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Electronic seal

  • US 5,447,344 A
  • Filed: 03/29/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 03/29/1993
  • Status: Expired due to Fees
First Claim
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1. An electronic seal comprising a housing, a flexible element extending from the housing and having a free end which can be passed through a door catch means for releasably connecting the free end of the flexible element to the housing, an electronic circuit within the housing arranged to generate one of a number of unique codes on receipt of an electrical signal and to store the generated code, display means on the housing adapted to display the generated code, and a switch on the housing actuated on connection or disconnection of the flexible element to the housing to provide an electrical signal to actuate the electronic circuit, in which the flexible element is a cord having a series of regularly spaced enlargements, and the means for releasably connecting the free end of the cord to the housing comprises a passage in the housing into which a length of the cord can be inserted, a plurality of teeth in the housing adapted to fit between enlargements of the cord, so that when the length of cord is inserted into the housing each enlargement of the length of cord can fit between two adjacent teeth to hold the cord against withdrawal from the housing, and a slide movable in the housing between a first position in which the cord can be inserted and removed from the passage, and a second position in which the slide retains the enlargements in engagement with the teeth, and the switch has an actuating member projecting between two of the teeth, so as to be engaged by one of the enlargements on the cord when it is engaged between the teeth, so that the switch is actuated when the length of cord is moved into or out of engagement with the teeth.

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