초록 ▼

A mechanical system for a controlling a reversible pump in a walk-behind turf care machine having a hydrostatic drive and operator speed and traction controls. The pump includes a rotatable trunion shaft connected to the traction control for controlling hydrostatic pump displacement and direction. A

A mechanical system for a controlling a reversible pump in a walk-behind turf care machine having a hydrostatic drive and operator speed and traction controls. The pump includes a rotatable trunion shaft connected to the traction control for controlling hydrostatic pump displacement and direction. A rotatable lever structure fits over the trunion shaft and includes a rotary sleeve, an arm and roller. A control bracket, including a V-shaped contact portion having opposed surfaces for engaging the roller, is operatively connected to the speed and traction controls and to the turf machine frame about a pivot point. Operator manipulation of the control bracket via the speed and traction controls causes a rotatable engagement between the control bracket and the roller, which in turn sets the maximum forward/reverse speeds and direction of the hydrostatic drive. When the traction control is neutral, a spring arrangement is provided for urging of the hydrostatic pump into its neutral position. An improved operator station is also provided.

대표청구항 ▼

In a walk-behind turf machine including a base mounted on a plurality of wheels, a support structure affixed to and extending from said base, a power source operatively mounted to said base, at least one hydrostatic pump operatively connected to said base for driving at least one of said wheels, and

In a walk-behind turf machine including a base mounted on a plurality of wheels, a support structure affixed to and extending from said base, a power source operatively mounted to said base, at least one hydrostatic pump operatively connected to said base for driving at least one of said wheels, and a turf machine-operator interface extending from said support structure, a mechanical control system for regulating operation of said hydrostatic pump, comprising: a rotatable trunion shaft extending from said hydrostatic pump for controlling maximum hydrostatic pump displacement and direction; speed and traction controls mounted on said operator interface and in mechanical communication with said trunion shaft; a pivoting lever structure including a rotary sleeve fitted over said trunion shaft, said lever structure including an arm extending transversely from said rotary sleeve and having a roller attached thereto; and a control bracket operatively connected to said turf machine speed and traction controls and including a bracket contact surface for engaging said roller of said rotary sleeve, said control bracket being arranged for selectively controlling maximum allowed forward and reverse speeds of at least one of said turf machine wheels by controlling rotation of said trunion shaft through rotatable engagement of said control bracket with said roller of said rotary sleeve, said control bracket further selectively rotating said trunion shaft to a neutral mode of operation in response to movement of said traction and speed controls.