Component fastening structure and installation tools

Abstract

The present disclosure provides a component fastening structure and an installation tool. The component fastening structure according to the present embodiment is a component fastening structure for fastening components by using bolts and nuts. The bolt is arranged on the peripheral surface of the shaft portion, and includes a recessed portion recessed to the central axis side and a thread groove arranged on the head side of the recessed portion. The nut includes a first nut member screwed into the thread groove, and a second nut member arranged on the outer peripheral side of the first nut member. The first nut member is provided with a lever, and the lever rotates around a rotation axis extending in a direction parallel to the axial direction of the bolt.

Description

Technical Field

[0001] The present disclosure relates to a component fastening structure and an installation tool. Background Art

[0002] Japanese Unexamined Patent Application Publication No. 2017-35220 (JP 2017-35220A) discloses a walking training device including a walking assist device attached to a trainee's leg. The walking assist device includes a thigh frame and a calf frame. The thigh frame is attached to the trainee's thigh and the calf frame is attached to the trainee's calf. Summary of the invention

[0003] In such a walking training device, various trainees wear a walking assistance device (also called a leg support or a mounting tool) for training. Therefore, an assistant is required to adjust the walking assistance device according to the trainee. For example, the assistant adjusts the frame length according to the length of the trainee's leg. In such a case, a component fastening structure for fastening two components (for example, an upper frame and a lower frame) is used. That is, the frame is formed by fastening the two components by means of the component fastening structure.

[0004] The frame length can be adjusted by an assistant loosening the bolt and nut and removing the two parts. That is, the assistant adjusts the frame length according to the leg length by changing the fastening position of the parts. Therefore, it is desired to attach and remove the parts easily and reliably. For example, it is desired to attach and remove without special tools. In addition, it is desired that the structure does not loosen during use.

[0005] The present disclosure has been made to solve such a problem, and provides a component fastening structure capable of fastening a component simply and reliably.

[0006] The component fastening structure in this embodiment is a component fastening structure that uses bolts and nuts to fasten components. The bolt includes: a shaft portion extending along a central axis; a head portion protruding outward from the shaft portion; a recessed portion provided on the peripheral surface of the shaft portion and recessed toward the central axis; and a thread groove provided on the peripheral surface of the shaft portion on the head side of the recessed portion, wherein the nut includes: a first nut member threadedly engaged with the thread groove; a second nut member arranged on the outer peripheral side of the first nut member; and a first force member arranged between the first nut member and the second nut member and exerting force on the second nut member toward the head force, wherein the first nut member is provided with a lever, the lever rotates around a rotation axis extending in a direction parallel to the axial direction of the bolt, wherein a protrusion is provided on one end side of the lever, wherein a second force applying member for applying force to the lever is provided so that the protrusion is inserted into the recessed portion, wherein the second nut member includes: a cylindrical portion, which has a hollow portion, and the first nut member is arranged in the hollow portion; an accommodating port, which accommodates the lever so that the other end side of the lever passes through the outer peripheral side of the cylindrical portion; and a knob, which protrudes toward the outer peripheral side of the cylindrical portion.

[0007] In the above-mentioned component fastening structure, a plurality of the recessed portions may be provided on the peripheral surface such that the recessed portions are spaced apart from each other in the circumferential direction.

[0008] In the above-mentioned component fastening structure, a first pin hole can be provided on the outer peripheral surface of the first nut member, and a second pin hole reaching the inner peripheral surface of the cylindrical portion from the outer side can be provided in the cylindrical portion of the second nut member, and the first nut member can be retained by the second nut member by inserting a pin into the first pin hole through the second pin hole.

[0009] In the above component fastening structure, the first pin hole may be an elongated hole whose longitudinal direction is consistent with the axial direction.

[0010] The installation tool according to this embodiment is an installation tool worn by a user, and includes: a first component, which includes a plurality of first through holes; a second component, which includes a second through hole; and the above-mentioned component fastening structure, wherein the bolt is inserted through the first through hole and the second through hole.

[0011] According to the present disclosure, it is possible to provide a component fastening structure and a mounting tool that can fasten components simply and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described hereinafter with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0013] Figure 1 A front view showing two components fastened by a component fastening structure;

[0014] Figure 2 A side view showing two components fastened by a component fastening structure;

[0015] Figure 3 A bottom view of the component fastening structure;

[0016] Figure 4 A perspective view showing the construction of a component fastening structure;

[0017] Figure 5 An exploded perspective view showing the structure of the component fastening structure;

[0018] Figure 6 A cross-sectional view of the component fastening structure cut along a plane orthogonal to the central axis;

[0019] Figure 7 A cross-sectional view of the component fastening structure cut along a plane orthogonal to the central axis;

[0020] Figure 8 A cross-sectional view for describing the operation of the component fastening structure during fastening;

[0021] Fig. 9 A cross-sectional view for describing the operation of the component fastening structure during fastening;

[0022] Fig.10 is a cross-sectional view for describing the operation of the component fastening structure when fastening; and

[0023] Fig.11 The figure is a schematic perspective view showing a mounting tool having a component fastening structure. DETAILED DESCRIPTION

[0024] Hereinafter, the present disclosure will be described by way of embodiments of the present invention. However, the present invention according to the claims is not limited to the following embodiments. Moreover, not all of the configurations described in the embodiments are necessarily indispensable as means for solving the problem.

