JP2006305679A - Temporarily-fastening device for screw fastening tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temporarily-fastening device for a screw fastening tool, which temporarily-fastening device can quickly, simply, and surely carry out the temporary-fastening of a screw when the screw is fastened by means of a screw fastening tool, such as an impact wrench. <P>SOLUTION: An extension bar 11 is supported in a case 10 so as to move in the axial direction and so as to rotate, and a second one-way clutch 26 is arranged between them. A slider 20 is mounted on the extension bar 11 via a first one-way clutch 19, and a guide screw 25 fixed to the case 10 is inserted into the slider 20. When a bolt 3 held by the extension bar 11 is fitted into a screw hole 8 and the impact wrench 4 connected to the case 10 is pushed, the slider 20 rotates, and the bolt 3 is temporarily fastened by rotating the extension bar 11 via the first one-way clutch 19. After that, the impact wrench 4 is operated, and the bolt 3 is fastened by rotating the extension bar 11 via the second one-way clutch 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a temporary tightening device for a screw tightening tool for temporarily tightening a screw when tightening a screw such as a bolt or a nut using a screw tightening tool such as an impact wrench or a nut runner.

For example, as shown in FIG. 7, when the bolt 3 for attaching the oil pan 2 to the engine crankcase 1 is tightened by the impact wrench 4, generally, first, the extension bar 6 connected to the main shaft 5 of the impact wrench 4 is used. The head of the bolt 3 is fitted and held in the socket 7, the tip of the bolt 3 is applied to the screw hole 8 of the crankcase 1, and the operator manually turns the extension bar 6 to perform temporary tightening. In this manner, the impact wrench 4 is operated and tightened in a temporarily tightened state in which the tip of the bolt 3 is screwed into the screw hole 8 to some extent. Note that, for example, Patent Literature 1 describes tightening of a screw such as a bolt using a tightening tool such as an impact wrench.
Japanese Patent Laid-Open No. 8-47864

  At this time, as shown in FIG. 8, when the impact wrench 4 is operated in a state where screwing of the tip of the bolt 3 to the screw hole 8 is incomplete, the biting portion of the bolt 3 (the broken line portion in FIG. 8). ), The bolts 3 may not be tightened. In order to prevent the occurrence of such galling, the operator needs to turn the extension bar 6 sufficiently and securely perform temporary tightening, which is a burden on the operator. In particular, when a large number of bolts 3 are tightened, such as when the oil pan 2 is attached to the crankcase 1, the burden on the operator is large, which is a problem. In FIG. 8, the oil pan 2 is not shown.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a screw fastening tool temporary fastening device capable of quickly, simply and surely fastening a screw.

In order to solve the above-mentioned problem, a temporary fastening device for a screw fastening device according to the invention of claim 1 is movable in the axial direction with respect to a first shaft member coupled to a fastening tool and the first shaft member. And a second shaft member that is rotatably supported about the axis and that converts the axial movement of the first shaft member and the second shaft member into a rotational motion about the axis. Between the rotation conversion mechanism, the first one-way clutch that transmits only the rotation in the direction of tightening the screw generated by the linear motion-rotation conversion mechanism to the second shaft member, and between the first shaft member and the second shaft member And a second one-way clutch that transmits only the rotation in the direction in which the screw is tightened from the first member to the second member.
According to a second aspect of the present invention, there is provided the temporary tightening device for a screw tightening tool according to the first aspect, wherein the linear motion-rotation conversion mechanism includes a slider having a pair of pins arranged with a gap, and the pair of pairs. And a screw guide having a shape obtained by twisting a plate material inserted through the gap between the pins.
A temporary fastening device for a screw fastening tool according to a third aspect of the invention is characterized in that, in the configuration of the first or second aspect, a cover is rotatably provided on an outer peripheral portion of the first shaft member. To do.
According to a fourth aspect of the present invention, there is provided a temporary tightening device for a screw tightening tool according to the third aspect of the present invention, wherein a screw is tightened from the first member to the cover between the first shaft member and the cover. A third one-way clutch that transmits only the rotation in the reaction force direction is interposed.
According to a fifth aspect of the present invention, in the temporary tightening device for a screw tightening tool according to any one of the first to fourth aspects, the second one-way clutch can selectively transmit rotation in the direction of loosening the screw. It is characterized by having a locking mechanism.

