JP2018048529A5 - - Google Patents

Description

Safety fence and lockout device

  The present invention relates to a safety fence in which equipment is installed on the inner side and doors for entering and exiting the inner side and the outer side are provided. The present invention also relates to a lockout device used for the safety fence.

  For example, Patent Document 1 describes that when an industrial device, an industrial robot, or the like in a work area is stopped, the switch body of a safety door switch is made inoperable.

  The door switch is a combination of a switch body and a metal fitting fixedly attached to a fixed frame attached to an entrance of the work area, and a slide key attached to a door hinged to the fixed frame so as to be slidable laterally. It is configured.

  And after pulling out the operation key of the slide key from the switch body and the metal fitting, the tag piece attached to the metal fitting is swung down and turned into a lockout posture to cover the front surface of the metal fitting, The operation key cannot be inserted into the switch body. In this state, the hole of the tag piece communicates with the hole of the receiving metal fitting. Therefore, if the padlocks are hooked on both the holes, the tag piece cannot be swung up and opened.

  Patent Document 2 describes a lock prohibiting method of a safety switch for turning on and off the machine on a hinged door at the entrance of the fence in a fence surrounding a drive range of the machine such as a work robot. Yes.

  The safety switch includes a key unit and a switch body. The key unit is provided on the door, and the key unit is provided with a key so as to be slidable. A resonant circuit composed of a coil and a capacitor is embedded inside the key.

  The switch body is provided on a door frame to which the door is attached, and the switch body is provided with a key hole into which the key is inserted and removed. The switch body has means for determining that the key has been inserted into the keyhole.

  This means includes a coil for generating a magnetic field, a transmission / reception circuit, and a signal processing circuit. Then, by causing an alternating current to flow through the coil by the transmission / reception circuit to generate a magnetic field, a resonance circuit including a coil and a capacitor provided in the key is resonated, and the signal processing circuit has the resonance frequency and a predetermined frequency. Is determined to match, it is determined that the key has been inserted into the keyhole.

  Then, a lockout tag (lock prohibition tool) and a padlock are used so that the key cannot be inserted when the key is extracted from the keyhole. The lockout tag is formed in substantially the same shape as the key, and a long hole is provided at the tip side of the lockout tag to hook the padlock.

  As a lockout procedure, after the key is removed from the keyhole and the door is opened, the lockout tag is inserted into the keyhole, and the padlock is hooked into the long hole of the lockout tag to lock. As a result, the key cannot be inserted into the keyhole, so that the safety switch cannot be turned on.

  It should be noted that all the padlocks possessed by each of a plurality of workers can be hooked in the long holes of the lockout tag.

Japanese Patent No. 4351608 JP 2008-186757 A

  In Patent Document 1, when a plurality of workers have the padlock key and one of the workers unlocks the padlock, the worker remains in the work area. But the door can be closed and locked. Therefore, it can be said that the safety of workers remaining in the work area is lowered.

  On the other hand, in Patent Document 2, when a plurality of workers have a padlock key, the lockout tag cannot be removed unless all workers remove the corresponding padlock. If even one worker remains in the area, the door cannot be closed and locked. For this reason, it can be said that the safety of the worker is improved, such as the door cannot be locked while leaving the worker in the work area.

  However, in Patent Document 2, since the lockout tag is only attached to the door frame via a chain, the lockout tag cannot be locked out if it is lost by any chance. . There is room for improvement here.

  In view of such circumstances, the present invention provides a safety fence in which equipment is installed on the inner side and doors for entering and exiting the inner side and the outer side are provided. The purpose is to increase the reliability of lockout while preventing loss. Another object of the present invention is to improve the reliability of the lockout in the lockout device used for the safety fence while preventing loss of members related to the lockout accompanying the opening of the door.

  The present invention is a safety fence in which equipment is installed on the inner side and doors for entering and exiting the inner side and the outer side are provided, and a locking part provided on the door or the door frame for attaching the door, A locked portion provided on the door frame or the door and the locking portion being overlapped in the front-rear direction when the door is closed, and mounted across the locking portion and the locked portion, A first lock for removing the door so that the door can be opened and unlocking the door, and a power supply line provided on the door frame and to the equipment. A switching member interposed so as to cut off or connect the power supply line, an operation member for connecting the power supply line by being detachably attached to the switching member, and the switching member from the switching member. Operation member is removed A lockout device for disabling the operation member from being mounted on the switching member, and the lockout device is installed on a side of the switching member in the door frame and the first A guide rail with a storage portion for storing a lock release key, and a guide rail which is slidably engaged with the guide rail and is not slidable by the operation member when the operation member is mounted on the switching member. The release key is constrained to the first position where the release key is obscured, and when the operation member is removed from the switching member, the release member is covered and the release key can be removed. A slider that is slidable at a second position, and the guide rail and the slider are fixed to the slider only at the second position. Hole hooked matches to allow hooking the second lock because are respectively provided, it is characterized in that.

