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. 23, 1994
Filed:
Aug. 02, 1993
Harold L Lanterman, Stow, OH (US);
Teledyne Hyson, Cleveland, OH (US);
Abstract
An apparatus to cushion movement of a member in a machine includes a piston which divides a cylinder into upper and lower variable volume chambers. A body of lubricating liquid is held in a chamber in the piston. Lubricating liquid is conducted from the chamber in the piston to an annular space between upper and lower seals on a head portion of the piston. During reciprocation of the piston, the lubricating liquid engages the inner side surface of the cylinder. In addition, the lubricating liquid conducts heat away from the cylinder. Fluid pressure is applied against upper side surface of the body of lubricating liquid in the piston chamber by gas pressure conducted from a chamber of the cylinder. During assembly of the apparatus, the piston is inserted part way into the cylinder and a space between seals on the piston is partially filled with lubricating liquid. The piston, with the lubricating liquid between the seals, is fully inserted into the cylinder. In addition, the chamber in the piston is partially filled with lubricating liquid.