JP6978778B2 - Switchgear that uses a cutout - Google Patents

Description

The present invention relates to a switchgear for measuring work restrictions for the purpose of ensuring safety in a power transmission tower or the like equipped with a fall prevention device for raising and lowering.

In high-rise buildings including power transmission towers and antenna towers, safety equipment for aerial work required for maintenance etc. is installed. In particular, in elevating equipment such as steel towers, fixed rails are installed as safety equipment to prevent falls when ascending and descending, and a fall prevention device consisting of a combination of these rails and a dedicated cutout is generally used.

For example, a rail of a fall prevention device is laid near the lifting equipment such as steps, ladders, and step bolts, and a special fall prevention device safety device that can move along this rail is attached, and the worker's safety device is attached to this safety device. A fall prevention device is used that allows an operator to safely and easily move up and down along a rail by connecting a life rope.

Patent Document 1 describes the safety of a fall prevention device provided with a rail of a fall prevention device laid on a steel tower pillar or the like, a roller for running by fitting to this long rigid rail, and an emergency braking member. The vessel is listed. FIG. 2 is an explanatory view of a cross section of a rail for a fall prevention device. FIG. 3 is a side view of the cutout of the fall prevention device dedicated to this rail.

The rail 51 of the fall prevention device shown in FIG. 2 is a long hollow prismatic rigid rail 51 having an opening groove 52 provided in the center of the front surface (upper side of the figure) and running surfaces 53 formed on both sides thereof. Yes, the back side (lower side in the figure) is attached to the structure, and the front side is opened for running the cutout 61.

The cutout 61 of the fall prevention device shown in FIG. 3 is fitted with the main body base 62 of the cutout 61 and the roller 66 fitted in the prismatic internal space of the rigid rail 51, and travels along the rail 51. In the cutout 61, the roller 66 faces the traveling surface 53 and the guide roller 67 faces the opening groove 52 of the rail 51, so that the cutout 61 can smoothly travel along the rail 51.

Further, the cutout 61 forms a link mechanism with a fixed link composed of a guide portion 64 integrated with the main body base 62 and a movable link composed of a lever plate 63 and an connecting plate 65, and other than the main body base 62. , Arranged outside the rail 51. By this link mechanism, the lever plate 63 operates according to the movement of the connecting plate 65, so that the distance between the tip of the lever plate 63 and the roller 66 can be adjusted, and the tip of the lever plate 63 and the rail 51 by the roller 66 can be adjusted. The traveling surface 53 can be pinched and opened.

When ascending and descending, the operator connects each person's life rope to the body rope through hole 68 of the connecting plate 65 and uses the cutout 61. During normal ascent and descent, the distance between the tip of the lever plate 63 and the roller 66 is increased to open the traveling surface 53 of the rail 51, so that the cutout switch 61 also travels on the rail 51 according to the ascending and descending of the operator. ..

When the weight of the worker is applied to the articulated plate 65 of the cutout switch 61 in the ground direction (right direction in the figure) through the life rope, the distance between the tip of the lever plate 63 and the roller 66 is narrowed, and the traveling surface 53 of the rail 51 is narrowed. The cutout 61 receives braking and finally stops. Therefore, in an emergency such as a worker's crash, the cutout 61 stops on the rail 51 and the worker is held by the life rope, so that the crash can be prevented.

As the rail 51 of the fall prevention device, rails 51 having various cross-sectional shapes have been proposed, and for each of these rails 51 having various cross-sectional shapes, a cutout switch 61 of a dedicated fall prevention device has been proposed. The rail 51 and the cutout 61 of the example fall prevention device are one of the fall prevention devices currently widely used in transmission line towers and the like.

On the other hand, for safety measures, in order to prevent outsiders other than workers such as maintenance from ascending to the tower, etc., fences, etc. are installed around the tower, etc. to the tower of outsiders. Measures have been taken such as blocking the approach of the tower, blocking the use of lifting equipment by outsiders by locking the tower's lifting equipment, and preventing climbing by installing a tower climbing prevention device on the tower. ..

