Locks – Portable – Padlocks
Patent
1976-09-03
1977-09-13
Wolfe, Robert L.
Locks
Portable
Padlocks
70416, E05B 3704
Patent
active
040474062
ABSTRACT:
In a popular form of changeable combination padlock there is a pivotally mounted, spring urged blocking lever whose lower end portion is pivotally associated with the clutch elements for the dialing wheels and whose upper end portion engages a pair of shackle locking bolts when the shackle is retracted and locked holding the locking bolts in a so-called "dead-bolt" condition. The last mentioned portion of the blocking lever is free to move, however, within a cavity in the lock case and bolt housing to disengage and release said locking bolts when the permutation mechanism is correctly operated for shackle unlocking purposes. In a changeable combination padlock of the type under consideration the cavity within the case wherein the upper portion of the blocking lever can move, is relatively commodious. In practice it has been found that a thief or tamperer, by pressing down on a portion of the shackle and rapping on a face of the padlock case with a tool or the like, can unauthorizedly impart vibrations to said blocking lever of such magnitude, permitted by the commodious cavity which accommodates said blocking lever portion as to permit disengagement of said blocking lever portion from the shackle locking bolts whereby the lock may be unauthorizedly unlocked with the dialing mechanism being bypassed. To overcome this disadvantage the present invention so mounts the described movable portion of the blocking lever within such a restricted cavity that rapping or like tampering actions by a thief or the like will be completely ineffectual to cause such vibratory movements of the blocking lever portion as would be sufficient to free it from the shackle locking bolts.
REFERENCES:
patent: 2163852 (1939-06-01), Pond
patent: 3419893 (1968-12-01), Vahlstrom
patent: 3766758 (1973-10-01), Heine
patent: 3983724 (1976-10-01), Foote
Master Lock Company
Morsell, Sr. Curtis B.
Wolfe Robert L.
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