JP4328010B2 - Tool fall prevention tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool fall prevention tool that elastically connects tools so that the tools are not dropped, for example, during high-altitude work.
[0002]
[Prior art]
As a tool fall prevention tool used to ensure safety when a tool is dropped from a hand during a high place work at a construction site or the like, conventionally, for example, Japanese Utility Model Publication No. 6-38995 What is disclosed is known.
[0003]
As shown in FIG. 8, the tool fall prevention tool described in the above publication is in a state of being rotatable around a shaft 2 in a case 1 that is locked to a belt worn by an operator on the waist. The drum 3 is housed, and a locking tool 5 for attaching a tool to the tip of a string-like body or belt-like body (hereinafter referred to as a string-like body) 4 wound around the drum 3 and fed out of the case 1. The drum 3 is urged in the winding direction of the string-like body 4 by a spring body incorporated in the inner periphery thereof.
[0004]
That is, as shown in FIG. 7, this tool fall prevention tool fixes the case 1 to a belt 6 or the like worn by the operator A on his / her waist when working at a high place, and engages the tip of the string-like body 4. The tool B is attached to the stopper 5 and used. When the tool B is used, the string-like body 4 is pulled out from the case 1 against the urging force in the winding direction by the spring body, and as shown in FIG. When the operator A drops the tool B, the string-like body 4 is pulled out by the fall of the tool B from the case 1 attached to the waist belt 6 of the operator A, and is stored by the rotation of the drum 3 in the process. The urging force of the spring body stops the fall of the tool B and absorbs the impact force caused by the fall.
[0005]
[Problems to be solved by the invention]
However, since the tool fall prevention tool according to the above-described conventional technique is provided with the drawer opening (opening) 1a of the string-like body 4 fixed to the case 1, the operator A uses the tool B to perform various operations. Accordingly, when the pulling angle of the string-like body 4 from the case 1 changes as shown by the one-dot chain line in FIG. 8, the resistance due to the friction between the draw-out port 1a and the string-like body 4 increases. For this reason, the problem that the smooth pull-out and retraction of the string-like body 4 is hindered and workability is deteriorated, and the string-like body 4 is easily damaged by wear is pointed out.
[0006]
When the tool B is released from the hand, the tool B is lowered while the string-like body 4 is pulled out until the weight of the tool B and the stored force of the spring body that biases the drum 3 in the winding direction are balanced ( Therefore, the conventional tool fall prevention tool does not have a function of holding the tool B on the worker A's body. For this reason, in order for the operator A to carry the tool B, it is necessary to attach the tool storage bag 7 or the like to the waist belt 6 of the operator A and store the tool B in addition to the tool fall prevention tool. there were.
[0007]
The present invention has been made in view of the above problems, and the technical problem is that in a tool fall prevention tool, workability deterioration due to a change in the pulling angle of the string-like body and the string-like body It is to effectively prevent wear and to provide a function as a tool holding means to the tool fall prevention tool.
[0008]
[Means for Solving the Problems]
As means for effectively solving the technical problem described above, a tool fall prevention device according to the invention of claim 1 includes a drum rotatably accommodated in a case, a winding guide wound around the drum A string-like, thread-like or strip-like body that is drawn out from the case feed window through the member and can be attached to the tip of the tool; and the drum arranged in the drum is made of the string-like, thread-like or belt-like body A spiral spring urging in the winding direction, and the feeding guide member is movable in the circumferential direction by loosely fitting in a holding groove formed in an arc shape concentric with the drum on the inner side surface of the case has an arc-shaped slide guide portion which is guided in, provided on the string-like, circumferential movably in said case the feeding Madonai according drawer angle of string or strip material along the holding groove The is intended.
[0009]
Moreover, the tool fall prevention tool according to the invention of claim 2 is the structure of claim 1, wherein the feeding window is composed of a narrow part extending on the lower surface when the case is mounted and a wide part extending in the vertical direction, A stopper that cannot pass through the narrow portion and can pass through the wide portion is provided at or near the leading end of the string-like, thread-like, or belt-like body.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a tool fall prevention tool according to the present invention will be described with reference to FIGS. 1 to 5. First, FIG. 1 is a perspective view showing the appearance of the front side of the tool drop prevention tool, FIG. 2 is an explanatory diagram of the internal structure, and FIG. 3 is a rear view.
