Fastening device

Abstract

To provide a fastening device capable of attaching / detaching a device body and a socket without making the structure of the socket complex.SOLUTION: A fastening device comprises a socket, a device body having a coupling part coupled detachably to the socket, and a retention base retaining the socket. The coupling part comprises a holder, and a sleeve which is movable relative to the holder, and moves to a tip end side of the holder to protrude a sphere radially inward from the holder and also moves to a base end side of the holder to retract the sphere from radially inside the holder. The retention base comprises a guide part which allows the sleeve from the base end side to the tip end side with energizing force of a sprint when the socket moves from a first position toward a second position, and moves the sleeve from the tip end side to the base end side when the socket moves from the second position toward the first position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a fastening device. [Background technology]

[0002] Patent Document 1 discloses a screw fastening system including a screw fastening device having a screw fastening device body and a socket attached to the screw fastening device body, and a socket change unit for attaching and detaching the socket to and from the screw fastening device body. The socket in Patent Document 1 operates by being guided by a guide bar of the socket change unit, and has a mechanism for attaching and detaching the socket to and from the screw fastening device body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-24679 Summary of the Invention [Problem to be solved by the invention]

[0004] In the screw fastening system of Patent Document 1, an attachment / detachment mechanism for attaching and detaching the socket to and from the screw fastening device body is arranged in the socket, which causes a problem that the structure of the socket becomes complicated. In particular, when multiple sockets are prepared according to the specifications of the nuts, the above-mentioned attachment / detachment mechanism needs to be arranged in each socket, which increases the manufacturing cost of the entire screw fastening system.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a fastening device that allows the device body and the socket to be attached and detached without complicating the structure of the socket. [Means for solving the problem]

[0006] One aspect of the present invention is A socket extending in an axial direction and having a head portion at one end in the axial direction that is polygonal when viewed along the axial direction; a device body including a shaft rotatable about a rotation axis extending along the axial direction, and a connecting portion that detachably connects the shaft and the socket so that the socket rotates integrally with the shaft; a holder for holding the socket; Equipped with The connecting portion is a cylindrical holder having a tip end at which a housing portion for housing the head portion is disposed and a base end disposed on the opposite side of the tip end in the axial direction, the housing portion being polygonal when viewed along the axial direction; a sphere held in a holding hole provided in the holder so as to be capable of protruding radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, and that moves toward the tip side of the holder to cause the sphere to protrude radially inward from the inner circumferential surface of the holder, and moves toward the base end side of the holder to cause the sphere to retreat radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, the spring elastically biasing the sleeve toward the tip side of the holder; Equipped with The socket is an outer circumferential groove extending in a circumferential direction on an outer circumferential surface of the socket, into which the sphere is fitted; a first engagement portion that is disposed on an opposite side of the head portion with respect to the outer circumferential groove in the axial direction and extends in the circumferential direction on the outer circumferential surface of the socket; Equipped with The holding table is a second engagement portion that engages with the first engagement portion to guide the socket between the first position and the second position and to hold the socket; a guide portion that allows movement of the sleeve from the base end side to the tip end side due to the biasing force of the spring when the socket moves from the first position toward the second position, and moves the sleeve from the tip end side to the base end side when the socket moves from the second position toward the first position; A fastening device comprising: Effect of the Invention

[0007] According to the present invention, it is possible to provide a fastening device that allows the device body and the socket to be attached and detached without complicating the structure of the socket. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a fastening device according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a half-sectional view of the fastening device shown in FIG. [Diagram 3] FIG. 3 is a plan view of a fastening device body according to one embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of a support table according to one embodiment of the present invention. [Diagram 5] FIG. 5 is a perspective view for explaining the attachment and detachment operation of the fastening device main body and the socket shown in FIG. [Figure 6] FIG. 6 is a half-sectional view for explaining the attachment and detachment operation of the fastening device main body and the socket shown in FIG. [Figure 7] FIG. 7 is a perspective view for explaining the attachment and detachment operation of the fastening device main body and the socket shown in FIG. [Figure 8] FIG. 8 is a half-sectional view for explaining the attachment and detachment operation of the fastening device main body and the socket shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A fastening device according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Note that the following description is essentially merely illustrative and is not intended to limit the present invention, its applications, or its uses. The drawings are schematic, and the ratios of dimensions, etc. differ from the actual ones.

[0010] [Overall configuration] Fig. 1 is a perspective view of a fastening device 1 according to this embodiment. Fig. 2 is a half-side cross-sectional view of the fastening device 1 according to this embodiment. The fastening device 1 of this embodiment is a nut runner used for fastening a nut (not shown).

