Associative 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 that includes a screw fastening device having a screw fastening device main body and a socket attached to the screw fastening device main body, and a socket change unit for attaching and detaching the socket to and from the screw fastening device main 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 main body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application 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 the screw fastening device main body is arranged in the socket, which causes a problem of a complicated socket structure. In particular, when multiple sockets are prepared according to the nut specifications, the above-mentioned attachment / detachment mechanism must be arranged in each socket, which increases the manufacturing cost of the entire screw fastening system.

[0005] SUMMARY OF THE INVENTION 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 polygonal head at one end of the axial direction when viewed along the axial direction; a device body having 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 able to protrude radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, that moves toward the tip end side of the holder to cause the spheres to protrude radially inward from the inner circumferential surface of the holder, and that moves toward the base end side of the holder to cause the spheres to retract radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, and 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 the opposite side of the head portion with respect to the outer circumferential groove in the axial direction and that 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 the sleeve to move 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 that 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 is provided, comprising: [Effects 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 explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a fastening device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a half-sectional view of the fastening device shown in FIG. [Figure 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. [Figure 5] FIG. 5 is a perspective view for explaining the attaching and detaching operation of the fastening device main body and the socket shown in FIG. [Figure 6] 6 is a half-sectional view illustrating the attachment and detachment operation of the fastening device body and the socket shown in FIG. [Figure 7] FIG. 7 is a perspective view for explaining the attaching and detaching operation of the fastening device main body and the socket shown in FIG. [Figure 8] 8 is a half-sectional view illustrating the attachment and detachment operation of the fastening device body and the socket shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[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 an example 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 those of the actual objects.

[0010] [Overall configuration] Fig. 1 is a perspective view of a fastening device 1 according to this embodiment. Fig. 2 is a half-sectional view of the fastening device 1 according to this embodiment. The fastening device 1 of this embodiment is a nut runner used to fasten 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 depth 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 perpendicular to one another. In this embodiment, the Z direction is the vertical direction.

[0012] 1 and 2, the 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.

[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. Furthermore, the circumferential direction of an imaginary circle centered on the axial direction may be simply referred to as the circumferential direction, and the radial direction of an imaginary circle centered on the axial direction may be simply referred to as the radial direction. Furthermore, in this embodiment, when the socket 10 is held on 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 are interchangeable.

[0014] The socket 10 has a generally cylindrical socket body 11 extending along the axial direction, and a polygonal column-shaped head 12 disposed at one axial end (the end on the +Z side) of the socket body 11. The socket 10 contains 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 on one side (+Z side) of the socket body 11 in the axial direction, and the large diameter portion 11b is on the other side (-Z side) of the socket body 11 in the axial direction. In other words, the small diameter portion 11a is located 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 circumferentially 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 around the entire outer peripheral surface of the socket body 11. The first groove 14 is a round groove. In other words, the first groove 14 is recessed so as to curve 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 that extends circumferentially 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 second groove 15 is disposed on the outer peripheral surface of the socket body 11 on the opposite side from the head 12 relative 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 relative to the first groove 14 in the axial direction. In further words, the second groove 15 is disposed on the -Z side of the first groove 14. The second groove 15 is disposed in the large diameter portion 11b. The second groove 15 extends around the entire 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 this embodiment is an example of a first engagement portion according to the present invention.

[0019] The head 12 has a so-called insertion angle. The head 12 protrudes from one axial end (the end on the +Z side) of the socket body 11 to one axial side (the +Z side). The head 12 has a generally rectangular prism shape as a whole. In other words, the 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 that connects 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 while being 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 main body 20 transmits the power of the power source 23 to the socket 10. When the shaft 21 connected to the socket 10 by the connecting portion 40 rotates, 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 a Cartesian robot 24. The device body 20 is moved along three axes, the X direction, the Y direction, and the Z direction, by the Cartesian 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 around 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 has a cylindrical shape extending 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 around the rotation axis C as the shaft 21 rotates.

