Method and apparatus for a rekeyable master key lock
AssigneeSpectrum Brands, Inc.
InventorMARK W. EMORY
Life of this patent
Estimating the term…
Abstract
A rekeyable master lock includes a plurality of pin gears, with each pin gear engaged with a corresponding key follower. As each key follower rides up and down on the key biting, it causes a corresponding pin gear to rotate. Each pin gear engages a user gear and a master gear so that, as the pin gear rotates, the user and master gears rotate. Each user and master gear, in turn, drives a corresponding user rack and a master rack. When a valid user key is inserted and rotated, the user racks or master racks are aligned along a common axis and held in alignment by a locking bar. Longitudinal movement of the user gear or master gear allows the rekeying function by decoupling and recoupling the user gear or master gear with the user racks or master racks.
Claims22
A method of rekeying a master keyable lock comprising the steps of:
- providing a plug assembly rotatable within a housing;
- providing a plurality of key followers disposed in the plug assembly;
- providing a plurality of user racks and a plurality of master racks disposed in the plug assembly, each of the plurality of user racks and plurality of master racks being coupled to an associated key follower and movable in response to movement of the associated key follower;
- inserting a first key with a first key bitting;
- aligning one of the plurality of user racks and plurality of master racks to a common axis;
- decoupling the one of the plurality of user racks and plurality of master racks from the plurality of key followers;
- removing the first key and inserting a second key with a second key bitting;
- and
- recoupling the one of the plurality of user racks and plurality of master racks to the plurality of key followers.
A method of rekeying a masterkeyable lock cylinder having a longitudinal axis comprising the steps of:
- providing a plurality of gears;
- providing a plurality of racks coupled to the plurality of gears;
- inserting a first key with a first key bitting;
- maintaining the plurality of racks aligned along a common axis;
- displacing the gears parallel to the longitudinal axis to decouple the plurality of gears from the plurality of racks;
- replacing the first key with a second key with second key bitting;
- and
- displacing the plurality of gears in a direction parallel to the longitudinal axis to recouple the plurality of gears with the plurality of racks.
A master keyable rekeyable lock having a longitudinal axis, the lock comprising:
- a housing;
- a plug assembly disposed for rotation within the cylinder housing;
- a plurality of key followers disposed in the plug assembly;
- a first plurality of racks disposed in the plug assembly and coupled to the plurality key followers;
- a second plurality of racks disposed in the plug assembly and coupled to the plurality key followers;
- and
- a locking bar disposed in the housing for selectively engaging one of the first plurality of racks and the second plurality of racks.
A master keyable rekeyable lock comprising:
- a plurality of key followers;
- a first plurality of gears coupled to the key followers;
- a first plurality of racks coupled to the plurality of gears;
- an first encoder coupled to the first plurality of gears and including means for moving the first plurality of gears to decouple the first plurality of gears from the first plurality of racks;
- and
- a first encoder latch coupled to the first encoder to maintain the first plurality of gears decoupled from the first plurality of racks.
A master keyable rekeyable lock having a longitudinal axis, the lock comprising:
- a housing;
- a plug assembly disposed for rotation within the cylinder housing;
- a plurality of key followers disposed in the plug assembly;
- a first plurality of racks disposed in the plug assembly and coupled to the plurality key followers;
- a second plurality of racks disposed in the plug assembly and coupled to the plurality key followers;
- and
- a locking bar configured to selectively engage one of the first plurality of racks and the second plurality of racks.
Dependencies are inferred from the claim text.