JPS63200973A - Attachment fixture for impact tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to an attachment mounting device for an impact tool for mounting an attachment such as a socket for tightening bolts and nuts or a driver bit for tightening screws on an output section called an anvil to which a rotational impact is applied.

[Background technology]

The anvil of an impact tool is usually manufactured in 1987-955.
As seen in Publication No. 99, etc., the square hole 20 has a rectangular cross section and is provided at the rear end of the socket 2 for tightening bolts and nuts as shown in FIGS. 12 and 13.
The socket 2 is attached by inserting the tip of the anvil 1 into the socket. In order to be able to attach a screwdriver bit 3 for screw tightening to this product, since the driver bit 3 is generally formed with a hexagonal cross section, as shown in Figs. 14 and 15, A socket 4 with a bit holder is prepared, and a screwdriver bit 3 is attached via this socket 4 with a bit holder. However, compared to when the driver bit 3 is attached directly to the anvil 1, the presence of the socket 4 with a bit holder increases the wobbling and center runout of the driver bit 3, making it difficult to tighten screws. Sometimes it was difficult. As shown in FIG. 16, a shaft portion 22 having a hexagonal cross section similar to that of the driver bit 3 is provided at the rear end of the socket 2 for tightening bolts and nuts, and the shaft portion 22 of the driver bit 3 and the socket 2 is attached to the anvil 1. It has also been attempted to form a bit holder 10 in which the part 22 is detachable.
In this case, since both attachments are attached directly to the anvil 1, problems related to backlash and core runout are eliminated, but there are limitations regarding the torque transmission force at the connection between the anvil 1 and the attachment and the shaft 22 of the socket 2. This poses a problem in that sockets 2 for tightening large diameter bolts and nuts, which are thick and require a large torque when tightening, cannot be used.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to enable any attachment to be directly attached to the anvil, thereby increasing rattling and center runout. An object of the present invention is to provide an attachment mounting device for an impact engineer capable of transmitting a large torque to a socket for tightening bolts and nuts. In an attachment mounting device that detachably attaches two types of attachments, a socket and a driver bit, to an anvil to which rotational impact is applied, the socket mounting part is provided on the outer periphery of the anvil, and the driver bit mounting part is provided inside the anvil. The present invention will be described below in detail based on the illustrated embodiments.
6 to 6 show an embodiment of the present invention,
The outer surface of the tip of the anvil 1, which is the output portion of the impact wrench, has a square cross section, and a hexagonal hole 13 opening at the tip surface of the anvil 1 is formed inside. The tip of the anvil 1 is provided with a through hole 14 that radially passes through the center of the opposite side of its outer surface, and a substantially conical hole 16 is provided in a portion separated by a flange 15 at the rear thereof. , a ball 17 is arranged. A part of the screwdriver bit mounting portion 12 is made to protrude into the hexagonal hole 13 and connected to the hexagonal hole 13.
As is clear from Figure @2, the balls 17 that make up the
The anvil 1 is biased toward the center by a leaf spring 18 surrounding the outer periphery of the anvil 1. The socket 2 is equipped with a square hole 20 on the rear end surface and a round socket portion 21 on the front end surface, and is provided with an annular groove 24 on the outer surface of the rear end, and a mounting hole passing through the bottom of the groove 24. 25, and attachment to the anvil 1 is performed on the outer surface of the tip of the anvil 1. That is, as shown in FIG. 5, the socket attachment part 11 at the tip of the anvil 1, which has a rectangular outer shape and a through hole 14 formed therein, is inserted into the square hole 20 of the socket 2. Insert the pin 5 into the mounting hole 25 of the anvil l and the through hole 14 of the anvil l,
The socket 2 is attached by covering the groove 24 of the socket 2 with a retaining ring 26 to prevent the pin 5 from being removed. The driver and cutter 3, which has a hexagonal cross section and an annular groove 31 formed on the outer peripheral surface of the rear end, is installed in the sixth step.
As shown in the figure, the driver bit 3 is inserted into the hexagonal hole 13 in the anvil 1, and the ball 17, which is biased by the leaf spring 18, is inserted into the groove of the driver bit 3.
Since the length of the connecting portion between the driver bit 3 and the anvil 1, which is achieved by locking the driver bit 3 to the anvil 1, is long, the rattling and center runout of the driver bit 3 are extremely reduced. Another embodiment is shown in FIGS. 7 to 11, in which both the locking of the socket 2 and the locking of the driver bit 3 are performed by the pin 5.
This pin 5, both ends of which are hemispherical, slides in the annular direction into a pair of through holes 14 and 14 that connect the outer surface of the anvil 1, which has a square cross section, and the hexagonal hole 13. It is movably disposed and is biased toward the center in the radial direction by a leaf spring 18 surrounding the outer surface of the anvil 1. As shown in FIG. The plate spring 19 is biased radially outward by both side pieces of the leaf spring 19 press-fitted into the plate spring 19 . As shown in Figure 10, insert the tip of the anvil 1 into the socket 2.
When inserted into the square hole 20 of the socket 2, one end of each pin 5 is locked in the mounting hole 25 of the socket 2 by the urging force of the leaf spring 19, and the 11th
As shown in the figure, when the driver bit 3 is inserted into the hexagonal hole 13, the other end of the pin 5 is pushed into the groove by the urging force of the leaf spring 18.
Lock at 1. Since the driver bit attachment part 12 and the socket attachment part 11 are formed inside and outside the tip of the anvil 1, it is possible to lock both the socket 2 and the driver bit 3 with only the pin 5. In addition, it is easy to attach and detach both attachments. Note that the pin 5 may be replaced by a member such as a ball depending on the related dimensions. [Effects of the Invention] As described above, in the present invention, the socket is attached to the outer surface of the anvil, and the driver bit is attached to the inside of the anvil, and since both the socket and driver bit are attached directly to the anvil, they are separately attached. There is no increase in rattling or core runout caused by intervening parts, and since the socket is attached to the outer surface of the anvil, the torque transmission force to the socket is reduced and only small-diameter bolts and nuts can be tightened. This will not lead to a situation where there is no such thing.