For example, Patent Document 2 describes an example of an elevating facility provided with a locking member. FIG. 4 shows an elevating ladder with a locking member. As shown in the figure, the elevating ladder 71 is provided with an elevating prevention portion 74 on the side close to the ground 79, and a locking member 78 is attached to the elevating ladder 71.

In this elevating prevention portion 74 , the fixed end portion 76a of the door member 76 is attached to one of the ladder columns 72 by a hinge portion 77, and when not used by a person concerned, the step 73 of the elevating ladder 71 is covered with the door member 76. In this way, the free end portion 76b of the door member 76 can be fixed to the other side of the ladder column 72 by the locking member 78. Further, although not shown, there is also a proposal for an elevating prevention unit 74 such that the auxiliary ladder is also folded (or pulled up) and stored in the door member 76.

Further, Patent Document 3 describes an example of the above-mentioned tower rise prevention device. FIG. 5 shows a tower rise prevention device attached to the tower. As shown in the figure , traffic is blocked by surrounding the main pillar 82 of the tower with a tower prevention device 81 composed of an inner frame 83, an outer frame 84, and an opening / closing frame 85 stretched with wire mesh 86 without gaps. It is not easy to climb to a steel tower.

The inner frame 83, the outer frame 84, and the opening / closing frame 85 stretched with the wire mesh 86 are attached to the main pillar 82 and the abdominal material (not shown) of the steel tower, respectively. The inner frame 83 and the outer frame 84 are fixed. The tower rise prevention device 81 has a mounting member 87 and a backing plate 88 connected to the inner frame 83 so that the opening is minimized so that not only humans but also snakes can be prevented from climbing.

In the elevating passage part of a steel tower or the like, it is common that elevating equipment such as step bolts and a rail 51 of a fall prevention device are laid along the elevating passage along the main pillar 82 as a safety measure when the worker goes up and down. Is. The tower rise prevention device 81 is required to prevent unnecessary ascent and descent without interfering with the use of the elevating equipment and the fall prevention device when elevating is required. In this tower rise prevention device 81 , the part of the opening / closing frame 85 attached to the elevating passage portion of the steel tower or the like is composed of two pieces, and each piece can be slid and deployed respectively, so that the elevating passage portion can be fully opened when elevating is necessary. It has a structure. Further, the opening / closing frame 85 has a structure that can be connected and locked by the gassho portion 89 when the elevating passage portion is closed.

When workers such as maintenance work on steel towers with these measures taken at high places, the workers receive a key loan from the manager of the tower, etc., and the fences and tower equipment that are locked are locked. , The tower prevention device can be unlocked and the tower can be safely ascended to the tower using the fall prevention device. In addition, if locked with such equipment, outsiders who cannot obtain the key cannot easily ascend the tower.

Japanese Unexamined Patent Publication No. 2012-245217 Japanese Unexamined Patent Publication No. 2002-242570 Japanese Unexamined Patent Publication No. 06-173500

At present, by taking these measures, outsiders are excluded and maintenance workers use a fall prevention device to ensure the safety of aerial work on the tower.

Further, in the fall prevention device shown in FIGS. 2 and 3, the rail 51 is permanently installed in a steel tower or the like, and the cutout 61 is also small and lightweight, so that it can be easily transported to the work site, and the cutout 61 at the work site. Is not so difficult to mount on the rail 51 and to use the fall prevention device when going up and down. Furthermore, this fall prevention device does not interfere with the ascending / descending operation of the steel tower, etc., but prevents the fall even if there is an operation error during ascending / descending, but rather assists the ascending / descending of the steel tower, etc. Widely used in.

However, any person involved in the work who can avoid the measures to prevent the tower from rising to the tower or the like as described above can ascend to the tower or the like without using such a fall prevention device. Of course, going up and down without using a fall prevention device is an act that ignores work safety, so it is prohibited by normal work standards.

