| 摘要 |
A safety arrangement in a device for indicating a pressure or force applied to, for example, push-buttons, door edge sensors, pressure sensitive doormats or position detecting equipment in general, said device being of the type which comprises one or more channels (A) in an elastic, electrically insulating material, at least one of said channels containing an electrically conducting fluid through which, in normal operation, an electric current passes and which thereby forms a current path comprised in an electric primary circuit (1, 2, 3) adapted to activate pressure and force responsive means (5), said current being interrupted when the said fluid-containing channel is compressed under the action of an external force displacing the fluid. Said activation is accomplished via a secondary circuit (4) which is operated by the said current path defined between its terminal points and which contains said responsive means (5). |
