JPH0467978U

JPH0467978U -

Info

Publication number: JPH0467978U
Application number: JP10955390U
Authority: JP
Priority date: 1990-10-19
Filing date: 1990-10-19
Publication date: 1992-06-16

Description

[Brief explanation of the drawing]

第１図は衝撃工具の前端部の外観、第２図は第
１図の縦断面、第３図は第１図第２図のＡ−Ａ、
Ｂ−Ｂ断面の拡大断面図のうち本考案の構成にし
た場合の断面を示すもので、第４図は第３図のチ
ゼル保持ピン先端の係止部の部分拡大断面図、第
５図は本考案の別の実施例の構成を示す部分拡大
断面図である。また、第６図は第１図第２図のＡ
−Ａ、Ｂ−Ｂ断面の拡大図であるが、従来技術の
構成にした場合の断面図を示すものである。１……衝撃工具本体、３……チゼル、４……凹
状切欠き部、５……チゼル挿入孔、６……チゼル
保持ピン挿入孔、７……チゼル保持ピン、８……
拡径部、９……抜け止めピン挿入用貫通孔、１０
および１１……本体側壁の座面、１２……弾性体
リング、１３……環状部材、１４……抜け止めピ
ン、１５……環状空所、１６……皿バネ、１７…
…スキマ。 Figure 1 is the external appearance of the front end of the impact tool, Figure 2 is the vertical cross section of Figure 1, Figure 3 is A-A in Figures 1 and 2,
Among the enlarged cross-sectional views of the B-B cross section, the cross-sections are shown when the configuration of the present invention is adopted. FIG. 4 is a partially enlarged sectional view of the locking part at the tip of the chisel holding pin in FIG. 3, and FIG. FIG. 7 is a partially enlarged sectional view showing the configuration of another embodiment of the present invention. Also, Figure 6 is A of Figure 1 and Figure 2.
Although it is an enlarged view of the -A and BB cross sections, it shows a cross-sectional view when the configuration of the prior art is used. 1... Impact tool body, 3... Chisel, 4... Concave notch, 5... Chisel insertion hole, 6... Chisel holding pin insertion hole, 7... Chisel holding pin, 8...
Expanded diameter part, 9...Through hole for inserting retaining pin, 10
and 11... seating surface of main body side wall, 12... elastic ring, 13... annular member, 14... retaining pin, 15... annular cavity, 16... disc spring, 17...
…gap.

Claims

[Scope of claim for utility model registration] (1) A chisel insertion hole is provided in the front part of the impact tool body,
A chisel holding pin insertion hole is provided through the main body so as to partially overlap the inner diameter of the chisel insertion hole in a direction perpendicular to the chisel insertion hole, and a chisel with a concave notch formed near the upper end is attached to the main body. Insert it into
While aligning the position and orientation of the chisel holding pin insertion hole and the concave notch of the chisel, the chisel holding pin, which has an enlarged diameter portion at the rear end and a retaining pin insertion hole at the tip, is inserted into the chisel. While holding the chisel by inserting it into the holding pin insertion hole,
An annular member is inserted into the distal end of the chisel holding pin protruding from the main body, and the retaining pin is inserted into the retaining pin insertion hole at the distal end of the chisel retaining pin to lock the annular member. In a chisel attachment device for an impact tool, a cutout is made at a substantially right angle along the entire circumference along the inner edge of the through hole at the corner where the chisel holding pin through hole of the annular member intersects with the side surface facing the impact tool body. A notch is provided, and an elastic ring having a cross-sectional diameter slightly larger than the depth of the notch is attached to an annular space with a substantially rectangular cross section formed by the notch, the side surface of the impact tool body, and the outer diameter portion of the chisel holding pin. and presses the annular member against the main body, maintains a slight gap between the main body and the annular member, and generates a repulsive force due to the restoring force of the elastic body to lock the chisel holding pin. A chisel mounting device for an impact tool, characterized in that it is configured as follows. (2) The elastic ring is a synthetic rubber ring with a circular cross section, a substantially rectangular cross section with four corners cut off, or a polygonal ring, or a metal disc spring as set forth in claim 1 of the utility model registration claim. Chisel attachment device for impact tools.