JP2018003436A - Fall prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device capable of preventing an operator from ascending or descending on a ladder, without using a safety block.SOLUTION: A fall prevention device 10 comprises a cover 20 arranged so as to cover the front side of a ladder 11 having a pair of vertical woods 12 and a plurality of crossbars 13 arranged between the pair of vertical woods 12 and liftably movable to the ladder 11 and an installation member 60 for connecting the cover 20 and a safety lock device 30 fixed to the upper part vicinity of the ladder 11, and the installation member 60 connects the cover 20 and a safety belt 50 of an operator M. An opening part 23 is formed in the cover 20 so that the operator M can access a part among the plurality of crossbars 13. The opening part 23 of the cover 20 ascends or descends to the ladder 11 in response to the fact that the operator M ascends or descends on the ladder 11 in a state of connecting the installation member 60 to the safety belt 50 of the operator M.SELECTED DRAWING: Figure 2

Description

  The present embodiment relates to a crash prevention device.

  Conventionally, for example, when performing cable wiring work, an operator needs to go up to a high place using a ladder. When performing such high place work, it is common to use the safety block which is a safety device with a ladder. That is, a safety block is attached to the upper portion of the ladder in advance, and when climbing the ladder, a safety rope extending from the safety block is connected to an operator's safety belt. In this state, if the worker raises or lowers the ladder, even if the worker steps off the ladder, the safety block stops halfway, so that there is no accident that the worker will fall It has become.

  However, when performing such high altitude work, some workers may raise or lower the ladder without using the safety block consciously or unconsciously. Therefore, in the unlikely event that the safety block is not used and the foot is removed from the ladder, the worker may fall from a high place. For this reason, the manager needs to monitor the work in order to instruct the worker to use the safety block or to confirm that the safety block is being used.

Utility Model Registration No. 3181831

  This embodiment is made in view of such a situation, and provides the fall prevention device which can prevent an operator from raising / lowering a ladder without using a safety block. Objective.

  The fall prevention device according to the present embodiment is a fall prevention device, and is arranged so as to cover a front side of a ladder having a pair of vertical trees and a plurality of cross bars arranged between the pair of vertical trees. A cover that can be moved up and down, a first connecting member that connects the cover and a safety lock device fixed near the top of the ladder, the cover, and a safety belt for the operator An opening is formed in the cover so that the worker can access a part of the plurality of rungs, and the second connection member is the work. The opening of the cover moves up and down with respect to the ladder as the worker raises and lowers the ladder while being connected to the safety belt of the person.

FIG. 1 is a side view showing a fall prevention device according to the first embodiment. FIG. 2 is a front view showing the fall prevention device according to the first embodiment. FIG. 3 is a view showing an attachment member of the fall prevention device according to the first embodiment. 4A and 4B are side views showing a crash prevention device according to a modification of the first embodiment. FIG. 5 is a front view showing a method of using the fall prevention device according to the first embodiment. FIG. 6 is a front view showing a method of using the fall prevention device according to the first embodiment. FIG. 7 is a front view showing a crash prevention device according to the second embodiment.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

(First embodiment)
First, the configuration of the fall prevention device according to the first embodiment will be described with reference to FIGS. 1 to 3 are views showing a crash prevention device 10 according to the present embodiment.

  A crash prevention device 10 shown in FIGS. 1 and 2 includes a cover 20 disposed so as to cover the front side of the ladder 11 (the side on which the worker M moves up and down), a cover 20 and a safety block (safety lock device) 30. A first connecting member (attachment member 60) that connects the safety belt 33 via the safety rope 33 and a second connection member (attachment) that connects the cover 20 and the safety band 50 of the worker M via the connection rope 40. Member 60). In this case, the mounting member 60 serves as both the first connecting member and the second connecting member, but the first connecting member and the second connecting member may be composed of different members.

  The ladder 11 has a pair of vertical trees 12 that extend in a substantially vertical direction and are spaced apart from each other, and a plurality of cross bars 13 that are arranged between the pair of vertical trees 12 and extend in a substantially horizontal direction. . The ladder 11 may be made of metal, synthetic resin, bamboo, or wood.

  The cover 20 extends from the upper part of the ladder 11 to the lower part in a band shape on the front side of the ladder 11. The cover 20 can be moved up and down with respect to the ladder 11. The cover 20 is made of a cloth-like flexible member. Note that the cover 20 does not necessarily have a strength that can support the weight of the worker M.

