JP2007301658A - Connecting tool, and impact wrench using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting tool, such as a torsion bar to be attached to an impact wrench etc. in order to carry out an operation for fastening or loosening an object to be fastened, which connecting tool can easily cause an appropriate torsion. <P>SOLUTION: In the torsion bar 10, an intermediate shaft 11 provided between a fixing portion 5 to be attached to an anvil 2 and a socket portion 6 to be fitted on a bolt 3 is composed of a flat plate having a width W narrower than the diameters of the fixing portion 5 and the socket portion 6. The intermediate shaft 11 composed of the flat plate can be twisted at the same level as that of a shaft having a circular cross sectional shape by a load of several tens percent of the load for the circular cross section shaft. Therefore, if the intermediate shaft 11 is designed so as to be fit for various usage patterns, various usage circumstances, the control of torsion and torque equivalent to that for the torsion bar having the circular cross sectional shape can be carried out even if the length of the torsion bar is short. As a result, the torsion bar can be easily manipulated, and its convenience, operability, etc. can be made excellent. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connecting tool that can be attached to and detached from a rotating shaft of a tool such as an impact wrench and is used for tightening an object to be tightened such as a nut, and an impact wrench using the same.

  The impact wrench is a device that performs screw tightening or the like with a striking force, and is widely used for tightening and removing bolts or nuts in assembly of automobiles and general industrial equipment, maintenance of automobiles, and the like. FIG. 12 shows an example of such an impact wrench. In the figure, 1 is a wrench body, 2 is an anvil at the tip of a rotary drive shaft, 3 is a bolt as a tightening object, and 4 is a torsion bar.

  By the way, although torque control is difficult with a normal impact wrench, there is a tool that adjusts the output by using torsion to make it possible. For example, when using an impact torsion bar socket (manufactured by Yamashita Industrial Laboratory Co., Ltd.), the size and tightening torque can be changed by simply replacing the torsion bar even if the input on the impact side is constant.

In the example of FIG. 11, the impact torsion bar is between the fitting portion 5 attached to the anvil 2 that is the output shaft of the wrench body 1 and the socket portion 6 that is fitted to the bolt 3 that is the tightening target, that is, in the middle. The shaft 7 is intended to reduce the impact of the impact wrench as much as possible and to adjust the impact transmitted to the tip side of the torsion bar 4. Such a torsion bar can suppress an instantaneous excessive output, which is a drawback of an impact wrench, and not only an object to be tightened such as a bolt and a nut, but also an impact applied to a socket provided on the torsion bar itself or attached separately. You can relieve power.
JP 2003-170366 A JP-A-9-136267 JP 2003-205473 A

  However, most of the connecting tools such as the torsion bar described above are composed of a solid round bar in consideration of strength and the like, and the twist is used. Although the purpose is to adjust the output, in reality, the middle shaft part is not lengthened or the twist does not occur as much as I thought that the shaft diameter should not be reduced, and this point should be improved. It was.

  In order to solve such a conventional problem, the present invention can be easily applied to a connecting tool such as a torsion bar that is attached to the tip of a rotary shaft of a tool and performs an operation of tightening or loosening an object to be tightened. It is an object of the present invention to provide a connecting tool capable of generating a torsion and an impact wrench using the connecting tool.

  A connecting tool according to the present invention is a connecting tool for performing an operation of tightening or loosening an object to be tightened and attached to a tip of a rotary shaft of the tool in order to achieve the above-described object, And the portion to be directly attached to the object to be tightened has a plate shape thinner than the tip of the rotating shaft and the part to be attached to the object to be tightened, or the tip of the rotating shaft and the object to be tightened A prismatic shape that is thinner than the part attached to the object. Whether it has a plate shape or a prismatic cross-sectional shape, it is possible to generate a twist with a small force as compared with a round and solid conventional connecting tool, and the torque control due to the occurrence of the twist described above is easy. Become.

  In the case of a plate-like shape or a prismatic shape, the connecting portion has a tapered shape with a thick tip end on the rotating shaft and a thin attachment portion on the tightening object, thereby making it easier to twist. be able to. Although it is necessary to take various considerations so that the degree of taper does not break due to applied torque, torque control by generation of twist becomes easier than that of non-tapered ones.

  In addition, by attaching a coil spring or cylinder to the outer periphery of the connecting part so that the operator can grasp the part by hand, it can be easily handled in places where it is difficult to work, In the unlikely event that the intermediate shaft is damaged, it is possible to ensure the safety of the operator. Such a connecting tool can of course be used as an impact socket of an impact wrench.

  The present invention can be used as a torsion bar or the like as a torsion bar that is attached to the tip of a rotating shaft of a tool and performs an operation of tightening or loosening an object to be tightened. Can easily occur. This also makes it very suitable for use with an impact wrench.

  The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings. In the following description, parts common to the conventional example are denoted by common reference numerals.

