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:
Feb. 16, 1993
Filed:
May. 01, 1992
Dwight B Stephenson, Savage, MN (US);
Keith R Carlson, Victoria, MN (US);
Kenneth G Rasmussen, Maple Grove, MN (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A hydrostatic power steering device (11;111) is provided of the type including a primary, spool valve (35;135), and a follow-up, sleeve valve (37;137). During normal operation, relative rotation of the spool and sleeve define one or more variable flow control orifices (A1A5; AN; A1) and these orifices have a first area versus deflection relationship when the sleeve is biased to its first position (FIG. 5; FIG. 10). The sleeve may be moved toward a second position (FIG. 6; FIG. 11) in response to an input (95, 99) other than rotation of the vehicle steering wheel. In the second axial position of the sleeve, the flow control orifice has a different area versus deflection relationship, the difference providing a useful steering or ancillary function.