Key spring

Details Key spring Key spring

1983-09-07

1988-12-27

Halvosa, George E. A.

Spring devices

Bendable along flat surface

Bow spring or superposed spring elements

267 47, F16F 120

Patent

active

047936010

ABSTRACT:
In order to save space and manufacturing costs a pull-off effect for the operation of a key should be achieved by using a single spring. Thus the spring must have an arc-like force vs. displacement characteristic having a maximum of force about on half-way of the key stroke. This is achieved by a meander-like shaped spring (1) of flat material having two end loops (2, 3) of equal height and one middle loop (4) of about twice this height, all these loops lying within the same plane. The mounted spring is pretensioned in two directions being perpendicular to each other and lying in said plane, the operating force being applied to the top (7) of the middle loop.

REFERENCES:
patent: 1250549 (1917-12-01), Bowman
patent: 1256124 (1918-02-01), Gelling
patent: 1792343 (1931-02-01), Wikander
patent: 1958778 (1934-05-01), Balduf
patent: 2680641 (1954-06-01), Schonitzer
patent: 4112284 (1978-09-01), Leworthy
patent: 4301345 (1981-11-01), Balta

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