  FIG. 1 is a perspective view showing a configuration of a first embodiment of an impact wrench using a connecting tool according to the present invention as a torsion bar, and FIG. 2 is a partially cutaway side view of a torsion bar portion. The torsion bar 10 according to this embodiment includes an intermediate shaft 11 between the fitting portion 5 attached to the anvil 2 and the socket portion 6 fitted to the bolt 3, as shown in FIG. It is comprised with the flat plate material (refer AA cross section) whose width W is narrower than the diameter of this.

  The specifications of the intermediate shaft 11 made of a flat plate material have various usage forms, so it is necessary to design and determine them according to the usage environment. However, if the length L is too long, the torque is transmitted. In other words, the torsion bar 10 as a whole is shaken, and problems such as inability to transmit torque properly and the removal of the socket portion 6 from the bolt 3 are considered dangerous. Also, the thickness t of the intermediate shaft 11 needs to be designed and determined according to the use environment. A specific example of this embodiment will be described later.

  FIG. 3 is a perspective view showing a second embodiment of the connecting tool according to the present invention. This embodiment can also be used as a torsion bar of an impact wrench. The torsion bar 20 has a structure in which an intermediate shaft 21 between the fitting portion 5 and the socket portion 6 is fitted to the fitting portion 5 as shown in the figure. And a flat plate material tapered such that the maximum width W1 is narrower than the diameter of the socket portion 6 and the width becomes narrower from the fitting portion 5 side toward the socket portion 6 side (maximum width W1, minimum width W2). BB, CC section reference).

  The specifications of the intermediate shaft 21 made of a tapered flat plate material also have various usage forms. Therefore, it is necessary to design and determine according to the usage environment. Thus, problems such as inability to properly transmit torque and removal of the socket portion 6 from the bolt 3 may occur. The same applies to the thickness t. A specific example of this embodiment will also be described later.

  FIG. 4 is a perspective view showing a third embodiment of a connecting tool according to the present invention. This embodiment can also be used as a torsion bar of an impact wrench. The torsion bar 30 has a configuration in which an intermediate shaft 31 between the fitting portion 5 and the socket portion 6 is fitted to the fitting portion 5 as shown in the figure. And it is comprised from the member of the square pillar shape whose diameter is smaller than the diameter of the socket part 6. FIG. In the embodiment shown in the figure, the four corners in the longitudinal direction of the intermediate shaft 31 are chamfered so as to have a deformed octagonal columnar shape. In this way, chamfering is not essential. Further, the cross-sectional shape of the prism is not limited to a quadrangular prism, and may be any polygonal shape that is not less than a triangular prism or pentagonal prism, and the cross-section is not so circular.

  As with the previous embodiment, the specifications of the intermediate shaft 31 may be designed and determined according to the use form and the use environment. However, if the length is too long, the torque cannot be transmitted properly due to undulations. Problems such as the socket part 6 coming off from the bolt 3 may occur. A specific example of this embodiment will also be described later.

  FIG. 5 is a perspective view showing a modified embodiment of the first embodiment shown in FIG. That is, the torsion bar 40 of the fourth embodiment is configured by mounting the coil spring 41 on the outer periphery of the flat intermediate shaft 11 in addition to the same configuration as the torsion bar 10 of the first embodiment.

  Regarding the specifications of the intermediate shaft 41, not only the portion of the intermediate shaft 11 but also the coil spring 41 needs to be designed and determined according to the use form and the use environment in consideration of the twist and the return thereof. . If designed appropriately, the torque of the impact wrench can be controlled by twisting the flat intermediate shaft 11. In the unlikely event that the intermediate shaft 11 is damaged, the coil spring 41 covers the outer periphery of the intermediate shaft 11, so that the safety of the operator can be ensured.

  FIG. 6 is a perspective view showing a modified embodiment of the first embodiment shown in FIG. That is, the torsion bar 50 of the fifth embodiment is configured by mounting the cylinder 51 on the outer periphery of the flat plate-like intermediate shaft 11 in addition to the same configuration as the torsion bar 10 of the first embodiment. In order not to come off from the bolt 3, the operator can easily grip it, and is particularly suitable for work in a portion where it is difficult to work. Even if the cylinder 51 is fixed to the fitting portion 5 and the socket portion 6, a function superior to that of the conventional solid torsion bar can be exhibited. However, the worker only needs to cover the outer periphery of the intermediate shaft 11. It may be a part that only assists in gripping. In the unlikely event that the intermediate shaft 11 is damaged, the cylinder 51 covers the outer periphery of the intermediate shaft 11, so that the safety of the operator can be ensured.

  FIG. 7 is a perspective view showing an embodiment in which the intermediate shafts 11, 21, and 31 can be attached to and detached from the fitting portion 5 and the socket portion 6 in the torsion bar of the first to third embodiments described above. FIG. 8 is a partial sectional view of the present embodiment regarding the torsion bar of the first embodiment.

