JP2019115965A - Tip tool - Google Patents

Abstract

To provide a tip tool which is constituted so as to insert a shaft body from a fitting port side of a socket and suppresses that an axial center of the socket is deviated from an axial center of the shaft body.SOLUTION: A tip tool 1 includes a cylindrical socket 2 and a shaft body 4 connected to the socket 2 by press fitting. Therein, a part 31 to be press-fitted to which the shaft body 4 is press-fitted and a fitting port 33 which is fitted to a rotary tool or a component rotated by the rotary tool are formed in the cylinder of the socket 2, the shaft body 4 is inserted to the socket 2 from the fitting port 33 side, a connection part 42 of the shaft body 4 is constituted so as to be press-fitted and fixed to the part 31 to be press-fitted and a guide part 32 having a diameter smaller than that of the part 31 to be press-fitted which guides the shaft body 4 along a shaft center direction of the socket 2 when the shaft body 4 is inserted to the socket 2 is provided on the side opposite to the fitting port 33 with respect to the part 31 to be press-fitted in the cylinder of the socket 2.SELECTED DRAWING: Figure 5

Description

  The present invention belongs to the technical field related to a tip tool attached to a rotary tool.

  Heretofore, a tip tool mounted on a rotary tool is known.

  Patent Document 1 discloses a connection that connects a connection shaft portion (shaft body) that can be connected to a rotary tool, a socket portion that has a receiving port that can be fitted to a nut, and the proximal end side of the socket portion and the connection shaft portion. The tip tool which has a member, a connecting member is constituted by a metallic cylinder, and a stopper ring for fall prevention is provided in the perimeter of a connecting shaft inside the connecting member is disclosed.

  Patent Document 2 includes a rotary tool mounting shaft (shaft) to be mounted on a rotary tool, and a socket having a fitting opening such as a nut, and a connecting portion to the socket in the rotary tool mounting shaft, A tip tool having a circumferential groove formed in a joint is disclosed. In Patent Document 2, the rotary tool mounting shaft portion is press-fit into the socket portion from the side opposite to the fitting opening in the socket portion.

JP 2012-143855 A JP-A-6-226651

  By the way, in the tip tool as described in Patent Documents 1 and 2, the shaft body is provided with a coupling portion coupled to the socket portion and a shaft portion thinner than the coupling portion, while the socket portion is provided with a rotating tool or fastening A fitting opening for fitting the component and a press-fit portion to which the coupling portion is press-fitted and fixed are provided. And at the time of manufacture of a front-end tool, as generally described in patent document 2, a shaft body is pressed in from the opposite side to the fitting opening of a socket part.

  As described in Patent Document 1, when the shaft body is configured as a portion attached to the rotary tool and the socket portion is configured as a portion acting on a fastening part or the like, the fitting opening of the socket portion is engaged with the fastening part or the like Configured to When manufacturing such a tip tool, the shaft body is press-fit from the end on the side opposite to the socket portion of the shaft portion. At this time, the shaft may be bent.

  On the other hand, there are also cases where the socket portion is a portion attached to the rotary tool, and the shaft body is a portion acting on a fastening part or the like. In this case, an action portion (a portion acting on a fastening member or the like) is formed at an end of the shaft opposite to the socket portion, and the fitting opening of the socket portion is configured to be fitted to the rotary tool. When manufacturing such a tip tool, the punch of the press and the action portion are brought into contact with each other, and a force is input from the action portion. For this reason, a load is directly applied to the action part, and the action part may be deformed.

  As described above, as a method for suppressing the deformation of the shaft body when the shaft body is pressed into the socket portion, the shaft body is inserted from the fitting opening side of the socket portion, and the coupling portion of the shaft body is A method of press-fitting and fixing to a press-fit portion is conceivable. In this way, when inserting the shaft into the socket, the end in the insertion direction of the shaft is floated so that the shaft can be moved toward the side opposite to the fitting opening with press-fitting. Ru. For this reason, there is a possibility that the axial center of the socket portion and the axial center of the axial body may be deviated by the axial movement at the time of press-fitting.

  This invention is made in view of such a point, and the place made into the objective aims at the fitting opening which the axial body is pressed in, and the fitting opening fitted to the components rotated by a rotating tool or a rotating tool. SUMMARY OF THE INVENTION An object of the present invention is to suppress deviation between the axial center of the socket and the axial center of the shaft in a tip tool configured by inserting the shaft from the fitting opening side of the socket with respect to the socket in which.

