JP2010089168A - Tool socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool socket having excellent heat radiation, and capable of preventing a stress concentration. <P>SOLUTION: The tool socket is provided with a socket body 20 whose one end has a socket 21 and the other end has a shaft rod insertion part 22 for inserting a tool mounting shaft rod 30 therein, respectively, and the tool mounting shaft rod 30 whose one end has a socket body mount 31 and the other end has a tool mount 32, respectively. The shaft rod insertion part 22 has a ring spring interior groove 25 for housing a ring spring 40 and the socket body mount 31 has a ring spring exterior groove 35 for armoring the ring spring 40. Besides, the tool mount shaft rod 30 is mounted in the shaft rod insertion part 22 through the ring spring fitted in the ring spring exterior groove 35 and the ring spring interior groove 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tool socket used by being connected to a tool (such as an electric tool, an air tool, and a hand tool).

  The tool socket usually has a small-diameter shaft bar for gripping the chuck of the tool at the rear end of the cylindrical socket body, and a socket (hole) that fits the bolt / nut head at the tip. .

  For example, Patent Document 1 states that “a socket portion having a rotary tool mounting shaft portion such as an electric / charging driver and an air driver on one end side in the axial direction and a fitting hole such as a nut / bolt head on the other end side”. In the rotary tool socket provided, the shaft portion and the socket portion are separated, the shaft portion is made of high alloy steel having wear resistance and toughness, the socket portion is made of wear resistant high alloy steel, and the shaft An invention relating to a rotary tool socket characterized in that the part is integrated by being fitted and connected to the socket part is disclosed.

  In Patent Document 2, “in a method of manufacturing a socket with a shaft in which a polygonal shaft that is detachably attached to an output portion of a rotary tool is provided at the base end of the socket body, the socket body is formed of aluminum or an aluminum alloy material. The polygonal shaft body is formed of a steel material, and the socket body is formed with a base end protruding to form a mounting hole in which the shaft body can be inserted and fixed. When the shaft body is inserted into the mounting hole, The mounting hole is set to a rough diameter relative to the dimension of the shaft body, and the mounting hole is set to the rough dimension without setting the hole diameter so that residual stress is generated in the socket body when the body is inserted into the press-fitted state. A shaft body is inserted into the socket body, and external pressure is applied to the socket body from the direction of the hole axis and the outer periphery of the mounting hole to cause plastic flow in the socket body, and the shaft body is crimped and fixed in the mounting hole. Be Socket manufacturing method of the attached. Invention is disclosed about. "

  Patent Document 3 states that “a socket member (1) having a shaft fitting hole (1a) having a hole axis parallel to the axial direction at the rear end in the axial direction, and the shaft portion of the socket member (1). A shaft member (2) that is fitted and fixed in the fitting hole (1a) and extends rearward, and the fitting between the shaft portion fitting hole (1a) and the shaft member (2) is a tip. By changing at the rear end, the tightening allowance of the socket member (1) and the shaft member (2) after the fitting and fixing in the shaft portion fitting hole (1a) is changed to the shaft portion fitting hole (1a). The rotary tool socket is characterized in that it is set to be small at the rear end side and larger at the front end side and is fixedly fitted.

JP-A-6-226651 JP-A-9-248635 JP 2006-175523 A

  In any of the inventions disclosed in Patent Documents 1 to 3, the tool mounting shaft bar is press-fitted and fixed to the shaft bar insertion portion. For this reason, when it is mounted on an electric tool and a torque is applied, the torsional stress tends to concentrate, and the tool mounting shaft rod tends to hold heat.

  The present invention was made to solve these problems of the prior art, and even when the heat of the tool mounting shaft bar is transmitted to the socket body due to long-term use, the heat is easily dissipated, An object of the present invention is to provide a tool socket capable of preventing stress concentration.

  As a result of intensive studies to solve the above problems, the present inventors have obtained the following knowledge.

  (A) When the electric tool is used, heat generation of the motor, frictional heat at each part, etc. are generated. In particular, when used outdoors in summer, external factors such as solar heat and radiant heat are applied, and these heats are transmitted to the joint between the tool mounting shaft and the socket body. At this time, in the prior art socket in which the hard tool mounting shaft bar is press-fitted into the soft socket body, the tool mounting shaft bar and the socket body are in close contact with each other, so that heat is hardly dissipated. Usually, alloy steel with low hardness is used for the socket body, and alloy steel with high hardness is often used for the tool mounting shaft, but if the heat is trapped at the joint, the coefficient of thermal expansion of these materials will increase. Since they are different, unnecessary stress is applied and local cracks and breakage are likely to occur. Therefore, it is necessary for the joint portion between the tool mounting shaft and the socket body to be configured to easily dissipate heat.

