JP2017159420A - Tool socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a configuration having a good economical efficiency in a tool socket having a socket body and a connection shaft.SOLUTION: A tool socket 2 comprises: a bottomed cylindrical socket body 21 having an open hole 24; a connection shaft 31 which is so configured as to be capable of being inserted in the open hole 24; and a ring member 41 which is so configured as to be elastically deformable in a radial direction, and is positioned between an external surface of the connection shaft and an internal surface of the open hole in the state that the other side of the connection shaft is inserted in the open hole. A socket body groove 24c is formed on the internal surface of the open hole 24. A connection shaft groove 32a is formed on the external surface of the connection shaft 31. The socket body groove 24c has a groove depth D1 which is equal to or more than a dimension of a radius of the ring member 41 in a radial direction cross section of the ring member 41. The connection shaft groove 32a has a groove depth D2 which is smaller than the dimension of the radius in said radial direction cross section.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tool socket having a connecting shaft connected to a rotary tool.

  Conventionally, a tool socket having a connecting shaft attached to an anvil of a rotary tool is known. For example, as disclosed in Patent Document 1, a work tool socket (tool socket) is obtained by fitting a mounting portion (connection shaft) provided on one end of a socket to a work tool mounting shaft (anvil). ) Is attached to the work tool (rotary tool).

JP 2001-105333 A

  By the way, in recent years, the number of high-voltage and high-power electric tools using a lithium ion battery as a power source has been increasing. Accordingly, in the configuration in which the connection shaft of the tool socket is fitted to the anvil as described above, there is a possibility that the connection shaft may be damaged if an excessive torque acts on the connection shaft.

  If the connecting shaft of the tool socket is damaged, it cannot be used as a tool socket. For this reason, even if the socket body is usable, the tool socket whose connection shaft is damaged is discarded. Therefore, each time the connecting shaft is broken, a new tool socket is required, which is not preferable from the viewpoint of economy.

  An object of the present invention is to realize an economical configuration in a tool socket having a socket body and a connecting shaft.

  The tool socket which concerns on one Embodiment of this invention is a socket for tools attached to a rotary tool. The tool socket is formed in a bottomed cylindrical shape extending in the cylinder axis direction, and has a socket body in which a through hole extending in the cylinder axis direction is formed in the bottom portion, and one side can be connected to the rotary tool. The connecting shaft is configured such that the other side can be inserted into the through hole, and is configured to be elastically deformable in the radial direction, and the other side of the connecting shaft is inserted into the through hole. And a ring member positioned between the outer surface of the connecting shaft and the inner surface of the through hole. A socket body groove capable of accommodating at least the radially outer peripheral side of the ring member is formed on the inner surface of the through hole. A connection shaft groove capable of accommodating the radially inner side of the ring member is formed on the outer surface of the connection shaft. The socket body groove has a groove depth that is half or more of the radial dimension of the ring member in the radial cross section of the ring member. The connection shaft groove has a groove depth smaller than half of the radial dimension in the radial section (first configuration).

  As described above, a ring member that is elastically deformable in the radial direction is disposed in the socket body groove formed on the inner surface of the through hole of the socket body and the connection shaft groove formed on the outer surface of the connection shaft. Thus, when the connection shaft is inserted into the through hole of the socket body, the ring member restricts relative movement of the socket body and the connection shaft in the cylinder axis direction. Thereby, the socket main body comprised by another member and a connection axis | shaft can be engaged.

  Moreover, the socket body groove has a groove depth that is more than half of the radial dimension of the ring member in the radial cross section of the ring member, and the connection shaft groove has a groove depth that is the radial direction of the ring member. Less than half of the dimension in cross section. Therefore, when a force of a predetermined value or more is applied to the connection shaft engaged with the socket body in the cylinder axis direction, the ring member is elastically deformed so as to expand radially outward, and the socket The whole ring member is accommodated in the connecting shaft groove by slipping out of the main body groove. Thereby, since the said connection axis | shaft becomes movable to the said cylinder axis direction with respect to the said socket main body, the said connection axis | shaft can be removed from the inside of the through-hole of the said socket main body.

  Therefore, when the connection shaft is broken, the connection shaft can be removed from the through hole of the socket body, and a new connection shaft can be inserted into the through hole of the socket body. Thereby, in the tool socket, when the connecting shaft is damaged, only the connecting shaft can be replaced. Therefore, the economical efficiency of the tool socket can be improved.

