Unlocking device for a lever handle door lock

Details Unlocking device for a lever handle door lock Unlocking device for a lever handle door lock

2003-11-18

2004-10-26

Gall, Lloyd A. (Department: 3676)

Locks

Special application

For closures

C070S215000, C070S217000, C070S224000, C070S467000, C070S473000, C070S475000, C070S477000, C070S478000, C070S485000

Reexamination Certificate

active

06807833

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to an unlocking device for a lever handle door lock. More particularly, the present invention is related to the unlocking device to separately actuate the lever handle door lock in locking state by turning an inner lever.
2. Description of the Related Art
Referring initially to
FIG. 13
, a conventional tubular lock includes an inner knob
91
and a locking button
911
thereof for locking. The tubular lock further includes an outer knob
92
and a lock core
962
, which are used to rotate an actuating rod
93
and thus to push a shaft
94
and a limiting plate
95
. The actuating rod
93
bears at least one protrusion
931
which engages with an inclined surface
941
of the shaft
94
so as to move the protrusion
931
along the inclined surface
941
. The limiting plate
95
provides with at least one tooth
951
. Moving in an axial direction, the limiting plate
95
causes an engagement/disengagement of the tooth
951
with/from a groove
961
of a rose escutcheon
96
for locking/unlocking purpose. In the locking state, an outer knob
92
is unable to turn a spindle
97
to operate a latch bolt unit (not shown). In the unlocking operation, turning the lock core
962
by a correct key results in a release of the tooth
951
from the groove
961
to allow returning the actuating rod
93
, or turning the inner knob
91
results in a turning movement of the shaft
94
. When the protrusion
931
of the actuating rod
93
stops at a bottom of the inclined surface
941
of the shaft
94
, the limiting plate
95
releases from the rose escutcheon
96
for unlocking purpose. In use, the shaft
94
connects to an auxiliary lock (not shown) to operate for locking or unlocking it. In the unlocking state, turning the outer knob
92
is able to rotate the spindle
97
and the shaft
94
that result in an unlocking drive of the auxiliary lock. Hence, there is a need for an outer lever for a tubular lock assembly or a lever handle door lock which can avoid an outer lever driving an auxiliary lock.
The present invention intends to provide an unlocking device for a lever handle door lock, which can avoid an outer lever, in the unlocking state, driving an inner actuating rod to rotate in such a way to mitigate and overcome the above problem.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide an unlocking device for a lever handle door lock, which can avoid an outer lever, in the unlocking state, driving an inner actuating rod to rotate that can prevent the outer lever inadvertently unlocking an auxiliary lock.
The secondary objective of this invention is to provide the unlocking device for the lever handle door lock, which consists of an inner actuating rod and an outer actuating rod separately driven by an inner lever and an outer lever.
The unlocking device for the lever handle door lock in accordance with the present invention includes an inner lever, an outer lever, an inner mounting plate, an outer mounting plate, a spindle, an inner actuating rod and an outer actuating rod. The inner mounting plate and the outer mounting plate mount the inner lever and the outer lever on a door. Each of the inner lever and the outer lever has an assembling hole so that the inner lever and the outer lever are correspondingly connected to the inner actuating rod and the outer actuating rod for separately operating a latch bolt unit. The inner actuating rod is axially aligned with the outer actuating rod and has an end capable of disengaging from that of the outer actuating rod so as to avoid the outer lever driving the inner actuating rod.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings.


REFERENCES:
patent: 2959952 (1960-11-01), Schweitzer
patent: 2998274 (1961-08-01), Russell
patent: 5372025 (1994-12-01), Lin
patent: 5657653 (1997-08-01), Hensley et al.
patent: 5784909 (1998-07-01), Huang
patent: 6223567 (2001-05-01), Fadul
patent: 6360569 (2002-03-01), Huang
patent: 6742367 (2004-06-01), Wu
patent: 2003/0106355 (2003-06-01), Huang
patent: 509571 (1955-01-01), None
patent: 295110 (1932-04-01), None

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