CN213259479U - Extension spring and human body supporting device - Google Patents

Abstract

The utility model provides an extension spring and human strutting arrangement realize extension spring's lightweight. In addition, the weight reduction and the simplification of the structure of the human body supporting device are realized. The tension spring (20) comprises: a line clamping unit (20B) to which a load is input; and an elastic tube (44) having a closed space for enclosing a gas therein, wherein the dimension in the pulling direction is increased and the dimension in the direction perpendicular to the pulling direction is decreased by the pulling wire fixing unit, and as a result, the volume in the closed space is decreased, the gas in the closed space is compressed, and the wire fixing unit (20B) generates a restoring force in the direction opposite to the pulling direction. In addition, the lumbar support device (10) comprises: thigh arms (16) and upper body side frames (18) worn by the user; and a tension spring (20) that is provided between the thigh arm (16) and the upper body side frame (18), and that is pulled by the upper body side frame (18) being displaced to one side relative to the thigh arm (16).

Description

Extension spring and human body supporting device

Technical Field

The utility model relates to an extension spring and human strutting arrangement.

Background

Patent document 1 listed below discloses a device (human body support device) for assisting a user in rising. The device described in this document includes a member 2 disposed on the back side of the user, a member 3 attached to the member 2 and supporting the upper body of the user, and a member 4 disposed along the thighs of the user and housing a tension spring 11 therein. Then, the members 2 and 3 swing with respect to the member 4, and the extension spring 11 is extended, thereby generating a supporting force in a direction of pulling up the upper body of the user.

Further, patent document 2 below discloses a lumbar support device (human body support device) that is worn by a user to support the waist of the user. The lumbar support device includes a back frame which is swingably attached to a pair of left and right side portions disposed on the side of the lumbar portion of the user and is worn on the back of the user. The lumbar support device further includes a lower limb frame which is swingably attached to the pair of left and right side portions and to which a thigh plate which abuts the thigh of the user is fixed. The lumbar support device further includes an artificial muscle having one end portion thereof locked to the back frame and the other end portion thereof locked to the lower limb frame via a wire. Then, compressed air is supplied from the compressor or the tank into the artificial muscle through the pipe, thereby contracting the artificial muscle. This applies a supporting force in the standing direction to the upper body of the user, and reduces the load on the waist of the user when lifting a heavy object.

Patent document 1: german patent application publication No. 102004008509(A1)

Patent document 2: japanese patent laid-open publication No. 2013-75078

However, the tension spring 11 constituting a part of the human body supporting apparatus described in patent document 1 is made of metal. Therefore, it is difficult to suppress an increase in weight of the human body support device configured to include the extension spring 11.

In addition, in a human body supporting device that is worn and used by a user like the human body supporting devices described in patent documents 1 and 2, weight reduction and simplification of the structure of the human body supporting device are desired from the viewpoints of reduction of a load on the user, ease of handling, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses consider above-mentioned fact to realize that extension spring's light weight is the 1 st purpose, with the lightweight and the simplification of structure that realize human strutting arrangement be the 2 nd purpose.

The extension spring according to claim 1 includes: a load input unit to which a load is input; and a gas enclosing section having a sealed space in which a gas is enclosed, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the gas in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section.

When the tension spring according to claim 1 is stretched, that is, when the load input portion is stretched, the gas enclosing portion deforms. Thereby, the dimension of the gas enclosing section in the stretching direction of the load input section increases. Further, when the dimension of the gas enclosing section in the stretching direction increases, the dimension of the gas enclosing section in the direction perpendicular to the stretching direction decreases, and as a result, the volume inside the gas enclosing section decreases. Here, in the tension spring according to claim 1, since the inside of the gas enclosing section is a closed space, when the volume of the inside of the gas enclosing section decreases, the gas inside the gas enclosing section is compressed. Thereby, a restoring force in a direction opposite to the stretching direction is generated in the load input portion. However, in the tension spring according to claim 1, the gas having a mass per unit volume that is lighter than that of a solid such as a metal is compressed, and thereby a restoring force in a direction opposite to the tension direction is generated in the load input portion. As a result, the extension spring can be reduced in weight as compared with an extension spring in which a restoring force is generated by deformation of a solid such as metal.

