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:
Jan. 17, 1984
Filed:
Jan. 20, 1983
Walter T Roush, Houston, TX (US);
Other;
Abstract
An improved stem packing. In the preferred and illustrated embodiment, the packing for the stem is captured within a housing normally described as a bonnet assembly, and is axially loaded by a cooperative jam nut and bushing. They axially load the top end of the stem packing, forcing it to expand radially inwardly and outwardly to grip the stem to seal against stem and bonnet surfaces. Extrusion of packing material typically occurs. The improved version of stem packing apparatus in the preferred and illustrated embodiment is a tubular sleeve of relatively elongate lubricated plastic material having a plurality of partial circumferential parallel cuts in it, thereby decreasing the axial load required to achieve sealing. The seal material controllably expands controlled by the cuts, thereby achieving the desired internal and external seal to prevent leakage. Torque required to rotate the stem is reduced, and extrusion of the seal material is markedly reduced.