  In this embodiment, the fitting portions 5a and 21a, 31a to the fitting portion 5 and the socket portion 6 are formed thicker than the intermediate shafts 11, 21, 31 at both ends of the intermediate shafts 11, 21, 31 respectively. The fitting portion 5 and the socket portion 6 are formed with mounting holes 5a and 6a for receiving them, and an annular groove 61 for mounting the O-ring 60 is formed. Further, as a structure for preventing the removal, a pin hole 63 for inserting the pin 62 is formed in each part. The pin holes 63 penetrate through the formed portions. Then, after assembling both ends of the intermediate shafts 11, 21, 31 to the fitting part 5 or the socket part 6 together with the O-ring 60, the pin 62 is inserted from the pin hole 63 of the O-ring 60 to the fitting part 5 or the socket part 6. Then, it passes through the attachment part 11a, 21a or 31a, and also the fitting part 5 or the socket part 6, and is inserted so as to reach the pin hole 63 on the opposite side of the O-ring 60 to prevent it from coming off.

  FIG. 9 is a perspective view of an embodiment in which the structure of the sixth embodiment described above is adopted in the embodiment shown in FIG. Since the configuration of each part is a combination of the above-described two embodiments, the description thereof will be omitted, and the same reference numerals will be given to the same parts.

  FIG. 10 is a perspective view of an embodiment in which the structure of the sixth embodiment described above is adopted in the embodiment shown in FIG. Also in this embodiment, since the configuration of each part is a combination of the above-described two embodiments, the description thereof will be omitted, and the same reference numerals will be given to the same portions.

  FIG. 11 is a table showing the results of an example in which test pieces were prepared with three types of cross-sectional shapes of the intermediate shaft, round, square, and rectangular (substantially the same cross-sectional area and the same length), and a comparison regarding torsion was performed. FIG.

  As is apparent from the figure, the case of the square is 82.9% and the case of the rectangle is twisted to the same extent by a load of about 64.8% than the case of the round cross-sectional shape. In other words, if the cross-sectional shape of the intermediate shaft is a square and further a rectangle, a desired twist can be generated with a load reduced by about 80 to 65%. Of course, it goes without saying that the above numbers change depending on the shape. However, in any case, if the same load is applied to the object to be tightened by the impact wrench, an intermediate shaft having a square or rectangular cross section whose length is several tens of percent shorter than the circular intermediate shaft is used. I can say that. When using with tools such as impact wrench, although it depends on the usage situation, it is clear that in general, the shorter the intermediate shaft, the better the handling and operability. It is a great advantage to make the square or rectangular.

  In addition, in the case where the taper is provided, it is clear from the viewpoint of material mechanics that the same degree of torsion can be generated with a load smaller than that of the non-tapered shape, and thus description thereof is omitted.

The perspective view which shows the structure of 1st Example of the impact wrench which used the connection tool which concerns on this invention as a torsion bar. Side cutaway view of torsion bar The perspective view which shows 2nd Example of the tool for connection which concerns on this invention. The perspective view which shows 3 Example of the tool for connection which concerns on this invention The perspective view which shows the modification Example (Example 4) of 1st Example shown in FIG. The perspective view which shows the modified Example (Example 5) of 1st Example shown in FIG. The perspective view which shows 6th Example of the tool for connection which concerns on this invention. Partial sectional view of the same 5 is a perspective view of an embodiment (Embodiment 7) in which the structure of the above-described sixth embodiment is adopted in the embodiment shown in FIG. 6 is a perspective view of an embodiment (Embodiment 8) that adopts the structure of the sixth embodiment described above in the embodiment shown in FIG. As Example 9 of this invention, the figure which shows the result of the example which performed the comparison regarding the twist of the test piece which made the cross-sectional shape of the intermediate shaft round, square, and rectangular three types Perspective view showing a conventional impact wrench

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wrench main body 2 Anvil at the front-end | tip of a rotational drive shaft 3 Bolt which is a clamp | tightening object 5 Fitting part 6 Socket part 5a, 6a Mounting hole 10, 20, 30, 40, 50 Torsion bar 11, 21, 31 Intermediate shaft 11a, 21a , 31a Mounting part 41 Coil spring 51 Cylinder 60 O-ring 61 Annular groove 62 Pin 63 Pin hole

Claims (6)

A connecting tool for attaching to a rotating shaft tip of a tool and performing an operation of tightening or loosening an object to be fastened, wherein a connecting portion between a portion directly attached to the rotating shaft tip and the fastening object is the rotating shaft. A connecting tool characterized in that the connecting tool has a plate shape thinner than a tip and an attachment portion to the fastening object. A connecting tool for attaching to a tip of a rotating shaft of a tool and performing an operation of tightening or loosening an object to be tightened, wherein a connecting portion between a portion directly attached to the tip of the rotating shaft and the object to be tightened is A connecting tool characterized in that it is in the shape of a prism that is narrower than the tip of the rotating shaft and the portion attached to the object to be tightened. 3. The connection tool according to claim 1, wherein the connection portion has a tapered shape in which a tip end side of the rotating shaft is thick and a portion to be attached to the tightening target is thin. The connection tool according to any one of claims 1 to 3, wherein a coil spring is mounted on an outer periphery of the connection part. The connection tool according to any one of claims 1 to 3, wherein a cylinder is attached to an outer periphery of the connection part. An impact wrench characterized in that the connecting tool according to any one of claims 1 to 5 is used as an impact socket.

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