Human body support device and falling prevention tool

Abstract

To provide a human body support device that provides an assist force gradually acting according to a motion of a worker during work, can assist natural operation of the worker, and has a simpler configuration, and provide a falling prevention tool.SOLUTION: A human body support device 1 is configured such that: a tension spring has a first tension spring part 31 and a second tension spring part 71 connected in series; in the tensile spring, when the entire tension spring is tensioned and a length of the second tension spring part 71 becomes a predetermined length, stretching is restricted such that the length does not become longer than the predetermined length and stretching of the second tensile spring part 71 stops; and furthermore, when the entire tension spring is tensioned, the first tension spring part 31 stretches.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a human body support device and a fall prevention device.

Background Art

[0002] Conventionally, in the fields of transporting objects and caring for the elderly, auxiliary devices for reducing the burden on workers during work are known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above auxiliary device, the assist for reducing the burden on the worker during work is unnatural, causing discomfort to the user during use, and there has been a demand for performing work with a natural assist. In addition, there has been a demand for reducing the manufacturing cost of the auxiliary device with a simpler configuration.

[0005] An object of the present invention is to provide a human body support device and a fall prevention device in which an assist force acts gently in accordance with the movement of the worker during work, enabling support for the natural movement of the worker, and having a simpler configuration.

Means for Solving the Problems

[0006] The present invention includes a back belt disposed along the vertical direction of the back of a user, a tension spring worn on the lower limbs of the user, and a connecting member connecting the back belt and the tension spring. The connecting member branches into two, a left connecting portion and a right connecting portion, at a position closer to the lower limbs of the user. The tension spring has a left tension spring disposed on the rear side of the left foot and a right tension spring disposed on the rear side of the right foot. The left connecting portion is connected to the left tension spring, and the right connecting portion is connected to the right tension spring. The tension spring has a first tension spring portion and a second tension spring portion connected in series. In the tension spring, when the entire tension spring is pulled and the second tension spring portion reaches a predetermined length, the elongation of the second tension spring portion is restricted so as not to extend beyond the predetermined length, and further, when the entire tension spring is pulled, the first tension spring portion elongates. The present invention relates to a human body support device.

[0007] It is preferable that the left connecting portion and the left tension spring are connected by being sewn together with a straight seam formed in a direction orthogonal to the expansion and contraction direction of the left tension spring, and the right connecting portion and the right tension spring are connected by being sewn together with a straight seam formed in a direction orthogonal to the expansion and contraction direction of the right tension spring.

[0008] The connecting member and the tension spring are covered with a sheet for reinforcing the connection by sewing, so that the front and back surfaces of the end portion of the tension spring are covered to form a covering portion of the end portion of the tension spring. It is preferable that the end portion of the connecting member and the covering portion of the end portion of the tension spring are connected by being sewn together so as to be overlapped and penetrated.

[0009] It is preferable that the back belt is locked to the ends of the upper body wearing belts respectively worn on the left and right shoulders of the user. It is preferable that the upper end portion of the back belt and the lower end portions of the upper body wearing belts respectively worn on the left and right shoulders of the user are connected by a belt connecting member. The first tension spring portion is preferably made of flat rubber.

[0010] The second tension spring part is composed of flat rubber covered by a cover member formed by braiding a first wire and a second wire in an intersecting positional relationship. It is preferable that the cover member restricts the flat rubber from stretching beyond the predetermined length when the flat rubber is pulled to the predetermined length.

[0011] It is preferable that the spring constant of the first tension spring part in the initial state is 1 time or more and 8 times or less the spring constant of the second tension spring part in the initial state.

[0012] The first tension spring part and the second tension spring part are composed of flat rubber of the same material. In the direction orthogonal to the direction in which the first tension spring part and the second tension spring part are connected in series, it is preferable that the cross-sectional area of the flat rubber of the first tension spring part is larger than that of the second tension spring part.

[0013] The displacement amount by which the second tension spring part extends when pulled with a predetermined force is preferably the same as or larger than the displacement amount by which the first tension spring part extends when pulled with the predetermined force. The first tension spring part is preferably disposed so as to straddle the upper and lower sides of the portion of the buttocks that protrudes most rearward when the user bends forward.

[0014] The present invention also relates to a fall prevention device including the human body support device according to any one of the above.

