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. 18, 1986
Filed:
Apr. 22, 1985
Robert J Diehl, Wallis, TX (US);
F Harold Hollister, Richmond, TX (US);
Danny S Meyer, Richmond, TX (US);
Joy Manufacturing Company, Pittsburgh, PA (US);
Abstract
A 'fire-resistant' packing arrangement (30) for use with linear motion or rotary motion shafts (20) characterized by a stepped dual diameter packing chamber provided by successive enlargements of the stem bore (22). A primary packing assembly (31) disposed in the chamber section (20b) of smaller diameter and cross-sectional areas and located nearest the fluid pressure provides for sealing under normal temperature and operating conditions. A secondary packing assembly (32) in the larger diameter chamber section (20c) and fabricated of 'high temperature' materials is adapted to maintain sealing effectiveness in the event of abnormally high temperatures. A packing support ring (35) disposed in the larger diameter chamber section (20c) intermediate the two packing assemblies and supportable on the shoulder (62) provided by the stem bore enlargement, supports the secondary packing (32) and in the event of a decomposition of the primary packing (51) induced by extreme temperature conditions permits the secondary 'high temperature' packing to maintain a seal. A packing retainer ring (38) located at the outer end of the packing arrangement as an outer packing stop is axially adjustable to provide a preload energization of the primary packings.