Patent ID: 6578270
Filing Date: 2003-06-17
Classification: A01D,F16D

Abstract:
A bush cutting machine comprising:a motor; a centrifugal clutch designed to establish drive connection when a number of rotations of an output shaft of said motor exceeds a predetermined value; a blade driving shaft for transmitting a torque; a cutting blade mounted to a distal end of said blade driving shaft; said centrifugal clutch comprising a clutch drum provided on said blade driving shaft, a centrifugally pivotal member provided on the output shaft of said motor and housed in said clutch drum, and a clutch case connected to a motor housing for enclosing said pivotal member and said clutch drum; and an automatic braking mechanism housed in said clutch case and comprising a brake drum formed integrally within said clutch case, at least two centrifugal braking members pivotally mounted to said clutch drum in such a manner as to expand by a centrifugal force proportionate to the number of rotations of said clutch drum, and resilient members for biasing said braking members to said brake drum, whereby said braking members are brought into abutting engagement with said brake drum with decrease in the number of rotations of said clutch drum.