JPH0810345A - Main safety rope stretching device - Google Patents

Abstract

PURPOSE:To prevent a worker from being tightened by the safety belt worn by the worker himself, in such a case where the worker slips out from a footboard in a high-place work, by reducing the large falling impact being exerted to the worker. CONSTITUTION:In a main safety rope stretching device provided with a fixing- side belt 1, an adjusting-side belt 2, and a belt tensioner 3, a belt is foldedly overlapped at least on one side of the respective belts 1, 2, and the overlapped part is mutually sewn so as to form a shock absorber 5 for absorbing a shock in which a sewn part 50 is broken by the tension of the respective belts 1, 2 exceeding a prescribed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a master rope tensioning device used to hold a master rope in a tensioned state for preventing a worker from falling in a construction site at a high place.

[0002]

2. Description of the Related Art Conventionally, a tension device for a master rope has been disclosed in Japanese Utility Model Laid-Open No. 62-54764, for example.
A rope using a rope as the master rope, or an actual flat 2
As disclosed in Japanese Patent Publication No. 143958, one using a belt is known. Further, a tension device for a master rope using a belt is provided with a hooking tool for locking these belts to a structural column or the like at each end of the fixed side belt and the adjustment side belt, and the adjustment belt is provided between the belts. It is configured with a tensioner that winds up the side belts to tension them.

When working at a construction site at a high place, the ends of the belts are locked to the structural columns by the hooks, and the adjusting belt is wound up by the tensioner. Are tensioned between the structural columns. Therefore, by locking the life rope attached to the safety belt worn by the worker on the master rope composed of the above-mentioned belts to perform the work, even when the worker steps on the tread, the life rope and the master rope are separated from each other. The operator can be prevented from falling from a high place, and the safety of the operator can be secured.

[0004]

By the way, in both the tensioning device using the rope and the tensioning device using the belt, when the worker steps on the tread plate at the time of working at a high place, this worker The weight due to the weight of the parent rope is received by the parent rope via the life rope, and it is possible to prevent the parent rope from falling from a high place.However, when falling, the parent rope bends due to the drop load, and the fall impact is mitigated. However, since the main rope is stretched with a predetermined tension, a large drop impact is applied to the worker.

An object of the present invention is to alleviate the effect of a large drop impact on the worker side when the worker steps on the footboard during work at a high place, and a safety belt worn by the worker. It is an object of the present invention to provide a tensioning device for a master rope that can prevent the worker from being bitten by an operator or being unnecessarily tightened.

[0006]

In order to achieve the above object, a tension device for a master rope according to claim 1 is provided with a fixed belt 1.
And a belt tensioner 3 that locks the adjustment side belt 2 and the fixed side belt 1 on one side, and winds the adjustment side belt 2 on the other side to tension the fixed side belt 1 and the adjustment side belt 2. , A hooking tool 1 provided at the free ends of the belts 1 and 2
A belt tensioning device for a rope using a belt composed of 1 and 12, wherein the belt is folded and overlapped on at least one of the belts 1 and 2, and the overlapped belts are sewn together. The shock absorber 5 is provided to absorb the shock by breaking the sewn portion 50 due to the tension of 1 or 2 or more.

The tension device for a master rope according to claim 2 is
A loop-shaped locking portion 10 is provided at the free end portion of the belt to overlap and sew the free end of the belt, and the locking portion 10 is locked to a hooking tool. While the belts are folded back and overlapped, the overlapped belts are sewn together to form the shock absorber 5.

Further, the master rope tensioning device according to claim 3 is provided with a plurality of polymerized layers in which the belt is folded back and overlapped with each other, and the first layer 51 of the polymerized layers is formed by the first sewing thread 52. The second layer 53 is sewn with the second sewing thread 54 at a sewing strength different from the sewing strength of the first sewing thread 52.

Further, the tensioning device for the main rope according to claim 4 is:
The belt 2 is folded back and overlapped with the winding side end of the adjusting side belt 2 wound around the winding shaft 32 of the belt tensioner 3, and the folded back portion 21 is sewn to the winding shaft 3 to be wound.
The retaining portion 22 for preventing the detachment of the slit 2a from the slit 32a in 2 is provided.