  In the first configuration, the radial cross section of the ring member is circular. The socket body groove has a groove depth equal to or larger than a radius dimension in the radial cross section. The connection shaft groove has a groove depth smaller than the radius dimension in the radial cross section (second configuration).

  Accordingly, when the ring member is engaged with the connection shaft groove, the ring member can be smoothly expanded in the radial direction by the connection shaft, and the ring member is caught in the opening portion of the connection shaft groove. The ring member can be smoothly engaged with the connecting shaft groove.

  Further, when the ring member is detached from the connecting shaft groove, the ring member can be smoothly expanded in the radial direction by the connecting shaft, and the ring member is not caught in the opening portion of the connecting shaft groove. The ring member can be smoothly detached from the connection shaft groove.

  Therefore, the connecting shaft can be smoothly attached to and detached from the socket body.

  In the first or second configuration, the connection shaft has a tapered portion that tapers toward the tip at the other end (third configuration). Thereby, when the other side of the connection shaft is inserted into the through hole of the socket body in a state where the ring member is disposed in the socket body groove of the socket body, the connection shaft is provided at the other end of the connection shaft. By the taper portion, the ring member can be smoothly expanded in the radial direction. Therefore, the ring member can be arranged more smoothly in the connecting shaft groove. Therefore, the connecting shaft can be more smoothly attached to the socket body.

  In any one of the first to third configurations, a hole diameter of a portion in which the socket body groove is formed on the inner surface of the through hole on the bottom surface side of the bottom portion with respect to the socket body groove. A step portion is formed so that the hole diameter on the bottom surface side becomes larger than that. The connection shaft has an enlarged diameter portion that is in contact with the stepped portion in a state where the connection shaft is inserted into the through hole and the ring member is disposed in the connection shaft groove (fourth configuration).

  Thereby, a ring member can be positioned in a connection shaft groove in the state which made the diameter-expansion part of the connection shaft contact the level | step-difference part of a socket main body. Therefore, the connecting shaft can be more reliably and easily positioned at the engagement position with the socket body in the cylinder axis direction of the socket body. Therefore, the connecting shaft and the socket body can be more reliably and easily engaged.

  The said 4th structure WHEREIN: The said enlarged diameter part is polygonal shape seeing from the said cylinder axis direction. The through-hole has a polygonal cross section that can be fitted to the enlarged diameter portion at a position corresponding to the enlarged diameter portion in a state where the connection shaft is inserted (fifth configuration).

  As a result, by inserting the connection shaft through the through hole of the socket body, the enlarged diameter portion of the connection shaft can be fitted into a part of the through hole, and the connection shaft and the socket body can be rotated integrally. become.

  According to the tool socket according to one embodiment of the present invention, the socket body and the connection shaft are configured by separate members, and the socket body groove provided on the inner surface of the through hole of the socket body has a groove depth. The connecting shaft groove provided on the outer peripheral surface of the connecting shaft is at least half the radial dimension of the ring member in the radial cross section of the ring member, and the groove depth is half of the radial dimension in the radial cross section. Smaller than.

  Accordingly, the socket body and the connection shaft can be easily attached and detached by causing elastic deformation of the ring members disposed in the socket body groove and the connection shaft groove. Therefore, it is possible to realize an economical tool socket configuration.

FIG. 1 is a side view showing a schematic configuration of an impact driver according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the tool socket is attached to the anvil. FIG. 3 is a cross-sectional view showing a schematic configuration of the tool socket. FIG. 4 is a cross-sectional view showing a schematic configuration of an engagement portion between the socket body and the connection shaft by the ring member. FIG. 5 is a cross-sectional view showing how the ring member expands in the radial direction when the connecting shaft is inserted through the socket body. FIG. 6 is a cross-sectional view illustrating a state in which the socket body and the connection shaft are engaged. FIG. 7 is a cross-sectional view showing a state when the connecting shaft is removed from the socket body.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the dimension of the structural member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each structural member, etc. faithfully.

  FIG. 1 is a side view showing a schematic configuration of an impact driver 1 according to an embodiment of the present invention. A tool socket 2 is attached to the impact driver 1. In the impact driver 1, although not particularly illustrated, by supplying electric power to a motor that is a drive source, the rotation shaft is rotated by the motor. The impact driver 1 has an anvil 10 to be described later that rotates according to the rotation of the rotary shaft and transmits the rotation to the tool socket 2. The specific configuration inside the impact driver 1 is the same as the configuration of the conventional impact driver, and thus detailed description thereof is omitted.

  In the following description, the left side in FIG. 1 is referred to as the front of the impact driver 1 (hereinafter simply referred to as the front), and the right side in FIG. 1 is referred to as the rear of the impact driver 1 (hereinafter also referred to simply as the rear).