Effect of the Invention

[0015] According to the present invention, an assist force acts gently in accordance with the movement of the worker during work, enabling support for the natural movement of the worker, and it is possible to provide a human body support device and a fall prevention device having a simpler configuration.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In the following description, when the user P is in a state of wearing the body support device 1 and standing upright, the front side in the front-back direction as viewed from the user P is defined as the front side, the right side and the left side in the left-right direction are defined as the right side and the left side respectively, and the upper side and the lower side in the up-down direction are defined as the upper side and the lower side respectively for explanation.

[0018] As shown in FIG. 1, FIG. 2, etc., the body support device 1 includes a tension spring composed of a first tension spring portion 31 and a second tension spring portion 71, a back belt 51, and a connecting member 52.

[0019] The upper end portion of the back belt 51 is connected and locked to the central end portion of the connecting belt 22 via a length-adjustable adjuster 311 and a ladder lock 312. The adjuster 311 and the ladder lock 312, together with a part of the back belt 51, are covered by a cover (not shown) and are not directly exposed outside the cover.

[0020] The left and right end portions of the connecting belt 22 are respectively connected to the upper portions of the shoulder belts 21. The lower end portion of the back belt 51 branches into two, a left connecting portion and a right connecting portion, at a position closer to the lower limbs of the user P than the back belt 51, and is connected continuously and integrally by belts of the same material to a connecting member 52 disposed at a position facing the lumbar portion above the upper end of the sacrum of the pelvis. Thereby, the back belt 51 is disposed along the up-down direction of the back on the back of the user P. The shoulder belts 21 and the connecting belt 22 constitute an upper body wearing belt that is respectively worn on the left and right shoulders of the user P.

[0021] The substantially central portion of the middle belt 23 is fixed to the lower portion of the shoulder belt 21. One end portions of the left and right middle belts 23 are connected by a buckle 231 on the front side of the user P. The other end portions of the left and right middle belts 23 are respectively passed through and connected to a pair of slits 411 formed in the upper portion of the main body 41 of the belt locking member 40 by using ladder locks 232.

[0022] The middle part between the upper end and the lower end of the back belt 51 is disposed in a vertically extending groove 43 that is the central part of the main body 41 of the belt locking member. The lower ends of the respective two branched connecting members 52 of the left connecting part and the right connecting part are respectively sewn and connected to the upper ends of a first tension spring part 31 (left first tension spring part) that constitutes a left tension spring disposed from the pelvis of the user P to the rear side of the left leg and the upper ends of a first tension spring part 31 (right first tension spring part) that constitutes a right tension spring disposed from the pelvis of the user P to the rear side of the right leg, thereby being connected and locked. As a result, the left first spring part is connected to the left connecting part of the connecting member 52 branched into two, the right first spring part is connected to the right connecting part of the connecting member 52 branched into two, and the connecting member 52 connects the back belt 51 and the first tension spring part 31 that constitutes the tension spring.

[0023] The lower ends of the left and right first tension spring parts 31 are respectively sewn and connected to the upper ends of a second tension spring part 71 that constitutes the left and right tension springs, thereby being connected and locked. As a result, in the left tension spring and the right tension spring that constitute the tension spring, the first tension spring part 31 and the second tension spring part 71 are connected in series. In FIGS. 1 and 3, for convenience of explanation, the second tension spring part 71 is shown in a simplified manner.

[0024] The lower ends of the left and right second tension spring parts 71 are respectively sewn and connected to the upper ends of the lower end belt 72, thereby being connected and locked. The lower end of the lower end belt 72 is connected to the rear part of the leg fixing member 81 via a length-adjustable adjuster 712 and an angle bracket 711. The leg fixing member 81 is wound around the lower side of the knee of the user P and fixed to the lower limbs of the user P.

[0025] As a result, the first tension spring part 31 and the second tension spring part 71 are worn on the left and right lower limbs of the user P. The second tension spring part 71 disposed on the rear side of the left leg constitutes a left second spring part, and the second tension spring part 71 disposed on the rear side of the right leg constitutes a right second spring part.

[0026] The upper ends of the woven rubber 61 are respectively passed through and connected to a pair of slits 413 formed in the lower part of the main body 41 of the belt locking member 40. The lower ends of the woven rubber 61 are sewn and connected to the rear part of the leg fixing member 81, which is the rear part of the leg fixing member 81 where the lower end of the second tension spring portion 71 is connected.