[0010]

According to the master rope tensioning device of the first aspect, at the time of working at a high place, the fixed side and adjustment side belts 1 and 2 are wound around a structural pillar or the like, and the belts 1 and 2 are respectively wound. The hooks 11 and 12 attached to the free ends of the
The belts 1 and 2 are hooked on the winding start end side of
The fixed side belt 1
The adjustment-side belt 2 is wound up via the tensioner 3 provided in the above to tension each of the belts 1 and 2 in a tension state between the structural columns, and after performing such tensioning work, Various kinds of work are performed by locking a hook of a life rope attached to a safety belt worn by an operator to the master rope composed of the belts 1 and 2. Then, when the worker steps off the tread and falls at the time of working at a high place, the falling load is received by the belts 1 and 2 via the lifeline, so that the worker falls from a high place. Moreover, at this time, the shock absorber 5 is provided on at least one side of each of the belts 1 and 2, and the shock absorber 5 folds back at least one side of each of the belts 1 and 2. The belts are overlapped and sewn to each other, and when the belts 1 and 2 are tensioned by a predetermined amount or more, the sewn portions 50 of the belts are broken to absorb a shock. From this, when the operator steps on the tread plate and a load greater than a predetermined value is applied to each of the belts 1 and 2 due to the fall, the sewn portion 50 is broken to absorb the load. Therefore, it is possible to alleviate that a large drop impact acts on the worker side through the lifeline due to the breakage of the sewn portion 50, and the safety belt worn by the worker is applied to the worker. It is possible to prevent it from biting into and being unnecessarily tightened, and moreover, since the shock absorber 5 is formed by the sewn portion 50 provided on at least one side of each of the belts 1 and 2. The shock absorber 5 can be easily formed by using a part of each of the belts 1 and 2.

According to another aspect of the present invention, in the tensioning device for a master rope, a loop-shaped locking portion 10 is provided at the free end portion of the belt so that the free end of the belt is overlapped and sewn. While the portion 10 is locked to the hooking tool and the belt in the loop-shaped locking portion 10 is folded back and overlapped, the overlapped belts are sewn together to form the shock absorber 5, so that the belt is When a shock is given,
This shock can be reliably absorbed and relaxed on the free end side of the belt by the shock absorber 5 provided in the loop-shaped locking portion 10, and the shock absorber 5 is provided in the loop-shaped locking portion 10. Therefore, in the case where the worker performs work while moving on the tread, when the hook of the lifeline attached to the worker is moved along the master line, the shock absorber 5 is The hook can be smoothly moved and the worker can be smoothly moved without hindering the movement of the hook.

Further, according to the tensioning device of the main rope of the present invention, the belt is provided with a plurality of polymer layers which are folded back and overlapped with each other, and the first layer 51 of the polymer layers is the first sewing thread. The second shock absorber 5 is sewn at 52, and the second layer 53 is sewn with the second sewing thread 54 at a sewing strength different from that by the first sewing thread 52 to form the shock absorber 5. Therefore, when the shock absorber 5 receives a shock due to a worker stepping on the tread plate, the shock is gradually absorbed while sequentially breaking the first layer 51 and the second layer 53 from the one having the weakest sewing strength. It is possible to alleviate the impact of a large drop impact on the operator side, and the first and second layers 51 and 53 are respectively provided with the first and second sewing threads 52. , 54 with different sewing strength Because, each of these sewing thread 52,5
Each layer 5 by selecting the thickness and type of 4 or the number of stitches
By changing the sewing strength of 1, 53, the shock absorbing characteristics of the shock absorber 5 can be freely changed, and the tensioning device can be used for various purposes and can be versatile. Of.

According to another aspect of the present invention, in the main rope tensioning device, the belt 2 is folded back to the winding side end of the adjusting side belt 2 which is wound around the winding shaft 32 of the belt tensioning machine 3. And the folded-back portion 21 is sewn onto the take-up shaft 32 so as to prevent the detachment of the winding shaft 32 from the slit 32a. It is possible to prevent the take-up side end portion from coming out of the slit 32a of the take-up shaft 32 and contribute to the improvement of workability, that is, for example, the adjustment-side belt 2 and the fixed-side belt 1 In the case where the tension belt is tensioned, and the adjustment length of the adjustment belt 2 with respect to the fixed belt 1 is long and the winding operation of the tensioner 3 needs to be repeated many times, the adjustment belt Two
Of the tensioner 3 by pulling the winding-side end of the tensioner 3 outward from the slit 32a and winding the belt 2 in a double superposed state on the winding shaft 32 of the tensioner 3.
The number of windings of the belt is reduced and the work of stretching the belts 1 and 2 is performed labor-savingly. In such a case, in order to double-ply the adjustment side belt 2, the belt 2 is When the belt 2 is pulled out from the slit 32a to the outside, the belt 2 may come out of the slit 32a, and once the belt 2 comes out of the slit 32a, the belt 2 may be inserted into the slit 32a. Although the troublesome work and the predetermined time are required, by providing the belt 2 with the retaining portion 22, it is possible to reliably prevent the belt 2 from coming out from the slit 32a of the winding shaft 32. It is possible to contribute to the improvement of workability.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A master rope tensioning device according to the present invention will be described below with reference to embodiments of the drawings. The master rope tensioning device shown in FIG. 1 has a fixed belt 1 and an adjustment belt 2 as the master rope A.
And the hooks 11 and 12 such as hooks are attached to the free ends of the respective belts 1.2, and the adjustment side belt 2 is wound around the other end of the fixed side belt 1, A belt tensioner 3 for tensioning the belts 1 and 2 is attached.

