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Signalling device

  • US 4,224,602 A
  • Filed: 12/04/1978
  • Issued: 09/23/1980
  • Est. Priority Date: 12/04/1978
  • Status: Expired due to Term
First Claim
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1. A manually-actuated signalling device, comprising:

  • a first housing;

    a signalling circuit assembly disposed within the first housing and including a signalling circuit and a depressible pressure sensitive switch operative when depressed to actuate the signalling circuit; and

    a second housing cooperating with the first housing for fully enclosing the signalling circuit assembly within the first and second housing;

    said second housing including a resilient semi-rigid deflective wall having an indentation therein extending in the direction of the first housing and physically adjacent to the pressure sensitive switch, said indentation being capable of being manually depressed and, when depressed, to deflect the wall of the housing and physically touch the pressure sensitive switch to transmit the pressure applied to the indentation to the pressure sensitive switch to cause depression of the switch and actuation of the signalling circuit, said indentation in the wall of the second housing and the pressure sensitive switch being arranged with respect to each other so that depression of the switch and actuation of the signalling circuit can occur only in response to pressure being applied to the indentation in the wall of the second housing, said semi-rigid deflective wall being operative upon release of the pressure applied to the indentation to return to its original position; and

    said second housing further including upstanding ridge members integral with the semi-rigid deflective wall and spaced from the indentation in the semi-rigid deflective wall for facilitating the location of the indentation in the deflective wall, for spacing the deflective wall and the indentation therein from a surface against which the signalling device may be placed, and for absorbing the effects of impact of the signalling device against a surface, thereby reducing the possibility of false actuation of the pressure sensitive switch.

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