JP7018646B2 - Tip tool - Google Patents

Description

The present invention belongs to the technical field relating to a tip tool mounted on a rotary tool.

Conventionally, a tip tool attached to a rotary tool has been known.

Patent Document 1 describes a connection shaft portion (shaft body) that can be connected to a rotary tool, a socket portion having a receiving port that can be fitted to a nut or the like, and a connection that connects the base end side of the socket portion and the connection shaft portion. Disclosed is a tip tool having a member, the connecting member being made of a metal cylinder, and a stopper ring for preventing a fall provided on the outer periphery of a connecting shaft portion inside the connecting member.

Patent Document 2 includes a rotary tool mounting shaft portion (shaft body) mounted on a rotary tool and a socket portion having a fitting port for a nut or the like, and in a joint portion with the socket portion in the rotary tool mounting shaft portion. A tip tool having a peripheral groove formed in a joint portion is disclosed. In Patent Document 2, the rotary tool mounting shaft portion is press-fitted into the socket portion from the side opposite to the fitting port in the socket portion.

Japanese Unexamined Patent Publication No. 2012-143855 Japanese Unexamined Patent Publication No. 6-226651

By the way, in the tip tools as described in Patent Documents 1 and 2, the shaft body is provided with a coupling portion to be coupled to the socket portion and a shaft portion thinner than the coupling portion, while the socket portion is provided with a rotary tool or fastening. A fitting port for fitting the component and a press-fitting portion to which the joint portion is press-fitted and fixed are provided. Then, at the time of manufacturing the tip tool, generally, as described in Patent Document 2, the shaft body is press-fitted from the side opposite to the fitting port of the socket portion.

When the shaft body is configured as a portion to be mounted on the rotary tool and the socket portion is configured as a portion acting on the fastener portion or the like as described in Patent Document 1, the fitting port of the socket portion is fitted with the fastener portion or the like. It is configured to do. When manufacturing such a tip tool, the shaft body is press-fitted from the end portion of the shaft portion on the side opposite to the socket portion. At this time, the shaft portion may be bent.

On the other hand, the socket portion is a portion mounted on the rotary tool, and the shaft body may be a portion acting on the fastening parts or the like. In this case, an acting portion (a portion acting on the fastening member or the like) is formed at the end of the shaft body on the opposite side of the socket portion, and the fitting port of the socket portion is configured to fit the rotary tool. When manufacturing such a tip tool, the punch of the press machine and the working portion are brought into contact with each other, and the force is input from the working portion. Therefore, a load is directly applied to the working part, and the working part may be deformed.

As a method for suppressing deformation of the shaft body when the shaft body is press-fitted into the socket portion as described above, the shaft body is inserted from the fitting port side of the socket portion, and the joint portion of the shaft body is inserted into the socket. A method of press-fitting and fixing to the press-fitted portion can be considered. When the shaft body is inserted into the socket by such a method, the end portion of the shaft body in the insertion direction is floated so that the shaft body can move toward the side opposite to the fitting port due to press fitting. To. Therefore, the shaft body may be shaken during press fitting, and the shaft center of the socket portion and the shaft center of the shaft body may be displaced from each other.

The present invention has been made in view of these points, and an object of the present invention is to fit a press-fitted portion into which a shaft body is press-fitted and a fitting port for fitting a rotary tool or a component rotated by a rotary tool. In a tip tool configured by inserting a shaft body from the fitting port side of the socket with respect to the socket formed with and, the purpose is to prevent the axis of the socket and the axis of the shaft from being displaced from each other.