When performing various works at a construction site at a high place, first, the fixed side belt 1 and the adjustment side belt 1,
2 is wound around the structural columns H1 and H2, and the hooks 11 and 12 attached to the free ends of the belts 1 and 2 are hooked on the winding start ends of the belts 1 and 2, The belts 1 and 2 are locked to the structural columns H1 and H2, respectively, and the adjustment-side belt 2 is wound up via the tensioner 3 attached to the fixed-side belt 1, so that 2 is tensioned between the structural columns H1 and H2, and after the tensioning work is performed, the belts 1 and 2 are
That is, the hook 41 of the lifeline 4 attached to the worker A on the master line A
Is engaged, and the worker performs various works while walking on the step board B suspended between the structural columns H1 and H2.

Therefore, the shock absorber 5 is provided on at least one side of the fixed side and the adjustment side belts 1 and 2, and in the embodiment shown in the figure, the shock absorber 5 is provided only on the fixed side belt 1. There is. And
The shock absorber 5 is composed of a sewn portion 50 in which an intermediate portion in the lengthwise direction of the fixed side belt 1 is folded back and overlapped with each other, and the overlapped portions are sewn to each other. When it is tense, the sewing part 5
By breaking 0, the shock applied to each of the belts 1 and 2 is absorbed and relieved.

More specifically, the sewn portion 50 that constitutes the shock absorber 5 is folded back so that the intermediate portion in the lengthwise direction of the stationary belt 1 is vertically overlapped as shown in FIG. A first layer 51 is formed, and the first layer 51 is sewn with a first sewing thread 52 shown by a solid line in the figure, and the belt 1 extending from the first layer 51 overlaps with the upper side of the first layer 51. As described above, the upper side of the first layer 51 and the folded belt 1 form a second layer 53 independent of the first layer 51.
The layer 53 is sewn with a second sewing thread 54 shown by a dotted line in the figure, and the belt 1 extending from the second layer 53 is folded back so as to overlap with the upper side of the second layer 53, and the second The upper side of the layer 53 and the folded back belt 1 form a third layer 55 independent of the second layer 53, and the third layer 55 is a third sewing thread shown by a chain line in FIG. The belt 1 sewn at 56, and further, the belt 1 extending from the third layer 55 is folded back so as to overlap with the upper side of the third layer 55, and the belt 1 folded back with the upper side of the third layer 55. A fourth layer 57 independent of the third layer 55 is formed with the fourth layer 57, and the fourth layer 57 is sewn with a fourth sewing thread 58 shown by a two-dot chain line in FIG. Sewing thread 52,54,5
6, 58, the first to fourth layers 51, 53, 55, 5
7 differently, for example, by arbitrarily selecting the thickness and type of the first to fourth sewing threads, the number of stitches, etc., the sewing strength of the first to fourth layers respectively. When the operator steps on the footboard B and falls, and when a load of a predetermined amount or more is applied to the stationary belt 1, the layers are sewn in order of weakness. By absorbing and relaxing the load while rupturing it, it is possible to reduce the impact of a large drop impact on the worker side through the lifeline 4, and by making the sewing strength of each layer different. The shock absorbing characteristics of the shock absorber 5 can be freely changed.

The first to fourth layers 51, 53, 55, 57
Is not only sewn with the first to fourth sewing threads 52, 54, 56, 58, but is also sewn between the first to fourth layers with another sewing thread having different strength, For example, it is also possible to straddle the upper and lower parts of each of these layers or to sew the facing parts of each layer with different sewing threads having different strengths. In such a case, the shock absorber 5 The degree of freedom when changing the absorption characteristics can be further increased. In addition, in the above embodiments, the first to fourth layers 51, which are formed by folding back the fixed side belt 1 in a superposed manner,
The shock absorber 5 is formed by laminating four layers 53, 55 and 57, but the shock absorber 5 may be arranged in parallel in the length direction of the belt 1 or 2.
In addition to a multi-layer structure, the first and second layers 51 and 53 may be formed of only two layers. The shock absorber 5 may be provided on the adjustment side belt 2 side, or may be provided on both the adjustment side belt 2 and the fixed side belt 1. Further, the shock absorber 5 is provided on each of the belts. The belts 1 and 2 may be independently formed by, for example, overlapping and sewing the belts 1 and 2 at a plurality of positions, and even in such a case, from the operator's footboard B, It is possible to absorb the shock applied to the belts 1 and 2 at the time of the drop, and absorb and absorb the drop shock applied to the worker side.