[0027] Next, the details of each part of the human body support device 1 will be described. As shown in FIGS. 7 and 9, when the user P bends forward, the entire tension spring composed of the first tension spring portion 31 and the second tension spring portion 71 is pulled. When the second tension spring portion 71 reaches a predetermined length, for example, when the total length of the second tension spring portion 71 including the displacement amount becomes 20 mm, the elongation of the second tension spring portion 71 is restricted so as not to extend beyond the predetermined length, and the elongation stops. Further, when the entire tension spring is pulled, only the first tension spring portion 31 is configured to extend.

[0028] Also, the spring constant of the first tension spring portion 31 in the initial state is 1 times or more and 8 times or less the spring constant of the second tension spring portion 71 in the initial state. Here, the "initial state" means a state in which no external force acts on the first tension spring portion 31 and the second tension spring portion 71. Therefore, the restoring force when the first tension spring portion 31 and the second tension spring portion 71 are pulled by the same length (same displacement amount) is the same for the first tension spring portion 31 and the second tension spring portion 71, or the first tension spring portion 31 is stronger than the second tension spring portion 71.

[0029] Also, the displacement amount of the second tension spring portion 71 when pulled by a predetermined force is the same as or larger than the displacement amount of the first tension spring portion 31 when pulled by the same predetermined force. And the second tension spring portion 71 has a regulating member that restricts it from extending beyond the predetermined length when it is pulled to the predetermined length. By being regulated in this way, only the first tension spring portion 31 extends after the second tension spring portion 71 has extended.

[0030] Specifically, the first tension spring portion 31 is constituted by a member that generates a restoring force that extends when pulled and attempts to return to its original elastic length. For example, a strip-shaped flat rubber having a predetermined width, a double-layered rubber tube, or a so-called McKibben-type artificial muscle in which gas (air) is enclosed inside an elastic tube to form a sealed space, etc. are used. In the present embodiment, a strip-shaped flat rubber having a predetermined width is used as the first tension spring portion 31.

[0031] The first tension spring portion 31 is disposed across the upper and lower sides of the portion of the buttocks that protrudes most posteriorly when the user P bends forward. Specifically, as shown in FIGS. 7 and 9, the upper end portion of the first tension spring portion 31 connected to the left connection portion of the bifurcated connecting member 52 and the upper end portion of the first tension spring portion 31 connected to the right connection portion of the connecting member 52 each extend downward from a position facing the lumbar portion above the upper end of the sacrum of the pelvis, pass through the portion of the buttocks that protrudes most posteriorly when the user P bends forward, and further extend downward to the user P. At the posterior side of the upper part of the thigh, the lower end portion of the first tension spring portion 31 is connected to the upper end portion of the second tension spring portion 71.

[0032] At the portion of the buttocks that protrudes most posteriorly when the user P bends forward, the first tension spring portion 31 is pressed strongly against the buttocks and stops moving up and down. Therefore, when the user P further bends forward, the portion of the first tension spring portion 31 above the portion of the buttocks that protrudes most posteriorly mainly extends. Therefore, as shown on the left side of FIG. 8, when the first tension spring portion 31 does not extend above the portion of the buttocks that protrudes most posteriorly, when the user P further bends forward, the user P receives strong pressure on the shoulders. However, in the present embodiment, since the portion of the first tension spring portion 31 above the portion of the buttocks that protrudes most posteriorly extends, such pressure is suppressed. On the other hand, the force of the tension spring by the portion of the first tension spring portion 31 below the portion of the buttocks that protrudes most posteriorly is felt by the user P as a reaction force that attempts to return from the state when the user P bends forward.

[0033] As shown in FIG. 3, the second tension spring portion 71 is, for example, a flat rubber made of the same material as the flat rubber constituting the first tension spring portion 31, and has the same spring constant as the flat rubber constituting the first tension spring portion 31 or a smaller spring constant than the flat rubber constituting the first tension spring portion 31. It is composed of a strip-shaped flat rubber 7101 and a cylindrical mesh sleeve 7102 as a cover member that covers the periphery of the flat rubber 7101.

[0034] When the flat rubber 7101 constituting the second tension spring portion 71 is configured to have a smaller spring constant than the flat rubber constituting the first tension spring portion 31, for example, in a direction orthogonal to the direction in which the first tension spring portion 31 and the second tension spring portion 71 are connected in series, the cross-sectional area of the flat rubber of the first tension spring portion 31 is configured to be larger than that of the second tension spring portion 71. Specifically, for example, flat rubbers with the same thickness are used to form the flat rubber of the first tension spring portion 31 and the flat rubber 7101 of the second tension spring portion 71, and the width and thickness of the flat rubber constituting the first tension spring portion 31 are made larger than the width and thickness of the flat rubber 7101 constituting the second tension spring portion 71.