In the tension spring according to claim 2, in the tension spring according to claim 1, the gas-filled portion is covered with a cylindrical cover member, and when a dimension of the cylindrical cover member in the pulling direction increases, the dimension of the cylindrical cover member in a direction perpendicular to the pulling direction decreases.

When the tension spring according to claim 2 is stretched, the gas-filled portion deforms together with the cover member covering the gas-filled portion. That is, the dimensions of the gas-enclosing section and the cover member in the stretching direction increase. Here, as the dimension of the cover member in the stretching direction increases, the dimension of the cover member in the direction perpendicular to the stretching direction decreases. Thereby, the gas-sealed portion is pressed by the cover member, and the dimension of the gas-sealed portion in the direction perpendicular to the stretching direction is further reduced. As a result, the compressibility of the gas in the gas encapsulation section with respect to the amount of deformation of the gas encapsulation section in the stretching direction can be improved.

In the tension spring according to claim 3, in the tension spring according to claim 1, an amount of gas sealed in the sealed space in advance is adjustable.

According to the tension spring described in claim 3, the restoring force generated at the load input portion of the tension spring can be adjusted by adjusting the amount of the gas sealed in the sealed space in advance in the gas sealed portion.

The extension spring according to claim 4 includes: a load input unit to which a load is input; and a gas enclosing section having a sealed space enclosing a gas therein, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the fixed mass of the gas enclosed in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section, and wherein when both ends of the gas enclosing section are pulled toward the sides away from each other, the dimension of the gas enclosing section in the direction perpendicular to the pulling direction is reduced as a whole, thereby decreasing the volume, and the enclosed fixed mass of the gas is compressed, thereby generating the restoring force.

Technical means 5 is a human body supporting device having: a1 st wearing part and a2 nd wearing part, which are worn by a user; and an extension spring that is provided between the 1 st wearing part and the 2 nd wearing part and is pulled by displacing the 2 nd wearing part to one side with respect to the 1 st wearing part, the extension spring including: a load input unit to which a load is input; and a gas enclosing section having a sealed space in which a gas is enclosed, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the gas in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section.

In the body support apparatus according to claim 6, in the body support apparatus according to claim 5, the 1 st wearing part is a leg wearing part to be worn on the leg of the user, and the 2 nd wearing part is an upper body wearing part to be worn on the upper body of the user, and the user displaces the upper body wearing part with respect to the leg wearing part by tilting forward.

According to the human body supporting device described in claim 6, when the upper body of the user wearing the human body supporting device is tilted forward, the tension spring provided between the upper body wearing part and the leg wearing part is stretched. The restoring force of the extension spring is transmitted to the upper body of the user via the upper body wearing part, thereby generating a supporting force for the upper body of the user.

The human body supporting device of claim 7 comprises: a pair of left and right base parts disposed on the lateral side of the waist of the user; a waist belt attached to the base portion and worn around the waist of the user; a leg-wearing unit that is worn on the leg of the user and is swingably attached to the base unit; an upper body wearing unit that is worn on the upper body of the user and is attached to the base unit so as to be swingable; and a tension spring having a load input portion to which a load is input and a gas enclosing portion having a sealed space enclosing a gas therein, wherein the load input portion increases a dimension in a pulling direction and decreases a volume in the sealed space when the load input portion is pulled, and the gas of a fixed mass enclosed in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input portion, wherein the tension spring decreases the dimension of the gas enclosing portion in a direction perpendicular to the pulling direction as a whole by pulling both ends of the gas enclosing portion to sides away from each other, decreases the volume, and compresses the enclosed gas of the fixed mass, thereby generating the restoring force, and wherein the user displaces the upper body attachment portion with respect to the leg attachment portion by tilting forward, at the same time, the load input portion is pulled, and a supporting force in a direction of pulling up the upper body of the user is generated.

The human body supporting apparatus according to claim 8 is the human body supporting apparatus according to claim 7 or 8, wherein a valve is provided to adjust an amount of the gas sealed in the sealed space in advance.