[0025] Will refer to Figures 1 to 3A component fastening structure 1 for fastening a first component 10 and a second component 20 is described. For example, the first component 10 and the second component 20 construct a frame attached to the leg of a trainee who performs walking training. Here, the first component 10 and the second component 20 are fastened by the component fastening structure 1 to form a frame arranged along the trainee's calf. An assistant (also referred to as a user) who assists the trainee adjusts the length of the frame according to the trainee.

[0026] Figure 1 To show a front view of a component fastened by the component fastening structure 1, Figure 2 1 is a side view showing a component fastened by the component fastening structure 1 . Figure 3 It is a bottom view of the component fastening structure 1.

[0027] One of the first component 10 and the second component 20 is arranged on the upper side, and the other is arranged on the lower side. Here, the first component 10 is arranged on the knee side, and the second component 20 is arranged on the ankle side. The component fastening structure 1 is arranged on the side of the tibia. Of course, the first component 10 and the second component 20 are not limited to the calf frame and the leg support. In addition, the vertical arrangement of the first component 10 and the second component 20 is not particularly limited.

[0028] like Figure 3 As shown, the component fastening structure 1 includes a bolt 30 and a nut 60. In the component fastening structure 1, the bolt 30 and the nut 60 are used to fasten the first component 10 and the second component 20. The bolt 30 is passed through the through holes provided in the first component 10 and the second component 20. Figure 3 In the figure, a straight line along the shaft center of the bolt 30 is shown as the central axis AX. The bolt 30 and the nut 60 are attached by rotating the bolt 30 or the nut 60 around the central axis AX. By attaching the nut 60 to the bolt 30, the first component 10 and the second component 20 are fastened.

[0029] The first component 10 and the second component 20 are components extending along the lower leg in the longitudinal direction. Figure 1 In the embodiment, the first component 10 and the second component 20 are both channel steels. For example, the first component 10 and the second component 20 are both made of a metal material such as aluminum. The direction along the central axis AX is the thickness direction of the first component 10 and the second component 20.

[0030] like Figure 1 and Figure 2 As shown, the first component 10 is provided with a plurality of through holes 11. The through holes 11 penetrate in the thickness direction of the first component 10. The through holes 11 are arranged in a row along the longitudinal direction of the first component 10. Here, the through holes 11 are formed at equal intervals along the longitudinal direction of the first component 10. Each through hole 11 has the shape of an elongated hole to suppress rotation on the bolt side. The through holes 11 have the same size and the same shape.

[0031] The second component 20 includes one through hole 21. The through hole 21 penetrates the second component 20 in the thickness direction of the second component 20. The first component 10 and the second component 20 are arranged to partially overlap each other. The first component 10 and the second component 20 are arranged so that the through hole 21 of the second component 20 overlaps with one through hole 11 of the first component 10. The bolt 30 is inserted into the through hole 21 of the second component 20 and the through hole 11 of the first component 10. Subsequently, the nut 60 is attached to the bolt 30 inserted into the through hole 11 and the through hole 21. As a result, the first component 10 and the second component 20 are fixed. Here, the bolt 30 is in contact with the first component 10, and the nut 60 is in contact with the second component 20.

[0032] In addition, by changing the through hole 11 into which the bolt 30 is inserted, the length of the overlapping portion of the first component 10 and the second component 20 is changed. Therefore, the overall length of the frame can be adjusted. Figure 1 and Figure 2 The overlapped portion of the first component 10 and the second component 20 is shortened by inserting the bolt 30 into the through hole 11 on the lower side. Therefore, the frame length can be increased. Figure 1 and Figure 2 In the through hole 11 on the upper side, the overlapping portion of the first component 10 and the second component 20 becomes longer. Therefore, the frame length can be shortened. In this way, the frame length can be made variable by changing the fastening position of the component fastening structure 1.

[0033] Next, we will refer to Figures 4 to 10 A component fastening structure 1 is described. Figure 4 1 is a perspective view showing the component fastening structure 1 in a state before the bolt 30 and the nut 60 are attached. Figure 5 It is an exploded perspective view of the component fastening structure 1. Figure 6 and Figure 7 60 is a diagram for explaining the operation of the internal structure of the nut 60. Specifically, Figure 6 shows the state during tightening, while Figure 7 The state after tightening is shown. Figures 8 to 10 It is a cross-sectional view used to describe the operation of the component fastening structure. Figure 8 The operation of the component fastening structure at the beginning of fastening is shown, and Fig.10 The operation of the component fastening structure is shown when fastening is completed. Fig. 9 Show Figure 8 and Fig.10 The tightening process between.

[0034] First, refer to Figure 4 , Figure 5etc. describe the configuration of the bolt 30. The bolt 30 includes a shaft portion 31 and a head portion 32. The bolt 30 is made of a metal material such as iron.

[0035] The shaft portion 31 is a substantially cylindrical portion and is inserted into the Figure 1 The portion of the through hole 11 shown in the figure. Figure 4 and Figure 5 In the embodiment, the center of the shaft portion 31 is defined as the central axis AX. The direction parallel to the central axis AX of the shaft portion 31 is defined as the axial direction. The axial direction is the direction in which the bolt 30 is inserted into the through hole 11. Figure 4 , Figure 5 As shown in FIG. 1 , the direction around the central axis AX is defined as the circumferential direction. Therefore, like a cylindrical coordinate system, the position in the circumferential direction is represented by an angle from 0° to 360° with 0° as the reference position (original position). Figure 5 As shown, the head 32 side in the axial direction is the base end side, and the opposite side is the tip end side.