On the free end side of the fixed side belt 1,
As shown in FIG. 3, the free end side of the belt 1 is folded back in a loop shape, and the folded back end portion is overlapped with the belt 1 and sewn to form the loop-shaped locking portion 10,
In the case described above, the hooking tool 11 is attached to the locking portion 10, the part of the belt 1 forming the loop-shaped locking portion 10 is folded back and overlapped, and the overlapped portion is sewn. It is also possible to form a sewn portion 50 similar to that and use this sewn portion 50 as the shock absorber 5. The loop-shaped locking portion 10 is formed on the free end side of the adjustment-side belt 2 so that the hooking tool 12 on the belt 2 side can be attached to the locking portion 10. A part of the belt 2 forming the portion 10 may be folded back and overlapped, and the overlapped portion may be sewn to form the shock absorber 5 by providing the sewn portion 50. .

Next, the operation of the above configuration will be described. When an operator steps on the footboard B and falls when working at a high place, the falling load is applied from the belts 1 and 2 via the lifeline 4 attached to the safety belt C worn by the operator. Since it is received by the master rope A, it is possible to prevent the worker from falling from a high place. At this time, on at least one side of the fixed-side belt 1 and the adjustment-side belt 2, the shock absorber 5 including the sewn portion 50 in which a part of each of the belts 1 and 2 is folded back and overlapped is provided. Therefore, when the operator steps on the footboard B or a load more than a predetermined value is applied to the belts 1 and 2 due to the fall, the sewing part 50 is broken to load the load. Therefore, it is possible to absorb a large drop impact on the worker side through the lifeline 4 due to the breakage of the sewn portion 50, and the worker tightens the safety belt C. Moreover, since the shock absorber 5 is formed by the sewn portion 50 in which a part of each of the belts 1 and 2 is folded back and overlapped with each other, each of the belts can be prevented. It can also be utilized a portion of the 2 to easily form the shock absorber 5.

Moreover, the shock absorber 5 is folded back so that the longitudinal intermediate portions of the belts 1 and 2 are vertically overlapped with each other, and the first to fourth layers 51, 53, 55 and 57 are formed.
And each of these layers is connected to the first to fourth sewing threads 52, 5
4, 56 and 58 are sewn with different sewing strengths, the operator may step on the footboard B, and when the operator drops the footboard B, a load of a predetermined amount or more is applied to the belts 1 and 2. When this is done, the shock can be gradually absorbed and relaxed while sequentially breaking each of the layers from the one having the weakest sewing strength, and the effect of a large drop impact on the operator side can be further mitigated, and Since the layers are sewn with different sewing strengths through the sewing threads, the shock absorbing characteristics of the shock absorber 5 can be changed by changing the sewing strength of the layers due to the sewing threads. Can be freely changed, and the tension device can be used for various purposes and can be highly versatile.

Further, in forming the shock absorber 5, as shown in the embodiment of FIG. 3, a loop-shaped locking portion 10 is provided on the free end side of the fixed and adjustment side belts 1 and 2.
The hooks 11 and 12 are attached to the locking portion 10, and the belts 1 and 2 forming the loop-shaped locking portion 10 are partially overlapped and sewn together to sew. When the fastening portion 50 is formed and the sewing portion 50 is used as the shock absorber 5, the belts 1, 2
When a shock is applied to the belt, the shock absorber 5 can surely absorb and absorb the shock on the free end side of the belts 1 and 2, and the shock absorber 5 is fixed to the loop-shaped locking portion 10. By providing, when the worker works while moving on the footboard B, when the hook 41 of the lifeline 4 attached to the worker is moved along the belts 1 and 2, ,
The shock absorber 5 smoothly moves the hook 41 without hindering the movement of the hook 41,
The worker can be moved smoothly. At this time, the hook 41 of the lifeline 4 is formed to have a size capable of overcoming the tensioner 3, and the shock absorber 5 is also formed to have a size capable of overcoming the hook 41.