[0035] When the spring constants of the flat rubber 7101 constituting the second tension spring portion 71 and the flat rubber constituting the first tension spring portion 31 are configured to be the same, the first tension spring portion 31 is configured by a portion on one end side of a single long flat rubber, and the second tension spring portion 71 is configured by a portion on the other end side of the flat rubber. The portion constituting the second tension spring portion 71 is inserted into the mesh sleeve 7102 to cover the second tension spring portion 71 with the mesh sleeve 7102, and the end portion of the mesh sleeve 7102 is sewn to the flat rubber 7101.

[0036] The mesh sleeve 7102 is configured by, for example, weaving a first wire material such as a high-tensile fiber with low stretchability and a second wire material in an intersecting positional relationship. When the two ends of the mesh sleeve 7102 are pulled in the direction in which they are separated, the mesh sleeve 7102 stretches by a predetermined amount together with the flat rubber 7101. However, when the predetermined amount of stretching is reached, the stretching stops and no further stretching occurs. Thus, the mesh sleeve 7102 constitutes a regulating member that regulates the stretching of the flat rubber 7101.

[0037] The connecting member 52 is configured not to stretch as compared with the first tension spring portion 31 and the second tension spring portion 71. Specifically, the connecting member 52 is constituted by, for example, a belt-like PP (polypropylene) tape.

[0038] The seam in the stitched portion between the lower end portions of the respective two branched connecting members 52, namely the left connecting portion and the right connecting portion, and the upper end portions of the first tension spring portions 31 (left first tension spring portion, right first tension spring portion) has a portion formed linearly in a direction orthogonal to the longitudinal direction of the first tension spring portion 31, which is the expansion and contraction direction of the left tension spring (the width direction of the first tension spring portion 31).

[0039] Specifically, as shown in FIG. 4, the seam 55 is formed in a rectangular shape, for example, and has a pair of linear portions extending in the width direction of the first tension spring portion 31 and a portion extending in the longitudinal direction of the first tension spring portion 31 and connecting these pair of linear portions to each other. Also, for example, as shown in FIG. 6, the seam 55 has a pair of linear portions extending in the width direction of the first tension spring portion 31 and a linear portion connecting the ends of these pair of linear portions to each other in a positional relationship with a tolerance. Similar seams are formed in the other stitched portions as well.

[0040] At the upper ends of the first tension spring portions 31 (left first tension spring portion, right first tension spring portion) sutured to the lower ends of the connecting member 52 branched into two, namely the left connecting portion and the right connecting portion, a covering portion is formed. As shown in FIG. 5, the covering portion is constituted by a sheet 54 formed in a C shape over the upper surface, end surface, and lower surface of the upper end portion of the first tension spring portion 31 so as to wrap the edge of the upper end portion of the first tension spring portion 31.

[0041] As the sheet 54, a sheet for reinforcing the connection by being sutured is used. For example, a Kraft (registered trademark) sheet having a tensile strength of 1300×900 N / 3 cm or more and a tear strength of 80×80 N or more is used. The covering portion at the upper end portion of the first tension spring portion 31 and the lower end portion of the connecting member 52 are overlapped and sutured so as to be penetrated by the suturing thread.

[0042] According to the above-described embodiment, the following effects can be exhibited. In the present embodiment, the connecting member 52 branches into two, namely the left connecting portion and the right connecting portion, at a position closer to the lower limbs of the user P. The tension springs include a left tension spring disposed on the rear side of the left leg and a right tension spring disposed on the rear side of the right leg. The left connecting portion is connected to the left tension spring, and the right connecting portion is connected to the right tension spring. The tension springs have a first tension spring portion 31 and a second tension spring portion 71 connected in series. In the tension spring, when the entire tension spring is pulled and the second tension spring portion 71 reaches a predetermined length, the elongation of the second tension spring portion 71 is restricted so as not to extend beyond the predetermined length. Further, when the entire tension spring is pulled, only the first tension spring portion 31 extends.