[0011]
The tool fall prevention tool is wound around a case 10, a drum 20 rotatably accommodated in the case 10, a spiral spring 30 disposed on the inner periphery of the drum 20, and an outer periphery of the drum 20. A thin wire rope 40 as a string-like body, a wire passing member 50 that is a feed guide member that passes the wire rope 40 drawn from the drum 20, and a wire rope that is drawn to the outside of the case 10 through the wire pass member 50 40 and a connecting tool 60 attached to the leading end (tip).
[0012]
The case 10 is made of a synthetic resin and has a structure that is divided into two in the thickness direction. That is, the case divided body 10A and the case divided body 10B are inserted into a plurality of screws provided in the case divided body 10A. The holes 11 are releasably coupled by a plurality of screws 12 that are screwed into screw holes (not shown) of the case divided body 10B through each of the holes 11 and approximate one of the diagonal shapes of the rectangle cut into an arc shape. It has a front shape. Further, on the outer surface on the back side of the case division body 10B, a belt loop 13 is formed through which a user (operator) can pass the belt 6 attached to his / her waist.
[0013]
Formed on the inner surface of the case 10 (case divided bodies 10A and 10B) are a circular drum housing portion 14 and a holding groove 15 which is located on the outer peripheral side of the drum housing portion 14 and extends in a concentric arc shape. The arc-shaped wall surface 16 separating the holding groove 15 and the drum housing portion 14 is cut out at an intermediate portion to form a wire lead-out portion 16a. Further, among the side surfaces in the thickness direction of the case 10, a wire feeding window 17 is opened from one vertical side surface 10a to one end portion of the lower side surface (bottom surface) 10b. A portion from the lower portion to one end portion of the lower side surface 10b is a narrow narrow portion 17a, and a portion above it is formed as a wide portion 17b. The wire lead-out portion 16 a is formed in a direction and length substantially corresponding to the wide portion 17 b in the wire feeding window 17.
[0014]
The drum 20 has a spiral spring accommodating portion 21 and a reel portion 22 formed on the outer periphery thereof, and a wire rope 40 is wound around the reel portion 22. The drum 20 is accommodated in the drum accommodating portion 14 of the case 10 (case divided body 10A) in a state where the outer peripheral edge of the reel portion 22 is loosely fitted, and the drum is accommodated on the inner side surface of the case divided body 10A. A spring core 18 projecting from the axial center of the portion 14 passes through a shaft hole formed in the center of the spiral spring accommodating portion 21.
[0015]
The spiral spring 30 is composed of a relatively long first elastic plate 31 and a plurality of (for example, four) first elastic plates 31 having the same material, thickness and width and relatively short length. The two elastic plates 32 are overlapped in the plate thickness direction so that one ends thereof are aligned, and are bound by rivets (not shown), and circulate around the outer periphery of the spring core 18 in the spiral spring accommodating portion 21 in the drum 20. It is arranged by winding. Then, the unbound end portion of the long first elastic plate 31 is locked to the spring core 18, and the end portion where the first and second elastic plates 31 and 32 are bound is locked to the spiral spring accommodating portion 21 of the drum 20. The first and second elastic plates 31 and 32 are wound so that the first elastic plate 31 is on the outer side in the winding direction and the second elastic plate 32 is on the inner side in the winding direction.
[0016]
For this reason, the spiral spring 30 has a two-stage characteristic in which the portion consisting only of the first elastic plate 31 has a low spring constant, and the overlapping portion of the elastic plates 31 and 32 has a high spring constant. Accordingly, when the drum 20 rotates in the clockwise direction in FIG. 2 by pulling the wire rope 40 to the outside of the case 10, the spiral spring 30 is first brought into contact with the first elastic plate 31 by the spring core. 18, and the wire rope 40 is pulled out by a predetermined length (in this example, about 1200 mm), and after the winding of the first elastic plate 31 is finished, the overlapping portions of the elastic plates 31 and 32 are wound. It is like that.
