| 摘要 |
Disclosed herein is a lawn mower comprising a prime mover mounted on a housing and including an output shaft extending into the housing, a first pulley sheave fixed to the output shaft for common rotation therewith and including an inclined surface, a blade assembly mounted on the output shaft for relative rotation therebetween and including a cutter blade, and a combined pulley sheave and brake drum fixed to said cutter blade, which combined pulley sheave and brake drum includes a pulley sheave portion comprising an inclined surface facing the inclined surface of the first pulley sheave and a brake drum portion, an endless member trained between the inclined surfaces, an idler pulley around which the endless member is trained and mounted on the housing for movement between a first position locating the idler pulley to remove slack from the endless belt, thereby drivingly connecting the first and second sheaves for common rotation, and a second position locating the idler pulley to permit slack in the endless member, thereby permitting relative rotating between the first and second sheaves, a brake band anchored at one end to the housing and movable between a braking position engagable with the brake drum portion and a non-braking position spaced from the brake drum portion, which brake band is fabricated of resilient material and is self-biasing into the braking position, which brake band is also connected to the idler pulley so as to bias the idler pulley to the second position, and a handle adapted to be operated by a user for displacing the idler pulley to the first position and the brake band to the non-braking position against the biasing action of the brake band.
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