DE9103472U1 - Motor vehicle door lock, hood lock or similar. - Google Patents

Description

Gesthuysen &. von Rohr

The invention relates to a motor vehicle door lock, hood lock or the like. according to the preamble of claim 1.

One problem with motor vehicle door locks, hood locks, etc. is that a thief can try to push up the pawl that holds the rotary latch in the safety position - the door is closed. This can sometimes be achieved through the rubber seal of a motor vehicle door or by breaking through the metal of the motor vehicle door at a very specific point. For this reason, attempts have been made for some time to specify special anti-theft devices for the pawl or rotary latch. It is known from the state of the art (DE-U 7 534 154) to block the pawl in the safety position and the anti-theft position, so that it cannot be pushed up from the outside or pushed out of the main catch in the rotary latch. It is also known from practice to assign a second pawl - anti-theft pawl - to the rotary latch in addition to the normal pawl. If the rotary latch is in the closed position with the locking pawl in the main position, the other notch of the rotary latch, which is assigned to the anti-theft pawl, is positioned in such a way that the anti-theft pawl can also engage here. The anti-theft pawl can be engaged by actively operating the anti-theft pawl from a separate locking cylinder or in a further switching step from the normal locking cylinder. The anti-theft pawl can be positioned in such a way that it can no longer be reached from the outside.

For the multi-point locking of modern central locking systems in motor vehicles, it is essential that it can be centrally locked even when the vehicle door or, in particular, the trunk lid is open, without any blockages occurring. This is also regularly achieved. However, a multi-point locking system causes a problem with the additional anti-theft device explained above.

Gesthuysen & von Rohr

The invention is based on the object of specifying a motor vehicle door lock, hood lock or the like of the type in question, which, in particular as a hood lock, is suitable for multi-point locking with central locking systems, also with regard to the anti-theft latch.

The above-described object is achieved in a motor vehicle door lock, hood lock or the like with the features of the preamble of claim 1 by the features of the characterizing part of claim 1. Preferred embodiments are described in claims 2 and 3.

It is essential for the teaching of the invention that the anti-theft latch is connected to an over-center spring. This acts on the anti-theft latch in such a way that when the rotary latch is in the open position but the locking cylinder is operated to reach the anti-theft position, only the over-center spring is pre-tensioned, but the anti-theft latch does not yet fall into place. When the vehicle door or hood is closed, the anti-theft latch can then fall into the anti-theft notch that has been reached under the action of the over-center spring. As a result, such an anti-theft device can also be used with multi-point locking as part of a central locking system.

In the following, the invention is explained again using a drawing that merely represents an exemplary embodiment. The drawing shows

Fig. 1 in a view, schematically, a motor vehicle door lock, hood lock or the like according to the invention, here in the form of a trunk lid lock, and

Fig. 2 shows a highly simplified schematic representation of the mechanical construction of the lid lock explained above.

Qesihuysen & von Rohr;

The lid lock shown in Figure 1 has a lock carrier 1, which is usually designed as a metal plate. The entire locking mechanism is attached to the lock carrier 1, usually mounted on pivot axes. Mounted on the lock carrier 1 on a pivot axis 2 is a rotary latch 3, which is designed as a fork latch and comprises a locking block 4, here in the form of a sound-damped locking wedge, arranged on an associated part of the motor vehicle, for example a frame. Figure 1 shows the closed position of the rotary latch 3, in which it is secured by a pawl 6 that has fallen into a main catch 5 on the rotary latch 3. A pre-catch 7 is also provided on the rotary latch 3, as is known per se. The pawl 6 can be released by a release lever 8, which in turn is actuated by a common coupling element 9, which in turn is connected to a locking cylinder 10 of the lid lock.

For the purpose of additional anti-theft protection, a second pawl - anti-theft pawl 11 - is assigned to the rotary latch 3 at a location that is inaccessible from the outside, which, when the pawl 6 has fallen into the main catch 5 and the anti-theft device is switched on, falls into another catch - anti-theft catch 12 - on the rotary latch 3. In the illustrated embodiment, the anti-theft device is switched on and the anti-theft pawl 11 has fallen into the anti-theft catch 12 on the rotary latch 3, which is only indicated in Fig. 1, but can be seen more clearly in Fig. 2.

In the illustrated and in this respect preferred embodiment, the locking pawl 6 and the anti-theft pawl 11 can both be actuated by one and the same locking cylinder 10. As shown in Fig. 2, this can assume three different positions, namely an unlocking position E, a locking position S and an anti-theft position DS.

