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Sensor strip

  • US 4,944,116 A
  • Filed: 08/30/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 09/01/1988
  • Status: Expired due to Fees
First Claim
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1. A sensing strip for a movable member having an edge and a drive for said movable member, said sensing element comprising:

  • an elongated hollow elastically deformable body extending along said edge;

    a support connecting said body to said edge and extending therealong;

    a hollow light guide profile formed in said body at a side thereof opposite said support and constituting a leading edge portion with said hollow body, said hollow light guide profile being provided with a slit within said body whereby a light from said light beam traversing said hollow light guide profiles can escape upon spreading of said slit;

    a light source generating said light beam at one end of said body directing said light beam into said hollow light guide profiles; and

    a light receiver operatively connected to said drive for controlling same and disposed to receive said light beam in an undeformed state of said body, whereby a deformation force applied to said body spreads said slit and reduces light reaching said receiver.

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