[0011] In the following description, the left-right direction in Fig. 2 may be referred to as the X direction, the depth direction in Fig. 2 may be referred to as the Y direction, and the up-down direction in Fig. 2 may be referred to as the Z direction. In particular, the right side in Fig. 2 may be referred to as the +X side, the left side as the -X side, the front side as the +Y side, the back side as the -Y side, the upper side as the +Z side, and the lower side as the -Z side. In this embodiment, the X direction, the Y direction, and the Z direction are mutually orthogonal. In this embodiment, the Z direction is the vertical direction.

[0012] 1 and 2, a fastening device 1 includes a socket 10, a device body 20 to which the socket 10 is detachably attached, and a holder 30 that holds the socket 10. As shown in FIG.

[0013] [socket] The socket 10 rotates about a rotation axis C by a driving force transmitted from the device body 20, thereby tightening a screw such as a nut (not shown). In the following description, the direction in which the rotation axis C extends may be simply referred to as the axial direction. Also, the circumferential direction of a virtual circle centered on the axial direction may be simply referred to as the circumferential direction, and the radial direction of a virtual circle centered on the axial direction may be simply referred to as the radial direction. Also, in this embodiment, when the socket 10 is held by the holder 30 as shown in FIG. 1, the axial direction extends along the Z direction. That is, in the following description, the Z direction and the axial direction can be interchanged.

[0014] The socket 10 has a generally cylindrical socket body 11 extending along the axial direction, and a polygonal columnar head 12 disposed at one axial end (the end on the +Z side) of the socket body 11. The socket 10 includes a magnetic material. The socket 10 is made of a ferromagnetic material. The material of the socket 10 in this embodiment is iron.

[0015] The socket body 11 includes a cylindrical small diameter portion 11a and a cylindrical large diameter portion 11b having an outer diameter larger than that of the small diameter portion 11a. The small diameter portion 11a is a portion on one side (+Z side) of the socket body 11 in the axial direction, and the large diameter portion 11b is a portion on the other side (-Z side) of the socket body 11 in the axial direction. In other words, the small diameter portion 11a is disposed between the head 12 and the large diameter portion 11b in the axial direction.

[0016] As shown in Fig. 2, the socket 10 has a nut accommodating recess 13 that receives a screw such as a nut (not shown). The nut accommodating recess 13 is disposed at the other end (the end on the -Z side) of the socket body 11 in the axial direction. The nut accommodating recess 13 is disposed in the large diameter portion 11b. The nut accommodating recess 13 of this embodiment is hexagonal when viewed along the axial direction.

[0017] 1 and 2, the socket 10 includes a first groove 14 that extends in the circumferential direction on the outer peripheral surface of the socket body 11 and is recessed radially inward from the outer peripheral surface of the socket body 11. The first groove 14 is disposed on one side (+Z side) of the socket body 11 in the axial direction. The first groove 14 is disposed in the small diameter portion 11a. The first groove 14 extends over the entire circumference of the outer peripheral surface of the socket body 11. The first groove 14 is a round groove. In other words, the first groove 14 is curved and recessed radially inward from the outer peripheral surface of the socket body 11 in a cross section including the rotation axis C (for example, the cross section shown in FIG. 2). The first groove 14 of this embodiment is an example of an outer peripheral groove according to the present invention.

[0018] The socket 10 includes a second groove 15 extending in the circumferential direction on the outer peripheral surface of the socket body 11 and recessed radially inward from the outer peripheral surface of the socket body 11. The second groove 15 is disposed on the outer peripheral surface of the socket body 11 on the opposite side to the head 12 with respect to the first groove 14 in the axial direction. In other words, the second groove 15 is disposed on the outer peripheral surface of the socket body 11 on the nut accommodating recess 13 side with respect to the first groove 14 in the axial direction. In further words, the second groove 15 is disposed on the -Z side with respect to the first groove 14. The second groove 15 is disposed in the large diameter portion 11b. The second groove 15 extends over the entire circumference of the outer peripheral surface of the socket body 11. The second groove 15 of this embodiment is a V-groove. In other words, the second groove 15 of this embodiment is recessed radially inward from the outer peripheral surface of the socket body 11 in a V-shape in a cross section including the rotation axis C (for example, the cross section shown in FIG. 2). The second groove 15 of the present embodiment is an example of a first engagement portion according to the present invention.

[0019] Head 12 has a so-called insertion angle. Head 12 protrudes from one end (end on the +Z side) in the axial direction of socket body 11 to one side in the axial direction (the +Z side). Head 12 has a generally rectangular prism shape. In other words, head 12 has a generally rectangular shape when viewed along the axial direction.

[0020] [Device body] The device body 20 includes a shaft 21, a cylindrical cover 22 that covers the shaft 21 from the radially outer side, and a connecting portion 40 for connecting the shaft 21 and the socket 10.

