JP7141111B2 - harness type safety belt - Google Patents

Description

The present invention relates to the structure of a harness-type safety belt.

In general, when working at a high place such as a construction site, a user is obliged to wear a safety belt to prevent falling. This type of safety belt comprises a waist belt attached to the torso of the human body and a rope of a predetermined length connected to the waist belt. It is common to hang it on a parent rope or the like at the site. However, since this waist belt-type safety belt is attached to the torso of the human body, the tension from the rope concentrates on the torso and the suspended posture tends to become unstable. Therefore, by providing a belt that extends not only over the torso of the human body but also over both shoulders, back and thighs, and by connecting a rope to the back belt, the tension from the rope applied to the human body is dispersed by the belt, BACKGROUND ART So-called harness-type safety belts that stably support a human body are known.

Harness-type safety belts include a leg loop harness (sit harness) that holds the waist and thighs, a chest harness that holds the chest above the torso, and a full body harness. A full body harness, also called a "full harness type", is a type of safety belt that holds the whole body by passing belts through the thighs and shoulders in addition to the torso. For convenience of explanation, the "full body harness type safety belt" will be referred to as "harness type safety belt" or simply "harness". Compared to the waist belt type, the harness is superior in that it does not fall off, the load in the event of a crash is not concentrated on the torso, and a natural posture can be maintained even when suspended. For this reason, in recent years, it has become popular in Japan as well, mainly at construction sites.

As such a conventional harness, for example, there is a type called Y type, which includes shoulder belts that are applied to both shoulders of the user, thigh belts that are worn around the user's thighs, and the user's harness. An upper belt branching member that is arranged above and below the back and branches the shoulder belt to or converges from both shoulders of the user, a lower belt branching member that is connected to the thigh belt or the connecting belt, and fixes the lanyard. It has a configuration provided with a D ring. In other words, the harness can be said to be a structure mainly composed of a band-shaped belt wrapped around the entire body. Each belt employs a wide fabric made of flexible fibers. Polyester fibers and nylon fibers, for example, are used as the fibers. In addition, the belt is provided with a length adjuster, and the length can be adjusted by folding back the belt and pushing/pulling it.

In Patent Document 1, a pair of shoulder belts that extend from the left and right of the waist to the back side when worn by a user, cross each other, are hung on both shoulders, are almost parallel on the left and right of the chest side, and return to the left and right of the waist; A pair of loop-shaped thigh belts that are connected to the belt on the left and right of the waist, extend from the left and right of the waist to both thighs and return to the left and right of the waist along the base of the thigh, and a chest that connects the left and right shoulder belts on the chest side. Harnesses have been proposed that consist of a belt and a connecting belt that connects across loops at two points on each thigh belt. Patent Document 1 aims at preventing the entanglement of the belt with the structure described above.

JP 2009-112368 A

Harnesses are intended to prevent falls for workers who work at heights, and to protect their bodies from the impact of falls in the event of a fall accident. Therefore, it is necessary for the user to wear the belt firmly so that the body does not slip out of the harness.

However, since each belt of the harness is not configured in consideration of comfort when worn, no consideration has been given to stretchability in the past. That is, since it is difficult for the user to work with the harness if it is too tight, there is a tendency for the user to wear the harness loosely, such as by adjusting the length of each belt. In such a situation, for example, an unacceptable gap may occur between the thigh belt and the thigh. In other words, due to this gap, the amount of movement of the body becomes longer than expected at the time of falling impact, and the risk increases.

The present invention has been invented in view of the above points, and an object thereof is to provide a structure of a harness-type safety belt that does not give a cramped feeling when worn so as to be properly worn on the body.

A harness-type safety belt according to the present invention is directly or indirectly connected to a shoulder belt that passes through the user's shoulders and extends downward from both shoulders on the front side of the user at one end side of the shoulder belt. A harness-type safety belt comprising a thigh belt and a back belt integrally formed with or connected to the shoulder belt and extending downward on the user's back side, comprising: the shoulder belt, the thigh belt Alternatively, the back belt is provided with a stretchable member. Moreover, the structure provided with the connection belt connected with a thigh belt via a lower belt fastener from the lower end of a back belt may be sufficient. Moreover, both the back belt and the thigh belt, or both the connecting belt and the thigh belt may be provided with elastic members. Furthermore, stretchable members may be provided on each of the back belt, the pair of connecting belts, and the pair of thigh belts.

Note that the elastic member may be an elastic belt. Alternatively, the elastic member may comprise a hollow tubular body with wrinkles formed in the longitudinal direction. Further, the hollow tubular body may have an elastic belt passed through the tubular body and form a bellows shape in which the wrinkle width changes according to the expansion and contraction of the elastic belt. In addition, the elastic belt includes a bellows portion having a bellows structure that expands and contracts in the length direction, and binding portions that are bound to both ends of the bellows portion. A plurality of elastic threads are woven in the belt-shaped body including the layer and the second layer in the longitudinal direction, and on the first layer side of the belt-shaped body, the first layer sewing part of the elastic thread is the belt-shaped body. A plurality of locations are provided in the longitudinal direction of the belt-like body, and on the second layer side of the belt-shaped body, the second layer sewing locations of the elastic thread are provided at a plurality of locations in the length direction of the belt-shaped body. The first layer stitching portion and the second layer stitching portion are arranged alternately, and the first layer stitching portion and the second layer stitching portion stretch the knitted elastic thread in the width direction of the strip. It is characterized by being sewn. In addition, the bellows portion may restrict the maximum extension length of the elastic member.

A harness-type safety belt according to the present invention has a stretchable member provided on a shoulder belt, a thigh belt, or a back belt. According to such a configuration, in order to allow the wearer to wear it properly on the body, the burden during work is reduced by reducing the cramped feeling given when the wearer wears it. Therefore, it is possible to improve the degree of close contact with the body when worn, which has the effect of reducing fall accidents.

Schematic which shows an example of the harness which concerns on 1st Embodiment. Schematic which shows the modification of the connection structure of a thigh belt and a connection belt. Schematic which shows the modification of the connection structure of a thigh belt and a connection belt. Schematic which shows the modification of the connection structure of a thigh belt and a connection belt. The rear view which shows the state which the user wears the harness which concerns on 1st Embodiment. The side view which shows an example of the expansion-contraction member which concerns on embodiment. The side view which shows the other example of the expansion-contraction member which concerns on embodiment. Schematic which shows an example of the harness which concerns on 2nd Embodiment. The rear view which shows the state which the user wears the harness which concerns on 2nd Embodiment. The side view which shows an example of the expansion-contraction member of a thigh belt. The side view which shows the other example of the expansion-contraction member of a thigh belt. Schematic which shows an example of the harness which concerns on 3rd Embodiment. The rear view which shows the state which the user wears the harness which concerns on 3rd Embodiment. The side view which shows an example of the expansion-contraction member of a connection belt. The side view which shows the other example of the expansion-contraction member of a connection belt. The schematic diagram which showed an example of expansion-contraction of a connection belt. The figure which showed the result of the tensile test of the connection belt. The figure which showed the result of the tension test of harness cloth. Schematic which shows the modification of the harness which concerns on 3rd Embodiment. The rear view which shows the state which the user wears the modification of the harness which concerns on 3rd Embodiment. Schematic which shows an example of the harness which concerns on 4th Embodiment. The rear view which shows the state which the user wears the harness which concerns on 4th Embodiment. The side view which shows an example of the expansion-contraction member of a thigh belt. The side view which shows an example of the expansion-contraction member of a back belt. The side view which shows an example of the expansion-contraction member of a connection belt. The figure which shows a mode that a back belt and a thigh belt ride up by the body exercise|movement of the user who wore the conventional harness. The figure which shows a mode that a back belt and a thigh belt ride up by the body exercise|movement of the user who wore the conventional harness. Schematic diagram showing the standing state of a human. Schematic diagram showing a human crouching state. Schematic diagram showing a squatting state of a human. The back view which shows the state which the user wears the harness which concerns on a Y type modification. The schematic front view which shows the harness which concerns on an X type modification. The schematic front view which shows the harness which concerns on an X type modification. The schematic rear view which shows the harness which concerns on an H type modification. The schematic rear view which shows the harness which concerns on another modification.

Before describing the embodiments, the circumstances leading to the present invention will be briefly described. As described in the background art, the reason why the wearer tends to wear the harness-type safety belt loosely is that the harness-type safety belt reduces the degree of freedom of the body. In other words, taking clothes as an example, it is easy to understand that if you put your jacket in your trousers and repeat stretching and bending several times, the hem of the jacket you put in will protrude from your trousers. This is because the hem is pulled out of the pants every time the spine repeats expansion and contraction for each position. Distortion of the clothes releases the hem of the jacket from being fixed by the trousers, so the degree of restraint on bending of the body is reduced. That is, the degree of freedom of body movement increases.