[0036] The shaft portion 31 includes a terminal surface 34 and a peripheral surface 33. The terminal surface 34 corresponds to the bottom surface of the cylinder, and the peripheral surface corresponds to the side surface of the cylinder. The terminal surface 34 is provided at the terminal side of the shaft portion 31. The terminal surface 34 is a bottom surface located at the terminal side of the cylindrical shaft portion 31. The terminal surface 34 is a plane orthogonal to the central axis AX.

[0037] The head 32 is provided on the base end side of the shaft portion 31. The head 32 is a dish-shaped portion of a disk. The outer diameter of the head 32 is larger than the outer diameter of the shaft portion 31. The outer diameter of the shaft portion 31 is smaller than the through holes 11 and 21 so as to be inserted into the through holes 11 and 21. The outer diameter of the head 32 is larger than the outer diameter of the through holes 11 and 21. Therefore, the head 32 contacts the first component 10. A washer, a coil spring, etc. may be arranged between the head 32 and the first component 10.

[0038] The peripheral surface 33 is a portion from the terminal surface 34 to the head 32. That is, the peripheral surface 33 is a side surface (outer peripheral surface) of the shaft portion 31 having a substantially cylindrical shape. A thread groove 35 and a recessed portion 36 are formed on the peripheral surface 33. The recessed portion 36 is provided on the terminal side of the thread groove 35. In the axial direction, the recessed portion 36 is arranged between the terminal surface 34 and the thread groove 35. The thread groove 35 is formed in a spiral shape on the peripheral surface 33. The thread groove 35 is provided on the head 32 side of the bolt 30 relative to the recessed portion 36.

[0039] The recessed portion 36 is a recessed portion provided on the peripheral surface 33. The recessed portion 36 is recessed toward the central axis AX side. The recessed portion 36 is larger than the pitch of the thread groove 35 and is formed deeper than the thread groove 35. As will be described later, the terminal portion 68a of the lever 68 is inserted into the recessed portion 36. The peripheral surface 33 is provided with two recessed portions 36. The recessed portions 36 are provided at two points on the peripheral surface 33. In the circumferential direction, the two recessed portions 36 are provided separately from each other. Specifically, assuming that the position of one recessed portion 36 in the circumferential direction is 0°, the position of the other recessed portion 36 in the circumferential direction is 180°. That is, the two recessed portions 36 are arranged symmetrically with respect to the central axis AX. In the axial direction, the positions of the two recessed portions 36 may be the same or different.

[0040] Next, we will refer to Figures 4 to 7 The configuration of the nut 60 is described. The nut 60 includes a first nut member 61, a second nut member 62, and a coil spring 64. In addition, the nut 60 includes a spring 63 and a lever 68. The spring 63 and the lever 68 are attached to the second nut member 62. The first nut member 61 and the lever 68 are made of a metal material such as iron. The second nut member 62 is made of a metal material such as aluminum.

[0041] The first nut member 61 is a cylindrical member or an annular member. That is, the first nut member 61 is a member having a hollow portion 61a arranged along the central axis AX. The hollow portion 61a is a columnar space along the axial direction. The shaft portion 31 is inserted into the hollow portion 61a. The first nut member 61 is screwed into the thread groove 35.

[0042] The surface of the first nut member 61 on the hollow portion 61a side is defined as an inner peripheral surface 61b. The outer peripheral surface of the first nut member 61 is referred to as an outer peripheral surface 61c. The shaft portion 31 of the bolt 30 is inserted into the hollow portion 61a. A thread groove 61s is formed on the inner peripheral surface 61b. The thread groove 61s is threadedly engaged with the thread groove 35 of the bolt 30. The thread groove 61s is provided on the entire inner peripheral surface 61b.

[0043] In a state where the thread groove 35 of the bolt 30 and the thread groove 61s of the nut 60 are engaged with each other, the user rotates the bolt 30 or the nut 60 in the circumferential direction. By doing so, the relative position of the bolt 30 with respect to the nut 60 is changed in the axial direction. For example, the user can tighten or loosen the bolt 30 and the nut 60 by rotating the nut 60 in the circumferential direction.

[0044] like Figure 5As shown in FIG. 1 and FIG. 2 , a pin hole 61h into which a pin 71 is inserted is formed on the outer peripheral surface 61c of the first nut member 61. Here, the pin hole 61h does not need to reach the inner peripheral surface 61b. That is, the pin hole 61h may be a recess provided in the outer peripheral surface 61c. The pin hole 61h may be a through hole extending from the outer peripheral surface 61c to the inner peripheral surface 61b.

[0045] like Figure 6 As shown in the figure, the pin hole 61h is arranged at two locations on the outer peripheral surface 61c. In the circumferential direction, the two pin holes 61h are arranged separately from each other. The two pin holes 61h are arranged symmetrically with respect to the central axis AX. Each pin hole 61h has an elongated hole shape with the axial direction as the longitudinal direction. As will be described later, the size of the pin hole 61h in the longitudinal direction determines the movement amount of the first nut member 61 relative to the second nut member 62.