[0021] The shaft 21 extends along the axial direction. The shaft 21 is arranged coaxially with the socket 10 in a state where the shaft 21 is connected to the socket 10 by the connecting portion 40. The shaft 21 is mechanically connected to the power source 23. The shaft 21 rotates about the rotation axis C by the power transmitted from the power source 23. The device body 20 transmits the power of the power source 23 to the socket 10. By the rotation of the shaft 21 connected to the socket 10 by the connecting portion 40, the socket 10 rotates about the rotation axis C in conjunction with the rotation of the shaft 21.

[0022] The cover 22 supports the shaft 21 so that the shaft 21 can rotate around a rotation axis C. The cover 22 is mechanically connected to an orthogonal robot 24. The device body 20 is moved along three axes, the X direction, the Y direction, and the Z direction, by the orthogonal robot.

[0023] The connecting part 40 connects the socket 10 and the shaft 21 so that the socket 10 and the shaft 21 rotate together about a rotation axis C. As shown in FIG. 2, the connecting part 40 includes a holder 41, a steel ball 42, a sleeve 43, and a spring 44.

[0024] The holder 41 is cylindrical and extends along the axial direction. The holder 41 has a tip 41a and a base end 41b arranged on the opposite side of the tip 41a in the axial direction. In other words, the tip 41a is arranged on the -Z side of the holder 41, and the base end 41b is arranged on the +Z side of the holder 41. The base end 41b of the holder 41 is mechanically connected to the shaft 21. The holder 41 rotates about the rotation axis C as the shaft 21 rotates.

[0025] The holder 41 includes a socket accommodating portion 45 for accommodating the socket 10. The socket accommodating portion 45 is a space defined by the inner peripheral surface of the cylindrical holder 41 and opening at the tip 41a. The socket accommodating portion 45 is disposed on the tip 41a side (-Z side) of the holder 41. The socket accommodating portion 45 includes a first portion 46 for accommodating the head 12 of the socket 10 and a second portion 47 for accommodating the small diameter portion 11a of the socket 10.

[0026] FIG. 3 is a plan view of the device body 20 as viewed from the tip 41a side of the holder 41 along the axial direction.

[0027] The first portion 46 is a so-called drive angle corresponding to the insertion angle of the socket 10. As shown in FIG. 3, the first portion 46 is polygonal when viewed along the axial direction. Specifically, the first portion 46 of the present embodiment is a star-shaped polygon when viewed along the axial direction. More specifically, the first portion 46 of the present embodiment is polygonal when viewed along the axial direction, consisting of three squares Sq1, Sq2, and Sq3 arranged circumferentially shifted from each other by 30° around the rotation axis C. Each of the three squares Sq1, Sq2, and Sq3 included in the first portion 46 when viewed along the axial direction is slightly larger than the shape of the head 12 when viewed along the axial direction so that the head 12 can be inserted. The angle of the twelve convex angles included in the first portion 46 when viewed along the axial direction is 90°. In other words, the first portion 46 of the present embodiment is a so-called triple square. The first portion 46 of the present embodiment is an example of a housing part according to the present invention.

[0028] The second portion 47 has a circular shape when viewed in the axial direction. The second portion 47 is slightly larger than the small diameter portion 11a (shown in FIGS. 1 and 2) of the socket 10 so that the small diameter portion 11a can be inserted into the second portion 47.

[0029] 2 and 3, the holder 41 has an inner circumferential surface 48 that defines the socket accommodating portion 45 in the radial direction. The inner circumferential surface 48 has a first inner circumferential surface 48a that defines the first portion 46 in the radial direction, and a second inner circumferential surface 48b that defines the second portion 47 in the radial direction. The inner circumferential surface 48 also has a first inclined surface 48c that is disposed between the first inner circumferential surface 48a and the second inner circumferential surface 48b and extends radially outwardly toward the tip 41a side (-Z side) in the axial direction. The inner circumferential surface 48 has a second inclined surface 48d that is disposed closer to the tip 41a side (-Z side) than the second inner circumferential surface 48b and extends radially outwardly toward the tip 41a side (-Z side) in the axial direction.

[0030] As shown in Fig. 2, the holder 41 has two retaining holes 41c for retaining the steel balls 42. The two retaining holes 41c are arranged at equal intervals in the circumferential direction. Each retaining hole 41c retains one steel ball 42. The retaining hole 41c penetrates the holder 41 in the radial direction, and communicates between the second portion 47 and a space radially outward of the outer circumferential surface of the holder 41.

[0031] The steel ball 42 is held in the holding hole 41c of the holder 41 so as to be able to protrude radially inward from the second inner circumferential surface 48b of the holder 41. Specifically, the steel ball 42 is able to protrude into the second portion 47. The steel ball 42 protrudes into the second portion 47 with the small diameter portion 11a of the socket 10 housed in the second portion 47, thereby fitting into the first groove 14 of the socket 10. The steel ball 42 according to this embodiment is an example of a sphere according to the present invention.