In order to solve the above problems, the present invention targets a tip tool that is mounted on a rotary tool and transmits a rotational force to the rotary object, and is mounted on the rotary tool or fitted to the rotary object. It is coupled to the tubular socket by press fitting, and when the socket is attached to the rotating tool, it engages with the rotating object, while when the socket fits into the rotating object, the above. A shaft body to be mounted on the rotary tool is provided, and a press-fitted portion into which the shaft body is press-fitted and a fitting port for fitting the rotary tool or the object to be rotated are formed in the cylinder of the socket. The shaft body has a joint portion press-fitted to the socket and an end that is thinner than the joint portion and extends from the joint portion toward the side opposite to the fitting port and is opposite to the joint portion. The portion has the rotary tool or the shaft portion that engages with the rotating object, the shaft body is inserted into the socket from the fitting port side, and the joint portion is press-fitted and fixed to the press-fitted portion. In the cylinder of the socket, on the side opposite to the fitting port with respect to the press-fitting portion, the shaft body is placed on the axis of the socket when the shaft body is inserted into the socket. A guide portion having a diameter smaller than that of the press-fitted portion and a diameter larger than that of the shaft portion is provided to guide along the direction.

According to this configuration, since the shaft body is inserted into the socket from the fitting port side, when the joint portion of the shaft body is press-fitted into the press-fitted portion of the socket, the end portion of the shaft body in the insertion direction is in a floating state. To. Therefore, the shaft body may be shaken during press fitting, and the shaft center of the socket and the shaft center of the shaft body may be displaced from each other. On the other hand, in the present invention, since the guide portion having a diameter smaller than that of the press-fitted portion is provided, it is possible to suppress the deviation between the axial center of the socket and the axial center of the axial body. Specifically, since the guide portion has a smaller diameter than the press-fitted portion, even if the shaft body tries to shake in the radial direction of the socket, the shaft portion abuts on the guide portion and the shake in the radial direction is suppressed. As a result, when the shaft body is inserted into the socket, the shaft body is guided along the axial direction of the socket by the guide portion. As a result, it is possible to suppress the deviation between the axis of the socket and the axis of the axis.

In one embodiment of the tip tool, the portion in the vicinity of the joint portion in the shaft portion of the shaft body is a part of the press-fitted portion and a radial overlap portion with the guide portion, and the overlap portion. Is located with a gap in the radial direction with respect to the inner peripheral surface of the press-fitted portion and the inner peripheral surface of the guide portion, and is located in the gap between the inner peripheral surface of the press-fitted portion and the overlapping portion. Is provided with a cushioning member for suppressing relative shake between the socket and the shaft body.

That is, the guide portion is usually formed to have a slightly larger diameter than the shaft portion so that the shaft body can be smoothly inserted into the socket. Therefore, the overlapping portion of the shaft portion is located with a radial gap with respect to the inner peripheral surface of the guide portion. Although the guide portion can suppress the deviation between the axis of the socket and the axis of the shaft body, the gap between the shaft portion and the inner peripheral surface of the guide portion allows the socket to be used during actual work with a tip tool. Relative blurring may occur between the shaft and the shaft. In actual work, the coaxiality between the axis of the socket and the axis of the axis is required more than when the axis is inserted into the socket.

Therefore, in the present invention, the relative shake between the socket and the shaft body is suppressed by disposing a cushioning member in the gap between the inner peripheral surface of the press-fitted portion and the overlapping portion. Specifically, for example, the shaft body is provided with an action portion that acts on a part rotated by the rotary tool, and when the socket is mounted on the rotary tool, the shaft body has a radial direction independent of the socket. Shake is likely to occur. When the radial shake of the shaft body occurs, the shaft portion is displaced in the radial direction, and the force due to the shake is input from the shaft portion to the cushioning member. The cushioning member generates a repulsive force against the force input from the shaft portion, and pushes back the shaft portion by the repulsive force. As a result, the shake of the shaft portion is suppressed.

On the contrary, when the socket is provided with an action portion and the shaft body is mounted on the rotary tool, the socket tends to have a radial shake independent of the shaft body. Even in this case, when the socket is displaced in the radial direction, a force due to the shake is input from the socket to the cushioning member. The shock absorber pushes the socket back with a repulsive force against the force input from the socket. This suppresses the shake of the socket. Therefore, even during actual work, it is possible to suppress the deviation between the axis of the socket and the axis of the shaft.

In the tip tool, the cushioning member is preferably a peeling member that is peeled off from the inner peripheral surface of the press-fitted portion when the shaft body is press-fitted into the socket.