[0017]
The wire passing member 50 is integrally projected from the arcuate slide guide part 51 loosely fitted in the arcuate holding groove 15 in the case 10 to the outer peripheral side from the center in the extending direction of the slide guide part 51. Main body 52. The main body portion 52 is provided with a wire through hole 52a through which the wire rope 40 fed from the drum 20 is passed.
[0018]
The holding groove 15 of the case 10 is formed to be longer in the circumferential direction than the slide guide portion 51 of the wire passing member 50, and the main body portion 52 is located in the wide portion 17 b of the wire feeding window 17 of the case 10. For this reason, the wire passing member 50 can move within a predetermined angle range along the holding groove 15, and accordingly, the main body portion 52 of the wire passing member 50 moves up and down in the wide portion 17 b of the wire feeding window 17. Can be moved to.
[0019]
A spherical stopper 41 is fixed near the tip of the wire rope 40 to which the connecting tool 60 is attached. The stopper 41 can pass through the wide portion 17b of the wire feed window 17 of the case 10, but cannot pass through the narrow portion 17a of the wire feed window 17, and the narrow portion 17a side of the wide portion 17b. It is formed in a size that can be accommodated in the inner space of the flange portion 17c formed at the end portion.
[0020]
The tool fall prevention tool according to the first embodiment configured as described above allows the case 10 to pass through the belt thread 13 of the case 10 by passing the belt 6 worn on the waist by the operator during work at a high place. Is fixed to the waist, and the tool is attached to the attachment device 60 at the tip of the wire rope 40. As shown in FIG. 2, when the wire rope 40 is wound up until the stopper 41 passes through the wide portion 17 b of the wire feeding window 17 and comes into contact with the main body portion 52 of the wire passing member 50, the spiral spring 30 is wound. Since the pulling force due to the above acts on the wire passing member 50 via the wire rope 40 and the stopper 41, the main body 52 abuts against the inner wall surface of the end of the wide portion 17 b on the narrow portion 17 a side of the wire feeding window 17. Is housed in the inner space of the flange portion 17c.
[0021]
In this state, even if a vertical load due to the weight of the tool connected to the connection tool 60 acts on the end of the wire rope 40, the stopper 41 is in a state of being accommodated in the inner space of the flange portion 17c. Cannot move downward through the narrow portion 17a in the wire feed window 17, and horizontal movement to the left in FIG. 2 is also prevented by the flange portion 17c, whereby the wire rope in the depression angle direction or the vertical direction is prevented. 40 withdrawals are blocked. For this reason, the operator can carry the tool in a suspended state on the tool drop prevention tool without storing the tool in the tool storage bag (see reference numeral 7 in FIG. 7) attached to the waist belt 6. It functions effectively as a temporary holder when the user wants to release his / her hand from the tool for a short time during the work.
[0022]
When the tool is used for construction, the wire rope 40 is pulled out from the case 10 as the operator holds the tool in his / her hand. The pulling direction of the wire rope 40 at this time is Usually, the elevation direction is as shown in FIG. For this reason, the stopper 41 moves from the inner space of the flange portion 17c to the outside of the case 10 through the wide portion 17b of the wire feeding window 17, so that the wire rope 40 is easily pulled out. Further, after the stopper 41 has once moved to the outside of the case 10 in this way, the wire rope 40 can pass through the narrow portion 17a in the wire feeding window 17, so that as shown in FIG. It can also be pulled out in the vertical direction.
[0023]
In using the tool, the wire rope 40 drawn out from the case 10 has a short pull-out length, so that the spiral spring 30 is wound around the spring core 18 by the rotation of the drum 20. It is performed only by the spring portion, and only a weak tensile force is applied to the tool, so that the operation using the tool is not hindered.
