Locks – Special application – For closures
Reexamination Certificate
2003-05-28
2004-04-20
Gall, Lloyd A. (Department: 3676)
Locks
Special application
For closures
C070S079000, C070S085000, C292S119000, C292S129000, C292S156000, C292S157000, C292SDIG001, C312S107500, C312S218000, C312S219000
Reexamination Certificate
active
06722167
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to locks and, more particularly, to a cabinet lock for use in a cabinet to lock drawers.
2. Description of the Related Art
FIGS. 1 and 2
show a cabinet lock according to the prior art. As illustrated, when the key
10
inserted into the lock body
11
and rotated, the lock cylinder
12
is driven to rotate a horizontal link
13
, thereby causing the eccentric rear section
131
of the horizontal link
13
to lift/lower a vertical link
14
. The vertical link
14
comprises a plurality of hooks
141
disposed at different elevations corresponding to the respective drawers
15
. When the vertical link
14
lifted, the hooks
141
are respectively forced into engagement with the drawers
15
, and therefore the drawers
15
are locked. On the contrary, when the vertical link
14
lowered, the hooks
141
are respectively disengaged from the drawers
15
, and therefore the drawers
15
are unlocked. This design of cabinet lock is still not satisfactory in function. When locking or unlocking the drawers
15
, the user must apply a strong rotary force to the key
10
to rotate the lock cylinder
12
. Because the key
10
bears much torsional force, it tends to be deformed. If the drawers
15
are not respectively set into position when locking, the hooks
141
will not be forced into engagement with the drawers
15
, and the lock cylinder
12
will receive an excessive resisting force, thereby causing damage to the cabinet lock. Further, if the key
10
is not turned to the locking or unlocking position accurately, an interference between the hooks
141
and the drawers
15
will occur when moving the drawers
15
in or out of the cabinet.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a cabinet lock, which is durable in use. It is another object of the present invention to provide a cabinet lock, which requires less effort to operate. To achieve these and other objects of the present invention, the cabinet lock comprises an upright track vertically mounted in the back side of the cabinet, the upright track comprising a plurality of sliding slots disposed at different elevations corresponding to the drawers of the cabinet, a top lug located on a top side thereof, and a bottom locating rod located on a bottom side thereof; a sliding locking bar vertically slidable mounted in the upright track, the sliding locking bar comprising a plurality of hooks respectively inserted through the sliding slots of the upright track and adapted to hook the drawers of the cabinet respectively, a top lug located on a top side thereof, and a bottom protruding rod downwardly extended from a bottom side thereof; a spring member coupled between the bottom locating rod of the upright track and the bottom protruding rod of the sliding locking bar and adapted to impart an upward pressure to the sliding locking bar; a push bar, the push bar having a front end and a rear end; a linkage coupling the rear end of the push bar to the top lug of the upright track and the top lug of the sliding locking bar; and a press-button lock, the press-button lock having a lock cylinder fastened to the front end of the push bar for enabling the sliding locking bar to be moved vertically in the upright track between a locking position and an unlocking position when the user operating the press-button lock.
REFERENCES:
patent: 1073274 (1913-09-01), Millice
patent: 1193955 (1916-08-01), Watson et al.
patent: 1353453 (1920-09-01), Chipperfield
patent: 1370089 (1921-03-01), Chipperfield
patent: 2091382 (1937-08-01), Swimmer
patent: 2180630 (1939-11-01), Hearn
patent: 2532942 (1950-12-01), Reimer
patent: 2875011 (1959-02-01), Higberg
patent: 2966384 (1960-12-01), Bergman
patent: 3371974 (1968-03-01), Vermeersch
patent: 3575480 (1971-04-01), Peisker
patent: 5257860 (1993-11-01), Slivon
patent: 6409290 (2002-06-01), Lin
patent: 664063 (1929-08-01), None
patent: 708333 (1931-07-01), None
patent: 756583 (1956-09-01), None
patent: 967279 (1964-08-01), None
Gall Lloyd A.
Rosenberg , Klein & Lee
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