EP2929113B1 - Lock for a hatch or door - Google Patents

Description

The invention relates to a lock for a flap or a door with the features of the preamble of claim 1. A lock of the aforementioned type is known from the document DE 10 2008 061 524 A1 known. The door or flap may be a door or flap of a motor vehicle or a building.

The aforementioned lock comprises a locking mechanism with a rotary latch and at least one pawl, with which the catch can be locked in a closed position by locking surfaces of pawl and rotary latch. Detent surfaces means the surfaces of the rotary latch and pawl which abut each other for locking the locking mechanism and then have an overlap result. In a closed position, the rotary latch is able to hold a locking bolt of a door or a flap, so that the door or flap can not be opened. If the catch is in an open position, the locking bolt can leave the locking mechanism and the door or flap can be opened.

A rotary latch has a load arm and a tentacle. In the case of a locked locking mechanism, the load arm prevents a locking bolt from leaving a door or a flap. If a door or a flap is closed, the locking pin is moved against the catching arm and pivots it and thus also the catch in the direction of the closed position.

The publication DE 10 2010 003 483 A1 discloses a ratchet in which the catch introduces an opening moment into the pawl when the pawl locks the catch in the main catch position. For example, the rotary latch may introduce such torque into the pawl due to a door seal pressure and / or due to a biased spring capable of rotating the catch to its open position and / or by opening an associated door or flap. By an opening Moment the pawl can be moved out of its rest position. In order to reliably prevent this in the case of a locked locking mechanism, there is then additionally a blocking lever which is capable of blocking the removal of the locking pawl from its locking position. To open such a locking mechanism, the blocking lever is pivoted out of its blocking position by means of a release lever. In general, then the opening moment is sufficient, which is introduced by the catch in the pawl to detent the locking, so to open it.

For whatever reason, in the case of a locking mechanism with an aforementioned opening moment, the case may arise that the opening moment is not sufficient to swing the locking pawl out of its locking position. Nevertheless, to ensure that the locking mechanism opens even in the event of such a fault, there is a driver, for example, on the release lever and / or as in the DE 10 2010 003 483 A1 described attached to the pre-locking pawl known therefrom. Such a driver is intended to move the pawl out of its detent position, in particular, when the pawl is unable to leave the detent position on the basis of the opening moment alone.

Thus, the locking mechanism can be opened due to the driver, the provided for example on the trigger lever driver must be able to be pivoted over a sufficiently large angle. Regularly an angle of 20 ° to 30 °, usually of about 25 ° is required to move a pawl completely due to the driver completely out of its detent position.

A release lever of a locking mechanism is basically pivoted by operating a handle to detent a locking mechanism. The handle may be an inside door handle or an outside door handle of a motor vehicle. Such a handle is usually connected via a linkage or a Bowden cable with the release lever, so as to pivot the trigger lever by pressing the handle. Due to age, the rod or the Bowden cable, so this can reduce the pivoting range by which the release lever can be pivoted by pressing a handle. It then threatens that the locking mechanism can no longer reliably open.

The publication FR2243314A1 discloses a motor vehicle door closing unit having a door housing provided on the lock housing, the lock operating lever allows both for the operation of the door closing unit from the vehicle interior side and from the vehicle outside.

The publication DE102010003483A1 discloses a lock for a motor vehicle having a ratchet comprising a catch, a pre-ratchet pawl, a main-ratchet pawl, a pawl latch for blocking the main ratchet pawl, a catch ratchet pawl driving the main-ratchet catch out of its latched position to turn.

The document D 102007003948A1 discloses a lock unit for a motor vehicle comprising at least a rotary latch, a first pawl and a blocking lever, wherein in a locked state of the lock unit, the rotary latch initiates a pivoting moment in the first pawl and the first pawl is fixed by means of the blocking lever, wherein a second pawl provided is mounted on the pawl rotation axis and engageable with the blocking lever and the rotary latch.

In the locks of the aforementioned three documents basically comparatively small angle of rotation of the pawl may be sufficient for triggering the locking mechanism.

The publication DE102005035898A1 discloses a rotary latch closure in which the rotary latch comprises a slot. Especially in the case of a vehicle is limited space available. Also, a professional, especially in the case of motor vehicles constantly strives to reduce weights. In a castle, it is therefore important, especially in the case of motor vehicles, to be able to build this small and light.

