Fall arrest harness

Abstract

To provide a harness for crash prevention which is excellent in attachment property and movability.SOLUTION: A harness for crash prevention comprises: a front side belt 14; a rear side belt 12b; and a coupling tool 22 being provided around a waist part and having a laterally long insertion hole 22d. The front side belt is inserted into the insertion hole at a prescribed angle, and the front side belt is folded in a V-shape with a long side of the insertion hole as an original point, the rear side belt is inserted into the insertion hole at a same angle to the folding angle of the front side belt, and is folded in a V-shape with the long side of the insertion hole as an original point, an end part of a folded part of the front side belt is coupled to the rear side belt, an end part of a folded part of the rear side belt is coupled to the front side belt, therefore a belt coupling structure on a waist part belt intersection part where the front and rear side belts are coupled to the coupling tool, is formed, the belt coupling structure being configured so that the front side belt and the rear side belt can be slid in linkage in a longitudinal direction, with the insertion hole as an original point.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fall prevention harness that is worn by a worker when working at height to prevent the worker from falling. [Background technology]

[0002] At work sites at height, workers are required to wear fall arrest devices to prevent their falls in the event of a fall. Of these, harness-type fall arrest devices mainly consist of a harness and a lanyard. Workers attach a hook or similar device to a lifeline or a solid structure, and connect the other end of the lanyard to the harness worn around their body to prevent falls in the event of a misstep or other accident.

[0003] Harnesses are classified into two types, X-type and Y-type, depending on the shape of the belt from the shoulders to the back. When viewed from the back, an X-type harness has a pair of shoulder straps that cross at approximately the center of the back, forming an X shape. When viewed from the back, a Y-type harness has a pair of shoulder straps that overlap at approximately the center of the back and extend to the buttocks, forming a Y shape.

[0004] Known X-type harnesses have a structure in which the front shoulder belt on the chest side and the rear shoulder belt on the back side extend diagonally downward and cross each other around the waist. A structure in which the front shoulder belt and the rear shoulder belt are sewn together at crossing points formed near the left and right waists has been disclosed (see, for example, Patent Document 1). Also disclosed is a structure in which an insertion portion is provided in one belt at the waist belt crossing portion, and the other belt is inserted into this insertion portion (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-61237 [Patent Document 2] Japanese Patent Publication No. 2020-28386 Summary of the Invention [Problem to be solved by the invention]

[0006] In the waist belt crossing structures disclosed in the above Patent Documents 1 and 2, when the wearer moves or works, particularly when bending or crouching, the belt located at the rear of the body may become taut and hinder the movement. An object of the present invention is to provide a fall arrest harness that is easy to wear and has excellent mobility. [Means for solving the problem]

[0007] The fall arrest harness of the present invention comprises a front belt, a rear belt, and a connecting device provided around the waist and having a long, horizontal insertion hole, wherein the front belt is inserted into the insertion hole at a predetermined angle and is folded back in a V shape starting from the long side of the insertion hole, and the rear belt is inserted into the insertion hole at the same angle as the folding angle of the front belt and is folded back in a V shape starting from the long side of the insertion hole, with the end of the folded portion of the front belt connected to the rear belt and the end of the folded portion of the rear belt connected to the front belt, thereby forming a belt connection structure at the waist belt intersection where the front belt and the rear belt are each connected to the connecting device, and the belt connection structure is configured so that the front belt and the rear belt can slide in unison in the longitudinal direction starting from the insertion hole. In the fall arrest harness of the present invention, it is preferable that the front belt is a shoulder belt or side belt extending toward the chest, and the rear belt is a shoulder belt extending toward the back. [Effects of the Invention]

[0008] In the fall arrest harness according to the present invention, the front belt is inserted at a predetermined angle into a horizontally elongated insertion hole of a connector provided around the waist and folded back in a V shape starting from the long side of the insertion hole, while the rear belt is inserted through the insertion hole at the same angle as the folding angle of the front belt and folded back in a V shape starting from the long side of the insertion hole. The end of the folded portion of the front belt is connected to the rear belt, and the end of the folded portion of the rear belt is connected to the front belt, thereby forming a belt connection structure at the waist belt intersection where the front belt and rear belt are each connected to the connector. The belt connection structure is configured so that the front belt and rear belt can slide in unison in the longitudinal direction starting from the insertion hole. This structure provides a fall arrest harness with excellent wearability and mobility. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a fall prevention harness according to an embodiment of the present invention. [Figure 2] FIG. 4 is a partial enlarged view of a waist belt crossing portion. [Figure 3] FIG. 10 is a diagram showing the state in which two belts are overlapped and passed through an insertion hole in the process of manufacturing the belt connection structure. [Figure 4] FIG. 10 is a diagram showing the state in which two belts are opened vertically starting from the long side of the insertion hole and crossed in the process of manufacturing the belt connection structure. [Figure 5] FIG. 10 is a diagram showing the state in which two belts are folded back at the long sides of the insertion holes, positioned, and temporarily fixed in place during the manufacturing process of the belt connection structure. [Figure 6] FIG. 10 is a diagram showing the state in which the ends of two belts have been sewn together in the process of manufacturing the belt connecting structure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a fall arrest harness according to this embodiment. As shown in Fig. 1, a fall arrest harness 10 of this embodiment includes a pair of shoulder belts 12, a pair of side belts 14, a pair of thigh belts 16, a chest belt 18, a chest metal fitting 20, a waist metal fitting 22 as a connector, a hip support belt 24, a fixing plate 26, and a back D-ring 28. In the harness shown in Fig. 1, the chest belt 18 is disconnected, and the chest D-ring is not connected. In this embodiment, the chest side when the harness is worn may be referred to as the front side, and the back side may be referred to as the rear side.