It is natural for workers to adhere to work standards, but if, in addition to human safety rules, more compulsory measures are taken to prevent the tower from climbing without the use of fall prevention devices, It is thought that such unsafe behavior can be suppressed and work safety at heights can be ensured.

For example, a monitoring device should be attached to each tower, etc., and the central control should be used to supervise work such as maintenance and release the tower prevention device, so that the tower cannot be climbed without using the fall prevention device. Is also possible. However, there are innumerable power transmission towers alone, and in power transmission towers and the like that only rise during maintenance and do not require constant rise, such equipment becomes excessive, so simpler measures are desirable.

The present invention is a simple and compulsory measure to prevent the tower from ascending without using the fall prevention device. We propose a switchgear that uses the cutout of the prevention device as the key.

In the present invention, a case in which a snatch lock is housed in a case and a keyhole for inserting a part of a safety device of a fall prevention device is provided in one of the cases, and a trigger lever in the case in the direction of the keyhole. An opening / closing device having the snatch lock housed toward the target, a receiving metal fitting engaged with the lock portion of the snatch lock, and a mounting member for mounting on the rail of the fall prevention device. It is an opening / closing device characterized in that a wire rope attachment portion is provided or a lock key is fixed.

Further, in the present invention, the cutout mounted on the rail of the fall prevention device is moved along the rail and is in contact with the switchgear attached to the rail of the fall prevention device and fixed to the case. when obtained by a the switchgear, wherein a part of said safety device is fitted into the keyhole of the case.

Further, the present invention is the switchgear, characterized in that a keyhole that fits a part of the cutout is provided in the upper part of the keyhole of the case.

Further, the present invention is the switchgear, further comprising a lock mechanism for the trigger lever, which is released by fitting the cutout into the keyway.

Further, the present invention is the switchgear, further characterized in that the receiving metal fitting is provided with a locking member for fixing the case.

Since the cutout of the fall prevention device is the key to the switchgear of the present invention, it is difficult to ascend a tower such as a steel tower unless a cutout that matches each site is brought in. It is possible to suppress unsafe behavior such as towering.

Further, the switchgear of the present invention can unlock the switchgear by mounting the cutout of the fall prevention device on the rail and running the switchgear. Ascending without using this fall prevention device at the time of the tower is suppressed.

It is explanatory drawing which shows the state which the switchgear of this invention is attached to the rail of a fall prevention device. (A) is an explanatory view seen from the front side of the rail, and (b) is an explanatory view seen from the side surface of the rail. It is explanatory drawing which shows the cross section of the rail of the conventional fall prevention device. It is explanatory drawing which shows the side surface of the cutout of the conventional fall prevention device. It is explanatory drawing which shows the conventional ladder for raising and lowering with a locking member. It is explanatory drawing which shows the state which the conventional tower rise prevention device is attached to the steel tower. It is explanatory drawing which saw the state which the switchgear of this invention was attached to the rail of a fall prevention device from the extending direction of a rail. The rail shows a cross section. (A) shows a state in which the running surface of the rail is open, and (b) shows a state in which the running surface of the rail is attached. It is explanatory drawing which shows the state which made the cutout of the fall prevention device act on the switchgear of this invention. (A) is an explanatory view seen from the upper surface direction of the rail, and (b) is an explanatory view seen from the side surface of the rail. It is explanatory drawing which showed the cross section of the switchgear of this invention by enlarging the part of the lock mechanism of a trigger lever. (A) is a state in which the unlocking operation is not performed, (b) is a state in which the trigger lever is locked due to an illegal unlocking operation, and (c) is a state in the initial stage by a normal unlocking operation. d) is a state in which the unlocking operation is normally performed.

The present invention is a switchgear using a cutout of a fall prevention device as a key. FIG. 1 shows an example of the switchgear of the present invention. This switchgear 1 is basically used by being attached to a rail 51 of a fall prevention device laid on a steel tower or the like. In FIGS. 1, 7, and 8 in the present application, the right side is toward the ground. The cutout 61 in FIG. 3 is also used so that the right side faces the ground.