The belt tensioner 3 used in the master rope tensioning device has a grip portion 31 on the upper side and a bifurcated shape on the lower side, as is clear from FIGS. 4 to 9. A handle 30 having a V-shaped frame shape is formed, and a slit 32a for inserting the free end side of the adjusting side belt 2 is provided between the open ends of the handle 30, and the belt 2 is inserted into the slit 32a. The take-up shaft 32, which is wound in a state, is rotatably supported, the ratchet wheel 33 is fixed to the take-up shaft 32, and the handle 30 has a feed claw 34 that can be engaged with and disengaged from the ratchet wheel 33. A lever 35 is attached, and the feed claw 34 of the release lever 35 and the ratchet wheel 33 are used to operate the handle 3
The inner frame 3 in which the fixed belt 1 is fixed to the winding shaft 32 while constituting a transmission mechanism 36 from 0 to the winding shaft 32.
7 is rotatably supported, and a reverse rotation preventing claw 38 that meshes with the ratchet wheel 33 and blocks rotation of the winding shaft 32 in the rewinding direction is attached to the inner frame 37. With the ratchet wheel 33,
A reverse rotation preventing mechanism 39 is formed to release power transmission by the transmission mechanism 36 when the handle 30 is operated in the rewinding direction, and the handle 30 is folded toward the inner frame 37 side around the winding shaft 32. Configured as possible.

Further, the release lever 35 is slidably supported in guide grooves 30a formed on both side wall surfaces of the handle 30, and the release lever 35 is provided between the lever 35 and the handle 30. The ratchet wheel 33 is constantly urged to engage with the ratchet wheel 33 via a provided spring 6, and the lever 35 is pulled up against the spring 6 to release the engagement with the ratchet wheel 33. are doing.

The reverse rotation preventing claws 38 have guide grooves 37 formed on both side walls of the inner frame 37 on both sides in the width direction thereof.
Each of the restriction portions 38a is inserted into and held in a and has its both outer end portions projected outward, and each restriction portion 38a is slidable along each of the guide grooves 37a. The spring 7 is interposed between the reverse rotation preventing pawl 38 and the reverse rotation preventing pawl 38, and the spring 7 constantly biases the tip end side of the reverse rotation preventing pawl 38 to engage with the ratchet wheel 33. Further, the reverse rotation preventing claw 38 is provided on the cam portion 3 provided on the open end side of the handle 30 when the handle 30 is rotated by about 180 degrees with respect to the inner frame 37.
0b, the ratchet wheel 33 is disengaged from the reverse rotation preventing pawl 38 and the feed pawl 34 together.

In the case where the fixed side belt 1 and the adjusting side belt 2 are tensioned at the time of working at a high place,
When the length of the adjusting side belt 2 with respect to the fixed side belt 1 is adjusted, the release lever 35 is pulled up against the spring 6, and the feed claw 34 and the ratchet wheel 3 are pulled.
3, the handle 30 is rotated by approximately 180 degrees with respect to the inner frame 37 to release the reverse rotation preventing claw 3.
By mounting 8 on the cam portion 30b,
The ratchet wheel 33 is disengaged from the feed claw 34 and the reverse rotation prevention claw 38, and the release shaft 32 can be freely rotated by releasing them. The winding shaft 32 is pulled out from the slit 32a to the outside.

When the fixed side belt 1 and the adjustment side belt 2 are to be tensioned, the feed claw 34 is repetitively operated by repeating the vertical swing operation of the handle 30.
The ratchet wheel 33 is rotated via the winding shaft 32, the winding shaft 32 is rotated in accordance with the rotation of the ratchet wheel 33, and the adjustment side belt 2 is wound on the winding shaft 32. The tension between the belt 2 and the fixed side belt 1 is performed. Further, after the belts 2 and 3 are tensioned, the handle 30 is rotated in a folding shape with respect to the inner frame 37 while the reverse rotation preventing claw 38 is engaged with the ratchet wheel 33. The ratchet wheel 33 is prevented from rotating freely, and the adjustment side belt 2 wound around the winding shaft 32 is prevented from being loosened.