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

Further, since the peeling member is formed while being extruded by the joint portion, the peeling member is not tightly clogged in the gap between the inner peripheral surface of the press-fitted portion and the overlapping portion. Therefore, the peeling member can be appropriately elastically deformed when the force associated with the above-mentioned shake is input from the shaft portion. As a result, it is possible to suppress the shake while appropriately receiving the shake of the shaft portion.

Further, it is not necessary to configure the cushioning member as a separate member, and the number of parts can be reduced.

As described above, according to the tip tool according to the present invention, a guide portion having a diameter smaller than that of the press-fitted portion is provided on the side opposite to the fitting port with respect to the press-fitted portion in the cylinder of the socket, and the guide portion provides the guide portion. When the shaft body is inserted into the socket, the shaft body is guided along the axis direction of the socket, so that it is possible to prevent the axis center of the socket from being displaced from the axis center of the shaft body.

It is a half sectional view which shows the tip tool which concerns on embodiment of this invention. It is the rear view which looked at the tip tool from the socket side. It is sectional drawing which shows the state before press-fitting the joint part of a shaft body into the press-fitting part of a socket in the middle of manufacturing a tip tool. FIG. 3 is a cross-sectional view showing a state in which the joint portion of the shaft body is press-fitted into the press-fitted portion of the socket from the state of FIG. It is a partial cross-sectional view which enlarged the periphery of the joint part of a socket and a shaft body in a tip tool. It is a half sectional view which shows the tip tool which concerns on Embodiment 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a tip tool 1 according to the present embodiment. The tip tool 1 is a tool attached to a rotary tool. The rotary tools include manual and electric tools, such as ratchet handles and impact wrenches.

The tip tool 1 includes a tubular socket 2 and a long shaft body 4 that is press-fitted into the socket 2. As shown in FIG. 1, the shaft body 4 extends from one end of the socket 2 in the axial direction toward one side in the axial direction.

In the present embodiment, the socket 2 is configured as a portion to be mounted on the rotary tool. As shown in FIG. 1, the socket 2 is formed in a cylindrical shape. Specifically, the socket 2 is contracted so as to extend from one end of the first cylindrical portion 21 having a relatively large outer diameter and the first cylindrical portion 21 in the axial direction while reducing the diameter toward one side in the axial direction. It has a diameter portion 22 and a second cylindrical portion 23 extending from one end of the diameter reduction portion 22 in the axial direction toward the one side. The first cylindrical portion 21, the reduced diameter portion 22, and the second cylindrical portion 23 are coaxial. Two groove portions 21a are formed on the outer periphery of the first cylindrical portion 21. The two groove portions 21a 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-fitting portion 31 into which the shaft body 4 is press-fitted and a fitting port 33 for fitting the rotary tool are formed. As shown in FIG. 1, the fitting port 33 is formed in the first cylindrical portion 31. The press-fitted portion 31 extends from one end of the fitting port 33 in the axial direction, and is a portion of the first cylindrical portion 21 in the axial direction of the socket 2, a reduced diameter portion 32, and a guide portion 32. It is formed over the other side portion in the axial direction. A plurality of engaging holes 33a that engage with the chuck of the rotary tool are formed in the fitting port 33 side by side in the circumferential direction. When the fitting port 33 is fitted with the rotary tool, the chuck of the rotary tool engages with the engagement hole 33a, so that the tip tool 1 is locked so as not to fall out of the rotary tool.

In the cylinder of the socket 2, a guide portion 32 having a diameter smaller than that of the press-fitting portion 31 is provided on the side opposite to the fitting port 33 with respect to the press-fitting portion 31. The guide portion 32 extends from one end of the press-fitted portion 31 in the axial direction, and is formed in the second cylindrical portion 23. As will be described in detail later, the guide portion 32 guides the shaft body 4 along the axial center direction when the shaft body 4 is inserted into the socket 2.