  The door may be of a type that rotates using a hinge or a type that slides linearly.

  In this configuration, in order to open the door, first, an operator removes the operation member from the switching member to cut off the power supply line to make it impossible to supply power to the equipment. There is a need.

  Then, in order to open the door while maintaining the state where the operation member is removed from the switching member, the slider is slid to the second position, and the release key of the first lock is taken out. The first lock is removed by unlocking it. This makes it possible to open the door.

  As described above, when the slider is slid to the second position, that is, when the switching member is covered with the slider, the hook holes of the slider and the guide rail are matched.

  Therefore, when the second lock (or the removed first lock) is hooked and locked in each of the hook holes, a lockout state is established.

  In other words, in the lockout state as described above, the slider cannot be physically returned to the first position, so that a third party (an operator other than the operator who entered the safety fence) Even if the operation member is the same as the operation member and possesses another operation member, the operation member cannot be physically attached to the switching member.

  Accordingly, it is possible to reliably avoid the occurrence of an unexpected situation in which the equipment is operated by the third party.

  Therefore, when an operator enters the inside of the safety fence after opening the door and entering the lockout state, by locking the second lock, the equipment can be made inoperable. As a result, there is no possibility that an operator entering the inside of the safety fence will be injured by the equipment.

  In addition, in the configuration of the present invention, since the slider for covering the switching member is fixed to the door frame via the guide rail, there is no fear of losing the slider. Therefore, the lockout state can be reliably established in any situation.

  By the way, the said safety fence can be set as the structure further equipped with the urging member for always urging | biasing the said slider toward the said 2nd position.

  In this configuration, when the operation member is removed from the switching member, the slider is slid to the second position by the urging force of the urging member.

  Thus, when the operation member is removed, the switching member is automatically covered by the slider, and the release key of the first lock is exposed. Therefore, it is possible to reduce the work for establishing the lockout and contribute to simplification, and the storage location of the release key of the first lock can be easily recognized.

  The safety fence further includes a storage shelf for storing the second lock, and the front lock of the storage shelf has the first lock from the locking portion and the locked portion. A cover is provided that allows the front opening to be opened in the removed state, while the front opening cannot be opened in the locked state with the first lock attached to the locking portion and the locked portion. Can be configured.

  In this configuration, it is not necessary for an operator entering the inside of the safety fence to carry the second lock, and it is possible to prevent a third party from taking out the second lock.

  The door frame may be provided with an inner locking device for locking from the inside while the door is closed.

  In this configuration, since an operator entering the inside of the safety fence can lock the door from the inside, the door can be locked by a third party (other than the worker entering the inside of the safety fence. Workers) cannot be opened from the outside. Thereby, it becomes advantageous when ensuring the safety of the worker who entered the inside of the safety fence.

  Thereby, even if the third party possesses another operation member that is the same as the operation member, the third party can recognize that the act of mounting the operation member on the switching member is not allowed.

  The peripheral wall of the safety fence may be provided with a notification device for notifying the state when the operation member is removed from the switching member.

  In this configuration, it becomes easy for an operator around the safety fence to recognize whether or not the operation member is detached from the switching member by the notification device.

  The power supply line is a power supply line, the switching member is a socket interposed in the power supply line so as to cut off the power supply line, and the operation member is attached to the socket. The power plug can be a safety plug that connects the power supply lines.

  Further, the present invention is a lockout device used for the safety fence, comprising a guide rail and a slider, and the guide rail is installed on a side of the switching member in the door frame and the door A storage portion is provided for storing a release key for a first lock for making the door unlockable while the door cannot be opened, and the slider is attached to the guide rail. While slidably engaged and when the operating member is mounted on the switching member, the operating member is made non-slidable by the operating member and is restrained to a first position where the release key is uncovered. When the operation member is removed from the switching member, the switching member is obscured and slidable to a second position where the release key is removably exposed. The guide rail and the slider are each provided with a hooking hole that matches the second lock or hasp for making the slider immovable only at the second position. It is characterized by that.

  The lockout device may further include a biasing member for constantly biasing the slider toward the second position.