[0025] The holder 41 has a socket accommodating portion 45 for accommodating the socket 10. The socket accommodating portion 45 is a space defined by the inner circumferential surface of the cylindrical holder 41 and opens 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 has 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 has a so-called drive angle corresponding to the insertion angle of the socket 10. As shown in FIG. 3 , the first portion 46 has a polygonal shape when viewed in the axial direction. Specifically, the first portion 46 of this embodiment has a star-shaped polygonal shape when viewed in the axial direction. More specifically, the first portion 46 of this embodiment has a polygonal shape when viewed in the axial direction, consisting of three squares Sq1, Sq2, and Sq3 that are circumferentially offset by 30° from one another around the rotation axis C. When viewed in the axial direction, the three squares Sq1, Sq2, and Sq3 included in the first portion 46 are each slightly larger than the shape of the head 12 when viewed in the axial direction, allowing the head 12 to be inserted. When viewed in the axial direction, the angles of the twelve convex angles included in the first portion 46 are 90°. In other words, the first portion 46 of this embodiment is a so-called triple square. The first portion 46 of this embodiment is an example of a housing portion according to the present invention.

[0028] The second portion 47 has a circular shape when viewed in the axial direction and 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 radially defines the socket accommodating portion 45. The inner circumferential surface 48 has a first inner circumferential surface 48a that radially defines the first portion 46 and a second inner circumferential surface 48b that radially defines the second portion 47. 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 (-Z side) in the axial direction. The inner circumferential surface 48 also has a second inclined surface 48d that is disposed closer to the tip 41a (-Z side) than the second inner circumferential surface 48b and extends radially outwardly in the axial direction and slopes toward the tip 41a (-Z side).

[0030] As shown in Fig. 2, the holder 41 has two retaining holes 41c for holding the steel balls 42. The two retaining holes 41c are arranged at equal intervals in the circumferential direction. Each retaining hole 41c holds one steel ball 42. The retaining holes 41c penetrate the holder 41 in the radial direction, and communicate 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 of the holder 41 (-Z side) 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 movement of the sleeve 43 toward the -Z side. An inner circumferential groove 43a recessed radially outward from the inner circumferential 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 sliding properties. In other words, a plated film to improve sliding properties 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 balls 42 are pushed radially inward by the inner peripheral surface of the sleeve 43 and protrude into the holder 41. On the other hand, 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 balls 42 can retreat into the inner peripheral 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] 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 extension portions 32A and 32B extending parallel to each other from the base 31 toward the +Y side. In the following description, when there is no need to particularly distinguish between the two extension portions 32A and 32B, one of the two extension portions 32A and 32B may be simply referred to as extension portion 32.

[0036] The support base 30 includes protrusions 33 protruding from the inner surfaces of the base 31 and the extensions 32A and 32B. Specifically, the protrusions 33 protrude from the inner surfaces of the base 31 and the extensions 32A and 32B, which are connected in a U-shape as viewed along the axial direction. The protrusions 33 extend in a U-shape as viewed along the axial direction. The portion of the protrusion 33 located 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, curved convexly toward the -Y side as viewed along the axial direction. The portion of the protrusion 33 located on the extension 32A protrudes to the -X side from the -X side side surface of the extension 32A and extends in the Y direction. The portion of the protrusion 33 located on the extension 32B protrudes to the +X side from the +X side side surface of the extension 32B and extends in the Y direction. The protrusions 33 of this embodiment are 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 has a V-shape 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 holder 30 has a guide portion 34 arranged on an upper portion of the holder 30. The guide portion 34 is arranged on the +Z side of the upper surface 32a of the extending portion 32, and includes a first surface 34a extending in the X and Y directions that comes into contact with 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 includes a second surface 34b that is inclined downward from the first surface 34a side toward the upper surface 32a 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 includes a second surface 34b that is inclined toward the -Z side as it moves from the -Y side to the +Y side.

[0039] The second surface 34b of the guide portion 34 allows the sleeve 43 to move from the base end 41b toward the tip 41a due to the biasing force of the spring 44 when the socket 10 moves from the first position toward the second position, and moves the sleeve 43 from the tip 41a toward the base end 41b against the biasing force of the spring 44 when the socket 10 moves from the second position toward 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 socket 10 in the first position are removably attached to holder 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 protruding portion 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 protruding portion 33 in between.