[0043] With this configuration, when the user P bends forward, such as when trying to lift a load, first, the second tension spring portion 71 extends and a weak restoring force acts on the user P. When the second tension spring portion 71 reaches a predetermined length, its extension is restricted so that it does not extend beyond the predetermined length, and the extension of the second tension spring portion 71 stops. Further, when the entire tension spring is pulled, only the first tension spring portion 31 extends, and a strong restoring force can act on the user P. As a result, the restoring force of the tension spring can be made such that when the user P is walking during work, a weak restoring force acts on the user P so as not to hinder the walking, and when the user P bends forward deeply, a strong restoring force can act on the user P. For this reason, it is possible to make the human support device 1 such that the assistive force acts gently in accordance with the movement of the user P during work, enabling support for the natural movements of the user P.

[0044] Also, by configuring the tension spring to have a first tension spring portion 31 and a second tension spring portion 71 connected in series and connecting them to the left connecting portion and the right connecting portion of the bifurcated connecting member 52, it is possible to reduce the number of parts related to the human support device 1 and reduce the manufacturing cost related to the human support device 1. Further, it is possible to generate a restoring force along the left and right legs of the user P, and it is possible to appropriately support the left and right legs of the user P.

[0045] Also, in the present embodiment, the left connecting portion and the left tension spring are connected by being sewn together with a straight seam 55 formed in a direction orthogonal to the expansion and contraction direction of the left tension spring, and the right connecting portion and the right tension spring are connected by being sewn together with a straight seam 55 formed in a direction orthogonal to the expansion and contraction direction of the right tension spring. With this configuration, when a strong force acts on the sewn portion, it is possible to reinforce this portion with the seam 55 and suppress the tearing of this portion.

[0046] In addition, in the present embodiment, the connecting member 52 and the tension spring are covered with a sheet 54 for reinforcing the connection by sewing, so that the front and back surfaces of the end portion of the tension spring are covered to form a covering portion of the end portion of the tension spring. The end portion of the connecting member 52 and the covering portion of the end portion of the tension spring are connected by being overlapped and sewn so as to penetrate each other. With this configuration, the portion sewn by the sheet 54 is reinforced, and it becomes possible to more reliably prevent this portion from tearing.

[0047] In addition, in the present embodiment, the upper end portion of the back belt 51 is connected to and locked to the central end portion of the connecting belt 22. With this configuration, it becomes possible to support the first tension spring portion 31 and the second tension spring portion 71 at appropriate positions via the back belt 51 and the connecting member 52.

[0048] In addition, in the present embodiment, the first tension spring portion 31 is made of flat rubber. Thereby, it becomes possible to configure a tension spring having a desired spring constant with a simple configuration. Further, by changing the width in the direction orthogonal to the longitudinal direction of the strip-shaped flat rubber, it becomes possible to easily change the cross-sectional area cut in the same direction.

[0049] In addition, in the present embodiment, the second tension spring portion 71 is composed of a flat rubber 7101 covered with a mesh sleeve 7102 as a cover member in which a first wire and a second wire in an intersecting positional relationship are woven. With this configuration, when the flat rubber 7101 is pulled to a predetermined length, the mesh sleeve 7102 can restrict the flat rubber 7101 from extending beyond the predetermined length. In the tension spring, when the entire tension spring is pulled and the second tension spring portion 71 reaches a predetermined length, the extension of the second tension spring portion 71 is restricted so that it does not extend beyond the predetermined length, and further, when the entire tension spring is pulled, only the first tension spring portion 31 extends. It becomes possible to easily realize the configuration.

[0050] In addition, in the present embodiment, the spring constant of the first tension spring portion 31 in the initial state is 1 to 8 times the spring constant of the second tension spring portion 71 in the initial state. With this configuration, in the tension spring, when the entire tension spring is pulled, both the first tension spring portion 31 and the second tension spring portion 71 can be configured to extend, or the second tension spring portion 71 can be configured to extend more than the first tension spring portion 31.

[0051] In addition, in the present embodiment, the first tension spring portion 31 and the second tension spring portion 71 are each made of flat rubber of the same material, and the cross-sectional area of the flat rubber in the direction orthogonal to the direction in which the first tension spring portion 31 and the second tension spring portion 71 are connected in series is larger in the first tension spring portion 31 than in the second tension spring portion 71. With this configuration, it is possible to easily realize a configuration in which the spring constant of the first tension spring portion 31 is larger than that of the second tension spring portion 71.