The human body supporting device according to claim 9 comprises: a1 st wearing part and a2 nd wearing part, which are worn by a user; and the extension spring according to any one of claims 1 to 3, which is provided between the 1 st wearing part and the 2 nd wearing part, and is extended by the 2 nd wearing part being displaced to one side with respect to the 1 st wearing part.

According to the human body supporting device of claim 10, when the part of the user wearing the 2 nd wearing part moves relative to the part wearing the 1 st wearing part, the tension spring provided between the 1 st wearing part and the 2 nd wearing part is stretched. The restoring force of the tension spring is transmitted to a portion of the user where the 2 nd wearing portion is worn, thereby generating a supporting force at the portion of the user where the 2 nd wearing portion is worn. Here, in the present invention according to claim 4, the body support device is configured by using the extension spring that is reduced in weight with respect to the extension spring that generates the restoring force by the deformation of the solid such as the metal, and thereby the body support device can be reduced in weight. In the present embodiment, the gas in the gas-sealed portion constituting a part of the tension spring is compressed, and a supporting force is generated for the user. That is, in the present invention according to claim 4, it is not necessary to inject gas into the gas enclosing section in order to generate a supporting force for the user. This eliminates the need for a compressor, a tank, a pipe, and the like for injecting gas into the gas-filled portion.

The tension spring according to claim 1 has an excellent effect of achieving weight reduction of the tension spring.

The tension spring according to claim 2 has an excellent effect of being able to improve the restoring force of the tension spring.

The extension spring described in claim 3 has an excellent effect that the restoring force of the extension spring can be adjusted.

The human body supporting apparatus according to claim 6 has an excellent effect of reducing the load on the waist of the user when the user lifts a heavy object.

The human body supporting device of claim 9 has an excellent effect of being capable of achieving light weight and simplified structure.

Drawings

Fig. 1 is a perspective view of the lumbar support device as viewed from an oblique front side.

Fig. 2 is a side view of the lumbar support device as viewed from the side.

Fig. 3A is a side view showing a tension spring of a natural length, and fig. 3B is a schematic view schematically showing an elastic tube and a mesh sleeve of the tension spring in the state shown in fig. 3A.

Fig. 4A is a diagram showing a tensile spring of a natural length set on a tensile testing machine, and fig. 4B is a diagram showing the tensile spring stretched with respect to the natural length.

Fig. 5 is a side view showing a state in which a user wearing the lumbar support device leans forward.

Fig. 6 is a graph showing the relationship of the forward inclination angle of the user to the supporting torque in the lumbar support device.

Description of the reference symbols

10: lumbar support devices (human body support devices); 20B: a line clamping unit 20B (load input unit); 44: an elastic tube (gas-filled portion); 46: a mesh sleeve (cover member); 10: a lumbar support device; 16: thigh arms (1 st wearing part and leg wearing part); 18: upper body side frames (2 nd wearing part and upper body wearing part).

Detailed Description

A lumbar support device according to an embodiment of the present invention will be described with reference to fig. 1 to 4. The front side in the front-rear direction when viewed from the user who is wearing the lumbar support device and standing upright is indicated by arrow FR, the right and left sides are indicated by arrows RH and LH, respectively, and the upper side in the UP-down direction is indicated by arrow UP. In the following description, the directions of the front-back, the left-right, and the up-down are only shown, and they represent the front-back, the left-right, and the up-down when viewed from the user who is wearing the lumbar support device and standing upright.

As shown in fig. 1 and 2, a lumbar support device 10 as a human body support device includes a pair of left and right base portions 12 disposed on the lateral sides of the user's waist and a lumbar band 14 attached to the base portions 12 and worn around the user's waist. The lumbar support device 10 has thigh arms 16 as a1 st wearing portion and leg wearing portions arranged along the user's thighs and swingably attached to the base portion 12, and upper body side frames 18 as a2 nd wearing portion and upper body wearing portion arranged along the user's upper body and swingably attached to the base portion 12. Further, an extension spring 20 is attached to the upper body side frame 18.