  The anvil 10 is configured to be rotated by a rotating shaft (not shown) and to transmit the rotation to the tool socket 2. That is, as shown in FIG. 2, the anvil 10 is formed in a shaft shape in which the front side of the impact driver 1 extends in the axial direction of the rotation shaft, while the rear side of the impact driver 1 is in relation to the rotation shaft (not shown). The rotary shaft is connected to be rotatable.

  The anvil 10 is formed with a socket mounting hole 10a extending in the axial direction from the tip side to a predetermined position in a portion formed in an axial shape on the front side of the impact driver 1. When the anvil 10 is viewed from the axial direction, a connection shaft insertion hole 10b into which a connection shaft 31 (described later) of the tool socket 2 is inserted is formed at the bottom of the socket mounting hole 10a. That is, when the anvil 10 is viewed from the axial direction, the socket mounting hole 10a is larger in diameter than the connecting shaft insertion hole 10b (when the hole has a cross section other than a circle, it means the maximum width of the cross section). Is big.

  When the anvil 10 is viewed from the axial direction, the socket mounting hole 10a is formed in a circular shape, while the connecting shaft insertion hole 10b is formed in a hexagonal cross section. That is, the socket mounting hole 10 a is formed in a circular cross section corresponding to a cross sectional shape of a socket body 21 described later of the tool socket 2. Further, the connecting shaft insertion hole 10b is formed in a hexagonal cross section corresponding to the cross sectional shape of the connecting shaft 31 described later of the tool socket 2. By forming the connection shaft insertion hole 10b of the anvil 10 in such a shape, the connection shaft 31 of the tool socket 2 can be fitted into the connection shaft insertion hole 10b. Thereby, rotation of the anvil 10 can be transmitted to the socket body 21 via the connection shaft 31.

  In FIG. 2, a portion of the anvil 10 including the cylindrical side wall constituting the socket mounting hole 10a is a socket fitting portion 11, which is located on the rear side of the socket fitting portion 11 and connected to the connecting shaft insertion hole 10b. The portion provided with is the connecting shaft fitting portion 12.

  The socket fitting portion 11 has a plurality of through holes 11a (two in this embodiment, but may be three or more) arranged in a circumferential direction on a cylindrical side wall constituting the socket mounting hole 10a. Is formed. In each of these through holes 11a, metal ball members 13 are arranged. Each through hole 11 a is a round hole having a diameter larger than the diameter of the ball member 13. Thereby, the spherical member 13 arrange | positioned in each through-hole 11a can move to the radial direction of the socket fitting part 11. FIG. In addition, each through-hole 11a is located on the inner side of the socket fitting portion 11 so that the ball member 13 does not fall inward of the socket fitting portion 11 and only a part thereof is positioned in the socket mounting hole 10a. The diameter is smaller than the diameter of the spherical member 13. Moreover, in this embodiment, although the through-hole 11a is formed in the socket fitting part 11 in multiple numbers, it is not restricted to this, You may provide only one through-hole 11a.

  On the outer peripheral surface of the socket fitting portion 11, a chuck 15 is disposed. The chuck 15 is a cylindrical member and is disposed so as to cover the outer peripheral surface on the front side of the anvil 10. That is, the inner diameter of the chuck 15 is larger than the outer diameter of the front side (socket fitting portion 11) of the anvil 10.

  Projecting portions 15 a and 15 b projecting inward are formed on the inner peripheral surface of the chuck 15. These protrusions 15 a and 15 b are formed over the entire circumference of the inner peripheral surface of the chuck 15. The protrusion 15 a is provided at the end of the chuck 15 in the cylinder axis direction. The protrusion 15b is provided on the inner peripheral surface of the chuck 15 closer to the center in the cylinder axis direction than the protrusion 15a so as to form a recess 15c between the protrusion 15a and the protrusion 15a.

  The chuck 15 is disposed on the outer peripheral surface of the anvil 10 so as to be movable in the cylinder axis direction. The chuck 15 is urged to one side in the cylinder axis direction by a coiled compression spring 16. That is, the coiled compression spring 16 is disposed between the anvil 10 and the chuck 15 so that the axial direction thereof coincides with the axial direction of the anvil 10. The compression spring 16 has one end in contact with the protruding portion 15 b of the chuck 15 and the other end in contact with a ring member 17 fixed to the anvil 10. The compression spring 16 is positioned between the protruding portion 15 b of the chuck 15 and the ring member 17, and the protruding portion 15 b of the chuck 15 is positioned corresponding to the through hole 11 a of the socket fitting portion 11 of the anvil 10. It is configured to be.