Gesthuysen ,& vqn Rohr;

It is essential for the teaching of the invention that an over-center spring 13 engages the anti-theft latch 11, by means of which the anti-theft latch 11 is pre-tensioned either in the direction of its unlocked position or in the direction of its anti-theft position, that there is a connection between the locking cylinder 10 and the anti-theft latch 11, in particular an elongated hole connection 14, which allows a certain amount of play in the anti-theft position, that a track 15 for the anti-theft latch 11 is provided on the rotary latch 3 in front of the anti-theft catch 12 and that the anti-theft latch 11 rests against the track 15 under the pre-tension of the over-center spring 13 when the rotary latch 3 is not yet in the closed position but the anti-theft latch 11 is switched to the anti-theft position and when the rotary latch 3 reaches the closed position, it moves into the Anti-theft catch 12 is engaged. Fig. shows the complete locking position and security position with anti-theft position, i.e. with anti-theft latch 11 engaged, Fig. 2 shows this in solid lines, the position of anti-theft latch 11 in non-theft-proof position is shown in dashed lines. A slotted hole connection 14, as a connection that allows a certain amount of play, has the advantage of a precisely defined dead motion compared to a bending rod, for example. It allows the locking cylinder 10 to move into the anti-theft position DS without the anti-theft latch 11 necessarily having to be moved along the last part of this path. Only the over-center spring 13 is switched over to the anti-theft position, so that it pre-tensions the anti-theft latch 11 in the direction of its anti-theft position. The anti-theft protection position 11 then snaps into the anti-theft protection catch 12 under the action of the over-center spring 13 when the rotary latch 3 finally reaches its closed position and thus the anti-theft protection position.

Gesthuysen & von Rohr _: *

In the embodiment shown, the anti-theft latch 11 is designed as a double lever that can be pivoted about a bearing axis 16, one lever arm of which engages in the anti-theft catch 12 and the other lever arm of which is engaged by the over-center spring 13 and, if applicable, the locking cylinder 10.

In contrast to normal locking pawls 6, it is important for the anti-theft pawl 11 that it is positively pulled into its non-theft-proof position by the locking cylinder 10 and remains there under the effect of the over-center spring 13 when the vehicle door lock is in normal security. The anti-theft pawl 11 is only pre-tensioned in the anti-theft direction when the anti-theft device is positively activated.

The combination of over-center spring 13 and slotted connection 14 also has the great advantage that the key in the locking cylinder 10 can be turned from the security position to the anti-theft position without having to work against the spring force of a spring the whole way. For the majority of this path, the locking cylinder 10 can rotate in idle mode, only the over-center spring 13 has to be moved past its dead center. The key therefore experiences a slight resistance at the beginning of the rotational movement into the anti-theft position, after which only the restoring force of a restoring spring 17, if present and also implemented in the illustrated embodiment, takes effect.

Claims (3)

Gesthuysen & von Rohr- Protection claims: 1. Motor vehicle door lock, hood lock or the like with a rotary latch (3), a pawl (6) which engages in the rotary latch (3) in a main notch (5) and optionally also in a preliminary notch (7), wherein the rotary latch (3) is assigned a second pawl - anti-theft pawl (11) - at a location inaccessible from the outside, which, when the pawl (6) has engaged in the main notch (5) and the anti-theft device is switched on, engages in a further notch - anti-theft notch (12) - on the rotary latch (3), and wherein the pawl (6) and the anti-theft pawl (11), preferably both, can be actuated from one and the same locking cylinder (10), characterized in that an over-center spring (13) acts on the anti-theft pawl (11), by means of which the anti-theft pawl (11) is moved either in the direction of its unlocked position or in Direction towards its anti-theft position is pre-tensioned, that between the locking cylinder (10) and the anti-theft pawl (11) there is a connection which allows a certain amount of play in the anti-theft position, in particular an elongated hole connection (14), that a track (15) for the anti-theft pawl (11) is provided on the rotary latch (3) in front of the anti-theft catch (12) and that the anti-theft pawl (11) rests on the track (15) under the pre-tension of the over-center spring (13) when the rotary latch (3) is not yet in the closed position but the anti-theft pawl (11) is switched to the anti-theft position and when the rotary latch (3) reaches the closed position it falls into the anti-theft catch (12) under the action of the over-center spring (13). 2. Motor vehicle door lock, hood lock or the like according to claim 1, characterized in that the anti-theft latch (11) is designed as a double lever pivotable about a bearing axis (16), one lever arm of which engages in the anti-theft catch (12) and the other lever arm of which is engaged by the over-center spring (13) and, if applicable, the locking cylinder (10). Gesthuysen & von Rohr _; „ ,, 3. Motor vehicle door lock, hood lock or the like according to claim 1 or 2, characterized in that the locking cylinder (10) has three locking positions - unlocked, secured and anti-theft.