Binary coded key and tamper resistant latch

Details Binary coded key and tamper resistant latch Binary coded key and tamper resistant latch

2007-09-14

2008-10-28

Gall, Lloyd A (Department: 3673)

Locks

Special application

For closures

C070S128000, C070S404000, C070S417000, C070S419000, C070S491000, C292S057000, C292S058000, C292S064000, C292S067000

Reexamination Certificate

active

07441427

ABSTRACT:
A latch has a bushing which has at least one bushing projection or means for preventing insertion of an unauthorized tool to rotate a latch actuator of the latch. Only a key having an outer key recess which can mate with bushing projection on the bushing permits insertion of the key. The cap subassembly of the latch is provided with projections which are of a size and so positioned as to correspond with the internal recesses of the key so as to allow the cap subassembly to enter into the bore of the key and permit a mating engagement of internal recesses on the key and projections on the cap subassembly. Because cap portion rotates freely on top of the cap subassembly which is the part of the cap driven by the key, the arrangement makes it impossible, or at least very difficult, to rotate the shaft and in turn the pawl by means of a tool which rotates the cap portion.

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Southco Handbook 2000 by Southco, Inc., 1999, pp. 28, 29, 36, 37, 112 and 113.
Product Description by Strattec Security Corporation, dated 1997.
Southco Latches and Hardware Handbook 45, NA, by Southco, Inc., 1995, pp. E-8, E-9, G-16, and G-17.
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Emka, General Catalogue 2007, pp. 7, 11-15, 17-26, 28-61.

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