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:
Sep. 30, 2003
Filed:
Jun. 04, 2001
Elond W. Walden, Mantua, NJ (US);
HPS, Inc., West Deptford, NJ (US);
Abstract
A multi-tube hydraulic cylinder includes annular seal assemblies joining adjacent tubes. Each assembly includes an annular primary seal member and an annular base seal member. The primary seal member is formed from relatively soft elastomer and includes inner and outer seal ribs which engage the bottom of a seal groove and the surface of an adjacent tube. The primary seal member is mounted on the base seal member, is formed from an elastomer harder than the material in the primary seal member, and includes inner and outer seal ribs and a heel facing outwardly of the seal groove on the end of the base member away from the seal ribs. The base member has an axial length greater than its radial thickness. When the seal assembly is compressed between the two tubes the seal ribs of the two members provide low pressure and high pressure seals for confining hydraulic fluid in the chamber. The heel is biased into the base member and holds the member in the groove to prevent rotation due to frictional engagement with the other tube during relative movement of the tubes.