The rail 51 of the fall prevention device is not necessarily laid vertically in a straight line, and if necessary, a rail 51 that draws a curve may be laid with a horizontal portion. Since the cutout 61 of the fall prevention device operates by utilizing gravity, it has a directional property, and the mounting direction to the rail 51 is also determined. The switchgear 1 of the present invention may be mounted at an appropriate position on the rail 51 as needed, but the mounting direction is when the long rail 51 is viewed as a whole in accordance with the mounting direction of the cutout device 61. Install as shown in this figure, depending on the direction of the ground.

As shown in FIG. 1, in the opening / closing device 1 of the present invention, the snatch lock 4 is housed in the case 3, and the case 3 is attached to the traveling surface 53 of the rail 51. By storing the snatch lock 4 in the case 3, the opening / closing mechanism is not exposed, so that the lock is less likely to be broken and the durability is improved.

The ground side of the case 3 is opened as a keyhole 19 , and two key grooves 18 are provided on the upper surface (upper side in the figure) of the case 3 on the ground side. Further, the side of the case 3 opposite to the ground is also opened so that the receiving metal fitting 9 to which the wire rope 2 is attached can be easily attached to and removed from the snatch lock 4.

The trigger lever 6 of the snatch lock 4 is arranged on the ground side, and the lock portion 5 is arranged on the opposite side to the ground. When the tip of the bracket 9 is pushed into the lock portion 5 of the snatch lock 4, the bracket 9 is locked, and when the trigger lever 6 of the snatch lock 4 is pushed up, the bracket 9 is unlocked.

A receiving metal fitting auxiliary material 10 and a locking member 11 are attached to the receiving metal fitting 9. Here, as a wire rope mounting member, the receiving metal fitting auxiliary material 10 is provided with an opening, and the wire rope 2 is attached by forming a ring passing through the opening and being clipped. .. When the receiving metal fitting 9 is locked, the locking member 11 is arranged in the locking groove 12 of the case 3, and the switchgear 1 is placed on the traveling surface 53 of the rail 51 with the case 3 in contact with the rail 51 as shown in the figure. Can be fixed on top.

Further, although not shown, the receiving metal fitting auxiliary material 10 may be provided as a member for fixing the lock key, not as a wire rope attaching member. The lock key can be fixed by welding, brazing, bolting, chain fixing, etc., and it can be attached so that it cannot be easily removed unless the lock of the snatch lock 4 is unlocked according to the lock key. It's fine.

FIG. 6 is an explanatory view of the switchgear 1 of the present invention attached to the rail 51 as viewed from the ground side. As shown in the figure, in the switchgear 1, both side plates 13 are fixed to the rail 51 via the device mounting material 16 with switchgear mounting bolts 15 in which the collar 17 is fitted.

The case 3 of the switchgear 1 is attached to one of the side plates 13 with a hinge 14. In FIG. 6A, with the switchgear 1 unlocked, the snatch lock 4 is unlocked, the case 3 of the switchgear 1 is unlocked, and the traveling surface 53 of the rail 51 is opened. .. When opened to the state of (a), there is no hindrance to the running of the rail 51 of the cutout switch 61.

In FIG. 6B, with the switchgear 1 locked, the snatch lock 4 locks the bracket 9, and the locking member 11 attached to the bracket 9 is the locking groove of the case 3 and the side plate 13. The case 3 of the switchgear 1 is fitted on the rail 51 and fixed on the traveling surface 53 of the rail 51.

As shown in this figure, it is safe to bring the cutout 61 into contact with the switchgear 1 while the case 3 of the switchgear 1 is fixed to the rail 51 and the cutout 61 is mounted on the rail 51. A keyhole 19 which is an opening of the case 3 and a keyhole 18 which is a groove on the upper part of the case 3 are set so that a part of the vessel 61 can enter the case 3.

