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:
Jun. 04, 1985
Filed:
Nov. 10, 1983
Keith H Carpenter, Kettering, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
To assure adjustability under all internal pressure conditions a hydraulic damper having a hollow piston rod, a piston on the end of the rod slidable in a fluid filled tube and cooperating with the latter in defining inversely variable volume compression and rebound chambers, and at least two relief valves on the piston connected to the compression chamber for passing fluid thereto at two different levels of pressure relief, includes a right cylindrical valve spool in the piston rod bore rotatable between a plurality of control positions corresponding to pressure relief at the different relief pressure levels, first passages between the rebound chamber and the piston rod bore, second passages between each of the relief valves and the piston rod bore, first circumferentially symmetrically arrayed ports in the valve spool registerable with the first passages to always connect the rebound chamber to the valve spool, second circumferentially symmetrically arrayed ports in the valve spool to selectively connect respective ones of the relief valves to the valve spool, and a hollow tube through the valve spool open to the compression chamber to equalize pressure on opposite ends of the valve spool.