Combination padlock
AssigneePresto Lock Company, Division of Walter Kidde & Company, Inc.
InventorsLazlo Bako, Rudolf Wingert
Life of this patent
Estimating the term…
Abstract
A combination padlock has a plurality of permutation tumblers mounted on a ember shiftable in a cavity in the body of the lock to effect a change in combination. Limit means cooperate with the tumblers for preventing the member from being shifted except when the tumblers are set in the correct combination. The member can be shifted in response to movement of the shackle of the padlock, but only when the lock is open. The bolt of the padlock and the shackle are designed to permit the tumblers to be scrambled when the lock is open, thus concealing the correct combination from unauthorized persons, and preventing the combination from being changed while the lock is open.
Claims18
A combination padlock comprising:
- a. a body having an internal cavity;
- b. a plurality of rotatable permutation tumblers;
- c. a shiftable member in the cavity for changing the combination of the tumblers;
- d. a shackle having a long leg extending into the cavity and rotatable on the body about the axis of the leg, the leg being shiftable in the body along its axis between retracted and extended position;
- e. a bolt cooperable with the tumblers for preventing the leg, when it is retracted in a first angular position, from being shifted to its extended position except when the tumblers are set on open combination;
- f. means enabling the combination to be scrambled when the leg is in its extended position;
- g. means provided by the shackle for shifting the shiftable member;
- and
- h. means for preventing shifting of the shiftable member except when the tumblers are set in the open combination.
A combination padlock comprising:
- a. a body with an internal cavity;
- b. a shackle having a long leg extending into the cavity and rotatable in the body about its longitudinal axis, the leg being shiftable in the body along the axis thereof between retracted and extended positions;
- c. a pivotal bolt in the cavity;
- d. a plurality of rotatable tumblers;
- e. a spring means urging the bolt into engagement with the tumblers which, when off combination and the leg is retracted in a first angular position, holds the bolt in an operative position at which a locking portion engages the shackle and prevents the leg from moving to extended position;
- f. the spring means being effective to pivot the bolt and disengage the locking portion from the shackle when the tumblers are set to open combination and the leg is retracted in a first angular position for allowing the leg to be moved to its extended position;
- and
- g. said spring means serving as a fulcrum for the bolt as well as a bias therefor.
Dependencies are inferred from the claim text.