초록 ▼

A large capacity, self-propelled walk-behind power tool, such as a lawn mower, employs gear-operated transmissions for independently driving each drive wheel. Control handles are connected to idler pulley levers and brake levers to control the movement of the driving wheels. A constant input rate to

A large capacity, self-propelled walk-behind power tool, such as a lawn mower, employs gear-operated transmissions for independently driving each drive wheel. Control handles are connected to idler pulley levers and brake levers to control the movement of the driving wheels. A constant input rate to the control handles results in a variable output rate to the idler pulley levers and the brake levers.

대표청구항 ▼

[ What is claimed is:] [1.] A self-propelled, walk-behind power tool comprising:a power deck including a bed, an engine mounted on an upper surface of said bed and having a rotatable drive shaft depending therethrough,left and right drive wheels each being journalled on opposite sides of said bed fo

[ What is claimed is:] [1.] A self-propelled, walk-behind power tool comprising:a power deck including a bed, an engine mounted on an upper surface of said bed and having a rotatable drive shaft depending therethrough,left and right drive wheels each being journalled on opposite sides of said bed for rotation about an axle, and means for connecting said engine to said drive wheels including a pair of idler pulley levers pivotally attached to said bed,a handle bar attached to a rear side of said power deck,left and right control handles operative to control operation of said left and right drive wheels, respectively, positioned on said handle bar,means for biasing each of said control handles to a neutral position, said control handles being pivotable from said neutral position to a drive position, andfirst means for moving each of said idler pulley levers at a first rate in response to a constant input to pivot each control handle from said neutral position to a first position intermediate said neutral and drive positions, and at a second rate in response to said constant input to pivot each control handle from said intermediate position to said drive position.