Title: Pushbutton arrangement

Abstract: A pushbutton, particularly a key of a keyboard, comprises an upper part for operation by finger touch and a lower part serving to operate an activating member, such as an electrical contact, the lower part being constructed with two surface portions of different inclination to the direction of movement of the pushbutton, said surface portions being engaged by a spring wire so as to create a sudden drop of the restoring spring force when the spring wire passes from the more inclined surface portion to the less inclined surface portion.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Albrechtsen, Kaj (Virum, DK)

Application Number: 810725
Filing Date: 1977-06-28
Publication_date: 1979-03-20
Assignee: GNT Automatic A/S (Solborg, DK)
Primary Class(es): 200/341
Other Classes:
US Patent Ref:

2951926	Sep, 1960	Frantz et al.	200/159.
3193607	Jul, 1965	Anderson	200/159.
3551614	Dec, 1970	Babler	200/159.
3697706	Oct, 1972	Huggard	200/276.
3732387	May, 1973	Berry	200/276.
3743798	Jul, 1973	Pentecost	200/159.

Other Refs: 9339491155505

May, 1948	FR
Jun, 1969	GB

Primary Examiner: Price, William
Assistant Examiner: Moy, Joseph M.
Attorney: Watson, Cole, Grindle & Watson