JPH0329107Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a bolt tightening tool for tightening shear bolts.

[Background of the invention] The structure of the tip of a conventional bolt tightening tool will be explained with reference to FIG. Reference numeral 1 designates a cylindrical outer socket, which is detachably connected via an outer socket holder 3 to an internal gear 2 of a planetary gear mechanism for decelerating a drive source (not shown). These internal gear 2, outer socket holder 3, and outer socket 1 rotate together. Reference numeral 4 denotes a cylindrical inner socket detachably connected to the planet gear support arm 5 of the planetary gear mechanism via an inner socket holder 6. These planet gear support arm 5, inner socket holder 6, and inner socket 4 rotate integrally. do. The inner socket 4 is hexagonally fitted into the inner socket holder 6, and the inner socket 4 can move forward and backward in the axial direction with respect to the inner socket holder 6, and is biased forward by a spring 7. A stopper 10 is screwed onto the outer socket holder 3, and the outer socket 1 is fixed to the outer socket holder 3 by the stopper 10.
The inner socket holder 6 has an extension part 6d extending forward in a part thereof, and the tip of the extension part 6d forms a contact surface 6a that restricts the inner socket 4 from retreating. The tip fitting part 4a at the tip of the inner socket 4 holds a stopper pin 8 whose tip protrudes into the inner surface of the tip fitting part 4a, the head 8a protrudes outside the tip fitting part 4a, and the head 8a is connected to the extension part. 6d is in contact with the contact surface 6a. Since the head 8a is in contact with the contact surface 6a, the inner socket 4
It regulates the regression of The stopper pin 8 is
The bolt tip is urged inwardly by a spring 11, and when the bolt tip is fully fitted into the tip fitting portion, the tip is pushed outward, thereby causing the head 8a to move outward and contact the contact surface 6a. contact is removed, and the inner socket 4 can be moved back.

Both sockets 1 and 4 are replaced by the user depending on the size of the bolt to be tightened. To attach the socket during replacement, first fit the inner socket 4 into the inner socket holder 6, and then attach the outer socket 1. When attaching the inner socket 4 to the inner socket holder 6, even if the inner socket 4 is fitted into the hexagonal part 6c of the inner socket holder 6, it will be pushed back forward by the spring 7 and will not fit into the hexagonal part 6c, or will not fit properly. However, the fit becomes shallow and the socket 4 is tilted with respect to the axial direction. Although the extension portion 6d provides support in one direction, it is insufficient. If an attempt is made to install the outer socket 1 in an inclined state, if the inner socket 4 is not fitted, the inner socket 4 will not move back, and the outer socket 1 will not be able to be installed in the correct position. Furthermore, torque transmission becomes impossible. If the fit is shallow and the inner socket 4 is tilted, the head 8a of the stopper pin 8 will not match the contact surface 6a of the inner socket holder 6, causing a problem when the head 8a slips inside the extension 6d. In order to prevent the above-mentioned problems when installing (replacing) the socket, the initial fitting length of the inner socket 4 and the hexagonal part 6c of the holder 6 (the state in which the inner socket 4 butts against the outer socket 1 without retreating) should be adjusted. It would be better to make it larger, but this increases the overall length of the tool, which has the disadvantage of severely restricting its use in narrow spaces.

[Purpose of the invention] The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional method and to make it possible to easily and reliably replace the socket.

[Embodiment of the invention] An embodiment of the invention will be described with reference to FIGS. 1 and 2.
In FIGS. 1 and 2, the same parts as in FIG. 3 are designated by the same reference numerals.

The present invention has a regulating piece 6 that extends in the axial direction along the outer circumference of the inner socket 4 on the inner socket holder 6.
This is characterized by the fact that b is provided protrudingly. The tip of the regulating piece 6b extends to the tip fitting part 4a at the tip of the inner socket 4, and is close to the tip fitting part 4a. In this embodiment, the regulating piece 6b is arranged at a position facing the extension part 6d. If the extension part 6d is not provided, a plurality of regulating pieces 6b are provided along the outer periphery of the chip fitting part 4a, or a plurality of regulating pieces 6b are provided along the outer periphery of the chip fitting part 4a.
may be formed into a cylindrical shape.

The present invention has the above configuration, and then the sockets 1 and 4 are
This section explains how to reinstall it after removing it. First, insert the inner socket 4 into the inner socket holder 6 with the hexagonal part aligned. During insertion, the inner socket 4 maintains its axial center by regulating the inclination of the outer periphery of the chip fitting portion 4a by the regulating piece 6b and the extension portion 6d. In this state, when the outer socket 1 is mounted and the stopper 10 is screwed onto the outer socket holder 3, the inner socket 4 is retracted until it is fitted into the hexagonal part of the inner socket holder 6 by the required amount, and the installation is completed.

[Effects of the invention] As described above, in the present invention, since the inner socket holder is provided with a regulating piece that restricts the inclination of the inner socket, the inner socket does not tilt when installing the socket during socket replacement, and the socket can be easily and securely installed. I can do it. Further, since the regulating piece can be arranged in the space between the outer socket and the inner socket, the size of the tool does not need to be increased.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the main parts of an embodiment of the present invention, and FIG. 2 is a perspective view of the inner socket holder of the present invention. FIG. 3 is a longitudinal sectional view showing a conventional structure. 1 is an outer socket, 2 is an internal gear, 3 is an outer socket holder, 4 is an inner socket, 4a is a chip fitting portion, 5 is a planetary gear support arm, 6 is an inner socket holder, and 6b is a regulating piece.

Claims (1)

[Scope of utility model registration request] A cylindrical outer socket removably connected to the internal gear of the planetary gear mechanism via an outer socket holder, and an inner socket holder arranged concentrically on the inner surface of the outer socket and attached to the planetary gear support arm of the planetary gear mechanism. In the bolt tightening machine, the bolt tightening machine includes an inner socket that is removably connected to the bolt through the bolt, and a spring that biases the inner socket forward. A bolt tightening tool characterized in that a regulating piece is provided that extends to the tip fitting portion of the inner socket and regulates the inclination of the inner socket.