Component fastening structures and installation tools

Abstract

The present disclosure relates to a component fastening structure and an installation tool. The component fastening structure uses a bolt and a nut to fasten components. The bolt includes: a first spiral groove; a second spiral groove, which is arranged on the end side of the bolt relative to the first spiral groove; a slit, which extends from the end of the bolt through the second spiral groove to the first spiral groove; and a slack suppression groove, which extends from the other end of the second spiral groove to the end side. The nut includes: a first nut member, which includes a first pin protruding toward the center axis side and inserted into the first spiral groove; a second nut member, which includes a second pin protruding toward the center axis side and inserted into the second spiral groove; and a force member, which is arranged between the first nut member and the second nut member, and applies force to the first nut member toward the head 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 (JP2017-35220A) 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 this walking training device, different trainees wear walking assistance devices (also called leg braces or mounting tools) for training. Therefore, an assistant needs to adjust the walking assistance device according to the trainees. For example, the assistant adjusts the frame length according to the length of the trainee's legs. In this case, a component fastening structure for fastening two components (e.g., an upper frame and a lower frame) is used. That is, a frame is formed by fastening two components with the component fastening structure.

[0004] The frame length can be adjusted by an assistant loosening the bolt and nut and removing the two components. That is, the assistant adjusts the frame length according to the leg length by changing the fastening position of the components. Therefore, it is desired to attach and remove the components 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 aims to solve such a problem and provides a component fastening structure capable of fastening components simply and reliably.

[0006] The component fastening structure in this embodiment is a component fastening structure that uses a bolt and a nut to fasten a component. The bolt includes: a first spiral groove, which is arranged on the circumferential surface of the bolt; a second spiral groove, which is arranged on the circumferential surface of the bolt and is arranged on the end side of the bolt relative to the first spiral groove; a slit, which is arranged on the circumferential surface of the bolt along the axial direction and extends from the end of the bolt through the second spiral groove to the first spiral groove; and a slack suppression groove, which extends from the other end of the second spiral groove to the end side, and the nut includes: a first nut member, which includes a first pin protruding from the inner circumferential surface toward the central axis side and inserted into the first spiral groove; and a second nut member, which includes a second pin protruding from the inner circumferential surface toward the central axis side and inserted into the second spiral groove; and a force member, which is arranged between the first nut member and the second nut member, and applies force to the first nut member toward the head of the bolt.

[0007] In the above-mentioned component fastening structure, the first spiral groove may be configured to be thicker than the second spiral groove, the first pin may be thicker than the second pin, and the first pin may be thicker than the second spiral groove.

[0008] In the above-mentioned component fastening structure, the first nut member may include: a cylindrical portion; and a disc-shaped portion, which protrudes from the cylindrical portion to the outer peripheral side, the second nut member can be arranged on the outer peripheral side of the cylindrical portion, the cylindrical portion can be provided with a through hole extending through the cylindrical portion in a direction orthogonal to the axial direction, the through hole can be an elongated hole, whose longitudinal direction is consistent with the axial direction, and the second pin can extend through the through hole.

[0009] In the above-mentioned component fastening structure, the urging member may be arranged between the disk portion and the second nut member.

[0010] In the above-mentioned component fastening structure, the first nut member can be provided with a plurality of first pins spaced apart from each other in the circumferential direction, the second nut member can be provided with a plurality of second pins spaced apart from each other in the circumferential direction, a plurality of the first spiral grooves can be provided corresponding to the first pins, a plurality of the second spiral grooves can be provided corresponding to the second pins, and a circumferential angle of the first spiral grooves and the second spiral grooves can be less than 180°.

[0011] In the above component fastening structure, the nut may be provided with two first pins and two second pins, the two second pins may be arranged to face each other with a central axis therebetween, and the two first pins may be arranged to face each other with the central axis therebetween.

[0012] The mounting tool according to the present embodiment is a leg support worn by a user, and comprises: a first component including a plurality of first through holes; a second component including 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.

[0013] According to the present disclosure, a component fastening structure and a mounting tool capable of simply and reliably fastening a component can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0015] Figure 1 is a perspective view showing two components fastened by a component fastening structure;

[0016] Figure 2is a perspective view showing two components fastened by a component fastening structure;

[0017] Figure 3 is a side view of a fastening portion of a component fastening structure;

[0018] Figure 4 is a three-dimensional view of a fastening portion of a component fastening structure;

[0019] Figure 5 is a perspective view showing the arrangement of bolts;

[0020] Figure 6 It is an exploded stereogram of the nut;

[0021] Figure 7 is a perspective view showing a state before the bolt and nut are attached;

[0022] Figure 8 is a perspective view showing an attached state of a bolt and a nut;

[0023] Fig. 9 is a cross-sectional view showing a cut component fastening structure; and

[0024] Fig.10 is a schematic perspective view showing a mounting tool having a component fastening structure. DETAILED DESCRIPTION

[0025] Hereinafter, the present disclosure will be described by embodiments of the present invention. However, the claims of the present invention are not limited to the following embodiments. In addition, all configurations described in the embodiments are not essential to the means for solving the problem.

