Harness-type safety belt

Abstract

To provide a harness-type safety belt, the thigh-horizontal harness-type safety belt, preventing loosening of thigh belts and preventing a chest belt from rising significantly when falling.SOLUTION: A harness-type safety belt comprises: a first belt extending forward from a right shoulder to a right thigh and extending rearward to the left thigh; a second belt extending forward from the left shoulder to the left thigh and extending rearward to the right thigh; a D-ring stopper for fixing an intersection of the first belt and the second belt on the back; a right thigh belt to be connected to a front lower end of the first belt and a rear lower end of the second belt; a left thigh belt to be connected to a front lower end of the second belt and a rear lower end of the first belt; and a chest belt for connecting the first belt and the second belt in front of the chest. The left / right thigh belts include a twisted part that is twisted once between connecting parts of the first belt and the second belt respectively to form an upward protrusion, where the first belt and the second belt are connected at both sides of the twisted part, and the first belt and the second belt are connected to the left / right thigh belts so as to be inclined toward the twisted part side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a harness-type safety belt used for preventing a worker from falling at a high place.

Background Art

[0002] In high-place work, a harness-type safety belt is used to prevent a worker from falling. The harness-type safety belt includes left and right shoulder belt portions, left and right leg belts, and a chest belt that connects the left and right shoulder belts. Such a harness-type safety belt is classified into an X-type and a Y-type according to the shape of the back belt, and is also classified into a V-type and a horizontal type according to the form when a pair of leg belts are worn.

[0003] Here, it is said that the one with an X-shaped back and a V-shaped leg belt is the safest. This type refers to, for example, the type in which a pair of leg belts form a V shape in the worn state as described in Patent Document 1 (see, for example, Patent Document 1). On the other hand, the type in which a pair of leg belts wind around the root of the thigh is called a horizontal type and has been gaining popularity in recent years from a design point of view (see, for example, Patent Document 2).

[0004] In any harness-type safety belt of the V-type or the horizontal type, the impact force at the time of falling is dispersed in each of the loop portion hanging on the shoulder and the loop portion hanging on the thigh, so that it has a characteristic that the load on the wearer is smaller than that of a body belt-type safety belt.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the case of a harness-type seat belt with a leg horizontal type, it is easy to wear the leg belt loosely, or the leg belt may become loose due to bending and stretching of the legs after wearing. When hanging down due to a fall or the like, the leg belt may slip down to the crotch and form a V shape, and the chest belt may slip up significantly. And when the slipping up is severe, there is also a risk that the neck may be tightened by the chest belt. Incidentally, such a problem does not occur in the V shape.

[0007] In view of such circumstances, an object of the present invention is to provide a harness-type seat belt of the leg horizontal type that prevents loosening of the leg belt and prevents the chest belt from rising significantly during a fall.

Means for Solving the Problems

[0008] An aspect of the present invention for solving the above problems includes a first belt extending from the right shoulder to the front side to the right leg and extending to the left leg on the rear side, a second belt extending from the left shoulder to the front side to the left leg and extending to the right leg on the rear side, a D-ring stopper for fixing the intersection of the back of the first belt and the second belt, a right leg belt connected to the lower end of the front side of the first belt and the lower end of the rear side of the second belt, a left leg belt connected to the lower end of the front side of the second belt and the lower end of the rear side of the first belt, and a chest belt connecting the first belt and the second belt in front of the chest. The right leg belt and the left leg belt are provided with a twisted portion that is twisted once and convex upward between the connection portions of the first belt and the second belt, and are connected to the first belt and the second belt on both sides of the twisted portion. The first belt and the second belt are connected to the right leg belt and the left leg belt in an inclined manner on the side of the twisted portion.

[0009] A second aspect of the present invention is the harness-type seat belt according to the first aspect, wherein the angle formed by the belts on both sides of the twisted portion of the right leg belt and the left leg belt is 120° to 170°.

[0010] A third aspect of the present invention is the harness-type seat belt according to the first or second aspect, wherein the angles formed by the right leg belt and the left leg belt with the first belt and the second belt are each 125° to 175°.

