The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 1979
Filed:
Feb. 03, 1978
Johannes V Baatrup, Sonderborg, DK;
Ivar Rasmussen, Sonderborg, DK;
Danfoss A/S, Nordborg, DK;
Abstract
The invention relates to a vehicle steering control device of the type having a housing, inner and outer rotary slide members disposed in a bore of the housing and forming a reversing switch. The housing has inlet and outlet ports and two motor ports. Four axially adjacent spaced grooves being in the interface between the bore of the housing and the outer rotary slide member with the first and fourth grooves being connected to the inlet and outlet ports and second and third grooves being connected to the two motor ports. A steering shaft is connectable to the inner rotary slide member and a measuring motor which, on actuation of the control device, is connected to the inlet port to cause the outer rotary slide member to follow the inner rotary slide member. The leakage of pressurized fluid from one annular groove to another can cause erratic operation because the fluid in the motor passages linked by the second or third grooves is a definite, precise metered quantity because it is supplied by the metering motor. To impede the short circuiting of pressurized fluid from one annular groove to another, auxiliary annular grooves containing unmetered pressurized fluid are provided adjacent to the second and third grooves to impede the flow of pressurized fluid into or out of these grooves.