Patent ID: 7779617

Claim:
A sliding pulley drive mechanism in the cutting platform of a lawn mower, comprising: an engine for the pulley drive mechanism fixed to a chassis; a cutting platform connected to the chassis, and capable of moving up and down in relation to the chassis; a bracket fixed to the cutting platform; cutting platform drive belts fitted over an output shaft of the engine and connecting the output shaft to the cutting platform; wherein, an external spline shaft is fitted over the output shaft of the engine; a belt pulley with an internal spline is mounted on the external spline shaft; the cutting platform drive belts are mounted on the belt pulley with an internal spline; the lower end of the belt pulley with an internal spline is connected with a shock absorbing bushing, a bearing, and a bearing base plate; the bearing base plate is connected to the bracket, wherein, the belt pulley with an internal spline is connected to an inner race of the bearing, while the bearing base plate is connected to an outer race of the bearing; the shock absorbing bushing is fixed to the bearing base plate.