Trigger-brake structure for tool machine

• US 6,909,061 B1
• Filed: 04/07/2004
• Issued: 06/21/2005
• Est. Priority Date: 04/07/2004
• Status: Active Grant

• Current Assignee: Jenn Feng Industrial Co., Ltd
• Original Assignee: Jenn Feng Industrial Co., Ltd
• Inventors: Jong, Jung-Chang
• Primary Examiner(s): LEE, KYUNG S
• Application Number:
  US10/819,203
• Time in Patent Office: 440 Days
• Field of Search: 200/334, 200/43.11, 200/43.01, 200/43.17, 200/337, 200/522, 200/332.2, 200/321
• US Class Current: 200/334
• CPC Class Codes: H01H 2300/026 Application dead man switch: power must be interrupted on release of operating member
• CPC Class Codes: H01H 9/06 Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner

Abstract

A trigger-brake structure for tool machine comprises a trigger device and a brake device arranged in a machine base, in which the trigger device is employed for starting a power switch while the brake device for constraining the power transmission. The trigger-brake structure for tool machine is characterized in that a transmission axle for power transmission is arranged in the machine base; a leverage trigger of the trigger device will apply force to another lever in the brake device when the trigger is rotated to move a self-restoring switch to therefore start the power of the machine base; and, the brake device is comprised of a flange of a spring for receiving a force applied by the trigger through a lever so that the stretch degree of a spring leaf surrounding the transmission axle can be controlled by the trigger device to thereby change the frictional force of contact surface between the spring leaf and the transmission axle.

Claims

1. 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.