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. 21, 1992
Filed:
Jan. 07, 1991
John D Butler, Van Wert, OH (US);
Jon A Chandler, Brighton, MI (US);
Federal-Mogul Corporation, Southfield, MI (US);
Abstract
A method of making an oil seal (10) having two separate annular lips (62, 64) formed by splitting a single lip liner blank (12). The lip liner blank is an annular wafer having an annular groove (14) formed on one side (15) of the wafer at the point on the wafer where the wafer is intended to be split into two annular pieces (49, 50). A mold (32) is loaded with the lip liner blank (12), a prep ring of elastomeric material (43) and a seal case (b 44) and then closed thereby clamping the prep ring and wafer between upper and lower dies (40 and 36) of the mold. In the molding step the prep ring and wafer are heated and compressed causing the prep ring to become molten as it flows over the wafer. The molten elastomeric material enters the groove and pressure exerted by the elastomeric material against the groove splits the wafer into two annular pieces (49, 50). A first annular piece (49) is displaced in the mold to the desired location of the excluder lip (64). A second annular piece of the wafer lines the main lip (62) of the oil seal (10).