It is an object of the invention to provide a reliable functioning, small and lightweight lock of the type mentioned.

The object of the invention is achieved by a lock with the features of the first claim. Advantageous embodiments emerge from the subclaims.

To solve the problem, a lock for a door or flap is provided with a locking mechanism of the catch and at least one pawl for locking the catch. The latching surface of the latching arm of the pawl, through which the catch can be locked, is designed to reduce the space and weight so narrow or seen in the pivoting direction short that a pivoting movement of the pawl of up to 16.1 °, preferably up to 14 , 6 °, more preferably of up to 12.9 ° sufficient to detent the locking. Although the expert was of the opinion that a latching surface of the latching arm of a pawl must be made substantially wider, and in particular in the region of the latching surface on which the catch rests in the latched state to a very much greater swing angle of the pawl significantly greater than 14 °, for example, to provide at least 20 °, so as to prevent the locking mechanism is able to open, for example, in a crash due to excessive load. However, the present invention is based on the finding that such a width of a latching surface of a latching arm by no means absolutely necessary to ensure that a locking mechanism can not open even with excessive load. It has therefore been recognized that the width of a latching surface of a latching arm can very well be noticeably narrower in comparison to conventional latching surface widths of a latch in order to be able to save weight and volume.

In a conventional locking mechanism, the catch is located with one end of its catching arm in the latched state approximately centrally on a locking surface of the locking arm of the locking pawl serving the latching. According to the invention, the position of the latching surface is changed in comparison in such a way that in the latched state, the distance between the support point of the rotary latch to one end of the latching surface is significantly smaller than the distance to the other end of the latching surface. One end of the locking surface of the pawl is the end which is moved in the direction of support point of the catch in the latched state to unlatch the locking mechanism. In the course of a relative movement, therefore, the corresponding end of the catching arm of the rotary latch is finally moved over this one end, so that the rotary latch can subsequently be pivoted in the direction of its open position. As a locking surface, the entire surface is referred to, which is adapted to prevent the catch from pivoting noticeably in the direction of the open position.

By this embodiment it is achieved that it is ensured on the one hand that the catch is locked even in the desired manner, when the locking arm of the pawl for whatever reason whatsoever excessive, that is unscheduled far in the direction of its closed position relative to the catch arm of the catch has been moved, so for example due to an overlap increase described below when an excessive load occurs. On the other hand, a relatively small pivoting movement of the pawl in the direction of its open position is sufficient to unlatch the locking mechanism.

Viewed from the center of the support point, in a preferred embodiment, the length of the smaller distance is up to 40% of the width of the detent pawl, more preferably up to 30%, to achieve the aforementioned effects.

Experiments have shown that in a conventional locking neither the catch nor the pawl be distorted or deformed by excessive load recognizable. Rather, the receiving points of the axes of the catch and the pawl and the lock plate or the lock case on which the locking mechanism is attached, deformed. In one embodiment of the invention, therefore, such receiving points are sufficiently stable compared to conventional Gesperren and executed in particular with larger axle diameters. It can be ensured that the locking mechanism can not open even with excessive load of, for example, 20 to 30 kN. Although at least the weight is slightly increased by such a reinforcement measure such as an increase in the diameter of axes. However, by reducing the width of the pawl detent arm thereby made possible, the weight as a whole is generally lowered. If the diameter of an axis is increased, this is fundamentally not accompanied by an increase in the installation space, since this enlargement merely leads to larger recesses or bores in the lock plate and components such as a rotary latch and pawl. A reduction in the width of the locking arm of the pawl, however, very well allows a reduction of the space. Overall, it is therefore advantageous to reinforce receiving points, so as to allow a reduced width of a latching arm of the pawl.

The locking mechanism is in a preferred embodiment such that under excessive load, the rotary latch is deformed such that the rotary latch remains in its locking position and in particular due to a predetermined bending point of the rotary latch. The predetermined bending point is preferably provided on the tentacle. Despite excessive load, the overlap between the rotary latch and pawl is maintained. Preferably, this even increases. The predetermined bending point can also be provided in the load arm in such a way that under excessive load a distance of the ends of the load arm and catch arm is increased. However, the predetermined bending point is usually to be arranged on the tentacle, since the tentacle in the closed state of a door or flap is not directly loaded by the locking pin of a door or flap. An arrangement of a predetermined bending point on the load arm is therefore particularly unproblematic.

