Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1995-01-09
1996-11-26
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
2003022, H01H 1370
Patent
active
055788025
ABSTRACT:
A keypad structure includes a printed circuit board with a plurality of miniature push-button switches mounted thereon in a predetermined array with the operating surfaces of the buttons substantially in a common plane. An array of holes is formed in a layer material termed a spacer member which is releasably secured to the pcb with the wall defining each hole surrounding a corresponding switch. A plurality of openings is formed in a template sheet which is adhesively secured to the spacer member. The openings in the template sheet are of larger diameter than the holes in the spacer member and provide a positioning guide for dome-type spring members which are supported on the spacer member and overlie the respective operating surfaces of the switch buttons. A flexible, outer sheet is adhesively secured to the outer surface of the template sheet, capturing the springs between the spacer member and the outer sheet. The switches are individually operable by manual pressure applied to selected areas of the outer sheet and repairs may be performed by detaching the pcb from the spacer member.
REFERENCES:
patent: 3657492 (1972-04-01), Arndt et al.
patent: 3890480 (1975-06-01), Berling et al.
patent: 4071718 (1978-01-01), Harden
patent: 4293764 (1981-10-01), Amrhein
patent: 4385213 (1983-05-01), Larson
patent: 5359166 (1994-10-01), Elsaesser et al.
patent: 5453586 (1995-09-01), Sttotmann
McGuire Charles S.
Scott J. R.
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