The base portion 12 includes an outer plate 22 and an inner plate 24 formed in a plate shape. The outer panel 22 and the inner panel 24 are formed in substantially the same shape when viewed from the side (when viewed from the right or left). The outer plate 22 and the inner plate 24 are connected via a plurality of connecting pins 26 and the like. Thus, the outer panel 22 and the inner panel 24 are arranged in parallel with each other at a predetermined interval in the left-right direction.

Further, a1 st pulley 28 and a2 nd pulley 30 are rotatably provided between the outer plate 22 and the inner plate 24. The 1 st pulley 28 is attached to the lower side of the outer plate 22 and the inner plate 24 with the left-right direction as the rotation axis direction. The rotation axis of the 1 st pulley 28 is a1 st axis C1 corresponding to the hip joint of the user. The 1 st pulley 28 includes a wire clip 28A to which a part of the wire 48 described later is engaged and a thigh arm attachment portion 28B to which the thigh arm 16 described later is attached. The 2 nd pulley 30 is attached to the upper side of the outer plate 22 and the inner plate 24 and to the rear side of the 1 st pulley 28 with the left-right direction as the rotation axis direction. The axis of rotation of the 2 nd pulley 30 is the 2 nd axis C2 corresponding to the user's sacroiliac joint. Further, a guide groove 30A for guiding a longitudinally intermediate portion of a wire 48 to be described later is formed in the outer peripheral portion of the 2 nd pulley 30. The 2 nd pulley 30 has an upper body side frame attachment portion 30B extending rearward and to which an upper body side frame 18 described later is attached.

The waist belt 14 has a wide pad 14A, and the wide pad 14A is formed in a substantially C-shape with its front side opened when viewed from above the user and is disposed along the rear side and the side of the waist of the user. The waist belt 14 has a front extension portion 14B extending from each of both ends in the left-right direction of the wide pad 14A. Then, in a state where the circumferential length of the annular portion formed by the wide pad 14A and the pair of front extending portions 14B is adjusted to the length around the waist of the user, one of the front extending portions 14B is locked to the other front extending portion 14B, and the lap belt 14 is worn around the waist of the user.

The thigh arm 16 is configured to include an arm main body 32 extending along the thigh of the user and a leg pad 34 attached to the arm main body 32. The arm body 32 is formed by bending a plate-like member, and the arm body 32 includes a lateral extension 32A disposed on a lateral side of the user's thighs and a front extension 32B extending from a lower end side of the lateral extension 32A to a front side of the user's thighs. As shown in fig. 2, the side extension 32A is inclined toward the front side as it goes toward the lower side, and the upper end portion of the side extension 32A is attached to the thigh arm attachment portion 28B of the 1 st pulley 28 via the hinge 36, so that the thigh arm 16 is attached to the base portion 12 so as to be tiltable about the 1 st axis C1 as a swinging (rotating) axis. In the present embodiment, the hinge 36 is configured to be pivotable in the left-right direction, and the thigh arm 16 is also pivotable in the left-right direction with respect to the base portion 12.

The leg pad 34 is formed in a curved shape along the front surface of the thigh of the user, and the leg pad 34 is attached to the front side extension 32B of the arm body 32. The leg pad 34 is rotatable by a predetermined angle in the left-right direction as an axial direction with respect to the arm main body 32. This enables the leg pad 34 to be brought into contact with the front surface of the thigh of the user in a desired contact state.

As shown in fig. 1 and 2, the upper body side frame 18 is formed in a substantially U-shape (V-shape) having a lower side opened when viewed from the front (when viewed from the front of the user). The upper body side frame 18 includes a pair of tension spring mounting portions 38 and a connecting portion 40, the pair of tension spring mounting portions 38 being arranged at a distance in the left-right direction and having a tension spring housing portion 38A (see fig. 2) in which the tension spring 20 is arranged, and the connecting portion 40 connecting portions above the pair of tension spring mounting portions 38 in the left-right direction. The pair of tension spring attachment portions 38 are inclined to the right and left sides of the user as viewed from the front, from the upper side to the lower side. An upper body attachment band attachment portion 38B is provided on the pair of tension spring attachment portions 38, and an upper body attachment band 42 attached to the upper body of the user is attached to the upper body attachment band attachment portion 38B. The upper body wearing band 42 includes a right wearing band 42R to be worn on the right shoulder of the user and a left wearing band 42L to be worn on the left shoulder of the user, and the lengths of the right wearing band 42R and the left wearing band 42L are adjustable.