In order to solve the above problems, the present invention is directed to a tip tool attached to a rotary tool,
A cylindrical socket and a shaft coupled to the socket by press-fitting, and the press-fit portion into which the shaft is press-fitted into the barrel of the socket, and the rotating tool or the rotating tool And the shaft has a shaft and a joint provided at one end of the shaft and coupled to the socket, the shaft being the socket And the coupling portion is press-fitted and fixed to the press-fit portion, and is formed on the side opposite to the fitting opening with respect to the press-fit portion in the cylinder of the socket. A guide portion is provided, which guides the shaft along the axial direction of the socket when the shaft is inserted into the socket, and is provided with a guide portion smaller in diameter than the press-fit portion. .

  According to this configuration, since the shaft is inserted into the socket from the fitting opening side, when the coupling portion of the shaft is pressed into the press-fit portion of the socket, the end in the insertion direction of the shaft is in a floating state Ru. For this reason, at the time of press-fitting, the shaft may be shaken, and the shaft center of the socket and the shaft center of the shaft may be displaced. On the other hand, in the present invention, since the guide portion having a diameter smaller than that of the pressed-in portion is provided, it is possible to suppress the deviation between the axial center of the socket and the axial center of the shaft. Specifically, since the guide portion has a diameter smaller than that of the press-fit portion, even if the shaft tries to move in the radial direction of the socket, the shaft portion abuts on the guide portion to suppress the radial movement. Thus, when the shaft body is inserted into the socket, the shaft body is guided by the guide portion along the axial direction of the socket. As a result, it is possible to suppress the deviation between the axial center of the socket and the axial center of the shaft.

  In one embodiment of the tip tool, the vicinity of the coupling portion in the shaft portion of the shaft body is an overlapping portion that overlaps in a radial direction with a portion of the press-fit portion and the guide portion; A gap between the inner circumferential surface of the press-fit portion and the inner circumferential surface of the guide portion in the radial direction, and the gap between the inner circumferential surface of the press-fit portion and the overlapping portion A shock absorbing member is provided for suppressing relative shake between the socket and the shaft.

  That is, the guide portion is usually formed to be slightly larger in diameter than the shaft portion so that the shaft body can be inserted into the socket smoothly. Therefore, the overlapping portion of the shaft portion is positioned with a gap in the radial direction with respect to the inner peripheral surface of the guide portion. Although the guide portion can suppress the misalignment between the axial center of the socket and the axial center of the shaft body, the gap between the axial portion and the inner circumferential surface of the guide portion allows the socket to be used during actual work with the tip tool There is a possibility that relative movement between the shaft and the shaft may occur. At the time of actual work, the coaxiality between the axial center of the socket and the axial center of the axial body is required rather than the time of inserting the axial body into the socket.

  Therefore, in the present invention, a relative displacement between the socket and the shaft body is suppressed by arranging the buffer member in the gap between the inner peripheral surface of the pressed-in portion and the overlapping portion. Specifically, for example, the shaft is provided with an action portion acting on a component rotated by the rotating tool, and when the socket is mounted on the rotating tool, the shaft is in a radial direction independent of the socket. Shaking is likely to occur. When radial deflection of the shaft occurs, the shaft portion is displaced in the radial direction, and a force associated with the deflection is input from the shaft portion to the buffer member. The buffer member generates a repulsive force against the force input from the shaft and pushes the shaft back by the repulsive force. Thereby, the shake of the shaft can be suppressed.

  Also, conversely, when the working part is provided in the socket and the shaft body is mounted on the above-mentioned rotating tool, the socket is likely to be displaced in the radial direction independent of the shaft body. Even in this case, when the socket is displaced in the radial direction, the force accompanying the shake is input from the socket to the buffer member. The buffer member pushes back the socket with a repulsive force against the force input from the socket. Thereby, the shake of the socket can be suppressed. Therefore, even during actual work, it is possible to suppress the deviation between the axial center of the socket and the axial center of the shaft.

  In the tip tool, preferably, the buffer member is a peeling member which is peeled from an inner peripheral surface of the press-fit portion when the shaft is press-fit into the socket.