[0046] In addition, the first nut member 61 is provided with a housing portion 61f for accommodating the lever 68 and the spring 63. The housing portion 61f is a recess provided on the outer peripheral surface 61c. The lever 68 and the spring 63 are accommodated in the housing portion 61f. In addition, the housing portion 61f reaches from the outer peripheral surface 61c to the inner peripheral surface 61b. That is, the terminal end portion 68a of the lever 68 is a protrusion protruding from the inner peripheral surface 61b toward the hollow portion 61a. The operating portion 68b of the lever 68 is arranged on the outer side of the outer peripheral surface 65c of the second nut member 62.

[0047] The lever 68 is rotatably attached to the first nut member 61 via a rotation axis 69. For example, the lever 68 is provided with a through hole through which the rotation axis 69 passes. The rotation axis 69 extends through the lever 68. The rotation axis 69 is attached to the first nut member 61. As a result, the lever 68 rotates around the rotation axis 69. The rotation axis 69 is arranged in a direction parallel to the center axis AX. In a plan view orthogonal to the center axis AX, the rotation axis 69 is located at a position deviated from the center axis AX. The opposite side of the terminal end 68a of the lever 68 is set as an operating portion 68b. The operating portion 68b is a portion protruding from the first nut member 61 in a plan view orthogonal to the center axis AX. That is, in Figure 7 In the illustrated state, the portion outside the outer peripheral surface 61c is the operating portion 68b.

[0048] The rotation shaft 69 is arranged in the accommodation portion 61f. The lever 68 is arranged along a plane orthogonal to the central axis AX. The rotation shaft 69 is arranged between the operating portion 68b and the terminal portion 68a in the longitudinal direction of the lever 68. That is, the terminal portion 68a is arranged on one end side of the lever 68, and the operating portion 68b is arranged on the other end side of the lever 68.

[0049] For example, in Figure 769, the tip portion 68a is arranged on the left side of the rotation shaft 69, and the operating portion 68b is arranged on the right side of the rotation shaft 69. When the user operates the operating portion 68b, the lever 68 rotates. As the lever 68 rotates around the rotation shaft 69, the position of the tip portion 68a changes. The rotation operation of the lever 68 will be described later.

[0050] like Figure 5 and Figure 6 As shown in FIG. 1 , the spring 63 is attached to the lever 68. The spring 63 applies force to the lever 68 so that the lever 68 rotates. For example, the accommodation portion 61f has a cylindrical recess and is as shown in FIG. Figure 7 The spring 63 is shown as being accommodated. One end of the spring 63 abuts against the lever 68, and the other end abuts against the first nut member 61. The spring 63 applies force to the operating portion 68b side of the lever 68 so that the lever 68 rotates around the rotation axis. For example, the expansion and contraction direction of the spring 63 is parallel to a plane orthogonal to the central axis AX. The spring 63 is Figure 7 In the state shown, it is much more contracted than its natural length. Figure 7 In the embodiment of the present invention, the spring 63 applies force to the lever 68 in the direction in which the lever 68 rotates clockwise.

[0051] The spring 63 is, for example, a coil spring. In this embodiment, the spring 63 has a diameter of 2 mm, a natural length of 15 mm, and a spring constant of 0.5 N / mm. Figure 7 The installation length in the state shown is 12.5 mm and the installation load is 1.25 N. Figure 6 In the state shown, it is in the most contracted state and the spring length is 10 mm. Figure 6 The maximum load in the state shown is 2.5 N. The spring 63 is a second urging member that generates an urging force for rotating the lever 68. Of course, the urging member is not limited to the spring 63, and an elastic body such as a resin may be used.

[0052] Next, the second nut member 62 will be described. The second nut member 62 is a housing for accommodating the first nut member 61. Figure 5 As shown, the second nut member 62 includes a hollow portion 62 a into which the shaft portion 31 is inserted.

[0053] The second nut member 62 includes a cylindrical portion 65 and a bottom portion 66. The cylindrical portion 65 is a cylindrical or annular portion. The inner surface of the cylindrical portion 65 is an inner peripheral surface 65b, and the outer surface is an outer peripheral surface 65c. The inner peripheral surface 65b is a surface facing the outer peripheral surface 61c of the first nut member 61. In a plan view orthogonal to the central axis AX, the diameter of the inner peripheral surface 65b is greater than the diameter of the outer peripheral surface 61c. Therefore, the first nut member 61 is accommodated in the cylindrical portion 65.

[0054] The bottom 66 is arranged on the base end side of the cylindrical portion 65, that is, arranged on the end portion on the head 32 side. The bottom 66 has a disc shape parallel to a plane orthogonal to the central axis AX. The bottom 66 has a disc shape in which the hollow portion 62a is empty. In the axial direction, the bottom 66 is arranged between the head 32 and the first nut member 61. The hollow portion 62a, the hollow portion 61a, the cylindrical portion 65 and the shaft portion 31 are coaxial in a plan view orthogonal to the central axis AX. That is, the centers of the hollow portion 62a, the hollow portion 61a and the cylindrical portion 65 coincide with the central axis AX.

[0055] The cylindrical portion 65 is open on the side opposite to the bottom 66, that is, the distal end side. Thus, the first nut member 61 is accommodated in the second nut member 62 from the distal end side of the cylindrical portion 65. The first nut member 61 is arranged in a cylindrical space 62g defined by the cylindrical portion 65 and the bottom 66.