Further, in the embodiments shown in the respective drawings, the reverse rotation preventing claws projecting from the respective guide grooves 37a formed in the inner frame 37 on both side walls of the handle 30 facing the inner frame 37. Engagement portions 30c that engage with both outer end portions of each regulation portion 38a of the reference numeral 38 are respectively formed, and the handle 30 is rotated in a folded manner with respect to the inner frame 37 as shown in FIG. At this time, the engagement portions 30c are engaged with both outer end portions of the regulation portions 38a while the reverse rotation preventing claws 38 are still engaged with the ratchet wheel 33. In doing so, each of the engaging portions 3
0c and the respective restricting portions 38a engage with each other to prevent the reverse rotation preventing claw 38 from freely retracting, that is,
When the ratchet wheel 33 is engaged with the reverse rotation preventing pawl 38, the ratchet wheel 33 can be prevented from moving backward, and the ratchet wheel 33 is rotated. Can be prevented from loosening without permission, and therefore, the safety can be improved.

Further, in the tensioner 3 configured as described above, as shown in FIG. 6, at the end side of the adjustment side belt 2 inserted into the slit 32a of the winding shaft 32, the belt is provided. The two may be folded back in a loop shape and overlapped, and the folded-back portion 21 may be sewn to provide the retaining portion 22 for preventing the winding shaft 32 from being separated from the slit 32a.

In the case of the above structure, the retaining portion 2
The end of the adjusting-side belt 2 is
It is possible to prevent the slit 32a from coming out to the outside and contribute to the improvement of workability, that is,
For example, in the case where the adjustment side belt 2 and the fixed side belt 1 are stretched in a tension state, the adjustment length of the adjustment side belt 2 with respect to the fixed side belt 1 is long and the winding operation of the tensioner 3 is performed. When it is necessary to repeat the number of times, the winding-side end of the adjustment-side belt 2 is pulled out from the slit 32a to the outside, and the winding-up of the tensioner 3 is performed with the belt 2 being superposed. By winding the belt around the shaft 32, the number of windings of the tensioner 3 can be reduced and the tensioning work of the belts 1 and 2 can be performed labor-savingly. When the belt 2 is pulled outward from the slit 32a so as to be superposed in a double manner, the belt 2 may come out of the slit 32a. In particular, once the belt 2 comes out of the slit 32a, slit Although it takes a lot of labor and a predetermined time to reinsert the belt 2 into the belt 2a, the belt 2 is provided with the retaining portion 22 so that the belt 2 can be rewound. It is possible to reliably prevent the slit 32a from coming out to the outside, which can contribute to the improvement of workability.

[0031]

As described above, according to the first aspect of the present invention, the fixed side belt 1, the adjusting side belt 2 and the fixed side belt 1 are locked on one side and the adjusting side is fixed on the other side. A belt tensioner 3 that winds up the side belt 2 to tension the fixed side belt 1 and the adjustment side belt 2, and the belts 1 and 2.
In a tension device for a master rope using a belt composed of hooks 11 and 12 provided at the free ends of the two belts, the belts are folded back and overlapped on at least one side of the belts 1 and 2 and the overlapped belts. Since the shock absorbers 5 are sewn to each other and the sewn portion 50 is broken by a certain tension of the belts 1 and 2 and absorbs a shock, the worker steps off the tread and falls when working at a high place. In such a case, the falling load can be received by the belts 1 and 2 via the lifeline, so that the worker can be prevented from falling from a high place, and at the same time, the belts 1 and 2 can be prevented. The shock absorber 5 is provided on at least one side of the belt 2, and the shock absorber 5 folds and overlaps at least one side of each of the belts 1 and 2, and When the belts 1 and 2 are sewn together and the belts 1 and 2 are tensioned by a predetermined amount or more, the sewn portions 50 of the belts are ruptured so as to absorb the shock. When the load is applied to each of the belts 1 and 2 due to the stepping off, or the belt is dropped, the sewn portion 50 can be broken to absorb and relax the load. It is possible to alleviate a large drop impact on the worker side through the lifeline due to the breakage of the sewn portion 50, and prevent the worker from being tightened by the safety belt worn by the worker. And on top of that, the shock absorber 5
Since the sewn portion 50 is provided on at least one side of each of the belts 1 and 2, the shock absorber 5 can be easily formed by using a part of each of the belts 1 and 2. Of.

According to another aspect of the present invention, in the master rope tensioning device, a loop-shaped locking portion 10 is provided at the free end portion of the belt so that the free end of the belt is overlapped and sewn. While the belt 10 in the loop-shaped locking portion 10 is folded back and overlapped with each other, the overlapped belts are sewn together to form the shock absorber 5, so that the belt is shocked. When a shock is applied, this shock can be reliably and satisfactorily absorbed and absorbed on the free end side of the belt by the shock absorber 5 provided in the loop-shaped locking portion 10. Moreover, the shock absorber 5 is provided with the loop. Since it is provided in the locking portion 10, the hook of a lifeline attached to the worker is attached to the master rope when the worker works while moving on the footboard. When moved Te, without the shock absorber 5 to inhibit the movement of such a hook, carried out smoothly the movement of such the hook, it can be moved in the operator smoothly.