[0032] The sleeve 43 of this embodiment is cylindrical. The sleeve 43 is elastically biased toward the tip 41a side (-Z side) of the holder 41 by a spring 44 arranged in a compressed state between the holder 41 and the sleeve 43. A stopper 41d arranged at the tip 41a of the holder 41 restricts the movement of the sleeve 43 toward the -Z side. An inner peripheral groove 43a recessed radially outward from the inner peripheral surface of the sleeve 43 is arranged on the -Z side of the sleeve 43. The surface of the sleeve 43 of this embodiment is plated to improve slidability. In other words, a plated film to improve slidability is arranged on the surface of the sleeve 43. For example, the surface of the sleeve 43 may be hard chrome plated.

[0033] As shown in Fig. 2, when the sleeve 43 is in contact with the stopper 41d of the holder 41, the steel ball 42 is pushed radially inward by the inner circumferential surface of the sleeve 43 and protrudes into the inside of the holder 41. In contrast, when the sleeve 43 moves from the state shown in Fig. 2 toward the base end 41b of the holder 41 against the biasing force of the spring 44, the steel ball 42 can retreat into the inner circumferential groove 43a.

[0034] The spring 44 is disposed in a compressed state between the holder 41 and the sleeve 43. The spring 44 presses the sleeve 43 toward the tip 41a of the holder 41.

[0035] [Holding stand] Fig. 4 is a perspective view of the holder 30. Referring to Fig. 4, the holder 30 is U-shaped when viewed along the axial direction. The holder 30 includes a base 31 and two extensions 32A and 32B extending from the base 31 in parallel to each other toward the +Y side. In the following description, when there is no need to particularly distinguish between the two extensions 32A and 32B, one of the two extensions 32A and 32B may be simply referred to as the extension 32.

[0036] The holding base 30 includes a protrusion 33 protruding from the inner side of the base 31 and the extensions 32A and 32B. Specifically, the protrusion 33 protrudes from the inner side of each of the base 31 and the extensions 32A and 32B, which are connected in a U-shape when viewed along the axial direction. The protrusion 33 extends in a U-shape when viewed along the axial direction. The portion of the protrusion 33 arranged on the base 31 protrudes to the +Y side from a curved side surface located on the +Y side of the base 31, and extends in the X direction while curved convexly to the -Y side when viewed along the axial direction. The portion of the protrusion 33 arranged on the extension 32A protrudes to the -X side from the -X side side of the extension 32A and extends in the Y direction. The portion of the protrusion 33 arranged on the extension 32B protrudes to the +X side from the +X side side of the extension 32B and extends in the Y direction. The protrusion 33 of this embodiment is an example of a second engagement portion according to the present invention.

[0037] The protrusion 33 is configured to fit into the second groove 15 (shown in FIG. 2) of the socket 10. Specifically, the protrusion 33 is V-shaped in a cross section perpendicular to the direction in which the protrusion 33 extends (for example, the cross section shown in FIG. 2). The protrusion 33 fits into the second groove 15 of the socket 10, and guides the socket 10 in the Y direction between the first position (the position of the socket 10 shown in FIGS. 5 and 6) and the second position (the position of the socket 10 shown in FIGS. 7 and 8), while supporting the socket 10.

[0038] The holding base 30 has a guide portion 34 arranged on the upper portion of the holding base 30. The guide portion 34 is arranged on the +Z side of the upper surface 32a of the extending portion 32, and has a first surface 34a extending in the X direction and the Y direction that contacts the sleeve 43 when the socket 10 is in the first position. The guide portion 34 is provided so as to be continuous with the first surface 34a and the upper surface 32a of the extending portion 32, and has a second surface 34b that is inclined downward from the first surface 34a side toward the upper surface 32a side of the extending portion 32 in the direction in which the extending portion 32 extends. In other words, the guide portion 34 is provided so as to be continuous with the first surface 34a and the upper surface 32a of the extending portion 32, and has a second surface 34b that is inclined toward the -Z side from the -Y side toward the +Y side.

[0039] The second surface 34b of the guide portion 34 allows the sleeve 43 to move from the base end 41b side to the tip end 41a side due to the biasing force of the spring 44 when the socket 10 moves from the first position to the second position, and moves the sleeve 43 from the tip end 41a side to the base end 41b side against the biasing force of the spring 44 when the socket 10 moves from the second position to the first position. The surface of the guide portion 34 in this embodiment is plated to improve slidability. In other words, a plated film to improve slidability is disposed on the surface of the guide portion 34. For example, the guide portion 34 may be hard chrome plated.