  The present invention relates to a safety fence in which equipment is installed on the inner side and doors for entering and exiting the inner side and the outer side are provided, and a lockout device used for the safety fence. It becomes possible to increase the reliability of the lockout while preventing loss of the member to be performed.

It is a front view which shows the lockout system of a door in the safety fence of FIG. 1 is a perspective view schematically showing an overall appearance of an embodiment of a safety fence according to the present invention. FIG. It is the figure which looked at the locking device of Drawing 1 from the top. It is the figure which looked at the lockout device of Drawing 1 from the top. It is a figure which shows the state which removed the safety plug in FIG. It is the figure which looked at the lockout device of Drawing 5 from the top. It is a figure which shows the state which unlocked the locking device in FIG. 5, and removed the 1st lock | rock. It is the figure which looked at the locking device of Drawing 7 from the top. It is a figure which shows the state which opened the cover in FIG. 7, and took out the 2nd lock | rock and the hasp. FIG. 10 is a diagram showing a state where the hasp is hooked on the slider and locked in FIG. 9. It is a figure which shows the state which hooked and locked the 2nd lock | rock on the hasp in FIG.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  1 to 11 show an embodiment of the present invention. In the figure, 1 is a safety fence, 2 is a door, and 3 is a door frame.

  The safety fence 1 surrounds the drive range of the equipment 4 such as a work robot. The door 2 is of a type that rotates via a hinge 2a, and is, for example, an open door. However, the door 2 may be an inward opening.

  The safety fence 1 is provided with a locking device 5, a first lock 6, a safety switch 7, a lockout device 8, a storage shelf 9, and the like.

  The locking device 5 makes the door 2 openable or non-openable, and includes a slide key 51 as a locking portion and a key receiver 52 as a locked portion.

  The slide key 51 is formed in a strip shape and is provided on the door 2 side. The key receiver 52 is made of a rod-like member bent in a U shape, and is provided on the door frame 3 side. The slide key 51 is slid laterally between the unlock position on the door 2 side and the lock position on the door frame 3 side.

  When the slide key 51 is slid to the lock position where the key receiver 52 is overlapped in the front-rear direction, the hook hole 51a on the tip side of the slide key 51 communicates with the inner space formed by the key receiver 52 in the front-rear direction. The first lock 6 can be hooked between the slide key 51 and the key receiver 52 to be locked.

  On the other hand, if the slide key 51 is slid to the unlock position where it is separated from the key receiver 52, the first lock 6 cannot be hooked between the slide key 51 and the key receiver 52.

  The first lock 6 is used to make the slide key 51 slidable to the unlock position while immovably restraining the slide key 51 of the locking device 5 at the lock position where the slide key 51 is slid to the key receiver 52 side. Thus, it is unlocked only by the dedicated release key 61.

  When the hook hole 51a of the slide key 51 communicates with the internal space of the key receiver 52, the first lock 6 is hooked and locked over the first lock 6.

  The safety switch 7 is for cutting off or connecting a power supply line (not shown) to the equipment 4 and includes a socket 71 as a switching member and a safety plug 72 as an operation member.

  The socket 71 is provided on the door frame 3 and is interposed in the power supply line so as to cut off the power supply line.

  The safety plug 72 connects the power supply line by being detachably attached to the socket 71, and a knob 72a is provided to facilitate the removal operation.

  When the safety plug 72 is removed from the socket 71, the safety switch 7 is turned off. When the safety plug 72 is attached to the socket 71, the safety switch 7 is turned on. The safety plug 72 may be individually carried by all workers who can enter the safety fence 1.

  The lockout device 8 is for preventing the power supply to the equipment 4 when the door 2 is opened so that the safety switch 7 is not turned on when the door 2 is opened. 81, a slider 82, and the like.

  The guide rail 81 is installed on the side of the socket 71 in the door frame 3 and is provided with a storage portion 81a in which the release key 61 of the first lock 6 is stored. The first lock 6 is a padlock.

  The slider 82 is slidably engaged with the guide rail 81. When the safety plug 72 is attached to the socket 71, the slider 82 is in a first position where the safety plug 72 serves as a stopper so that it cannot slide and covers the release key 61 so that it cannot be removed (see FIG. 1 and FIG. 1). 4), the second position exposes the release key 61 so as to cover the socket 71 and expose the release key 61 when the safety plug 72 is removed from the socket 71 (see FIGS. 5 and 6). It is possible to slide.

  The slider 82 is always urged toward the second position by a coil spring 83 as an urging member.

