Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1979-11-19
1982-01-26
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
24208A, 24297, 411 41, 411508, A44B 1700, F16B 1304
Patent
active
043126146
ABSTRACT:
There is described a tamper-proof fastener for use in security applications, the fastener comprising inner and outer members interconnected by flexible straps. The inner and outer members each comprise a leading end, a shank, and a trailing end, the shank of the outer member consisting of two substantially parallel legs defining between them an open-sided passage which contracts towards the leading end, and the leading end of the outer member consisting of two limbs which define between them an open-sided space and converge to a tip where they are interconnected, each limb being connected to a respective leg and presenting an external shoulder facing away from the tip and an internal shoulder facing towards the tip, the trailing end of the outer member including outwardly extending portions presenting an external shoulder facing the leading of the outer member. The inner member is initially positioned so that its leading end lies in the open-sided passage, the leading of the inner member is capable of moving longitudinally to a position within the leading end of the outer member, shoulders formed on the leading end of the inner member then engaging the internal shoulders of the outer member to resist removal of the leading end of the inner member from the leading of the outer member.
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Harris Richard J.
Palmer John P.
Piper Alfred E. C.
Buckman T. W.
Halvorsen J. R.
Holko Thomas J.
ITW Limited
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