[0040] The holder 30 has an integral structure. In other words, the base 31, the extension 32, the protrusion 33, and the guide 34 are integrally formed.

[0041] Six magnets 50A-50F for holding the socket 10 in the first position are removably attached to the holding base 30. In the following description, when there is no need to particularly distinguish between the six magnets 50A-50F, one of the six magnets 50A-50F may be simply referred to as magnet 50.

[0042] Of the six magnets 50A to 50F, two magnets 50A and 50B are attached to the base 31. The two magnets 50A and 50B attached to the base 31 are arranged side by side in the Z direction with the protrusion 33 between them.

[0043] Of the six magnets 50A to 50F, the other two magnets 50C and 50D (shown in FIG. 2) are attached to the extending portion 32A, and the other two magnets 50E and 50F are attached to the extending portion 32B. The two magnets 50C and 50D attached to the extending portion 32A are arranged side by side in the Z direction with the protrusion 33 in between, and the two magnets 50E and 50F attached to the extending portion 32B are arranged side by side in the Z direction with the protrusion 33 in between.

[0044] 2, the magnet 50 is disposed in a mounting hole 30a disposed in the holder 30. The magnet 50 has a stepped shape, and is prevented from falling out of the mounting hole 30a by contacting a step protruding from the inner circumferential surface that defines the mounting hole 30a. The magnet 50 is held in the mounting hole 30a by a set screw 51.

[0045] [Attaching and detaching the device body and socket]

[0046] Hereinafter, the attachment and detachment operation of the device body 20 and the socket 10 will be described with reference to Figs. 1-2 and 5-8. Fig. 5 is a perspective view of the fastening device 1 when the socket 10 is in a first position. Fig. 6 is a cross-sectional view of the fastening device 1 in the state shown in Fig. 5, taken in a cross section including the rotation axis C and extending in the X direction and Y direction. Fig. 7 is a perspective view of the fastening device 1 when the socket 10 is in a second position. Fig. 8 is a cross-sectional view of the fastening device 1 in the state shown in Fig. 7, taken in a cross section including the rotation axis C and extending in the X direction and Y direction.

[0047] The operation of the fastening device 1 when mounting the socket 10 to the device body 20 will now be described.

[0048] First, as shown in Fig. 1 and Fig. 2, the socket 10 is set on the holder 30. At this time, the socket 10 is set in the first position. The socket 10 is held on the holder 30 by fitting the protrusion 33 of the holder 30 into the second groove 15 of the socket 10. At this time, a mutually attractive force acts between the socket 10 and the magnet 50, and the socket 10 is prevented from unintentionally moving from the first position.

[0049] Next, as shown in Figs. 5 and 6, the device body 20 arranged coaxially with the socket 10 is moved to the -Z side, and the socket 10 is partially accommodated in the socket accommodating portion 45 (shown in Fig. 2) of the connecting portion 40. Specifically, the head 12 of the socket 10 is accommodated in the first portion 46 (shown in Fig. 2) of the socket accommodating portion 45, and the small diameter portion 11a of the socket 10 is accommodated in the second portion 47 (shown in Fig. 2) of the socket accommodating portion 45. While the device body 20 is moving to the -Z side, the shaft 21 rotates about the rotation axis C, and when the first portion 46 of the socket accommodating portion 45 and the head 12 of the socket 10 are aligned in the circumferential direction, the head 12 is inserted into the first portion 46. In the state shown in Figs. 5 and 6, the sleeve 43 is pushed up toward the base end 41b by the first surface 34a included in the guide portion 34 of the holder 30, and the steel ball 42 can be retreated to the inner circumferential groove 43a of the sleeve 43.

[0050] Next, with the socket 10 accommodated in the socket accommodation portion 45, the device body 20 is moved horizontally to the +Y side by the Cartesian robot 24. At this time, in association with the movement of the device body 20, the socket 10 is guided by the protrusion portion 33 and moves horizontally away from the base 31, that is, to the +Y side. As the socket 10 moves horizontally, the sleeve 43 is guided to the -Z side by the second surface 34b of the guide portion 34.

[0051] 7 and 8, when the socket 10 moves to the second position, the sleeve 43 comes into contact with the stopper 41d, and the steel ball 42 protrudes radially inward of the holder 41. As a result, the steel ball 42 fits into the first groove 14 of the socket 10, and the device body 20 and the socket 10 are connected in the axial direction.

[0052] The operation of the fastening device 1 when removing the socket 10 from the device body 20 will now be described.

[0053] With the device body 20 and the socket 10 connected together, the socket 10 is moved horizontally from the second position to the first position, whereby the sleeve 43 moves toward the +Z side along the second surface 34b of the guide portion 34 against the biasing force of the spring 44. When the socket 10 reaches the first position, the steel ball 42 becomes retractable into the inner circumferential groove 43a of the sleeve 43, and the connection between the device body 20 and the socket 10 is released. Thereafter, the device body 20 is moved upward, whereby the socket 10 is removed from the device body 20.