Based on the above, the case of a harness type safety belt will be explained. When a harness-type safety belt is worn in close contact with the body in the same way, there is no space between the thigh belt and the thigh or between the belt on the torso and the torso, making it difficult to bend and straining the back muscles. If the belt is stretched, the belt length adjusted by the length adjuster may be forcibly changed.

It is necessary to consider what the minimum necessary range of expansion and contraction should be in the elastic material of the harness-type safety belt according to the embodiment of the present invention. Therefore, the applicant of the present application measured the relationship between the height of 10 subjects and the length of the spine when flexed. Specifically, 10 subjects with a height of 152 cm to 182 cm were targeted, and the length from the base of the neck to the tailbone of each subject was measured in the upright state and in the state of squatting and bending forward (bent state). It was measured. Table 1 shows the measurement results of 10 subjects, and the unit is cm. As shown in Table 1, the resulting difference between the upright and flexed states was a minimum of 4.5 cm and a maximum of 12 cm.

According to the results in Table 1, a difference of at least 4.5 cm to 12 cm occurs when the user performs the physical exercise described above. If this difference occurs, it is thought that the conventional harness-type safety belt does not expand and contract, so it puts pressure on the human body and gives a feeling of tension, or the belt length adjusted by the length adjuster is forcibly changed. be done.

Next, in conducting the same verification for harnesses with elastic members, we investigated whether there were any parts other than the back that caused discomfort when worn. Then, it was the thigh that came out as the opinion of most of the subjects. Conventional harness-type safety belts have a short length from the buttocks to the thighs. It was found that the thigh belt and the connecting belt did not expand and contract in the case of wearing the belt.

In addition, when the patient squatted, the thigh deformed and swelled due to body weight, etc., and became longer than the original length around the thigh (the length of the closed curve). When actually measuring the circumference of the thigh of a 170 cm subject among the aforementioned subjects, 52 cm expanded to 56 cm, and the circumference of the thigh of the 181 cm subject expanded from 58 cm to 64 cm. In other words, it was found that if the harness-type safety belt is attached to the user's body so as to be in close contact with the user's body when the user is standing, the thigh belt will bite into the user's thigh when the user is crouching, causing discomfort to the user. In addition, when the body is twisted from side to side, the thigh belt may dig into the thigh.

From the above verification, it has been found that the feeling of tightness during wearing can be reduced by using one stretchable member for the back belt and one stretchable member for each of the thigh belts.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the same parts are denoted by the same numbers, and overlapping descriptions are omitted. Also, it should be noted that the drawings may be exaggerated for better understanding of the present invention and are not necessarily drawn to scale. In addition, the present invention is not limited to the examples shown below.

[First embodiment]
[overall structure]
A first embodiment will be described with reference to FIGS. 1A to 3B. FIG. 1A is a diagram schematically showing the overall configuration of a harness-type safety belt 100. FIG. FIG. 1A shows one form of each form of a full harness called a so-called Y-shaped harness. However, the embodiments of the present invention are not limited to this, and can be applied to various full harnesses such as other Y-shaped harnesses, X-shaped harnesses, and H-shaped harnesses.

As shown in FIG. 1A, harness-type safety belt 100 includes shoulder belts 101A, 101B, thigh belts 102A, 102B, back belt 103, connecting belts 104A, 104B, D-ring 107, and upper belt fastener 108. , a lower belt fastener 109, and chest belts 112A and 112B.

The shoulder belt 101A is a strip-shaped belt having a predetermined length, one end of which is connected to a thigh belt 102A (described later), and the other end of which is integrally formed with the back belt 103. As shown in FIG. The back belt 103 integrally formed with the shoulder belt 101A extends downward from the boundary with the shoulder belt 101A and is integrally formed with the connecting belt 104B. In the description of the harness-type safety belt 100, the shoulder belt 101A, the back belt 103, and the connecting belt 104B are identified by different reference numerals for convenience of description. That is, it is not shown with the intention of manufacturing each separately and connecting them integrally. However, it is also possible to adopt a configuration in which they are individually manufactured and connected using arbitrary connection means. The total length of the shoulder belt 101A, the back belt 103, and the connecting belt 104B is the length from the upper surface of the user's shoulder to the center of the thigh, the thickness of the shoulder, and the length from the lower end of the neck to the center of the buttocks. Considering the length and the length from the center of the buttocks to the center of the thighs, it is set for each user's physique.

The thigh belt 102A is a band-shaped belt having a predetermined length (for example, a length slightly longer than the circumference of the user's thigh). As shown in FIG. 1A, a portion (for example, an end) of the connecting belt 104A is fixed at a predetermined position on the thigh belt 102A. This fixation is, for example, by suturing, bonding, or the like. Note that this fixed portion is illustrated as a connecting portion 123A in FIG. 1A. A first buckle 124A and a second buckle 125A are provided at both ends of the thigh belt 102A, respectively. A holding state with the thigh is formed. The first buckle 124A and the second buckle 125A are not limited to the form shown in FIG. 1A, and may take other forms. In addition, the end of the shoulder belt 101A is connected and fixed to a position closer to the connecting portion 123A than the second buckle 125A in the thigh belt 102A. This fixation also includes, for example, suturing and adhesion. Alternatively, as shown in FIGS. 1B to 1D, the end portion of the connecting belt 104A (connecting belt 104B) may be formed in a ring shape, and the thigh belt 102A may be passed through the ring. At this time, movable fasteners may be provided on both sides of the thigh belt 102A adjacent to the portion where it intersects with the connecting belt 104A to maintain the relative position of the two.

The shoulder belt 101B is a strip-shaped belt having a predetermined length, one end of which is connected to a thigh belt 102B (described later), and the other end of which is integrally formed with another back belt (not shown). In addition, this other back belt (not shown) is located on the back side of the back belt 103 in FIG. 1A (the back side on the paper surface of FIG. 1A), extends downward from the boundary portion with the shoulder belt 101B, and is connected to the connecting belt 104A. formed integrally with In the description of the harness-type safety belt 100, the shoulder belt 101B and the connecting belt 104A are identified by different reference numerals for convenience of description, as described above. The total length of the shoulder belt 101B, other back belts (not shown), and the connecting belt 104A is the same as above.

As with the thigh belt 102A, the thigh belt 102B is a strip-shaped belt having a predetermined length, and a portion (for example, an end) of the connecting belt 104B is fixed near the center in the longitudinal direction ( connection portion 123B). A first buckle 124A and a second buckle 125A are provided at both ends of the thigh belt 102A.

Also, the shoulder belts 101A and 101B are coupled or connected via an upper belt fastener 108. As shown in FIG. The shoulder belt 101A and the back belt 103 integrated therewith, and the shoulder belt 101B and the other back belt (not shown) integrated therewith are linked or connected via a lower belt fastener 109. As shown in FIG. Each of the upper belt fastener 108 and the lower belt fastener 109 has two vertically spaced long holes for belt passage. Shoulder belts 101A and 101B (hereinafter referred to as “first belt” and “second belt”) are passed through the two long holes of the upper belt fastener 108, respectively. Similarly, the two slots in the lower belt fastener 109 are passed through the back belt 103 and another back belt (not shown). The boundary between the back belt and the connecting belt, which are conceptually distinguished in this embodiment, is determined corresponding to the position of the lower belt fastener 109 (for example, the central position of the lower belt fastener 109).

That is, one of the shoulder belt 101A, the back belt 103 and the connecting belt 104B (hereinafter sometimes referred to as "first belt"), the shoulder belt 101B, the other back belt (not shown) and It can be said that the harness-type safety belt 100 is configured including the other belt (hereinafter sometimes referred to as "second belt") that constitutes the connecting belt 104A. These first and second belts are held at positions corresponding to the upper and lower parts of the user's back, such as the back belt 103, via upper belt fasteners 108 and lower belt fasteners 109. The relative positions of the first belt and the second belt are fixed. As will be described later, the first belt of the harness-type safety belt 100 holds the right half of the user's body, and the second belt holds the left half of the user's body.

It should be noted that each belt is preferably made of a wide woven fabric made of flexible fibers. Polyester fiber or nylon fiber can be used as the fiber. In addition, each belt is provided with a length adjuster, and the length can be adjusted by folding back the belt and pushing/pulling it. Moreover, the pair of shoulder belts 101A and 101B may be provided with shoulder pads at portions that contact the shoulders of the user.

