rotating. As a result, the operation key 7 cannot move backward, and the door 4 is locked. Further, when the operation is performed as described above, the pin 52 is formed by the elongated hole 44 as shown in FIG.
It is pushed downward from the state of (A) as shown in FIG. As a result, the switch is connected via the connecting member 53 and the transmission cylinder 51.
As the signal confirming that the movable part 23 of 20 is pushed down and the switch 20 is locked, the fixed contacts 22c, 22
A closing signal by the contact of the movable contact 24b with respect to c and an open signal by the separation of the movable contact 24a from the fixed contacts 22a, 22a are output.

Next, when it is desired to open the door 4 of the safety fence 2, when the coil is energized as a release command to the solenoid 58, the movable iron core 60 changes from the state shown in FIG.
As shown in (B), the drive pin 61 pushes the operating portion 56.
Then, the transmission rod 55 moves upward and pushes the detaching portion 47a. As a result, the locking body 46 is separated from the engaging claw 43 against the biasing force of the spring 49 as shown in FIG. When the locking body 46 is separated, the cam
Since 38 is free to rotate, the door 4 can be opened. When the door 4 is opened, the engaging key 7b of the operation key 7 pushes the locking part 42 to rotate the cam 38 in the clockwise direction in FIG. The cam 38 is in the returning state as shown in FIG. After that, when the energization of the solenoid 58 is cut off, the movable iron core 60 returns to the retracted position again, and the locking body 46 returns to the state shown in FIG. 2 (A). Further, the movable portion 23 of the switch 20 is also restored by the return rotation of the cam 38 via the connecting mechanism 50, and the open / closed state of the contacts 22a, 22c is as shown in FIG. 2 (A).

When the safety device 5 is used in the safety fence 2 having the hinged door 64 as shown in FIG. 1 (B), the screw rod 31 is loosened and pulled into the through hole 30 from the screw hole 14. Next, set the cam case 25 to the switch case 11 by 90
Turn so that the through hole 32 is on the same side as the lid 17. In this state, all the through holes 30 overlap with the adjacent screw holes 14 which are 90 ° apart from the previously installed state. Next, screw the screw rod 31 into the screw hole 14 that is now in the new facing state, and switch the switch case.
Fix the cam case 25 to 11. The safety device 5 in this state is attached to the safety fence 2 as shown in the figure. When the cam case 25 is rotated as described above, the transmission cylinder 51 also rotates.
Since the switch 51 is rotatable relative to the movable part 23 of the switch 20, it does not hinder the connection with the movable part 23.
On the other hand, as the operation key 7, one having a shape as shown in the drawing which can enter the through hole 32 located on the front side is prepared, and is used by being attached to the free end portion of the hinged door 64.

When the safety device 5 is used in a safety fence having a left-hand sliding door, the cam case 25 is removed from the switch case 11 by removing the screw rod 31 from the screw hole 14.
Turn 0 ° so that the through hole 32 is on the left side in FIG. 2 (A), and in that state, use the screw rod 31 to move the cam case.
25 is fixed to switch case 11 and used.

Next, FIG. 6 shows a different embodiment of the present invention, in which the lock can be released not only by energizing the solenoid but also by operating a release key held by a hand. In the figure, 71 is a solenoid body 59e
A release cam case mounted on the casing 71, and 72 is a release cam rotatably mounted on the case 71, and has a key hole 73 for inserting a release key in the shaft center portion. With this configuration, the operator inserts the release key he has in his hand into the key hole 73 to release the release cam 72.
When is rotated in the direction of the arrow from the state of (A), the pushing surface 72a pushes the bottom surface 74 of the movable iron core 60e to move the movable iron core 60e upward, and the pin 61e pushes the operating portion 56e to the state of (B) to lock. Is canceled. The case 71 may be directly connected to the case 11e without using the solenoid 58e, and the operation portion 56e may be directly operated by the cam 72. 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. (Also, in the following figure, the same letter is added to the letter "f" to omit the duplicated explanation.)

Next, FIG. 7 shows a further different example of the present application.
23 shows an example in which the transmission cylinder 51f is used for connection with the locking member 46f and the releasing operation portion 56f.
In such a structure, even if the cam case 25f is rotated with respect to the switch case 11f to rotate the transmission rod 55f, the disc-shaped transmission piece 75 attached to the transmission rod 55f is used as a switch.
In order to always face the movable portion 23f of the 20f, the movement of the former is transmitted to the latter, and the movement of the operating portion 56f for releasing is transmitted by the transmission piece 76 and the transmission cylinder 51f so as to always face the transmission piece 76. A flange-shaped transmission body 77 attached to the lower end, a transmission cylinder 51f, and a detached portion 47af
Is transmitted to the detaching portion 47af in order through the brim-shaped transmission member 78 attached to the upper end of the transmission cylinder 51f so as to always face each other.

[0020]

As described above, according to the present invention, when the door 4 of the safety fence 2 is closed, the cam 38 is rotated by the operation key 7 that has entered through the through hole 32 of the cam case 25, and the operation key 7 is engaged. Since the locking portion 42 of the cam 38 is located on the rear side of the mating portion 7b and the locking body 46 is engaged with the engagement claw 43 to prevent the cam 38 from returning, the operation key 7 It has a feature that the return is blocked by the locking portion 42 and the closed state of the door 4 can be locked.

