Patent ID: 6105258
Filing Date: 2000-08-22
Classification: A01D

Abstract:
A portable trimmer comprising:a rotatable cutter;a brake device for breaking said rotatable cutter;an engine for driving said rotatable cutter;a centrifugal clutch for transmitting power generated by said engine to said rotatable cutter, said centrifugal clutch having a clutch drum;a stand which is movable a predetermined stroke in an upward direction when said portable trimmer is placed on a generally flat surface;a cam member having a first cam surface and a second cam surface adjacent to said first cam member surface, said cam being rotatable about an axis between a braking rotational position and a brake releasing rotational position caused by an upward or downward movement of said stand;a leaf spring having a free end which slidably engages with a peripheral surface of said cam member;first pressing means for pressing said free end of said leaf spring against said cam surfaces of said cam member; anda friction element, disposed opposite to said clutch drum of said centrifugal clutch, said friction element having a friction element movement between (A) a braking position at which said friction element slidably engages with said clutch drum and (B) a brake releasing position at which said friction element is apart from said clutch drum, said friction element movement caused by the movement of said free end of said leaf spring;wherein:said cam member takes said braking rotational position when said stand moves upwardly so that said first cam surface abuts with said free end of said leaf spring; andsaid cam member takes said brake releasing rotational position when said stand moves downwardly so that said second cam surface abuts with said leaf spring, whereby said friction element takes said brake releasing position.