The harness-type safety belt 100 can be provided with chest belts 112A and 112B connected at the user's chest in a pair of shoulder belts 101A and 101B extending downward from both shoulders on the user's front side. In addition, it is possible to adopt a configuration in which the female 113A and the male 113B of the chest belt buckle are connected. A D-ring 107 that connects to the lanyard may be attached to the upper end of the back belt 103 (eg, at a location between the upper belt clasp 108 and the lower belt clasp 109). In the example of FIG. 1, the D-ring 107 is provided below and adjacent to the upper belt fastener 108 .

As an example of the above configuration, the overall configuration of the harness-type safety belt 100 can be rephrased as follows.

Please refer to FIG. 2 which shows the harness type safety belt 100 being worn. As shown in FIG. 2, the harness-type safety belt 100 bifurcates upward from an upper belt fastener 108 placed on the user's back, passes over the user's shoulders, and extends to the user's front side. A pair of shoulder belts 101A and 101B extending downward from both shoulders, a pair of thigh belts 102A and 102B attached to the lower ends of the pair of shoulder belts 101A and 101B, and upper belt fasteners 108 to the center of the user's back. a back belt 103 extending downward, and a pair of connecting belts 104A and 104B extending from the lower end of the back belt 103 via a lower belt fastener 109 in a bifurcated manner and connected to a pair of thigh belts 102A and 102B. Prepare. In addition, the “upper back” in the present invention is a position substantially equidistant from the left and right shoulder blades, and is the position of the upper belt fastener 108 or the D-ring 107 .

One ends of the shoulder belts 101A and 101B are fixed to a pair of thigh belts 102A and 102B, respectively. Fixation may be performed by suturing, bonding, or the like. On the other hand, the pair of connecting belts 104A, 104B extends in a bifurcated crossing or connection via the lower belt fastener 109 and is connected to the pair of thigh belts 102A, 102B.

[Expansion member]
In the first embodiment, a part of the back belt 103 of the harness-type safety belt 100 is provided with a stretchable member 130 . Other back belts (not shown) may be similarly provided with elastic members. In addition, the elastic member 130 may be provided on any one of the pair of shoulder belts 101A and 101B, the pair of thigh belts 102A and 102B, or the connecting belts 104A and 104B, or a plurality of these belts. Next, a specific configuration of the elastic member 130 will be described.

FIG. 2 is a rear view showing a state in which a user wears the harness-type safety belt 100 according to the first embodiment of the present invention. The elastic member 130 includes a bellows portion 131 and a binding portion 132 . The bellows portion 131 has a bellows structure that expands and contracts in the length direction (longitudinal direction of the back belt 103 and the like). The connecting portions 132 are connected to both ends of the bellows portion 131 in the length direction (that is, so as to sandwich the bellows portion 131 ) and are connected to the back belt 103 . The same applies to the elastic member of the back belt (not shown).

FIG. 3 is a schematic side view showing an example of the elastic member 130 according to the embodiment. FIG. 3A shows a side view of the elastic member 130 according to an embodiment. As described above, the expandable member 130 has a bellows structure with the bellows portion 131 provided so as to be sandwiched between the binding portions 132, and expands and contracts in the length direction.

Further, the bellows portion 131 is configured as a belt-like body having a first layer and a second layer woven with non-stretchable yarns. A plurality of elastic threads are inserted in the longitudinal direction and woven into both the first layer and the second layer of the strip. The first layer of the belt-like body is provided with first-layer sewn-on portions closed with sewn threads at equal intervals in the width direction. Similarly, on the second layer, the second layer sewn portions closed with the sewn thread are provided at equal intervals in the width direction. As a result, when the elastic thread is contracted, the belt-like body constitutes peaks and valleys of the bellows. As the non-stretchable thread, a thread having a strong tensile force may be selected in addition to nylon. In addition to stretch nylon, elastic synthetic resin or natural rubber may be used as the elastic thread. At each sewn portion, both ends in the length direction and both ends in the width direction of the bellows portion 131 are preferably sewn. In addition, the first layer and the second layer of the strip may be sewn into a tubular shape.

On the other hand, FIG. 3B shows a side view of an elastic member 130 ′, which is a modified example of the elastic member 130 . A flat elastic belt, such as a rubber belt, can be used as the elastic member 130' according to the modified example.

In the first embodiment, the harness-type safety belt 1 is provided with the stretchable member 130 on the back belt 103, but the stretchable member is provided only on the pair of connecting belts 104A and 104B instead of the back belt 103. can be Refer to the third embodiment for this.

[Second embodiment]
A second embodiment will be described with reference to FIGS. 4 to 6B. FIG. 4 is a diagram schematically showing the overall configuration of the harness-type safety belt 200. As shown in FIG. FIG. 4 shows one form of a Y-shaped harness. The basic configuration of the harness-type safety belt 200 in the second embodiment is the same as the basic configuration of the harness-type safety belt 100 in the first embodiment. Therefore, description of the basic configuration of the harness-type safety belt 200 may be omitted. As shown in FIG. 4, harness-type safety belt 200 includes shoulder belts 201A and 201B, thigh belts 202A and 202B, back belt 203, connecting belts 204A and 204B, D ring 207, and upper belt fastener 208. , a lower belt fastener 209, and chest belts 212A and 212B. These are the shoulder belts 101A and 101B, the thigh belts 102A and 102B, the back belt 103, the connection belts 104A and 104B, the D ring 107, the upper belt fastener 108, and the lower belt in the harness type safety belt 100. The fastener 109, the chest belts 112A and 112B, and the role and arrangement of each part are the same.

The wearing state of the harness-type safety belt 200 will be described with reference to FIG. FIG. 5 is a rear view showing a state in which a user wears the harness 200 according to the second embodiment. As shown in FIG. 5, the shoulder belts 201A and 201B on the back side of the user are bifurcated upward from the upper belt fastener 208 and extend over the user's shoulders, and the back belt 203 is the upper belt fastener. From 208 it extends down the center of the user's back. The connecting belts 204A, 204B extend from the lower end of the back belt 203 via the lower belt fastener 209 in a bifurcated manner and are fixed to the respective thigh belts 202A, 202B.

In the second embodiment, the thigh belts 202A and 202B of the harness-type safety belt 200 are provided with stretchable members 220A and 220B, respectively. Further, in the harness-type safety belt 200, the back belt 203 is provided with an elastic member 230 that can be expanded and contracted in the same manner as in the first embodiment. Other back belts (not shown) may be similarly provided with elastic members. In addition, the elastic member may be provided on either one of the pair of shoulder belts 201A and 201B or the connecting belts 204A and 204B, or a plurality of these belts.

As shown in FIG. 6, the elastic member 220A includes a bellows portion 221A and a binding portion 222A. The bellows portion 221A and the binding portion 222A basically have the same configuration as the bellows portion 131 and the binding portion 132 of the first embodiment. However, the bellows portion 221A also expands and contracts in the length direction, and the length direction corresponds to the longitudinal direction of the thigh belt 202A. The elastic member 220B is the same as the elastic member 220A. Since the thigh belts 202A and 202B are provided with the stretchable members 220A and 220B, the thigh belts do not bite into the thighs when the user twists the body from side to side or squats down. It is possible to suppress situations that give pleasure. Note that the stretchable member 230 and the stretchable member provided on the back belt (not shown) are the same as those in the first embodiment, so description thereof will be omitted.

FIG. 6 is a side view showing an example of elastic members 220A and 220B according to the present invention. FIG. 6A shows a side view of telescopic members 220A and 220B according to the second embodiment, which will be described as telescopic member 220 here. As shown in FIG. 6A, the telescopic member 220 has the same configuration as the telescopic member 130 of the first embodiment. Therefore, detailed description of the configuration is omitted.

On the other hand, FIG. 6B shows a side view of an elastic member 220 ′, which is a modified example of the elastic member 220 . A flat elastic belt, such as a rubber belt, can be used as the elastic member 220'. In the harness-type safety belt 200, the thigh belts 202A and 202B are provided with elastic members 220A and 220B, respectively. In such a configuration, it is also possible to adopt a configuration in which the thigh belts 202A and 202B are not provided with connecting buckles (224A, 225A, 224B and 225B). That is, it is also possible to form each of the thigh belts 202A and 202B in an endless shape (annular shape). With such a configuration, the user can easily wear the thigh belts 202A and 202B on the left and right thighs by expanding the outer diameter using the elastic expansion and contraction of the elastic members 220A and 220B.

