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:
Dec. 28, 1982
Filed:
Jul. 23, 1980
Robert Turner, Rayleigh, GB;
Cam Gears Limited, Hertfordshire, GB;
Abstract
A power assisted steering gear assembly having a first fluid system 5 comprising a first pressure operated device such as a double acting piston and cylinder, a first valve for controlling fluid flow to the first pressure operated means in response to a steering input in shaft 2 and a first fluid pump 7. The first pressure operated means can be a conventional power assisted steering gear 1 imparting rotation to a drop arm 8. A second fluid system 20 comprises second valve means controlling fluid flow from a second pump 26 to a second piston and cylinder device incorporated in a ram unit 12. The second valve in the ram unit 12 is responsive to displacement of the drop arm 8 and reacts to determine power assistance provided by the system 20 to a steering maneuver, such power assistance being additional to that provided by the system 5. Displacement of the ram unit 12 controls movement of a steering linkage through drag link 38. In a modification the system 20 can include an auxilliary valve which is responsive to fluid pressure in the system 5 so that when that pressure attains a predetermined value the auxilliary valve reacts to render ineffective power assistance from the ram unit 12. In the event of fluid pressure failure in the system 5 the auxilliary valve reacts to restore pressure fluid to the ram unit 12 and provide power assistance in the system 20.