Locks – Portable – Padlocks
Patent
1978-02-13
1980-12-02
Wolfe, Robert L.
Locks
Portable
Padlocks
70 52, 70 53, E05B 3706
Patent
active
042363942
ABSTRACT:
A combination lock of the exposed shackle type is disclosed, including means for locking and protecting internal mechanism against tampering and means to foil unauthorized access through improved pivotally offset latch hooks that function independently to tighten into shackle notches and eventually wedge behind provided lugs on the case when latched shackle is pulled outwards. A spring loaded plunger co-operating with a reciprocal center mounting plate having an unlocking bar, a safety unlocking spring and a return locking spring. A central mounting and guide post with square tumbler shaft extending up into a center guide hole in the dial. A plurality of frictionally held combination changeable tumblers assembled upon said square shaft with sequential driving means between dial and tumbler hubs bypassing non-rotatable tumbler separating spacers; each tumbler having a gate at it's periphery to receive a provided fence. Alternate means for stopping dial rotation prior to entry of said fence into said gates as anti-feel and listen out means and alternate means for detaining the dial at each graduation to insure accurate dialing, changing of combination and positive use of a provided master combination means. A two stage opening process to fully release the shackle and erase last number dialed when either the current or master combinations are dialed. A spring loaded releasable shackle holding pin extensible into an aperture in dial underside when zero on dial is rotated to index mark on the case.
REFERENCES:
patent: 2132201 (1938-10-01), Allman
patent: 2830447 (1958-04-01), Miller
Harrington Richard P.
Harrington Russell J.
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