[Brief explanation of the drawing]

tJS1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a cross-sectional view of the same, FIG. 3 is an exploded perspective view of the same, FIG. 4 is a rear view of the socket of the same, and FIG. 5 is the same as the above. Figure 6 is a vertical cross-sectional view when installing the socket, Figure 6 is a vertical cross-sectional view when installing the same driver bit, Figure 7 is a vertical cross-sectional view of another embodiment, Figure 8 is a cross-sectional view of the same as above, and Figure MS9 is the same as above. Perspective view of the plate bone, No. 10
Figure 11 is a vertical cross-sectional view of the same socket when installed, Figure 11 is a vertical cross-sectional view of the same driver bit installed, Figure 12 is a cutaway side view of the conventional socket installed, and Figure MS13 is the front view of the same socket. Figures 14 and 14 are broken side views of the same screwdriver bit installed, Figures W & 15 are front views of the external socket with bit holder attached to the above, and Figure 16 is a broken side view of another conventional example, where 1 is an anvil. , 2 is a socket, 3 is a driver bit, 11 is a socket attachment part, and 12 is a driver bit attachment part. Agent Patent attorney Ishi 1) Chief 71 Anvil 2 Bucket 3 Driver bit Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 10 Figure 12 Figure 13 Procedure amendment Patent Application No. 31774, dated May 26, 1986, 2, Title of the invention: Attachment mounting device for impact tools 3, Relationship to the person making the amendment case Patent applicant address: 1048 Kadoma, Kadoma City, Osaka Prefecture Name (58
3) Matsushita Electric Works Co., Ltd. Representative Sadao Fujii 4 Agent postal code 530 Address 1-12817-5 Umeda, Kita-ku, Osaka City Date of amendment order Voluntary 6 Number of inventions increased by amendment None 7 Target of amendment Drawing 8, contents of amendment Fig. 3 Fig. 6

Claims (4)

[Claims] (1) An attachment mounting device that removably attaches two types of attachments, a bolt/nut tightening socket and a screwdriver bit, to an anvil that is subjected to rotational impact, with a socket attachment part provided on the outer periphery of the anvil, and , an attachment mounting device for an impact tool, characterized in that a driver bit mounting portion is provided inside an anvil. (2) The socket mounting part is a shaft with a square cross section, the driver bit mounting part is formed of a hexagonal hole, and the driver bit mounting part is equipped with a ball that protrudes from the inner surface of the hexagonal hole with spring bias. Characteristic claim 1
Attachment mounting device for the impact tool described in section 2. (3) The impact tool attachment mounting device according to claim 1, wherein the socket mounting portion is provided closer to the tip of the anvil than the driver bit mounting portion. (4) A pin is provided in the through hole that passes through the socket mounting part and the driver bit mounting part, and the pin has semispherical ends that protrude into each mounting part, and each end is connected to the socket and driver bit mounting part. 2. The impact tool attachment mounting device according to claim 1, wherein the pins respectively engaged with the through holes are biased by springs in both directions in the annular direction of the through hole.