  The coil spring 83 is provided between the guide rail 81 and the slider 82 so as to always urge the slider 82 toward the second position. Specifically, the coil spring 83 is supported at one end by the guide rail 81 and at the other end by the slider 82, and is in an extended state when the slider 82 is slid to the first position. In the state, the slider 82 is urged toward the second position by the elastic restoring force to be compressed.

  The guide rail 81 and the slider 82 are provided with hook holes 81b and 82a, respectively. The hook holes 81b and 82a are matched only at the second position, and the second lock 11 or the hasp 12 is hooked across the two hook holes 81b and 82a that match. Yes.

  When the second lock 11 or the hasp 12 is hooked in the two hook holes 81b and 82a that match, the slider 82 is restrained so as not to move in the second position. Instead of the second lock 11, the first lock 6 removed from the locking device 5 can be used.

  The second lock 11 is a padlock. The hasp 12 is an auxiliary member of the second lock 11 and is provided with a plurality of hook holes 12a through which the plurality of second locks 11 can be hooked. It is possible to lock it by hooking it to.

  This hasp 12 is configured so that its own unlocking / locking operation can be performed only when no second lock 11 is hooked and locked in the plurality of hooking holes 12a. When even one of the two locks 11 is hooked and locked in the hooking hole 12a, the unlocking / locking operation cannot be performed.

  That is, when there are a plurality of workers, each of the workers uses the second lock 11 having a different release key 11a and decides to hook the plurality of second locks 11 on the storage shelf 9 described below. Keep it. And when working in the safety fence 1, each worker removes the second lock 11 from the storage shelf 9, and then each worker matches the second lock 11. Each worker holds the release key 11a of each second lock 11 and enters the inside of the safety fence 1 by being locked in the hook hole 12a of the hasp 12 that is locked by hooking into the two hook holes 81b and 82a. Decide as follows. Thus, after the work is completed, the hasp 12 cannot be removed until the last worker unlocks and removes the last second lock 11 from the hasp 12, so that the electric power is cut off during the work. The state can be reliably maintained.

  The storage shelf 9 is for storing the second lock 11 and the hasp 12, and is installed on the side of the locking device 5 in the door frame 3.

  The storage shelf 9 is provided with pins 9a for hooking the second lock 11 and the hasp 12 so as to hang them. A transparent cover 10 for opening and closing the front opening is rotatably attached to the front opening of the storage shelf 9 via a hinge 9b.

  A key receiver 52 of the locking device 5 is attached to one side wall portion of the cover 10. Therefore, when the slide key 51 is slid to the unlock position and pulled away from the key receiver 52, the cover 10 can be opened, that is, the front opening of the storage shelf 9 can be opened. On the other hand, when the slide key 51 is slid to the lock position where the slide key 51 is superimposed on the key receiver 52, the cover 10 cannot be opened, that is, the front opening of the storage shelf 9 cannot be opened.

  Next, a procedure for opening the door 2 of the safety fence 1 will be described.

  First, an operator who intends to enter the safety fence 1 cannot supply power to the equipment 4 by cutting off the power supply line by removing the safety plug 72 from the socket 71 in the state shown in FIGS. To make sure

  As a result, the slider 82 that receives the elastic restoring force to be compressed by the extending coil spring 83 is slid from the first position shown in FIGS. 1 and 4 to the second position shown in FIGS. 5 and 6. Thus, the socket 71 is covered and the release key 61 dedicated to the first lock 6 is exposed from the storage portion 81 a of the guide rail 81.

  In this state, the release key 61 is removed from the storage portion 81a of the guide rail 81, and is removed by unlocking the first lock 6 with the release key 61 as shown in FIGS. 51 is slid to the unlock position where it is pulled away from the key receiver 52.

  As a result, the door 2 can be opened, and the cover 10 can be opened to expose the storage shelf 9.

  Thereafter, as shown in FIGS. 8 and 9, the second lock 11 and the hasp 12 hooked on the storage shelf 9 are taken out by opening the cover 10, and then the removed first lock 6 is stored in the storage shelf. 9 is hooked on the pin 9a.

  Subsequently, as shown in FIG. 10, the picked-up hasp 12 is hooked and locked across the hooking hole 82a of the slider 82 and the hooking hole 81b of the guide rail 81 that matches it, and further shown in FIG. As described above, the second lock 11 taken out is hooked into the hook hole 12a of the hasp 12 and locked.