  In this manner, the compression spring 16 disposed between the chuck 15 and the anvil 10 is configured such that the protruding portion 15b of the chuck 15 is positioned corresponding to the through hole 11a of the socket fitting portion 11 of the anvil 10. Thus, when the chuck 15 is moved to the front side of the anvil 10, a force for returning the chuck 15 to the original position is applied by the elastic restoring force generated in the compression spring 16. That is, in a state where no external force is applied to the chuck 15, the protruding portion 15 b of the chuck 15 is always positioned by the compression spring 16 corresponding to the through hole 11 a of the anvil 10.

  Accordingly, the protruding portion 15b of the chuck 15 contacts the ball member 13 disposed in the through hole 11a of the socket fitting portion 11 of the anvil 10 when no external force is applied to the chuck 15, while the chuck 15 is in contact with the anvil. When it moves to the front side of 10, it does not contact the ball member 13. When the chuck 15 moves to the front side of the anvil 10, the recess 15 c provided on the inner peripheral surface of the chuck 15 is positioned corresponding to the through hole 11 a of the anvil 10. At this time, since the ball member 13 in the through hole 11a can move into the recess 15c of the chuck 15, it can move radially outward from the inner surface of the socket fitting portion 11 of the anvil 10. .

  In this manner, the ball member 13 can be displaced in the radial direction of the socket fitting portion 11 by the chuck 15. As will be described later, the ball member 13 is provided in the socket body 21 of the tool socket 2 by displacing the ball member 13 in the radial direction of the socket fitting portion 11 (direction perpendicular to the cylinder axis direction of the anvil 10). The groove 23a can be engaged or disengaged. That is, the chuck 15 corresponds to an engagement switching unit that switches the ball member 13 between an engagement position and a non-engagement position with the groove 23a.

(Tool socket)
Next, the configuration of the tool socket 2 will be described with reference to FIGS.

  As shown in FIG. 3, the tool socket 2 includes a socket body 21, a connection shaft 31, and a ring member 41 that can be elastically deformed in the radial direction. The socket body 21 and the connection shaft 31 are separate members, and the tool socket 2 is configured by inserting the connection shaft 31 into a through-hole 24 described later of the socket body 21. The socket body 21 and the connection shaft 31 are restricted from moving in the cylinder axis direction, which will be described later, by a ring member 41 disposed in the through hole 24 of the socket body 21.

  The ring member 41 is made of a metal wire having a circular cross section, and the wire is curved in a C shape. That is, the ring member 41 is formed in a substantially circular shape and has free ends that are not connected to each other at both ends. Thereby, the ring member 41 is configured to be elastically deformable in the radial direction.

  The connecting shaft 31 is formed in a column shape extending in the axial direction. One end of the connection shaft 31 is exposed from the socket body 21, and the other side is inserted into a through-hole 24 described later provided in the socket body 21. The connecting shaft 31 has a circular cylindrical section 32 formed at the other end, and a hexagonal column section 33 (expanded diameter section) formed in a hexagonal cross section. The hexagonal column part 33 has a dimension in a direction perpendicular to the axis (hereinafter simply referred to as a radial dimension) larger than a radial dimension of the cylindrical part 32. The other side of the cylindrical portion 32 and the hexagonal column portion 33 of the connecting shaft 31 is inserted into the through hole 24 of the socket body 21. One side of the connection shaft 31, that is, the one side of the hexagonal column 33 is inserted into the connection shaft insertion hole 10 b of the anvil 10.

  As shown in FIG. 4, a connecting shaft groove 32 a having a rectangular cross section extending in the circumferential direction is formed on the outer peripheral surface of the cylindrical portion 32. The connecting shaft groove 32a has a groove depth D1 that is smaller than the radius of the radial cross section of the ring member 41 (half of the radial dimension), and is half the radial direction of the ring member 31 in the radial cross section of the ring member 41. The groove width W1 can accommodate a smaller portion. In this embodiment, as shown in FIG. 4, the groove width W1 of the connecting shaft groove 32a is larger than the diameter of the radial cross section of the ring member 41. However, the present invention is not limited to this, and the radial cross section of the ring member 41 As long as the groove width can accommodate a portion smaller than half of the ring member 31 in the radial direction, it may be smaller than the diameter.