By this configuration it is avoided that by excessive load of, for example, 10 kN to 30 kN, the locking surface of the rotary latch can be released from the locking surface of the pawl due to deformation and the locking mechanism can open so unplanned. In particular, in one embodiment, the tentacle arm is bent over by excessive load relative to the load arm, thereby causing the coverage or enlargement of the overlap between the rotary latch and the pawl. By kinking basically increases the distance between the two free ends of tentacle and load arm. In this embodiment, it is not necessary to reinforce recording points in comparison to the recording points of conventional locking so that a locking mechanism is unable to open even in a crash.

In addition, a tolerance compensation succeeds by means of this embodiment. A planned overlap of the locking surfaces of pawl and rotary latch could have been reduced due to excessive tolerances in the bearing points of the catch and pawl and / or due to deformations of plastic components to be stored. Nevertheless, then it does not threaten that the locking mechanism becomes unscheduled in the event of excessive load opens, because then the overlap between the rotary latch and pawl would usually increase.

According to the invention, the predetermined bending point is designed in the form of a recess and / or comprises at least one recess, since a predetermined bending point can thus be provided with a low production outlay. Preferably, the recess is arranged on the side of the catching arm which lies on the side facing away from the locking bolt of a door or flap in a latched state of the locking mechanism.

A recess can be realized through an opening in the rotary latch. In other words, the recess forms a franking in the rotary latch. A recess can extend from a lateral contour of the rotary latch, that is, for example, from a lateral contour of a catching arm in the direction of the interior of the rotary latch, in particular in the direction of the axis of rotation of the rotary latch, so as to provide a predetermined bending point. It can be inventively formed at least one recess in the catch or load arm. But it can also be formed in the tentacle or load arm two and more recesses. A recess may be realized through one or more holes through the rotary latch.

According to the invention, two spaced-apart recesses are formed or introduced in one arm of the rotary latch, in particular in the catching arm, which lies opposite the lock holder in the closed state of the locking mechanism. A second, to a first spaced recess may advantageously reduce the weight of the rotary latch and / or positively influence the buckling behavior. In addition, there is the possibility, for example, to introduce the recess in the rotary latch such that material formed between the two recesses z. B. simultaneously serves as a stop for a pre-rest of the locking mechanism.

In a further preferred embodiment, an elevation or an arm is provided in the region of the rotary latch, which is located between the recesses, which can be used for locking the locking mechanism in the position Vorrast. One of the pawl facing first recess in the catch can serve to define the position of a predetermined bending point preferably on the tentacle. Thus, for example, depending on a depth of the first recess in the rotary latch, that is, a radial extent of the recess in the direction of a pivot point of the rotary latch, the position of the predetermined bending point can be varied. With the location of the predetermined bending point can be taken at the same time influence on the overlap between the rotary latch and pawl. If, for example, a recess extending deep into the rotary latch from the outer edge is introduced into the rotary latch, the depth of the recess determines the position of the predetermined bending point.

If the locking is overloaded, as can happen, for example, in an accident, so the locking mechanism must not detent. The catch and pawl must remain engaged. The inventive introduction of a predetermined kink in the rotary latch can support the remain positive. If a part of the rotary latch buckles over the predetermined bending point, the point of engagement between the rotary latch and the pawl shifts in the direction of a larger overlap, that is, unlatching is not only prevented, but the locking mechanism is additionally secured. As a result, it becomes immediately clear that a relative movement in the region of the point of engagement between the rotary latch and the pawl in the event of an excessive load can be controlled by the position of the predetermined bending point. In other words, it is possible by means of the invention to influence the overlap between the rotary latch and the pawl in the event of a large or oversized load.

From a deep, outgoing from a lateral contour recess in the rotary latch results in a long lever arm and thus in particular a preferable enlargement of a coverage in the load case. When Lever is the distance between the position of the kink (predetermined bending point) and the point of engagement between the catch and pawl called.

Even in the case of a small, that is small recess from the outside into an inner region of the rotary latch, an overlapping enlargement can likewise occur. However, the shorter lever arm basically leads to a smaller displacement of the point of engagement between the rotary latch and the pawl towards a larger overlap.