[0026] Will refer to Figures 1 to 4 A 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 are configured as a frame to be 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.

[0027] Figure 1 It is a perspective view showing a state before fastening. Figure 2 It is a perspective view showing a state after fastening. Figure 3 is a side view showing a state after fastening. Figure 4 is a diagram showing a cut component fastening structure.

[0028] 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 transversely relative to the shin. 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.

[0029] 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 passes through the through holes provided in the first component 10 and the second component 20. Figure 1 In the figure, a straight line along the axis center of the bolt 30 is shown as the center axis AX. The bolt 30 and the nut 60 are attached by rotating the bolt 30 or the nut 60 around the center axis AX. By attaching the nut 60 to the bolt 30, the first component 10 and the second component 20 are fastened.

[0030] The first component 10 and the second component 20 are members whose longitudinal directions are along the lower leg. 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.

[0031] 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 extend 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 an elongated hole shape to suppress the rotation of the bolt side. The through holes 11 have the same size and the same shape.

[0032] The second component 20 includes one through hole 21. The through hole 21 extends through 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. Then, the nut 60 is attached to the bolt 30 inserted into the through hole 11 and the through hole 21. Therefore, 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.

[0033] Furthermore, by changing the through holes 11 into which the bolts 30 are inserted, the length of the overlapping portion of the first component 10 and the second component 20 is changed. Thus, the overall length of the frame can be adjusted. For example, by inserting the bolts 30 into the through holes 11, the length of the overlapping portion of the first component 10 and the second component 20 can be changed. Figure 1 The through holes 11 on the left side shorten the overlapped portion of the first component 10 and the second component 20. As a result, the frame length can be increased. By inserting the bolts 30 into the through holes 11, the overlapped portion of the first component 10 and the second component 20 can be shortened. Figure 1 In the through hole 11 on the right side, the overlapping portion of the first component 10 and the second component 20 is longer. Thus, the frame length can be shortened. In this way, by changing the fastening position of the component fastening structure 1, the frame length can be changed.

[0034] Next, we will refer to Figures 5 to 9 A component fastening structure 1 is described. Figure 5 It is a perspective view showing the structure of the bolt 30 . Figure 6 It is an exploded perspective view of the nut 60 . Figure 7 is a perspective view showing the component fastening structure 1 in a state before the bolt 30 and the nut 60 are attached. Figure 8 is a perspective view showing the component fastening structure 1 in a state where the bolt 30 and the nut 60 are attached. Fig. 9 : is a cross-sectional view showing the component fastening structure 1 in a state where the bolt 30 and the nut 60 are attached.

[0035] First, refer to Figure 5 The configuration of the bolt 30 is described in detail in FIG. The bolt 30 includes a shaft portion 31 and a head portion 32. The shaft portion 31 is a substantially cylindrical portion that is inserted into the bolt 30. Figure 1 The portion of the through hole 11 shown in the figure. 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 5 As shown in FIG. 1 , the direction around the central axis AX is defined as the circumferential direction. Therefore, similar to the cylindrical coordinate system, the position in the circumferential direction is represented by an angle of 0 to 360°, and the reference position (origin position) is 0°. 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 the 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 portion 32 is provided on the base end side of the shaft portion 31. The head portion 32 is a disk-shaped disc portion. The outer diameter of the head portion 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, 21 so as to be inserted into the through holes 11, 21. The outer diameter of the head portion 32 is larger than the outer diameter of the through holes 11, 21. Therefore, the head portion 32 contacts the first component 10. A washer, a disc spring, etc. may be arranged between the head portion 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 first spiral groove 41, a second spiral groove 42, a slit 43, and a slack suppression groove 44 are formed on the peripheral surface 33. The second spiral groove 42 is provided on the terminal side of the first spiral groove 41. In the axial direction, the second spiral groove 42 is arranged between the terminal surface 34 and the first spiral groove 41. That is, the first spiral groove 41 is arranged on the head 32 side, and the second spiral groove 42 is arranged on the terminal surface 34 side.

