Flat rate spring particularly adapted for typewriter cartridges

Details Flat rate spring particularly adapted for typewriter cartridges Flat rate spring particularly adapted for typewriter cartridges

1980-05-30

1983-01-04

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Package for ribbon facilitating mounting of ribbon on...

400228, 4004342, 267167, B41J 3314

Patent

active

043670520

ABSTRACT:
Disclosed is a spring operating beyond the elastic limit of the material of which it is constructed, the spring including a length of resilient material having terminal end portions and a central body portion, one of the terminal end portions being adapted for connection to a first member. A convoluted portion of the resilient material has a central axis substantially perpendicular to the body portion and is adapted for connection to a second member, at least the convoluted portion being dimensioned so that upon separation of the first and second members due to a predetermined load, the convoluted portion uncoils and is stressed beyond the yield point of the material so that a substantially constant load placed on the convoluted portion by member separation effects further uncoiling of the convoluted portion.

REFERENCES:
patent: 2647743 (1953-08-01), Cook
patent: 2682931 (1954-07-01), Young
patent: 3604549 (1971-09-01), Caudill et al.
patent: 3738634 (1973-06-01), Foster
patent: 3743267 (1973-07-01), Guerster et al.
patent: 3774896 (1973-11-01), Rode
patent: 3964736 (1976-06-01), Huhnen
patent: 3974708 (1976-08-01), F'Geppert
patent: 4010839 (1977-03-01), Guerrini et al.
patent: 4247210 (1981-01-01), Kacmarcik et al.
Spring Design and Applications, "The Negative Spring", Cook et al., McGraw Hill-Nicholas P. Chironis, Copywright 1961, pp. 161-165.

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