[0011] Each shoulder belt 12 is folded back upward. This folding forms a front shoulder belt portion 12a and a rear shoulder belt portion 12b serving as a rear belt. The front shoulder belt portion 12a extends downward on the front side and is connected to a chest metal fitting 20 around the chest. The rear shoulder belt portions 12b cross over each other on the back side to form a back crossing portion 30. The rear shoulder belt portions 12b with the back crossing portion 30 formed thereon are connected to a waist metal fitting 22 serving as a connector around the waist.

[0012] FIG. 2 is a partially enlarged view of the waist belt crossing portion. As shown in FIG. 2, in this embodiment, the waist metal fitting 22 comprises an upper plate 22a, a lower plate 22b, and a shaft portion 22c. The upper plate 22a and the lower plate 22b are formed from plate-like members. The upper plate 22a is provided with an upper insertion hole 22d as an insertion hole and a shaft hole 22e for connecting to the lower plate 22c. The upper insertion hole 22d is formed as an elongated hole having a width and length sufficient to allow overlapping belts to pass through, and is provided horizontally above the upper plate 22a. The shaft hole 22e is provided below the upper plate 22a. The lower plate 22b is provided with a shaft hole 22f for connecting to the upper plate 22a, and a lower first insertion hole 22g and a lower second insertion hole 22h through which the thigh belt 16 is inserted. The lower first insertion hole 22g and the lower second insertion hole 22h are formed as elongated holes with a width and length sufficient to allow the thigh belt 16 to be inserted, and are provided below the lower waist metal fitting 22b in an inverted V shape. The shaft hole 22f is provided above the lower plate 22b. The waist fitting 22 has a structure in which an upper plate 22a and a lower plate 22b are stacked so that the axial holes 22e and 22f are connected, and an axial portion 22c is passed through the axial holes 22e and 22f to connect them, and the lower plate 22b is connected to the upper plate 22a so that it can rotate.

[0013] The rear shoulder belt portion 12b is inserted through an upper insertion hole 22d provided in the upper plate 22a near the waist. One end of the side belt 14 serving as a front belt is connected to the chest metal fitting 20 and extends downward, and the other end is inserted through an upper insertion hole 22d provided in the upper plate 22a near the waist. That is, the rear shoulder belt portion 12b and the side belt 14 are each inserted through the upper insertion hole 22d. The rear shoulder belt portion 12b inserted into the upper insertion hole 22d is folded back in a V shape starting from the long side of the upper insertion hole 22d. Also, the side belt 14 inserted into the upper insertion hole 22d is folded back in a V shape starting from the long side of the upper insertion hole 22d. The end of the folded-back portion of the side belt 14 is connected to the rear shoulder belt 12b, and the end of the folded-back portion of the rear shoulder belt 12b is connected to the side belt 14. The interval is adjusted so that a predetermined gap is created between the belt folding position and the connecting position of each belt. This gap ensures a range of motion for the belt connecting structure. Specifically, it is preferable to adjust the interval so that each belt can slide 20 to 30 mm in the longitudinal direction. In this connecting structure, the side belt 14 and the rear shoulder belt 12b are configured to be able to slide in conjunction with each other in the longitudinal direction, starting from the upper insertion hole 22d.

[0014] Returning to FIG. 1 , the chest belt 18 includes a first chest belt portion 18a, a second chest belt portion 18b, and a buckle 18c. The first chest belt portion 18a is connected to one of the chest metal fittings 20. The second chest belt portion 18b is connected to the other chest metal fitting 20. The buckle 18c includes a buckle body 18d and a tongue plate 18e. In this chest belt 18, the buckle body 18d is connected to an end of the first chest belt portion 18a. The tongue plate 18e is connected to an end of the second chest belt portion 18b. The tongue plate 18e is inserted into the buckle body 18d to connect them, and can be removed by pulling the tongue plate 18e out of the buckle body 18d to disconnect them. The buckle 18c allows the first chest belt portion 18a and the second chest belt portion 18b to be connected and disconnected.