[0056] The disc spring 64 is arranged between the bottom 66 and the first nut member 61 in the axial direction. The disc spring 64 generates an applied force in the direction in which the bottoms 66 of the first nut member 61 and the second nut member 62 are separated from each other. The disc spring 64 applies force to the second nut member 62 toward the base end side, that is, toward the head 32 side. The disc spring 64 applies force to the first nut member 61 toward the terminal side. In the axial direction, the disc spring 64 becomes a first force member that generates an applied force between the first nut member 61 and the second nut member 62. The expansion and contraction amount of the disc spring 64 is defined by the axial dimension of the pin hole 61h. That is, the spring length of the disc spring 64 has a stroke corresponding to the dimension of the pin hole 61h in the axial direction.

[0057] The cylindrical portion 65 is provided with two knobs 65e. The knob 65e is a portion of the cylindrical portion 65 that protrudes outward from the outer peripheral surface 65c. That is, the knob 65e is a portion that extends from the outer peripheral surface 65c of the cylindrical portion 65 in a direction away from the central axis AX. The two knobs 65e are arranged so as to face each other with the central axis AX interposed therebetween. The user can rotate the nut 60 in the circumferential direction by operating the two knobs 65e. By providing the second nut member 62 with the knob 65e that protrudes outward from the cylindrical portion 65, the user can easily rotate the nut 60.

[0058] In addition, the cylindrical portion 65 is provided with an accommodation port 65f for accommodating the lever 68. The accommodation port 65f is a space that reaches the inner peripheral surface 65b from the outer peripheral surface 65c. In addition, the accommodation port 65f is formed from the cylindrical portion 65 to the knob 65e. That is, a space serving as the accommodation port 65f is formed in the knob 65e and the cylindrical portion 65.

[0059] Each knob 65e is provided with a pin hole 65h. The pin hole 65h penetrates from the outer peripheral side of the knob 65e through the cylindrical portion 65 to the inner peripheral surface 65b. Figure 6As shown, in a plan view orthogonal to the central axis AX, the pin hole 65h is a through hole that penetrates the second nut member 62. In a plan view orthogonal to the central axis AX, two pin holes 65h are arranged so as to face each other with the central axis AX interposed therebetween. For example, the two pin holes 65h pass through the central axis AX and are arranged on a straight line orthogonal to the central axis AX. The pin hole 65h is formed so as to be connected to the pin hole 61h of the first nut member 61.

[0060] So, if Figure 6 and Figure 7 As shown, the pin 71 is inserted into the pin hole 65h and the pin hole 61h from the outside. The pin 71 reaches the pin hole 61h from the outside of the knob 65e via the pin hole 65h. The pin 71 protrudes from the inner peripheral surface 65b toward the central axis AX. Therefore, since the tip of the pin 71 is inserted into the pin hole 61h, the second nut member 62 and the first nut member 61 cannot be removed.

[0061] In this way, the first nut member 61 is attached to the second nut member 62. When the pin 71 is inserted into the pin hole 61h, the second nut member 62 holds the first nut member 61. It is possible to suppress the first nut member 61 from being separated from the second nut member 62. In addition, the pin hole 61h is an elongated hole whose longitudinal direction is the axial direction. Therefore, the first nut member 61 moves in the axial direction relative to the second nut member 62.

[0062] Will refer to Figure 6 and Figure 7 Describe the operation of the lever. Figure 6 and Figure 7 1 is a diagram schematically showing a cross-sectional structure of the component fastening structure 1 cut along a plane orthogonal to the axial direction. Figure 6 and Figure 7 The states in which the lever 68 is rotated at different angles about the rotation axis 69 are shown. Figure 6 shows the state during tightening, while Figure 7 The state after tightening is shown. Figure 6 The rotational positions shown are movable positions, and Figure 7 The rotational positions shown are fixed positions.

[0063] exist Figure 6 and 7 In the embodiment, the spring 63 applies force to the lever 68 in the direction in which the lever 68 rotates clockwise. That is, the spring 63 generates an urging force in the direction in which the tip 68a of the lever 68 approaches the central axis AX. In other words, the spring 63 generates an urging force in the direction in which the operating portion 68b of the lever 68 protrudes from the accommodating port 65f.

[0064] exist Figure 6In the movable position shown, the tip portion 68a of the lever 68 is not inserted into the recessed portion 36. Specifically, the axial positions of the tip portion 68a and the recessed portion 36 are offset from each other. Since the tip portion 68a is in contact with the peripheral surface 33, the tip portion 68a cannot move toward the center axis AX side. Figure 6 In the embodiment, the bolt 30 and the nut 60 are in a state where they can rotate. This state is called a movable state. In the movable state, the rotation between the bolt 30 and the nut 60 is not restricted.

[0065] When the recessed portion 36 is misaligned with the terminal portion 68a, the terminal portion 68a contacts the peripheral surface 33. The peripheral surface 33 regulates the rotation of the lever 68. Therefore, the rotation angle of the lever 68 is constant. When the user rotates the nut 60, the terminal portion 68a moves relative to the peripheral surface 33. When the nut 60 is rotated, the terminal portion 68a moves spirally on the peripheral surface 33. Therefore, the bolt 30 and the nut 60 can move relative to each other in the axial direction without the user operating the lever 68. By rotating the bolt 30 and the nut 60, the position in the axial direction is displaced. Therefore, by rotating the bolt 30 or the nut 60 in the circumferential direction, the bolt 30 can be removed from the nut 60. Alternatively, by rotating the bolt 30 or the nut 60 in the circumferential direction, the bolt 30 can be attached to the nut 60.

