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Lock and tool therefor

  • US 5,732,989 A
  • Filed: 06/14/1996
  • Issued: 03/31/1998
  • Est. Priority Date: 06/14/1996
  • Status: Expired due to Fees
First Claim
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1. A tamper resistant lock for locking a bolt having a shank with at least one locking recess, said lock comprising:

  • a body having a cavity with an opening defining a bolt receiving axis for axially receiving the bolt and said at least one recess within said cavity;

    at least one resiliently movable jaw in said cavity resiliently biased radially inwardly by a first bias means; and

    displaceable jaw locking means including a jaw locking and release member secured in said body cavity for 1a) permitting said at least one movable jaw to transversely displace radially outwardly relative to said axis in response to and for permitting bolt insertion into said cavity in a bolt insertion direction, b) providing radially inward locking engagement of the at least one movable jaw with said bolt recess upon transverse alignment thereof during said insertion and c) precluding the at least one movable jaw from outwardly disengaging the recess in response to bolt withdrawal opposite the bolt insertion direction in a locking state and

         2) permitting disengagement of the at least one movable jaw from the recess in response to selective axial displacement of the locking means release member in a first direction to a release state;

    said displaceable jaw locking means including second bias means for normally biasing the locking member in said locking state at a substantially greater bias load than that of said first bias means so as to require a separate tool to overcome the bias of said second bias means.

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