  According to this configuration, the peeling member is formed when the shaft body is pressed into the socket, and is formed in the vicinity of the coupling portion in the gap between the pressed-in portion and the shaft portion. Thereby, for example, when a shake occurs in the shaft body in the radial direction independent of the socket as described above, the shake of the shaft can be suppressed at a position serving as a base point of the shake of the shaft. As a result, it is possible to more effectively suppress the deviation between the axial center of the socket and the axial center of the shaft during actual operation.

  Further, since the peeling member is formed while being pushed out to the coupling portion, the peeling member is not tightly clogged in the gap between the inner circumferential surface and the overlapping portion of the pressed-in portion. For this reason, the peeling member can be appropriately elastically deformed when the force accompanying the shake is input from the shaft portion. Thereby, the said blurring can be suppressed, receiving the said blurring of the axial part appropriately.

  Furthermore, it is not necessary to form the buffer member as a separate member, and the number of parts can be reduced.

  As described above, according to the tip tool of the present invention, a guide portion smaller in diameter than the press-fit portion is provided on the opposite side of the press-fit portion to the press-fit portion in the cylinder of the socket. When the shaft body is inserted into the socket, the shaft body is guided along the axial center direction of the socket, so that it is possible to suppress deviation between the axial center of the socket and the axial center of the shaft body.

It is a half section view showing the tip tool concerning the embodiment of the present invention. It is the rear view which looked at the tip tool from the socket side. FIG. 7 is a cross-sectional view showing a state before press-fitting the coupling portion of the shaft body into the press-fit portion of the socket while manufacturing the tip tool. FIG. 4 is a cross-sectional view showing a state in which the coupling portion of the shaft is press-fit into the press-fit portion of the socket from the state of FIG. 3. It is the fragmentary sectional view which expanded the periphery of the connection part of the socket and shaft in a tip tool. FIG. 7 is a half sectional view showing a tip tool according to a second embodiment.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

  FIG. 1 shows a tip tool 1 according to the present embodiment. The tip tool 1 is a tool mounted on a rotary tool. The rotary tool includes manual and electric tools, such as a ratchet handle and an impact wrench.

  The end tool 1 includes a cylindrical socket 2 and a long shaft 4 coupled to the socket 2 by press fitting. As shown in FIG. 1, the shaft 4 extends from one end in the axial direction of the socket 2 toward one side in the axial direction.

  In the present embodiment, the socket 2 is configured as a portion to be attached to the rotating tool. The socket 2 is formed in a cylindrical shape as shown in FIG. Specifically, the socket 2 is contracted while extending from one end in the axial center direction of the first cylindrical portion 21 having a relatively large outer diameter and the first cylindrical portion 21 toward one side in the axial center direction. A diameter portion 22 and a second cylindrical portion 23 extending from the one end in the axial center direction of the reduced diameter portion 22 toward the one side are provided. The first cylindrical portion 21, the reduced diameter portion 22 and the second cylindrical portion 23 are coaxial. Two grooves 21 a are formed on the outer periphery of the first cylindrical portion 21. The two groove portions 21 a are groove portions for making it easy to hook a finger or a removal tool when removing the tip tool 1 from the rotary tool. The socket 2 is made of metal.

  In the cylinder of the socket 2, a press-fit portion 31 into which the shaft body 4 is press-fitted and a fitting opening 33 to be fitted with the rotary tool are formed. The fitting opening 33 is formed in the first cylindrical portion 31 as shown in FIG. The pressed-in portion 31 extends from one end of the fitting opening 33 in the axial direction, and a portion of the first cylindrical portion 21 at one side in the axial direction of the socket 2, the diameter-reduced portion 32, and the guide portion 32. It is formed over the portion on the other side in the axial direction. In the fitting opening 33, a plurality of engagement holes 33a that engage with the chuck of the rotary tool are formed side by side in the circumferential direction. When the fitting opening 33 is fitted to the rotary tool, the chuck of the rotary tool engages with the engagement hole 33a, whereby the tip tool 1 is locked so as not to fall off the rotary tool.

  In the cylinder of the socket 2, a guide portion 32 smaller in diameter than the press-fit portion 31 is provided on the opposite side of the press-fit portion 31 to the press-fit portion 31. The guide portion 32 extends from one end of the press-fit portion 31 in the axial direction and is formed in the second cylindrical portion 23. Although described later in detail, when the shaft 4 is inserted into the socket 2, the guide portion 32 guides the shaft 4 along the axial direction.