[Third embodiment]
The third embodiment will be described in detail with reference to FIGS. 7-13B. In addition, the third embodiment corresponds to the fact that the belt of the harness needs to be contracted from the buttocks to the thighs when the person shifts from the crouching state to the squatting state shown in FIG. 18C described later. It is an example.

FIG. 7 is a diagram schematically showing the overall configuration of the harness-type safety belt 300. As shown in FIG. FIG. 7 shows one form of a Y-shaped harness. The basic configuration of the harness-type safety belt 300 in the third embodiment is the same as the basic configuration of the harness-type safety belt 100 in the first embodiment. Therefore, description of the basic configuration of the harness-type safety belt 300 may be omitted. As shown in FIG. 7, harness-type safety belt 300 includes shoulder belts 301A and 301B, thigh belts 302A and 302B, back belt 303, connecting belts 304A and 304B, D ring 307, and upper belt fastener 308. , a lower belt fastener 309, and chest belts 312A, 312B. These are the shoulder belts 101A and 101B, the thigh belts 102A and 102B, the back belt 103, the connection belts 104A and 104B, the D ring 107, the upper belt fastener 108, and the lower belt in the harness type safety belt 100. The fastener 109, the chest belts 112A and 112B, and the role and arrangement of each part are the same.

The wearing state of the harness-type safety belt 300 will be described with reference to FIG. FIG. 8 is a rear view showing a state in which a user wears the harness-type safety belt 300 according to the third embodiment. As shown in FIG. 8, the shoulder belts 301A and 301B on the back side of the user are bifurcated upward from the upper belt fastener 308 and extend over the user's shoulders. extends down the center of the user's back from the . The connecting belts 304A, 304B are bifurcated from the lower end of the back belt 303 via the lower belt fastener 309, and are fixed to the respective thigh belts 302A, 302B.

In the third embodiment, connecting belts 304A and 304B of the harness-type safety belt 300 are provided with stretchable members 340A and 340B, respectively.

Further, in the harness-type safety belt 300, the thigh belts 302A, 302B may be provided with stretchable members 320A, 320B. In addition, in the third embodiment, the harness-type safety belt 300 can be provided with a stretchable elastic member on the back belt 303 and the back belt (not shown), as in the second embodiment. In addition, the elastic member may be provided on the pair of shoulder belts 301A and 301B.

The elastic member 320A includes a bellows portion 321A and a binding portion 322A. The bellows portion 321A and the binding portion 322A basically have the same configuration as the bellows portion 221A and the binding portion 222A of the second embodiment. The elastic member 320B is the same as the elastic member 320A. Since the thigh belts 302A and 302B are provided with the elastic members 320A and 320B, respectively, the thigh belts bite into the thighs when the user twists the body from side to side or squats down. Situations that cause discomfort can be suppressed.

Further, as shown in FIG. 9A, in the harness-type safety belt 300, the connection belts 304A and 304B are provided with stretchable members 340A and 340B. The elastic member 340A includes a bellows portion 341A and a binding portion 342A. The bellows portion 341A and the binding portion 342A basically have the same configuration as the bellows portion 131 and the binding portion 132 of the first embodiment. However, the bellows portion 341A also expands and contracts in the length direction, and the length direction corresponds to the longitudinal direction of the connecting belt 304A. The elastic member 340B is the same as the elastic member 340A. In this way, the elastic members 340A and 340B are provided on the pair of connecting belts 304A and 304B, so that when the person squats down, the belt from the thigh to the buttocks is stretched and the thigh belt to the thigh is stretched. It is possible to correct encroachment.

On the other hand, FIG. 9B shows a side view of an elastic member 340 ′, which is a modified example of the elastic member 340 . A flat elastic belt, such as a rubber belt, can be used as the elastic member 340'. In harness-type safety belt 300, thigh belts 302A and 302B are provided with elastic members 320A and 320B, respectively. In such a configuration, it is also possible to adopt a configuration in which the thigh belts 302A, 302B are not provided with connecting buckles (324A, 325A, 324B, 325B). That is, it is also possible to form each of the thigh belts 302A and 302B in an endless shape (annular shape). With such a configuration, the user can easily wear the thigh belts 302A and 302B on the left and right thighs by expanding the outer diameter by utilizing the elastic expansion and contraction of the elastic members 320A and 320B.

Consider the elastic member 340 disposed on the connecting belts 304A, 304B. The safety of the harness-type safety belt is improved in areas where expansion and contraction is unnecessary by providing the expansion and contraction members 340 in the easily expanding and contracting portions of the connection belts 304A and 304B rather than using the expansion and contraction members 340 for the entirety of the connection belts 304A and 304B. It is thought that it is possible to reduce the cramped feeling at the time of wearing in the place where expansion and contraction is necessary. However, since it is not clear which part is more likely to expand and contract, a demonstration experiment was conducted on a subject with a height of 173 cm and a length from the base of the neck to the tailbone of 75 cm. The results of this demonstration experiment are shown in FIG. For this test subject, the base of the neck is near the position of the upper end portion (upper belt fastener 308) of the back belt 303 of the harness-type safety belt, and the coccyx is the lower end portion of the connecting belts 304A and 304B (a pair of connecting belts). 304A, 304B and a pair of thigh belts 302A, 302B). In addition, when the back belt 303 and the connecting belt 304A are one belt, the connecting portion may be, for example, the intermediate position of the lower belt fastener 309 or above the lower belt fastener 309 (upper belt fastener 308 side). ).

As shown in FIG. 10, the length from the base of the neck to the tailbone of this subject was 85 cm when the subject bent down, and was elongated by 10 cm. In addition, the region (first region) from the base of the neck to 35 cm was not elongated. In other words, when the position of the upper belt fastener 308 on the back belt 303 is the upper end, and the position of the connecting portion between the pair of connecting belts 304A and 304B and the pair of thigh belts 302A and 302B is the lower end, 40/75 from the lower end. The area within ≈53% was elongated by 10 cm.

From the results shown in FIG. 10, when the intermediate position of the upper belt fastener 308 in the back belt 303 is defined as the "upper end" and the connecting portion (for example, the intermediate position of the lower belt fastener 309) is defined as the "lower end", It was considered preferable that the elastic member be provided in an area where the ratio of the distance from the lower end to the distance from the lower end to the upper end is within 53%. The distance from the lower end of the expandable member means the distance from the lower end to the middle position of the expandable member in the longitudinal direction, or the distance from the lower end to the position on the lower end side of the expandable member.

In addition, as shown in FIG. 10, regarding the expansion and contraction of 10 cm, expansion and contraction of 4 cm was confirmed in the region 20 cm from the coccyx (third region), whereas in the region 20 cm to 40 cm from the coccyx (second region) Expansion and contraction of 6 cm was confirmed. In other words, large expansion and contraction was confirmed in the area of 20/75≈27% or more from the lower ends of the pair of connecting belts 304A and 304B.

From this result, the position of the upper belt fastener 308 on the back belt is the upper end, and the connection portion between the pair of connecting belts 304A and 304B and the pair of thigh belts 302A and 302B (for example, the intermediate position of the lower belt fastener 309 or the lower belt It is preferable that the elastic member 340 is provided in a region where the ratio of the distance from the lower end to the distance from the lower end to the upper end is 27% to 53% when the position near the upper side of the fastener 309 is the lower end. it was thought.

Moreover, as already shown in Table 1, it was confirmed that the pair of connecting belts 304A and 304B requires a minimum elongation of about 4.5/46≈10%. In addition, this numerical value "4.5" is a numerical value indicating the "difference" in the measurement results of a subject with a height of 152 cm in Table 1, and "46" is the length from the base of the neck to the tailbone in an upright state. Indicates the measured value. It was also confirmed that the connecting belts 304A and 304B need to be elongated by a maximum of 12/67≈18% (see the measurement results of a subject with a height of 181 cm). In other words, it was considered preferable that the elastic members provided on the pair of connecting belts 304A and 304B be configured to be able to extend each of the connecting belts 304A and 304B by 10% to 18% in the direction in which the connecting belts extend. .