  (B) Stress is likely to concentrate in a conventional socket in which the socket body and the tool mounting shaft are fixed. This is because the socket body and the tool mounting shaft are firmly fixed, so that the stress generated in the socket is difficult to disperse when the electric tool is used, and as a result, the same portion is repeatedly stressed. If tightening is performed with the axial direction of the screw and the axial direction of the socket matched, only the torsional stress needs to be considered, but in reality, the axial direction of the screw and the axial direction of the socket are different. In such a case, not only torsional stress but also impact force such as impact from a power tool or bending stress is applied to the joint. For this reason, it is necessary to make it the structure which the junction part of a tool attachment shaft bar and a socket main body does not adhere.

  (C) Based on the above knowledge, it is necessary to provide an appropriate space (play) at the joint between the tool mounting shaft and the socket body. In addition, the joint between the tool mounting shaft and the socket body needs to be inexpensive and easy to manufacture.

  This invention is made | formed based on said knowledge, and makes a summary the socket for tools shown to following (1)-(4).

(1) A socket body having a socket insertion portion for inserting a socket at one end and a tool attachment shaft rod at the other end, a tool attachment shaft having a socket body attachment portion at one end and a tool attachment portion at the other end A socket for a tool comprising a rod,
The shaft rod insertion part has a ring spring interior groove for interior of the ring spring, and the socket body mounting part has a ring spring exterior groove for exteriorizing the ring spring,
A tool socket in which a tool mounting shaft rod is attached to a shaft rod insertion portion via a ring spring fitted into a ring spring outer groove and a ring spring inner groove.

  (2) The tool socket according to (1), wherein the shaft rod insertion portion includes a bush having a ring spring interior groove.

  (3) The tool socket according to (2), wherein the outer peripheral surface of the bush is knurled.

  Note that the socket may adopt any shape of a hexagon socket and a twelve-angle socket.

  According to the present invention, even when the heat of the tool mounting shaft bar is transmitted to the socket, the heat can be easily dissipated and stress concentration can be prevented. Therefore, it is possible to provide a socket having a long tool life because the joint between the socket body and the tool mounting shaft rod is not easily damaged.

  Hereinafter, the tool socket according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded view illustrating a tool socket according to the present invention, FIG. 2 is a partial cross-sectional view illustrating a tool socket according to the present invention, and FIG. 3 is a joint portion of the tool socket according to the present invention. FIG. 4 is an enlarged partial cross-sectional view of an example of the joint portion of the tool socket according to the present invention.

  As shown in FIGS. 1-4, the tool socket 10 which concerns on this invention is comprised by the socket main body 20 and the tool attachment shaft 30, for example. For example, the socket main body 20 has a cylindrical shape as a whole, and has a socket 21 at one end and a shaft rod insertion portion 22 at the other end. For example, as shown in FIG. 3, the shaft rod insertion portion 22 includes, for example, a bush insertion portion 26, an inclined portion 27, a small diameter portion 28, and a shaft rod insertion port 29 from the socket 21 side.

  For example, the bush 24 is press-fitted into the bush insertion portion 26 from the socket side, and is fixed to the inner surface of the bush insertion portion 26 to become a part of the shaft rod insertion portion 22. A ring spring interior groove 25 is provided on the inner surface of the bush 24. For example, as shown in FIG. 4, a space portion (in FIG. 4) composed of the ring spring interior groove 25 of the bush 24 and the inclined portion 27 of the socket body. The ring spring 40 is fitted into a portion indicated by 50. This is also called a ring spring interior groove.

  As the bush 24, for example, a material harder than the socket body 20 and softer than the tool mounting shaft 30 is preferably used. For example, a material such as S45C may be used. As a result, troubles based on the hardness difference between the socket body 20 and the tool mounting shaft rod 30, for example, the intrusion of the high hardness tool mounting shaft rod 30 into the inner surface of the socket body 20, and the eccentricity or stress balance caused thereby. Can be resolved. When the bush 24 is attached, it is preferable to perform knurling on the outer surface of the bush. This is to prevent the bush 24 from falling off the socket body 20.

  However, the bush 24 can be omitted when it is desired to manufacture an inexpensive socket even if the above effects cannot be obtained and the life of the socket is somewhat reduced. In this case, it is necessary to provide the ring spring interior groove 50 on the inner surface of the socket body 20.

  For example, as shown in FIG. 2, there is a hollow portion 23 between the socket 21 and the shaft rod insertion portion 22, and the hollow portion 23 is formed by, for example, a rod screw when attaching or removing a nut. It becomes a retreat space.

Here, the outer diameter of the socket body 20 is, for example, the largest in the vicinity of the socket 21, and has a configuration that gradually decreases toward the shaft rod insertion portion 22. There is no restriction | limiting in particular in the diameter of the socket 21, It can be set as the socket diameter of about 12 mm-24 mm used normally. In FIG. 2, a 12-sided socket is shown, but a 6-sided socket may be adopted. The material of the socket is not specifically limited, H _RC 40 to 50 about the relatively soft alloy, for example, may be used aluminum, aluminum alloy, boron vanadium steel, chrome vanadium steel, chromium molybdenum steel .