Since the cutout switch 61 of FIG. 3 is provided with two lever plates 63 so as to sandwich the connecting plate 65 in between, two corresponding key grooves 18 are also provided. In this way, since the keyhole 19 and the keyhole 18 are set according to the structure peculiar to each cutout 61, the cutout 61 of a type that does not correspond does not fit the keyhole 18 and the keyhole 19. By giving the cutout 61 selectivity, the cutout 61 can be used as a more advanced key.

FIG. 7 shows a state in which the switchgear of the present invention is unlocked by the cutout 61 of the fall prevention device. As shown in the figure, when the cutout 61 is attached to the rail 51 and the cutout 61 is brought into contact with the opening / closing device 1 from the ground side, the lever plate 63 of the cutout 61 fits into the keyhole 18 at the upper part of the case 3. The joint portion between the lever plate 63 and the main body base 62 enters the keyhole 19 of the case 3, pushes the contact surface 8 of the lever auxiliary metal fitting 7, pushes up the trigger lever 6, and unlocks the snatch lock 4. When the lock is released, the receiving metal fitting 9 is disengaged, the locking member 11 and the locking groove 12 are disengaged, the wire rope 2 is also disengaged, and the wire rope 2 becomes free. If the lock key is fixed instead of the wire rope 2, the lock key becomes free.

In this case, the keyway 18 and the keyhole 19 are set so as to match the cutout switch 61 of the fall prevention device shown in FIG. 3, which corresponds to the rail 51 of the fall prevention device shown in FIG. 2 to which the switchgear 1 is attached. Therefore, since the switchgear 1 cannot be unlocked without using this specific cutout 61, it is essential for the person concerned with the work to bring in the matching cutout 61.

Further, in this unlocking operation, the cutout 61 is attached to the rail 51 of the fall prevention device, and the cutout 61 is run along the rail 51, which is the same operation as the procedure for using the fall prevention device. If this unlocking operation and the life rope of the worker are connected to the cutout 61, the fall prevention device can be used at the time of ascending the tower. By making it mandatory to bring in the cutout 61 and also to attach it to the rail 51, it is possible to suppress the choice of not using this fall prevention device when ascending the tower.

It is relatively easy to lock the wire rope 2 so that unlocking is difficult unless one end side is free. For example, after wrapping the wire rope 2 with one end fixed around the gassho part of the locked part of the necessary equipment, or after wrapping it with the wire rope 2 having a ring at one end and passing through this ring, the wire rope 2 The equipment can be locked by the opening / closing device 1 of the present invention only by fixing the receiving metal fitting 9 to which the free end side is attached to the opening / closing device 1.

Further, the equipment is not limited to the direct locking by the wire rope 2, but the equipment is engaged by using some kind of engaging member, the wire rope 2 is attached to one or both of the engaging members, and one end side of the wire rope 2 is attached. Can be locked to the equipment by fixing the wire rope 2 to the opening / closing device 1 of the present invention with the receiving metal fitting 9 and limiting the freedom of the engaging member attached to the wire rope 2.

Needless to say, it is possible to lock the above equipment using a lock. Using the lock key fixed to the receiving metal fitting 9, the locks of these facilities can be unlocked. The lock may be any lock that can be unlocked directly or indirectly by using the lock key fixed to the receiving metal fitting 9, and the lock is not particularly limited to a padlock, an electronic lock, or the like. The lock key is not particularly limited to a jagged key, a dimple key, a card key, or the like, and may be a display object of an encryption key.

For example, if the gassho portion 89 of the tower rise prevention device 81 is locked by using the opening / closing device 1 of the present invention, the tower cannot be lifted because it cannot be unlocked without the matching cutout 61. Specifically, if a padlock is locked on the gassho portion 89 and the receiving metal fitting 9 to which the padlock key is fixed is locked to the opening / closing device 1, the tower cannot be ascended without the cutout 61. Further, if the locking member 78 of the elevating ladder 71 is locked, the elevating ladder 71 cannot be used in the same manner. Of course, the tower rise prevention device 81 and the elevating ladder 71 can be locked together.