[0015] The thigh belt 16 comprises a first thigh belt portion 16a, a second thigh belt portion 16b, and a buckle 16c. One end of the first thigh belt portion 16a and one end of the second thigh belt portion 16b are each connected to a lower waist metal fitting of the waist metal fitting 22, with the first thigh belt portion 16a extending toward the front side and the second thigh belt portion 16b extending toward the rear side. The first thigh belt portion 16a is inserted through a lower first insertion hole, and the second thigh belt portion 16b is inserted through a lower second insertion hole. The buckle 16c is composed of a buckle body 16d and a tongue plate 16e. The buckle body 16d is connected to the other end of the first thigh belt portion 16a, and the tongue plate 16e is connected to the other end of the second thigh belt portion 16b. The tongue plate 16e is inserted into the buckle body 16d to connect them, and can be removed by pulling the tongue plate 16e out of the buckle body 16d to disconnect them. The buckle 16c allows the first thigh belt portion 16a and the second thigh belt portion 16b to be connected and disconnected.

[0016] The hip support belt 24 is configured so that both ends thereof are connected to the second thigh belt portions 16b of the respective thigh belts 16, thereby connecting the pair of thigh belts 16 together. The fixing plate 26 is disposed at the back crossing portion 30. The pair of rear shoulder belts 12b are passed through the fixing plate 26 so as to cross each other. The fixing plate 26 is attached to the pair of rear shoulder belt portions 12b. The back D-ring 28 is attached to the fixed plate 26 and the pair of rear shoulder belt portions 12b at the back intersection portion 30. The back D-ring 28 has a base portion 28a and a curved portion 28b. The base portion 28a extends in a substantially straight line. The curved portion 28b extends from one end of the base portion 28a to the other end, curving convexly in a direction away from the base portion 28a. The curved portion 28b is curved in a smooth curve. The base portion 28a is attached by being sandwiched between the pair of intersecting rear shoulder belt portions 12b and the fixed plate 26.

[0017] The process of manufacturing the belt connection structure at the waist belt crossing portion of the fall arrest harness of this embodiment will be described below. Figures 3 to 6 are diagrams illustrating the process of manufacturing the belt connection structure. For simplicity, only the upper plate 22a of the waist metal fitting is shown. In addition, in Figures 3 to 6, the waist belt crossing portion is shown sideways, with the left side of the waist metal fitting (upper plate 22a) facing the upper body, and the right side facing the lower body. Figure 3 shows the state in which two overlapping belts have been passed through the upper insertion hole. The two belts B1 and B2 are each provided with a marking at a predetermined position for positioning. The markings are preferably provided at two locations: the turn-back position M1 and the overlap position M2. The intervals between the markings M1 and M2 are preferably adjusted so that a predetermined gap is created between the belt turn-back position and the connection position of each belt, in order to ensure a range of motion for the belt connection structure. Specifically, the markings are preferably adjusted so that each belt can slide 20 to 30 mm in the longitudinal direction when the belt connection structure is fabricated. Furthermore, the markings are provided at positions where the distance from the end of the belt to the turn-back position M1 is equal to the distance from the turn-back position M1 to the overlap position M2. As shown in Figure 3, two belts B1 and B2 are overlapped and inserted into the upper insertion hole 22d of the upper plate 22a. The inserted belts are placed end to end. The inserted belts are also positioned so that the marking of the fold position M1 overlaps the long side of the upper insertion hole 22d.

[0018] FIG. 4 shows a state in which two belts are opened vertically starting from the long side of the upper insertion hole and crossed. Next, as shown in Fig. 4, the belts inserted into the upper insertion holes 22d are slid in the directions indicated by the arrows in the figure. The slid belts B1 and B2 are arranged in an X shape, crossing each other with the marking of the folding position M1 as the center.

[0019] FIG. 5 shows the state in which the two belts are folded back at the long sides of the upper insertion hole, positioned, and temporarily fixed. Next, as shown in Figure 5, the portions B3 and B4 of the belts B1 and B2 that were inserted through the upper insertion hole 22d are folded back starting from the long side of the upper insertion hole 22d. Belts B3 and B4 are folded back at the marking of folding position M1. This folding back causes the two belts to be folded alternately, with the other folded belt end B4 overlapping one belt B1 and the other folded belt end B3 overlapping the other belt B2. The overlapping belts are aligned with the markings at the overlapping position M2, and then the positioned belts are temporarily fixed. Methods of temporary fixing include pinning, clipping, welding, and temporary sewing. The temporarily fixed belts are arranged in a V-shape.

