Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1997-06-06
1999-06-01
Nguyen, Hoang
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92103SD, F01B 1900
Patent
active
059079924
ABSTRACT:
The present invention provides an improved diaphragm which will substantially resist detrimental abrasive wear. Such diaphragm being used in certain applications in which at least a portion of such diaphragm moves relative to and is in contact with a nonflexing surface which would tend to abrade and excessively wear such diaphragm. Such diaphragm includes at least one layer of a flexible material. Such at least one layer of such flexible material being selected from a group consisting of EPDM, nitrites, neoprene, fluoroelastomers and various mixtures thereof. This layer of such flexible material has a first predetermined thickness. Such diaphragm further has at least a portion of such at least one layer of such flexible material disposed at least adjacent such nonflexing surface. This portion of the diaphragm has a second predetermined thickness. The second predetermined thickness being greater than such first predetermined thickness. The at least a portion of such at least one layer of flexible material is disposed at least adjacent such nonflexing surface and has such second predetermined thickness positioned on a predetermined side of such diaphragm. Such diaphragm also includes an aperture, having a predetermined diameter, formed through and substantially in a diametric center of such at least one layer of a flexible material and such at least a portion of such at least one layer of such flexible material having such second predetermined thickness.
REFERENCES:
patent: 4864918 (1989-09-01), Martin
patent: 4951554 (1990-08-01), Scott et al.
patent: 5217797 (1993-06-01), Knox et al.
patent: 5291822 (1994-03-01), Alsobrooks et al.
Nguyen Hoang
Westinghouse Air Brake Company
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