×

Street sweeping machine

  • US 4,328,603 A
  • Filed: 12/08/1980
  • Issued: 05/11/1982
  • Est. Priority Date: 10/01/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. In a street sweeping vehicle having a driver'"'"'s cab, a debris elevating system driven by a hydraulic motor, and brush means for feeding debris to the elevator system, apparatus for energizing the motor and controlling its operation, comprising:

  • a source of fluid pressure;

    selector valve means coupled between said source and the hydraulic motor and selectively operable in one of three modes either for shutting off the flow of energy to the motor, for energizing the motor in a forward direction, or for energizing the motor in a reverse direction;

    handle-actuated means located in the driver'"'"'s cab for switching said selector valve means to a selected one of its three operating modes;

    relief valve means associated with said source and responsive, whenever said elevating system becomes jammed, to relieve the pressure developed from said source when the same reaches a maximum safe level; and

    visual indicator means visible from the driver'"'"'s cab and coupled to said relief valve means and responsive to said maximum safe pressure level for indicating that the elevating system is jammed.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×