The lower end portions of the pair of tension spring mounting portions 38 are fixed to the upper body side frame mounting portion 30B of the 2 nd pulley 30. Thereby, the upper body side frame 18 can swing with respect to the base portion 12 about the 2 nd axis C2 as a swing (rotation) axis.

As shown in fig. 3A and 3B, the tension spring 20 is configured in the same manner as an artificial muscle of the so-called McKibben type. One end in the longitudinal direction of the tension spring 20 is a frame locking portion 20A locked to an upper end of the tension spring mounting portion 38 (see fig. 2) of the upper body side frame 18, and the other end in the longitudinal direction of the tension spring 20 is a wire locking portion 20B serving as a load input portion to which a wire 48 (see fig. 2) to be described later is locked. The tension spring 20 includes an elastic tube 44 as a gas-sealed portion formed in a tubular shape using an elastic material such as rubber, and a tubular mesh sleeve 46 as a cover member covering the elastic tube 44.

The elastic tube 44 has a sealed space in which gas (air) is sealed, and the elastic tube 44 is disposed between the frame locking portion 20A and the wire locking portion 20B. Air can be sealed in the elastic tube 44 via a valve 50 (see fig. 4A). This enables adjustment of the amount of gas (mass of gas) sealed in advance in the sealed space in the elastic tube 44.

The net-like sleeve 46 is formed by knitting, for example, a thread material such as a high-tension fiber having low stretchability. Both end portions of the mesh sleeve 46 in the length (axial) direction are fixed to the frame locking portion 20A and the wire locking portion 20B, respectively. Also, when the tension spring 20 is pulled from the state of the natural length shown in fig. 4A to the state shown in fig. 4B (when the wire fixing portion 20B moves in the direction of separating from the frame fixing portion 20A), the dimension of the net-like sleeve 46 in the pulling direction (the arrow a1 direction) increases and the dimension in the direction perpendicular to the pulling direction (the arrow B direction) decreases. Thereby, the dimension of the elastic tube 44 disposed in the net sleeve 46 in the pulling direction (the direction of the arrow a1) increases and the dimension in the direction perpendicular to the pulling direction (the direction of the arrow B) decreases. As a result, the volume in the sealed space in the elastic tube 44 decreases, and the gas in the sealed space is compressed. As a result, a restoring force in a direction opposite to the pulling direction (the direction of arrow a 2) is generated in the wire locking portion 20B. In the pull test shown in fig. 4A and 4B, the natural length and the length L between the frame locking portion 20A and the wire locking portion 20B in the pulled state are 228mm and 246mm, respectively. Further, the natural length and the outer diameter D of the central portion in the longitudinal direction of the elastic tube 44 in a pulled state are 36mm and 22 mm. Here, since the elastic tube 44 is closely attached to the mesh sleeve 46, it is assumed that the outer diameter of the elastic tube 44 coincides with the outer diameter of the mesh sleeve 46. In this test, the volume of the sealed space in the elastic tube 44 was reduced by about 60% by pulling the extension spring 20 from the state of the natural length shown in fig. 4A to the state shown in fig. 4B.

The lumbar support device 10 of the present embodiment has 4 or 2 tension springs 20 as described above. In the configuration having 4 tension springs 20, 2 tension springs 20 are provided in each of the pair of tension spring mounting portions 38 (see fig. 1). In the configuration having two tension springs 20, one tension spring 20 is provided in each of the pair of tension spring mounting portions 38 (see fig. 1).