  The cylindrical portion 32 is provided with a tapered portion 32b that tapers toward the tip of the connecting shaft 31 at the other end of the connecting shaft groove 32a. Thereby, when the connecting shaft 31 is inserted into the through hole 24 of the socket body 21 as described later, the ring member 41 disposed in the through hole 24 can be easily expanded in the radial direction.

  As shown in FIG. 3, the socket body 21 is formed in a bottomed cylindrical shape that extends in the cylinder axis direction as a whole, and the inner peripheral surface thereof is formed with irregularities in accordance with the cross-sectional shapes of the bolts and nuts. . That is, the socket main body 21 has a cylindrical side wall portion 22 that forms a space in which a fastening member such as a bolt or a nut can be stored, and a columnar bottom portion 23.

  The bottom part 23 has a smaller outer diameter than the side wall part 22 and is formed in a columnar shape extending in the cylinder axis direction. That is, the bottom part 23 is formed so as to protrude toward one side in the cylinder axis direction while forming a bottom part with respect to the side wall part 22.

  The bottom portion 23 is provided with a through hole 24 penetrating in the cylinder axis direction. The through hole 24 is configured to be able to be fitted to the connection shaft 31. That is, the bottom portion 23 is formed with a circular hole portion 24a into which the cylindrical portion 32 of the connection shaft 31 can be fitted, and a hexagonal hole portion 24b into which the hexagonal column portion 33 of the connection shaft 31 can be fitted. The through hole 24 is constituted by the circular hole portion 24a and the hexagonal hole portion 24b. The circular hole portion 24 a is provided on the side wall portion 22 side of the bottom portion 23. The hexagonal hole 24b is provided closer to the bottom surface of the bottom 23 than the circular hole 24a. By fitting the hexagonal column portion 33 of the connection shaft 31 into the hexagonal hole portion 24 b of the socket main body 21, the socket main body 21 and the connection shaft 31 can be integrally rotated in the rotation direction of the anvil 10.

  As shown in FIG. 4, a socket body groove 24c extending in the circumferential direction is formed on the inner surface of the circular hole 24a. In the socket body groove 24c, at least the radially outer peripheral portion of the ring member 41 is accommodated. The socket body groove 24 c has a groove width W <b> 2 larger than the diameter of the ring member 41 in the radial cross section of the ring member 41. Further, the socket body groove 24c has a groove depth D2 equal to or larger than the radius of the ring member 41 in the radial section of the ring member 41 (half of the radial dimension).

  By configuring the socket body groove 24c as described above, the ring member 41 disposed in the socket body groove 24c can be elastically deformed so as to expand in the radial direction. Therefore, as shown in FIG. 5, when the connecting shaft 31 is inserted into the through hole 24, the ring member 41 has a radial direction due to the tapered portion 32 b provided on the other side of the cylindrical portion 32 of the connecting shaft 31. Elastic deformation occurs so as to spread. Thereafter, as shown in FIG. 6, when the connecting shaft 31 is inserted into the through hole 24 until the connecting shaft groove 32 a of the cylindrical portion 32 faces the ring member 41, the ring member 41 is contracted in the radial direction. By deformation, the radially inner side of the ring member 41 is positioned in the connecting shaft groove 32a.

  As described above, the connection shaft groove 32 a of the connection shaft 31 has a groove depth D <b> 1 that is smaller than the radius of the ring member 41 in the radial cross section of the ring member 41. Therefore, the ring member 41 is positioned in the socket main body groove 24 c of the socket main body 21 in the state where the radially inner side is positioned in the connection shaft groove 32 a. As a result, the ring member 41 is positioned in the socket body groove 24c of the socket body 21 and in the connection shaft groove 32a of the connection shaft 31, so that the relative movement of the socket body 21 and the connection shaft 31 in the cylinder axis direction is restricted. Is done.

  Further, since the connecting shaft groove 32a of the connecting shaft 31 has the groove depth D1 as described above, the side wall of the socket main body 21 with respect to the connecting shaft 31 engaged with the socket main body 21, as shown in FIG. When a force of a predetermined value or more is applied from the side of the portion 22 in the cylinder axis direction, the ring member 41 expands in the radial direction by the force applied from the side surface of the connection shaft groove 32a. In this state, when the connection shaft 31 is further moved in the cylinder axis direction with respect to the socket body 21, the ring member 41 comes out of the connection shaft groove 32a. Thereby, the connecting shaft 31 can move in the cylinder axis direction with respect to the socket body 21, and the connecting shaft 31 can be detached from the socket body 21.