Advantages of the Invention

[0011] The harness-type seat belt of the present invention can prevent loosening of the leg belt and prevent the chest belt from rising significantly during a fall. That is, in the harness-type seat belt of the present invention, as described above, the leg belt does not need to be held down by muscles, so it is easy to move and has the advantage of greatly improving workability. Even when sitting or standing on a chair while wearing it, the leg belt of the muscles does not loosen, and the wearing state is maintained. Therefore, compared with the conventional leg horizontal type, the safety is greatly improved, and the safety is comparable to that of the V-shaped type.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0013] The present invention will be described in detail below based on embodiments.

[0014] (Embodiment 1) FIG. 1 is a rear view of a harness-type seat belt according to Embodiment 1 of the present invention, FIG. 2 is a partial enlarged view thereof, FIG. 3 is a photograph from the front, and FIG. 4 is a front photograph and a rear photograph showing the worn state.

[0015] As shown in FIG. 1, the harness-type seat belt 10 includes two belts 11 and 12. The two belts 11 and 12 have shoulder-hanging portions 11a and 12a, and are held in a crossed state by a D-ring stopper 13 at the upper part of the wearer's back.

[0016] The tip portions 11b and 12b of the belts extending from the shoulders of these two belts 11 and 12 to the front side are respectively connected to a pair of leg belts 14 and 15 by turning around from the side abdomen to the rear side, and the belts extending to the rear side cross at the D-ring stopper 13 on the back and turn around from the opposite side abdomen to the front side, and the tip portions 11c and 12c are respectively connected to the pair of leg belts 14 and 15. Specifically, the front tip portion 11b of the belt 11 for the right shoulder and the rear tip portion 12c of the belt 12 for the left shoulder are sewn to the leg belt 14 for the right leg to form connecting portions 16 and 17, and the front tip portion 12b of the belt 12 for the left shoulder and the rear tip portion 11c of the belt 11 for the right shoulder are sewn to the leg belt 15 for the left leg to form connecting portions 18 and 19.

[0017] The leg belts 14 and 15 each have a twisted portion 14a and 15a that is twisted once. The twisted portions 14a and 15a are fixed by sewing portions 14b and 15b that are sewn in a state where the leg belts 14 and 15 are twisted once and folded back to form the twisted portions 14a and 15a.

[0018] As a result, one end portion 14c and the other end portion 14d on both sides of the twisted portion 14a are in an inclined state with respect to each other. The angle θ1 formed by both the one end portion 14c and the other end portion 14d is 120° to 170°, preferably 130° to 160°. Also, one end portion 15c and the other end portion 15d on both sides of the twisted portion 15a are in an inclined state with respect to each other. The angle θ1 formed by both the one end portion 15c and the other end portion 15d is 120° to 170°, preferably 130° to 160°.

[0019] On the other hand, at the connecting portion 16 between the leg belt 14 and the front tip portion 11b of the right shoulder belt 11, the belt 11 is inclined and sewn to the side of the twisted portion 14a of the leg belt 14. Also, at the connecting portion 17 between the leg belt 11 and the rear tip portion 12c of the left shoulder belt 12, the belt 12 is inclined and sewn to the side of the twisted portion 14a of the leg belt 14. The angles θ2 and θ3 formed by the leg belt 14 and the belt 11 or the belt 12 are each 125° to 175°. Note that the angles θ2 and θ3 may be the same or different.

[0020] Also, at the connecting portion 18 between the leg belt 15 and the front tip portion 12b of the left shoulder belt 12, the belt 12 is inclined and sewn to the side of the twisted portion 15a of the leg belt 15. Also, at the connecting portion 19 between the leg belt 15 and the rear tip portion 11c of the right shoulder belt 11, the belt 11 is inclined and sewn to the side of the twisted portion 15a of the leg belt 15. Also in this case, the angles formed by the leg belt 15 and the belt 11 or the belt 12 are each 125° to 175°.

[0021] Furthermore, connecting members 21a and 21b are respectively provided at both ends of the leg belt 14, and connecting members 22a and 22b are respectively provided at both ends of the leg belt 15. The connecting members 21a, 21b and the connecting members 22a, 22b can be detachably connected to each other respectively. The connecting members 21a and 22a have engaging convex portions, and the connecting members 21b and 22b have engaging concave portions that can engage with the engaging convex portions. Note that the connection on the side of the connecting members 21b and 22b of the leg belts 14 and 15 is such that the ends are folded back and passed through the length adjustment ring portions of the connecting members 21a and 22a, and the ends are fixed by the fixing rings 23 and 24, whereby the lengths of the leg belts 14 and 15 can be adjusted respectively. Such leg belts 14 and 15 are annularly held around the legs by connecting the connecting members 21a, 21b and the connecting members 22a, 22b respectively.