[0024]
Here, the pulling direction of the wire rope 40 from the case 10 changes within a certain range depending on the movement of the hand holding the tool, and accordingly, the wire passing member 50 extends along the holding groove 15. The wire rope 40 in the wire passing member 50 is moved up and down in the circumferential direction, and the feeding position of the wire rope 40 from the drum 20 is displaced up and down in the wire lead-out portion 16a formed on the arcuate wall surface 16 of the case 10. The main body 52 which is 40 passages is angularly displaced up and down in the wide portion 17 b in the wire feed window 17. For this reason, there is no increase in resistance when the wire rope 40 is pulled out or retracted due to a change in elevation in the pulling direction.
[0025]
Further, when the operator drops the tool while working at a high place, when the wire rope 40 is pulled out from the case 10 attached to the waist belt 6 of the operator by dropping the tool, the spiral spring 30 is pulled. First, a low spring portion consisting only of the first elastic plate 31 is wound, and the increase in the falling speed is suppressed to some extent by the stored energy. Further, when the pull-out length of the wire rope 40 becomes a predetermined length (for example, about 1200 mm) or more, a high spring portion where the first and second elastic plates 31 and 32 are overlapped is wound, and at this time, the first elasticity Load transmission from the plate 31 to the plurality of second elastic plates 32 is sequentially performed, and frictional damping is generated by sliding the surfaces of the plates to each other. Stop.
[0026]
After the tool has dropped to a certain height and stopped, the drum 20 rotates in the direction of winding the wire rope 40, that is, the counterclockwise direction in FIG. The tool starts to rise, but even in this process, the kinetic energy is attenuated by the sliding of the first elastic plate 31 and the plurality of second elastic plates 32, so that the rising speed of the tool is remarkably relieved and abrupt. The danger due to the bounding action is effectively avoided. As a result, the tool moves up and stops with the winding of the wire rope 40 with almost no repeated vertical movement of the tool.
[0027]
After the work using the tool is completed, if the tool is returned from the working state to the case 10 side, the wire rope 40 has a spherical stopper 41 provided in the vicinity of the tip of the wire rope 40 so that the wire feed window 17 of the case 10 has a wide width. It passes through the portion 17b and enters the inner space of the flange portion 17c formed at the end portion on the narrow flange portion 17a side, abuts against the main body portion 52 of the wire passing member 50, and the main body portion 52 is wide in the wire feeding window 17. The portion 17b is wound around the reel portion 22 of the drum 20 by the urging force of the spiral spring 30 until it comes into contact with the inner wall surface of the narrow portion 17a side and reaches the state shown in FIG.
[0028]
In the first embodiment described above, only one set of the wire rope 40 for attaching the tool and the drum 20 for winding up the tool is provided. Can be attached. FIG. 6 shows, as an example, a second embodiment including two sets of a wire rope 40 and a drum 20 that winds the wire rope 40, a spiral spring 30, a wire threading member 50, and the like.
[0029]
That is, in this tool fall prevention tool, the case 10 includes case division bodies 10A and 10B similar to those shown in FIGS. 1 to 3 described above, and an intermediate case member 10C sandwiched therebetween. It has a three-division structure in the thickness direction that is releasably coupled by a plurality of screws 12, and is between one case divided body 10A and the intermediate case member 10C and between the other case divided body 10B and the intermediate case member 10C. In addition, the drum 20 and the wire threading member 50 are held by the same structure as in FIG. In addition, a spring core (not shown) protruding from the case division body 10 </ b> A is formed to have a length penetrating the shaft hole 20 a of both the drums 20.
[0030]
A spiral spring (not shown) housed in a spiral spring housing portion in each drum 20 has a non-binding end portion of each long first elastic plate locked to a common spring core and a plurality of elastic plates. The binding end is locked to each drum 20. The individual configurations of other parts are basically the same as those of the first embodiment, and therefore the effects of these mechanisms are the same as those of the first embodiment.
[0031]
According to 2nd Embodiment provided with the said structure, the wire ropes 40 and 40 pulled out from each drum 20 and 20 are between one case division body 10A and intermediate | middle case member 10C, and the other case division body 10B. And the intermediate case member 10C, the wire lead-out portion 16a formed between the intermediate case member 10C, the wire passage hole 52a of the wire passage member 50, and between the one case divided body 10A and the intermediate case member 10C and between the other case divided body 10B and the intermediate case member 10B. It is pulled out to the outside of the case 10 through the wire feed window 17 formed between the case members 10C, and a tool can be connected to the connecting tool 60 at the tip.
