Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1984-07-03
1985-12-03
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15339, E01H 108
Patent
active
045558264
ABSTRACT:
A hydraulic control system for a vacuum sweeper truck including a hydraulic pump coupled to the truck's engine, a reservoir of hydraulic fluid, a hydraulic fan motor, a hopper actuator, and a valve assembly having three operative positions. In a first position the hopper actuator is deactivated and full power goes to the vacuum fan motor. In a second position the hydraulic fluid is diverted to the hopper actuator to raise the hopper and the vacuum fan motor is run at a reduced speed by hydraulic fluid returning to the reservoir. In a third position, the hydraulic fluid is again diverted to the hopper actuator to drive the hopper in a second direction, and again the fan motor is run at a reduced power level. A compensator is coupled to the hydraulic pump and is responsive to a cut-off setting and to the hydraulic pressure produced by the pump. A pressure adjustment means is provided in the cab of the truck which is coupled to the flow regulator to permit the truck operator to vary the cut-off setting of the flow regulator.
REFERENCES:
patent: 3691579 (1972-09-01), Kasper
patent: 3744653 (1973-07-01), Jensen
patent: 4138756 (1979-02-01), Krier et al.
patent: 4193159 (1980-03-01), Beard
Rodgers Jack
Rodgers Mark F.
Hickman Paul L.
Moore Chris K.
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