As shown in fig. 2, the lower end portion (wire fixing portion 20B) of the tension spring 20 disposed in the tension spring housing portion 38A of the upper body side frame 18 is locked to one end portion of the wire 48. The wire 48 is led out from the lower end side of the upper body side frame 18, and the other end portion of the wire 48 is locked to the wire locking portion 28A of the 1 st pulley 28.

(action and Effect of the present embodiment)

Next, the operation and effect of the present embodiment will be described.

As shown in fig. 5, in the present embodiment, the lumbar support device 10 is worn on the user P by wearing the lumbar strap 14, the upper body wearing strap 42, and the thigh arms 16 on the lumbar portion P1, the upper body P2, and the thigh portions 16 of the user P, respectively.

When the user P leans forward to lift the weight 54 placed on the floor surface 52, the upper body side frame 18 swings forward with the thigh arm 16 as a fulcrum. As a result, the extension spring 20 is extended. The restoring force generated in the wire fixing portion 20B of the tension spring 20 is transmitted to the upper body P2 of the user P via the upper body side frame 18, thereby generating a supporting force in a direction of pulling up the upper body P2 of the user P who leans forward. This can reduce the load on the waist P1 of the user P when the user P lifts the weight 54 placed on the floor surface 52.

Here, a graph showing the relationship between the forward inclination angle θ of the user P and the support torque T is shown in fig. 6. The forward inclination angle θ of the user P is an angle formed by the floor surface 52 and the direction in which the upper body side frame 18 extends when the user P is viewed from the side, and the support torque T is a torque about the 2 nd axis C2 (see fig. 2) generated in the upper body side frame 18.

In the lumbar support device 10 having 4 tension springs 20, when the pressure in the elastic tube 44 of the tension spring 20 is 0.08MPa in a state where the user P stands upright (in a state where the forward inclination angle θ is 120 °), a support torque of about 100Nm is obtained when the forward inclination angle is 0 °, as shown by a characteristic line indicated by symbol T1.

In the lumbar support device 10 having two tension springs 20, when the pressure in the elastic tube 44 of the tension spring 20 is 0.2MPa in a state in which the user P stands upright (in a state in which the forward inclination angle θ is 120 °), a support torque of about 100Nm can be obtained when the forward inclination angle is 0 °, as shown by a characteristic line indicated by symbol T2. In this way, the number of the tension springs 20 and the pressure of the air enclosed in the elastic tube 44 of the tension spring 20 may be appropriately set in consideration of the weight 54 lifted by the user P, the resistance when the user P leans forward, and the like.

The characteristic line indicated by the reference character T3 is a characteristic line when the pressure in the elastic tube 44 of the tension spring 20 is maintained at 0.3MPa in the lumbar support device 10 having 4 tension springs 20 by supplying air from the outside into the elastic tube 44.

The characteristic line denoted by the reference character T4 is a characteristic line when the pressure in the elastic tube 44 is maintained at 0.5MPa in the lumbar support device 10 having 2 tension springs 20.

Further, the tension spring 20 constituting a part of the lumbar support device 10 of the present embodiment generates a restoring force in a direction opposite to the pulling direction in the wire locking portion 20B by compressing air having a mass per unit volume that is lighter than a solid such as metal. As a result, the extension spring 20 can be made lighter than an extension spring that generates a restoring force by deformation of a solid such as metal, and the lumbar support device 10 configured to include the extension spring 20 can be made lighter.

In the present embodiment, it is not necessary to inject air into the elastic tube 44 of the tension spring 20 in order to generate a restoring force in the wire fixing portion 20B, that is, in order to generate a supporting force in the upper body P2 of the user P. This eliminates the need for a compressor, a tank, a pipe, and the like for injecting gas into the elastic tube 44. As a result, the structure of the lumbar support device 10 can be simplified.

In the present embodiment, an example in which the lumbar support device 10 is configured by using the tension spring 20 of the type in which the elastic tube 44 is covered with the mesh sleeve 46 has been described, but the present invention is not limited to this. For example, the tension spring may be a type in which the wire fixing portion 20B and the frame fixing portion 20A are coupled to both ends of the elastic tube 44 in the longitudinal direction. As described above, whether or not the elastic tube 44 is provided may be appropriately set in consideration of the compression ratio of air in the elastic tube 44 when the tension spring is pulled, the pulling strength of the tension spring, and the like.

