F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 43/02 (2006.01) F04B 43/00 (2006.01) F04B 53/00 (2006.01)
Patent
CA 2233273
The present invention provides a combination pump diaphragm and outer piston arrangement used in certain pump applications in which at least a predetermined portion of such diaphragm is in contact with such outer piston which would tend to abrade such diaphragm. The combination comprises a diaphragm member formed from at least one layer of a flexible material selected from a group comprising EPDM, chloroprenes, nitrile rubbers fluoroelastomers and various mixtures thereof. Such diaphragm member includes a generally flat portion, a generally flexure annular portion and an enlarged bead like wear ring portion disposed intermediate such generally flat portion. Such generally flexure annular portion has a first predetermined diameter and a predetermined configuration. The present invention further includes a means for securing such outer periphery of such diaphragm member 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. Such outer piston member does not extend beyond such predetermined configuration of such enlarged bead like wear ring portion of such diaphragm member. There is further a central aperture in such diaphragm member and such outer piston member for attaching such combination pump diaphragm and outer piston arrangement to a piston rod of a pump.
Eady Eldon S.
Stephenson Larry J.
Macrae & Co.
Westinghouse Air Brake Company
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