Further, according to the tensioning device of the main rope of the present invention, the belt is provided with a plurality of superposed layers which are folded back and overlapped with each other, and the first layer 51 of the superposed layers is the first sewing thread. The second shock absorber 5 is sewn at 52, and the second layer 53 is sewn with the second sewing thread 54 at a sewing strength different from that by the first sewing thread 52 to form the shock absorber 5. Therefore, when the shock absorber 5 receives a shock due to a worker stepping on the tread plate, the shock is gradually absorbed while sequentially breaking the first layer 51 and the second layer 53 from the one having the weakest sewing strength. It is possible to alleviate the impact of a large drop impact on the operator side, and the first and second layers 51 and 53 are respectively provided with the first and second sewing threads 52. , 54 with different sewing strength Because, each of these sewing thread 52,5
Each layer 5 by selecting the thickness and type of 4 or the number of stitches
By changing the sewing strength of 1, 53, the shock absorbing characteristics of the shock absorber 5 can be freely changed, and the tensioning device can be used for various purposes and can be versatile. Of.

Further, according to the master rope tensioning device of the fourth aspect, the belt 2 is folded back to the winding side end of the adjusting side belt 2 which is wound around the winding shaft 32 of the belt tensioning machine 3. Since the folded-back portions 21 are overlapped and sewn together and the retaining portions 22 for preventing the take-up shaft 32 from being separated from the slits 32a are provided, the winding of the adjustment-side belt 2 is performed via the retaining portions 22. It is possible to prevent the take-up side end portion from coming out of the slit 32a of the winding shaft 32 to contribute to the improvement of workability, that is, for example, the adjustment side belt 2 and the fixed side belt 1 In the case where the tension belt is tensioned, and the adjustment length of the adjustment belt 2 with respect to the fixed belt 1 is long and the winding operation of the tensioner 3 needs to be repeated many times, the adjustment belt The end of the winding side of 2 Drawer from Tsu door 32a to the outer side,
The tensioner 3 in a state where the belt 2 is doubly overlapped.
By winding the belt around the winding shaft 32, the number of times the tensioner 3 is wound can be reduced and the work of stretching the belts 1 and 2 can be performed labor-savingly. When the belt 2 is pulled out from the slit 32a to the outside so that the belt 2 is superposed, the slit 32
The belt 2 may come out of the a.
Once it comes out of the slit 32a, it takes a troublesome work and a predetermined time to insert the belt 2 into the slit 32a, while the belt 2 is provided with the retaining portion 22. The belt 2 can be reliably prevented from coming out of the slit 32a of the winding shaft 32 to the outside, which can contribute to the improvement of workability.

[Brief description of drawings]

FIG. 1 is a schematic view showing an overall structure of a master rope tensioning device according to the present invention.

FIG. 2 is an enlarged side view of a shock absorber provided in the same rope tensioning device.

FIG. 3 is a side view showing another mounting example of the shock absorber.

FIG. 4 is a perspective view of a tensioner used in the same rope tensioning device.

FIG. 5 is a side view thereof.

FIG. 6 is a side view showing an open state of the tensioner.

FIG. 7 is a side view showing the folded state of the tensioner.

FIG. 8 is a cross-sectional view showing an end portion of the adjustment-side belt that is inserted through the winding shaft of the tensioner.

[Explanation of symbols]

 1 Fixed-side belt 2 Adjustment-side belt 21 Folding part 22 Stopping part 10 Loop-shaped locking part 10, 12 Hook 3 Tensioner 32 Winding shaft 32a Slit 5 Shock absorber 50 Sewing part 51 First layer 52 First sewing Thread 53 Second layer 54 Second sewing thread

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[Procedure amendment]