As shown in FIG. 2, the diameter of the press-fitted portion 31 is shorter than the diagonal distance of the joint portion 42 described later of the shaft body 4 and longer than the face-to-face distance. Further, the diameter of the press-fitted portion 31 is larger than the diameter of the shaft portion 41 described later of the shaft body 4. The diameter of the guide portion 32 is slightly larger than the diameter of the shaft portion 41 of the shaft body 4. Further, as shown in FIG. 5, the length L1 of the press-fitted 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 body 4 is configured as a tool body for rotating a hexagon socket head cap screw. The shaft body 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 the other end of the shaft portion 41, and engages with a hexagon socket head bolt. It has an acting portion 43 that acts on the hexagon socket head bolt. The shaft portion 41 has a circular cross section, and the connecting portion 42 and the working portion 43 have a hexagonal cross section. The joint portion 42 is configured so that its cross-sectional area is larger than the cross-sectional area of the shaft portion 41. On the other hand, the cross-sectional area of the working portion 43 is smaller than the cross-sectional area of the shaft portion 41. The shaft portion 41 and the working portion 43 are formed by cutting a metal rod having a hexagonal cross section. Specifically, first, a metal rod having a hexagonal cross section having the same cross-sectional area as the joint portion 42 is cut to form the shaft portion 41, and then the end portion of the shaft portion 41 opposite to the joint portion 42 is cut. The working portion 43 is formed. The shaft body 4 is made of a metal having a higher rigidity than the socket 2.

In the tip tool 1, the shaft body 4 is inserted into the socket 2 from the fitting port 33 side of the socket 2 so that the shaft portion 41 inserts the guide portion 32, and the coupling portion 42 is inserted into the press-fitting portion 21. It is configured by being press-fitted and fixed. Hereinafter, the manufacturing method of the tip tool 1 will be described in detail.

When manufacturing the tip tool 1, the press device 100 is used. The press device 100 includes a die 101 for holding the socket 2 and an elevating and lowering punch 102 for press-fitting the coupling portion 42 of the shaft body 4 into the press-fitting 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 body 4. The depth of the receiving hole 103 is set in consideration of the movement allowance for the amount of movement of the shaft body 4 relative to the socket 2 when the shaft body 4 is press-fitted into the socket 2.

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

Next, the shaft body 4 is inserted into the socket 2 from the fitting port 33 side of the socket 2. At this time, the shaft body 4 is inserted from the fitting port 33 side of the socket 2 so that the shaft portion 41 passes through the guide portion 32. As a result, as shown in FIG. 3, a part of the working portion 43 and the shaft portion 41 is located in the receiving hole 103 through the press-fitting portion 31 and the guide portion 32. As described above, since the diameter of the press-fitted portion 31 is shorter than the diagonal distance of the joint portion 42 of the shaft body 4, the fitting port 33 of the press-fitted portion 31 is as shown in FIG. 3 at the stage before press-fitting. It will be in a state of being caught on the other end of the side. The acting portion 43 of the shaft body 4 is in a floating state without being supported.

Next, the punch 102 is lowered, the coupling portion 42 is pressed in the insertion direction, and the coupling portion 42 is press-fitted into the press-fitting portion 31. At this time, since the shaft body 4 is made of a metal having a higher rigidity than the socket 2, a part of the inner peripheral portion of the press-fitted portion 31 is peeled off by the coupling portion 42. Further, even at this time, the acting portion 43 is not supported and is in a floating state.

The press-fitting of the coupling portion 42 into the press-fitting portion 31 is completed before the punch 102 comes into contact with one end of the fitting port 33 in the axial direction. This is to prevent the inside of the socket 2 from being damaged by the punch 102 coming into contact with the fitting port 33 or the like. Since the press-fitting is terminated before the punch 102 abuts on one end of the fitting port 33 in the axial direction, the end portion of the fitting portion 42 on the fitting port 33 side protrudes from the press-fitting portion 31 toward the fitting port 33. It will be in the state of.

Then, after the coupling portion 42 is press-fitted into the press-fitting portion 31, the punch 102 is raised and the socket 2 is taken out from the die 101 to complete the production of the tip tool 1.