[0039] The first spiral groove 41 and the second spiral groove 42 are grooves (recesses) formed in a spiral shape on the circumferential surface 33. The distance between the first spiral groove 41 and the end surface 34 varies according to the position (angle) in the circumferential direction. One end of the first spiral groove 41 is arranged on the end surface 34 side, and the other end is arranged on the head 32 side. Similarly, the distance between the second spiral groove 42 and the end surface 34 varies according to the position in the circumferential direction. One end of the second spiral groove 42 is arranged on the end surface side, and the other end is arranged on the head 32 side. The first spiral groove 41 and the second spiral groove 42 are formed parallel to each other. That is, the distance between the first spiral groove 41 and the second spiral groove 42 in the axial direction is constant. For example, when rotated 90° in the circumferential direction, the position of the first spiral groove 41 is offset by 1 mm in the axial direction.

[0040] Further, the peripheral surface 33 of the bolt 30 is provided with a slit 43 formed along the axial direction. The slit 43 is a groove parallel to the center axis AX direction. The slit 43 extends from the end surface 34 to the first spiral groove 41. The slit 43 is connected to one end of the first spiral groove 41 on the end surface 34 side. The slit 43 is connected to one end of the second spiral groove 42 on the end surface 34 side. That is, the slit 43 reaches one end of the first spiral groove 41 from the end surface 34 via one end of the second spiral groove 42.

[0041] The slack suppressing groove 44 is connected to the second spiral groove 42. The slack suppressing groove 44 is a groove formed in the axial direction on the peripheral surface 33. The slack suppressing groove 44 is formed from the other end of the second spiral groove 42 on the head 32 side toward the terminal surface 34 side. The slack suppressing groove 44 does not reach the terminal surface 34. That is, the length of the slack suppressing groove 44 in the axial direction is shorter than the distance from the terminal surface 34 to the other end of the second spiral groove 42. The slit 43 is connected to one end of the second spiral groove 42, and is formed with the slack suppressing groove 44 at the other end.

[0042] In addition, in the present embodiment, two slits 43 are formed on the peripheral surface 33. The two slits 43 are arranged to face each other with the central axis AX placed therebetween. Likewise, two slack suppressing grooves 44 are formed on the peripheral surface 33. The two slack suppressing grooves 44 are arranged to face each other with the central axis AX placed therebetween.

[0043] Assume that the position of one slit 43 in the circumferential direction is 0°, and the position of the other slit 43 in the circumferential direction is 180°. That is, the two slits 43 are arranged symmetrically with respect to the central axis AX. Assume that the position of one slack suppression groove 44 in the circumferential direction is θ1, and the position of the other slack suppression groove 44 in the circumferential direction is (θ1+180°). Note that θ1 is less than 180°. That is, the two slack suppression grooves 44 are arranged symmetrically with respect to the central axis AX.

[0044] Similarly, two first spiral grooves 41 and two second spiral grooves 42 are formed on the peripheral surface 33. In the circumferential direction, one first spiral groove 41 is formed so as not to overlap with another first spiral groove 41. That is, the circumferential dimension (angular range) of each first spiral groove 41 is formed to be less than 180°.

[0045] Specifically, in the circumferential direction, one first spiral groove 41 is formed in the range of 0° to θ1, and the other first spiral groove 41 is formed in the range of 180° and above (θ1+180°). The two first spiral grooves 41 are arranged symmetrically with respect to the central axis AX. The circumferential angle of each first spiral groove 41 is less than 180°.

[0046] Similarly, in the circumferential direction, one second spiral groove 42 is formed so as not to overlap with another second spiral groove 42. That is, the circumferential dimension (angular range) of each second spiral groove 42 is formed to be smaller than 180°.

[0047] Specifically, in the circumferential direction, one second spiral groove 42 is formed in the range of 0° to θ1, and the other second spiral groove 42 is formed in the range of 180° and above (θ1+180°). The two second spiral grooves 42 are symmetrically arranged relative to the central axis AX. The circumferential angle of each second spiral groove 42 is less than 180°. Here, the first spiral groove 41 and the second spiral groove 42 have substantially the same length in the circumferential direction.

[0048] As described above, the circumferential angle of the first spiral groove 41 and the second spiral groove 42 is less than 180°. Thus, two first spiral grooves 41 and two second spiral grooves 42 can be formed on the circumferential surface 33. The circumferential surface 33 can be flat at the position where the slit 43 is formed in the circumferential direction. The bolt 30 is made of a metal material such as iron or stainless steel. The diameter of the shaft portion 31 is about 7mm to 8mm.

