Pressure activated switching device
First Claim
Patent Images
1. A pressure activated switching device which comprises:
- a) a planar first conductive layer;
b) a planar second conductive layer spaced apart from the first conductive layer so as to define a planar space therebetween;
c) a stand-off between the first and second conductive layers, the standoff including at least two monolithic insulative members, each monolithic insulative member including at least two intersecting linear portions, the monolithic insulative members being arranged such that no portion of the planar space between the first and second conductive layers is completely surrounded by any one of the insulative members.
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Abstract
A pressure activated switching device includes an electrically insulative standoff positioned between two conductive layers. The standoff is preferably a polymeric or rubber foam configured in the form of contoured shapes having interdigitated lateral projections. Optionally, the switching device can include a piezoresistive material positioned between a conductive layer and the standoff. The pressure activated switching device can be used, for example, in a safety sensing edge system for a movable door.
110 Citations
34 Claims
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1. A pressure activated switching device which comprises:
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a) a planar first conductive layer; b) a planar second conductive layer spaced apart from the first conductive layer so as to define a planar space therebetween; c) a stand-off between the first and second conductive layers, the standoff including at least two monolithic insulative members, each monolithic insulative member including at least two intersecting linear portions, the monolithic insulative members being arranged such that no portion of the planar space between the first and second conductive layers is completely surrounded by any one of the insulative members. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pressure activated switching device which comprises:
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a) a first conductive layer; b) a second conductive layer; c) a standoff between the first conductive layer and the second conductive layer, said standoff including a first strip of an electrically insulative material having a longitudinally oriented linear first portion and a plurality of spaced apart linear first projections extending laterally from the first portion and each of the first projections having an end, a second strip of the electrically insulative material having a longitudinally oriented linear second portion and a plurality of spaced apart linear second projections extending laterally from the second portion and each of the second projections having an end, said first and second strips not crossing over each other, wherein at least two of the first projections of the first strip extend towards the second portion of the second strip, the respective ends of the first projections being spaced apart from the second portion of the second strip, and wherein at least two of the second projections of the second strip extend towards the first portion of the first strip, the respective ends of the second projections being spaced apart from the first portion of the first strip. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A safety sensing edge system for a door comprising:
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a) a pressure activated switching device which includes, i) a first conductive layer; ii) a second conductive layer; iii) a standoff between the first conductive layer and the second conductive layer, said standoff including a first strip of an electrically insulative material having a longitudinally oriented linear first portion and a plurality of spaced apart linear first projections extending laterally from the first portion and each of the first projections terminating in an end, a second strip of the electrically insulative material having a longitudinally oriented linear second portion and a plurality of spaced apart linear second projections extending laterally from the second portion and each of the second projections terminating in an end, said first and second strips not crossing over each other, wherein at least two of the first projections of the first strip extend towards the second portion of the second strip, the respective ends of the first projections being spaced apart from the second portion of the second strip, and wherein at least two of the second projections of the second strip extend towards the first portion of the first strip, the respective ends of the second projections being spaced apart from the first portion of the first strip; b) a cover for enclosing the pressure activated switching device; c) a bracket for mounting the pressure activated switching device. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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Specification