The predetermined bending point can alternatively or additionally be achieved by changing the material properties (elasticity), the thickness, reduced bending stiffness, a reduction in cross-section and / or a reduction in strength. For example, the material may have been weakened at a designated location by subsequent processing so as to provide a predetermined kink. The material thickness can be reduced at one point, so as to obtain a predetermined bending point at the desired location. It is possible, for example, that the material properties are changed selectively or in regions, so as to provide a predetermined bending point. This can be done for example in the form of a heat treatment, wherein areas of high and low hardness are generated in the rotary latch. In the case of an excessive load, which can act on the lock and thus the ratchet in an accident, for example, the area of lower hardness would act as a predetermined bending point, without the locking would detent. However, by comparison, a predetermined bending point provided by at least one recess is to be preferred, since in principle no additional production outlay has to be operated for this purpose.

By a favorable position of the choice of the predetermined bending point, the overlap preferably changes towards an enlargement, whereby a particularly secure locking of the locking mechanism is ensured.

Alternatively or in combination with an influence on the material properties, the rotary latch and preferably the catching arm may have a cross-sectional reduction. A cross-sectional reduction can be provided on one side or on both sides of the rotary latch. A two-sided reduction offers the advantage of a symmetrical construction of the rotary latch and can additionally positively influence a possible deformation of the rotary latch. It is also possible here for two or more cross-sectional reductions to be formed on the rotary latch in order to define a predetermined bending point and / or to selectively influence a buckling behavior of the predetermined bending point. In this case, one or more depressions can also be introduced into the rotary latch in different extension over the rotary latch. Thus, a plurality of depressions can be introduced, which form continuously increasing extensions or increasing and decreasing extensions in the rotary latch. However, in this embodiment, as a rule, a higher manufacturing outlay is also to be operated, specifically in comparison to the case of a recess which extends from a lateral contour towards the inner region of the rotary latch, specifically in the direction of the axis of rotation of the rotary latch.

In one embodiment of the invention, the recesses can be molded, pressed and / or introduced by means of a material removal in the rotary latch. As wells, reductions of a thickness of the rotary latch are at least partially considered. A depression or depressions can thus also be present, for example, as recesses which, for example, are milled or pressed into the rotary latch.

In a further embodiment, the depressions may have a cross-sectional shape that can be described as a continuous radius and / or as a U-shaped and / or a sharp notch. In this case, by means of the cross-sectional shape in an advantageous manner influence on the notch number and thus the position of the predetermined bending point can be taken.

Preferably, a predetermined bending point is provided in a rotary latch, which is able to initiate an opening moment in the pawl. The problem described at the outset occurs, in particular, with such locking mechanisms. The lock may include one or two pawls. The lock can include a position Vorrast next to a position main rest, in which the locking mechanism can be locked. The rotary latch can thus comprise one or two latching surfaces for latching. The lock may have a blocking lever with which a pawl is locked in its locked position. By the catch, an opening, a closing or no torque can be introduced into the pawl in the latched position.

The locking mechanism is preferably such that a release lever of the locking mechanism only has to be pivoted by 8 ° -18.5 °, preferably only by 10.5 ° -15.5 °, in order reliably to open the locking mechanism - if it is latched and in particular due to a driver for the pawl, which is able to move the pawl out of its detent position by pivoting the release lever out. Should the release lever, for example for reasons of age, no longer be pivotable beyond an originally possible distance of, for example, more than 20 ° by actuating a handle, this embodiment ensures that the locking mechanism can nevertheless be reliably opened.

The driver moves the pawl, in particular, only out of its detent position when the pawl is not moved out of its detent position due to an initiated opening moment. By the driver is thus ensured that the pawl is moved out of its detent position by the driver when the opening mechanism fails due to the initiated opening torque.

So that the release lever not only moves a blocking lever away from the pawl in a corresponding embodiment, but also moves the pawl out of the engagement region of the catch, the release lever must be regularly pivoted by more than 10 °. Only after pivoting of the release lever by more than 10 ° usually acts on the trip lever fixed driver with the pawl together, so that the pawl is mechanically rotated by the release lever. For this reason, it is preferable that the release lever can be pivoted by more than 10 °, so as to ensure that the driver is able to grasp and move the pawl when needed.

By the driver is then ensured that the pawl is moved out of its detent position by the driver when an opening mechanism fails due to the initiated opening torque.

