Signaling device for detecting the presence of an object

A - Human Necessities – 61 – G

Patent

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A61G 7/05 (2006.01) A47C 31/00 (2006.01) B60R 21/015 (2006.01) G08B 21/22 (2006.01) H01H 9/00 (2006.01)

Patent

CA 2720861

sheet switch (142) has a bottom layer (144) and a top layer (160). First and second conductors (148, 162) located on the bottom layer (144) form two separate conductive paths, with a voltage potential applied to the conductors (148, 162). The top layer (160) includes a ground conductor (172). Spacers (178) are positioned between the top and bottom layers (160, 144). When forces are externally applied, the spacers (178) collapse and the ground conductor (172) contacts the first and second conductors (148, 162), and establishes a conductive path therebetween.

Un contacteur fin (142) comporte une couche inférieure (144) et une couche supérieure (160). Des premier et deuxième conducteurs (148, 162) situés sur la couche inférieure (144) forment deux chemins conducteurs séparés, une tension étant appliquée à ces conducteurs (148, 162). La couche supérieure (160) comprend un conducteur de masse (172). Des intercalaires (178) sont positionnés entre les couches supérieure et inférieure (160, 144). Lorsque des forces sont appliquées de l'extérieur, les intercalaires (178) s'affaissent et le conducteur de masse (172) touche les premier et deuxième conducteurs (148, 162) et établit un chemin conducteur entre eux.

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