  As shown in FIG. 2, the diameter of the pressed-in portion 31 is shorter than the diagonal distance between coupling portions 42 of the shaft body 4 described later and longer than the facing distance. Moreover, the diameter of the press-fit part 31 is larger than the diameter of the axial part 41 which the axial body 4 mentions later. The diameter of the guide portion 32 is slightly larger than the diameter of the shaft portion 41 of the shaft 4. Further, as shown in FIG. 5, the length L1 of the press-fit portion 31 in the axial direction is longer than the length L2 of the coupling portion 42 in the axial direction.

  In the present embodiment, the shaft 4 is configured as a tool main body for rotating the hexagonal socket bolt. The shaft 4 is formed at an elongated shaft portion 41, a coupling portion 42 formed at one end of the shaft portion 41 and coupled to the socket 2, and formed at the other end of the shaft portion 41 and engaged with a hexagonal socket bolt And an action portion 43 acting on the hexagonal socket bolt. The shaft portion 41 is circular in cross section, and the coupling portion 42 and the action portion 43 are hexagonal in cross section. The coupling portion 42 is configured such that the cross-sectional area thereof is larger than the cross-sectional area of the shaft portion 41. On the other hand, the cross-sectional area of the action portion 43 is smaller than the cross-sectional area of the shaft portion 41. The shaft portion 41 and the action portion 43 are formed by cutting a metal rod having a hexagonal cross section. Specifically, first, a metal rod having a cross-sectional area the same as that of the joint 42 is cut to form the shaft 41, and then the end of the shaft 41 opposite to the joint 42 is cut. Thus, the action portion 43 is formed. The shaft 4 is made of a metal that is more rigid than the socket 2.

  The tip tool 1 is inserted into the socket 2 from the side of the fitting opening 33 of the socket 2 so that the shaft portion 4 allows the shaft portion 41 to pass through the guide portion 32, and the coupling portion 42 is inserted into the press-fit portion 21. It is comprised by being press-fit fixed. Hereinafter, the method of manufacturing the tip tool 1 will be described in detail.

  When manufacturing the tip tool 1, a press device 100 is used. The press device 100 includes a die 101 for holding the socket 2 and a liftable punch 102 for pressing the coupling portion 42 of the shaft 4 into the press-fit portion 31 of the socket 2. As shown in FIGS. 3 and 4, the die 101 is formed with a receiving hole 103 for receiving the shaft 4. The depth of the receiving hole 103 is set to a depth that takes into consideration the movement allowance for moving the shaft 4 relative to the socket 2 when the shaft 4 is pressed into the socket 2.

  When manufacturing the tip tool 1, first, as shown in FIG. 3, the socket 2 is set to the die 101 such that the fitting opening 33 side is on the punch 102 side.

  Next, the shaft 4 is inserted into the socket 2 from the side of the fitting opening 33 of the socket 2. At this time, the shaft 4 is inserted from the side of the fitting opening 33 of the socket 2 so that the shaft portion 41 is inserted through the guide portion 32. As a result, as shown in FIG. 3, the acting portion 43 and a part of the shaft portion 41 pass through the press-fit portion 31 and the guide portion 32 and are positioned in the receiving hole 103. As described above, since the diameter of the press-fit portion 31 is smaller than the diagonal distance of the coupling portion 42 of the shaft body 4, the fitting opening 33 of the press-fit portion 31 is shown in FIG. It will be in the state where it was caught at the other end of the side. The action portion 43 of the shaft 4 is not supported and is in a floating state.

  Next, the punch 102 is lowered to press the joint portion 42 in the insertion direction, and the joint portion 42 is press-fit into the press-fit portion 31. At this time, since the shaft body 4 is a metal having a rigidity higher than that of the socket 2, a part of the inner circumferential portion of the press-fit portion 31 is peeled off by the coupling portion 42. Also at this time, the action portion 43 is in a floating state without being supported.

  The press-fitting of the coupling portion 42 into the press-fit portion 31 is terminated before the punch 102 abuts on the axial end of the fitting opening 33. This is to prevent the inside of the cylinder of the socket 2 from being damaged when the punch 102 abuts on the fitting opening 33 or the like. Since the press-fit is completed before the punch 102 abuts on one end of the fitting opening 33 in the axial direction of the fitting opening 33, the end of the fitting opening 33 on the fitting opening 33 protrudes from the press-fit part 31 to the fitting opening 33 It will be in a state of

  Then, after press-fitting the joint portion 42 into the press-fit portion 31, the punch 102 is raised to take out the socket 2 from the die 101, whereby the manufacture of the tip tool 1 is completed.

