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. 19, 1980
Filed:
Mar. 08, 1979
Michael A Roussin, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A seal (44,144) between two relative movable structures (14,30) is provided. The seal has a hollow chamber (50) which is gas filled either permanently or when desired. The seal (44,144) has a driving portion (46,146) which may be of the same or of different material from a sealing portion (48,148) with the two portions integrally formed or sealingly joined together. A sealing band or contact surface (57) is provided on the sealing portion (48,148) which has a sealing lip (56) in contact with a facing surface (41) and maintains a substantially constant face angle during axial displacement of the two structures (14,30). The internal gas pressure in the seal may be varied depending on the environmental and temperature conditions and, once sealed, the amount of pressure may be either permanently maintained or changed when desired. It is contemplated that if the material of the seal or any portion thereof has a high permeability to the gas in the seal, a thin membrane (70,170) of material having a low permeability to the gas can be provided in the chamber (50) to protect said high permeability material.