  Thereby, it will be in a lockout state. The removed safety plug 72 may be hooked on the storage shelf 9 or may be carried by the operator who has removed the safety plug 72.

  In this lockout state, since the socket 71 is covered with the slider 82 and is constrained in that state, even if the operator enters the inside of the safety fence 1, Even if a person (an operator other than the worker entering the inside of the safety fence 1) has the same safety plug 72 as another safety plug, the safety plug can be physically attached to the socket 71. Disappear.

  For this reason, the lockout state can be reliably maintained, so that it is possible to reliably avoid the occurrence of an unexpected situation in which the equipment device 4 is operated by the third party.

  If there is only one worker, the second lock 11 may be hooked and locked across the hook hole 82a of the slider 82 and the hook hole 81b of the guide rail 81 without using the hasp 12. Good.

  When there are a plurality of workers, the number of second locks 11 corresponding to the number of workers is previously hung on the storage shelf 9, and the hasp 12 is hooked with the hook hole 82a of the slider 82 and the guide rail in the same manner as described above. Each worker who enters the inside of the safety fence 1 removes the second lock 11 from the storage shelf 9 and hooks it into the hook hole 12a of the hasp 12 to lock it. Just decide to do it.

  Then, the procedure when the worker who has entered the inside of the safety fence 1 goes out of the safety fence 1 is the reverse procedure to the above, but will be described below.

  First, when the worker exits the safety fence 1, first, the second lock 11 is unlocked with the dedicated release key 11a and removed from the hasp 12, and the hasp 12 is removed from the hook hole 82a of the slider 82 and the guide rail. 81 is removed from the hooking hole 81b.

  The second lock 11 and the hasp 12 thus removed are hooked on the pins 9a of the storage shelf 9, the first lock 6 stored in the storage shelf 9 is taken out, and the cover 10 is closed to close the storage shelf. The front opening of 9 is closed.

  Thereafter, after the door 2 is closed, the slide key 51 is slid to the lock position and overlapped with the key receiver 52 to close the door 2, and then the hook hole 51 a of the slide key 51 and the key receiver 52 are closed. The first lock 6 is hooked and locked with the internal space, and the dedicated release key 61 is removed from the first lock 6.

  Subsequently, after the released release key 61 is stored in the storage portion 81a of the guide rail 81, the slider 82 is slid from the second position shown in FIGS. 5 and 6 to the first position shown in FIGS. As a result, the coil spring 83 is extended to cover the release key 61 stored in the storage portion 81a so that it cannot be removed, and the socket 71 is exposed.

  The safety plug 72 is attached to the exposed socket 71. This completes the release of the lockout state.

  As described above, according to the embodiment to which the present invention is applied, when the operator enters the safety fence 1 after opening the door 2 to be in the lockout state, the equipment 4 becomes inoperable. As a result, there is no possibility that the worker will be injured by the equipment 4 by any chance, and the safety of the worker can be surely ensured.

  In addition, in this embodiment, since the slider 82 for covering the socket 71 is fixed to the door frame 3 via the guide rail 81, there is no fear that the slider 82 is taken away or lost. Therefore, the lockout state can be reliably established in any situation.

  In addition, this invention is not limited only to the said embodiment, It can change suitably in the range equivalent to the claim and the said range.

  (1) In the said embodiment, although the case where it is set as the type rotated about the door 2 via the hinge 2a is mentioned as an example, this invention is not limited only to this and is not illustrated, It is also possible to use a door that slides linearly in the lateral direction.

  (2) In the above embodiment, an example is given in which the operating power of the facility device 4 is electric power, and the safety switch 7 is a combination of the socket 71 and the safety plug 72, but the present invention is limited to this. is not.

  Although not shown, for example, when the operating power of the equipment 4 is set to fluid pressure (pneumatic pressure, hydraulic pressure), a fluid pressure supply line is used instead of the power supply line, and a flow control is used instead of the socket 71. By using a switching member such as a valve, an operation member such as an operation lever for opening and closing the valve can be used instead of the safety plug 72.

  (3) Although not shown in the above embodiment, the door frame 3 can be provided with an inner locking device for locking from the inside while the door 2 is closed.

  In this case, since it becomes possible for the worker who entered the inside of the safety fence 1 to lock the door 2 from the inside, the door 2 can be locked by a third party (other than the worker who entered the inside of the safety fence 1. (Operator) cannot be opened from the outside. Thereby, it becomes advantageous when ensuring the safety of the worker who entered the inside of the safety fence 1.