The ratchet comprises in one embodiment, a pre-locking pawl, which preferably also forms the release lever. In particular, in this embodiment, the rotary latch is preferably provided with an arm for latching in the position Vorrast, which is separated from the usually deformable arm with the latching surface by a recess. In the pre-rest position, one arm of a detent pawl, preferably a second pre-detent pawl, engages that arm of the detent so as to lock the detent in the pre-detent position. This embodiment makes it possible to provide a predetermined bending point on the catching arm and at the same time to provide a latching surface for the pre-locking pawl in a spatially desired manner. This arm for the pre-locking pawl extends in particular beyond the plane which is provided by the base of the rotary latch. This makes it possible to provide a release lever above the pawl for the position main rest, which also forms a pre-locking - pawl.

The locking mechanism comprises in one embodiment a blocking lever which is able to block the pawl in its locked position. The pawl can not leave its detent position when it is blocked by the blocking lever. By blocking lever, the locking mechanism can be locked particularly reliable.

In order to enable a compact design with a small number of parts further improved, pawl and release lever of the locking mechanism are rotatably mounted in one embodiment on a common axis.

Advantageously, the catch is biased by a spring in the direction of the open position to be able to initiate a moment in the pawl even without the presence of a door seal pressure.

In one embodiment of the invention, the release lever is capable of moving a blocking lever of the locking mechanism out of its blocking position. For this purpose, in principle, a relatively small amount of force is sufficient. If the pawl subsequently moves due to an opening moment, which is introduced by the catch into the pawl, out of its detent position, it is advantageous overall very little effort that must be expended for opening the locking mechanism.

In one embodiment, there is a spring for moving the blockage lever to its blocking position. In a simple and reliable way, the blocking lever can be moved by the spring in its blocking position. In one embodiment, blocking lever and pawl are designed so that by moving the blocking lever in its blocking position, the pawl is thereby simultaneously moved into its locked position. The number of parts needed is minimized further. This goes hand in hand with a reduction in weight as well as a reduction in the installation space.

The release lever comprises in one embodiment three lever arms. By means of a first lever arm in particular a blocking lever is moved from its blocking position for unlocking the locking mechanism. By means of a second lever arm of the release lever, the pawl is preferably relieved in the manner described, so at least during opening of the locking mechanism, the spring force is reduced, which is able to move the pawl in the detent position. Preferably, this second lever arm advantageously further comprises a driver for moving the pawl out of its locking position in order to be able to produce compact and simple. The third lever arm actuates the release lever, for example by means of a linkage or Bowden cable, preferably with the aid of a handle or electric drive connected thereto. When the handle is actuated or the electric drive is actuated, the third lever arm is actuated thereby and the release lever is moved for unlatching of the locking mechanism, in particular pivoted about an axis. Advantageously, there is also a stop in particular for the purpose of minimizing the installation space and the weight for the second lever arm to prevent the release lever is moved beyond a desired end position.

The pawl preferably comprises two lever arms. With a lever arm, the catch is locked. On the other lever arm, a mechanism such as a preloaded spring acts to move the pawl by means of the mechanism, so for example a preloaded spring in its locked position can. This other lever arm of the pawl is optionally detected by a driver of the release lever for unlocking the locking mechanism and moved accordingly, in particular pivoted about an axis. Advantageously, there is also a stop for this other lever arm to prevent the pawl from being moved beyond its full detent position.

A blocking lever for blocking the pawl in its latched position preferably comprises two lever arms. A first lever arm of the Blocking lever is able in particular to block the pawl in its latched position and / or to move the pawl into its latched position. In particular, this first lever arm can advantageously also be detected in one embodiment of the release lever and moved out of its blocking position, in particular to be pivoted about an axis. The second lever arm of the blocking lever can preferably be moved against a stop, in order to avoid that the blocking lever can be moved beyond an intended end position. The provision of a second lever arm also advantageously contributes to shifting the center of gravity of the blocking lever in the direction of the axis about which the blocking lever can be pivoted. This shift of the center of gravity facilitates pivoting of the blocking lever.

In one embodiment, the blocking lever can at the same time form the release lever in order to minimize the parts. The release lever is in one embodiment at the same time a pre-locking pawl, which is able to lock the catch in the position Vorrast. The locking mechanism can then close a door or flap. It is then not yet scheduled locked in the position main rest. The position of the main catch is only reached starting from the position of the first catch when the catch is pivoted further in the direction of the closed position.

