Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1973-11-15
1976-03-02
Schwadron, Martin P.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
60468, 91400, 91412, F15B 1108, F15B 1304
Patent
active
039410331
ABSTRACT:
The invention relates to a hydraulic steering apparatus comprising a continuously operating pump, an operating motor for controlling the parts to be steered, a control device which is adjustable by the steering wheel and which, in its neutral position, connects the pump to a tank through a short-circuiting path. The control device has two operating positions in which the pump is connected to one side or the other of the operating motor and connects the other side of the operating motor to the tank. The control device has a control element connected to a steering wheel and a following element connected to a metering motor and these elements are relatively displaceable to a limited extent. Apparatus is provided to prevent the steering parts moved by the operating motor from striking mechanical abutments. The end position of the travel of the operating motor is associated with a limit switch device and a short circuiting path between the primary side of the control device and the tank is established by a switching valve which is a part of the limit switch device.
REFERENCES:
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patent: 2728193 (1955-12-01), Bacchi
patent: 2838030 (1958-06-01), Spink
patent: 3191505 (1965-06-01), Defibaugh et al.
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patent: 3463260 (1969-08-01), Baines et al.
patent: 3524386 (1970-08-01), Cudnohufsky
patent: 3537356 (1970-11-01), Odell
patent: 3635020 (1972-01-01), Mahlmann
patent: 3700396 (1972-10-01), Adams
patent: 3779136 (1973-12-01), Hohlein
Danfoss A/S
Hershkovitz Abraham
Schwadron Martin P.
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