Patent ID: 6909061

Claim:
A trigger-brake structure for tool machine, comprising a trigger device and a brake device arranged in a machine base, the trigger device employed for starting a power switch while the brake trigger for constraining power transmission, in which a transmission axle is disposed in the machine base for providing power transmission; a trigger has a pivot formed at a front end thereof, and arranged in the machine base and further extended forwards to form an extension rod for moving a self-restoring switch to start the power source in the machine base when the trigger swivels; the brake device is comprised of a lever, a guiding channel, a spring, and a spring leaf, in which the lever is pivotally connected with a supporting pin defined on an inner wall of the machine base, and a front end thereof is designed to mate with the spring while a rear end thereof is designed to mate with the extension rod of the trigger, the guiding channel is fixedly disposed in a hollow interlayer of the machine base; the spring is located and limited in the guiding channel, and a flange is formed at one end thereof to mate with the extension rod of the trigger; and the spring leaf is a flexible plate surrounding the transmission axle, and one end thereof fixedly contacts the flange of the spring while the other end contacts the machine base to thereby change the frictional force of contact surface between the spring leaf and the transmission axle.