[0052] In addition, in the present embodiment, the amount of displacement by which the second tension spring portion 71 extends when pulled with a predetermined force is the same as or larger than the amount of displacement by which the first tension spring portion 31 extends when pulled with the same predetermined force. With this configuration, when the entire tension spring is pulled, when the second tension spring portion 71 reaches a predetermined length at an early stage, it is possible to configure the second tension spring portion 71 so that its extension is restricted and does not extend beyond the predetermined length.

[0053] In addition, in the present embodiment, the first tension spring portion 31 is disposed so as to straddle the upper and lower sides of the portion of the buttocks that protrudes most rearward when the user P bends forward. When the user P bends forward, the first tension spring portion 31 at the portion of the buttocks that protrudes most rearward is strongly pressed against the buttocks and stops moving up and down. At this time, when the user P further bends forward, the portion of the first tension spring portion 31 above the portion of the buttocks that protrudes most rearward can extend, and it is possible to suppress the pressure on the shoulders.

[0054] Next, a harness-type fall arrest device 100A having a human body support device 1A according to the second embodiment will be described. The human body support device according to the second embodiment forms part of the fall arrest device 100A. The configuration of the second tension spring portion 71A having the first tension spring portion 31A, the connecting member 52A, the flat rubber 7101A, and the mesh sleeve 7102A is the same as that of the second tension spring portion 71 having the first tension spring portion 31, the connecting member 52, the flat rubber 7101, and the mesh sleeve 7102 in the first embodiment. However, the configurations of the shoulder belts 21A-1, 21A-2, the connecting belts 22A-1, 22A-2, the leg fixing member 81A, etc. are different from those of the shoulder belt 21, the connecting belt 22, and the leg fixing member 81 in the first embodiment.

[0055] Further, the fall arrest device 100A is different from the human body support device according to the first embodiment in that it includes an upper pelvic belt 26A-1, an upper pelvic belt 26A-2, a lower pelvic belt 27A-1, and a lower pelvic belt 27A-2. Also, it is different from the human body support device according to the first embodiment in that a D-ring 313A as a belt connecting member is provided.

[0056] As shown in FIGS. 10 to 12 and the like, the human body support device 1A includes a tension spring composed of a first tension spring portion 31A and a second tension spring portion 71A, a back belt 51A, and a connecting member 52A. The fall arrest device 100A including the human body support device 1A has shoulder belts 21A-1, 21A-2, connecting belts 22A-1, 22A-2, a leg fixing member 81A, and the like.

[0057] As shown in FIG. 10, the upper end portion of the back belt 51A is hung and locked on the central linear portion 3132A of the D-ring 313A through an adjuster 311A. The back belt 51A passes under the D-ring 313A, and the lower end portion of the back belt 51A is connected to the upper end portion of the connecting member 52A via a ladder lock 312A.

[0058] The lower end of the connecting belt 22A-2 is hung on the upper curved portion 3131A of the D-ring 313A and extends leftward to become the left back belt 24A-1. The lower end of the left back belt 24A-1 is fixed and connected to a portion near the rear side of an adjuster 251A provided on the left side of the waist belt 25A that encircles the upper part of the pelvis and enables adjustment of the length of the waist belt 25A. Also, the lower end of the connecting belt 22A-1 is hung on the upper curved portion 3131A of the D-ring 313A so as to cover the lower end of the connecting belt 22A-2 and extends rightward to become the right back belt 24A-2. The lower end of the right back belt 24A-2 is fixed and connected to a portion near the rear side of an adjuster 251A provided on the right side of the waist belt 25A that encircles the upper part of the pelvis and enables adjustment of the length of the waist belt 25A.

[0059] The connecting belts 22A-1 and 22A-2 are respectively passed through slits 3141A formed in the D-ring stopper 314A and extend to the left and right shoulders of the user P. The upper ends of the connecting belts 22A-1 and 22A-2 are respectively connected to the upper ends of the shoulder belts 21A-1 and 21A-2 as shown in FIG. 11.

[0060] The lower ends of the shoulder belts 21A-1 and 21A-2 are respectively fixed to portions near the front side of an adjuster 251A provided on the left and right sides of the waist belt 25A that encircles the upper part of the pelvis and enables adjustment of the length of the waist belt 25A, and extend rearward to become the upper pelvic belts 26A-1 and 26A-2 respectively.