  According to the temporary fastening device for a screw fastening device according to the present invention, when the screw attached to the second shaft member is applied to the screw hole and the second shaft member is moved to the first shaft member side, the linear motion-rotation conversion is performed. The mechanism rotates the second shaft member via the first one-way clutch and temporarily tightens the screw. Then, when the screw tightening device connected to the first shaft member is operated, the rotation of the first shaft member by the screw tightening device rotates the first shaft member via the second one-way clutch and tightens the screw. . In this way, the screws can be temporarily tightened quickly, easily and reliably.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 7 and 8 are denoted by the same reference numerals in the description.

  As shown in FIG. 1, a temporary fastening device 9 (screw fastening tool temporary fastening device) according to this embodiment is mounted on a main shaft 5 of an impact wrench 4 (screw fastening tool), for example, an engine crankcase. 1 is used for tightening a bolt 3 (screw) for attaching an oil pan 2 to 1.

  As shown in FIGS. 3 and 4, the temporary fastening device 9 includes a cylindrical case 10 (first shaft member) and a stepped cylindrical extension bar 11 (second shaft member) inserted into the case 10. ) And a cylindrical cover 12 covering the case 10. In the case 10, an inner diameter of one end portion is reduced to form a clutch mounting portion 13, and a connecting block 14 is fitted to the other end portion and fixed by a screw 15. A rectangular connection recess 16 for connecting the main shaft 5 of the impact wrench 4 is formed at the outer end of the connection block 14.

  The extension bar 11 is formed with a large-diameter sliding portion 17 at the base end portion and a rectangular connecting convex portion 18 for connecting the socket 7 to the distal end portion. The extension bar 11 is inserted into the clutch mounting portion 13 of the case 10, the sliding portion 17 is slidably fitted into the case 10, and is supported so as to be movable and rotatable in the axial direction with respect to the case 10. ing.

  A cylindrical first one-way clutch 19 is press-fitted and fitted in the sliding portion 17, and a cylindrical slider 20 is fitted in the first one-way clutch 19. The slider 20 is fixed in the axial direction by a snap ring 21 and a spacer 22 attached to the inner peripheral portion of the opening end of the sliding portion 17 and is prevented from coming off. A pair of sliding pins 23 (pins) arranged in parallel with a predetermined gap C (see FIG. 3) across the diameter of the slider 20 are fixed.

  One end of the slider 20 is fixed to the connecting block 14 by a bolt 24 and a guide screw 25 extending along the axis of the case 10 is inserted. The guide screw 25 is formed by twisting a plate material into a screw shape, and is slidably inserted into the gap C between the pair of sliding pins 23 of the slider 20. Thus, a linear motion-rotation conversion mechanism that converts linear motion into rotational motion is configured by the slider 20 and the guide screw 25, and the slider 20 moves on the guide screw 25 along the axial direction as shown in FIG. When moved, the slide pin 23 is guided along the screw-shaped surface of the guide screw 25, and the slider 20 rotates about the axis. Here, when the extension bar 11 moves from the extended position shown in FIG. 4 (A) to the shortened position shown in FIG. 4 (B), the slider 20 turns clockwise (clockwise as viewed from the connecting block 14 side, that is, bolts). When the slider 20 rotates from the shortened position to the extended position, the slider 20 rotates counterclockwise (counterclockwise when viewed from the connecting block 14 side, that is, the direction in which the bolt 3 is loosened, and so on). The twist direction of the guide screw 25 is set so that the guide screw 25 rotates.

  Since the guide screw 25 has a twisted plate material, it can be manufactured at a very low cost. Moreover, you may make it reduce resistance force using the roller which can rotate instead of the sliding pin 23. FIG.

  When the slider 20 rotates clockwise with respect to the sliding portion 17, the first one-way clutch 19 enters a coupled state and rotates the sliding portion 17 integrally with the slider 20. When rotating counterclockwise with respect to 17, the slider 20 is released so that the slider 20 rotates idly with respect to the sliding portion 17.

  A cylindrical second one-way clutch 26 is press-fitted and fitted into the clutch mounting portion 13 of the case 10, and the extension bar 11 is fitted into the second one-way clutch 26. When the extension bar 11 rotates clockwise with respect to the case 10, the second one-way clutch 26 is in a released state so that the extension bar 11 rotates idly with respect to the case 10 and is movable in the axial direction. When the extension bar 11 rotates counterclockwise with respect to the case 10, the case 10 is brought into a coupled state and the case 10 is rotated integrally with the extension bar 11.