[0049] Next, we will refer to Figure 6 , Figure 7 etc. describe the structure of the nut 60. The nut 60 includes a first nut member 61, a second nut member 62 and a spring 63. The second nut member 62 is a cylindrical member or an annular member. That is, the second nut member 62 is a member having a hollow portion 62a arranged along the central axis AX. The hollow portion 62a is a cylindrical space along the axial direction. The surface of the second nut member 62 on the side of the hollow portion 62a is defined as an inner peripheral surface 62b. The outer peripheral surface of the second nut member 62 is referred to as an outer peripheral surface 62c.

[0050] The second nut member 62 has a second pin 72. For example, the second nut member 62 is formed with a pin hole 62h for fixing the second pin 72. The pin hole 62h is a through hole extending from the outer peripheral surface 62c to the inner peripheral surface 62b.

[0051] The second pin 72 is pressed into the pin hole 62h from the outer peripheral surface 62c side. The second pin 72 protrudes from the inner peripheral surface 62b of the second nut member 62 toward the central axis AX side. The second pin 72 is arranged along a direction that passes through the central axis AX and extends in a direction orthogonal to the central axis AX. When the second pin 72 is inserted into the pin hole 62h, the second nut member 62 holds the second pin 72.

[0052] like Fig. 9As shown, the second pin 72 is inserted into the second spiral groove 42 of the bolt 30. Here, the second nut member 62 is provided with two second pins 72 and two pin holes 62h. A plurality of second pins 72 are arranged separately from each other in the circumferential direction. The two second pins 72 are arranged symmetrically about the central axis AX. That is, the two second pins 72 are arranged on the same straight line orthogonal to the central axis AX. The two second pins 72 correspond to the two second spiral grooves 42. That is, when fastening the components, one second pin 72 is inserted into one second spiral groove 42, and the other second pin 72 is inserted into the other second spiral groove 42.

[0053] like Figure 6 As shown in the figures, the first nut member 61 includes a cylindrical portion 65 and a disc-shaped portion 66. The cylindrical portion 65 is a cylindrical member having a hollow portion 65a. The hollow portion 65a is a cylindrical space along the axial direction. The outer diameter of the cylindrical portion 65 is smaller than the diameter of the hollow portion 62a of the second nut member 62. The cylindrical portion 65 is inserted into the hollow portion 62a of the second nut member 62. The surface of the cylindrical portion 65 on the hollow portion 65a side is defined as an inner peripheral surface 65b. The outer peripheral surface of the cylindrical portion 65 is defined as an outer peripheral surface 65c. The outer peripheral surface 65c is a surface opposite to the inner peripheral surface 62b of the second nut member 62.

[0054] The disc-shaped portion 66 is formed at one end of the cylindrical portion 65. The disc-shaped portion 66 is a flange-shaped (eave-shaped) portion extending outward from the outer peripheral surface 65c of the cylindrical portion 65. That is, the outer diameter of the disc-shaped portion 66 is larger than the outer diameter of the cylindrical portion 65. The outer diameter of the disc-shaped portion 66 is substantially the same as the outer diameter of the second nut member 62. The disc-shaped portion 66 is formed at the end of the first nut member 61 on the head 32 side (see Figure 8 ).

[0055] In a plan view orthogonal to the central axis AX, the centers of the cylindrical portion 65, the disk-shaped portion 66, the hollow portion 62a, and the hollow portion 65a coincide with the central axis AX. The cylindrical portion 65, the disk-shaped portion 66, the hollow portion 62a, and the hollow portion 65a are circular in a plan view orthogonal to the central axis AX. The cylindrical portion 65, the disk-shaped portion 66, the hollow portion 62a, and the hollow portion 65a are concentric circles in a top view orthogonal to the central axis AX.

[0056] like Figure 8 As shown, in the axial direction, the disk-shaped portion 66 is arranged between the second nut member 62 and the head 32. One surface of the disk-shaped portion 66 faces the head 32, and the other surface faces the second nut member 62. Then, as shown in FIG. Figure 8 and Fig. 9 As shown, a space S in which the first component 10 and the second component 20 are arranged is formed between the disk portion 66 and the head portion 32 .

[0057] like Figure 6As shown, the first nut member 61 includes a first pin 71. For example, the cylindrical portion 65 is formed with a pin hole 65h for fixing the first pin 71. The pin hole 65h is a through hole extending from the outer peripheral surface 65c of the cylindrical portion 65 to the inner peripheral surface 65b.