[0061] The rear part of the waist belt 25A is passed through the main body 41A of the belt locking member 40A. As shown in FIG. 11, the left and right end portions of the middle belt 23A are fixed and connected to the middle portions of the shoulder belts 21A-1 and 21A-2. The central portion of the middle belt 23A is connected by a buckle 231A on the front side of the user P. From the above, the upper end portion of the back belt 51A and the lower end portions of the connecting belts 22A-1 and 22A-2 connected to the shoulder belts 21A-1 and 21A-2 as the upper body wearing belts respectively worn on the left and right shoulders of the user P are connected by a D-ring 313A.

[0062] The lower end portions of the upper pelvic belts 26A-1 and 26A-2 are integrally connected and joined. The lower pelvic belts 27A-1 and 27A-2 respectively go around the roots of the left and right legs. The front portions of the lower pelvic belts 27A-1 and 27A-2 are respectively connected by buckles 271.

[0063] The substantially central portion of the back belt 51A is disposed at the central portion of the main body 41A of the belt locking member 40A. The lower end portion of the connecting member 52A branches into two, namely a left connecting portion and a right connecting portion, at a position closer to the lower limbs of the user P than the belt locking member 40A, and is disposed at a position facing the lumbar portion above the upper end of the sacrum of the pelvis. The connecting member 52A is continuously and integrally formed and connected by a belt of the same material. Thereby, the back belt 51A is disposed along the vertical direction of the back on the back of the user P. The shoulder belts 21A and the connecting belts 22A constitute upper body wearing belts respectively worn on the left and right shoulders of the user P.

[0064] The lower ends of the respective bifurcated connecting members 52A are sewn and connected to the upper end of the first tension spring portion 31A (left first tension spring portion) that forms the left tension spring disposed from the pelvis of the user P to the rear side of the left leg, and the upper end of the first tension spring portion 31A (right first tension spring portion) that forms the right tension spring disposed from the pelvis of the user P to the rear side of the right leg, respectively, thereby being connected and locked. As a result, the left first spring portion is connected to the left connecting portion of the bifurcated connecting member 52A, the right first spring portion is connected to the right connecting portion of the bifurcated connecting member 52A, and the connecting member 52A connects the back belt 51A and the first tension spring portion 31A that forms the tension spring.

[0065] The lower ends of the left and right first tension spring portions 31A are sewn and connected to the upper ends of the second tension spring portions 71A that form the left and right tension springs, one by one, respectively, thereby being connected and locked. As a result, in the left and right tension springs that form the tension spring, the first tension spring portion 31A and the second tension spring portion 71A are connected in series.

[0066] The lower ends of the left and right second tension spring portions 71A are sewn and connected to the upper end of the lower belt 72A, one by one, respectively, thereby being connected and locked. The lower end of the lower belt 72A is connected to the rear portion of the leg fixing member 81A via a length-adjustable adjuster 712A and an angle bracket 711A. The leg fixing member 81A is wound around the lower side of the knee of the user P and fixed to the lower limbs of the user P.

[0067] As a result, the first tension spring portion 31 and the second tension spring portion 71A are attached to the left and right lower limbs of the user P. The second tension spring portion 71A disposed on the rear side of the left leg forms the left second spring portion, and the second tension spring portion 71A disposed on the rear side of the right leg forms the right second spring portion. The left second spring portion is connected to the left connecting portion of the bifurcated connecting member 52A, and the right second spring portion is connected to the right connecting portion of the bifurcated connecting member 52A.

[0068] Next, the details of each part of the fall prevention device 100A having the human body support device 1A will be described. The first tension spring part 31A and the second tension spring part 71A are the same as the first tension spring part 31 and the second tension spring part 71 of the human body support device 1 of the first embodiment. When the user P bends forward, the entire tension spring constituted by the first tension spring part 31A and the second tension spring part 71A is pulled. When the second tension spring part 71A reaches a predetermined length, the elongation of the second tension spring part 71A is restricted so as not to extend more than the predetermined length, and the elongation stops. Further, when the entire tension spring is pulled, only the first tension spring part 31A is configured to extend. Regarding the spring constant of the first tension spring part 31A in the initial state being 1 times or more and 8 times or less the spring constant of the second tension spring part 71A in the initial state, it is the same as the spring constant of the first tension spring part 31 in the initial state of the first embodiment being 1 times or more and 8 times or less the spring constant of the second tension spring part 71 in the initial state.

[0069] According to the above-described embodiment, the following effects can be exhibited. In this embodiment, the upper end portion of the back belt 51 and the lower end portions of the shoulder belts 21A-1 and 21A-2, which are upper body wearing belts respectively worn on the left and right shoulders of the user P, are connected by a D-ring 313A as a belt connecting member. Thereby, the fall prevention device 100A having the human body support device 1A can be made into a harness-type safety belt for preventing a fall accident during high-altitude work at a construction site or the like.

