Title: Hydraulic steering apparatus

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.

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Inventors: Olsen, Carl Ivar (Sonderborg, DK)

Application Number: 416179
Filing Date: 1973-11-15
Publication_date: 1976-03-02
Assignee: Danfoss A/S (Nordborg, DK)
Primary Class(es): 91/446 60/468, 91/189R, 91/400, 91/518, 91/536
Other Classes:
US Patent Ref:

2426411	Aug, 1947	Peterson et al.	91/400.
2728193	Dec, 1955	Bacchi	91/400.
2838030	Jun, 1958	Spink	60/468.
3191505	Jun, 1965	Defibaugh et al.	91/446.
3252380	May, 1966	Jablonsky et al.	91/400.
3463260	Aug, 1969	Baines et al.	60/494.
3524386	Aug, 1970	Cudnohufsky	91/468.
3537356	Nov, 1970	Odell	91/400.
3635020	Jan, 1972	Mahlmann	91/449.
3700396	Oct, 1972	Adams	91/449.
3779136	Dec, 1973	Hohlein	91/446.

Other Refs:
Primary Examiner: Schwadron, Martin P.
Assistant Examiner: Hershkovitz, Abraham
Attorney: