Long travel, high force combination spring

Spring devices – Reciprocating-bed-cushioning devices

Reexamination Certificate

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Details

C267S169000, C267S289000, C267S291000

Reexamination Certificate

active

10936213

ABSTRACT:
A long travel, varying spring rate combination spring includes two differing rate springs connected end-to-end in such a way that the lower rate spring is compressed until positive engagement of a plunger with an intermediate flange member occurs with the higher rate spring thereafter compressed. Each spring may be assembled separately and connected together with a coupling to create a combination spring, allowing various springs to be combined to meet the requirements of a particular application.

REFERENCES:
patent: 48084 (1865-06-01), Murray
patent: 932489 (1909-08-01), Murrey
patent: 2437631 (1948-03-01), Wood
patent: 2688884 (1954-09-01), Warmoes et al.
patent: 3556504 (1971-01-01), Sinclair
patent: 3559976 (1971-02-01), Jerz, Jr.
patent: 3603610 (1971-09-01), Thompson
patent: 3814524 (1974-06-01), Sperti
patent: 3862751 (1975-01-01), Schwaller
patent: 4033542 (1977-07-01), Moehle et al.
patent: 4905574 (1990-03-01), Trevisan
patent: 5263695 (1993-11-01), Bianchi
patent: 5390903 (1995-02-01), Fidziukiewicz
patent: 56-83633 (1981-07-01), None
International Search Report of the International Searching Authority for PCT Application PCT/US2005/031389, dated Apr. 24, 2006.

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