Tamper-proof set screw assemblage for locking devices

Details Tamper-proof set screw assemblage for locking devices Tamper-proof set screw assemblage for locking devices

1975-08-25

1976-08-31

Wolfe, Robert L.

Locks

Special application

For portable articles

70258, 280507, E05B 7300

Patent

active

039772217

ABSTRACT:
In certain types of locking devices a lockable, tool operated set screw is utilized to impingingly hold a pair of elements together. It is intended that the set screw cannot be operated unless it is unlocked and a tool is applied to a portion thereof. However, tamperers have discovered that a flexible cord or the like inserted into a crevice between the impinged elements and wrapped about a threaded shank portion of the set screw, can be effective for unauthorizedly turning the set screw to release the members held together by the set screw. To overcome this type of tampering the present invention provides a set screw in which the threads on its extreme outer end portion are eliminated and said portion of the set screw shank carries a freely turnable sleeve. Hence, should a tamperer apply a flexible cord or appliance to the accessible portion of the set screw (that which carries the turnable sleeve), pulls on the cord will only result in free turning of the sleeve without any turning of the set screw. Additional means are also provided for holding the sleeve on the set screw and for preventing such undue projection of the set screw which might cause it to be dislodged from the member into which it is threaded and into a cavity in the companion member.

REFERENCES:
patent: 2424871 (1947-07-01), Wenk
patent: 3410580 (1968-11-01), Longennecker
patent: 3526110 (1970-09-01), Foote

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