Locks – Special application – For automotive vehicles
Reexamination Certificate
2002-07-25
2003-12-23
Barrett, Suzanne Dino (Department: 3676)
Locks
Special application
For automotive vehicles
C070S277000, C070S279100, C070S278700, C292S144000
Reexamination Certificate
active
06666054
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a remote-controlled door lock, particularly to one provided with a braking device capable of being controlled by a remote controller to restrict a latch-bolt assembly in a locked position. When a circuit board receives a locking sign from the remote controller, the circuit board will actuate a motor of the braking device to turn a driving gear to rotate a gear rack of a slide block that is meshed with the driving gear to move a retaining member that is disposed at a bottom of the slide block upwards to be engaged with a through hole of the latch-bolt assembly without moving into a slide slot that extends from the through hole and has a width smaller than a diameter of the retaining member so as to restrict the latch-bolt assembly in a locked position, whereby even though dead bolts of a lock base are unlocked, the door lock cannot be completely unlocked without using the remote controller to actuate the braking device to relieve the latch-bolt assembly from being locked, thus achieving a best effect of anti-theft.
2. Description of the Prior Art
A conventional key-operated door lock, as shown in
FIG. 1
, includes a case body
10
provided with a lock base
11
, a pull plate
12
and a latch-bolt assembly
13
disposed therein. The lock base
11
has dead bolts
110
provided at one side thereof and capable of extending out of through holes
100
formed in a sidewall of the case body
10
. The lock base
11
further has two lock cores
111
respectively disposed in an inner and an outer sides thereof and each provided with a keyhole
112
. The pull plate
12
is disposed in the outer side of the case body
10
and has a fixing plate
120
extending into a slide groove
101
of the case body
10
and attached relatively to a fixing plate
102
of the case body
10
. One end of the latch-bolt assembly
13
extends through the fixing plate
102
of the case body
10
to be secured to the fixing plate
120
of the pull plate
12
. A spring
130
is sleeved on the latch-bolt assembly
13
adjacent to the end thereof. The other end of the latch-bolt assembly
13
is provided with a stop member
131
capable of extending out of a through hole
103
formed at the sidewall of the case body
10
. When a key is inserted in the keyhole
112
of one of the lock cores
111
to turn, the dead bolts
110
and the stop member
131
will move back into the case body
10
, thus unlocking the conventional key-operated door lock.
However, such a conventional key-operated door lock only using a key to lock the dead bolts
110
can be easily pried unlocked by thefts with simple picking tools or special tools, thus losing the anti-theft function.
SUMMARY OF THE INVENTION
The main purpose of the invention is to offer a remote-controlled door lock having a best effect of anti-theft.
The main feature of the invention is to provide a case body having a battery base, a circuit board and a braking device disposed therein, the braking device located above a latch-bolt assembly and having a fixed base, two slide rails disposed in the fixed base, a motor disposed at an outer sidewall of the fixed base and having a shaft with one end extending into the fixed base, a driving gear disposed on the end of the shaft of the motor, a slide block disposed in the fixed base and having one end placed between the two slide rails and the other end provided with an inner surface formed as a gear rack capable of being meshed with the driving gear, a connecting rod fixed at a bottom of the slide block and having a retaining member disposed at a lower end thereof; and,
a latch-bolt assembly having a through hole formed thereon, and a slide slot extending from the through hole and having a width smaller than a diameter of the retaining member.
REFERENCES:
patent: 2765648 (1956-10-01), Hatcher
patent: 4784415 (1988-11-01), Malaval
patent: 5216909 (1993-06-01), Armoogam
patent: 5531086 (1996-07-01), Bryant
patent: 5588318 (1996-12-01), Osborne
patent: 5636536 (1997-06-01), Kinnucan
patent: 5790034 (1998-08-01), Khoury
patent: 5943888 (1999-08-01), Lawson
patent: 6462431 (2002-10-01), Woo
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