  As the first one-way clutch 19 and the second one-way clutch 26, for example, an outer ring having a plurality of cam surfaces on the inner peripheral surface, a plurality of rollers inserted into the cam surface of the outer ring, and a roller inside the cam surface are combined. For the rotation of the shaft inserted through the outer ring to one side, the roller moves away from the cam surface while compressing the spring, and the shaft moves in the axial direction. In addition, for the rotation of the shaft to the other side, the roller is moved to the meshing position with the cam surface by the action of the spring, and the shaft is prevented from rotating by the wedge action. Although other structures may be used.

  A return spring 27 (compression coil spring) is inserted inside the extension bar 11, one end of the return spring 27 abuts on the inner surface of the tip of the extension bar 11, and the other end is the extension bar 11. The end of the guide screw 25 inserted into the guide screw 25 is in contact with each other via a spring receiver 28. The extension bar 11 is constantly urged toward the extended position shown in FIG. 4A by the spring force of the return spring 27. In the illustrated example, the return spring 27 is two coil springs arranged in series via the intermediate spring support 29, but may be a single spring.

  The cover 12 is rotatably fitted to the outer peripheral portion of the case 10, and the inner flange portion 30 formed at one end abuts against the shoulder portion of the connecting block 14 and is prevented from being detached by the snap ring 31. .

The operation of the present embodiment configured as described above will be described next.
As shown in FIG. 1, the temporary fastening device 9 includes a connecting convex portion formed on the connecting block 14 of the case 10 and the connecting recess 16 connecting the main shaft 5 of the impact wrench 4 and the extension bar 11. A socket 7 is attached to 18 and used.

A process of fastening the bolt 3 for attaching the oil pan 2 to the crankcase 1 by the impact wrench 4 using the temporary fastening device 9 will be described with reference to FIG.
As shown in FIG. 5A, the bolt 3 is fitted and held in the socket 7 connected to the extension bar 11. As shown in FIG. 5B, the tip of the bolt 3 is applied to the screw hole 8 of the crankcase 1.

As shown in FIG. 5C, when the impact wrench 4 and the cover 12 are gripped and pressed toward the bolt 3 side, the extension bar 11 is shortened against the spring force of the return spring 27, and the sliding portion 17 is moved. Slide in the case 10. Thereby, the slide pin 23 of the slider 20 slides along the surface of the guide screw 25, and the slider 20 rotates clockwise. When the slider 20 rotates clockwise, the first one-way clutch 19 is engaged, and the extension bar 11 rotates integrally with the slider 20 clockwise. At this time, the second one-way clutch 26 is disengaged with respect to the clockwise rotation of the extension bar 11, so that the extension bar 11 can rotate clockwise without rotating the case 10. The bolt 3 is screwed into the screw hole 8 by the clockwise rotation of the extension bar 11. At this time, the rotation of the case 10 is prevented by the rotational resistance of the main shaft 5 of the impact wrench 4 against the reaction force from the bolt 3.

  As shown in FIG. 5D, the bolt 3 can be sufficiently screwed into the screw hole 8 by pushing the extension bar 11 to the shortened position (see FIG. 4B), and the temporary tightening is surely performed. Can do. Thereafter, as shown in FIG. 5E, when the impact wrench 4 is operated, the case 10 rotates clockwise together with the main shaft 5. When the case 10 rotates clockwise, the second one-way clutch 26 is in a coupled state, so that the extension bar 11 rotates clockwise together with the case 10 to tighten the bolt 3. At this time, the cover 12 is rotatably supported by the case 10 and does not rotate even when the case 10 rotates. Therefore, the operator can hold the cover 12 and operate the impact wrench 4.

  When the socket 7 is pulled away from the bolt 3 after the tightening of the bolt 3 is completed, the extension bar 11 is returned to the extended position (see FIG. 4A) by the spring force of the return spring 27. At this time, the slider 20 moves toward the extended position on the guide screw 25 and rotates counterclockwise. However, the first one-way clutch 19 is released and the extension bar 11 does not rotate. . Thereby, since the 2nd one-way clutch 26 will be in a released state, the extension bar 11 can return to an extended position smoothly.

  In this manner, the bolt 3 can be fastened easily and reliably in the screw hole 8 and then tightened by the impact wrench 4. At this time, as described above, the extension bar 11 does not rotate when returning from the shortened position to the extended position. Therefore, if the temporary tightening is insufficient, the impact wrench 4 and the cover 12 are moved to the bolt 3 side. By repeatedly pressing the bolt 3, the bolt 3 can be further screwed into the screw hole 8.

