Textiles: fiber preparation
Patent
1974-05-17
1976-02-17
Burr, Edgar S.
Textiles: fiber preparation
178 17C, 340365R, B41J 508
Patent
active
039386422
ABSTRACT:
The "touch" or "feel" of a key in a keyboard is controlled by a system of permanent magnets. A first magnet is attached to one end of a key lever and the key lever is pivoted intermediate its ends. A bias spring is provided to normally bias the key lever against a stop. A second magnet is disposed adjacent the path of movement of the first magnet whereby the force required to depress the key lever is dependent upon the spring constant and the interaction of the fields of the magnets. The magnets are positioned such that, as the lever is depressed there is a repelling force between the magnets. Thus, the force required to depress the key is the sum of the spring bias force and the repelling force between the magnets as the first magnet is moved from the home position to a position opposite the second magnet, but is the difference between the spring bias force and the repelling force between the magnets as the key is further depressed.
REFERENCES:
patent: 3363737 (1963-01-01), Wada et al.
patent: 3690432 (1972-09-01), Kikuchi et al.
patent: 3696908 (1972-10-01), Gluck et al.
patent: 3797630 (1974-03-01), Zilkha
patent: 3831730 (1974-08-01), Koeppe
Stillings et al., "Magnetic Actuator Key Mechanism", IBM Tech. Disc. Bull., Vol. 15, No. 9, Feb. 1973.
Sulich et al., "Magnetic Key Mechanism", IBM Tech. Disc. Bull., Vol. 15, No. 7, Dec., 1972.
Spermon Joop A.
Van Rumpt Jaap
Burr Edgar S.
Rader R. T.
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