  (4) In the above embodiment, although not shown, when the safety plug 72 is removed from the socket 71 on the peripheral wall of the safety fence 1, a notification device (indicator lamp, buzzer, etc.) for notifying the state is shown. Can be provided.

  (5) Although not shown, the locking device 5 shown in the above embodiment may be of a type that can lock the slide key 51 to the key receiver 52 so that the door 2 cannot be opened. Is possible.

  (6) In the above embodiment, a type in which the cover 10 is rotated sideways is taken as an example. However, the present invention is not limited to this, and although not illustrated, the cover 10 is rotated or slid upward. It is also possible to make a cover that opens.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a safety fence in which equipment is installed on the inner side and doors for entering and exiting the inner side and the outer side are provided, and a lockout device used for the safety fence.

1 Safety fence
2 doors
3 Door frame
4 Equipment
5 Locking device
51 Slide key (equivalent to the locking part)
52 Key holder (equivalent to locked part)
6 First lock
61 Release key
7 Safety switch
71 Socket (equivalent to switching member)
72 Safety plug (equivalent to operation member)
8 Lockout device
81 Guide rail
81a storage
81b hook hole
82 Slider
82a Hook hole 11 Second lock 12 Hasp

Claims (8)

A safety fence in which equipment is installed on the inside and doors for entering and exiting the inside and outside are provided,
A locking portion provided on the door or the door frame for attaching the door;
A locked portion provided in the door frame or the door and the locking portion being overlapped in the front-rear direction when the door is closed;
A first portion for attaching to the locking portion and the locked portion to bring the door into a locked state in which the door cannot be opened, and for removing the door to open the door in an unlocked state. With a lock,
A switching member provided in the door frame and interposed so as to cut off or connect the power supply line to the power supply line to the facility equipment;
An operation member for connecting the power supply line by being detachably attached to the switching member;
A lockout device for making the operation member unmountable on the switching member when the operation member is removed from the switching member;
The lockout device is installed on a side of the switching member in the door frame and has a guide rail with a storage portion in which the release key of the first lock is stored;
When the switch member is slidably engaged with the guide rail and the operation member is mounted on the switching member, the guide member is restrained to a first position where it is made non-slidable by the operation member and covers the release key. On the other hand, the slider comprises a slider that is slidable to a second position that covers the switch member when the operation member is removed from the switch member and exposes the release key so that the release key can be removed.
The guide rail and the slider are each provided with a hooking hole that matches the second lock for making the slider immovable only at the second position. Safety fence to do. In the safety fence of Claim 1,
A safety fence, further comprising a biasing member for constantly biasing the slider toward the second position. In the safety fence according to claim 1 or 2,
A storage shelf for storing the second lock;
In the front opening of the storage shelf, the front opening can be opened in a state where the first lock is removed from the locking portion and the locked portion, while the locking portion and the locked portion A safety fence is provided, wherein a cover is provided to make the front opening impossible to open in a state where the first lock is attached to the part and locked. In the safety fence of any one of Claim 1 to 3,
The door fence is provided with an inner locking device for locking from the inside while the door is closed. The safety fence according to any one of claims 1 to 4,
The safety fence according to claim 1, wherein a notification device is provided on the peripheral wall for notifying the state when the operation member is detached from the switching member. In the safety fence of any one of Claim 1 to 5,
The power supply line is a power supply line,
The switching member is a socket interposed in the power supply line so as to cut off the power supply line;
The safety fence according to claim 1, wherein the operating member is a safety plug that connects the power supply line by being mounted on the socket. Equipment equipment is installed on the inside, doors for access to the inside and outside are provided, and the door frame for mounting the door is provided to shut off or connect the power supply line to the power supply line to the equipment A lockout device used for a safety fence provided with a switching member interposed so as to be connected and an operation member for connecting the power supply line by being detachably attached to the switching member,
A guide rail and a slider,
The guide rail is installed on a side of the switching member in the door frame and is a first lock for bringing the door into an unlocked state while allowing the door to be unlocked. A storage part is provided to store the release key,
The slider is slidably engaged with the guide rail, and when the operation member is mounted on the switching member, the slider is made non-slidable by the operation member and covers the release key so as not to be taken out. While being restrained to one position, when the operation member is removed from the switching member, the switching member is covered and slidable to a second position where the release key is removably exposed. ,
The guide rail and the slider are each provided with a hooking hole that matches the second lock or the hasp for making the slider immovable only at the second position. Feature lockout device. The lockout device according to claim 7,
A lockout device, further comprising a biasing member for constantly biasing the slider toward the second position.