Locks – Operating mechanism – Combination
Patent
1995-08-04
1996-11-19
Gall, Lloyd A.
Locks
Operating mechanism
Combination
70302, 70309, E05B 3708
Patent
active
055751644
ABSTRACT:
A combination lock includes a dial shaft adapted to be rotated with a user's hand, a fore lock plate, at least one intermediate lock plate and a rear lock plate arranged in parallel with each other, and a driving plate integrally fitted to a rear end of the dial shaft. A plurality of unlocking cutouts are formed in the outer peripheries of the driving plate and all the lock plates so as to allow a lock pawl to be received in the unlocking cutouts when the latter are located in alignment with each other. A driving gear having a large diameter is formed in the driving plate, and a follower gear having a small diameter is formed on the fore lock plate. Both the gears mesh with each other at a gear ratio via an idler gear so as to allow the gears to be rotated in the opposite directions. The gear ratio is determined such that all the lock plates are followably rotated as a dial knob is turned with a user's hand. Usually, the number of lock plates is four, the gear ratio of the driving gear to the follower gear is set to 3:1.
REFERENCES:
patent: 3196643 (1965-07-01), Moss
patent: 4106316 (1978-08-01), Tippin
patent: 4694670 (1987-09-01), Jang
Gall Lloyd A.
K I International Co., Ltd.
Santos Robert G.
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