As described above, if the shaft body 4 is inserted into the socket 2 from the fitting port 33 side of the socket 2 and the coupling portion 42 is press-fitted and fixed to the press-fitting portion 31, the working portion 43 of the shaft body 4 is formed. Is not directly loaded. Therefore, it is possible to avoid the risk of the acting portion 43 being deformed at the time of press fitting.

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

Therefore, in the first embodiment, the guide portion 32 having a diameter smaller than that of the press-fitted portion 31 is provided to prevent the axial center of the socket 2 and the axial center of the axial body 4 from being displaced from each other. Specifically, since the guide portion 32 has a smaller diameter than the press-fitted portion 31, when the shaft body 4 is inserted into the socket 2, even if the shaft body 4 tries to move in the radial direction of the socket 2, the shaft portion 41 Is in contact with the guide portion 32, and the radial shake is suppressed. As a result, when the shaft body 4 is inserted into the socket 2, the shaft body 4 is guided along the axial center direction of the socket 2 by the guide portion 32. As a result, it is possible to suppress the deviation between the axial center of the socket 2 and the axial center of the axial body 4.

Since the guide portion 32 is provided, in the state after the socket 2 and the shaft body 4 are coupled to each other, a socket is provided in the vicinity of the coupling portion 42 in the shaft portion 41 of the shaft body 4, as shown in FIG. A part of the press-fitted portion 31 and the guide portion 32 in the cylinder of 2 and the overlapping portion 44 overlapping in the radial direction of the socket 2 are formed. Since the diameter of the press-fitted portion 31 is larger than the diameter of the shaft portion 41 of the shaft body 4, the overlapping portion 44 has a gap 34 with respect to the inner peripheral surface of the press-fitted portion 31 as shown in FIG. , Located in the socket 2. Further, since the diameter of the guide portion 32 is slightly larger than the diameter of the shaft portion 41 of the shaft body 4, the overlapping portion 44 has a gap 35 with respect to the inner peripheral surface of the guide portion 32 as shown in FIG. And is located in the socket 2. Further, since the length L1 in the axial direction of the press-fitted portion 31 is longer than the length L2 in the axial center direction of the coupling portion 42, the above-mentioned in the gap between the press-fitted portion 31 and the shaft portion 41. The length L3 in the axial direction is larger than the protrusion amount L4 from the other end of the press-fitted portion 41 of the coupling portion 41.

When there are gaps 34 and 35 between the inner peripheral surface of the socket 2 and the shaft portion 41 of the shaft body 4, the gap 35 is formed between the guide portion 32 and the overlapping portion 44 of the shaft portion 41. During actual work with the tip tool 1, relative shake may occur between the socket 2 and the shaft body 4. In actual work, in order to suppress deterioration of work accuracy and work efficiency, coaxiality between the axis of the socket 2 and the axis of the axis 4 is required more than when the axis 4 is inserted 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 cushioning member 50 for suppressing the radial shake of the shaft portion 41 of the shaft body 4 is provided in the gap 34 between the overlapping portion 44 and the inner peripheral surface of the press-fitted portion 31. It is provided to suppress relative shake between the socket 2 and the shaft body 4.

Specifically, when the coupling portion 42 is press-fitted into the press-fitting portion 31, the peeling member 51 peeled off from the inner peripheral portion of the press-fitting portion 31 is configured as the cushioning member 50. As shown in FIG. 5, the peeling member 51 is formed in the vicinity of the connecting portion 42 in the gap 34.

When the peeling member 51 as the cushioning member 50 is provided, the shaft portion 41 is displaced in the radial direction when the radial shake occurs in the shaft portion 41 independently of the socket 2, and the shaft portion 41 is displaced in the radial direction. The force associated with the above-mentioned vibration is input from the portion 41 to the peeling member 51. The peeling member 51 generates a repulsive force against the force input from the shaft portion 41, and pushes back the shaft portion 41 by the repulsive force. As a result, the shake of the shaft portion 41 is suppressed. In particular, since the peeling member 51 is formed in the vicinity of the connecting portion 42 in the gap 34 between the press-fitted portion 31 and the shaft portion 41, the peeling member 51 is formed at a position serving as a base point for the radial shake of the shaft portion 41. The shake of the shaft portion 41 can be suppressed. As a result, the relative shake between the socket 2 and the shaft body 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 body 4 even during actual work.