[0032]
In the present invention, the stopper 41 does not necessarily have a spherical shape as illustrated, and may have another shape. Further, the wire rope 40 may be other string-like, thread-like or band-like bodies.
[0033]
【The invention's effect】
According to the tool fall prevention tool according to the invention of claim 1, the feeding guide member that guides the string-like, thread-like or belt-like body fed from the drum is movable in the circumferential direction within the feeding window of the case, As the pull-out angle of the thread-like or band-like body changes depending on the movement of the hand holding the tool, the feeding position by the feeding guide member moves in the circumferential direction. No increase in resistance. Therefore, since the string-like, thread-like or belt-like body is smoothly drawn out or retracted, good workability can be ensured, and the string-like, thread-like or belt-like body or the feeding guide member can be prevented from being damaged by wear. .
[0034]
According to the tool fall prevention tool according to the invention of claim 2, in the configuration of claim 1, the feeding window of the case has a narrow part and a wide part, and the lead-out end part of the string-like, thread-like or band-like body or the vicinity thereof Further, since the stopper that is not allowed to pass through the narrow part and is capable of passing through the wide part is provided, the string-like, thread-like, or belt-like body is narrowed in the state where the stopper is accommodated in the feeding window. For example, when a tool attached to a string, thread or belt can be suspended from the case, and as a result, it is desired to release the hand from the tool for a while during the operation. In addition, since it functions as a temporary holder, it is possible to improve the workability by reducing the trouble of taking out and storing the tool.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a front side of a preferred first embodiment of a tool fall prevention tool according to the present invention.
FIG. 2 is an explanatory diagram of an internal structure of the tool fall prevention tool.
FIG. 3 is a rear view of the tool fall prevention tool.
FIG. 4 is an explanatory diagram of an internal structure showing a state in which a wire rope is pulled out in the elevation angle direction from the tool drop prevention tool.
FIG. 5 is an internal structure explanatory view showing a state in which a wire rope is pulled out from the tool fall prevention tool in a depression direction.
FIG. 6 is an exploded perspective view showing a tool fall prevention tool including two sets of a wire rope and a drum for winding the wire rope as a second embodiment of the tool fall prevention tool according to the present invention.
FIG. 7 is an explanatory diagram showing a situation when an operator drops a tool attached to a tool fall prevention tool according to a conventional technique.
FIG. 8 is an explanatory view showing a state in which a string-like body is pulled out in a conventional tool fall prevention tool.
[Explanation of symbols]
10 Case 17 Wire feeding window (feeding window)
17a Narrow part 17b Wide part 20 Drum 30 Spiral spring 40 Wire rope (string, thread or strip)
41 Stopper 50 Wire passing member (feeding guide member)
60 Tie

Claims (2)

A drum (20) rotatably housed in a case (10);
A string-like, thread-like or belt-like shape that can be wound around the drum (20) and fed out from the feeding window (17) of the case (10) through the feeding guide member (50) to attach a tool to the tip. Body (40),
A spiral spring (30) disposed in the drum (20) and biasing the drum (20) in the winding direction of the string-like, thread-like or strip-like body (40);
The feeding guide member (50) can be moved in the circumferential direction by loosely fitting in a holding groove (15) formed in an arc shape concentric with the drum (20) on the inner surface of the case (10). It has a guided arc-shaped slide guide part (51), and the inside of the feeding window (17) along the holding groove (15) according to the pulling angle of the string-like, thread-like or band-like body (40) A tool fall prevention tool provided in the case (10) so as to be movable in the circumferential direction. The feeding window (17) is composed of a narrow portion (17a) extending on the lower surface when the case (10) is mounted and a wide portion (17b) extending in the vertical direction,
A stopper (41) that cannot pass through the narrow portion (17a) and can pass through the wide portion (17b) is provided at or near the leading end of the string-like, thread-like or band-like body (40). 2. The tool fall prevention tool according to claim 1, wherein

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