  In the above embodiment, the sliding pin 23 and the guide screw 25 convert the axial movement (linear movement) of the slider 20 into rotational movement. However, the engagement between the spiral groove and the pin, the ball- It is also possible to change the axial motion of the slider 20 to a rotational motion using another linear motion-rotation conversion mechanism such as a screw mechanism.

  Moreover, in the said embodiment, when the rotational resistance force of the main shaft 5 of the impact wrench 4 is not sufficient with respect to the reaction force from the bolt 3 at the time of temporary fastening, as shown in FIG. The third one-way clutch 32 is interposed between the connecting block 14 and the cover 12, and the counterclockwise rotational force of the case 10 due to the reaction force of the bolt 3 temporarily tightened is transmitted to the cover 12. The reaction force from the bolt 3 at the time of fastening can be supported by the cover 12, and temporary fastening can be performed efficiently.

  Furthermore, in the above-described embodiment, the second one-way clutch 26 is provided with a lock mechanism that selectively enables transmission of rotation in the direction in which the bolt 3 is loosened, and this lock mechanism is operated to move the main shaft 5 of the impact wrench 4. It is also possible to loosen the tightened bolt 3 with the impact wrench 4 by reverse rotation (rotation counterclockwise).

The axial direction longitudinal cross-sectional view which shows the use condition of the temporary fastening apparatus for screw fastening tools which concerns on one Embodiment of this invention comes out. It is explanatory drawing which shows schematic structure of the linear motion-rotation conversion mechanism of the temporary fastening apparatus for screw fastening tools shown in FIG. It is a longitudinal cross-sectional view of the direction orthogonal to the axis | shaft of the sliding part of the extension bar of the temporary fastening apparatus for screw fastening tools shown in FIG. FIG. 2 is an axial longitudinal sectional view showing a state in which an extension bar is in an extended position and a shortened position in the temporary fastening device for a screw fastening tool shown in FIG. 1. It is a figure which shows the process of fastening a volt | bolt using the temporary fastening apparatus for screw fastening tools shown in FIG. It is an axial direction longitudinal cross-sectional view which shows the principal part of other embodiment of the temporary fastening apparatus for screw fastening tools shown in FIG. It is explanatory drawing which shows the conventional temporary fastening process at the time of fastening a volt | bolt using an impact wrench. It is an axial direction longitudinal cross-sectional view which shows the biting part to the screw hole of the bolt bolted temporarily.

Explanation of symbols

3 bolt (screw), 9 temporary fastening device (temporary fastening device for screw tightening tool), 10 case (first shaft member), 11 extension bar (second shaft member), 19 first one-way clutch, 20 slider (straight) Motion-rotation conversion mechanism), 25 guide screw (linear motion-rotation conversion mechanism), 26 second one-way clutch

Claims (5)

A first shaft member coupled to a tightening tool; a second shaft member supported by the first shaft member so as to be movable in the axial direction and rotatable about the axis; and for tightening a screw; and the first shaft member A linear motion-rotation conversion mechanism that converts axial movement of the shaft and the second shaft member into rotational motion about the axis, and only rotation in the direction in which the screw generated by the linear motion-rotation conversion mechanism is tightened is the second shaft. The first one-way clutch that transmits to the member and the first shaft member and the second shaft member are interposed between the first one-way clutch and the second member to transmit only the rotation in the direction in which the screw is tightened. A temporary fastening device for a screw fastening tool, comprising: a second one-way clutch. The linear motion-rotation conversion mechanism includes a slider having a pair of pins arranged with a gap, and a screw guide having a shape in which a plate member inserted through the gap between the pair of pins is twisted. Item 10. A temporary fastening device for a screw fastening tool according to Item 1. The temporary fastening device for a screw fastening tool according to claim 1 or 2, wherein a cover is rotatably provided on an outer peripheral portion of the first shaft member. A third one-way clutch is interposed between the first shaft member and the cover to transmit only rotation in a reaction direction of screw tightening from the first member to the cover. Item 4. A temporary fastening device for a screw fastening tool according to Item 3. The temporary tightening tool for a screw tightening tool according to any one of claims 1 to 4, wherein the second one-way clutch includes a lock mechanism that selectively enables transmission of rotation in a direction in which the screw is loosened. Fastening device.

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