Further, since the peeling member 51 is formed while being extruded by the joint portion 42, the peeling member 51 is not tightly clogged in the gap 34. Therefore, the peeling member 51 can be appropriately elastically deformed when the force associated with the above-mentioned shake is input from the shaft portion 41. As a result, it is possible to suppress the shake while appropriately receiving the shake of the shaft portion 41.

Further, by using the peeling member 51 as the cushioning member 50, it is not necessary to configure the cushioning member 50 as a separate member, and the number of parts can be reduced.

Therefore, the tip tool 1 according to the first embodiment includes a tubular socket 2 and a shaft body 4 coupled to the socket 2 by press fitting, and the shaft body 4 is press-fitted into the cylinder of the socket 2. The press-fitted portion 31 and the fitting port 33 to be fitted to the rotary tool are formed, and the shaft body 3 is provided at one end of the shaft portion 41 and the coupling portion 42 and is coupled to the socket 2. The shaft body 4 is inserted into the socket 2 from the fitting port 32 side, and the coupling portion 42 is press-fitted and fixed to the press-fitting portion 31. On the side opposite to the fitting port 33 with respect to 31, a guide having a smaller diameter than the press-fitting portion 31 that guides the shaft body 4 along the axial center direction of the socket 2 when the shaft body 4 is inserted into the socket 2. Since the portion 32 is provided, it is possible to prevent the axial center of the socket 2 and the axial center of the axial body 4 from being displaced from each other.

(Embodiment 2)
Hereinafter, the second embodiment will be described in detail with reference to the drawings. In the following description, the parts common to the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

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

In the tip tool 201, the working portion 24 is provided in the socket 202, and the shaft body 204 is configured as a portion to be mounted on the rotary tool.

Similar to the first embodiment, the socket 202 contracts 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 toward one side in the axial direction. It has a diameter-reduced portion 22 extending with diameter, and a second cylindrical portion 23 extending toward one side from one end of the diameter-reduced portion 22 in the axial direction. Both the first cylindrical portion 21 and the second cylindrical portion 23 have a longer length in the axial direction than that of the first embodiment. The socket 202 is made of metal as in the first embodiment.

In the cylinder of the socket 202, as in the first embodiment, the press-fitted portion 31 into which the shaft body 204 is press-fitted and the acting portion 24 which is fitted with the component rotated by the rotary tool and acts on the component. (Mating port) is formed. A guide portion 32 having a diameter smaller than that of the press-fitted portion 31 is provided on the side opposite to the fitting port 33 with respect to the press-fitted portion 31. Also in the second embodiment, similarly to the first embodiment, the guide portion 32 guides the shaft body 204 along the axial direction of the socket 202 when the shaft body 204 is inserted into the socket 202. be.

The diameter of the press-fitted portion 31 is shorter than the diagonal distance of the joint portion 42 of the shaft body 204 and longer than the face-to-face distance. Further, the diameter of the press-fitted 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 body 204.

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

The shaft body 204 is made of a metal having a higher rigidity than the socket 202. The shaft body 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, both the shaft portion 241 and the connecting portion 42 have a hexagonal cross section. The joint portion 42 is configured so that its cross-sectional area is larger than the cross-sectional area of the shaft portion 241.

In the second embodiment, the shaft portion 241 is formed with an engaging groove 45 for engaging with the chuck (not shown) of the rotary tool so as to go 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 engaging groove 45, so that the tip tool 201 is locked so as not to fall out of the rotary tool.

Also in the second embodiment, similarly to the first embodiment, the tip tool 201 is inserted into the socket 202 from the acting portion 24 side of the socket 202 so that the shaft portion 241 inserts the guide portion 32, and is coupled. The portion 42 is press-fitted and fixed to the press-fitted portion 21. As a result, it is possible to avoid the risk that the shaft portion 241 will be bent when the coupling portion 42 is press-fitted into the press-fitting portion 31.

