Burglar proof lock, especially lock for cars

Details Burglar proof lock, especially lock for cars Burglar proof lock, especially lock for cars

1992-07-27

1994-03-22

Cuomo, Peter M.

Locks

Operating mechanism

Key

70360, 70370, 70391, E05B 2900

Patent

active

052953777

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention generally relates to a locking means, and the invention is more particularly directed to a lock for a door, the trunk lid, the ignition switch, the steering column etc. of a motor car, which lock is designed for making it difficult or impossible to break open the lock.


BACKGROUND OF THE INVENTION

Usually a car lock is formed with a rotatable latch bolt or lock cylinder, generally referred to as a "coded" lock cylinder, which bolt or cylinder cooperates with a latch sleeve or lock sleeve which is stably mounted in the door or any other part of the vehicle. The latch bolt or lock cylinder is formed with several lock plates which become partly pressed out of the lock cylinder when the key is extracted from the cylinder, whereby said lock plates engage one or more axial slots of the latch sleeve thereby making it impossible to rotate the lock cylinder in relation to the latch sleeve. Only a key exclusively designed for the actual lock can be introduced in the lock cylinder. When such a key is introduced in the lock cylinder the lock plates become retracted into the lock cylinder, and said cylinder again can be rotated in relation to the latch sleeve. Said lock cylinder generally actuates a lock arm which releases some blocking means for the door etc, so that the door can be opened, the ingition can be switched on, the steering wheel can be rotated etc.
It is known that many locks of the above mentioned type can be opened in that a heavy screw driver or any other flat tool is introduced into the key hole and is rotated so strongly that the lock plates of the lock cylinder become broken off, whereby the lock cylinder can be rotated in relation to the lock sleeve or latch sleeve, and the door can be opened, the steering wheel can be rotated, the iginition can be switched on etc., an operation which is, of course, not intended and acceptable.


SUMMARY OF THE INVENTION

The invention intends to solve the problem of providing an improved lock of the type which is formed with a rotatable lock cylinder comprising lock plates which become partly expelled of the lock cylinder as soon as the key is being pulled out of the lock cylinder, and in which the lock is formed so that it can not be broken open by means of a screw driver or any other flat tool, or can be unpermittedly opened in any other way.
According to the invention said problem is solved in that the lock sleeve or latch sleeve is formed with several inner, all around the sleeve extending grooves matching the lock plates of the lock cylinder, and in that the lock cylinder is formed axially displacable in the latch sleeve, whereby the lock cylinder, in its normal opening and locking positions, must be located axially displaced in relation to the latch sleeve for making a locking or an unlocking possible. In said axially displaced position the lock cylinder temporarily engages a coupling means connected to the releasing or unlocking means and the locking means for the door bolt, the steering wheel lock pin etc., so that said unlocking or locking means can be actuated for unlocking and locking of the door etc. Preferably the lock cylinder is spring biassed in the key direction, that is out from the lock actuation means of the door, so that the lock cylinder, in its non-actuated condition, always is located in the position enabling an introduction of the lock plates of the lock cylinder in the circular grooves of the latch sleeve.
In a special embodiment of the invention also the latch sleeve is formed rotatable in relation to a lock housing which is stationary mounted in the door, in relation to the steering wheel column etc., so that the lock cylinder, in its locked condition, rotates in the latch sleeve when the key is rotated, and the latch sleeve, concurrently therewith, may rotate in relation to the lock housing.
Further characteristics and advantages of the invention will be evident from the following detailed description of a couple of preferred embodiments of the invention, given as examples only.


BRIEF D

REFERENCES:
patent: 2023208 (1935-12-01), Olson
patent: 3410123 (1968-11-01), Jacobi
patent: 3438506 (1969-04-01), Groth
patent: 3566637 (1971-03-01), Hallmann
patent: 3570287 (1971-03-01), Hallmann
patent: 4099395 (1978-07-01), Garza
patent: 4418554 (1983-12-01), Wolfgang
patent: 4448050 (1984-05-01), Nugent et al.
patent: 4759204 (1988-07-01), Neyret
patent: 4773240 (1988-09-01), Foshee
patent: 4903512 (1990-02-01), Leroy et al.
patent: 4936895 (1990-06-01), Leclerc et al.
patent: 5070716 (1991-12-01), Whorlow

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