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:
Aug. 04, 1981
Filed:
Nov. 05, 1979
Thomas W Bunyan, London, GB;
Pilgrim Engineering Development Ltd., London, GB;
Abstract
A hydraulic nut or washer or bolt head comprises piston means let into the recessed end-face of a body. Means for applying hydraulic pressure to a chamber or chambers behind the body are provided to urge the piston means in a direction which leads out of the end face. The piston means has an overall dimension in a first transverse direction which is less than the least possible overall dimension of an annular piston giving the same piston face area and having an overall dimension in another transverse direction, at right angles to the first, which is less than the least overall major dimension for a pair of opposed circular pistons giving the same piston face area. A sealing member comprising a layer of moulded deformable substantially incompressible material on a former is provided in the chamber to contain the hydraulic fluid.