Solid anti-friction devices – materials therefor – lubricant or se – Solid anti-friction device – article or material therefor – Halogen compound
Reexamination Certificate
2001-02-22
2002-04-02
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Solid anti-friction device, article or material therefor
Halogen compound
C384S299000, C384S300000, C428S422000, C442S361000, C442S397000
Reexamination Certificate
active
06365556
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to self-lubricating bearing and bushing liners, and more particularly to self-lubricating liners that provide good high temperature wear resistance without the brittleness of glass fiber.
2. Discussion of the Related Art
It is known in the art to utilize self-lubricating bearings or bushings to provide low wear rates in a variety of high load applications. Self-lubricating liners must be resistant to damage during use, as well as during the assembly process. Self-lubricating liners must be able to withstand the heat and pressure that may be associated with use. They must also be resistant to a variety of substances, including mild acids, alcohols, oils, and water.
It is also known in the art to produce bearings containing a fibrous surface liner containing polytetrafluoroethylene (PTFE) with polymeric fibers and a resin. The PTFE fibers adhere to the resin and provide a low coefficient of friction, thus minimizing wear. For example, U.S. Pat. No. 4,074,512, to Matt, discloses a resin-impregnated PTFE fabric for use in bearing applications. Fibrous material, such as carbon, glass fibers, aramid, or other common polymer fibers, may be added as well to self-lubricating liners to increase strength and inhibit wear. Such fibers are desirable to be interwoven with the PTFE to increase the compressive strength of the fibrous composite. Brittle fibers, particularly glass and carbon fibers, may tend to break either during the bearing manufacturing process or during use. Some common polymer fibers used as liner reinforcement are known to creep under load or thermally break down when subjected at elevated temperatures and compressive loads. Accordingly, an improved self-lubricating liner having increased durability and ability to withstand increased temperature and pressure is desirable.
REFERENCES:
patent: 4074512 (1978-02-01), Matt
patent: 4232436 (1980-11-01), Chmura
patent: 4277118 (1981-07-01), McCloskey
patent: 4655944 (1987-04-01), Mori
patent: 4674164 (1987-06-01), McCloskey
patent: 4867889 (1989-09-01), Jacobson
patent: 4892669 (1990-01-01), Marcora et al.
patent: 5137986 (1992-08-01), Uy
patent: 5427698 (1995-06-01), Hirokawa et al.
patent: 5821204 (1998-10-01), Kato et al.
patent: 5952067 (1999-09-01), Head
patent: 5962376 (1999-10-01), Yamazaki et al.
patent: 5989375 (1999-11-01), Bortz
patent: 6068931 (2000-05-01), Adam et al.
McAvoy Ellen M.
New Hampshire Ball Bearings, Inc.
Pillsbury & Winthrop LLP
LandOfFree
Self-lubricating liner using poly... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-lubricating liner using poly..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-lubricating liner using poly... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2881078