[0058] The first pin 71 is pressed into the pin hole 65h from the outer peripheral surface 65c. The first pin 71 protrudes from the inner peripheral surface 65b toward the center axis AX. The first pin 71 is arranged in a direction passing through the center axis AX and extending in a direction orthogonal to the center axis AX. When the first pin 71 is inserted into the pin hole 65h, the first nut member 61 holds the first pin 71.

[0059] like Fig. 9 As shown, the first pin 71 is inserted into the first spiral groove 41. Here, the first nut member 61 is provided with two first pins 71 and two pin holes 65h. A plurality of first pins 71 are provided separately from each other in the circumferential direction. The two first pins 71 are symmetrically arranged about the central axis AX. That is, the two first pins 71 are arranged on the same straight line orthogonal to the central axis AX. The two first pins 71 correspond to the two first spiral grooves 41. That is, one first pin 71 is inserted into one first spiral groove 41, and the other first pin 71 is inserted into the other first spiral groove 41.

[0060] In the axial direction, the first pin 71 is arranged between the disk portion 66 and the second pin 72. In the circumferential direction, the positions of the first pin 71 and the second pin 72 overlap each other. The distance between the two first pins 71 in the circumferential direction is 180°. The distance between the two second pins 72 in the circumferential direction is 180°.

[0061] like Figure 6 and Fig. 9 As shown, the cylindrical portion 65 is formed with an elongated hole 65d for inserting the second pin 72. The elongated hole 65d is a through hole that reaches the inner peripheral surface 65b from the outer peripheral surface 65c of the cylindrical portion 65. The elongated hole 65d extends through the cylindrical portion 65 in a direction orthogonal to the central axis AX. The cross-sectional shape of the elongated hole 65d is an elongated hole shape with the axial direction as the longitudinal direction.

[0062] Two elongated holes 65d are formed in the cylindrical portion 65. The two elongated holes 65d correspond to the two second pins 72. That is, one second pin 72 is inserted into one elongated hole 65d, and the other second pin 72 is inserted into the other elongated hole 65d. The size of the elongated hole 65d is larger than the diameter of the second pin 72. Thus, the second pin 72 is displaced along the longitudinal direction of the elongated hole 65d. That is, the second pin 72 moves in the axial direction in the elongated hole 65d. In the axial direction, the size of the longitudinal direction of the elongated hole 65d defines the displacement amount (stroke) of the second pin 72 relative to the first pin 71. That is, the axial distance between the first pin 71 and the second pin 72 varies according to the size of the elongated hole 65d.

[0063] The spring 63 is provided between the second nut member 62 and the first nut member 61. For example, the second nut member 62 is provided with a recess or the like for arranging the spring 63. The spring 63 is, for example, a coil spring and is arranged in the axial direction. The spring 63 expands and contracts in the axial direction.

[0064] The spring 63 is arranged between the second nut member 62 and the disc portion 66. One end of the spring 63 is in contact with the second nut member 62, and the other end is in contact with the disc portion 66. The spring 63 is arranged along Figure 8 The disc portion 66 is pushed in the pushing direction indicated by the arrow B. That is, the spring 63 generates a pushing force in the axial direction to separate the disc portion 66 from the second nut member 62 .

[0065] Therefore, if Figure 8 As shown, the spring 63 creates a gap G between the disk portion 66 and the second nut member 62. In this way, the spring 63 is arranged between the second nut member 62 and the first nut member 61. The spring 63 is a biasing member that biases the first nut member 61 toward the head 32 of the bolt 30. In other words, the spring 63 pushes the second nut member 62 in a direction away from the head 32. Of course, the biasing member is not limited to the spring 63, and an elastic body such as a resin can be used.

[0066] The spring 63 has, for example, an outer diameter of 3 mm and a natural length of 10 mm. The spring constant k=0.3 N / mm. The spring length when installed is 7 mm, and the installation load is 0.9 N. The maximum expansion / contraction amount of the spring 63 is 5 mm, and the maximum load is 1.5 N. Since the spring 63 expands and contracts within the range of 5 mm to 7 mm, the dimension of the longitudinal direction of the elongated hole 65 d is 2 mm.

[0067] A method of attaching the second nut member 62 and the first nut member 61 will be described. First, prepare the first nut member 61 to which the first pin 71 is attached. Specifically, the first pin 71 is inserted into the pin hole 65h from the outer peripheral surface 65c side. The first pin 71 is fixed to the first nut member 61 by pressing the first pin 71 into the pin hole 65h. The first pin 71 protrudes from the inner peripheral surface 65b toward the central axis AX. In addition, prepare the second nut member 62 to which the second pin 72 is not attached.

