Brushing – scrubbing – and general cleaning – Machines – Brushing
Patent
1987-07-27
1988-07-19
Roberts, Edward L.
Brushing, scrubbing, and general cleaning
Machines
Brushing
15320, 51177, 340679, A47L 1116
Patent
active
047575662
ABSTRACT:
An automatic tool torque compensator for a surface maintenance machine such as a sweeper or scrubber includes an actuator for raising and lowering one or more rotatable surface maintenance tools and one or more electric or hydraulic motors for driving the tools. There is a circuit for sensing the current load in at least one of the electric motors, or the differential pressure in one or more of the hydraulic motors, and providing a signal representative thereof. There is a circuit for manually selecting a desired tool torque to be applied from a plurality of possible tool torques and for providing an electrical signal representative thereof. The electrical signal representative of the desired tool torque to be applied to the tools and the drive motor load current signal or the differential hydraulic pressure signal representative of actual tool torque applied to the tools are used to control the actuator for raising and lowering the surface maintenance tools. This automatically varies the pressure of the tools against the surface to maintain a desired torque in the tools at a nearly constant value even though the surface may vary in its resistance to the tools due to variations in its elevation or texture, or the degree of soilage on it.
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Field Bruce F.
Kasper Joseph G.
Roberts Edward L.
Tennant Company
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