[0054] [effect] The fastening device 1 according to this embodiment provides the following advantageous effects.

[0055] According to the fastening device 1 of this embodiment, the protrusion 33 of the holder 30 fits into the second groove 15 of the socket 10 to guide the socket 10 between the first position and the second position. When the socket 10 moves from the first position to the second position with the head 12 accommodated in the first portion 46 of the socket accommodation portion 45 of the coupling portion 40, the guide portion 34 allows the sleeve 43 to move from the base end 41b side to the tip end 41a side due to the biasing force of the spring 44. As a result, when the socket 10 moves from the first position to the second position, the steel ball 42 protrudes radially inward from the second inner circumferential surface 48b of the holder 41 and fits into the second groove 15 of the socket 10, thereby coupling the device body 20 and the socket 10. In addition, when the socket 10 moves from the second position to the first position in a state where the device body 20 and the socket 10 are connected, the guide portion 34 moves the sleeve 43 from the tip end 41a side to the base end 41b side against the biasing force of the spring 44. As a result, when the socket 10 moves from the second position to the first position, the steel ball 42 retreats radially outward from the second inner circumferential surface 48b of the holder 41, and the connection between the device body 20 and the socket 10 is released. As described above, according to the fastening device 1 of this embodiment, the device body 20 and the socket 10 can be attached and detached by moving the socket 10 between the first position and the second position. In addition, according to the fastening device 1 of this embodiment, since the connecting portion 40 for attaching and detaching the device body 20 and the socket 10 is arranged in the device body 20, it is not necessary to provide the socket 10 with a mechanism for attaching and detaching the device body 20 and the socket 10, and the structure of the socket 10 can be simplified. This is particularly useful when a plurality of sockets 10 are prepared according to the specifications of the nuts, since it makes it possible to suppress an increase in the manufacturing cost of the fastening device 1.

[0056] The fastening device 1 according to this embodiment is attached to the holder 30 and includes a plurality of magnets 50 for holding the socket 10 in the first position. With this configuration, an attractive force acts between the socket 10 and the magnets 50, thereby preventing the socket 10 from unintentionally moving from the first position. As a result, the socket 10 can be reliably attached to and detached from the device body 20.

[0057] The magnet 50 of the present embodiment is detachably attached to the holder 30. With this configuration, by attaching and detaching the magnet 50, the force with which the socket 10 is held can be adjusted.

[0058] The first portion 46 of the present embodiment has a star-shaped polygonal shape in which a plurality of squares Sq1, Sq2, and Sq3 corresponding to the shape of the head 12 are arranged circumferentially offset from each other around the rotation axis C as viewed along the axial direction. With this configuration, when the head 12 of the socket 10 is inserted into the first portion 46, one of the three squares Sq1, Sq2, and Sq3 included in the first portion 46 is aligned with the head 12 in the circumferential direction, so that the head 12 can be inserted into the first portion 46. This makes it easier to insert the head 12 of the socket 10 into the first portion 46 compared to a case in which the first portion 46 has only one square corresponding to the shape of the head 12 as viewed along the axial direction. As a result, the time required for coupling the socket 10 and the device body 20 can be shortened.

[0059] In this embodiment, a plating film is disposed on the surface of the sleeve 43 to improve sliding properties. This configuration can reduce friction between the sleeve 43 and the guide portion 34. As a result, with the head 12 housed in the first portion 46 of the socket housing portion 45 of the connecting portion 40, the socket 10 can be easily moved from the first position to the second position. Similarly, with the device body 20 and the socket 10 connected to each other, the socket 10 can be easily moved from the second position to the first position.

[0060] In this embodiment, a plating film is disposed on the surface of the guide portion 34 to improve slidability. This configuration can reduce friction between the sleeve 43 and the guide portion 34. As a result, with the head 12 housed in the first portion 46 of the socket housing portion 45 of the connecting portion 40, the socket 10 can be easily moved from the first position to the second position. Similarly, with the device body 20 and the socket 10 connected to each other, the socket 10 can be easily moved from the second position to the first position.

[0061] The inner peripheral surface 48 of the holder 41 in this embodiment is disposed between the first inner peripheral surface 48a and the second inner peripheral surface 48b, and includes a first inclined surface 48c that is inclined radially outward toward the tip 41a side (-Z side) in the axial direction. According to this configuration, the first inclined surface 48c comes into contact with the head 12 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, and guides the socket 10 toward the radially inner side of the holder 41. Specifically, the first inclined surface 48c comes into contact with the head 12 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, and guides the head 12 toward the first portion 46 of the socket accommodating portion 45. As a result, it is possible to easily insert the head 12 of the socket 10 into the first portion 46, and it is possible to shorten the time required for connecting the socket 10 and the device main body 20.