[0022] Note that the materials of the connecting members 21a, 21b and the connecting members 22a, 22b are not particularly limited, and for example, those made of resin or metal can be used.

[0023] Also, a backrest cloth 25 is sewn to the back-side opening formed by the D-ring fasteners 13 where the belts 11 and 12 cross, so as to connect the belts 11 and 12 and block a part of the opening. In this embodiment, the backrest cloth 25 is formed of, for example, a mesh fabric. Of course, the backrest cloth 25 is not limited to the mesh fabric.

[0024] One end of the right chest belt 26 is fixed at a position corresponding to the front chest of the right belt 11, and one end of the left chest belt 27 is fixed at a position corresponding to the chest of the left belt 12. The fixing of each of the right chest belt 26 and the left chest belt 27 to the belts 11 and 12 is performed by sewing. However, the ends may be folded back and sewn to form an annular shape, and the belts 11 and 12 may be inserted through the annular portion to be movable.

[0025] In addition, connecting members 28a and 28b that are detachable from each other are provided at the other ends of the right chest belt 26 and the left chest belt 27, respectively. That is, the right chest belt 26 and the left chest belt 27 can be connected and separated by the connecting members 28a and 28b. In the present embodiment, the right chest belt 26 and the left chest belt 27 connected by the connecting members 28a and 28b are referred to as the chest belt. The connecting members 28a and 28b can be detachably connected to each other. The connecting member 28a has an engaging convex portion, and the connecting member 28b has an engaging concave portion that can engage with the engaging convex portion. The connection on the side of the connecting member 28a of the right chest belt 26 is such that the end portion is folded back and passed through the length adjustment ring portion of the connecting member 28a, and the end portion is fixed by the fixing ring 29, whereby the length of the chest belt can be adjusted. Note that the materials of the connecting members 28a and 28b are not particularly limited, and for example, resin-made or metal-made ones can be used.

[0026] Furthermore, the belts 11 and 12 can be adjusted in their overall lengths by length adjustment rings 31 and 32 and fixing rings 33 and 34 provided on the chest side, respectively. That is, the end portion of the shoulder-hanging portion 11a extending from the shoulder of the belt 11 is fixed to the fixed-side ring portion of the length adjustment ring 31, and the upper end portion of the chest front belt portion 11d is passed through the adjustment ring portion of the length adjustment ring 31 and folded back, and fixed by the fixing ring 33, whereby the length can be adjusted. Also, the end portion of the shoulder-hanging belt portion 12a extending from the shoulder of the belt 12 is fixed to the fixed-side ring portion of the length adjustment ring 32, and the upper end portion of the chest front belt portion 12d is passed through the adjustment ring portion of the length adjustment ring 32 and folded back, and fixed by the fixing ring 34, whereby the length can be adjusted.

[0027] In the harness-type seat belt 10 described above, a D-ring 35 for fixing a lanyard, which is a safety rope, is provided at the D-ring stopper 13 for crossing the belts 11 and 12. Also, leg pads 36 and 37 are provided at the end portions where the connecting members 21b and 22b of the leg belts 14 and 15 are provided. This is for reducing the pain caused by the buckle digging into the legs.

[0028] In this way, the leg belts 14 and 15 are each provided with a twisted portion 14a and 15a. At the connecting portions 16 and 17 sandwiching these, and at the connecting portions 18 and 19, the belts 11 and 12 are connected while being inclined toward the twisted portions 14a and 15a. Such twisted portions 14a and 15a are provided so as to be located on the outer sides of the right leg and the left leg, respectively. And the twisted portions 14a and 15a are each provided so as to be convex upward. Also, at the connecting portions 16 and 17 sandwiching the twisted portions 14a and 15a, and at the connecting portions 18 and 19, since the belts 11 and 12 are connected while being inclined toward the twisted portions 14a and 15a, the leg belts 14 and 15 worn around the legs are stably worn in an inclined state where the outer leg side is positioned higher than the inner leg side. Thereby, while maintaining the design of the leg horizontal type, the outer leg side is in the same position as the V shape. Note that the twisting direction of the twisted portions 14a and 15a is not particularly limited, and there is no problem even if it is twisted so that either side of the connecting portions 16 and 17 becomes the front side. Also, the sewing position of the belts 11 and 12 with respect to the leg belts 14 and 15 may be sewn on the front side instead of the back side as shown in the figure.