In the second embodiment, the portion of the overlapped portion 244 located within the press-fitted portion 31 has a fractured portion 46 thinner than the other portion of the overlapped portion 244 and the above-mentioned one in the axial direction of the fractured portion 46. A stepped portion 47 formed on the side and thicker than the other portions of the overlapping portion 244 is formed. The broken portion 46 is thinner than the portion where the engaging groove 45 is formed. The diameter of the step portion 47 is smaller than the diameter of the press-fitted portion 31 and larger than the diameter of the guide portion 32.

Since the broken portion 46 is more fragile than the other parts of the shaft body 204, if the shaft body 204 is broken by the tightening torque when tightening a bolt or the like with the tip tool 201, the broken portion 46 is broken. It is easy to break at the position of the portion 46. As a result, when the shaft body 204 breaks, it can be broken at a specific position. Then, when the shaft body 204 is broken at the broken portion 46, the shaft body 204 tries to come out of the socket 202, but the stepped portion 47 is caught by the guide portion 32 and the shaft body 204 cannot be pulled out from the socket 202. This makes it possible to prevent the socket 202 from falling when the shaft body 204 breaks. That is, in the second embodiment, the guide portion 32 also serves as a locking portion for locking the shaft body 204.

Also in the second embodiment, since the guide portion 32 having a diameter smaller than that of the press-fitted 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. Guided along the direction of the heart. As a result, even if the shaft portion 241 is inserted into the cylinder of the socket 202 from the working portion 24 side of the socket 202, the deviation between the shaft center of the socket 202 and the shaft center of the shaft body 204 can be suppressed.

Further, since the guide portion 32 is provided, even in the second embodiment, the socket 202 is press-fitted in the cylinder of the socket 202 in the vicinity of the coupling portion 42 in the shaft portion 241 of the shaft body 204, as shown in FIG. A part of the portion 31 and the guide portion 32 are formed with an overlapping portion 244 overlapping in the radial direction of the socket 202. Since the diameter of the press-fitted portion 31 is larger than the diameter of the stepped portion 47 in the overlapping portion 244, the overlapping portion 244 has a gap 34 in the radial direction with the inner peripheral surface of the press-fitted portion 31 as shown in FIG. It is vacant and located in socket 202. Further, since the diameter of the guide portion 32 is slightly larger than the diagonal distance of the shaft portion 241 of the shaft body 204, the overlapping portion 244 is the inner peripheral surface of the guide portion 32 and the radial direction as shown in FIG. It is located in the socket 202 with a gap 35 in between. Also in the second embodiment, since the gaps 34 and 35 are formed between the inner peripheral surface of the press-fitted portion 31 and the inner peripheral surface of the guide portion 32 and the overlapping portion 244, the gaps 34 and 35 are formed during the actual work by the tip tool 201. Relative blurring may occur between the socket 202 and the shaft body 204, which may reduce work accuracy and work efficiency.

On the other hand, also in the second embodiment, a buffer for suppressing the radial shake of the shaft portion 241 of the shaft body 204 in the gap 35 between the overlapping portion 244 and the inner peripheral surface of the press-fitted portion 31. A peeling member 51 is provided as the member 50 to suppress relative shake between the socket 202 and the shaft body 204. The peeling member 51 is formed by being peeled from the inner peripheral surface of the press-fitted portion 31 when the shaft body 204 is press-fitted into the socket 202.

Due to the provision of the peeling member 51, when the socket 202 is shaken in the radial direction independently of the shaft body 204, the socket 202 is displaced in the radial direction and the socket 202 (particularly the second one) is provided. The force associated with the above-mentioned vibration is input from the cylindrical portion 23) to the peeling member 51. The peeling member 51 generates a repulsive force against the force input from the socket 202, and the repulsive force pushes the socket 202 back. As a result, the shake of the socket 202 is suppressed. As a result, the relative shake between the socket 202 and the shaft body 204 can be suppressed. As a result, even 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 axial body 4 during actual work.