An inventive locking mechanism is mounted in particular on a usually made of metal lock plate or a usually made of metal lock case. Usually, such a lock also includes a lock housing, which is usually made of plastic and which is able to shield components of the castle to the outside. In addition, there may be a particular existing plastic lock cover and / or a particular existing plastic cover for a central locking, which also serve the shield. For example, the castle can become one Door or a flap of a building or belong to the door or a flap of a motor vehicle.

The invention also encompasses such a lock having a pawl for the main catch position of the catch (also called a "main catch pawl"), a pawl for the pre-catch position of the catch (also referred to as a "pre-catch pawl"), and advantageously a blocker lever for said catch Main ratchet pawl. Such a lock is in print DE 10 2008 061 524 A1 mentioned. However, a lock according to the invention may also comprise, in addition to a blocking lever, only one pawl for locking the catch in a position "pre-rest position" and a position "main rest".

The catch has a fork-shaped inlet slot into which a locking pin of a door or flap enters when the vehicle door or vehicle door is closed. The locking pin then rotates the catch from an open position to a locked position. In the locked position, the locking bolt can no longer leave the inlet slot of the rotary latch. The pawl locks the catch in the locked position, so that it can not be moved back into the open position.

In a lock according to the invention, there are components such as pawl, blocking lever or rotary latch, which can and should be pivoted. There is regularly at least one prestressed spring, in particular leg spring, with which a desired pivoting movement of such a component is effected by spring force. Such a prestressed spring is capable, for example, of moving a pawl into its detent position, of moving a blocking lever into its blocking position or of turning a catch into its open position.

The rotary latch is able to initiate an opening moment in the detent position in the detent position. In particular, the catch does not introduce a closing moment into the pawl, at least not if the pawl is not deformed by excessive load. A Excessive loading is generally not present when, in the closed state of a door or a flap, no additional external forces (in addition to an internally occurring force such as due to a door seal pressure) are introduced into the locking mechanism. Excessive loading of a locking mechanism can occur, in particular in the event of a crash, when high forces are introduced into the locking bolt of a door or flap in the opening direction of the door or flap.

A predetermined bending point in the sense of the present invention can be spatially limited or extend over a relatively long range. However, the catch may also be such that it deforms altogether under excessive load so that the overlap is at least maintained or increased.

Show it

FIG. 1:

Lock in locked state

FIG. 2:

Comparison between the width of a pawl arm of conventional Gesperren with a locking mechanism according to the invention

FIG. 3:

another embodiment of the invention

FIG. 4:

enlarged view of the embodiment according to FIG. 2

In the FIG. 1 a locking mechanism of a lock of a motor vehicle comprising a rotary latch 1, a pawl 2, a blocking lever 3 are shown, which are rotatably mounted on a lock case 4. The rotary latch 1 can be pivoted about its axis 5. The pawl 2 can be pivoted about its axis 6. The blocking lever 3 can be pivoted about its axis 7.

It should be noted that the invention is explained on a consisting of several pawls, so-called Mehrklinkengesperre existing lock. However, the invention expressly refers not only to Mehrklinkengesperre, but is transferable to all other locks with a locking mechanism.

The pawl 2 locked with its locking surface 8, the rotary latch 1, which rests with its locking surface 9 of its catching arm 10 on the locking surface 8 of the pawl. The position of the locking surfaces 8, 9 to each other in this embodiment is chosen such that the rotary latch 1 initiates an opening moment in the pawl 2. By the opening moment, the pawl 2 can be pivoted out of its locked position shown in the case of FIG. 1 by turning clockwise about the axis 6 when the blocking lever 3 is moved out of its blocking position by operating an inside or outside operation.

The overlap between the two locking surfaces 8 and 9 is such that the pawl 2 by a few degrees, in particular less than 14.1 °, preferably less than 12.9 ° clockwise must be pivoted so that the catch pivoted in the direction of opening position and thus the Lock can be opened. The larger the overlap, the more must the pawl 2 in the case of FIG. 1 swivel clockwise to open the ratchet.

