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. 11, 1997
Filed:
Dec. 16, 1994
Applicant:
Inventor:
Wendell D Tackett, Ann Arbor, MI (US);
Assignee:
Kelsey-Hayes Company, Romulus, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60T / ;
U.S. Cl.
CPC ...
3031164 ; 3031163 ; 277103 ;
Abstract
A piston-type pump suitable for use in vehicle control systems contains a piston element sliding within a stepped bore of a pump body, leakage of fluid past the piston element being prevented through use of a stationary seal surrounding the piston element and located at the end of the larger diameter stepped bore and fixed at that position by the end of a plug which is preferably shaped so as to include within the plug the pump cavity. The outer end of the piston element is urged by a return spring contained within the pump cavity against an oscillatory driving unit. Inlet and outlet check valves ensure unidirectional flow of hydraulic fluid.