[0070] The present invention is not limited to the above-described embodiment, and can be implemented in various forms within the scope described in the claims. For example, the configuration of each part of the human body support device and the fall prevention device is not limited to the configuration of each part of the human body support device 1 and the fall prevention device 100A.

[0071] For example, as the sheet 54, a Kraft (registered trademark) sheet was used, but it is not limited to this, and instead, other sheets for reinforcing the connection by sewing may be used. Also, the shape of the seam is not limited to the shape of the seam 55 in the present embodiment, and instead, a seam formed linearly in a direction orthogonal to the stretching direction of the tension spring may be used.

Explanation of Signs

[0072] 1, 1A Human body support device 21, 21A-1, 21A-2 Shoulder belt (upper body wearing belt) 31, 31A First tension spring part (tension spring) 40, 40A Belt locking member 52, 52A Connecting member 52, 52A Back belt 54 Sheet 55 Seam 71, 71A Second tension spring part (tension spring) 313A D-ring (belt connecting member) 7101 Flat rubber 7102 Mesh sleeve (cover member) P User

Claims

1. a back belt arranged along the vertical direction of the back on the back of the user; a tension spring worn on the lower limbs of the user; a connecting member connecting the back belt and the tension spring, wherein the connecting member branches into two, a left connecting portion and a right connecting portion, at a position closer to the lower limbs of the user, the tension spring has a left tension spring arranged at the rear side of the left foot and a right tension spring arranged at the rear side of the right foot, the left connecting portion is connected to the left tension spring, the right connecting portion is connected to the right tension spring, the tension spring has a first tension spring portion and a second tension spring portion connected in series, in the tension spring, when the entire tension spring is pulled and the second tension spring portion reaches a predetermined length, the elongation of the second tension spring portion is restricted so as not to extend beyond the predetermined length and the elongation stops, and further, when the entire tension spring is pulled, the first tension spring portion extends. A human body support device.

2. The left connecting portion and the left tension spring are connected by being sewn and joined in a straight line in a direction perpendicular to the expansion and contraction direction of the left tension spring. The human body support device according to claim 1, wherein the right connecting portion and the right tension spring are connected by being sewn and joined in a straight line in a direction perpendicular to the expansion and contraction direction of the right tension spring.

3. The connecting member and the tension spring are covered by a sheet for reinforcing the connection by sewing, and a covering portion of the end of the tension spring is formed by covering the front and back surfaces of the end of the tension spring. The human body support device according to claim 2, wherein the end of the connecting member and the covering portion of the end of the tension spring are connected by being sewn so as to be overlapped and penetrated.

4. The human body support device according to claim 1, wherein the back belt has the ends of the upper body wearing belts respectively worn on the left and right shoulders of the user locked thereto.

5. The human body support device according to claim 4, wherein the upper end portion of the back belt and the lower end portions of the upper body wearing belts respectively worn on the left and right shoulders of the user are connected by a belt connecting member.

6. The human body support device according to claim 1, wherein the first tension spring portion is made of flat rubber.

7. The second tension spring portion is made of flat rubber covered by a cover member formed by knitting a first wire and a second wire in an intersecting positional relationship. The human body support device according to claim 1, wherein the cover member restricts the flat rubber from stretching beyond the predetermined length when the flat rubber is pulled to the predetermined length.

8. The human body support device according to claim 1, wherein the spring constant of the first tension spring portion in the initial state is 1 to 8 times the spring constant of the second tension spring portion in the initial state.

9. The first tension spring portion and the second tension spring portion are formed of flat rubber of the same material. The cross-sectional area of the flat rubber in a direction orthogonal to the direction in which the first tension spring portion and the second tension spring portion are connected in series is larger for the first tension spring portion than for the second tension spring portion in the human body support device according to claim 1.

10. The displacement amount by which the second tension spring portion extends when pulled with a predetermined force is the same as or larger than the displacement amount by which the first tension spring portion extends when pulled with the predetermined force in the human body support device according to claim 1.

11. The first tension spring portion is disposed so as to straddle the upper and lower sides of the portion of the buttocks that protrudes most rearward when the user bends forward in the human body support device according to claim 1.

12. A fall prevention device including the human body support device according to any one of claims 1 to 11.

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