FIG. 8 shows an example of the opening / closing device of the present invention provided with a locking mechanism for the trigger lever 6. FIG. 8 shows an enlarged cross section of a portion related to the locking mechanism of the trigger lever 6.

As shown in the figure, in this lock mechanism, a protrusion 24 is provided on the trigger lever auxiliary metal fitting 7, a guide 25 is attached to the upper part of the case 3, and a lever lock metal fitting 21 that can move along the guide 25 is provided. It is a thing. The lever lock fitting 21 is provided with an engaging portion 22.

FIG. 8A shows a locked state. In the locked state of this lock mechanism, the lever lock metal fitting 21 is arranged on the right side as shown in the figure. Normally, the lever lock bracket 21 is installed so that the right side of the figure faces the ground, so the lever lock bracket 21 is urged to the right side by gravity. , A spring, etc. is provided to urge the right side.

FIG. 8B shows a state in which the lock mechanism is operated. As shown in the figure, even if the trigger lever 6 may be pushed up due to an illegal unlocking operation or the like, if the engaging portion 22 of the lever lock fitting 21 is on the right side of the protruding portion 24 of the auxiliary fitting 7. The engaging portion 22 of the lever lock fitting 21 does not get in the way, the trigger lever 6 is not pushed up any more, and the snatch lock 4 is not unlocked.

As described above, the lever lock metal fitting 21 is always urged to the right side, and the engaging portion 22 of the lever lock metal fitting 21 is on the right side of the protrusion 24 of the auxiliary metal fitting 7 as in (a). The operation of this lock mechanism is not released unless the lever lock metal fitting 21 is moved by a normal unlocking operation.

FIG. 8C shows a state during a normal unlocking operation. When the unlocking operation of the switchgear 1 is normally performed by the cutout 61, the lever plate 63 of the cutout 61 is inserted in the keyhole 18, and the joint portion between the lever plate 63 of the cutout 61 and the main body base 62 is inserted. Enters the keyhole 19 of the case 3.

At that time, the joint portion between the lever plate 63 of the cutout 61 and the main body base 62 hits the contact surface 8 of the lever auxiliary metal fitting 7 and pushes up the trigger lever 6, but at the same time, the cutout that has entered the keyway 18. The lever plate 63 of 61 moves the lever lock metal fitting 21 to the left side.

In the lock mechanism using the lever lock metal fitting 21 , when the auxiliary metal fitting 7 is pushed up, the engaging portion 22 of the lever lock metal fitting 21 is a protrusion of the auxiliary metal fitting 7 when the unlocking operation is performed normally. It is adjusted so that it can move to the left side beyond the portion 24, and (c) is a state in which the engaging portion 22 just exceeds the protrusion portion 24.

FIG. 8D shows a state in which a normal unlocking operation is completed. During normal unlocking operation, the lever lock bracket 21 moves to the left as shown in the figure, the auxiliary bracket 7 is pushed up to the limit without being disturbed by the engaging portion 22, and the snatch lock is performed by the trigger lever 6 that is pushed up at the same time. 4 is released.

If the engaging portion 22 exceeds the protrusion 24 to the left as in (c), the engaging portion 22 of the lever lock metal fitting 21 does not interfere with the auxiliary metal fitting 7 being pushed up. As described above, the auxiliary metal fitting 7 can be pushed up until the snatch lock 4 is released by the trigger lever 6.

The locking mechanism using the lever locking bracket 21, as the auxiliary metal fitting 7 is pushed up further, the lever lock fitting 21 by the lever plates 63 is pushed to the left, the lever locking fitting 21 by the pushing It can also be created so as to avoid the interference of the auxiliary metal fitting 7. Furthermore, if this push-in is set to be mandatory, unauthorized unlocking becomes more difficult.

Further, since the urging force to the right side of the lever lock metal fitting 21 may be small, if the engaging portion 22 exceeds the protrusion 24 to the left side, the lever lock metal fitting 21 can be easily pushed up when the auxiliary metal fitting 7 is pushed up. It is also possible to create it so that it moves to the left.