  A winding mechanism 21 that winds the cover 20 upward is provided at the upper end of the ladder 11. In addition, a cover 20 is wound around the lower end of the ladder 11, and an unwinding mechanism 22 that unwinds the cover 20 is provided. The cover 20 is unwound from the unwinding mechanism 22 and is wound upward by the action of the winding mechanism 21. On the other hand, when the operator M pulls the pulling rope 31, the cover 20 is lowered against the force of the winding mechanism 21.

  In the present embodiment, the cover 20 can be applied to the ladder 11 having various lengths by appropriately adjusting the vertical distance between the winding mechanism 21 and the unwinding mechanism 22. For example, the cover 20, the winding mechanism 21, and the unwinding mechanism 22 may be integrated and detachable from the ladder 11. In this case, the integrated cover 20, winding mechanism 21, and unwinding mechanism 22 can be attached to the ladder 11 having various lengths.

  The cover 20 is formed with a rectangular opening 23 so that the worker M can access a part of the plurality of cross bars 13 of the ladder 11. That is, some crosspieces 13 are exposed from the opening 23, and the worker M can use only the crosspieces 13 exposed from the opening 23.

  On the other hand, a covering region 24 is formed in the cover 20 except for the opening 23. The covering region 24 covers a part of the cross 13 of the ladder 11. Therefore, the worker M cannot access the crosspiece 13 covered with the covering region 24 and cannot move the ladder 11 up and down using the crosspiece 13.

  Further, in the cover 20, cover side end portions 25 narrower than the entire width of the cover 20 are formed on both sides of the opening portion 23, and the covering region 24 is held by the pair of cover side end portions 25.

  As shown in FIGS. 2 and 3, an attachment member 60 is attached to the cover 20. The attachment member 60 is fixed to the side of the opening 23 of the cover 20. The attachment member 60 can be moved up and down integrally with the cover 20 with respect to the ladder 11. As will be described later, the safety member 33, the connecting rope 40, and the pulling rope 31 are all connected to the mounting member 60.

  A safety block (safety block, safety lock device) 30 is fixed near the top of the ladder 11 and has a housing 32 suspended from a high place. The safety rope 33 extends substantially downward from the housing 32. A safety rope mounting bracket 34 is provided at the tip of the safety rope 33. The safety block 30 is connected to the cover 20 by connecting the safety rope mounting bracket 34 to the mounting member 60. When the safety rope 33 is pulled out from the housing 32 of the safety block 30 at a high speed, such as when it crashes, the locking function of the safety block 30 is activated and the safety rope 33 is locked. A tension rope (not shown) is connected to the safety rope 33, and the operator M can pull the safety rope 33 downward from the housing 32 by pulling the tension rope. It can be easily connected to the member 60.

  The connection rope 40 (connection member) is connected to the attachment member 60 via the connection rope attachment fitting 41. The connecting rope mounting bracket 41 is provided at one end of the connecting rope 40. At the other end of the connecting rope 40, a safety band mounting bracket 42 is provided. By connecting the safety band mounting bracket 42 to, for example, a hook (not shown) of the safety band 50 of the worker M, the cover 20 and the worker M are connected to each other.

  A tension rope 31 is attached to the attachment member 60 via a tension rope attachment fitting 61. The pull rope 31 is connected to the cover 20 via the attachment member 60. When the operator M pulls the pull rope 31, the cover 20 can be moved downward against the force of the winding mechanism 21.

  In addition, as shown to Fig.4 (a), the cover 20 may be made into an endless thing and the cover 20 may be spanned over the perimeter of the front side of the ladder 11, and a back side. Further, as shown in FIG. 4B, an unwinding mechanism 22 that unwinds the cover 20 may be disposed on the front side of the cover 20.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, a method of using the fall prevention device 10 when the worker M climbs the ladder 11 will be described.

  First, as shown in FIG. 2, the worker M is located on the front side of the crash prevention device 10 on the ground. At this time, the cover 20 of the fall prevention device 10 is wound upward by the action of the winding mechanism 21. Therefore, the opening 23 of the cover 20 is located on the upper side of the ladder 11, and the lower part of the ladder 11 is covered with the cover 20. In this state, it is impossible for the worker M to go up the ladder 11.

  Next, the worker M pulls the pulling rope 31 downward. At this time, the attachment member 60 is moved downward by the pulling rope 31, whereby the cover 20 is lowered against the winding force of the winding mechanism 21.