[0029] Conventional leg horizontal types are worn so as to suppress the rotation around the legs with leg belts. However, the leg muscles expand when squatting. For this reason, when the leg horizontal type is adjusted in size in a standing state, it becomes tight during the squatting operation, so it is invariably worn loosely. Even if the leg horizontal type is properly adjusted in size due to its structure, in the event of a fall, the chest belt has a structure that slips up greatly. Therefore, if it is worn loosely, the chest belt slips up even more, resulting in an increase in danger.

[0030] On the other hand, in the harness-type seat belt 10 of the present invention, as described above, unlike the conventional leg horizontal type, the leg belts 14 and 15 do not need to suppress the belts with muscles, so there is an advantage that they are easy to move and the workability is greatly improved. Furthermore, even when sitting or standing in the worn state, the leg belts 14 and 15 of the muscles do not loosen, and the worn state is maintained. Therefore, compared with the conventional leg horizontal type, the safety is greatly improved, and the safety becomes comparable to that of the V shape. FIG. 4 is a photograph showing the state in which the harness-type seat belt 10 of the present invention is worn. The leg belts 14 and 15 are in a V-shaped state L2 and L3 in which the outside is located above the horizontal state L1.

[0031] (Experimental Example) The harness-type seat belt 10 of the above-described embodiment was worn, and the state of being suspended by a rope via the D-ring 35 was observed. FIG. 5(a) is before the suspension, FIG. 5(b) is after the suspension, and the dotted line indicates the position of the chest pocket. FIG. 6 shows the case of another subject, and the state is the same as that of FIG. 5. As is clear from FIGS. 5 and 6, the position of the chest belt after the suspension was slightly higher than that before the suspension, but there was almost no change. On the other hand, the state before and after the suspension was observed when using a conventional leg horizontal type harness-type seat belt. The conventional leg horizontal type has no twisted portion in the leg belt, and the leg belt and the belt are fixed in an orthogonal state (see Patent Document 2). FIGS. 7 and 8 show the observation results of two subjects, and the dotted line indicates the position of the chest pocket. In this case, it was confirmed that the chest belt rose considerably after the suspension as compared with before the suspension.

Industrial Applicability

[0032] The present invention relates to a harness-type seat belt. In particular, although the back is described by taking the X-type as an example, the Y-type can also be suitably used in the same manner.

Explanation of Signs

[0033] 10... Harness-type seat belt, 11, 12... Belt, 13... D-ring stopper, 14, 15... Leg belt, 21a, 21b, 22a, 22b, 28a, 28b... Connecting tool, 25... Backrest cloth, 26... Right chest belt, 27... Left chest belt, 29... Fixed ring, 31, 32... Length adjustment ring, 33, 34... Fixed ring, 35... D-ring, 36, 37... Leg pad

Claims

Claim 1 A first belt extending from the right shoulder to the right leg along the front side and to the left leg along the rear side, a second belt extending from the left shoulder to the left leg along the front side and to the right leg along the rear side, a D-ring fastener for fixing the intersection of the first belt and the second belt on the back, a right-leg belt connected to the lower end of the front side of the first belt and the lower end of the rear side of the second belt, a left-leg belt connected to the lower end of the front side of the second belt and the lower end of the rear side of the first belt, and a chest belt for connecting the first belt and the second belt in front of the chest, wherein the right-leg belt and the left-leg belt are provided with a twisted portion that is twisted once and convex upward between the connection portions of the first belt and the second belt, and are connected to the first belt and the second belt on both sides of the twisted portion, and the first belt and the second belt are inclined and connected to the right-leg belt and the left-leg belt on the side of the twisted portion. A harness-type seat belt characterized by this. Claim 2 The harness-type seat belt according to claim 1, characterized in that the angle formed by the belts on both sides of the twisted portion of the right-leg belt and the left-leg belt is 120° to 170°. Claim 3 The harness-type seat belt according to claim 1 or 2, characterized in that the angles formed by the right-leg belt and the left-leg belt, and the first belt and the second belt are each 125° to 175°.

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