Various types of lock mechanisms such as using other switches can be considered as the lock mechanism of the trigger lever 6, but the lock mechanism illustrated here is relatively simple and can be easily attached to the opening / closing device 1.

As described above, if the switchgear 1 of the present invention is used, the cutout 61 that matches the rail 51 of the fall prevention device at each site is the key, so it is essential to bring in the cutout 61, and the fall prevention device is used. It is possible to deter the ascent of the tower without it. The switchgear 1 of the present invention is designed by utilizing the unique features of the rail 51 of the fall prevention device and the cutout switch 61, such as the shapes of the keyhole 19 and the keyway 18, and is manufactured and sold in the past. The device 61 can also be used as a key, and cannot be unlocked with the cutout 61 that does not correspond to the rail 51 at the site.

In recent years, even power transmission towers are becoming more and more IT-oriented, so switchgear that can be unlocked only with a specific cutout 61 is provided by combining the installation of an IC tag on the cutout 61 and the installation of an electronic lock on site. However, at present, the switchgear of the present invention is considered to be superior in terms of cost and attachment of an IC tag to an old cutout. Further, the opening / closing device of the present invention is superior in that the operation of the fall prevention device is used for the unlocking operation.

Further, even if the switchgear of the present invention is a fall prevention device other than the box-shaped rail as shown in FIG. 2 and the corresponding safety device as shown in FIG. 3, the switchgear matches the rail and the cutout of the other fall prevention device. If the shape of the keyway or keyhole is designed so as to be used, it can be easily deployed as a switchgear for the fall prevention device.

1 Switchgear 2 Wire rope 3 (Switchgear) Case 4 Snatch lock 5 Lock part (catch part of receiving bracket)
6 Trigger lever 7 (for lever) Auxiliary metal fittings 8 Contact surface 9 Receiving metal fittings 10 Receiving metal fittings Auxiliary material 11 Locking member 12 Locking groove 13 Side plate 14 Hinge 15 Switchgear mounting bolt 16 Device mounting material 17 Color 18 Keyhole 19 Keyhole 21 Lever lock metal fittings 22 Engagement part 24 (Auxiliary metal fittings) protrusion
25 Guide 51 (Crash prevention device) Rail 52 Open groove 53 Running surface 54 Rail mounting material 61 (Crash prevention device) Cutout 62 Main body base 63 Ladder plate 64 Guide part 65 Connecting plate 66 Roller 67 Guide roller 68 Body rope threading Hole 69 Key lock rope through hole 71 Elevating ladder 72 Ladder support 73 Step 74 Elevating prevention part 76 Door member 76a Fixed end 76b Free end 77 Hinging part 78 Locking member 79 Ground 81 Ascending tower prevention device 82 (of steel tower) Pillar 83 Inner frame 84 Outer frame 85 Opening and closing frame 86 Wire mesh 87 Mounting member 88 This plate 89 Gassho part

Claims (5)

Engages with a case provided with a keyhole for inserting a part of the cutout of the fall prevention device, a snatch lock housed in the case with the trigger lever facing toward the keyhole, and a lock portion of the snatch lock. It is an opening / closing device having a receiving metal fitting and a mounting member for mounting on the rail of the fall prevention device, and the metal fitting is provided with a wire rope mounting portion or a lock key is fixed to the bracket. An opening and closing device characterized by being When the cutout mounted on the rail of the fall prevention device is run along the rail and brought into contact with the switchgear attached to the rail of the fall prevention device and fixed to the case, the said switchgear according to claim 1 in which a part of the safety device, characterized in that fitted into the keyhole of the case. The switchgear according to claim 1 or 2, wherein a keyhole that fits a part of the cutout is provided in the upper part of the keyhole of the case. The switchgear according to claim 3, further comprising a locking mechanism for the trigger lever, which is released by fitting the cutout into the keyway. The switchgear according to any one of claims 1 to 4, wherein the receiving metal fitting includes a locking member for fixing the case.

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