초록 ▼

The present invention realizes effective recoil reduction and idling strike prevention with a minimum constitution. In a tool holder (6), a thermal-resistant O-ring (22) is arranged between two steel washers (21,23) near the joint to the barrel (5). The O-ring (22) has a cross-sectional diameter of

The present invention realizes effective recoil reduction and idling strike prevention with a minimum constitution. In a tool holder (6), a thermal-resistant O-ring (22) is arranged between two steel washers (21,23) near the joint to the barrel (5). The O-ring (22) has a cross-sectional diameter of approximately 7 mm. The inner diameter of the O-ring (22) is made slightly greater than the diameter of a cylindrical portion (19b) formed at the rear of an intermediate element (19) and slightly smaller than the diameter of a flange (19a) formed at the rear of the cylindrical portion (19b). Likewise, the inner diameter is made slightly greater than the diameter of a recess (18b) of a striking member (18) formed in front thereof and slightly smaller than the diameter of a flange (18a) formed in front of the recess (18b). The cylindrical portion (19b) of the intermediate element (19) is extended backward for such a distance that, when the cylindrical portion (19b) is fitted in the O-ring (22), the flange (19a) is positioned behind, and out of contact with, the O-ring (22).

대표청구항 ▼

[ What is claimed is:] [1.] A mechanism for preventing idling strikes suitable for use with a striking tool having a piston for transmitting reciprocating motion through an air cushion to a striking member and an intermediate element coupled to a tool bit, said striking member colliding with said in

[ What is claimed is:] [1.] A mechanism for preventing idling strikes suitable for use with a striking tool having a piston for transmitting reciprocating motion through an air cushion to a striking member and an intermediate element coupled to a tool bit, said striking member colliding with said intermediate element during said reciprocating motion, the mechanism comprisingan elastic member provided between the intermediate element and the striking member, said elastic member being configured to releasably hold one of the intermediate element and the striking member, during operation, anda flange provided on the intermediate element and positioned such as to be out of contact with the elastic member and disposed on a same side of the elastic member as the striking member during operation, the flange having a diameter greater than an inner diameter of the elastic member, the flange contacting the elastic member so as to decrease the momentum of the intermediate element during idling.