US 12,007,056 B2
Method of manufacturing a two component sealing gasket for plastic pipe
Mark A. Weih, San Jose (CR); and Rodney Pacheco, Montes de Oca (CR)
Assigned to S & B Technical Products, Inc., Fort Worth, TX (US)
Filed by S & B Technical Products, Inc., Fort Worth, TX (US)
Filed on Aug. 29, 2023, as Appl. No. 18/457,893.
Application 18/457,893 is a division of application No. 17/712,383, filed on Apr. 4, 2022, granted, now 11,933,442.
Claims priority of provisional application 63/201,186, filed on Apr. 16, 2021.
Prior Publication US 2023/0400136 A1, Dec. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F16J 15/02 (2006.01); B29C 45/00 (2006.01); B29C 45/14 (2006.01); F16L 47/08 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); B29L 31/26 (2006.01)
CPC F16L 47/08 (2013.01) [B29C 45/0001 (2013.01); B29C 45/14475 (2013.01); F16J 15/025 (2013.01); B29K 2023/12 (2013.01); B29K 2105/0097 (2013.01); B29L 2031/265 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of manufacturing a pipe sealing gasket designed for receipt within a raceway provided within a female bell socket end of a thermoplastic pipe, the female bell socket end having a given internal diameter which is designed to receive a given outer diameter of a mating male thermoplastic pipe end to form a pipe joint, the gasket having a hard plastic ring shaped band having a leading nose region and a trailing region, the trailing region being bonded to a relatively softer elastomer ring rubber-like material which has an outer circumferential surface which forms a seal with the raceway provided in the female bell socket and an inner circumferential surface which forms a seal with the male thermoplastic pipe end, and wherein the hard plastic band supports the elastomer ring, providing adequate stiffness to develop contact pressure between the outer circumferential surface of the elastomer ring and the raceway of the bell socket end of the pipe and between the inner circumferential surface and the mating male pipe end, the method comprising the steps of:
extruding a gasket section of a relatively softer rubber-like elastomeric material to form a given length of material having opposing free ends and having a desired final profile cross section;
splicing the opposing free ends of the gasket section together at a seam line to form a continuous gasket band of the rubber-like material joined at the seam line;
placing the spliced gasket band in a conventional plastic injection mold;
injecting a relatively harder plastic-like material over the spliced gasket band in the mold and allowing the harder plastic-like material to bond to the relatively softer rubber-like gasket band to form a finished two-part sealing gasket; and
wherein the resulting finished two-part gasket comprises the relatively softer extruded elastomeric band which is bonded to the molded band of relatively harder plastic-like material.