[0066] In such Figure 7 In the fixed position shown, the tip portion 68a of the lever 68 is inserted into the recessed portion 36. Therefore, the bolt 30 cannot rotate relative to the nut 60. This state is defined as a fixed state. In the fixed state, the rotation between the bolt 30 and the nut 60 is restricted.

[0067] Specifically, the spring 63 urges the lever 68 in a direction in which the tip 68a approaches the center axis AX. When the positions of the recess 36 and the tip 68a match, the tip 68a is inserted into the recess 36. That is, the lever 68 rotates around the rotation axis 69, and the tip 68a moves toward the center axis AX side relative to the peripheral surface 33. Figure 7 In the embodiment, the lever 68 is restricted from rotating by contacting the cylindrical portion 65 at the accommodation port 65f.

[0068] When the tip portion 68a is fitted into the recessed portion 36, the rotation operation of the nut 60 and the bolt 30 is restricted. Therefore, unless the user operates the lever 68, the bolt 30 and the nut 60 cannot be rotated. That is, unless the user rotates the lever 68 in the direction opposite to the urging force of the spring 63, the bolt 30 and the nut 60 cannot be rotated. In a state where the tip portion 68a is in the recessed portion 36 in this way, the rotation of the bolt 30 and the nut 60 is restricted. That is, the nut 60 is fixed to the bolt 30 in a fixed state.

[0069] Furthermore, in order to rotate the bolt 30 and the nut 60, the user pushes the operating portion 68b so that the lever 68 is accommodated in the accommodation portion 61f and the accommodation port 65f. Figure 6 As shown, when the lever 68 is accommodated, the tip end portion 68a is taken out of the recessed portion 36. As a result, the component fastening structure 1 is in a movable state in which the rotation restriction is released, and the bolt 30 and the nut 60 can rotate.

[0070] Will refer to Figures 8 to 10 Describe the tightening operation in detail. Figures 8 to 10 1 is a cross-sectional view showing the structure of a component fastening structure 1 for fastening a first component 10 and a second component 20 . Figures 8 to 10 It is a cross-sectional view of the component fastening structure 1 cut along a plane including the central axis AX. Figure 8 and Fig. 9 The movable state in which the tip end portion 68 a is not inserted into the recessed portion 36 is shown. Fig.10 The distal end portion 68 a is shown in a fixed state inserted into the recessed portion 36 .

[0071] Figure 8 3 is a cross-sectional view of a position where the thread groove 35 of the bolt 30 and the thread groove 61s of the nut 60 start to mesh (hereinafter referred to as a meshing start position). Fig.10 It is a cross-sectional view at a position where the fastening of the bolt 30 and the nut 60 is completed (hereinafter referred to as a fastening completion position). Fig. 9 2 is a cross-sectional view showing the structure at a position between the engagement start position and the tightening completion position. Specifically, Fig. 9 The position where the second nut member 62 contacts the second component 20 is shown.

[0072] When the shaft portion 31 of the bolt 30 is moved from a state where the bolt 30 and the nut 60 are not attached (see Figure 4 ) are inserted into the hollow portions 61a and 62a along the axial direction, the bolt 30 and the nut 60 are in Figure 8 The thread groove 35 and the thread groove 61s are in contact with each other. The tip end side of the thread groove 35 and the base end side of the thread groove 61s are in contact with each other. In this state, the tip end portion 68a is in contact with the peripheral surface 33. Figure 8 In the illustrated state, the second component 20 and the second nut member 62 are separated from each other in the axial direction.

[0073] When the shaft portion 31 of the bolt 30 is inserted into the hollow portions 61a and 62a along the axial direction, the user operates the lever 68 so as to offset the urging force of the spring 63 until the tip portion 68a contacts the peripheral surface 33. That is, the user pushes the lever 68 toward the accommodating port 65f until the thread groove 35 and the thread groove 61s are engaged with each other. By doing so, the tip portion 68a is located outside the peripheral surface 33 in a plan view orthogonal to the central axis AX. When the tip portion 68a contacts the peripheral surface 33, the tip portion 68a receives the reaction force of the urging force of the spring 63 from the peripheral surface 33. Therefore, the user can release the lever 68 after the thread groove 35 and the thread groove 61s are engaged with each other.

[0074] When the nut 60 is Figure 8 When the position shown is rotated in the tightening direction, it becomes as shown in Fig. 9 As shown. Fig. 9 In the embodiment, the nut 60 is mounted on the second component 20. That is, the bottom 66 of the second nut member 62 and the second component 20 are in contact with each other. Figure 8 and Fig. 9 The relative displacement in the axial direction caused by the rotation of the nut 60 is 1.3 mm. Fig. 9 In the state shown, the nut 60 is Figure 8 The state shown is 1.3 mm closer to the first component in the axial direction.

[0075] Until Fig. 9 In the state, since the peripheral surface 33 and the terminal portion 68a are in contact with each other, the terminal portion 68a is not in the recessed portion 36. The terminal portion 68a receives the reaction force of the urging force of the spring 63 from the peripheral surface 33. Therefore, the user can rotate the nut 60 without operating the lever 68.

