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:
May. 11, 1982
Filed:
Mar. 07, 1980
Jack T Gregory, San Anselmo, CA (US);
Other;
Abstract
A hand operated tool comprising a cylinder with a drive piston therein operative to drive the cylinder to deliver a substantial lineal force. The piston has a large, tubular piston rod which functions also as a reservoir for the hydraulic fluid. A plurality of oil passages bored through the drive piston have small pump pistons reciprocable therein to receive on each return stroke a quantity of fluid from the self-contained reservoir to be delivered on the pump stroke to the other side of the drive piston. A wobble plate is mounted on the drive piston to drive the small pump pistons by tilting against them. A motor carried on the trailing end of the tubular piston rod rotates a shaft to drive a wheel carrying tapered pressure rollers around the wobble disc, tilting it against the pump pistons in circumferential sequence.