초록 ▼

An impact tool includes a body, a barrel mounted on the body and a cylinder disposed within the barrel and reciprocally moved by a drive mechanism. A communication groove is formed between the cylinder and the barrel and communicates with the outside. The cylinder includes a plurality of communicati

An impact tool includes a body, a barrel mounted on the body and a cylinder disposed within the barrel and reciprocally moved by a drive mechanism. A communication groove is formed between the cylinder and the barrel and communicates with the outside. The cylinder includes a plurality of communication holes formed in a radial direction and spaced from each other in a longitudinal direction. A striker is reciprocally movable within the cylinder, and an air chamber is formed between the striker and the cylinder. The striker is positioned at a first position when the tool bit is not pressed on a work. The striker at the first position permits communication between the air chamber and the communication groove through any one of the communication holes so as to be prevented from idle impact. Further, the striker is movable to a second position rearward of the first position through the pressing operation of the tool bit on the work. The striker at a position rearwardly of the second position prevents communication between the air chamber and the communication groove so as to permit normal impact operation by the tool bit.

대표청구항 ▼

An impact tool comprising: a body; a barrel mounted on said body; a mounting portion of a tool bit disposed at a forward end of said barrel; a cylinder disposed within said barrel and having a closed rear end and an open forward end, said cylinder forming between the inner wall of said barrel a comm

An impact tool comprising: a body; a barrel mounted on said body; a mounting portion of a tool bit disposed at a forward end of said barrel; a cylinder disposed within said barrel and having a closed rear end and an open forward end, said cylinder forming between the inner wall of said barrel a communication groove which communicates with the outside, and having a plurality of communication holes formed in a radial direction and spaced from each other at a predetermined distance in a longitudinal direction of said cylinder; a drive mechanism mounted on said body and connected with said cylinder so as to reciprocally move said cylinder within said barrel; and a striker reciprocally movable within said cylinder so as to form an air chamber between the inner wall of said cylinder, said striker being positioned at a first position when said tool bit mounted on said mounting portion is not pressed on a work, and being movable to a second position rearward of said first position through the pressing operation of said tool bit on the work; wherein said striker at said first position permits communication between said air chamber and said communication groove through any one of said communication holes during the reciprocal movement of said cylinder within said barrel, so that said striker may be prevented from idle impact, and wherein said striker at a position rearwardly of said second position prevent communication between said air chamber and said communication groove, so that said striker may be reciprocally moved as the movement of said cylinder so as to permit normal impact operation by said tool bit.