[0076] Furthermore, in the axial direction, the coil spring 64 generates an urging force between the first nut member 61 and the second nut member 62. That is, the coil spring 64 urges the first nut member 61 toward the tip end side and urges the second nut member 62 toward the base end side. Figure 8 Status to Fig. 9 In the state shown, the expansion and contraction amount of the coil spring 64 is zero (natural length).

[0077] When the nut 60 is Fig. 9 When the position shown is further rotated in the tightening direction, it becomes as shown in Fig.10 As shown. Fig. 9 and Fig.10 The relative displacement in the axial direction caused by the rotation of the nut 60 is 0.7 mm.

[0078] exist Fig.10 In this state, the terminal end 68a is arranged in the recessed portion 36. Figure 7 As shown, the lever 68 protrudes from the accommodation portion 61f and the accommodation port 65f. As described above, the rotation of the bolt 30 and the nut 60 is restricted. In other words, the fastening of the bolt 30 and the nut 60 is maintained unless the user pushes in the lever 68. It is possible to suppress the bolt 30 from being disengaged from the nut 60. Therefore, the first component 10 and the second component 20 can be firmly fastened.

[0079] When removing the first component 10 and the second component 20, the user Figure 7 and Fig.10 The lever 68 is operated in the state shown. That is, the user pushes the lever 68 toward the accommodating portion 61f. As a result, the lever 68 moves along Figure 6 60. The lever 68 is pushed in and the user rotates the nut 60 in the loosening direction. By doing so, the nut 60 is removed from the bolt 30, so that the first component 10 and the second component 20 can be removed.

[0080] As described above, in the present embodiment, the nut 60 includes the first nut member 61, the second nut member 62, the spring 63, and the lever 68. When the user pushes the spring 63, the lever 68 rotates, so that the bolt 30 and the nut 60 can be attached and detached. The user can easily and firmly fasten the first component 10 and the second component 20.

[0081] In addition, the user can remove the bolt 30 and the nut 60 only by lever operation and rotating the nut 60. Therefore, simple attachment and removal are possible. No special tools for installation and removal are required. That is, attachment and removal can be performed by the user's own hands or fingers. In addition, durability and workability can be improved.

[0082] In other words, unless the user pushes in the lever 68, the bolt 30 will not come off the nut 60. As a result, the bolt 30 and the nut 60 can be firmly fixed. Loosening of the bolt 30 can be suppressed, and the two components can be firmly fastened. That is, when the components are fastened, the bolt 30 can be suppressed from coming off the nut 60.

[0083] In addition, when the nut 60 is Fig. 9 When the position shown is further rotated in the direction of further tightening, the disc spring 64 contracts. In the axial direction, the size of the pin hole 61h in the longitudinal direction ensures the displacement (stroke) of the pin 71 in the pin hole 61h. That is, within the size of the pin hole 61h, the distance between the bottom 66 and the first nut member 61 in the axial direction changes. In addition, the distance between the first nut member 61 and the second nut member 62 in the axial direction changes according to the expansion and contraction amount of the disc spring 64.

[0084] In addition, as the coil spring 64 contracts, the applied force between the first nut member 61 and the second nut member 62 becomes stronger. Therefore, after the nut 60 contacts the second component 20, the coil spring 64 contracts when the nut 60 is rotated in the tightening direction. The more the nut 60 is rotated in the tightening direction, the stronger the force required to rotate the nut 60.

[0085] Therefore, in the present embodiment, two recessed portions 36 are arranged separately from each other in the circumferential direction on the peripheral surface 33. This makes it possible to suppress the increase in the force for rotating the nut 60. In the present embodiment, the two recessed portions 36 are arranged 180° apart in the circumferential direction. It is possible to make the rotation angle of the nut 60 from the height at which the terminal portion 68a is assembled in the recessed portion 36 to the rotation angle of the nut 60 until the axial position of the recessed portion 36 matches the terminal portion 68a less than 180°. On the other hand, when only one recessed portion 36 is provided on the peripheral surface 33, the rotation angle of the nut 60 until the recessed portion 36 matches the axial position of the terminal portion 68a is 360° at maximum. Therefore, by forming two or more recessed portions 36 separately in the circumferential direction, it is possible to suppress the increase in the force for rotating the nut 60.

[0086] Will refer to Figure 5 The method of attaching the first nut member 61 to the second nut member 62 is described. First, the user attaches the lever 68 to the accommodating portion 61f in a state where the spring 63 is accommodated in the accommodating portion 61f. Subsequently, the user attaches the lever 68 to the first nut member 61 by using the rotating shaft 69. As a result, the nut member 61 can be prepared as follows. Figure 5 A first nut member 61 is shown.

[0087] Next, the user attaches the first nut member 61 having the lever 68 to the second nut member 62. Specifically, in a state where the first nut member 61 is tilted relative to the axial direction, the operating portion 68b is passed through the accommodating opening 65f from the inner peripheral surface 65b side. The user passes the operating portion 68b of the lever 68 from the inner peripheral surface 65b side to the outer peripheral surface 65c side. The user matches the circumferential directions of the pin hole 61h and the pin hole 65h. Subsequently, the pin 71 is press-fitted into the pin hole 65h so as to be stuck in the pin hole 61h. As a result, since the first nut member 61 is attached to the second nut member 62, a Figure 4 Nut 60 is shown.

