Patent ID: 8176643
Filing Date: 2012-05-15
Classification: B27B,Y10T

Abstract:
1. A chain saw braking system for a chain saw having a main body in which there is provided an engine and a chain provided with saw blades, the engine rotating the chain around a guide member provided in the main body by engine drive, wherein the chain saw braking system stops a movement of the chain and comprises: a drum provided on a rotary shaft of a sprocket for transferring a driving force of the engine to the chain, the drum being rotated together with the sprocket; a belt that is wound around the drum and has first and second ends which are drawn in opposite directions to each other; first and second biasing units that bias the first and second ends of the belt in the opposite directions to tighten the drum; an engagement member that engages the belt with the main body to counteract a biasing force of the first biasing unit; and a restricting unit that restricts, within a given area, the second end of the belt from being moved following a movement of the first end of the belt when the first end is moved by the biasing force of the first biasing unit; and a movement transmitting member that moves the second end of the belt in accordance with a movement of a throttle lever for controlling an output of the engine; wherein the restricting unit is separated from the movement transmitting member.