It is considered preferable that the stretchable member 340 includes a material (elastic member) that is elastically deformable such that it is contracted when the user is standing and is stretched when the user is bent. However, if the elastic member is easily stretchable (loose), the safety of the harness may be compromised. On the other hand, if the elastic member is difficult to stretch, it may not be possible to suppress the cramped feeling when wearing. Therefore, in order to investigate the optimum elastic member for the elastic member 340, a demonstration experiment was conducted. First, various elastic members were applied to the connecting belt, a questionnaire was given to 10 subjects, and an elastic member that was neither loose nor constricting was selected. Subsequently, the relationship between elongation and force of the selected elastic member and harness fabric was measured by performing a tensile test under the following conditions. The results are shown in FIGS. 11 and 12. FIG.
<Test conditions>
Testing machine: Autograph (manufactured by Shimadzu Corporation, model AG-IS 50-KN)
Temperature 10 degrees Humidity 20%
Objects to be measured:1. Elastic member (length 60 mm)
2. Harness fabric (length 60mm)

As shown in FIG. 11, the elastic member has a static load of 5 N to 25 N required to be stretched by 45 mm (Table 1: minimum difference) and is stretched by 120 mm (Table 1: maximum difference). The static load required for this was 30N to 50N. Specifically, the elastic member satisfies the following equation (1) for the static load F (N) required to extend the length ΔL (mm) in the range of 45 mm to 120 mm.
[Number 1]
ΔL/3−10≦F≦ΔL/3+10 Expression (1)

On the other hand, as shown in FIG. 12, the static load required to stretch the harness fabric by 80 mm was about 55 kN, and it was found that the harness fabric hardly stretched compared to the elastic member. In other words, it was found that there is no need to consider the expansion and contraction of the harness fabric when evaluating the expansion and contraction member.

From the results of the tensile test on the elastic member that is not loose and does not feel cramped (see Fig. 11) and the result of the tensile test on the harness fabric (see Fig. 12), the following connecting belts were selected as a result of the questionnaire. It was thought that if the elastic member 340 were used, it would not be loose and would not give a cramped feeling. That is, the elastic member 340 requires a static load of 5N to 25N to extend 45mm and a static load of 30N to 50N to extend 120mm. When such a stretchable member 340 is used, even when the harness-type safety belt is worn in close contact with the wearer, the feeling of crampedness can be reduced, and the situation in which the harness-type safety belt is worn loosely can be suppressed. . As a result, the safety of the harness type safety belt is improved. In other words, the static load F(N) required to extend the elastic member 340 by the length ΔL (mm) in the range of 45 mm to 120 mm satisfies the relationship of the above equation (1). Furthermore, since the harness fabric hardly stretches compared to the elastic member, it was thought that by weaving the elastic member into the harness fabric, for example, the maximum extension length of the elastic member can be regulated.

Next, the elastic members 320A, 320B arranged on the thigh belts 302A, 302B will be examined. As already mentioned, when the thigh circumference of a 170 cm subject was measured, 52 cm expanded to 56 cm, and the thigh circumference of a 181 cm subject expanded from 58 cm to 64 cm. In addition, in all subjects, a greater elongation was confirmed on the user's back (buttocks) side than on the front side. For this reason, it was considered preferable that the elastic members 320A and 320B in the thigh belts 302A and 302B be provided on the buttock side of the user.

When an elastic member that can be elastically deformed is used as the elastic member of the harness-type safety belt 300, properties required for the elastic member will be examined. Assuming that such an elastic member is based on the already explained formula (1), the length of the elastic member is set to 60 mm, and when a load of 17 N is applied, it is considered good to stretch about 80 mm. On the other hand, the elastic member of the harness-type safety belt is required to have a restoring force with little change in shape even after repeated expansion and contraction. It is considered that the restoring force is affected not only by the physical properties such as Young's modulus of the elastic member, but also by the shape and the like. Therefore, demonstration experiments were conducted using elastic members of various types and shapes.

First, five kinds of rubbers A to E were selected and processed into the following shapes. Then, a load of 17 N was applied to each rubber, and the stretched length of the rubber was measured. The measurement was performed 10 times and the average value was obtained. Table 2 shows the results.
<Rubber shape>
Flat type: thickness 0.5 mm x width 12 mm, length 60 mm
String: 2.5 mm outer diameter, 60 mm long
Linear: outer diameter 0.5 mm, length 60 mm

Based on the already explained formula (1), it is considered that the length of the elastic member is 60 mm, and an elastic member that stretches about 80 mm when a load of 17 N is applied is preferable. It was considered that 7 cord-like or linear-like cords were preferable.

Subsequently, the restoring force of the 7 cord-like and linear 7-wires was investigated. The type of rubber was C, and seven string-like or linear members were cut into 400 mm pieces, and the action of stretching and returning was repeated for the final 10,000 times, and the length of the elastic member when no load was applied was measured every 2,000 times. Table 3 shows the results.

From the results shown in Table 3, it was found that the elastic member is preferably composed of a plurality of linear members, particularly preferably composed of seven linear members having an outer diameter of 0.5 mm. In other words, the elastic member is preferably composed of seven linear members each having an outer diameter of 0.5 mm, and it was thought that this would make it possible to obtain a stretchable member with a high restoring force.

The elastic member 340 of the harness-type safety belt 300 configured as described above has the position of the upper belt fastener 308 on the back belt 303 as the upper end, and the pair of connecting belts 304A and 304B and the pair of thigh belts 302A and 302B. When the position of the connecting portion of is the lower end, the ratio of the distance from the lower end to the distance from the lower end to the upper end is provided in an area within 53%. By providing the elastic member 340 in this area, the safety of the harness-type safety belt 300 is improved in the area where expansion/contraction is unnecessary, and the feeling of crampedness is reduced when the pair of connecting belts 304A and 304B are required to be expanded/contracted. can.

In addition, when the position of the upper belt fastener 308 on the back belt 303 is the upper end, and the position of the connecting portion between the pair of connecting belts 304A and 304B and the pair of thigh belts 302A and 302B is the lower end, the elastic member 340 is The ratio of the distance from the lower end to the distance from the lower end to the upper end is provided in a region of 27% to 53%. By providing the stretchable member 340 in this region, it is possible to further reduce the feeling of tightness when wearing the connecting belts 304A and 304B where expansion and contraction is required. The safety of the mold safety belt 300 is further improved.

Further, the elastic members 340 provided on the pair of connecting belts 304A and 304B are configured to be able to extend the connecting belts 304A and 304B by 10% to 18% in the direction in which the connecting belts 304A and 304B extend. By extending the stretchable member 340 within this range, the safety of the harness-type safety belt 300 is improved, and the feeling of tightness when worn can be reduced.

Further, the elastic members 340 provided on the connecting belts 304A and 304B require a static load of 5N to 25N to extend by 45mm, and a static load of 30N to 50N to extend by 120mm. Since the force required to extend the elastic member by 45 mm or 120 mm is within the above range, even when the harness type safety belt is worn in close contact, the feeling of tightness can be reduced. is loosely attached. As a result, it is possible to achieve both an improvement in the safety of the harness-type safety belt 500 and a reduction in feeling of crampedness when wearing it, which was not possible in the prior art.

In addition, the static load F (N) required to extend the elastic member 340 provided on the connecting belts 304A and 304B by the length ΔL (mm) in the range of 45 mm to 120 mm satisfies the relationship of the above formula (1). . Since the force required to extend the elastic member 340 by 45 mm to 120 mm is within the range of the above formula (1), even when the harness type safety belt is worn in close contact, the feeling of tightness can be reduced. , the situation in which the harness-type safety belt is worn loosely can be suppressed. As a result, it is possible to achieve both an improvement in the safety of the harness-type safety belt 500 and a reduction in feeling of crampedness when wearing it, which was not possible in the prior art.

In addition, elastic members 320A and 320B provided on thigh belts 302A and 302B are arranged on the buttock side of the user. By providing the elastic members 320A and 320B on the buttocks side of the user, it is possible to further reduce the feeling of tightness when wearing the thigh belts 302A and 302B where expansion/contraction is required, and the degree of closeness to the body in the areas where expansion/contraction is unnecessary. is ensured, and the safety of the harness-type safety belt 300 is further improved.

In addition, the elastic member 340 includes an elastic member that can be elastically deformed, and the elastic member is composed of a plurality of linear members. The elastic member is composed of seven linear members with an outer diameter of 0.5 mm. As a result, the stretchable member 340 having appropriate stretchability and restoring force for the harness-type safety belt 300 can be obtained.

A modification of the harness-type safety belt according to the third embodiment will be described with reference to FIGS. 13A and 13B. The harness-type safety belt 500 according to the modification of the third embodiment differs from the harness-type safety belt 300 according to the third embodiment in that elastic members are arranged on the back belt instead of the pair of connecting belts. Other configurations of the harness-type safety belt 500 are the same as those of the harness-type safety belt 300 .

