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:
May. 24, 1983
Filed:
Nov. 02, 1981
Danny S Meyer, Richmond, TX (US);
ACF Industries, Incorporated, New York, NY (US);
Abstract
A packing assembly (10) for sealing the annulus between concentric tubular members (12, 14). The assembly (10) includes upper and lower sealing ring assemblies (31, 32) on each side of a lantern ring (33), and upper and lower retainer rings (36, 35) located atop and below the sealing ring assemblies and bolted together to maintain the rings in stacked concentric relation. Each sealing ring assembly (31, 32) includes a central lubricating packing ring (34) having inner and outer lubricating surfaces of graphite material; an inner pair of upper and lower metal seal rings (69, 70) seated in annular grooves in the central lubricating packing ring (34); and an outer pair of upper and lower metal seal rings (83, 84) located in annular grooves in the outer periphery of the lubricating packing ring (34). The metal seal rings and the packing ring are each provided with cooperative camming surfaces (72 and 41; 76 and 46; 85 and 61; 88 and 66) which interact when an axial compressive force is applied to the assembly (10) to thereby effect a controlled radial expansion of the sealing ring assemblies (31, 32) and establishing metal-to-metal seals (81, 82) and a lubricating packing seal with the annulus walls (11, 13). The axial compressive force is mechanically applied by the camming action of holddown screws (100) with a camming surface (102) on the upper retainer ring (36) and the outer tubular member is provided with an aperture (110) to permit injection of lubricant into the lantern ring for energizing the seals in emergency situations.