[0044] 2, magnet 50 is placed in mounting hole 30a formed in holder 30. Magnet 50 has a stepped shape, and contact with a step protruding from the inner circumferential surface that defines mounting hole 30a prevents magnet 50 from falling out of mounting hole 30a. Magnet 50 is held in mounting hole 30a by set screw 51.

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

[0046] The operation of attaching and detaching the socket 10 to the device main body 20 will be described below with reference to FIGS. 1 and 2 and 5 to 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 along a cross section including the rotation axis C and extending in the X and Y directions. 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 along a cross section including the rotation axis C and extending in the X and Y directions.

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

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

[0049] Next, as shown in FIGS. 5 and 6 , the device body 20, which is arranged coaxially with the socket 10, is moved toward 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 toward the −Z side, the shaft 21 rotates about the rotation axis C. 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 retreat into the inner circumferential groove 43a of the sleeve 43.

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

[0051] 7 and 8, when the socket 10 moves to the second position, the sleeve 43 abuts against 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 be described.

[0053] With the device body 20 and socket 10 connected together, the socket 10 is moved horizontally from the second position to the first position, causing the sleeve 43 to move 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 balls 42 are able to retreat into the inner circumferential groove 43a of the sleeve 43, thereby releasing the connection between the device body 20 and the socket 10. Thereafter, the device body 20 is moved upward, and 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, guiding 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 housed in the first portion 46 of the socket housing 45 of the connecting part 40, the guide part 34 allows the sleeve 43 to move from the base end 41b to the tip end 41a due to the biasing force of the spring 44. As a result, as the socket 10 moves from the first position to the second position, the steel balls 42 protrude radially inward from the second inner circumferential surface 48b of the holder 41 and fit into the second groove 15 of the socket 10, thereby connecting the device body 20 and the socket 10. Furthermore, when the socket 10 moves from the second position toward the first position while the device body 20 and the socket 10 are coupled, the guide portion 34 moves the sleeve 43 from the distal end 41a toward the proximal end 41b against the biasing force of the spring 44. As a result, as the socket 10 moves from the second position toward the first position, the steel balls 42 are retracted radially outward from the second inner circumferential surface 48b of the holder 41, and the coupling 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. Furthermore, according to the fastening device 1 of this embodiment, the coupling portion 40 for attaching and detaching the device body 20 and the socket 10 is disposed in the device body 20, so there is no need 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, as it can prevent 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, a mutual 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 main body 20.

[0057] The magnet 50 of this 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] In this embodiment, the first portion 46 has a star-shaped polygonal shape, as viewed along the axial direction, in which a plurality of squares Sq1, Sq2, and Sq3 corresponding to the shape of the head 12 are arranged offset from one another in the circumferential direction around the rotation axis C. With this configuration, when inserting the head 12 of the socket 10 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, thereby allowing the head 12 to 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 than when 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 to couple the socket 10 and the device main body 20 can be reduced.

[0059] In this embodiment, a plating film is disposed on the surface of the sleeve 43 to improve sliding properties. This configuration reduces 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 toward the second position. Similarly, with the device body 20 and the socket 10 connected, the socket 10 can be easily moved from the second position toward the first position.

[0060] In this embodiment, a plating film is disposed on the surface of the guide portion 34 to improve sliding properties. This configuration reduces 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 toward the second position. Similarly, with the device body 20 and the socket 10 connected, the socket 10 can be easily moved from the second position toward the first position.

[0061] In this embodiment, the inner circumferential surface 48 of the holder 41 is disposed between the first inner circumferential surface 48a and the second inner circumferential surface 48b and includes a first inclined surface 48c that extends radially outwardly toward the tip 41a (-Z side) in the axial direction. With this configuration, the first inclined surface 48c comes into contact with the head 12 of the socket 10 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, guiding the socket 10 toward the radially inward direction 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, guiding the head 12 toward the first portion 46 of the socket accommodating portion 45. As a result, the head 12 of the socket 10 can be easily inserted into the first portion 46, and the time required to couple the socket 10 to the device body 20 can be shortened.

