Piston, method of producing the piston, and pump having the...

Details Piston, method of producing the piston, and pump having the... Piston, method of producing the piston, and pump having the...

2007-03-26

2009-11-10

Lazo, Thomas E (Department: 3745)

Expansible chamber devices

Collapsible chamber wall portion

Wall portion formed of flexible material

C029S888047

Reexamination Certificate

active

07614338

ABSTRACT:
A piston1which is to be movably supported in a cylinder11of a pump10to be reciprocally driven is formed by a fluororesin so that it is not impaired by a corrosive liquid. A cylindrical outer peripheral portion2of the piston1has a thickness of 1 mm or less, and is flexible. The outer peripheral portion has a flange portion7in an open end portion via an approximately 180-degree folded-back portion3. The flange portion7is attached to the cylinder11. When the pump10is driven, the cylindrical outer peripheral portion2of the piston1smoothly rolls without producing deflections or bends in a gap between the outer peripheral face of a piston support member15and the inner peripheral face of the cylinder11, while being in close contact with the two faces.

REFERENCES:
patent: 2849026 (1958-08-01), Taplin
patent: 4056043 (1977-11-01), Sriramamurty et al.
patent: 4749342 (1988-06-01), Fritsch
patent: 4773305 (1988-09-01), Nissels
patent: 5452993 (1995-09-01), Lanigan
patent: 6079959 (2000-06-01), Kingsford et al.
patent: 7293967 (2007-11-01), Fukano et al.
patent: 61-197779 (1986-09-01), None
patent: 9-53566 (1997-02-01), None

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