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. 19, 1977
Filed:
Nov. 12, 1975
Lee R Andre, Tecumseh, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A shock absorber for a motor vehicle suspension includes a piston construction having flow control valving that becomes more restrictive during the life of the shock absorber to compensate for the reduction in friction damping in the suspension during usage. The piston valving includes a flow passage surrounded at one of its ends by an annular land that forms a valve seat. A valve element is urged to a closed position against the seat by the cumulative force of a primary spring and a secondary spring. The secondary spring provides a spring force countering the force of the primary spring but is constructed to progressively take a permanent set after repeated cycling whereby the cumulative force of the two springs urging the valve element to a seated condition will increase during the service life of the shock absorber.