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High security lock

  • US 6,073,469 A
  • Filed: 06/07/1995
  • Issued: 06/13/2000
  • Est. Priority Date: 06/01/1993
  • Status: Expired due to Fees
First Claim
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1. A high security lock, comprising:

  • a shackle having a middle portion and two ends;

    a lock body having openings therein for receiving said ends of said shackle;

    a latch having a catch movable into engagement with said shackle for securing at least one end of said shackle in said body and which is releasable to allow said one end of said shackle to move clear of said body;

    wherein said shackle is a U-shaped rod of primarily monolithic shape memory effect metal having a yield strength that increases when work is impressed on said shape memory effect metal and said shackle is accordingly difficult to cut or break with common tools.

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