Expansible chamber devices – Collapsible chamber wall portion – Wall portion formed of flexible material
Patent
1997-11-18
1999-12-07
Nguyen, Hoang
Expansible chamber devices
Collapsible chamber wall portion
Wall portion formed of flexible material
92103R, 92100, F01B 1900
Patent
active
059964707
ABSTRACT:
A combination pump diaphragm and outer piston arrangement used in certain pump applications in which at least a portion of such diaphragm is in contact with an outer piston which would tend to abrade the diaphragm. The combination comprises a diaphragm member which includes a generally flat portion, a generally flexure annular portion and an enlarged bead like wear ring portion disposed intermediate such generally flat portion and such generally flexure annular portion. Such bead like wear ring portion has a first predetermined diameter and a predetermined configuration. The outer periphery of such diaphragm member is secured to a pump housing. An outer piston member is disposed for securing such diaphragm member to a piston rod of a pump. Such outer piston member includes a generally flat portion contacting such generally flat portion of such diaphragm member and an arcuate portion contacting such enlarged bead like wear ring portion. The outer piston member does not extend beyond the predetermined configuration of the enlarged bead like wear ring portion of such diaphragm member.
REFERENCES:
patent: 4887516 (1989-12-01), Scott et al.
patent: 5220863 (1993-06-01), Scott et al.
patent: 5291822 (1994-03-01), Alsobrooks et al.
patent: 5724881 (1998-03-01), Reynolds
patent: 5743169 (1998-04-01), Yamada
Eady Eldon S.
Stephenson Larry J.
Nguyen Hoang
Westinghouse Air Brake Company
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