The harness-type safety belt 500 includes shoulder belts 501A and 501B, thigh belts 502A and 502B, a back belt 503, connecting belts 504A and 504B, a D ring 507, an upper belt fastener 508, and a lower belt fastener. 509 and chest belts 512A and 512B. These are the shoulder belts 101A and 101B, the thigh belts 102A and 102B, the back belt 103, the connection belts 104A and 104B, the D ring 107, the upper belt fastener 108, and the lower belt in the harness type safety belt 100. The fastener 109, the chest belts 112A and 112B, and the role and arrangement of each part are the same. Therefore, the explanation is omitted. A pair of thigh belts 502A, 502B and a back belt 503 are provided with stretchable members 520A, 520B, 530, respectively. Note that the elastic members may be provided on the pair of shoulder belts 501A and 501B.

Elastic members 520A, 520B, and 530 are, for example, elastic belts. The elastic members 520A, 520B, and 530 are the same in configuration and position in each belt as described above. Therefore, a detailed description of the configuration is omitted.

The elastic member 530 of the harness-type safety belt 500 has an upper end at the position of the upper belt fastener 508 on the back belt 503, and a lower end at the position of the connecting portion between the pair of connecting belts 504A and 504B and the pair of thigh belts 502A and 502B. is provided in an area where the ratio of the distance from the lower end to the distance from the lower end to the upper end is within 53%. By providing the elastic member 530 in this area, the safety of the harness-type safety belt 500 is improved in the area where expansion/contraction is not required, and the feeling of crampedness when worn in the area where the back belt 503 needs to be expanded/contracted can be reduced.

Further, the elastic member 530 provided on the back belt 503 is configured to be able to extend the back belt 503 by 10% to 18% in the direction in which the back belt 503 extends. By extending the stretchable member 530 within this range, the safety of the harness-type safety belt 500 is improved, and the cramped feeling when worn can be reduced.

[Fourth Embodiment]
A fourth embodiment will be described with reference to FIGS. 14 to 16C. FIG. 14 is a diagram schematically showing the overall configuration of the harness-type safety belt 400. As shown in FIG. As shown in FIG. 14, a harness-type safety belt 400 according to the fourth embodiment includes shoulder belts 401A and 401B, thigh belts 402A and 402B, a back belt 403, connecting belts 404A and 404B, and a D ring 407. , an upper belt clasp 408, a lower belt clasp 409, and chest belts 412A, 412B. These are the shoulder belts 101A and 101B, the thigh belts 102A and 102B, the back belt 103, the connection belts 104A and 104B, the D ring 107, the upper belt fastener 108, and the lower belt in the harness type safety belt 100. The fastener 109, the chest belts 112A and 112B, and the role and arrangement of each part are the same. Therefore, the explanation is omitted.

Please refer to FIG. FIG. 15 is a rear view showing a state in which a user wears the harness 400 according to the fourth embodiment. As shown in FIG. 15, the shoulder belts 401A and 401B on the back side of the user are bifurcated upward from the upper belt fastener 408 and extend over the user's shoulders, and the back belt 403 is the upper belt fastener. Extends from 408 down the middle of the user's back. The connecting belts 404A, 404B extend from the lower end of the back belt 403 via the lower belt fastener 409 in a bifurcated manner and are fixed to the respective thigh belts 402A, 402B.

In the fourth embodiment, the harness-type safety belt 400 includes a pair of thigh belts 402A and 402B with stretchable members 420A and 420B, a back belt 403 with a stretchable member 430, and a back belt (not shown). The connecting belts 404A and 404B are provided with stretchable members 440A and 440B that do not stretch.

Please refer to FIG. FIG. 16A is a side view showing an example of elastic members 420A and 420B, (b) an elastic member 430, and (c) an elastic member 440A and 440B according to the present invention. As shown in FIG. 16A, the elastic member 420A includes a bellows portion 421A and a binding portion 422A. The bellows portion 421A and the binding portion 422A basically have the same configuration as the bellows portion 221A and the binding portion 222A of the second embodiment. The elastic member 420B is the same as the elastic member 420A. In this way, by providing the thigh belts 402A and 402B with the stretchable members 420A and 420B, respectively, the thigh belts do not bite into the thighs when the user twists the body from side to side or squats down. It is possible to suppress situations that give pleasure.

Referring to FIG. 16B, the elastic member 430 includes a bellows portion 431 having a bellows structure that expands and contracts in the longitudinal direction at the center, and binding portions 432 that are attached to both ends of the bellows portion 431 and connected to the back belt 403 . I have.

Referring to FIG. 16C, the elastic members 440A and 440B are bellows portions 441A and 441B having a bellows structure that expands and contracts in the longitudinal direction at the center, and are attached to both ends of the bellows portions 441A and 441B and connected to the back belt 403. Bind portions 442A and 442B are provided. Thus, by providing the connecting belts 404A and 404B with the elastic members 440A and 440B, it is possible to correct the phenomenon that the belt of the harness is stretched and the belt digging into the thigh when the user squats down.

As described above, the elastic members 420A, 420B, 430, 440A, and 440B have the same configuration and arrangement as the elastic members 220A, 220B, 130, 340A, and 340B described above. Therefore, a detailed explanation is omitted.

The elastic member 430 of the harness-type safety belt 400 has an upper end at the position of the upper belt fastener 408 on the back belt 403, and a lower end at the position of the connecting portion between the pair of connecting belts 404A and 404B and the pair of thigh belts 402A and 402B. is provided in an area where the ratio of the distance from the lower end to the distance from the lower end to the upper end is within 53%. By providing the elastic member 430 in this area, the safety of the harness-type safety belt 400 is improved in the area where expansion/contraction is not required, and the feeling of crampedness during wearing can be reduced in the area where the back belt 403 needs to be expanded/contracted.

Further, the elastic member 430 provided on the back belt 403 is configured to be able to extend the back belt 403 by 10% to 18% in the direction in which the back belt 503 extends. By extending the stretchable member 430 within this range, the safety of the harness-type safety belt 400 is improved, and the cramped feeling when worn can be reduced.

[effect]
Prior to explaining the effects of this embodiment, trends in conventional harness-type safety belts will be described with reference to FIGS. 17A, 17B, and 18A to 18C. 17A and 17B are diagrams showing how the back belt and the thigh belt ride up due to physical movement of a user wearing a conventional harness. FIG. 17A shows a state in which the user O wears a conventional harness and stands straight. A user O wears the shoulder belt 1, the back belt 3, and the thigh belt 2 by tightening them. FIG. 17B shows a state in which the user O is working while slouching forward. When the user lengthens and loosens each belt, the back belt is pulled up when the user bends forward, and the thigh belt connected to the back belt rides up above the thigh for comfort. There is a problem that it interferes with the work activity.

In this case, since each belt is tightly tightened around the body, the back belt 3 rides up in the direction of the arrow, that is, upwards, when the user bends forward. Then, the thigh belt 2 connected to the back belt 3 is also pulled up in the direction of the arrow. That is, either the thigh belt 2 digs into the user's O thigh or the shoulder belt 1 digs into the user's O shoulder.

18A shows a standing state, FIG. 18B shows a crouched state, and FIG. 18C shows a squatting state. As shown in FIG. 18B, when a person leans forward, the back becomes rounded. That is, the thick line portion B extends. Also, as shown in FIG. 18C, when a person squats down, the thighs and buttocks are rounded, so the thick line portion H extends. In other words, it can be confirmed that the belt of the harness needs to be contracted in the area from the buttocks to the thighs when the person changes from the bent state to the crouched state.

As shown above, the back belt or thigh belt rides up due to regular or irregular physical movement. The resulting upward force of the back belt can be suppressed by the thigh belt attached to the thigh, but on the contrary, it restricts the free movement of the body and significantly reduces the wearing comfort. That's what it means.

On the other hand, in the above-described embodiment, each of the shoulder belt, the thigh belt, the connecting belt, and the back belt, or any combination of them, is provided with a stretchable and stretchable member. According to such a configuration, in order to allow the wearer to wear it properly on the body, the burden during work is reduced by reducing the cramped feeling given when the wearer wears it. Therefore, it is possible to improve the degree of close contact with the body when worn, which has the effect of reducing fall accidents.

In the conventional harness-type safety belt, there is a fear that wearing the harness-type safety belt is avoided due to the feeling of tightness when worn. In fact, there were situations where safety belts that were not full harnesses or safety belts themselves were not worn. On the other hand, the harness-type safety belt of this embodiment reduces the cramped feeling that is given when worn, so it is possible to promote the wearing of full harnesses and improve the wearing rate of full harnesses. is.