  As described above, when the shaft 4 is inserted into the socket 2 from the side of the fitting opening 33 of the socket 2 and the coupling portion 42 is press-fitted and fixed to the press-fit portion 31, the acting portion 43 of the shaft 4 There is no direct load on the For this reason, the risk of the action part 43 being deformed at the time of press-fitting can be avoided.

  On the other hand, in the case where the shaft 4 is inserted into the socket 2 from the side of the fitting opening 33 of the socket 2, it is necessary to provide the moving allowance in the receiving hole 103 of the die 102. Therefore, as described above, at the time of press-fitting of the coupling portion 42 into the press-fit portion 31, the end of the insertion direction of the shaft 4, that is, the acting portion 43 of the shaft 2 is not supported but floats It becomes. As a result, at the time of press-fitting, the shaft 4 may shake, and the shaft center of the socket 2 and the shaft center of the shaft 4 may be displaced.

  Therefore, in the first embodiment, by providing the guide portion 32 having a diameter smaller than that of the press-fit portion 31, the displacement of the axial center of the socket 2 and the axial center of the shaft 4 is suppressed. Specifically, since the guide portion 32 has a diameter smaller than that of the press-fit portion 31, the shaft portion 41 may be moved even if the shaft 4 tries to move in the radial direction of the socket 2 when inserting the shaft 4 into the socket 2. Is in contact with the guide portion 32 to suppress the radial shake. Thus, when the shaft 4 is inserted into the socket 2, the shaft 4 is guided by the guide portion 32 along the axial center direction of the socket 2. As a result, the shift between the axial center of the socket 2 and the axial center of the shaft 4 can be suppressed.

  By the provision of the guide portion 32, in the state after coupling of the socket 2 and the shaft body 4, as shown in FIG. A part of the pressed-in portion 31 and the guide portion 32 in the second cylinder and an overlapping portion 44 overlapping in the radial direction of the socket 2 are formed. Since the diameter of the pressed-in portion 31 is larger than the diameter of the shaft portion 41 of the shaft body 4, as shown in FIG. 5, the overlapping portion 44 has a gap 34 with respect to the inner peripheral surface of the pressed-in portion 31. , Located in the socket 2. Further, since the diameter of the guide portion 32 and the diameter of the shaft portion 41 of the shaft 4 are also slightly large, as shown in FIG. 5, the overlapping portion 44 opens a gap 35 from the inner peripheral surface of the guide portion 32. In the socket 2. Furthermore, since the length L1 in the axial direction of the press-fit portion 31 is longer than the length L2 in the axial direction of the coupling portion 42, the above-described clearance in the gap between the press-fit portion 31 and the shaft portion 41 is The axial direction length L3 is larger than the amount L4 of protrusion of the press-fit portion 41 of the coupling portion 41 from the other end.

  If the gaps 34 and 35 exist between the inner peripheral surface of the socket 2 and the shaft 41 of the shaft 4, the gap 35 is formed between the guide 32 and the overlapping portion 44 of the shaft 41, During actual operation by the tip tool 1, there may be a relative movement between the socket 2 and the shaft 4. At the time of actual work, in order to suppress a drop in work accuracy and work efficiency, coaxiality between the axial center of the socket 2 and the axial center of the shaft 4 is required rather than when inserting the shaft 4 into the socket 2 .

  Since the gap 35 between the guide portion 32 and the shaft portion 41 is necessary for smoothly inserting the shaft body 4 into the socket 2, it is not preferable to eliminate the gap 35.

  Therefore, in the first embodiment, the buffer member 50 for suppressing the radial displacement of the shaft portion 41 of the shaft body 4 is provided in the gap 34 between the overlapping portion 44 and the inner circumferential surface of the press-fit portion 31. It is provided to suppress relative shake between the socket 2 and the shaft 4.

  Specifically, when the joint portion 42 is press-fit into the press-fit portion 31, the peeling member 51 peeled off from the inner peripheral portion of the press-fit portion 31 is configured as the buffer member 50. The peeling member 51 is formed in the vicinity of the coupling portion 42 in the gap 34 as shown in FIG. 5.