[0062] In this embodiment, the inner circumferential surface 48 of the holder 41 is disposed closer to the tip 41a (-Z side) than the second inner circumferential surface 48b and includes a second inclined surface 48d that extends radially outward in the axial direction toward the tip 41a (-Z side). With this configuration, the second inclined surface 48d comes into contact with the head 12 of the socket 10 when the holder 41 moves in the Z direction toward the head 12 of the socket 10, thereby guiding the socket 10 toward the radially inward direction 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, thereby guiding the head 12 toward the second portion 47 of the socket accommodating portion 45. As a result, the socket 10 can be easily inserted into the second portion 47, and the time required to couple the socket 10 to the device main body 20 can be shortened.

[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 has a substantially quadrangular prism shape, but the head 12 according to the present invention is not limited to this and may have 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 has 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 have 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 this is not limiting. 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 arranged on the inner surfaces of the base 31 and the extensions 32A and 32B, but this is not limitative and the protrusions 33 may be arranged only on the extensions 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 no magnets 50 may be attached to the holding base 30, or one magnet 50 may be 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 when viewed along the axial direction, in which a plurality of polygons corresponding to the shape of the head 12 are arranged circumferentially offset from one another around the rotation axis C. However, the present invention is not limited to this. 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 when viewed along the axial direction.

[0070] In the above embodiment, the nut accommodating recess 13 has a hexagonal shape when viewed in the axial direction, but is not limited to this. The nut accommodating recess 13 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 circumferentially 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 circumferentially offset from each other by 30° around the rotation axis C. In other words, the nut accommodating recess 13 may be a so-called double hexagonal shape. 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 limiting. 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 integrated structure, but is not limited to this. 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 polygonal head at one end of the axial direction when viewed along the axial direction; a device body having 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 able to protrude radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, that moves toward the tip end side of the holder to cause the spheres to protrude radially inward from the inner circumferential surface of the holder, and that moves toward the base end side of the holder to cause the spheres to retract radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, and 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 the opposite side of the head portion with respect to the outer circumferential groove in the axial direction and that 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 the sleeve to move 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 that 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 is provided, comprising:

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

[0076] [Aspect 3] the socket includes a magnetic material; The fastening device of any one of aspects 1 to 2 includes at least one magnet attached to the holder base for holding the socket in the first position.

[0077] [Aspect 4] Aspect 4 provides the fastening device of aspect 3, wherein the at least one magnet is detachably 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 multiple 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 part 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 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 Magnets 51 Set screw C Rotation axis

Claims

1. a socket extending in an axial direction and having a polygonal head at one end of the axial direction when viewed along the axial direction; a device body having 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 able to protrude radially inward from an inner circumferential surface of the holder; a sleeve that is movable relative to the holder in the axial direction, that moves toward the tip end side of the holder to cause the spheres to protrude radially inward from the inner circumferential surface of the holder, and that moves toward the base end side of the holder to cause the spheres to retract radially outward from the inner circumferential surface of the holder; a spring disposed between the holder and the sleeve, and 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 engaging portion that is disposed on the opposite side of the head portion with respect to the outer circumferential groove in the axial direction and that 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 the sleeve to move 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 that 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; Equipped with When viewed along the axial direction, the accommodation portion has a star-shaped polygonal shape in which a plurality of polygons corresponding to the shape of the head portion are arranged so as to be shifted from one another in the circumferential direction around the rotation axis, the inner circumferential surface of the holder has an inclined surface that extends radially inwardly toward the base end side in the axial direction and guides the head of the socket toward the accommodating portion, The fastening device, wherein the inclined surface is disposed between convex angles included in the star-shaped polygon when viewed along the axial direction.

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 engaging portion is a protrusion protruding from the holding base.

3. the socket includes a magnetic material; The fastening device of claim 1 , further comprising at least one magnet attached to the rest for holding 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.

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