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Safety beading

  • US 4,519,474 A
  • Filed: 09/06/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 09/13/1982
  • Status: Expired due to Fees
First Claim
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1. A safety beading which is arranged along the shock-absorbing edges or closing edges of an automatically movable contrivance comprising:

  • an electric switching arrangement;

    said electric switching arrangement comprising a plurality of contact elements;

    each of said contact elements possessing a contact point;

    an elastic tube which is prestressed along its length;

    said contact elements being disposed in series in said elastic tube, so that the contact elements are pressed together at said contact points thereof when in a normal inoperative position by the action of the pre-stressing of the tube; and

    said contact elements comprise insulated edges which touch during the transition to an operative position under the action of an external force, whereby the contact elements perform a rocking movement against one another and contact is interrupted.

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