  When the peeling member 51 as the buffer member 50 is provided, the shaft portion 41 is displaced in the radial direction independently of the socket 2 when the axial portion 41 shakes in the radial direction. The force associated with the shake is input from the portion 41 to the peeling member 51. The peeling member 51 generates a repulsive force to the force input from the shaft portion 41, and pushes back the shaft portion 41 by the repulsive force. Thereby, the shake of the shaft portion 41 is suppressed. In particular, since the peeling member 51 is formed in the vicinity of the coupling portion 42 in the gap 34 between the press-fit portion 31 and the shaft portion 41, the peeling member 51 is a base point of the radial deflection of the shaft portion 41 The shake of the shaft 41 can be suppressed. As a result, relative shake between the socket 2 and the shaft 4 can be effectively suppressed.

  From the above, it is possible to suppress the deviation between the axial center of the socket 2 and the axial center of the shaft 4 even during actual work.

  In addition, since the peeling member 51 is formed while being pushed out to the joint portion 42, the peeling member 51 does not clog the gap 34 closely. For this reason, the peeling member 51 can be appropriately elastically deformed when the force accompanying the shake is input from the shaft portion 41. Thereby, the said blurring can be suppressed, receiving the said blurring of the axial part 41 appropriately.

  Furthermore, by using the peeling member 51 as the buffer member 50, the buffer member 50 does not have to be configured as a separate member, and the number of parts can be reduced.

  Therefore, the end tool 1 according to the first embodiment includes the cylindrical socket 2 and the shaft 4 coupled to the socket 2 by press-fitting, and the shaft 4 is press-fitted into the cylinder of the socket 2 A press-fit portion 31 and a fitting opening 33 to be fitted to the rotary tool are formed, and the shaft 3 is provided with a shaft 41 and one end of the shaft 41 and a connecting portion 42 coupled to the socket 2. , And the shaft 4 is inserted into the socket 2 from the side of the fitting opening 32, and the coupling portion 42 is press-fitted and fixed to the press-fit portion 31. A guide having a smaller diameter than the pressed-in portion 31 for guiding the shaft 4 along the axial center direction of the socket 2 when the shaft 4 is inserted into the socket 2 on the opposite side of the fitting opening 33 to 31 Since the portion 32 is provided, the axial center of the socket 2 and the axial center of the shaft 4 may be displaced. It is possible to suppress.

Second Embodiment
The second embodiment will be described in detail below with reference to the drawings. In the following description, parts in common with Embodiment 1 will be assigned the same reference numerals and detailed explanations thereof will be omitted.

  FIG. 6 shows a tip tool 201 according to the second embodiment. This tip tool 201 is also a tool attached to the rotary tool, as in the first embodiment.

  In the tip tool 201, the action part 24 is provided in the socket 202, and the shaft body 204 is configured as a portion to be attached to the rotating tool.

  The socket 202 is contracted toward one side in the axial direction from the first cylindrical portion 21 having a relatively large outer diameter and one end in the axial direction of the first cylindrical portion 21 as in the first embodiment. A diameter-reduced portion 22 extending in diameter and a second cylindrical portion 23 extending from one end in the axial direction of the diameter-reduced portion 22 toward the one side are provided. Both the first cylindrical portion 21 and the second cylindrical portion 23 have a longer axial length than that of the first embodiment. The socket 202 is made of metal as in the first embodiment.

  As in the first embodiment, the press-fit portion 31 into which the shaft body 204 is press-fitted and the component that is engaged with the component rotated by the rotary tool and acts on the component as in the first embodiment. (Fitting opening) is formed. A guide portion 32 having a diameter smaller than that of the press-fit portion 31 is provided on the opposite side of the press-fit portion 31 to the fitting opening 33. In the second embodiment, as in the first embodiment, when the shaft 204 is inserted into the socket 202, the guide portion 32 guides the shaft 204 along the axial center direction of the socket 202. is there.

  The diameter of the pressed-in portion 31 is shorter than the diagonal distance of the coupling portion 42 of the shaft 204 and longer than the facing distance. Further, the diameter of the pressed-in portion 31 is larger than the diagonal distance of the shaft portion 141 of the shaft body 204. The diameter of the guide portion 32 is slightly larger than the diagonal distance of the shaft portion 141 of the shaft 204.

  In the second embodiment, as shown in FIG. 6, the action portion 24 is formed at the one side portion in the axial direction with respect to the action portion 24 in the first cylindrical portion 21. The action portion 24 is formed in an inner diameter that matches the outer diameter of a bolt or a nut, and has, for example, a hexagonal cross section.