In addition, the harness-type safety belt can also serve as a suspender for work clothes worn on the lower body. It is possible to achieve the above effect without

In addition, the appropriate length of the elastic member obtained from the demonstration experiment maximized the functionality of the harness and ensured safety. Therefore, the harness-type safety belt according to the above embodiment is easy to move, and has the effect of greatly reducing the risk of being caught by other structures or the like.

[Modification]
As described at the beginning of the first embodiment, the first to fourth embodiments and the modified examples and additional embodiments described in each description are one of the various forms of a full harness called a Y-shaped harness. is shown. However, these Embodiments 1 to 4 and the modified examples and additional embodiments described in each description are not limited to these, and can be applied to various full harnesses such as other Y-shaped harnesses, X-shaped harnesses, and H-shaped harnesses. It is possible. The following outlines the basic configuration of various full harnesses such as other Y-type harnesses, X-type harnesses, and H-type harnesses.

[Y type modification]
FIG. 19 is a rear view showing a state in which a user wears a harness according to the Y-shaped modification. As shown in FIG. 19, the harness-type safety belt 300Y includes shoulder belts 301AY and 301BY, thigh belts 302AY and 302BY, a back belt 303Y, connecting belts 304AY and 304BY, a D ring 307Y, and an upper belt fastener. 308Y, a lower belt fastener 309Y, and chest belts 312AY and 312BY. In the harness-type safety belt 300Y, a major difference from the above embodiment is that the shoulder belt is not integrated with the back belt 303Y but is separated and connected via the upper belt fastener 308Y. In addition, the back belt 303Y is not integral with the connecting belts 304AY and 304BY but separated, and connected via the lower belt fastener 309Y.

The upper belt fastener 308Y and the lower belt fastener 309Y are formed with two long holes for belt passage spaced vertically. The shoulder belts 301AY and 301BY are passed through and crossed through the elongated holes on the upper side of the upper belt fastener 308Y. In the example of FIG. 19, the shoulder belts 301AY and 301BY are shown bifurcated to the user's right shoulder side and left shoulder side through the upper long hole of the upper belt fastener 308Y. ing. Also, in the example of this figure, the shoulder belts 301AY and 301BY are one belt. In addition, shoulder belts 301AY and 301BY are sewn at the folded portion at the upper long hole of upper belt fastener 308Y, and are fixed in position relative to the whole and back belt 303Y. One end of the back belt 303Y is folded back through the long hole on the lower side of the upper belt fastener 308Y and sewn at a position slightly closer to the lower belt fastener 309Y.

Furthermore, the back belt 303Y is passed through the long hole on the upper side of the lower belt fastener 309Y. The other end of the back belt 303Y is folded back through a long hole on the upper side of the lower belt fastener 309Y and passed through a belt adjuster provided on the side of the upper belt fastener 308Y. Upper ends of the connecting belts 304AY and 304BY are passed through the lower elongated holes of the lower belt fastener 309Y.

In this Y-shaped modification, the connection belts 304AY and 304BY of the harness-type safety belt 300Y are provided with stretchable members 340AY and 340BY, respectively. In the harness-type safety belt 300Y, the thigh belts 302AY and 302BY are provided with stretchable members 320AY and 320BY. The structure, arrangement position, etc. of these expandable members are the same as the structure of the third embodiment. Therefore, each additional embodiment and modification of the third embodiment can be applied to this Y-shaped modification.

[X type modification]
FIG. 20A is a schematic front view showing a harness according to an X-shaped modification. As shown in FIG. 20A, the harness-type safety belt 300X includes shoulder belts 301AX, 301BX, thigh belts 302AX, 302BX, back belts 3031X, back belts 3032X, connecting belts 304AX, 304BX, and D rings (not shown). ), upper belt fasteners 308X, lower belt fasteners 3091X, 3092X, and chest belts 312AX, 312BX. In the harness-type safety belt 300X, the common point with the above-described Embodiments 1 to 4 is that the shoulder belt 301AX is a single belt integrally formed with the back belt 3031X and the connecting belt 304BX. 301BX is another belt integrally formed with the back belt 3021X and the connecting belt 304AX.

As a different point, in the above-described Embodiments 1 to 4, the back belts overlap in the user's front-back direction, but in the X-shaped modification, the left and right (the user's left-right direction is as a reference). In addition, a connection belt is provided to bridge between the two back belts. This is provided at a position slightly below the upper belt fastener 308X (based on the direction of the head and feet of the user) and substantially behind the chest of the user.

Also, the shoulder belt 301AX and the back belt 3031X are held in relative position by a lower belt fastener 3091X. Unlike Embodiments 1 to 4, this lower belt fastener 3091X is provided at a position corresponding to the right side of the waist of the user or a position above or below it. Similarly, the shoulder belt 301BX and the back belt 3032X are held in relative position by a lower belt fastener 3092X. This lower belt fastener 3092X is provided at a position corresponding to the left side of the waist of the user or a position adjacent above or below it.

In this X-type modification, the connection belts 304AX and 304BX of the harness-type safety belt 300X are provided with stretchable members 340AX and 340BX, respectively. In the harness-type safety belt 300X, the thigh belts 302AX and 302BX are provided with stretchable members 320AX and 320BX. The structure, arrangement position, etc. of these expandable members are the same as the structure of the third embodiment. Therefore, each additional embodiment and modification of the third embodiment can be applied to this X-shaped modification. The X-shaped modification includes a shape in which the thigh belt is inclined upward toward its lateral side (position corresponding to the ilium side of the user) as shown in FIG. 20B.

[H type modification]
FIG. 21 is a schematic rear view showing a harness according to an H-shaped modification. As shown in FIG. 21, the harness-type safety belt 300H includes shoulder belts 301AH and 301BH, thigh belts 302AH and 302BH, a back belt 3031H, a back belt 3032H, a D ring 307H, an upper belt fastener 308H, Chest belts 312AH and 312BH are provided. The harness-type safety belt 300H has many points in common with the X-shaped harness-type safety belt 300X. For example, the shoulder belt 301AH is one belt formed integrally with the back belt 3031H and the connecting belt 304BH, and similarly the shoulder belt 301BH is formed integrally with the back belt 3021H and the connecting belt 304AH. It is one belt of

Further, like the X-shaped harness-type safety belt 300X, the H-shaped modified example is also branched to the left and right (based on the left-right direction of the user) via the upper belt fastener 308H. In addition, both back belts are also common in that a connection belt is provided so as to be stretched between the two back belts. However, since the diverging angle of the back belt is small, unlike the X-shaped harness type safety belt 300X, the back belt and the shoulder belt do not cross, and the lower belt fastener like the X-shaped harness type safety belt 300X does not cannot be established. Also, in the above embodiments 1 to 4, the connection belt and the back belt are conceptually distinguished, but in the H-shaped harness-type safety belt 300H, the back belt is directly connected to the thigh belt, No connecting belt is defined.

In this H-type modification, the position of the harness-type safety belt 300H on the back belt from the buttocks to the thighs of the user (the position corresponding to the connection belt in the other example above) is provided with a stretchable elastic member 340AH. , 340BH.In the harness-type safety belt 300H, the thigh belts 302AH, 302BH are provided with elastic members 320AH, 320BH. The configuration is similar to that of Embodiment 3. Therefore, each additional embodiment and modification of Embodiment 3 can be applied to this H-type modification.

Also, in the Y-shaped harness, it is possible to adopt a configuration in which the back belt and the shoulder belt are reversed in the front-rear direction.

[Other Modifications]
FIG. 22 is a rear view showing an outline of a harness according to another modified example. As shown in FIG. 22, the harness-type safety belt 300A includes shoulder belts 301Aα and 301Bα, thigh belts 302Aα and 302Bα, a back belt 303α, connecting belts 304Aα and 304Bα, a D ring 307α, and an upper belt fastener. 308α and chest belts 312Aα and 312Bα. The major difference between the harness-type safety belt 300α and the above-described embodiment is that a portion of the lower side of each shoulder belt is connected to a portion of each corresponding connecting belt. Although the connecting belts are formed integrally, they are not integrated with the back belt 303α, but are separated from each other, and are connected at the lower end of the back belt. The functions, arrangement, etc. of other parts are the same.

From the above embodiment, the harness-type safety belt can have the following features.