In the present embodiment, an example in which the lumbar support device 10 is configured by using the extension spring 20 has been described, but the present invention is not limited to this. For example, the present invention can be applied to a human body supporting device that supports a user's leg-up, arm-up, getting up from a lying state, and the like.

While one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and various modifications other than the above-described embodiments can be made without departing from the scope of the present invention.

Claims (11)

1. An extension spring, comprising:

a load input unit to which a load is input; and

and a gas sealing section having a sealed space in which a gas is sealed, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the gas in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section.

2. The extension spring of claim 1,

the gas enclosing section is covered with a cylindrical cover member, and when the dimension of the cylindrical cover member in the drawing direction increases, the dimension of the cylindrical cover member in a direction perpendicular to the drawing direction decreases.

3. The extension spring of claim 1,

the amount of gas sealed in the closed space in advance can be adjusted.

4. An extension spring, comprising:

a load input unit to which a load is input; and

a gas sealing section having a sealed space in which a gas is sealed, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the gas of a fixed mass sealed in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section,

when both ends of the gas enclosing section are pulled to the side away from each other, the dimension of the gas enclosing section in the direction perpendicular to the pulling direction becomes smaller as a whole, the volume decreases, and the enclosed gas of a fixed mass is compressed, thereby generating the restoring force.

5. The extension spring of claim 4,

the gas enclosing section is covered with a cylindrical cover member, and when the dimension of the cylindrical cover member in the drawing direction increases, the dimension of the cylindrical cover member in a direction perpendicular to the drawing direction decreases.

6. The extension spring of claim 4,

the amount of gas sealed in the closed space in advance can be adjusted.

7. A human body support device, comprising:

a1 st wearing part and a2 nd wearing part, which are worn by a user; and

a tension spring provided between the 1 st wearing part and the 2 nd wearing part and pulled by displacing the 2 nd wearing part to one side with respect to the 1 st wearing part,

the extension spring has:

a load input unit to which a load is input; and

and a gas sealing section having a sealed space in which a gas is sealed, wherein when the load input section is pulled, the dimension in the pulling direction is increased and the volume in the sealed space is decreased, and the gas in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input section.

8. The body support apparatus of claim 7,

the 1 st wearing part is a leg wearing part worn on the leg of the user, and the 2 nd wearing part is an upper body wearing part worn on the upper body of the user,

the user shifts the upper body wearing part relative to the leg wearing part by tilting forward.

9. A human body support device, comprising:

a pair of left and right base parts disposed on the lateral side of the waist of the user;

a waist belt attached to the base portion and worn around the waist of the user;

a leg-wearing unit that is worn on the leg of the user and is swingably attached to the base unit;

an upper body wearing unit that is worn on the upper body of the user and is attached to the base unit so as to be swingable; and

a tension spring having a load input portion to which a load is input and a gas enclosing portion having a sealed space enclosing a gas therein, wherein when the load input portion is pulled, a dimension in a pulling direction is increased and a volume in the sealed space is decreased, and the gas of a fixed mass enclosed in the sealed space is compressed, thereby generating a restoring force in a direction opposite to the pulling direction in the load input portion,

in the tension spring, when both ends of the gas enclosing section are pulled to the sides separated from each other, the entire dimension of the gas enclosing section in the direction perpendicular to the pulling direction is reduced, the volume is reduced, and the enclosed fixed mass gas is compressed, thereby generating the restoring force,

the user leans forward to displace the upper body attachment part relative to the leg attachment part, and the load input part is pulled to generate a supporting force in a direction of pulling up the upper body of the user.

10. The body support apparatus of claim 9,

the gas enclosing section is covered with a cylindrical cover member, and when the dimension of the cylindrical cover member in the drawing direction increases, the dimension of the cylindrical cover member in a direction perpendicular to the drawing direction decreases.

11. The body support apparatus of claim 9 or 10,

a valve is provided which can adjust the amount of gas sealed in the sealed space in advance.

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