[0068] The spring 63 is arranged between the first nut member 61 and the second nut member 62. Then, the cylindrical portion 65 is inserted into the hollow portion 62a of the second nut member 62. Here, the relative position of the first nut member 61 and the second nut member 62 is adjusted so that the positions of the circumferential direction of the elongated hole 65d and the pin hole 62h match. As a result, the elongated hole 65d is connected to the pin hole 62h. The second pin 72 is inserted into the pin hole 65h and the elongated hole 65d from the outer peripheral surface 62c side. By pressing the second pin 72 into the pin hole 65h, the second pin 72 is fixed to the second nut member 62.

[0069] Therefore, if Figures 7 to 9 As shown in , etc., the second nut member 62 and the first nut member 61 are fixed. Since the second pin 72 protrudes from the inner peripheral surface 65b of the cylindrical portion 65 toward the central axis AX, the second nut member 62 and the first nut member 61 become immovable.

[0070] As described above, the cylindrical portion 65 is provided with an elongated hole 65d extending in the axial direction. The second pin 72 can move in the axial direction in the elongated hole 65d. The extension and contraction of the spring 63 changes the distance between the first pin 71 and the second pin 72 in the axial direction. In other words, the elongated hole 65d defines the extension and contraction length of the spring 63. The distance between the first pin 71 and the second pin 72 changes by a distance corresponding to the length of the elongated hole 65d in the axial direction.

[0071] Here, two springs 63 are arranged between the second nut member 62 and the first nut member 61. In the circumferential direction, the two springs 63 are arranged symmetrically about the central axis AX. Specifically, the first pin 71, the spring 63, the first pin 71 and the spring 63 are arranged at intervals of 90° in the circumferential direction. In addition, in the circumferential direction, the positions of the first pin 71 and the second pin 72 overlap each other.

[0072] Next, we will refer to Figures 7 to 9etc. describe a method of attaching the bolt 30 and the nut 60. The nut 60 is inserted into the shaft portion 31 of the bolt 30. That is, the shaft portion 31 is inserted into the hollow portion 65a. Here, the positions of the first pin 71 and the second pin 72 in the circumferential direction coincide with the slit 43. That is, the nut 60 is inserted into the bolt 30 so that the first pin 71 and the second pin 72 move along the slit 43. When inserted into the bolt 30, the first pin 71 and the second pin 72 move axially in the slit 43. Then, when the bolt 30 is inserted all the way, the first pin 71 reaches the first spiral groove 41. Here, when a force for contracting the spring 63 is applied to further push the member 62, the second pin 72 reaches the second spiral groove 42.

[0073] Next, the bolt 30 or the nut 60 is rotated around the axis. That is, the bolt 30 is rotated around the axis relative to the nut 60. As a result, the first pin 71 moves along the first spiral groove 41, and the second pin 72 moves along the second spiral groove 42. That is, the first pin 71 moves spirally in the first spiral groove 41, and the second pin 72 moves spirally in the second spiral groove 42. That is, as the bolt 30 rotates, the first pin 71 moves from one end of the first spiral groove 41 to the other end in the axial direction and the circumferential direction. Similarly, the second pin 72 moves axially and circumferentially from one end of the second spiral groove 42 to the other end. By rotating the bolt 30 or the nut 60 in the circumferential direction in this way, the bolt 30 and the nut 60 are screwed together.

[0074] When the second pin 72 moves to the other end of the second spiral groove 42, it reaches the slack suppression groove 44. The spring 63 pushes the second nut member 62 in a direction away from the disk-shaped portion 66. Therefore, when the second pin 72 reaches the slack suppression groove 44, it moves along the slack suppression groove 44 toward the end surface 34 side. That is, the second pin 72 is pushed back toward the end surface 34 side of the bolt 30. As a result, the second pin 72 moves to the end portion of the slack suppression groove 44 on the end surface 34 side. Therefore, the gap G between the disk-shaped portion 66 and the second nut member 62 widens in the axial direction.

[0075] By doing so, the bolt 30 and the nut 60 are fixed. That is, Figure 1 The first component 10 and the second component 20 shown in FIG. 1 and the like are fastened in a space S between the head 32 of the bolt 30 and the disk portion 66 of the nut 60 .

[0076] Since the spring 63 pushes the second nut member 62 in a direction away from the head 32, the second pin 72 moves toward the tip side in the slack suppression groove 44. As a result, since the second pin 72 is restricted from moving along the second spiral groove 42, the loosening of the bolt 30 and the nut 60 is suppressed. That is, it is possible to suppress the second pin 72 from returning from the other end of the second spiral groove 42 on the slack suppression groove 44 side to one end on the slit 43 side. Thus, at the time of tightening, the relative rotation between the bolt 30 and the nut 60 is restricted, and the second pin 72 does not move to the slit 43. Thus, it is possible to suppress the bolt 30 from falling off from the nut 60 in the axial direction.

