Spring devices – Bendable along flat surface – Bow spring or superposed spring elements
Patent
1997-09-11
2000-02-15
Freay, Charles G.
Spring devices
Bendable along flat surface
Bow spring or superposed spring elements
267148, 417472, 417559, F16F 136, F04B 4302, F04B 3910
Patent
active
060243457
ABSTRACT:
The present invention relates to a resin-made spring which, although the spring is made of a resin only, has a strength similar to that of a metal-made spring, and in which the strength is hardly reduced with time and can be maintained to a desired degree for a long term, and also to a bellows type constant volume pump which uses such a resin-made spring. The resin-made spring of the present invention has a configuration in which a strip-like PTFE-made sheet is bent in a zigzag manner in a longitudinal direction of the sheet to thereby provide a predetermined swelling curvature R, side faces of bent portions of the predetermined curvature are in close proximity to or in contact with each other, and the bent portions of the predetermined curvature are elastically expandable and contractible by means of heat holding and cooling. Such a PTFE-made spring is used as a spring for a check valve on the side of a tip end portion of a discharge hole of a bellows type constant volume pump.
REFERENCES:
patent: 5013013 (1991-05-01), Spedding
patent: 5438472 (1995-08-01), Oh
patent: 5772413 (1998-06-01), Oshidari
patent: 5803441 (1998-09-01), Yamamoto
Freay Charles G.
Gartenberg Ehud
Nippon Pillar Packing Co. Ltd.
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