Door lock

Details Door lock Door lock

2000-01-25

2002-03-19

Luu, Teri Pham (Department: 3627)

Closure fasteners

Bolts

Swinging

C292S336300

Reexamination Certificate

active

06357807

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a door lock, more particularly to a door lock adapted to be mounted on a door of a building.
2. Description of the Related Art
FIGS. 1
to
4
illustrate a conventional door lock
1
adapted to be mounted on a door
2
of a building. The door lock
1
includes an escutcheon
11
mounted on one side of the door
2
, a handle
12
mounted rotatably on the escutcheon
11
, a handle orienting unit
13
mounted on the escutcheon
11
between the escutcheon
11
and the door
2
, a transmission shaft
10
connected to the handle
12
, a lever seat
14
mounted on the other side of the door
2
, a lever
16
mounted rotatably on the lever seat
14
, a cam
15
mounted rotatably on the lever seat
14
for camming the lever
16
, and a latch
17
mounted rotatably on the lever seat
14
and being operable by the lever
16
.
The escutcheon
11
has a bottom plate
111
confronting the door
2
, and two opposite side plates
116
projecting from the bottom plate
111
toward the door
2
. An opening
112
is formed in the bottom plate
111
. A first annular flange
113
projects from the bottom plate
111
around the opening
112
toward the door
2
. Two opposite lugs
114
extend laterally and respectively from the opposite side plates
116
. A pair of opposite nuts
115
project from the bottom plate
111
, and are inserted into apertures
25
in the door
2
.
The handle
12
has a gripping section
121
, and a tubular section
122
extending from one end of the gripping section
121
toward the escutcheon
11
. The tubular section
122
has a thickness reduced end
123
that extends through the opening
112
in the base plate
111
and the first annular flange
113
. A C-shaped locking spring
124
is sleeved on an annular groove formed in the thickness reduced end
123
of the tubular section
122
for preventing the handle
12
from moving in an axial direction.
The transmission shaft
10
has a square-shaped cross-section, and opposite front and rear ends
101
,
102
. The front end
101
of the transmission shaft
10
extends through the first annular flange
113
into the tubular section
122
of the handle
12
. The rear end
102
of the transmission shaft
10
is adapted to extend through a through-hole
24
in the door
2
to the lever seat
14
.
The handle orienting unit
13
has a torsion spring
131
sleeved around the first annular flange
113
and the thickness reduced end
123
of the tubular section
122
, and a cap
132
having a base wall
135
confronting the first annular flange
113
, and a peripheral side wall
136
that projects from the base wall
135
toward the bottom plate
111
and that surrounds the torsion spring
131
and the first annular flange
113
. The peripheral side wall
136
has two diametrically opposed notches
138
which have notched edges
139
formed thereon. The torsion spring
131
has two opposite radially extending end sections
134
extending outwardly of the peripheral side wall
136
through the notched edges
139
to the lugs
114
, respectively. One of the end sections
134
of the torsion spring
131
abuts against one of the notched edges
139
, and the other one of the end sections
134
of the torsion spring
131
abuts against one of the lugs
114
. The base wall
135
has an inner edge,
137
defining a central opening that is square in shape and that aligned with the opening
112
in the bottom plate
111
. A hollow sleeve
133
, which has a square-shaped cross-section, is inserted into the central opening in the base wall
135
, and extends therefrom to the door
2
. The sleeve
133
engages the inner edge
137
of the base wall
135
, and is sleeved around and engages the transmission shaft
10
so that the torsion spring
131
and the cap
132
are rotatable about the transmission shaft
10
via the sleeve
133
when the transmission shaft
10
rotates. The arrangement of the handle orienting unit
13
permits the handle
12
and the latch
17
, which will be described in more detail below, to be returned from an unlatching position to a latching position.
The lever seat
14
has a base plate
141
and two side plates
143
projecting outwardly from two opposite sides of the base plate
141
toward the door
2
. Two opposite nuts
144
project outwardly from the base plate
141
toward the door
2
for receiving two bolts
18
that extend through the door
2
into the nuts
115
of the bottom plate
111
of the escutcheon
11
, thereby fastening the lever seat
14
and the escutcheon
11
on the door
2
. An opening
148
is formed in the base plate
141
between the opposite side plates
143
. A second annular flange
145
projects from the base plate
141
toward the door
2
around the opening
148
in the base plate
141
. Two opposite rear plates
142
project outwardly from the base plate
141
at one side of the base plate
141
opposite to the side plates
143
.
The cam
15
has a hollow tubular stud
153
extending through the opening
148
in the base plate
141
into the second annular flange
145
, and a camming portion
152
extending from one end of the stud
153
to the opposite rear plates
142
for camming the lever
16
. The rear end
102
of the transmission shaft
10
extends into the tubular stud
153
of the cam
15
. The stud
153
has an end
151
that extends through the flange
145
adjacent to the door
2
and that is formed with an annular groove for receiving a C-shaped locking spring
154
which prevents the cam
15
from moving in an axial direction.
The lever
16
is disposed between the rear plates
142
, and has a pressing portion
163
and a pivoting portion
164
projecting outwardly from the pressing portion
163
and mounted pivotally on the rear plates
142
via a first pivot pin
161
extending through the pivoting portion
164
and the rear plates
142
. The pivoting portion of the lever
16
has an end portion
162
that engages the camming portion
152
at one side and that engages the latch
17
at the other side so that the latch
17
is operable by the handle
12
via the transmission shaft
10
, the cam
15
, and the lever
16
.
The latch
17
is disposed between the rear plates
142
, and has a free end
173
and a pivoting end
172
opposite to the free end
173
. The pivoting end
172
is mounted pivotally on the rear plates
142
via a second pivoting pin
171
extending through the pivoting end
172
of the latch
17
and the rear plates
142
. The pivoting end
172
of the latch
17
engages the end portion
162
of the pivoting portion
164
of the lever
16
so that the free end
173
of the latch
17
is adapted to engage and disengage a door frame
23
by the lever
16
. A coil spring
174
is disposed between and abuts against the lever
16
and the latch
17
for providing a force to move the free end
173
of the latch
17
to engage the door frame
23
.
The aforementioned door lock
1
has disadvantages in that the handle orienting unit
13
is arranged at the escutcheon
11
, while the cam
15
, the lever
16
, and the latch
17
are arranged at the lever seat
14
(see FIG.
4
). As a result, the assembly of these parts is laborious. Moreover, after installation of the handle orienting unit
13
on the escutcheon
11
, the sleeve
133
must be bulged so as to prevent the handle orienting unit
13
from moving in an axial direction.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a door lock that is capable of overcoming the aforementioned problem.
Accordingly, a door lock of this invention comprises: a handle having a transmission shaft and adapted to be mounted rotatably on one side of a door; a lever seat having a lever mounted rotatably thereon, disposed opposite to the handle, and adapted to be mounted securely on the other side of the door, the lever seat having a vertically disposed base plate, two opposite side plates extending laterally and respectively from two opposite sides of the base plate toward the handle, an opening formed in

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