Auxiliary lock with an adjustable backset

Details Auxiliary lock with an adjustable backset Auxiliary lock with an adjustable backset

2002-07-08

2004-07-20

Swann, J. J. (Department: 3677)

Closure fasteners

Adjustable backset

C292S337000

Reexamination Certificate

active

06764112

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an auxiliary lock with an adjustable backset. In particular, the present invention relates to a backset-adjustable auxiliary lock that has a simple structure and improved strength.
2. Description of the Related Art
FIG. 10
of the drawings illustrates a conventional auxiliary lock with an adjustable backset. A beveled face
82
on a pushbutton
81
abuts against an underside
84
of an adjusting plate
83
that has a shoulder
85
selectively engaged in one of two notches
87
and
88
of a push plate
86
. When adjustment of the backset is required, the pushbutton
81
is pushed to disengage the shoulder
85
of the adjusting plate
83
from, e.g., the notch
87
of the push plate
86
and then engage with the other notch
88
of the push plate
86
.
FIG. 11
illustrates another conventional auxiliary lock with an adjustable backset. The auxiliary lock comprises a housing
93
and a casing
92
mounted in the housing
93
. The casing
92
and the housing
93
are rotatable relative to each other such that a hook
911
on the housing
93
is releasably engaged in a notch
921
in the casing
92
. An L-shaped slot
922
is defined in a periphery of the casing
92
, and a key
931
is formed on an outer periphery of the housing
93
and received in the slot
922
. The key
931
is slidable along the slot
922
and thus causes a peg
941
on a plate
94
to selectively be engaged in one of two holes
952
and
953
on an extension
951
extending from an end of a deadbolt
95
, allowing adjustment of the backset.
However, these conventional auxiliary locks have complicated structures due to numerous parts and thus causes troublesome manufacture. Further, adjustment of the backset is not easy. Further, these conventional auxiliary locks are apt to be destroyed due to insufficient strength.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a backset-adjustable auxiliary lock that has a simple, reinforced structure for easy manufacture.
An auxiliary lock in accordance with the present invention comprises:
a housing including a circular hole therein, a faceplate being attached to an end of the housing and including an opening, the housing further including a guide member;
a casing including a first end and a second end, the first end of the casing being received in the housing and including a first positioning slot and a second positioning slot, the second end of the casing including aligned pivot holes, the guide member being selectively engaged in one of the first positioning slot and the second positioning slot, wherein the housing is movable along a longitudinal direction of the housing when the guide member is disengaged from the first and second positioning slots of the casing, and wherein the housing is not movable along the longitudinal direction of the housing when the guide member is engaged in one of the first positioning slot and the second positioning slot;
a deadbolt assembly including a deadbolt, a connecting member, and a pull rod, the deadbolt being received in the housing and slidable between a retracted position in the housing and an extended position in which an end of the deadbolt is beyond the housing, the connecting member being mounted to another end of the deadbolt, the pull rod including a first end mounted in the deadbolt and a second end beyond the deadbolt, the first end of the pull rod including two guide grooves each having a longitudinal section and two retaining sections transverse to the longitudinal section and communicated with the longitudinal section, wherein when the connecting member is in the retaining sections, the deadbolt is not movable along the longitudinal direction of the housing, and wherein when the connecting member is in the longitudinal section, the deadbolt is movable along the longitudinal direction of the housing relative to the pull rod, the deadbolt and the opening of the faceplate being so configured that the deadbolt turns together with the housing when the deadbolt is in its extended position and that the deadbolt is not turnable when the deadbolt is in its retracted position; and
a drive wheel including a cylindrical portion that is rotatably held in the pivot holes of the casing, a drive arm extending from the cylindrical portion and having an end connected to the second end of the pull rod such that rotation of the drive wheel causes movement of the pull rod for moving the deadbolt along the longitudinal direction of the housing.
Other objects, specific advantages, and novel features of the invention will become more apparent from the following detailed description and preferable embodiments when taken in conjunction with the accompanying drawings.


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