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. 25, 1992
Filed:
Jan. 09, 1991
Applicant:
Inventor:
William H Todd, Winston-Salem, NC (US);
Assignee:
Todd Motion Controls Inc., Winston-Salem, NC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
91518 ; 91519 ; 92108 ;
Abstract
A piston assembly employs a central velocity tube which provides an increase in speed of the initial downward stroke phase while requiring less power than conventional hydraulic cylinder assemblies. A second stage hydraulic surge causes the piston to forcefully descend the final increment of the downstroke for an increase in power of the piston. The return or upstroke of the piston is of conventional hydraulic design.