  As shown in FIGS. 3 to 7, the hexagonal hole 24b has a maximum hole diameter larger than that of the circular hole 24a. As a result, a step 24d is formed in the through hole 24 between the hexagonal hole 24b and the circular hole 24a. The stepped portion 24d is a cylinder of the connecting shaft 31 in a state where the connecting shaft 31 is inserted into the through hole 24 and the radially inner peripheral side of the ring member 41 is positioned in a connecting shaft groove 32a described later of the connecting shaft 31. A boundary portion between the portion 32 and the hexagonal column portion 33 (the end portion on the other side of the hexagonal column portion 33) is formed at a position to be positioned.

  Therefore, when the connection shaft 31 is inserted into the through hole 24, the cylinder axis direction of the connection shaft 31 is positioned at a position where the ring member 41 is positioned in the socket body groove 24c and the connection shaft groove 32a. Thereby, the ring member 41 can be reliably positioned in the socket body groove 24c and the connecting shaft groove 32a. Therefore, the relative movement of the socket body 21 and the connection shaft 31 in the cylinder axis direction can be more reliably regulated.

  As shown in FIG. 3, a groove 23 a having a semicircular cross section is formed on the outer peripheral surface of the bottom portion 23 at one end portion over the entire circumference of the bottom portion 23. The cross section of the groove 23a has a radius of curvature larger than the diameter of the ball member 13 so that the ball member 13 disposed in the socket fitting portion 11 of the anvil 10 can be engaged. As shown in FIG. 2, the groove 23 a contacts the ball member 13 with the bottom 23 of the tool socket 2 out of the outer peripheral surface of the bottom 23 inserted into the socket mounting hole 10 a of the anvil 10. In the position.

  A groove 23b for disposing the spring steel 18 is formed in the central portion of the bottom 23 in the axial direction. The spring steel 18 is a C-shaped member in which a part of a ring-shaped member is cut out. The spring steel 18 is attached so as to be expanded in the radial direction in the groove 23b. Further, the spring steel 18 has a greater radial thickness than the groove depth of the groove 23b.

  By disposing the spring steel 18 having the above-described configuration in the groove 23b of the bottom portion 23, the spring steel 18 is disposed radially outward from the outer peripheral surface of the bottom portion 23 in a state of being disposed in the groove 23b. Protruding. As a result, the spring steel 18 comes into contact with the inner surface of the socket fitting portion 11 of the anvil 10 with the tool socket 2 attached to the anvil 10. Can be eliminated.

(Removal of connecting shaft)
Next, a method for attaching and detaching the connection shaft 31 to the socket body 21 in the tool socket 2 having the above-described configuration will be described with reference to FIGS.

  As shown in FIG. 5, when the connection shaft 31 is inserted into the through hole 24 of the socket body 21 (the white arrow in the figure), the cylindrical portion 32 of the connection shaft 31 is fitted into the circular hole 24 a of the socket body 21. At the same time, the hexagonal column 33 is fitted into the hexagonal hole 24 b of the socket body 21.

  When the connecting shaft 31 is further inserted into the through hole 24 of the socket body 21, the ring member 41 disposed in the socket body groove 24 c of the socket body 21 is expanded in the radial direction by the cylindrical portion 32 of the connecting shaft 31. Deforms (black arrow in the figure). Since the groove depth D2 of the socket body groove 24c in which the ring member 41 is accommodated is not less than the radius of the radial cross section of the ring member 41, the ring member 41 can be deformed as described above.

  When the connecting shaft groove 32a of the connecting shaft 31 moves to the position of the ring member 41, as shown in FIG. 6, the ring member 41 is deformed so as to shrink in the radial direction (black arrow in the figure) and radially inward. One side is accommodated in the connecting shaft groove 32a.

  Accordingly, the ring member 41 restricts relative movement of the socket body 21 and the connection shaft 31 in the cylinder axis direction. Moreover, since the hexagonal column portion 33 of the connection shaft 31 is fitted in the hexagonal hole portion 24 b of the socket body 21, the rotation of the anvil 10 can be transmitted to the socket body 21 via the connection shaft 31. Therefore, the socket main body 21 and the connecting shaft 31 can be integrated, and the tool socket 2 obtained thereby can be rotated by the rotary tool 1.

