Excavating – Snow or ice removing or grooming by portable device – Railway clearer
Patent
1983-12-27
1985-03-05
Eickholt, E. H.
Excavating
Snow or ice removing or grooming by portable device
Railway clearer
91189R, E02F 500, F01L 1500
Patent
active
045022356
ABSTRACT:
A control system for a push-pull unit mounted on a motor scraper has a push-pull control circuit including a bail actuating cylinder and a directional change-over valve, a suspension control circuit and an electric operating circuit for changing over the directional change-over valve to supply fluid under pressure from a hydraulic pump into either the push-pull control circuit or the suspension control circuit in accordance with the operator's indication. The directional change-over valve is changed over by an actuator connected with a pressure source through a pressurized medium passage in which solenoid operated valves controlled by the electric operating circuit are provided.
REFERENCES:
patent: 3339658 (1967-09-01), Peterson
patent: 3443379 (1969-05-01), Weisenbach
patent: 3512278 (1970-05-01), Bechman
patent: 3977699 (1976-08-01), Wagatsuma
patent: 4018452 (1977-04-01), Wagatsuma et al.
Miyake Kimio
Sugimoto Kiyoshi
Eickholt E. H.
Kabushiki Kaisha Komatsu Seisakusho
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