  Subsequently, as shown in FIG. 5, the opening 23 of the cover 20 descends to the lower part of the ladder 11. In this case, the worker M can access the crosspiece 13 located under the ladder 11. Next, the worker M connects the safety band mounting bracket 42 provided on the connecting rope 40 to his / her safety band 50. Thus, the safety band 50 and the safety block 30 of the worker M are connected to each other via the attachment member 60 and the connection rope 40.

  Next, as shown in FIG. 6, the worker M raises the ladder 11 by using the crossbar 13 that is accessible from the opening 23 of the cover 20. During this time, the cover 20 is pulled upward by the winding force of the winding mechanism 21. On the other hand, since the connecting rope 40 is connected to the safety belt 50 of the worker M, the distance between the attachment member 60 and the worker M is substantially constant. For this reason, as the worker M raises the ladder 11, the position of the opening 23 of the cover 20 also rises with respect to the ladder 11.

  In this way, the worker M can move to above the ladder 11 in a state where the safety belt 50 and the safety block 30 are connected. On the other hand, if the worker M does not connect the safety belt mounting bracket 42 to the safety belt 50, the opening 23 of the cover 20 is lifted by the winding force of the winding mechanism 21, so that the worker M It becomes difficult to access the opening 23. For this reason, it is substantially impossible for the worker M to raise the ladder 11 without connecting the safety block 30 to the safety belt 50.

  After the worker M arrives above the ladder 11, the worker M hangs the hook of the safety belt 50 on another place (handrail or the like), and then removes the safety belt mounting bracket 42 from the safety belt 50. Thereafter, the worker M performs work at a high place.

  Next, a method of using the fall prevention device 10 when the worker M descends the ladder 11 will be described.

  First, the worker M moves above the crash prevention device 10. At this time, the cover 20 of the fall prevention device 10 is wound upward by the action of the winding mechanism 21. For this reason, the opening 23 of the cover 20 is located on the upper side of the ladder 11. Therefore, the worker M can access the crosspiece 13 located on the top of the ladder 11.

  Next, the worker M connects the safety belt mounting bracket 42 provided on the connecting rope 40 to his safety belt 50, and then removes the hook of the safety belt 50 from the handrail or the like. Thus, the safety band 50 and the safety block 30 of the worker M are connected to each other via the attachment member 60 and the connection rope 40.

  Subsequently, the worker M descends the ladder 11 by using the crossbar 13 accessible from the opening 23 of the cover 20. During this time, the cover 20 is pulled upward by the winding force of the winding mechanism 21. On the other hand, since the connecting rope 40 is connected to the safety belt 50 of the worker M, the distance between the attachment member 60 and the worker M is substantially constant. For this reason, as the operator M descends the ladder 11, the position of the opening 23 of the cover 20 also descends with respect to the ladder 11.

  Thus, the worker M can move to the ground in a state where the safety belt 50 and the safety block 30 are connected. On the other hand, if the operator M does not connect the safety band mounting bracket 42 to the safety band 50, the opening 23 of the cover 20 is raised by the winding force of the winding mechanism 21. For this reason, it is substantially impossible for the worker M to descend the ladder 11 without connecting the safety block 30 to the safety belt 50.

  As described above, the safety belt mounting bracket 42 is necessarily connected to the safety belt 50 of the worker M during the raising / lowering operation of the ladder 11. For this reason, even if the worker M steps off the ladder 11, the safety block 30 functions via the connecting rope 40 and the attachment member 60. That is, when the connecting rope 40 is pulled, the safety rope 33 is pulled out at a high speed. In this case, the lock function of the safety block 30 works and the safety rope 33 is locked. For this reason, the accident that the worker M crashes can be prevented.

  As described above, according to the present embodiment, the connecting rope 40 connected to the safety belt 50 of the worker M and the safety block 30 are connected to the cover 20. An opening 23 is formed in the cover 20 so that the worker M can access a part of the plurality of rungs 13 of the ladder 11. With the connecting rope 40 connected to the safety belt 50 of the worker M, the opening 23 of the cover 20 moves up and down as the worker M moves up and down the ladder 11. Therefore, it is impossible for the worker M to move up and down the ladder 11 in a state where the safety belt 50 and the safety block 30 of the worker M are not connected to each other. Thereby, the ladder 11 is not raised and lowered without using the safety block 30 consciously or unconsciously, and an accident in which the operator M falls from a high place can be surely prevented.

