Dust shutter assembly for locks

Details Dust shutter assembly for locks Dust shutter assembly for locks

1994-09-12

1995-11-21

Gall, Lloyd A.

Locks

Parts, attachments, accessories and adjuncts

For key-operated mechanism

70423, 70427, E05B 1718

Patent

active

054676240

ABSTRACT:
An improved dust shutter assembly for locks includes a floating hinge point which decreases the amount of axial key force that is necessary to overcome the spring bias in the dust shutter mechanism. When engaged by a key, the spring retention pin (hinge point) of the dust shutter mechanism moves within the pin slots of the lock plug cavity until it bottoms out against the back of these slots. Pin translation is primarily axial, in the direction of key insertion, which partially unloads the spring and reduces the amount of key force that is required to open the shutter door. Since less key force is necessary, a narrower shutter door can be used. The chief advantage of a narrower shutter door includes a corresponding reduction in the size and length of the entire lock assembly.

REFERENCES:
patent: 2655031 (1953-10-01), Jacobi
patent: 2932186 (1960-04-01), Mahrley
patent: 2993362 (1961-07-01), Baccolla
patent: 3096626 (1962-04-01), Jacobi
patent: 3122013 (1964-02-01), Jacobi
patent: 3367156 (1968-02-01), Johnstone
patent: 4006616 (1977-02-01), Rubner et al.
patent: 4561270 (1985-12-01), Spreng
patent: 4594866 (1986-06-01), Neyret
patent: 4671090 (1987-06-01), Masaki et al.

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