  The shaft 204 is made of a metal that is more rigid than the socket 202. The shaft 204 has an elongated shaft portion 241 and a coupling portion 42 formed at one end of the shaft portion 241 and coupled to the socket 202. In the second embodiment, the shaft portion 241 and the coupling portion 42 both have a hexagonal shape in cross section. The coupling portion 42 is configured such that the cross-sectional area thereof is larger than the cross-sectional area of the shaft portion 241.

  In the second embodiment, an engagement groove 45 for engaging with a chuck (not shown) of the rotary tool is formed in the shaft portion 241 around the outer circumference of the shaft portion 241. When the shaft portion 241 is inserted into the rotary tool, the chuck of the rotary tool engages with the engagement groove 45, whereby the tip tool 201 is locked so as not to fall off the rotary tool.

  Also in the second embodiment, as in the first embodiment, the tip tool 201 is inserted into the socket 202 from the action portion 24 side of the socket 202 so that the shaft portion 241 passes through the guide portion 32, The portion 42 is configured by being press-fitted and fixed to the press-fit portion 21. Thus, the risk of the shaft portion 241 being bent when the connection portion 42 is press-fit into the press-fit portion 31 can be avoided.

  In the second embodiment, at a portion of the overlapping portion 244 located in the press-fit portion 31, the broken portion 46 thinner than the other portions of the overlapping portion 244 and the one in the axial direction in the axial direction than the broken portion 46. A stepped portion 47 formed on the side and thicker than the other portion of the overlapping portion 244 is formed. The fractured portion 46 is thinner than the portion in which the engagement groove 45 is formed. The diameter of the step portion 47 is smaller than the diameter of the pressed-in portion 31 and larger than the diameter of the guide portion 32.

  Since the fractured part 46 is more fragile than the other parts of the shaft 204, when the shaft 204 is broken by the tightening torque when the tip tool 201 performs a tightening operation of a bolt or the like, the broken part 46 is broken. It is easy to break at the position of the part 46. Thus, when the shaft 204 breaks, it can be broken at a specific position. When the shaft 204 is broken at the broken portion 46, the shaft 204 tries to come out of the socket 202, but the step portion 47 is caught by the guide portion 32 and the shaft 204 does not go out of the socket 202. This can prevent the socket 202 from falling when the shaft 204 is broken. That is, in the second embodiment, the guide portion 32 also plays a role as a locking portion that locks the shaft 204.

  Also in the second embodiment, since the guide portion 32 having a diameter smaller than that of the press-fit portion 31 is provided, when the shaft body 204 is inserted into the socket 202, the shaft body 204 is the shaft of the socket 202 by the guide portion 32. You will be guided along the heart direction. Thereby, even if the shaft portion 241 is inserted into the cylinder of the socket 202 from the side of the action portion 24 of the socket 202, it is possible to suppress the deviation between the shaft center of the socket 202 and the shaft center of the shaft body 204.

  Further, since the guide portion 32 is provided, also in the second embodiment, as shown in FIG. A part of the portion 31 and the guide portion 32 and an overlapping portion 244 overlapping in the radial direction of the socket 202 are formed. Since the diameter of the press-fit portion 31 is larger than the diameter of the step portion 47 in the overlapping portion 244, the overlapping portion 244 is, as shown in FIG. Empty and located in socket 202. Further, since the diameter of the guide portion 32 is slightly larger than the diagonal distance between the shaft portions 241 of the shaft body 204, the overlapping portion 244 is, as shown in FIG. And a gap 35 between them and located in the socket 202. Also in the second embodiment, since the gaps 34 and 35 are formed between the inner circumferential surface of the pressed-in portion 31 and the inner periphery of the guide portion 32, and the overlapping portion 244, at the time of actual work by the tip tool 201, There is a possibility that relative shake occurs between the socket 202 and the shaft 204, and the working accuracy and the working efficiency may be reduced.

  On the other hand, also in the second embodiment, the buffer 35 for suppressing the above-described radial displacement of the shaft portion 241 of the shaft body 204 in the gap 35 between the overlapping portion 244 and the inner circumferential surface of the pressed-in portion 31. The peeling member 51 as the member 50 is provided to suppress relative blurring between the socket 202 and the shaft 204. The peeling member 51 is formed by peeling from the inner circumferential surface of the press-fit portion 31 when the shaft 204 is press-fit into the socket 202.

