WO2004012818A1

WO2004012818A1 - Rope for safety belt

Info

Publication number: WO2004012818A1
Application number: PCT/JP2002/008021
Authority: WO
Inventors: Hiroshi Sugishima; Mitsuya Uchida
Original assignee: Kuraray Co., Ltd.; Prop Co., Ltd.
Priority date: 2001-02-02
Filing date: 2002-08-06
Publication date: 2004-02-12
Also published as: JP2002227080A

Abstract

A rope for safety belt in which shrinkage of the rope body can be enhanced. Since the rope for safety belt employs high strength, high elastic modulus fibers having modulus of elasticity in tension not lower than 340 g/d in the core material (11a) in order to reduce elongation of the core material (11a) extremely, variation in the shape of the core material (11a) due to elongation can be prevented surely and the shrunk coil part can be restored to a specified length at all times.

Description

Description Safety rope Rope Technical field

TECHNICAL FIELD The present invention relates to a safety belt rope used for a safety belt worn by an operator at a high place work such as a construction site. Background art

In general, when working at high places such as construction sites, workers are required to wear safety belts to prevent falls. This safety belt has a rope of a predetermined length, and the hook attached to the tip of the mouthpiece is hung on a main rope at the work site so that the worker can be supported by the rope in case of a fall. ing.

However, when not using the safety belt rope, such as when working at high altitudes, the rope hook is hung on the worker's safety belt or held in a bag attached to the safety belt. Therefore, the mouth hangs down from the safety belt in a two-fold loop.

For this reason, the rope hanging down in a loop may be caught on the surrounding projections, etc., hindering work or movement, or the rope may be worn by contact with the floor surface etc., reducing the strength of the rope There was a problem such as.

Therefore, for example, as in the safety belt described in Japanese Utility Model Publication No. 3-301, the rope is formed into a coil that can be extended and retracted, and when no tension is generated, the mouth is contracted. It is known that the length of the rope when not in use is shortened by causing the rope to be unused. That is, the rope of the safety belt is formed of a core material made of chemical fiber such as nylon and a coating material made of vinyl resin, and is restored to a coil shape by the elasticity of the coating material. I have.

However, the chemical fiber used as the core material of the rope, when subjected to a load in the tensile direction, elongates according to its elastic modulus. On the other hand, a shape change may occur. For this reason, the coiled rope may be stretched by excessive tension or may be repeatedly expanded and contracted. Then, there was a problem that the resilience of the rope was reduced, and the length of the coiled rope when no load was applied was not restored to a predetermined length.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a safety belt rope capable of improving the resilience of a coiled rope. Disclosure of the invention

The present invention provides a safety band rope including a core body having a predetermined strength and a covering material that covers the core material, wherein at least a part of the rope body is formed in an extendable coil shape. In the above, the core material is formed of a fiber having a high elastic modulus of not less than 340 gZd.

Thus, when the rope is not used, the coil portion of the rope body contracts, and the length of the rope is shortened. In this case, since the core material of the rope body is made of a fiber with high elastic modulus, even if the rope body is stretched by excessive tension or the brass is repeatedly turned, the core material itself will grow extremely. Few.

Further, according to the present invention, in the above-described configuration, the covering material is formed of a tree having elasticity. This makes it possible to expand and contract the portion of the rope main body due to the elasticity of the covering material.

Further, the present invention, in the above configuration, includes a shock absorbing means for absorbing a shock in a tensile direction of the rope main body. As a result, in the event of a fall, the impact of falling from the safety belt to the worker is reduced.

Further, according to the present invention, in the above-mentioned configuration, the shock absorbing means may be configured such that a coating material forming a coil portion of the rope main body is fixed so as not to expand and contract, and the rope main body is covered when a load of a predetermined size or more is generated. The fixed portion of the material is formed so as to be separated. This makes it possible to configure the shock absorbing means with a simple structure in which only a part of the covering material is fixed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an overall view of a safety belt showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the rope main body. FIG. 3 is a partial front view of the rope main body.

FIG. 4 is a partial front view of the rope main body showing a state where the fixing portion is separated.

FIG. 5 is a diagram showing characteristics of the core material. BEST MODE FOR CARRYING OUT THE INVENTION

The safety belt 1 shown in FIGS. 1 to 5 is used for high-place work such as a construction site, and is provided with the safety belt rope 10 of the present invention.

That is, the safety belt 1 has a torso belt 1a worn by an operator, and a D-shaped ring 1b connecting the rope 10 is attached to the torso noselet 1a.

The rope 10 is composed of a mouthpiece body 11 partially formed in a coil shape and a hook 12 attached to one end of the rope body 11, and the other end of the rope body 11 is a safety belt 1. Ring 1b.

The rope body 11 is composed of a core material 11 a having a predetermined strength and a coating material 1 lb covering the core material 11 a, and the entire length of the rope body 11 in a tension state is a predetermined length (for example, 1 7 m).

The core material 11a is made of a high-strength high-modulus yarn with a tensile modulus of more than 340 g / d (42 GPa), and is made of a polyarylate fiber, aramid fiber, Polyethylene fiber, PB0 fiber (polyparaphenylenebenzobenzoxazole) and the like are preferred. For example, as shown in Fig. 5, polyarylate fiber is compared with vinylon (elastic modulus of 227 g / d (29 Gpa)) and polyester (elastic modulus of 170 d (21 Gpa)). It has an advantage in terms of tensile strength and elongation. As the coating material 11b, an elastic synthetic resin or the like is used. For example, urethane resin is preferable from the viewpoint of elastic recovery. That is, a part of the covering material 11b is formed in a coil shape in advance, and the elasticity of the covering material 11b causes the coil portion of the rope body 11 to expand and contract.