[0077] Next, a method for removing the bolt 30 and the nut 60 will be described. In a state where the bolt 30 and the nut 60 are fixed, as described above, the second pin 72 is inserted into the slack suppression groove 44. That is, the second pin 72 is located on the end surface 34 side of the slack suppression groove 44. The user pushes the second nut member 62 toward the head 32. That is, the user applies an axial force to the second nut member 62 to bring the second nut member 62 closer to the disc-shaped portion 66. Because the spring 63 contracts due to the force of the user, the second pin 72 moves along the slack suppression groove 44 toward the head 32 side. The user pushes the second nut member 62 until the second pin 72 reaches the end of the slack suppression groove 44 on the head 32 side. As a result, because the second pin 72 reaches the second spiral groove 42, the nut 60 is able to rotate around the axis.

[0078] Then, as the user pushes in the second nut member 62, the nut 60 rotates around the axis. By doing so, the second pin 72 moves along the second spiral groove 42. When the second pin 72 moves from the other end to one end of the second spiral groove 42, the second pin 72 reaches the slit 43. Similarly, the first pin 71 moves along the first spiral groove 41. When the first pin 71 moves from the other end to one end of the first spiral groove 41, the first pin 71 reaches the slit 43.

[0079] This enables the nut 60 to be pulled out from the bolt 30. That is, the nut 60 moves in the axial direction so that the disk portion 66 of the nut 60 is separated from the head portion 32 of the bolt 30. The first pin 71 and the second pin 72 move toward the end surface 34 side along the slit 43. Therefore, the user can remove the nut 60 from the bolt 30.

[0080] As described above, the peripheral surface 33 of the shaft portion 31 of the bolt 30 is provided with the first helical groove 41, the second helical groove 42, the slit 43 and the slack suppressing groove 44. In addition, the nut 60 includes the first pin 71 moving along the first helical groove 41 and the second pin 72 moving along the second helical groove 42.

[0081] When the first pin 71 and the second pin 72 are located at the circumferential position of the slit 43, the user can move the nut 60 in the axial direction relative to the bolt 30. The bolt 30 and the nut 60 can be fixed only by inserting the first pin 71 and the second pin 72 into the slit 43 and rotating the nut 60. In addition, when the first pin 71 and the second pin 72 are located in the circumferential direction of the slit 43, the nut 60 can be removed from the bolt 30. When the first pin 71 and the second pin 72 deviate from the circumferential position of the slit 43, the nut 60 cannot be attached to or detached from the bolt 30.

[0082] Then, when the second pin 72 moves from one end to the other end of the second spiral groove 42, the spring 63 pushes the second nut member 62 in a direction away from the head 32. Thus, the second pin 72 moves to the end portion of the slack suppression groove 44 on the tip side. The movement and rotation of the nut 60 relative to the bolt 30 are restricted. That is, the nut 60 cannot rotate about the axis and cannot move in the axial direction.

[0083] In other words, unless the user pushes the second nut member 62 toward the head 32, the nut 60 cannot be removed from the bolt 30. Therefore, the bolt 30 and the nut 60 can be firmly fixed. The loosening of the nut 60 can be suppressed, and the two components can be firmly fastened. That is, the bolt 30 can be suppressed from falling off the nut 60 when the components are fastened.

[0084] Further, the bolt 30 and the nut 60 can be removed by simply rotating the nut 60 around the axis with the nut 60 pushed in. Therefore, simple attachment and removal are possible. No special tools are required for installation and removal. That is, attachment and removal can be performed with the user's own hands or fingers. In addition, durability and workability can be improved.

[0085] Furthermore, the nut 60 is provided with two first pins 71 and two second pins 72. Two first spiral grooves 41, two second spiral grooves 42, two slits 43 and two loosening suppression grooves 44 are formed on the peripheral surface 33 of the bolt 30. This makes it possible to more reliably suppress loosening of the nut 60.

[0086] In this case, the formation range of one first spiral groove 41 can be set to be less than 180° in the circumferential direction. Thus, a pair of first spiral grooves 41 can be formed symmetrically with respect to the central axis AX. Similarly, the formation range of one second spiral groove 42 can be set to be less than 180°. Thus, a pair of second spiral grooves 42 can be formed symmetrically with respect to the central axis AX. Thus, it is possible to more reliably and easily perform installation.