From the above, even when the working portion 24 is provided on the socket 202 and the shaft body 204 is configured as a portion to be mounted on the rotary tool as in the second embodiment, the shaft of the socket 2 is provided. It is possible to suppress the deviation between the center and the axis of the shaft body 4.

Further, in the second embodiment, when the bolt or the like is tightened by the tip tool 201, if the shaft body 204 is broken by the tightening torque, the shaft body 204 can be broken at a specific position. Further, even if the shaft body 204 is broken at the broken portion 46, it is possible to prevent the socket 202 from falling because the stepped portion 47 is caught by the guide portion 32.

(Other embodiments)
The present invention is not limited to the above embodiment, and can be substituted within a range that does not deviate from the gist of the claims.

For example, in the above-mentioned first and second embodiments, the peeling member 51 is adopted as the cushioning member 50, but the present invention is not limited to this, and a rubber member or the like may be used.

Further, in the above-described second embodiment, the broken portion 46 is formed by making the broken portion 46 thinner than the other portions of the overlapping portion 244, but the present invention is not limited to this, and the structure is more likely to break than the other portions of the overlapping portion 244. If possible, it is not necessary to make the fractured portion 46 thinner than the other portions of the overlapping portion 244.

Further, in the above-described first and second embodiments, the shape of the connecting portion 42 is a hexagonal cross section, but if the shape can be press-fitted into the press-fitted portion 31 of the sockets 2 and 202, the shape may not be a hexagonal cross section. good.

The above embodiments are merely examples, and the scope of the present invention should not be construed in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and modifications belonging to the equivalent scope of the claims are within the scope of the present invention.

The present invention is useful as a tip tool mounted on a rotary tool.

1,201 Tip tool 2,202 Socket 4,204 Shaft body 24 Acting part (fitting port)
31 Press-fitted portion 32 Guide portion 33 Fitting port 34 Gap (gap between the inner peripheral surface of the guide portion and the overlapping portion)
35 Gap (gap between the inner peripheral surface of the press-fitted part and the overlapping part)
41,241 Shaft 42 Coupling part 44,244 Overlapping part L3 Length in the axial direction in the gap between the shaft part and the press-fitted part L4 Protrusion amount of the joint part

Claims (3)

A tip tool that is attached to a rotary tool and transmits rotational force to a rotating object .
A cylindrical socket mounted on the rotating tool or fitted to the rotating object ,
It is coupled to the socket by press fitting, and when the socket is attached to the rotating tool, it engages with the rotating object, while when the socket fits into the rotating object, it is attached to the rotating tool. Equipped with a shaft
In the cylinder of the socket, a press-fitted portion into which the shaft body is press-fitted and a fitting port for fitting the rotary tool or the object to be rotated are formed.
The shaft body has a joint portion press-fitted to the socket and an end portion that is thinner than the joint portion and extends from the joint portion toward the side opposite to the fitting port and is opposite to the joint portion. Has a shaft portion that engages with the rotating tool or the rotating object .
The shaft body is inserted into the socket from the fitting port side, and the joint portion is press-fitted and fixed to the press-fitted portion.
In the cylinder of the socket, on the side opposite to the fitting port with respect to the press-fitting portion, the shaft body is guided along the axial center direction of the socket when the shaft body is inserted into the socket. , A tip tool characterized in that a guide portion having a diameter smaller than that of the press-fitted portion and a diameter larger than that of the shaft portion is provided. In the tip tool according to claim 1,
The portion of the shaft body in the vicinity of the coupling portion in the shaft portion is a part of the press-fitted portion and a radial overlap portion with the guide portion.
The overlapping portion is located with a gap in the radial direction with respect to the inner peripheral surface of the press-fitted portion and the inner peripheral surface of the guide portion.
The tip is provided with a cushioning member for suppressing relative shake between the socket and the shaft body in the gap between the inner peripheral surface of the press-fitted portion and the overlapping portion. tool. In the tip tool according to claim 2,
The tip tool is characterized in that the cushioning member is a peeling member that is peeled off from the inner peripheral surface of the press-fitted portion when the shaft body is press-fitted into the socket.

Images