Further, in the above case, the rotating cam 38 actuates the transmission cylinder 51 (or the transmission rod 55) via the driving long hole 44 and the driven member 52, and the transmission cylinder 51 (or the transmission rod 55).
Since the switch 20 can be operated by this switch, there is an effect that another interlocking operation command, for example, an operation start command for the machine 1 inside the safety fence 2 can be issued from the switch in conjunction with the lock.

On the other hand, when the operator wants to open the door 4, when the operator artificially operates the operation portion 56, the transmission rod 55 (or the transmission cylinder).
51) is operated, the locking rod 46 is disengaged from the engaging claw 43 by the transmission rod 55 (or the transmission cylinder 51), and the return blocking state of the cam 38 is released, which locks the operator. There is a safety that can open the door after giving a sense of release.

Moreover, even in the case where the transmission of the two operations is performed by the transmission cylinder 51 and the transmission rod 55 as described above, they are formed in a double cylinder shape and arranged coaxially with the rotation axis of the cam case 25 with respect to the switch case 11. With this structure, the cam case 25 can be rotated with respect to the switch case 11 while the transmission of the above-mentioned two operations is enabled, and the through hole 32 for entering the operation key can be directed to any side. This is shown in FIG.
1 for a right-handed sliding door 4 such as, or a left-handed sliding door opposite to that, or a swinging door 64 such as (B)
It is adaptable to handle any of these with any type of safety device.

[Brief description of drawings]

1A and 1B are perspective views showing a usage state of a safety device.

2A is a vertical cross-sectional view of a safety device and operation keys, FIG.
(B) is the II-II sectional view taken on the line in (A).

FIG. 3A is a schematic vertical sectional view showing a locked state,
(B) is a schematic vertical cross-sectional view showing an unlocked state.

FIG. 4 is an exploded perspective view showing a relationship between a switch case and a cam case.

FIG. 5 is an exploded perspective view showing a mechanism with a built-in cam case.

FIG. 6 is a partial view showing a different embodiment, in which (A) shows a non-released state and (B) shows a released state.

FIG. 7 is a diagram schematically showing still another embodiment.

[Explanation of symbols]

 2 Safety fence 4 Door 5 Safety device 7 Operation key 11 Switch case 20 Switch 25 Cam case 32 Through hole 38 Cam 51 Transmission cylinder 55 Transmission rod

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[Procedure amendment]

[Submission date] October 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

1A and 1B are perspective views showing a usage state of a safety device.

2A is a vertical cross-sectional view of a safety device and operation keys, FIG.
(B) is a sectional view taken along line II-II in (A), and (C) is a partially cutaway exploded perspective view of the switch.

FIG. 3A is a schematic vertical sectional view showing a locked state,
(B) is a schematic vertical cross-sectional view showing an unlocked state.

FIG. 4 is an exploded perspective view showing a relationship between a switch case and a cam case.

FIG. 5 is an exploded perspective view showing a mechanism with a built-in cam case.

FIG. 6 is a partial view showing a different embodiment, in which (A) shows a non-released state and (B) shows a released state.

FIG. 7 is a diagram schematically showing still another embodiment.

[Explanation of symbols] 2 Safety fence 4 Door 5 Safety device 7 Operation key 11 Switch case 20 Switch 25 Cam case 32 Through hole 38 Cam 51 Transmission cylinder 55 Transmission rod

Claims (1)

[Claims] 1. A switch case for mounting near the periphery of an entrance / exit in a safety fence, and an operation key pivotally attached to one end of the switch case and provided on a side surface of the door for closing the entrance / exit. And a cam case having a through hole for holding the switch, the switch case is provided with a switch, the cam case is provided with a cam for reciprocating rotation, and the outer periphery of the cam is A receiving portion for abutting the tip of the operation key that has entered through the through hole, and a locking portion for positioning the operation key on the rear side of the engaging portion by the rotation of the cam by the abutment,
An engaging claw for locking the forward movement state of the cam is provided, and a switch drive for changing the distance from the center of rotation of the cam in the direction of rotation of the cam is provided at an intermediate portion in the radial direction of the cam. And a locking body for preventing the cam from returning due to the engagement with the engaging claw of the forward cam in the cam case.
In the pivotal connection portion of the cam case with respect to the switch case, a double rod-shaped transmission rod and a transmission cylinder are passed through coaxially with the rotation axis of the cam case, and the driven member positioned in the elongated hole is The movable portion of the switch is connected to the end of the transmission cylinder or the transmission rod inside the switch case, while the movable portion of the switch is connected to the end of the transmission cylinder or the transmission rod inside the switch case. The disengagement portion provided for disengagement faces the end of the transmission rod or the transmission cylinder inside the cam case, while the operation portion for releasing the engagement of the locking body is provided on the transmission rod or the transmission cylinder. A safety device characterized by being provided at the end on the switch case side.