[0087] The first spiral groove 41 may be formed thicker than the second spiral groove 42. For example, the groove width of the first spiral groove 41 may be about 1.5 mm, and the groove width of the second spiral groove 42 may be about 1.2 mm. The first pin 71 may be formed thicker than the second pin 72. The first pin 71 may be thicker than the second spiral groove 42 and thinner than the first spiral groove 41. Thus, it is possible to suppress the first pin 71 from accidentally entering the second spiral groove 42. This makes it possible to suppress the first pin 71 from accidentally entering the second spiral groove 42 on the end side even when the user rotates the nut 60 in the middle of the stroke in the axial direction of the slit 43. Therefore, it is possible to suppress incorrect installation.

[0088] Furthermore, these components may be fastened with a wave washer, an E-ring, or the like sandwiched in the space S between the head 32 of the bolt 30 and the disk portion 66 .

[0089] Fig.10 is a diagram showing an example of a mounting tool using the component fastening structure 1 . Fig.10 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 each part of an affected leg, and a load sensor 222 for detecting a load applied to the sole of a 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 for controlling 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 supporting each part of the affected leg includes a thigh frame 122 and a calf frame 123 rotatably connected to the thigh frame 122. In addition, the frame includes a foot flat frame 124 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 The angle sensor 223 housed in the control unit 121 is, for example, a rotary encoder, which detects the angle of rotation 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-flat 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). The load sensor 222 is, for example, a resistance change detection type load detection sheet in which electrodes are arranged in a matrix.

[0094] The calf frame 123 includes Figure 1 The first component 10 and the second component 20 shown. Then, the first component 10 and the second component 20 are connected by the component fastening structure 1. That is, the user attaches the first component 10 and the second component 20 by 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 reliably fasten the first component 10 and the second component 20 of the calf frame 123. Therefore, the user can easily adjust the frame length. The number of components fastened by the component fastening structure 1 can be 3 or more.

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

Claims

1. A component fastening structure that uses bolts and nuts to fasten components. in, The bolt comprises: A first spiral groove, which is arranged on the circumference of the bolt; a second spiral groove, which is provided on the peripheral surface of the bolt and is provided on the distal end side of the bolt relative to the first spiral groove; a slit provided on the peripheral surface of the bolt along the axial direction and extending from a distal end of the bolt through the second spiral groove to the first spiral groove; and a slack-repressing groove extending from the other end of the second spiral groove toward the terminal side, wherein the nut comprises: a first nut member including a first pin that protrudes from an inner peripheral surface toward a central axis side and is inserted into the first spiral groove; a second nut member including a second pin that protrudes from the inner peripheral surface toward the center axis side and is inserted into the second spiral groove; and A force applying member is disposed between the first nut member and the second nut member and applies force to the first nut member toward the head of the bolt.

2. The component fastening structure according to claim 1, in, The first spiral groove is configured to be thicker than the second spiral groove, wherein the first pin is thicker than the second pin, and Wherein, the first pin is thicker than the second spiral groove.

3. The component fastening structure according to claim 1, in, The first nut member comprises: a cylindrical portion; and a disc-shaped portion protruding from the cylindrical portion to the outer peripheral side, wherein the second nut member is arranged on the outer peripheral side of the cylindrical portion, wherein the cylindrical portion is provided with a through hole extending through the cylindrical portion in a direction orthogonal to the axial direction, wherein the through hole is an elongated hole whose longitudinal direction is consistent with the axial direction, and Wherein, the second pin extends through the through hole.

4. The component fastening structure according to claim 3, in, The urging member is arranged between the disk portion and the second nut member.

5. The component fastening structure according to any one of claims 1 to 4, in, The first nut member is provided with a plurality of the first pins spaced apart from each other in the circumferential direction, wherein the second nut member is provided with a plurality of second pins spaced apart from each other in the circumferential direction, wherein a plurality of the first spiral grooves are arranged corresponding to the first pins, wherein a plurality of the second spiral grooves are arranged corresponding to the second pins, and Wherein, a circumferential angle between the first spiral groove and the second spiral groove is less than 180°.

6. The component fastening structure according to any one of claims 1 to 4, in, The nut is provided with two first pins and two second pins, wherein the two second pins are arranged to face each other with a central axis therebetween, and The two first pins are arranged to face each other with the central axis therebetween.

7. An installation tool worn by a user, the installation tool include: A first component including a plurality of first through holes; a second portion including a second through hole; as well as The component fastening structure according to any one of claims 1 to 6, Wherein, the bolt is inserted through the first through hole and the second through hole.

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