[0062] The inner peripheral surface 48 of the holder 41 in this embodiment is disposed closer to the tip 41a side (-Z side) than the second inner peripheral surface 48b, and includes a second inclined surface 48d that extends radially outwardly toward the tip 41a side (-Z side) in the axial direction. According to this configuration, the second inclined surface 48d comes into contact with the head 12 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, and guides the socket 10 toward the radial inside of the holder 41. Specifically, the second inclined surface 48d comes into contact with the head 12 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, and guides the head 12 toward the second portion 47 of the socket accommodating portion 45. As a result, it is possible to easily insert the socket 10 into the second portion 47, and it is possible to shorten the time required for connecting the socket 10 and the device main body 20.

[0063] (Other variations) The fastening device according to the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

[0064] In the above embodiment, the head 12 is in a substantially quadrangular prism shape, but the head 12 according to the present invention is not limited to this and may be in another polygonal prism shape, such as a substantially hexagonal prism shape or a substantially dodecagonal prism shape, for example. Also, in the above embodiment, the head 12 is in a substantially quadrangular shape when viewed along the axial direction, but the head according to the present invention is not limited to this and may be in another polygonal shape, such as a substantially hexagonal shape or a substantially dodecagonal shape, when viewed along the axial direction.

[0065] In the above embodiment, the first groove 14 is described as an example of the first engagement portion according to the present invention, and the protrusion 33 is described as an example of the second engagement portion according to the present invention, but the present invention is not limited to this. The first engagement portion according to the present invention may be a protrusion protruding from the socket 10, and the second engagement portion according to the present invention may be a groove recessed from the inner surface of the holder 30.

[0066] In the above embodiment, the protrusions 33 are disposed on the inner surfaces of the base 31 and the extending portions 32A and 32B, but this is not limiting, and the protrusions 33 may be disposed only on the extending portions 32A and 32B.

[0067] In the above embodiment, multiple magnets 50 were attached to the holding base 30, but this is not limited to this, and it is also possible that no magnets 50 are attached to the holding base 30, or that only one magnet 50 is attached to the holding base 30.

[0068] In the above embodiment, the magnet 50 is detachably attached to the holder 30, but this is not limiting, and the magnet 50 may be fixed to the holder 30 so that it cannot be removed.

[0069] In the above embodiment, the first portion 46 of the socket housing 45 has a star-shaped polygonal shape in which a plurality of polygons corresponding to the shape of the head 12 are arranged circumferentially shifted from one another around the rotation axis C as viewed along the axial direction, but is not limited thereto. The first portion 46 of the socket housing 45 may have a shape having only one polygon corresponding to the shape of the head 12 as viewed along the axial direction.

[0070] In the above embodiment, the nut accommodating recess 13 has a hexagonal shape when viewed along the axial direction, but is not limited thereto, and may have a star-shaped polygonal shape in which a plurality of hexagonal shapes corresponding to the shape of the nut (not shown) are arranged at a circumferential offset from each other around the rotation axis C. The nut accommodating recess 13 may have a star-shaped polygonal shape consisting of, for example, two hexagonal shapes arranged at a circumferential offset of 30° from each other around the rotation axis C. In other words, the nut accommodating recess 13 may be a so-called double hexagon. In this case, it is possible to easily insert the nut into the nut accommodating recess 13.

[0071] In the above embodiment, both the sleeve 43 and the guide portion 34 are plated to improve slidability, but this is not limited to this. Either the sleeve 43 or the guide portion 34 may be plated to improve slidability, or neither the sleeve 43 nor the guide portion 34 may be plated to improve slidability.

[0072] In the above embodiment, the holder 30 has an integral structure, but is not limited thereto. The holder 30 may be configured by mechanically connecting the base 31, the extension 32, the protrusion 33, and the guide 34, which are manufactured separately.

[0073] [Note] The fastening device according to the present invention provides the following features.