  On the other hand, the ring member 41 disposed in the socket body groove 24 c of the socket body 21 is also located in the connection shaft groove 32 a of the connection shaft 31, that is, the socket body 21 and the connection shaft 31 are moved by the ring member 41. In a state where relative movement in the cylinder axis direction is restricted, as shown in FIG. 7, a force is applied to the connection shaft 31 from the side wall portion 22 side of the socket body 21 (white arrow in the figure) to connect The ring member 41 located in the connecting shaft groove 32a of the shaft 31 receives a force that expands in the radial direction by the side wall of the connecting shaft groove 32a. At this time, since the groove depth D1 of the connecting shaft groove 32a is smaller than the radius of the ring member 41 in the radial cross section of the ring member 41, the ring member 41 expands in the radial direction so as to come out of the connecting shaft groove 32a ( Black arrow in the figure).

  When the ring member 41 expands in the radial direction and is positioned in the socket main body groove 24c of the socket main body 21, the ring member 41 is detached from the connection shaft groove 32a. Can be moved to. Thereby, the connection shaft 31 can be taken out from the ring member 41 and replaced.

  As described above, in the tool socket 2 according to this embodiment, the socket body groove 24 c provided on the inner surface of the through hole 24 of the socket body 21 and the connection shaft groove 32 a provided on the outer peripheral surface of the connection shaft 31 are connected to the ring. A member 41 is arranged. Thereby, the relative movement of the socket body 21 and the connection shaft 31 in the cylinder axis direction is restricted by the ring member 41. Further, by inserting the connecting shaft 31 into the through hole 24 of the socket body 21, the hexagonal column portion 33 of the connecting shaft 31 is fitted into the hexagonal hole portion 24 b of the socket body 21. Thereby, the rotation of the anvil 10 can be transmitted to the socket body 21 via the connection shaft 31.

  The connecting shaft groove 32 a provided on the outer surface of the connecting shaft 31 is provided on the inner surface of the through hole 24 of the socket body 21 while the groove depth D 1 is smaller than the radial dimension of the radial cross section of the ring member 41. The socket body groove 24c has a groove depth D2 equal to or greater than the radial dimension of the radial cross section of the ring member 41.

  Thereby, the connection axis | shaft 31 can be easily attached or detached with respect to the socket main body 21 as mentioned above. Therefore, even when an excessive force is applied to the connecting shaft 31 and the connecting shaft 31 is damaged, the connecting shaft 31 can be easily replaced.

  Further, the connecting shaft 31 has a cylindrical portion 32 and a hexagonal column portion 33 having a larger radial dimension than the cylindrical portion 32, and the socket body 21 has a circular hole portion 24 a and a hexagonal column portion corresponding to the cylindrical portion 32. A hexagonal hole portion 24b is formed corresponding to 33, and a step portion 24d is formed between the circular hole portion 24a and the hexagonal hole portion 24b.

  Moreover, in a state where the connection shaft 31 is inserted into the through hole 24 of the socket body 21, the connection shaft groove 32a of the connection shaft 31 is positioned corresponding to the ring member 41 disposed in the socket body groove 24c. The step portion 24d is provided in the socket body 21. Similarly, the cylindrical portion 32 and the hexagonal column portion 33 of the connecting shaft 31 are also positioned so that the connecting shaft groove 32a provided in the cylindrical portion 32 corresponds to the ring member 41 disposed in the socket body groove 24c. A connecting shaft 31 is provided.

  Thereby, in a state where the connection shaft 31 is inserted into the through hole 24 of the socket body 21, the end of the connection shaft 31 on the columnar portion 32 side of the hexagonal column 33 is a step in the through hole 24 of the socket body 21. The contact shaft groove 32 a provided in the cylindrical portion 32 is positioned corresponding to the ring member 41 disposed in the socket body groove 24 c of the socket body 21 while contacting the portion 24 d. Therefore, the ring member 41 disposed in the socket body groove 24c of the socket body 21 can be more reliably and easily engaged with the connection shaft groove 32a of the connection shaft 31.

  In addition, by making the radial cross section of the ring member 41 circular, the ring member 41 can be easily expanded in the radial direction by the connection shaft 31 when the connection shaft 31 is inserted into the through hole 24 of the socket body 21. In addition, the ring member 41 can be smoothly arranged in the connection shaft groove 32a without being caught by the opening portion of the connection shaft groove 32a. On the other hand, when the connecting shaft 31 is pulled out from the through hole 24 of the socket body 21, the ring member 41 can be smoothly detached from the connecting shaft groove 32a.

  Therefore, the connecting shaft 31 can be smoothly attached to and detached from the socket body 21.