  Further, according to the present embodiment, since the pulling rope 31 for pulling the cover 20 downward is attached to the cover 20, the operator M pulls the pulling rope 31 when climbing the ladder 11. Twenty openings 23 can be lowered.

  Further, according to the present embodiment, the attachment member 60 is attached to the cover 20, and the safety block 30 and the connecting rope 40 are connected to the cover 20 via the attachment member 60. Thereby, the cover 20, the safety block 30, and the connecting rope 40 can be integrally attached by the attachment member 60.

  Moreover, according to this embodiment, the winding mechanism 21 which winds the cover 20 upward is provided. Thereby, in a state where the connecting rope 40 is not connected to the safety belt 50 of the worker M, the opening 23 of the cover 20 is located at the upper part of the ladder 11, so that the connecting rope 40 is connected to the safety belt 50 of the worker M. Without connection, the worker M cannot go up the ladder 11.

  Moreover, according to this embodiment, since the cover 20 is detachable with respect to the ladder 11, the cover 20 can be attached to the ladder 11 of various lengths.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. FIG. 7 is a front view showing a crash prevention device according to the second embodiment. The second embodiment shown in FIG. 7 uses a safety lock device 37 directly connected to the cover 20 in place of the safety block 30, and the other configuration is substantially the same as the first embodiment described above. is there. In FIG. 7, the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, in the fall prevention device 10 </ b> A according to the present embodiment, a safety lock device 37 is directly connected to the upper end of the cover 20. An attachment member 60 (a connecting member) connects the cover 20 and the worker M's safety belt 50. The safety lock device 37 is usually wound up with the cover 20 facing upward.

  The fall prevention device 10A according to the present embodiment is used in a substantially similar manner to the fall prevention device 10 in the first embodiment described above during normal times. On the other hand, when the cover 20 is pulled out from the safety lock device 37 at a high speed, such as when it crashes, the lock function of the safety lock device 37 works and the cover 20 is locked. For this reason, the accident that the worker M crashes can be prevented. For this reason, in this embodiment, it is preferable that the cover 20 is a cloth-like member having sufficient strength to support the weight of the worker M.

  Although several embodiments have been described above, these embodiments are presented as examples, and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 Fall prevention device 11 Ladder 12 Vertical wood 13 Horizontal wood 20 Cover 21 Winding mechanism 22 Unwinding mechanism 23 Opening part 24 Covering area 25 Cover side edge part 30 Safety block (safety locking device) 31 Pulling rope 32 Housing 33 Safety rope 34 Safety Rope mounting bracket 37 Safety lock device 40 Linking rope 41 Linking rope mounting bracket 42 Safety band mounting bracket 50 Safety band 60 Mounting member 61 Tension rope mounting bracket

Claims (6)

A crash prevention device,
A cover that is arranged so as to cover the front side of the ladder having a pair of vertical trees and a plurality of cross bars arranged between the pair of vertical trees, and a cover that can be moved up and down relative to the ladder;
A first connecting member for connecting the cover and a safety lock device fixed near the top of the ladder;
A second connecting member for connecting the cover and the worker's safety belt;
An opening is formed in the cover so that the worker can access a part of the plurality of crossbars,
With the second connecting member connected to the safety belt of the worker, the opening of the cover is raised and lowered with respect to the ladder as the worker raises and lowers the ladder. Fall prevention device.   The fall prevention device according to claim 1, wherein a pulling rope for pulling the cover downward is attached to the cover.   The fall prevention device according to claim 1 or 2, wherein an attachment member is attached to the cover, and the attachment member also serves as the first connection member and the second connection member.   The fall prevention device according to any one of claims 1 to 3, further comprising a winding mechanism that winds the cover upward.   The fall prevention device according to any one of claims 1 to 4, wherein the cover is detachable from the ladder. A crash prevention device,
A cover that is arranged so as to cover the front side of the ladder having a pair of vertical trees and a plurality of cross bars arranged between the pair of vertical trees, and a cover that can be moved up and down relative to the ladder;
A connecting member for connecting the cover and a worker's safety belt;
The cover and a safety lock device fixed near the top of the ladder are connected,
An opening is formed in the cover so that the worker can access a part of the plurality of crossbars,
A fall prevention device in which the opening of the cover moves up and down with respect to the ladder as the worker moves up and down the ladder in a state where the connecting member is connected to the safety belt of the worker. .

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