[0074] [Aspect 1] A socket extending in an axial direction and having a head portion at one end in the axial direction that is polygonal when viewed along the axial direction; a device body including a shaft rotatable about a rotation axis extending along the axial direction, and a connecting portion that detachably connects the shaft and the socket so that the socket rotates integrally with the shaft; a holder for holding the socket; Equipped with The connecting portion is a cylindrical holder having a tip end at which a housing portion for housing the head portion is disposed and a base end disposed on the opposite side of the tip end in the axial direction, the housing portion being polygonal when viewed along the axial direction; a sphere held in a holding hole provided in the holder so as to be capable of protruding radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, and that moves toward the tip side of the holder to cause the sphere to protrude radially inward from the inner circumferential surface of the holder, and moves toward the base end side of the holder to cause the sphere to retreat radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, the spring elastically biasing the sleeve toward the tip side of the holder; Equipped with The socket is an outer circumferential groove extending in a circumferential direction on an outer circumferential surface of the socket, into which the sphere is fitted; a first engagement portion that is disposed on an opposite side of the head portion with respect to the outer circumferential groove in the axial direction and extends in the circumferential direction on the outer circumferential surface of the socket; Equipped with The holding table is a second engagement portion that engages with the first engagement portion to guide the socket between the first position and the second position and to hold the socket; a guide portion that allows movement of the sleeve from the base end side to the tip end side due to the biasing force of the spring when the socket moves from the first position toward the second position, and moves the sleeve from the tip end side to the base end side when the socket moves from the second position toward the first position; A fastening device comprising:

[0075] [Aspect 2] the first engagement portion is a groove recessed from the outer circumferential surface of the socket, The fastening device according to aspect 1, wherein the second engagement portion is a protrusion protruding from the holding base.

[0076] [Aspect 3] the socket comprises a magnetic material; 3. The fastening device of claim 1 or 2, further comprising at least one magnet attached to the holder base for holding the socket in the first position.

[0077] [Aspect 4] 4. The fastening device according to claim 3, wherein the at least one magnet is removably attached to the holder.

[0078] [Aspect 5] Provided is a fastening device according to any one of aspects 1 to 4, wherein the accommodating portion has a star-shaped polygonal shape when viewed along the axial direction, in which a plurality of polygons corresponding to the shape of the head are arranged offset from each other in the circumferential direction around the rotation axis. [Explanation of symbols]

[0079] 1 Fastening device 10 Sockets 11 Socket body 11a Small diameter section 11b Large diameter section 12 Head 13 Nut receiving recess 14 First groove (peripheral groove) 15 Second groove (first engagement portion) 20. Device body 21 Shaft 22 Cover 23 Power source 24 Cartesian Robot 30 Holding stand 31 Base 32 Extension 33 Projection (second engagement part) 34 Information Department 34a 1st page 34b 2nd side 40 Connection part 41 Holder 41a Tip 41b Proximal end 41c holding hole 41d Stopper 42 Steel ball (sphere) 43 Sleeve 43a Inner circumferential groove 44 Spring 45 Socket housing 46 Part 1 47 Part 2 48 Inner surface 48a 1st inner surface 48b 2nd inner circumferential surface 48c 1st slope 48d 2nd slope 50 Magnet 51 Setscrew C Rotation axis

Claims

1. A socket extending in an axial direction and having a head portion at one end in the axial direction that is polygonal when viewed along the axial direction; a device body including a shaft rotatable about a rotation axis extending along the axial direction, and a connecting portion that detachably connects the shaft and the socket so that the socket rotates integrally with the shaft; a holder for holding the socket; Equipped with The connecting portion is a cylindrical holder having a tip end at which a housing portion for housing the head portion is disposed and a base end disposed on the opposite side of the tip end in the axial direction, the housing portion being polygonal when viewed along the axial direction; a sphere held in a holding hole provided in the holder so as to be capable of protruding radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, and that moves toward the tip side of the holder to cause the sphere to protrude radially inward from the inner circumferential surface of the holder, and moves toward the base end side of the holder to cause the sphere to retreat radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, the spring elastically biasing the sleeve toward the tip side of the holder; Equipped with The socket is an outer circumferential groove extending in a circumferential direction on an outer circumferential surface of the socket, into which the sphere is fitted; a first engagement portion that is disposed on an opposite side of the head portion with respect to the outer circumferential groove in the axial direction and extends in the circumferential direction on the outer circumferential surface of the socket; Equipped with The holding table is a second engagement portion that engages with the first engagement portion to guide the socket between the first position and the second position and to hold the socket; a guide portion that allows movement of the sleeve from the base end side to the tip end side due to the biasing force of the spring when the socket moves from the first position toward the second position, and moves the sleeve from the tip end side to the base end side when the socket moves from the second position toward the first position; A fastening device comprising:

2. the first engagement portion is a groove recessed from the outer circumferential surface of the socket, The fastening device according to claim 1 , wherein the second engagement portion is a protrusion protruding from the holding base.

3. the socket comprises a magnetic material; The fastening device of claim 1 , further comprising at least one magnet attached to the rest for retaining the socket in the first position.

4. The fastening device according to claim 3 , wherein the at least one magnet is removably attached to the holding base.

5. 2. The fastening device according to claim 1, wherein the accommodating portion has a star-shaped polygonal shape when viewed along the axial direction, in which a plurality of polygons corresponding to the shape of the head are arranged offset from one another in the circumferential direction around the rotation axis.

Images