DE29603902U1 - Rear key - Google Patents

Description

Ingeborg Breuer · * * I ·· · .«·

DESCRIPTION

REAR LOCK KEY

The invention relates to a key that is inserted from one side of a door through a passage (9) into a locking channel or locking cylinder core of a lock located on the other side of the door. The passage to the other side of the door is not located on the axis of rotation (6) of the key in the lock; it is located, for example, directly below the lock.

In one embodiment, the rear part of a conveniently continuous locking cylinder core is released using the rear lock key, so that the locking cylinder core can be rotated by a second key (1) inserted into the front part.

In another embodiment, the lock (3 in Fig. 2), which is normally only accessible from the inside, can be operated from the outside using this special key.

INTRODUCTION
There is ongoing interest in new types of locking devices for doors and containers. The constant development of the possibilities for unauthorized opening also requires an ever higher security standard.

Locking cylinders are widely used. Double cylinder locks make it possible to operate the lock easily from both sides. These double cylinders with a not too complicated locking system are easy to open using duplicate keys and tools such as vibrators. Other ways of opening the lock without authorization include drilling, unscrewing and, in particular, tearing out one half of the cylinder.

SUBJECT OF THE INVENTION
is an increase in the security of the lock by making it more difficult to access the locking slides and/or by eliminating the predetermined breaking point in the middle area of the cylinder.

In patent application EP 82 101 356.2, the problem of the weak point in the middle area of the cylinder was solved by using a continuous cylinder core. However, the disadvantage remains that the locking slides are still easily accessible.

Solutions are known (DE 3443516A1) in which a force connection equivalent to a continuous cylinder core is achieved between the two cylinder cores, but here too the core slides are easily accessible.

Ingeborg Breuer

According to the invention, the object is achieved in that the lock must be operated on the inside of the door. For this purpose, a special rear lock key is passed through a through-opening (9) from the outside through the door.

The solution according to the invention ensures that the front part of a double cylinder can hardly be torn out, since when using the rear lock key the weak point for a break in the middle area of the cylinder can now be eliminated by a continuous cylinder core.

- that if the lock is drilled out to the middle in one embodiment, the locking bit cannot be rotated, and in the other embodiment no direct access to the cylinder core is visible and access can also be secured.

- that the locking slides in the inside part of a double cylinder must also be adjusted, which increases the security of the lock. Using two keys makes it more difficult to open the lock with duplicate keys.

Increased security is also achieved if the door according to Fig. 2 is only secured with the inner part of the lock, making it more difficult to access.

EXAMPLES OF IMPLEMENTATION

The rear lock key according to the invention will be explained in more detail using two examples of preferred embodiments in Figures 1 and 2. In a first embodiment, the locking bit (5) is mounted so it can rotate on its axis (16a). A spring leaf (11) fixes it in the basic position. The locking cylinder core is continuous. The key is inserted far through the opening (9), turned and by pulling it back, the locking bit reaches the rear part of the locking cylinder. There it operates the locking slide. The lock can be opened with another key (1) for the front part of the locking cylinder or in another way, such as with a rotary knob.

In a second embodiment, the shaft of the key contains a flexible part, for example a flexible shaft or a link chain (10). The locking bit of the rear lock key is inserted from the outside through the passage (9) and through a curved guide tube (12) connected to it into the internal locking cylinder (3). The key bit (4) can then be turned by turning the handle part (7), the lock can be operated,

Claims (6)

Ingeborg Breuer PROTECTION CLAIMS: 1. Rear lock key characterized in that the axis of movement or axis of rotation of the locking bar (6) in the lock and the axis of rotation of the handle part (8) do not coincide, 2, Rear lock key according to claim 1, characterized in that between the locking part (lock bit) (5) and the handle part (7) of the key there is at least one non-rigid element. 3. Rear lock according to claim 1, characterized in that the non-rigid element is flexible, for example consisting of a flexible shaft or a universal joint chain (10). 4. Rear lock key according to claim 1, 2 and 3, characterized in that it releases the rear part of the lock cylinder core and the bit (4) is rotated by a second key (1) or another operating element in the front part. 5. Rear lock key according to claims 1, 2 and 3, characterized in that the lock cylinder core (2) is rotated by it. 6. Rear lock key according to several of the claims, characterized in that the extended length (shaft) of the rear lock key between the handle part (7) and the locking part (5) is longer than the thickness of the door in the area around the lock. Here is 1 sheet of drawings.