The rotary latch 1 has a catching arm 10 and a load arm 11. The tentacle 10 is provided with a predetermined kink 12. The predetermined bending point can be provided by a preferably arcuate recess from one side or as shown from both sides of the tentacle. If an excessively large force, for example, due to a Chrashfalls exerted on the held by the catch 1 locking bolt 13 and so the load arm 11 is pulled in the opening direction, then the tentacle 10 buckles due to the predetermined bending point 12 around the predetermined bending point 12 around and that relative to the load arm 11 opposite to the clockwise direction. This deformation can be plastic and / or elastic. As a result, the engagement point between the locking surface 9 and the locking surface 8 is displaced in such a way that the overlap between the two locking surfaces 8 and 9 is increased.

The rotary latch 1 has an arm 14 which extends into a plane which is located above the plane in which the base surfaces of the rotary latch 1 and pawl 3 are located. Above the pawl 2, an unillustrated release lever is provided on the axis 6, which at the same time forms a pre-locking pawl. In the pre-rest position, the arm 14 rests against this pre-locking pawl, so that the locking mechanism can additionally be latched in a pre-locking position. The Vorrastarm 14 is formed integrally with the rotary latch 1 in this embodiment as a fold. But it is also possible to form the Vorrastarm 14 as a separate bolt and to attach to the catch 1. The catch 1 can also have an arm 15, which can be moved against a stop, for example, to prevent excessive pivoting of the catch.

The tentacle 10 does not necessarily have a tapered area, that is to say a recess 12, in order to be able to be deformed in the desired manner. Alternatively, one or more depressions can be introduced into the rotary latch 1 on one or both sides. As a further alternative or in addition, the rotary latch 1 may have undergone a heat treatment, so that a predetermined bending point is formed.

But it may also be sufficient that this tentacle 10 is designed sufficiently narrow over its entire length in order to be able to be bent over this area in the manner described. Alternatively or additionally, the load arm 11 can also be provided with a tapered region between the axis 5 and the illustrated position of the locking bolt 13 and / or be narrow. In the case of an excessive load then the load arm 11 was bent, for example, around its tapered portion around, which would also lead to an increase in the coverage between the two locking surfaces 8 and 9.

It depends therefore above all on that the catch is designed so that in case of excessive load by the locking pin 13 the Rotary latch is deformed so that the overlap between the locking surfaces 8 and 9 at least not smaller. Preferably, this coverage is greater even under excessive load.

In the FIG. 1 a prestressed leg spring 16 is shown, which is able to move the blocking lever 3 in the blocking position. Against the force of this spring 16, the blocking lever 3 must be pivoted counterclockwise about its axis 7 in order to open the locking mechanism. Blockade lever 3 and pawl 2 are shaped so that the blocking lever 3 is able to move the pawl 2 into its locking position. A mounted on the lock case 4 stop 17 prevents the pawl 2 can be moved counterclockwise opposite to its locking position out.

In a further advantageous embodiment is additionally or exclusively a recess 18, which is arranged at the catching arm 10 of the rotary latch 1 on the side facing the locking bolt 13. It is thus obtained a relatively long physically effective lever, without having to increase the space accordingly, in comparison to the case that a recess is provided in the form of a notch on the side facing away from the locking bolt side. In the case of excessive loading then the coverage increases particularly strong. A notch occurs when the locking bolt, starting from the open position over a step-like course 19 of the contour of the tentacle 10 must be moved away to in the in FIG. 1 to reach the closed position shown.

In the FIG. 2 is illustrated by a dashed line, as an inventive latching arm 1 of a pawl 2 can be performed in comparison to a conventional width of a latching arm of a conventional pawl. A pawl 2 according to the invention thus differs from a conventional pawl by the lateral contour curve shown in dashed lines, which leads to a narrower latching arm. The smaller width the locking arm 18 and hereby the locking surface 8 has the consequence that a smaller pivoting movement of the pawl is sufficient so that the locking mechanism can be opened.

The FIG. 3 illustrates the presence of a bulge 19 at the other arm of the pawl 2, so as to further save weight and volume. This bulge 19 is located on the side facing away from the stop 17.

Particularly advantageous is a notch 20 which is arranged at the tentacle 10 of the rotary latch 1 on the side facing the locking pin 13. It is thus obtained a relatively long physically effective lever, without having to increase the space accordingly, in comparison to the case that a notch on the side facing away from the locking pin 13 side is provided. In the case of excessive loading then the coverage increases particularly strong. A notch is present when the locking pin 13, starting from the open position over a step-like course 21 of the contour of the tentacle 10 must be moved away to in the in the FIG. 1 to reach the closed position shown.