[Appendix 1]
a shoulder belt passing through the shoulders of the user and extending downward from both shoulders on the front side of the user;
a thigh belt directly or indirectly connected to one end of the shoulder belt;
A harness-type safety belt comprising a back belt integrally formed with or connected to the shoulder belt and extending downward on the back side of the user,
A harness-type safety belt, wherein a stretchable stretchable member is disposed on the pair of shoulder belts, the pair of thigh belts, or the back belt.
[Appendix 2]
The harness-type safety belt according to appendix 1, wherein each of the back belt and the thigh belt is provided with an elastic member.
[Appendix 3]
A connecting belt connected from the lower end of the back belt to the thigh belt via a lower belt fastener,
The harness-type safety belt according to appendix 1, wherein each of the connecting belt and the thigh belt is provided with a stretchable and stretchable member.
[Appendix 4]
The harness-type safety belt according to appendix 3, further comprising a stretchable stretchable member disposed on the back belt.
[Appendix 5]
5. The harness-type safety belt according to any one of Appendices 1 to 4, wherein the elastic member includes an elastic belt.
[Appendix 6]
The stretchable member has an elastic belt passed through the tube of the hollow tubular body, and the hollow tubular body forms wrinkles in the longitudinal direction. The harness-type safety belt according to any one of appendices 1 to 4, characterized by:
[Appendix 7]
The expandable member includes a bellows portion having a bellows structure that expands and contracts in the longitudinal direction at the center, and binding portions that are bound to both ends of the bellows portion,
The bellows portion is formed by weaving a plurality of elastic threads in the longitudinal direction of a belt-shaped body including a first layer and a second layer woven with non-stretchable yarns,
On the first layer side of the belt-shaped body, a plurality of locations where the first layer of the elastic thread is sewn are provided in the length direction of the belt-shaped body,
On the second layer side of the belt-shaped body, the second layer sewing points are provided at a plurality of locations in the length direction of the belt-shaped body,
In the longitudinal direction of the band-shaped body, the first layer sewing points and the second layer sewing points are arranged alternately,
5. Any one of Supplementary Notes 1 to 4, wherein the woven elastic thread is sewn in the width direction of the belt-like body at the first layer side attachment point and the second layer sewing point. Harness type safety belt described in .
[Appendix 8]
8. The harness-type safety belt according to appendix 6 or 7, wherein the bellows portion regulates the maximum extension length of the stretchable member.
[Appendix 9]
When the position of the upper belt fastener on the back belt is defined as the upper end, and the boundary portion between the connecting belt and the thigh belt is defined as the lower end, the elastic member has a distance from the lower end to the distance from the lower end to the upper end. 9. The harness-type safety belt according to any one of Appendices 1 to 8, which is provided in an area where the ratio of the distance is within 53%.
[Appendix 10]
When the position of the upper belt fastener on the back belt is defined as the upper end, and the boundary portion between the connecting belt and the thigh belt is defined as the lower end, the elastic member has a distance from the lower end to the distance from the lower end to the upper end. 9. The harness-type safety belt according to any one of Appendices 1 to 8, which is provided in a region where the distance ratio is 27% to 53%.
[Appendix 11]
11. The harness-type safety belt according to any one of Appendices 1 to 10, wherein the stretchable member disposed on the connecting belt or the back belt is configured to be able to stretch the belt by 10% to 18% in the direction in which the belt extends. .
[Appendix 12]
The elastic member arranged on the connecting belt or the back belt has a static load of 5N to 25N required to stretch by 45mm, and a static load of 30N to 50N required to stretch by 120mm. 12. The harness type safety belt according to any one of 11.
[Appendix 13]
The elastic member disposed on the connecting belt or the back belt has a static load F (N) required to extend the length ΔL (mm) in the range of 45 mm to 120 mm according to the following formula (1). 13. A harness-type safety belt according to any one of Appendices 1 to 12 which satisfies.
[Number 1]
ΔL/3−10≦F≦ΔL/3+10 Expression (1)
[Appendix 14]
14. The harness-type safety belt according to any one of Appendices 1 to 13, wherein the elastic members arranged on the pair of thigh belts are arranged on the buttock side of the user.
[Appendix 15]
The elastic member comprises an elastic member capable of elastic deformation,
15. The harness-type safety belt according to any one of Appendices 1 to 14, wherein the elastic member is composed of a plurality of linear members.
[Appendix 16]
The elastic member comprises an elastic member capable of elastic deformation,
16. The harness-type safety belt according to any one of Appendices 1 to 15, wherein the elastic members are composed of seven linear members having an outer diameter of 0.5 mm.

While the preferred embodiment of the harness-type safety belt according to the invention has been illustrated and described, it will be appreciated that various modifications can be made without departing from the scope of the invention.

The harness-type safety belt according to the present invention reduces the burden during work without giving a cramped feeling when it is worn, so that it can be worn properly on the body, thereby reducing the number of fall accidents by promoting an improvement in the wearing rate. Also, it can be widely used as a tool that contributes to a significant reduction in the casualty rate in accidents. Furthermore, it can be diverted not only as a harness-type safety belt for construction sites, but also as a harness-type safety belt for fall prevention as mountain equipment.

１００ ２００ ３００ ４００ ５００ ハーネス型安全帯１３０ ２３０ ４３０ 伸縮部材２２０ ３２０ ４２０ ５２０Ａ ５２０Ｂ 伸縮部材３４０ ４４０ 伸縮部材１０１Ａ １０１Ｂ ２０１Ａ ２０１Ｂ ３０１Ａ ３０１Ｂ ４０１Ａ ４０１Ｂ ５０１Ａ ５０１Ｂ 肩かけベルト１０２Ａ １０２Ｂ ２０２Ａ ２０２Ｂ ３０２Ａ ３０２Ｂ ４０２Ａ ４０２Ｂ ５０２Ａ ５０２Ｂ 腿ベルト103 203 303 403 Back belt 104A 104B 204A 204B 304A 304B 404A 404B Connection belt 107 207 307 407 507 D-ring 108 208 308 408 508 Upper belt fastener 109 209 309 Lower belt fastener 409 509

Claims (5)

a shoulder belt passing through the shoulders of the user and extending downward from both shoulders on the front side of the user;
a thigh belt directly or indirectly connected to one end of the shoulder belt;
a back belt integrally formed with or connected to the shoulder belt and extending downward on the back side of the user;
A lifeline connecting portion provided on the back belt side and connected to a lifeline;
A harness-type safety belt comprising
A stretchable stretchable member is provided on a portion of the thigh belt, and a stretchable stretchable member is provided on a portion of the back belt facing at least one of the user's buttocks and thighs,
parts of the thigh belt and the back belt other than the stretchable part are made of a non-stretchable belt,
A harness-type safety belt , wherein the elastic member is arranged on the back side of the user. a shoulder belt passing through the shoulders of the user and extending downward from both shoulders on the front side of the user;
a thigh belt directly or indirectly connected to one end of the shoulder belt;
a back belt integrally formed with or connected to the shoulder belt and extending downward on the back side of the user;
A connection belt integrally formed with or connected to the lower end side of the back belt, connected to the thigh belt, and extending downward facing at least one of the buttocks and thighs of the user. When,
A lifeline connecting portion provided on the back belt side and connected to a lifeline;
A harness-type safety belt comprising
At least one of a portion of the thigh belt and a portion of the connecting belt is provided with a stretchable member,
parts other than the stretchable part of the thigh belt and the connecting belt are made of a non-stretchable belt,
A harness-type safety belt , wherein the elastic member is arranged on the back side of the user. The connecting belt is connected to the thigh belt from the lower end of the back belt via a lower belt fastener,
3. The harness-type safety belt according to claim 2, wherein each of the connecting belt and the thigh belt is provided with the elastic member. a pair of shoulder belts extending crosswise upward from the user's upper back, passing through the user's shoulders, and extending downward from the user's front side from both shoulders;
a pair of thigh belts attached to one end of the pair of shoulder belts;
a back belt extending downward to correspond to the center of the user's back through an upper belt clasp to which the shoulder belts are cross-attached;
A pair of connecting belts extending from the lower end of the back belt through a lower belt fastener and bifurcated and connected to the pair of thigh belts;
A lifeline connecting portion provided on the back belt side and connected to a lifeline;
A harness-type safety belt comprising
Disposing a stretchable stretchable member on at least one of a portion of the pair of thigh belts and a portion of the connecting belt,
Parts other than the stretchable part of the thigh belt and the connecting belt are composed of a non-stretchable belt,
A harness-type safety belt , wherein the elastic member is arranged on the back side of the user. In the elastic member, the static load F (N) required to extend the length ΔL (mm) in the range of 45 mm to 120 mm satisfies the following formula: ΔL / 3-10 ≤ F ≤ ΔL / 3 + 10
The harness-type safety belt according to any one of claims 1 to 4.

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