[0020] FIG. 6 shows the state in which the ends of the two belts have been sewn together. Then, as shown in Figure 6, at the temporarily fixed positions, one of the overlapping belts B1 is connected to the other belt end B4, and the other belt B2 is connected to one of the belt end B3. The belts are preferably connected by sewing. Other possible methods include bonding with a chemical adhesive, crimping with metal terminals, or welding with heat. By going through the above steps, the belt connection structure shown in FIG. 2 can be produced.

[0021] <Effects of this embodiment> According to this embodiment, the following effects can be obtained. In the fall arrest harness of this embodiment, the belt connection structure at the waist belt intersection is composed of only two belts: the waist metal fitting 22, and the side belt 14 and the rear shoulder belt portion 12b of the shoulder belt 12. In this way, the number of parts that make up the belt connection structure is small, making it lightweight. Furthermore, the side belts 14 and the rear shoulder belt portion 12b are configured to be slidable in the longitudinal direction starting from the upper insertion hole 22d. With this configuration, when bending or squatting, the side belts 14 and the rear shoulder belt portion 12b slide in the contracting direction and the extending direction, respectively, so that the belts positioned at the rear of the body do not become taut and impede the movement. This provides a harness with excellent wearability and mobility. Furthermore, because the belts are slidable, even if a load is applied to the waist belt intersection, the belts slide, dispersing the load. Therefore, the belt connection structure described above is less likely to concentrate loads at the stitching points and is less likely to cause the belt to become misaligned, resulting in high strength. Furthermore, the belt connecting structure connects the end of the folded-back portion of the side belt 14 to the rear shoulder belt 12b, and the end of the folded-back portion of the rear shoulder belt 12b to the side belt 14, thereby connecting the side belt 14 and the rear shoulder belt 12b to the waist metal fitting 22. By adopting the above-described connecting structure, even if loads are applied to the waist belt intersection from various directions, unnatural loads are unlikely to be applied to the belt or stitching. As a result, the strength is high and the safety is excellent.

[0022] <Modification> The present invention is not limited to the above-described embodiments, and any modifications and improvements that can achieve the object of the present invention are included in the present invention. In the above embodiment, the side belt 14 is provided and connected to the waist metal fitting 22, but the present invention is not limited to this. For example, the front shoulder belt portion may be elongated to the length of the side belt, and this elongated front shoulder belt portion may be connected to the waist metal fitting instead of the side belt.

[0023] In the above embodiment, the belt connecting structure is formed by the upper plate 22a, rear shoulder belt portion 12b, and side belt 14, but is not limited to this. For example, the belt connecting structure may be formed by the lower plate 22b, first thigh belt portion 16a, and second thigh belt portion 16b. Furthermore, the belt connecting structure may be provided on both the upper plate 22a side and the lower plate 22b side. When forming a belt connection structure on the lower plate 22b side, instead of the lower first insertion hole 22g and the lower second insertion hole 22h, a long, horizontal insertion hole is provided that has a width and length sufficient to allow the belt superimposed below the lower plate 22b to pass through. Then, first thigh belt portion 16a and second thigh belt portion 16b are inserted into the horizontally elongated insertion hole, respectively, and folded back in a V shape starting from the long side of the horizontally elongated insertion hole, with the end of the folded back portion of first thigh belt portion 16a connected to second thigh belt portion 16b, and the end of the folded back portion of second thigh belt portion 16b connected to first thigh belt portion 16a.

[0024] Furthermore, in the above embodiment, the waist fitting 22 is made up of an upper plate 22a and a lower plate 22b, but this is not limiting. The waist fitting may also be made up of a single plate-like member in which the upper plate and the lower plate are integrated. [Industrial Applicability]

[0025] The fall arrest harness described above can be widely applied to harnesses used for work at height. [Explanation of symbols]

[0026] 10 Fall arrest harness 12 Shoulder strap 12a Front shoulder belt 12b Rear shoulder belt (rear belt) 14 Side belt (front belt) 22 Waist metal fittings (connectors) 22d Upper insertion hole (insertion hole)

Claims

1. The device comprises a front belt, a rear belt, and a connecting device provided around the waist and having a horizontally long insertion hole, The front belt is inserted into the insertion hole at a predetermined angle and folded back in a V shape starting from a long side of the insertion hole, the rear belt is inserted through the insertion hole at the same angle as the folding angle of the front belt, and is folded back in a V shape starting from a long side of the insertion hole, an end of the folded portion of the front belt is connected to the rear belt, and an end of the folded portion of the rear belt is connected to the front belt, thereby providing a belt connection structure at a waist belt crossing portion in which the front belt and the rear belt are each connected to the connecting device; The belt connection structure is configured so that the front belt and the rear belt can slide in conjunction with each other in the longitudinal direction starting from the insertion hole. A fall arrest harness characterized by:

2. The front belt is a shoulder belt or a side belt extending toward the chest, and the rear belt is a shoulder belt extending toward the back. A fall arrest harness according to claim 1.

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