[0088] In addition, by making the pin hole 61h into a through hole, the first nut member 61 can be removed from the second nut member 62. Specifically, by pushing the pin 71 toward the central axis AX, the pin 71 protrudes from the inner peripheral surface 61b. Therefore, the pin 71 can be removed from the hollow portion 61a. By removing the two pins 71, the first nut member 61 can be taken out from the second nut member 62.

[0089] Fig.11 1 is a diagram showing an example of a mounting tool using the component fastening structure 1 . Fig.11 1 is a perspective view schematically showing a mounting tool 120 worn by a user. The mounting tool 120 mainly includes a control unit 121, a plurality of frames supporting various parts of the affected leg, and a load sensor 222 for detecting a load applied to the sole of the foot. The mounting tool 120 is used as a walking assist device having a drive unit and a control unit.

[0090] The control unit 121 includes an auxiliary control unit 220 that controls the installation tool 120, and also includes a motor (not shown) that generates a driving force for assisting the extension and flexion movements of the knee joint. The frame that supports each part of the affected leg includes a thigh frame 122 and a calf frame 123 that can be rotatably connected to the thigh frame 122. In addition, the frame includes a foot flat frame 124 that can be rotatably connected to the calf frame 123, a front connecting frame 127, and a rear connecting frame 128.

[0091] The thigh frame 122 and the calf frame 123 are connected around the hinge axis H shown in the figure. a The motor of the control unit 121 rotates according to the instruction of the auxiliary control unit 220 to assist the thigh frame 122 and the calf frame 123 to rotate around the hinge axis H. a For example, the angle sensor 223 contained in the control unit 121 is a rotary encoder, and detects the angle of the thigh frame 122 and the calf frame 123 around the hinge axis H. a The calf frame 123 and the foot flat frame 124 are arranged around the hinge axis H shown in the figure. b The relative rotation angle range is pre-adjusted by the adjustment mechanism 126.

[0092] The thigh frame 122 includes a thigh belt 129. The thigh belt 129 is a belt integrally provided on the thigh frame, and is wrapped around the thigh of the affected leg to fix the thigh frame 122 to the thigh. This suppresses displacement of the entire mounting tool 120 relative to the trainee's leg.

[0093] The load sensor 222 is a load sensor embedded in the foot-level frame 124. The load sensor 222 can also be configured to detect the size and distribution of the vertical load received by the sole of the trainee, for example, to detect the center of pressure (COP). For example, the load sensor 222 is a resistance change detection type load detection sheet in which electrodes are arranged in a matrix.

[0094] The calf frame 123 includes Figure 1The first component 10 and the second component 20 shown. Then, the first component 10 and the second component 20 are connected via the component fastening structure 1. That is, the user attaches the first component 10 and the second component 20 through the component fastening structure 1. Therefore, the length of the calf frame 123 can be adjusted according to the leg length of the user wearing the installation tool 120. The user can easily and firmly fasten the first component 10 and the second component 20 of the calf frame 123. Therefore, the frame length can be easily adjusted. The number of components fastened by the component fastening structure 1 can be three or more.

[0095] Although the invention made by the present inventors has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments and various modifications can be made within the scope not departing from the gist thereof.

Claims

1. A component fastening structure, which uses bolts and nuts to fasten components. The bolts include: a shaft portion extending along a central axis; a head portion protruding outward from the shaft portion; a recessed portion provided on a peripheral surface of the shaft portion and recessed toward the central axis side; as well as a thread groove provided on the peripheral surface of the shaft portion on the head side of the recessed portion, The nut comprises: a first nut member threadably engaged with the thread groove; a second nut member disposed on an outer peripheral side of the first nut member; and a first force applying member disposed between the first nut member and the second nut member and applying force to the second nut member toward the head, wherein the first nut member is provided with a lever, the lever rotating about a rotation axis extending in a direction parallel to the axial direction of the bolt, A protrusion is provided at one end of the lever. A second force applying member is provided to apply force to the lever so that the protrusion is inserted into the recessed portion. The second nut member comprises: a cylindrical portion having a hollow portion, wherein the first nut member is disposed in the hollow portion; an accommodation port that accommodates the lever so that the other end side of the lever passes through to the outer peripheral side of the cylindrical portion; and A knob protrudes toward the outer peripheral side of the cylindrical portion. 2 . The component fastening structure according to claim 1 , wherein a plurality of the recessed portions are provided on the peripheral surface such that the recessed portions are spaced apart from each other in a circumferential direction.

3. The component fastening structure according to claim 1 or 2, A first pin hole is provided on the outer peripheral surface of the first nut member, wherein a second pin hole is provided in the cylindrical portion of the second nut member, reaching from the outer side to the inner peripheral surface of the cylindrical portion, and The first nut member is held by the second nut member by a pin inserted into the first pin hole via the second pin hole. 4 . The component fastening structure according to claim 3 , wherein the first pin hole is an elongated hole whose longitudinal direction coincides with the axial direction.

5. A mounting tool, which is worn by a user, comprising: A first component including a plurality of first through holes; a second component including a second through hole; as well as The component fastening structure according to any one of claims 1 to 4, The bolt is inserted through the first through hole and the second through hole.

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