On the other hand, for example, as shown in FIG. 1, the tool attachment shaft 30 includes a socket body attachment portion 31 at one end and a tool attachment portion 32 at the other end. The socket body mounting portion 31 includes, for example, a gradient portion 34, a ring spring exterior groove 35, and a small diameter cylindrical portion 36. The tool attachment portion 32 is provided with, for example, a locking groove 33, and is used for attaching an electric tool to a chuck (not shown). As the tool mounting shaft 30, a material usually used for a driver bit can be adopted. For example, a hard metal material H _RC of about 58 to 62, such as a nickel-chromium-molybdenum steel.

  As described above, in the tool socket 10 of the present invention, the shaft bar insertion portion 22 of the socket body 20 has the ring spring interior groove 50 for housing the ring spring 40, and the socket body of the tool mounting shaft 30. The mounting portion 31 has a ring spring outer groove 35 for mounting the ring spring 40, and the tool mounting shaft rod 30 is inserted from the shaft rod insertion portion 22 side of the socket body 20, and the tip thereof contacts the ring spring. When further inserted, the diameter of the ring spring 40 is gradually expanded by the gradient portion 34. Thereafter, when reaching the position of the ring spring exterior groove 35, the diameter of the ring spring 40 is reduced and the ring spring 40 is accommodated in the groove. For this reason, the ring spring 40 is held in a state of being fitted into a space formed by the ring spring exterior groove 35 and the ring spring interior groove 50. Thereby, the movement of the socket body 20 and the tool mounting shaft rod 30 in the axial direction is suppressed.

  Here, as a material of the ring spring 40, normal spring steel such as SWC80C can be used. However, when vibration during operation of the electric power tool is transmitted, the tool mounting shaft 30 may fall off. There is also concern about deterioration due to the occurrence of rust. Such a phenomenon is more likely to occur as the number of times of use increases, and greatly affects the life of the tool socket. Therefore, it is desirable to use a piano wire such as SWP-B as the material of the ring spring 40.

  Since the tool socket 10 of the present invention has such a configuration, for example, as shown in FIG. 4, an appropriate space is provided in each part of the portion where the socket body 20 and the tool mounting shaft 30 are in contact with each other. Can be secured. That is, the maximum diameter portion of the gradient portion 34 is substantially equal to the inner diameter of the bush 24, and a certain space is formed between the tip portion of the gradient portion 34 and the bush 24. Further, since the inner diameter of the small-diameter portion 28 of the socket body 20 is slightly larger than the outer diameter of the small-diameter cylindrical portion 36 of the tool mounting shaft 30, there is a space in this portion. Further, since the inner diameter of the shaft rod insertion port 29 of the socket body is slightly larger than the outer diameter of the body portion 37 of the tool mounting shaft rod 30, a space is also formed in this portion. Since there is such a space, the heat generated at the contact portion between the socket body 20 and the tool mounting shaft rod 30 can be dissipated with high efficiency. The main body 20 can rotate following the rotation of the tool mounting shaft 30 without any trouble. In addition, the presence of an appropriate space has an effect of preventing stress concentration.

  According to the present invention, even when the heat of the tool mounting shaft bar is transmitted to the socket, the heat can be easily dissipated and stress concentration can be prevented. Therefore, it is possible to provide a socket having a long tool life because the joint between the socket body and the tool mounting shaft rod is not easily damaged.

1 is an exploded view illustrating a tool socket according to the present invention. 1 is a partial cross-sectional view illustrating a tool socket according to the present invention; The exploded sectional view which expanded the example of the joined part of the socket for tools concerning the present invention The partial sectional view which expanded the example of the joined part of the socket for tools concerning the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tool socket 20 Socket body 21 Socket 22 Shaft bar insertion part 23 Hollow part 24 Bush 25 Ring spring interior groove 26 Bush insertion part 27 Inclined part 28 Small diameter part 29 Shaft bar insertion port 30 Tool mounting shaft bar 31 Socket body Mounting portion 32 Tool mounting portion 33 Locking groove 34 Gradient portion 35 Ring spring exterior groove 36 Small diameter cylindrical portion 40 Ring spring 50 Space portion (ring spring internal groove)

Claims (3)

A socket body having a socket at one end and a shaft insertion portion for inserting a tool attachment shaft at the other end, and a tool attachment shaft rod having a socket body attachment at one end and a tool attachment at the other. A tool socket comprising:
The shaft rod insertion part has a ring spring interior groove for interior of the ring spring, and the socket body mounting part has a ring spring exterior groove for exteriorizing the ring spring,
A tool socket, wherein the tool mounting shaft is attached to the socket body via a ring spring outer groove and a ring spring fitted in the ring spring inner groove.   The tool socket according to claim 1, wherein the shaft rod insertion portion includes a bush having a ring spring interior groove.   The tool socket according to claim 2, wherein the outer peripheral surface of the bush is knurled.

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