In the FIG. 4 is fragmentary and enlarged the locking arm 18 of the pawl 2 and the tentacle 10 of the rotary latch 1 is shown, wherein the course shown in dashed lines represents the deviation of the particularly preferred embodiment of the invention compared to a conventional course. The contact point of the catching arm 10 of the rotary latch on the latching surface 8 of the pawl 2 in the latched state of the locking mechanism is arranged so that the distance 22 to one, shown on the left end of the locking surface 8 is smaller than the distance 23 to the other opposite end of the locking surface 8., in particular the FIG. 1 illustrates, the end shown on the left is the end over which the tentacle 10 of the catch 1 must be moved to detent the locking.

The length of the distance 22 is about 30% of the sum of the two sections or distances 22 and 23 and thus about 30% of the width of the locking surface. 8

LIST OF REFERENCE NUMBERS

• 1: catch
• 2: pawl
• 3: Blockage lever
• 4: lock case
• 5: rotary latch axis
• 6: common axis of pawl and release lever
• 7: Blockage lever axis
• 8: locking surface of the pawl
• 9: Detent surface of the rotary latch
• 10: catching arm
• 11: load arm
• 12: predetermined kink point
• 13: Locking bolt
• 14: Arm for latching in the position Vorrast
• 15: poor
• 16: leg spring
• 17: stop for blocking lever
• 18: locking arm of the pawl
• 19: bulge
• 20: recess
• 21: step-like Konturverlauf22: first portion of the locking surface of the pawl
• 23: second portion of the locking surface of the pawl

Claims (9)

1. Lock for a door or flap comprising a locking mechanism having a catch (1) and at least one pawl (2) for latching the catch (1), wherein a latching surface (8) of a latching arm (18) of the pawl (2) is such way that swiveling the pawl (2) by up to 16.1°, preferably by up to 14.6°, particularly preferred up to 12.9°, is enough to unlatch a latched locking mechanism, and the catch (1) comprises two spaced apart recesses as predetermined buckling line (12), which is provided in an arm of the catch (1) and which faces a locking bolt (13) in a locked condition of the locking mechanism, wherein the predetermined buckling line (12) has the effect that, at excessive load, the distance between the free ends of a catching arm (10) and a load arm (11) of the catch (1) increases in the latched condition of the locking mechanism.
2. Lock according to claim 1, characterized in that the supporting point of the catching arm (10) of the catch (1) is arranged on the latching surface (8) of the pawl (2) in the latched condition of the locking mechanism in such a way that the distance (22) to the one end of the latching surface (8) is smaller than the distance (23) to the other opposite end of the latching surface (8), wherein the one end is the end, over which the catching arm (10) of the catch (1) has to be moved in order to unlatch the locking mechanism.
3. Lock according to the preceding claim, characterized in that the distance (22) from the supporting point to the end of the latching surface (8) amounts up to 40 % of the width of the latching surface (8) of the pawl (2), preferably up to 30 %.
4. Lock according to one of the preceding claims, characterized in that swiveling a release lever of the locking mechanism by up to 20°, preferably by up to 16°, is enough to move the pawl (2) out of its latching position by means of a cam.
5. Lock according to one of the preceding claims, characterized in that it is composed in a way that the locking mechanism cannot be opened through forces between 10 kN to 30 kN, preferably between 20 and 30 kN.
6. Lock according to one of the preceding claims, characterized by a cam that allows to move the pawl (2) out of its latched position.
7. Lock according to the preceding claim, characterized in that the cam is arranged in a way that it moves the pawl (2) out of its latched position only when the pawl (2) is not moved out of its latching position due to an opening moment of force, which is induced by the catch (1) into the pawl (2) in its latching position.
8. Lock according to one of the preceding claims, characterized in that the catch (1) is composed such that it is deformed by excessive load in the latched condition in such a manner that the overlap between the pawl (2) and the catch (1) is maintained or increases.
9. Lock according to one of the preceding claims, characterized by an arm (14) of the catch (1) by which the catch can latched in a pre-latched position, wherein the arm (14) ends preferably outside of the main plane of the catch (1).

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