Electricity: circuit makers and breakers – Multiple circuit control – Reciprocating contact
Patent
1990-07-20
1992-06-09
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Reciprocating contact
200512, H01H 1502
Patent
active
051209128
ABSTRACT:
A membrane switch is formed of an upper layer of electrically insulating material, a lower layer of electrically insulating material, and an intermediate layer of electrically insulating material interposed between the upper layer of electrically insulating material and the lower layer of electrically insulating material. A first electrically conductive layer is printed upon the lower surface of the upper layer of electrically insulating material. A second electrically conductive layer is printed upon the upper surface of the lower layer of electrically insulating material. A resistive component is printed upon an end portion of the second electrically conductive layer. The intermediate layer of electrically insulating material is provided with an opening so as to enable the first electrically conducting layer to initially engage with the resistive component when the upper layer of electrically insulating material is moved downwardly by means of an actuating member so as to produce an electrical connection between first and second switch terminals of the first and second electrically conductive layers which exhibits low current flow corresponding to a first slidable position of the actuating member, while when the actuating member is slidably moved further in the same direction, direct connection between the first and second electrically conductive layers, without the resistive component being interposed therebetween in a series manner, is established so as to exhibit higher current flow between the first and second electrically conductive layers and within the electrical circuit.
REFERENCES:
patent: 4007364 (1977-02-01), Ojima et al.
patent: 4322588 (1982-03-01), Chumley et al.
patent: 4415781 (1983-11-01), Frame et al.
patent: 4438301 (1984-03-01), Van Zeeland
patent: 4440990 (1984-04-01), Nozaki
patent: 4506118 (1985-03-01), Mollman
patent: 4651123 (1987-03-01), Zepp
patent: 4731509 (1988-03-01), Miyamoto
patent: 4744645 (1988-05-01), Sharp
Illinois Tool Works Inc.
Scott J. R.
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