  Furthermore, the connecting shaft 31 has a tapered portion 32b that tapers toward the tip at the other end. Thus, when the other side of the connection shaft 31 is inserted into the through hole 24 of the socket body 21 with the ring member 41 being disposed in the socket body groove 24 c of the socket body 21, The ring member 41 can be smoothly expanded in the radial direction by the tapered portion 32b provided at the end. Therefore, the ring member 41 can be arranged more smoothly in the connection shaft groove 32a. Therefore, the connection shaft 31 can be attached to the socket body 21 more smoothly.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In the embodiment, the ring member 41 has a circular cross section in the radial direction. However, the radial cross-section of the ring member 41 may be any cross-sectional shape that is the surface of the ring member 41 in which the connection shaft groove 32a of the connection shaft 31 is detachable with respect to the ring member 41, such as an ellipse It may be a shape.

  When the radial cross section of the ring member 41 is not circular, the groove depth of the connection shaft groove 32a of the connection shaft 31 is smaller than half of the radial dimension in the radial cross section of the ring member 41, and the socket The groove depth of the socket body groove 24 c of the main body 21 is at least half of the radial dimension in the radial cross section of the ring member 41.

  In the embodiment, the connection shaft 31 includes the cylindrical portion 32 and the hexagonal column portion 33. However, the connecting shaft 31 may be configured only by a hexagonal column portion, and is not limited to a hexagonal cross section, and may have any shape as long as it is a polygonal shape. In this case, a part of the through hole 24 of the socket body 21 may be a through hole having a cross-sectional shape corresponding to the polygonal cross section of the connecting shaft.

  In the embodiment, the step portion 24 d is provided in the through hole 24 of the socket body 21, and the connection shaft 31 includes the columnar portion 32 and the hexagonal column portion 33 having different radial dimensions. However, a step may not be provided in the through hole 24 of the socket body 21, and the radial dimension of the cylindrical portion and the hexagonal column portion of the connection shaft 31 may be the same.

  In the embodiment, the tool socket 2 is configured such that the ball member 13 disposed in the through hole 11 a of the anvil 10 is engaged with the groove 23 a provided on the surface of the bottom 23 of the socket body 21. It is fixed to. However, the fixing structure between the tool socket 2 and the anvil 10 is not limited to the above-described configuration, and may be any configuration.

  The present invention can be used for a tool socket having a socket body and a connecting shaft.

1 Impact driver (rotary tool)
2 Tool socket 21 Socket body 22 Side wall 23 Bottom 23a Groove 23b Groove 24 Through hole 24a Circular hole 24b Hexagonal hole 24c Socket body groove 24d Stepped portion 31 Connection shaft portion 32 Column portion 32a Connection shaft groove 32b Taper portion 33 Hexagonal column (expanded part)
41 Ring members D1, D2 Groove depth W1, W2 Groove width

Claims (5)

A tool socket to be attached to a rotating tool,
A socket main body formed in a bottomed cylindrical shape extending in the cylinder axis direction, and having a through hole extending in the cylinder axis direction at the bottom,
A connecting shaft configured such that one side can be connected to the rotary tool and the other side can be inserted into the through hole;
A ring member configured to be elastically deformable in a radial direction and positioned between an outer surface of the connection shaft and an inner surface of the through hole in a state where the other side of the connection shaft is inserted into the through hole And
On the inner surface of the through hole, a socket body groove capable of accommodating the radially outer peripheral side of the ring member is formed,
On the outer surface of the connection shaft, a connection shaft groove capable of accommodating the radially inner side of the ring member is formed,
The socket body groove has a groove depth that is at least half of the radial dimension of the ring member in the radial section of the ring member;
The connecting shaft groove has a groove depth smaller than half of the radial dimension in the radial section. The tool socket according to claim 1,
The radial cross section of the ring member is circular,
The socket body groove has a groove depth equal to or greater than a radius dimension in the radial cross section,
The connecting shaft groove has a groove depth smaller than the radial dimension in the radial cross section. The tool socket according to claim 1 or 2,
The connection shaft has a taper portion that tapers at an end portion on the other side toward the tip end. The tool socket according to any one of claims 1 to 3,
On the inner surface of the through hole, a step portion is formed on the bottom surface side of the bottom portion with respect to the socket body groove so that the hole diameter on the bottom surface side is larger than the hole diameter of the portion where the socket body groove is formed. And
The connection shaft has a diameter-enlarged portion that contacts the stepped portion in a state where the connection shaft is inserted into the through hole and the ring member is disposed in the connection shaft groove. The tool socket according to claim 4,
The diameter-expanded portion is polygonal when viewed from the cylinder axis direction,
The through hole is a tool socket having a polygonal cross section that can be fitted to the enlarged diameter portion at a position corresponding to the enlarged diameter portion in a state where the connection shaft is inserted.

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