  Due to the provision of the peeling member 51, the socket 202 is displaced in the radial direction independently of the shaft body 204 and when the socket 202 suffers from the radial direction, the socket 202 (especially the second socket 202) The force associated with the shake is input to the peeling member 51 from the cylindrical portion 23). The peeling member 51 generates a repulsive force against the force input from the socket 202, and pushes the socket 202 back by the repulsive force. Thereby, the shake of the socket 202 is suppressed. As a result, relative shake between the socket 202 and the shaft 204 can be suppressed. As a result, also in the second embodiment, it is possible to suppress the deviation between the axial center of the socket 2 and the axial center of the shaft 4 at the time of actual work.

  From the above, even in the case where the action portion 24 is provided in the socket 202 and the shaft body 204 is configured as a portion to be attached to the rotating tool as in the second embodiment, the shaft of the socket 2 is Deviation between the heart and the axis of the shaft 4 can be suppressed.

  Further, in the second embodiment, when the shaft 204 is broken by the tightening torque when the tip tool 201 performs a tightening operation of a bolt or the like, it can be broken at a specific position. Furthermore, even if the shaft 204 is broken at the broken portion 46, the socket 202 can be prevented from dropping by the step portion 47 being caught by the guide portion 32.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be substituted without departing from the scope of the claims.

  For example, in the above-described first and second embodiments, the peeling member 51 is employed as the buffer member 50. However, the present invention is not limited to this, and may be made of a rubber member or the like.

  Moreover, in the above-mentioned Embodiment 2, although it formed by making the fracture | rupture part 46 thinner than the other part of the duplication part 244, not only this but the structure which is easy to fracture | rupture than the other part in the duplication part 244 If possible, it is not necessary to make the break 46 thinner than the other part of the overlap 244.

  Furthermore, in the above-described first and second embodiments, the shape of the coupling portion 42 is hexagonal in cross section, but it may be a hexagonal cross section if it can be press-fit into the press-fit portion 31 of the socket 2 or 202. Good.

  The embodiments described above are merely illustrative and should not be construed as limiting the scope of the present invention. The scope of the present invention is defined by the claims, and all variations and modifications that fall within the equivalent scope of the claims fall within the scope of the present invention.

  The present invention is useful as a tip tool attached to a rotary tool.

1,201 Tip tool 2,202 Socket 4,204 Shaft 24 Action part (fitting opening)
31. Press-fit portion 32. Guide portion 33. Fitting opening 34. Clearance (a gap between the inner peripheral surface of the guide portion and the overlapping portion).
35 Clearance (the clearance between the inner circumferential surface of the pressed-in portion and the overlapping portion)
41, 241 shaft portion 42 coupling portion 44, 244 overlapping portion L3 axial direction length L4 in the gap between the axial portion and the pressed-in portion

Claims (3)

A tip tool attached to the rotating tool,
With a cylindrical socket,
And a shaft coupled to the socket by press fitting,
In the cylinder of the socket, a press-fit portion into which the shaft body is press-fit, and a fitting opening that fits the rotating tool or a component rotated by the rotating tool are formed.
The shaft body has a shaft portion and a coupling portion provided at one end of the shaft portion and coupled to the socket,
The shaft body is inserted into the socket from the fitting opening side, and the coupling portion is press-fitted and fixed to the pressed-in portion,
In the cylinder of the socket, the shaft is guided along the axial center direction of the socket when the shaft is inserted into the socket on the side opposite to the fitting opening with respect to the pressed-in portion A tip tool characterized in that a guide portion having a diameter smaller than that of the press-fit portion is provided. In the tip tool according to claim 1,
A portion in the vicinity of the coupling portion in the shaft portion of the shaft body is an overlapping portion that overlaps in a radial direction with a part of the pressed-in portion and the guide portion,
The overlapping portion is positioned with a gap in the radial direction with respect to the inner peripheral surface of the pressed-in portion and the inner peripheral surface of the guide portion,
In the gap between the inner peripheral surface of the pressed-in portion and the overlapping portion, a buffer member for suppressing relative shake between the socket and the shaft is provided. tool. In the tip tool according to claim 2,
The tip end tool characterized in that the buffer member is a peeling member which is peeled from an inner circumferential surface of the press-fit portion when the shaft body is press-fit into the socket.

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