Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1985-01-22
1987-08-25
Caldwell, Sr., John W.
Communications: electrical
Audible indication
Percussion-type sound producer
340365R, 200 5A, G08C 900
Patent
active
046896082
ABSTRACT:
In the preferred embodiment of the invention, the snap actuator is an angled magnetically permeable plate. One leg of the angled plate is attracted to a strip magnet placed on a circuitboard. This particular portion of the plate also has two spring fingers that make contact with spherical or domed contacts on the circuitboard or, in the alternative, have formed dome portions in the end of each finger for contacting flat contacts on the circuitboard so that a wiping action that is resistant to contamination results. The other leg of the angled plate serves as a lever arm to which key button pressure is applied. The angle between the plates or the edge of the strip magnet serves as a fulcrum for pivoting the plate under the influence of key pressure. When key pressure has built up sufficiently, the magnetic attraction is substantially broken and the angled plate is suddenly released, thereby breaking contact with the circuit contacts and allowing the circuit voltage to be sensed.
REFERENCES:
patent: 4341934 (1982-07-01), Muller
patent: 4529849 (1985-07-01), Kamei et al.
"Spring and Magnet Keyboard Actuator" by K. A. Lennon, IBM Technical Disclosure Bulletin, vol. 24, No. 8, Jan. 1982, pp. 4314-4315.
"Push Button Switch" by G. L. Spahn of Western Electric, Technical Digest, No. 53, Jan. 1979, pp. 23-24.
"Braille Readout Pocket Calculator" by R. A. Bartels, IBM Technical Bulletin, vol. 17, No. 8, Jan. 1975, pp. 2471-2472.
"Magnetic Snap-Acturation Keyboards" by Bolda et al, IBM Technical Bulletin, vol. 26, No. 6, Nov. 1983.
Bolda Frank J.
McKnight John P.
Sturm Russell J.
Caldwell Sr. John W.
Duffield Edward H.
International Business Machines - Corporation
Queen Tyrone
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