[Submission date] May 12, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

The belt tensioner 3 used in the master rope tensioning device has a grip portion 31 on the upper side and a bifurcated shape on the lower side, as is clear from FIGS. 4 to 8 . A handle 30 having a V-shaped frame shape is formed, and a slit 32a for inserting the free end side of the adjusting side belt 2 is provided between the open ends of the handle 30, and the belt 2 is inserted into the slit 32a. The take-up shaft 32, which is wound in a state, is rotatably supported, the ratchet wheel 33 is fixed to the take-up shaft 32, and the handle 30 has a feed claw 34 that can be engaged with and disengaged from the ratchet wheel 33. A lever 35 is attached, and the feed claw 34 of the release lever 35 and the ratchet wheel 33 are used to operate the handle 3
The inner frame 3 in which the fixed belt 1 is fixed to the winding shaft 32 while constituting a transmission mechanism 36 from 0 to the winding shaft 32.
7 is rotatably supported, and a reverse rotation preventing claw 38 that meshes with the ratchet wheel 33 and blocks rotation of the winding shaft 32 in the rewinding direction is attached to the inner frame 37. With the ratchet wheel 33,
A reverse rotation preventing mechanism 39 is formed to cancel the power transmission by the transmission mechanism 36 when the handle 30 is operated in the rewinding direction, and the handle 30 is folded toward the inner frame 37 side around the winding shaft 32. Configured as possible.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

When the fixed side belt 1 and the adjustment side belt 2 are to be tensioned, the feed claw 34 is repetitively operated by repeating the vertical swing operation of the handle 30.
The ratchet wheel 33 is rotated via the winding shaft 32, the winding shaft 32 is rotated in accordance with the rotation of the ratchet wheel 33, and the adjustment side belt 2 is wound on the winding shaft 32. The tension between the belt 2 and the fixed side belt 1 is performed. Further, after the belts 1 and 2 are tensioned, the handle 30 is rotated in a folding manner with respect to the inner frame 37 while the reverse rotation preventing claw 38 is engaged with the ratchet wheel 33. The ratchet wheel 33 is prevented from rotating freely, and the adjustment side belt 2 wound around the winding shaft 32 is prevented from being loosened.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

Further, in the embodiments shown in the respective drawings, the reverse rotation preventing claws projecting from the respective guide grooves 37a formed in the inner frame 37 on both side walls of the handle 30 facing the inner frame 37. 38 of the engagement portion 30c to be engaged at both outer ends of the restricting portions 38a are formed respectively, as shown in Figure 7, is rotated the handle 30 to form folded relative to the inner frame 37 At this time, the engagement portions 30c are engaged with both outer end portions of the regulation portions 38a while the reverse rotation preventing claws 38 are still engaged with the ratchet wheel 33. In doing so, each of the engaging portions 3
0c and the respective restricting portions 38a engage with each other to prevent the reverse rotation preventing claw 38 from freely retracting, that is,
When the ratchet wheel 33 is engaged with the reverse rotation preventing pawl 38, the ratchet wheel 33 can be prevented from moving backward, and the ratchet wheel 33 is rotated. Can be prevented from loosening without permission, and therefore, the safety can be improved.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Further, in the tensioner 3 configured as described above, as shown in FIG. 8, at the end side of the adjusting side belt 2 inserted into the slit 32a of the winding shaft 32, the belt is provided. The two may be folded back in a loop shape and overlapped, and the folded-back portion 21 may be sewn to provide the retaining portion 22 for preventing the winding shaft 32 from being separated from the slit 32a.

Claims (4)

[Claims] 1. A fixed side belt (1), an adjusting side belt (2) and the fixed side belt (1) is locked on one side, and the adjusting side belt (2) is wound on the other side, and It comprises a belt tensioner (3) for tensioning the fixed side belt (1) and the adjustment side belt (2), and hooking tools (11) (12) provided at the free ends of the belts (1) and (2). A master rope tensioning device using a belt, wherein the belt (1) and (2) are folded and overlapped on at least one of the belts (1) and (2), and the overlapped belts are sewn to each other to form the belt (1). A tension device for a master rope, comprising: a shock absorber (5) which absorbs a shock by breaking the sewn portion (50) by a tension of (2) or more. 2. A loop-shaped locking part (10) for overlapping and sewing the free end of the belt is provided at the free end part of the belt, and the locking part (10) is locked to a hooking tool. The tensioning device for a master rope according to claim 1, wherein the belts in the loop-shaped locking portion (10) are folded back and overlapped with each other, and the overlapped belts are sewn together to form a shock absorber (5). 3. A plurality of polymerized layers in which a belt is folded back and overlapped with each other, and among these polymerized layers, a first layer (51) is sewn with a first sewing thread (52), and a second layer (53). 3. The tensioning device for the master rope according to claim 1, wherein the second sewing thread (54) is sewn with a second sewing thread (54) with a sewing strength different from the sewing strength of the first sewing thread (52). 4. The belt (2) is folded back on the winding side end of the adjustment side belt (2) wound around the winding shaft (32) of the belt tensioner (3), and the folded back portion ( Two
The tensioning device for a master rope according to claim 1, further comprising a retaining portion (22) which is sewn to (1) to prevent the winding shaft (32) from being separated from the slit (32a).