In addition, as shown in FIG. 3, the rope body 11 has a fixing portion 1 1c which is fixed to the other end side (a part of the safety band 1 ί) so as not to be able to expand and contract a covering material 1 1b which forms a coil portion. The fixed portion 11c is formed by welding the covering materials 11b of the coil portions 11 'of the rope body 11 to each other. That is, the fixing portion 11c forms a shock absorbing means. In this case, a load larger than a predetermined size (for example, 4 kN) When the weight is generated, the coil portions 11 of the fixed portion 11c are separated from each other as shown in FIG.

The hook 12 has a well-known mechanism and is configured to be detachable from a master rope or the like at a work site. Further, a storage bag 1c capable of storing the hooks 12 is provided on the trunk belt 1a of the safety belt 1.

The safety belt rope 10 configured as described above is used by hanging the hook 12 on a master rope or the like at the work site, and the coil-shaped mouthpiece body 11 expands and contracts as needed during the work.

When the rope 10 is not used, such as when working at high altitudes, the rope 10 can be held by putting the hook 12 of the rope 10 in the storage bag 1 c of the safety belt 1. It forms a two-fold loop and hangs down from the safety belt 1 side. At this time, the coil body contracts due to the elastic force of the covering material 11b, and the length of the rope body 11 shortens, so that the mouth 10 hanging down in a loop shape is pulled by surrounding protrusions and the like. There is no hanging.

Further, since the core material 11a of the rope 10 is made of a fiber having a high elastic modulus, the core material 1a can be stretched even if the mouthpiece body 11 is stretched by excessive tension or its expansion and contraction is repeated. The extension of 1a itself is extremely small.

Also, in the event of a fall, if the load due to the fall of the worker is applied to the rope 10 [I

As shown in Fig. 3, when the coil portion of the rope body 11 expands and the load reaches a predetermined amount or more, the fixed portion 11c of the rope body 11 Since 1 1 ′ is extended while being sequentially separated, the shock applied to the lobe body 11 is absorbed.

As described above, according to the present embodiment, since the core 11a is made of a fiber having a high elastic modulus, the thickness of the core 11a is extremely reduced. The shape change of 1a can be reliably prevented, and the length of the coil-shaped portion at the time of contraction can always be restored to a predetermined length.

In addition, since the covering material 11b is formed of an elastic resin, the elastic recovery rate can be arbitrarily set depending on the material of the covering material 11b. In this case, the covering material 1

• By forming 1b so that the coil shape recovery rate after applying a load of 1/20 of the tensile fracture stress of the core material 11a becomes 95% or more, a stable coil shape is always obtained. It can be maintained and is extremely advantageous in handling and durability.

Further, since the rope 10 of the present embodiment is provided with a shock absorbing means for absorbing a shock applied to the rope main body 11, in the event of a fall, a drop impact applied to the worker from the safety belt 1 side. Can be reduced. In this case, a part of the covering material 1 1b of the rope body 11 is fixed to each other, and when a load occurs at the time of dropping, the impact is absorbed while the coil portions 1 1 ′ of the fixing portion 1 1c are sequentially separated. As a result, the shock absorbing means can be configured at a low cost with a simple structure, which is extremely advantageous for cost reduction. The fixing part 1lc of the shock absorbing means may be a part of the coil part of the rope body 11 other than the one that welds 1 lb of the covering material, for example, a member that is broken by a load of a predetermined size or more. It is also possible to use a binding unit. Industrial applicability

As described above, according to the present invention, when a rope is not used, the coil portion of the mouth-opening body contracts and the length of the rope body can be shortened. Can be planned. In this case, since the shape change due to the elongation of the core material of the rope main body can be reliably prevented, the length of the coiled portion at the time of contraction can always be restored to a predetermined length, and the durability of the coiled portion can be improved. Can be improved.

Further, according to the present invention, the elasticity of the covering material allows the coil portion of the rope body to expand and contract, so that the elastic recovery rate can be arbitrarily set depending on the material of the covering material.

Further, according to the present invention, in the unlikely event of a fall, a drop impact applied to the worker from the safety belt side can be reduced, which is effective for protection of the human body.

Further, according to the present invention, the shock absorbing means can be configured at a low cost with a simple structure, which is extremely advantageous for cost reduction.

Claims

The scope of the claims

1.In a safety belt orifice provided with a rope body comprising a core material having a predetermined strength and a covering material covering the core material, at least a part of the rope body is formed in a coil shape which can be extended and contracted.

The core material was formed of a fiber having a high modulus of elasticity of at least 340 g / d.

A safety belt rope characterized by the following.

2. The covering material is made of elastic resin

The safety belt rope according to claim 1, characterized in that:

3. Equipped with shock absorbing means for absorbing the impact of the rope body in the tensile direction

3. The safety belt opening according to claim 1 or 2, wherein:

4. The impact absorbing means is fixed so that the covering material forming a part of the coil body of the rope body cannot be expanded and contracted, and when a load of a predetermined magnitude or more is applied to the rope body, the fixed portion of the covering material separates. Formed to

4. The σ-loop for a safety belt according to claim 3, wherein: