EP1954902A1

EP1954902A1 - Closure for flaps or doors of vehicles

Info

Publication number: EP1954902A1
Application number: EP06818620A
Authority: EP
Inventors: Rolf Kamps; Jörg BERGHAHN; Dirk Ruppach; Artur Torka
Original assignee: Huf Huelsbeck and Fuerst GmbH and Co KG
Current assignee: Huf Huelsbeck and Fuerst GmbH and Co KG
Priority date: 2005-11-28
Filing date: 2006-11-17
Publication date: 2008-08-13
Also published as: WO2007059897B1; WO2007059897A1; DE102005056788B4; DE102005056788A1

Abstract

A closure of this type comprises a lock and a closing part (50). The lock includes a rotatable latch (10) and a spring-loaded pawl (20). The latch (10) has at least one catch (12) and the pawl (20) has a mating catch (21). Starting from the open position, during closure of the flap the latch (10) is transferred via the closing part (50) into a catching position. So that the catch (12) reliably drops into a corresponding mating catch (21) of the pawl (20), it is proposed to provide the rotatable latch (10) with a retaining shoulder (30) which can be rotated at the same time and/or with a control cam (31) which, during closure of the flap, makes contact indirectly or directly with the pawl (20) even before the catching position is reached and temporarily secures said pawl in a defined contact phase (20.1). The latch catch (12) and the pawl mating catch (21) are at a distance from each other in this contact phase (20.1). A closure phase of the latch movement then begins. The latch (10) is rotated back in the direction of its catching position by means of elastic resetting forces. The catch (12) and the mating catch (21) come reliably into engagement.

Description

Closure for flaps or doors of vehicles

The invention is directed to a closure of the type specified in the preamble of claim 1. As a rule, the lock is on the movable body part of the vehicle, such as a flap or door. For the sake of simplicity, this body part will be referred to below as "flap." The lock cooperating with the lock is located on the stationary bodywork part could be realized in the opposite way.

Such a closure is known from DE 199 29 103 Al. When closing the flap, problems arise because the pawl often does not reliably engage behind the catch in the case with its counter-locking. This is due to the elastic seals between the flap and the flap opening in the body, which are compressed when closing and thereby exert a restoring force between the trap and the closing part. It comes with the known closures to closing disorders.

DE 103 12 093 A shows a closure which is intended to block the motor for the electric opening of the trap via a latching lever, as a result of which the engine switches off. This occurs when the door is frozen and the latch can not be rotated to its open position due to its spring load to release the latched part that has been detected. The latching lever has in addition to a decisive for the blockage of the motor stop arm nor a latching arm which is supported in a blockage case of a cranking of the pawl and finally a Aushebearm, which cooperates with a control cam of the case when it moves from its detent position to an open position , This open position is achieved by a manual opening of the flap, in which solves the frozen trap. This closure does not address the aforementioned problems when closing the flap. The invention has for its object to develop a closure of the type mentioned in the preamble of claim 1, which reliably eliminates these closing difficulties. This is inventively achieved by the measures specified in claim 1, which have the following special significance.

The rotatable latch provides a mitdrehbare retaining shoulder and / or a control cam that when closing the flap is contacted before reaching the locking position the pawl. During this contact phase, a radial distance is provided between the latching latch and the pawl counter latching, but if the latch 10 is further rotated beyond the latching position as far as an overhanging position on further closing of the flapper , then this contact phase is terminated and it begins a targeted leadership of the pawl counter-detent with respect to the latch of the catch.This process will be briefly referred to as the "closing phase" of the movement between the latch and the pawl.

During this final phase, restoring forces of an elastic material, e.g. the above-mentioned seals between the flap and the body between the trap and the locking member engaging therein. The result is that the case is rotated back from its overhanging position in the direction of its rest position. In this final phase, the pawl is due to their spring load on the trap contour. When turning back the trap, therefore, it slides on the trapezoid contour in the direction of the catch. This system provides alignment between the pawl counter catch and the latch catch.

This ensures that, finally, results in a reliable engagement between the latch and the latch in the locking position. In the final phase, the trap contour therefore has the new function of bringing the pawl into safe engagement with the trap. To malfunction when closing the flap, which is equipped with the closure according to the invention, so it can not come. Further measures and advantages of the invention will become apparent from the dependent claims and the drawings. In the drawings, the invention is illustrated in three embodiments. Show it:

1 shows a first embodiment of the invention, where a latch in a pre-locking position and the associated pawl are in a contact phase position,

Fig. 2 shows the closure of Fig. 1, when the trap is in a

Overtravel and the pawl are in a final phase position,

3 + 3 ', a second embodiment of the closure according to the invention, where the trap is in a boundary position and the pawl in its contact phase position, wherein Fig. 3 shows the front view and Fig. 3' show the rear view of the closure,

4 shows the closure already shown in FIG. 3 when the trap is in its overstroke position 0.4 and the pawl is in its final phase position, FIG.

Fig. 5 shows a third embodiment of the invention

Closure, where the trap is again in a limit position between a pre-rest and a main rest while the pawl is in its contact-phase position,

FIG. 6 shows the third embodiment shown in FIG. 5 in a further operating phase, in which the case is in an overstroke position and the pawl is in its final phase position, and FIG 7 shows a further phase of operation of the third shown in FIGS. 5 and 6

Closure, where the trap their latching position and the latch occupy a final phase position.

In the drawings, matching components in the three versions are always given the same reference numerals, even though the appearance of these components should be different. That facilitates the overview. The three versions of the invention basically have the following structure, as will be explained with reference to the first embodiment in FIGS. 1 and 2.

The lock consists of a rotatable latch 10, which is accommodated on a stationary pivot bearing 15 and a spring-loaded pawl 20 which is pivotable on a stationary bearing 25. The latch 10 not only has the catch 12 mentioned in claim 1, which in the three embodiments is a so-called "main catch", but also an upstream latch 1 1, which only partially closes the tailgate Main catch 12. The preliminary catch 11 and the main catch 12 cooperate with a counter catch 21 of the latch 20.

When the flap is opened, the trap 10 assumes a so-called "open position", which is not shown in any more detail in the drawings.This open position of the trap 10 is determined by end stops and a spring load 14. If the flap is closed, starting from the open position Thus, moved in the direction of the stationary body part, the closing part 50 moves into a receptacle 13 of the case 10 and exerts a torque on the case 10, which is opposite to their spring load 14.

In Fig. 1, although a Vorrastlage 10.1 of the case 10 is shown, but it is crucial that even then the pawl 20 comes into contact with a support point 42 formed as a lever 40 intermediate member. Upon contact there is a mutual support between a counter-shoulder 22 of the pawl 20 and the support point 42 from the lever 40. This contact position is effected by a retaining shoulder 30 and a control cam 3 1, which are located on the case 1 0 and therefore be turned. This "contact phase" mentioned at the outset is characterized in that the pawl 20, which in turn is under a spring load 24, is temporarily held in the pivot position indicated by the auxiliary line 20. If, starting from FIG Further rotated by arrow 5 1, the pawl counter catch 21 can pass by the catch main catch 12 without falling in. The rotation of the catch 1 0 can be manual or motorized.

At the latest when a "Überhublage" characterized by the auxiliary line 10.4 in Fig. 2 of the case 10 is reached, the contact phase is terminated by the lever 40 is raised by means of the control surface 31 on the case 10. Thus, the lever support point 42nd is moved away from the pawl counter-shoulder 22 and the pawl 20 is free.The free pawl 20 is then moved due to acting on her own spring load 24 on the case 10 until it comes to a contact between a projection 23 and a contour of the In the overstroke position 10.4 of Fig. 2, the pawl counter catch 21 is already aligned with the latch main catch 12, but there is a gap 26 caused by the overstroke between them.

However, if, as already mentioned, the elastic restoring forces turn back the latch 10, the gap 26 becomes progressively smaller, wherein the pawl 20 with its abutment projection 23 is guided exactly along the trapezoidal contour 16. This ensures that in a main locking position (not shown here in detail in the third version of Fig. 7), the pawl counter catch 21 hits the latch main catch 12 with great reliability. The flap 10 is properly closed.

The lever 40 is pivotally mounted on a stationary bearing 45 and is positioned in the apparent from Fig. 1 contact phase 20.1 of the pawl 20 of a retaining shoulder and / or a control cam 31. The crease shoulder 30 and the control cam 3 1 are an integral part of the case 10. The cam 3 1 and the retaining shoulder 30 on the case 10 cooperate with a counter-control point 41, which is an integral part of the lever 40. As shown in FIG. 2, the components 3 1, 30, 41 have the task, in the recognizable from Fig. 2 Überhublage 1 0.4 the above Contact phase between the pawl 20 and the lever 40 to end. Due to the compressed seals between the case and body, there is a reverse rotation of the case 10, where the closing member 50 moves in the direction of the arrow 52 of Fig. 2. Then the pawl 20 comes with its abutment projection 23 in contact with the contour 16 of the case 10. The pawl 20 is then in the marked by the auxiliary line 20.2 final phase position. The pawl counter catch 21 drives reliably against the main catch 12 of the case 1 0.

In the lock housing, a recognizable in Fig. 1 and 2 sensor 46 is provided, which consists in the present case of an electric micro-switch having an actuator 43. The signals of the sensor 46 are forwarded via a signal line 55 to an electrical control unit not shown in detail. This sensor 46 can determine the relevant positions of the intermediate member 40 and thus the pawl 20, evaluate and / or display. Thus, it can be clearly determined whether the pawl is in its contact phase position 20.1 of FIG. 1 or the final phase position 20.2 of FIG.

Thus, the elements of the lock components do not interfere with each other, the retaining shoulder 30 and / or the control cam 31 is disposed on the case 1 0 in a different plane than its contour 16 and its two notches 1 1, 12. In accordance with Retaining shoulder 30 and the control cam 3 1 but the counter-control surface 41 is arranged by the lever 40.

The lever 40 can also fulfill the function of a so-called "snow load lever" when opening the flap, because it provides for a distance position of the pawl 20 in the contact phase position 20. 1 of Fig. 1. When the tailgate is opened manually, the closing part 50 moves In the sense of the above-mentioned movement arrow 52 of Fig. 2. At the case 10 is a radial cam 17, which moves in the sense of the dash-dotted Drehpfcils 47 of Figure 2. Then the cam 17 abuts against the provided on the lever 40 counter control point 41, through which then the contact phase position 20. 1 of the pawl 20 is eliminated with certainty. Figs. 3 and 4 illustrate a second embodiment of a closure according to the invention, where the same reference numerals as in Figs. 1 and 2 are used to denote analogous components. In that regard, the previous description applies. All you have to do is address the differences.

A significant difference is that between the case 1 0 and the pawl 20, two interconnected intermediate members 35, 40 are arranged. The first intermediate member is also a lever 40 and the second a rod 35. The rod 35 is connected via a hinge point 33 with the lever 40. The rod 35 has a retaining shoulder 30 and the lever 40 a support point 42 for a counter-shoulder 22 of the pawl 20. This can be seen particularly well from Fig. 3 and 3 ', showing opposite sides of the closure.

In Fig. 3, 3 'is again a contact phase position 20. 1 of the pawl 20 before, where the mutual support of the lever support point 42 on the pawl counter shoulder 22 on the one hand and the rod counter-support point 34 and the Fallen Haltcschulter 30 on the other he follows. Incidentally, the retaining shoulder 30 on the latch 10 is formed by the cam 1 7 already described in the first exemplary embodiment, which in this second exemplary embodiment may also have the further function of serving to trigger in the event of snow load. This is illustrated again in FIG. 3 'by the dot-dashed opening movement 47. While the outer flank of the cam 17 forms the mentioned retaining shoulder 30 of the latch 10, the cam inner flank 18 acts in the event of snow load.

A spring load 44 is, as shown in FIGS. 3 and 4, via a member and the rod 35 on the lever 40 exerted. In Fig. 4, the case 1 0 is again in a Überhublage 10.4, where the preceding contact phase 20.1 of the pawl 20 of FIG. 3 is completed. The pawl 20 comes in an illustrated by a Hilfsl inie 20.1 final phase position, where the projection 23 is supported on the Fallen contour 16. Between the pawl counter catch 21 and the latch main catch 12 is in the Überhublage 10.4 a free gap 26 before, which ensures the engagement with security during reverse rotation 52 of the case 1 0. Also in the third embodiment of Fig. 5 to 7, only the differences from the preceding two embodiments will be described, while in other respects the previous description applies. An essential difference is that an auxiliary link 36 via Drehanschlagmitte] 28, 29 is connected to the case 10. The rotation stop means 28, 29 allow a limited rotational play between the auxiliary member 36 and the case 10th

Another peculiarity is that the spring load 14 of the latch 10 acts primarily on the auxiliary member 36 and is secondarily transmitted via the rotation stop means 28, 29 to the case 10. The auxiliary member consists here of a two-armed lever 36 which is coaxial with the case 1 1 and in the present case to its storage even the pivot bearing 15 of the case 1 1 uses. The case 1 1 and the intermediate lever 16 are in surface contact with each other.

In this case, a contact phase position 20.1 of the pawl 20 is present, while the case 10 assumes a limit position clarified by the auxiliary line 10.2. The guide pin 28 is then located at the lower end of the gate 29. The one arm 38 of the lever 36 has at its end a retaining shoulder 30, which is supported in this case on a counter-shoulder 22 of the pawl 20. The counter-shoulder 22 is formed by the latch 10 facing inner surface of a lug 48 which sits on the pawl 20. In the contact phase position 20.1 of the pawl of Fig. 5, a distance 27 between the main catch 12 and the counter-latch 21 is again generated. As a result, the case 10 can continue to rotate in the counterclockwise direction, wherein the detected closing part 50 is entrained in the direction of the arrow 51.

Then the case 10 arrives in the position shown in FIG. 6, in which it is again in an overthrust position illustrated by the auxiliary line 10.4. The preceding limit position 10.2 of FIG. 5 is illustrated in phantom in FIG. As can be seen, the trap has rotated further in the direction of arrow 56. Due to this rotation 56 of the case 10 and the two-armed lever 36 has been taken over the Drehanschlagmittel 28, 29, whereby the am Shoulder 30 located at the end of the arm 38 has released the pawl countershoulder 22. The pawl 20 can then move due to their spring load 24 against the case 10 until its projection 23 is again supported on the contour of the case 1 0. It comes to the gap 26 between the pawl mating latch 21 and the latch main latch

1 2.

In Fig. 7 of Fig. 6 subsequent operating state of the lock components is shown. The pawl 20 is still in its final phase 20.2, but the case 10 has rotated back from its overstroke position 10.4 to a main pawl position 10.3 in the direction of the arrow 57 of FIG. However, this rotation 57 has not taken part of the lever 36, because the guide pin 28 can move to the upper end of the link 29. The arm 38 of the lever 36 is supported by a spring load 53 to be described later elastically on the upper edge of the pawl-48 approach. Such a support may also be present in FIG. 6 in the overtravel position. In the main latching position 10.3 of the latch, the latch counter catch 21 engages behind the latch main latch 12.

In this third embodiment and, if necessary, in the second and first embodiment, the spring loads 14, 24 of the case 10 and pawl 20 are generated by the same spring element 53, for example by a tension spring. The one end of the spring element 53 is, as shown in FIGS. 1 and 5, attached to an attack point 19 in the case 1 0, while the other end of the spring at an attack point 49 of the pawl 20 engages.

Reference number list:

10 cases

10.0 Disclosure of 10

10.1 Pre-rest position of 10

10.2 Borderline of 10

10.3 Main Posture of 10

10.4 Overhead position of 10 11 pre-rest of 10

12 main load of 10

13 recording for 50 in 10

14 spring load of 10 15 pivot bearings of 10

16 trap contour of 10 (Fig.2)

17 cams, release cams for snow load effect (Fig.1 to 4)

18 inner edge of 17 (FIG. 3 ')

19 point of attack from 53 to 10 or 36 (Fig.1, 5)

20 pawl

20.0 rest position of 20

20.1 contact phase position of 20 (Fig.1)

20.2 final phase position of 20 (FIG.

21 Gegenrast to 20

22 counter-shoulder to 20

23 projection on 20 for 16 (Fig.2)

24 spring load of 20

25 pivot bearings from 20

26 overstroke gap between 21, 12 (Fig.2)

27 Distance between 21, 12 (Fig.5)

28 first rotary stop means between 36, 10, slide pin (FIGS. 5 to 7)

29 second rotary stop means between 36, 10, slide (Fig.5 to 7)

30 holding shoulder of 35 or 38 (FIGS. 3, 3 ', 4 to 6) 31 control curve for 20 Anlenkstelle for 35 (Fig. 3, 4) counter support members on 35 for 30 (Fig. 3, 4) second intermediate member, rod (Fig. 3 to 4) auxiliary member, lever (Fig. 5 to 7) first arm of 36 (Fig. 5 to 7) second arm of 36 (Figures 5 to 7) limited play between 28, 29 (Figure 5) intermediate member, lever counter-control point to 40 (Figure 1) support point to 40 for 22 (Figure 3) actuator for 45 (Fig. 1, 2) Spring load of 40 (Fig. 3, 4) Swivel bearing for 40 sensor, microswitch (Fig. 1, 2) Opening movement of 10 in the case of snow load approach to 20 for 22 (Fig. 5) point of attack for 53 to 20 Closing part Relative movement of 50 when closing Relative movement of 50 during reverse rotation Common spring element for 14, 24 Spring element for 44, leaf spring (FIG. 1) Signal line of 46 (FIG. 1) Arrow of further rotation of 10 (FIG. 6) Arrow of reverse rotation of 10 (Fig. 7)

Claims

Patent claims:

Closure for flaps or doors of vehicles,

with a lock and a locking part (50) that interacts with it,

wherein the lock comprises a rotatable latch (10) and a spring-loaded pawl (20),

the latch (10) has at least one catch (11, 12) for a counter catch (21) of the pawl (20),

The latch (10) receives the closing part (50) in an open position where the flap can be opened, while the spring-loaded pawl (20) rests on a contour (16) of the latch (10), to which the catch also rests (11, 12) belongs,

When the flap is closed, the latch (10) is transferred to a locking position (10.3), where the shoulder of the latch falls into the latch catch (12) and thereby holds the flap in its closed position,

characterized ,

that the rotatable latch (10) has a rotatable retaining shoulder (30) and/or a control cam (31), which directly or indirectly contacts the pawl (20) (42) when the flap is closed (51) before the locking position (10.3) is reached , 22) and is then in a contact phase (20.1),

that during the contact phase (20.1) there is a distance between the latch catch (12) and the pawl counter catch (12), but that the pawl (20) is released when the latch (10) is further rotated (51) when the flap is closed further beyond its locking position (1 0.3) to an overstroke position (1 0.4) and the contact phase (20. 1) ends,

that in a final phase (20.2) the latch is rotated back (52) from its overstroke position (1 0.4) into its locking position (10.3) by restoring forces of an elastic material

that in the final phase (20.2) the pawl (20) rests on the latch contour (16) due to its spring load (24) and when the latch (10) is turned back (52) along the latch contour (16) in the direction of the catch to be led,

and that this guidance ensures that the pawl counter-catch (21) is aligned with the latch catch (12) and ultimately ensures reliable engagement in the locking position (10.3).

2.) Closure according to claim 1, characterized in that the holding shoulder (30) is an integral part of the latch (10) and has a control cam (31) for at least one intermediate member (40) which is in the contact phase (20.1) with the pawl (20) interacts

and that in the contact phase (20.1) the intermediate link (20) is supported on a counter shoulder (22) of the pawl (20).

3.) Closure according to claim 2, characterized in that the intermediate member is a pivotally mounted (45) lever (40) which is positioned by the holding shoulder (30) and / or its control cam (3 1) during the contact phase (20. 1). and has a support point (42), and that the support point (42) is supported on a counter shoulder (22) of the pawl (20) in the contact phase (20.1) of the pawl (20).

4.) Closure according to claim 2 or 3, characterized in that the control cam (31) and the holding shoulder (30) cooperate with a counter control point (41) on the lever (40),

in order to end the contact phase, i.e. the support of the pawl (20) on the intermediate link (40), in the area of the overstroke position (10.4) of the latch (1 0).

and to let the final phase, i.e. the turning back of the latch (10), begin, where the pawl (20) comes to rest from its spring load (24) on the latch contour (16).

5.) Closure according to one of claims 2 to 4, characterized in that the pawl (20) has a contact projection (23) which during the final phase of the latch reversal ensures that the latch (20) rests on the latch contour (16 ) serves.

6.) Closure according to one of claims 1 to 5, characterized in that the intermediate member (40) and / or the pawl (20) have an actuator (43) for a sensor (46),

and that the sensor (46) determines, evaluates and/or displays relevant positions of the intermediate link (40) or the pawl (20) during the contact phase (20. 1) and/or the final phase (20.2) of the trap (20).

7.) Closure according to one of claims 2 to 6, characterized in that both the holding shoulder (30) and / or the control cam (31) on the latch (10) as well as a cooperating counter control point (41) on the intermediate member (40) are arranged in a different plane compared to the latch (20), its contour (1 6) and its catch (1 1, 12).

.) Closure according to one of claims 2 to 7, characterized in that the lever (40) also fulfills the function of a so-called "snow load lever" when the flap is opened and, in the event of snow load, interacts with a trigger cam (17) located on the latch (10). ,

in order to pivot the lever (40) or the pawl (20) back against their spring loads (44, 24) and end their contact phase.

9.) Closure according to claim 8, characterized in that in order to pivot away the pawl (20) in the event of snow load, the release cam (17) acts on the lever (40) via its counter control point (41).

0.) Closure according to one of claims 1 to 9, characterized in that between the trap

(10) and the pawl (20) two intermediate links (35, 40) coupled to one another are arranged,

that one intermediate link (35) has a holding shoulder (30) and the other intermediate link (40) has the support point (42).

and that in the contact phase (20.1) the second support member (40) is supported on the pawl counter shoulder (22).

1 1.) Closure according to claim 10, characterized in that the one intermediate member consists of a pivotally mounted (45) lever (40), while the other intermediate member is formed from a rod (35) articulated thereon (33) which has a counter-supporting piece (34) for the holding shoulder (30) on the latch (10).

12.) Closure according to claim 10 or 1 1, characterized in that the holding shoulder (30) is formed by the outer flank of a cam (17),

while the inner flank (18) of this cam (17) cooperates with the first intermediate link (40) when the lever (40) acts as a "snow load lever" when opening the latch (10).

3.) Closure according to claim 1, characterized in that the holding shoulder (30) sits on an auxiliary member (36) which is connected to the latch (10) via rotary stop means (28, 29),

that the rotation stop means (28, 29) allow a limited rotational play between the auxiliary member (36) and the latch (10),

that the spring load (14) of the latch (10) acts on the auxiliary member (36).

and that the spring load (14) is transmitted from the auxiliary member (32) indirectly, via the rotary stop means (28, 29), to the latch (10).

4.) Closure according to claim 13, characterized in that the auxiliary member consists of a two-armed lever (36) which is pivotally mounted coaxially to the pivot bearing (15) of the latch (1 1).

1 5.) Closure according to claim 14, characterized in that the intermediate lever (36) is in surface contact with the latch (1 1) and is pivotally mounted on the pivot bearing (1 5) of the latch (10).

6.) Closure according to one of claims 13 to 15, characterized in that the rotary stop means consist of a link (29) and a link pin (28) engaging therein.

17.) Closure according to one of claims 14 to 16, characterized in that a common spring load (53) acts between the pawl (20) and the auxiliary link lever (36).

and that the common spring load (53) generates, on the one hand, the spring load (14) of the latch (10) and, on the other hand, the spring load (24) of the pawl (20).

18.) Closure according to claim 17, characterized in that the common spring load (53) acts on one arm (37) of the lever (36).

and that the end of the other arm (38) is provided with the holding shoulder (30).

9.) Closure according to one of claims 13 to 1 8, characterized in that the counter shoulder (22) is formed by a shoulder (48) on the pawl (20).

20.) Closure according to claim 19, characterized in that the contour of the approach (48) is used to control the pawl (20) during the transition between the contact phase (20. 1) into the final phase (20.2).

21.) Closure according to claim 20, characterized in that in the over-stroke position (10.4) of the trap (10) the arm (38) having the holding shoulder (30) leaves the counter shoulder (22) and rests laterally on the shoulder (48).

and that in the final phase (20.2) of the pawl (20) the contact between the arm (38) and the shoulder (48) remains,

but a rotational play between the rotation stop means (28, 29) allows the latch (10) to be turned back to the locking position (10.3) between the latch detent (12) and the pawl counter-detent (21).

22.) Closure according to one of claims 1 to 21, characterized in that the latch (10) is also spring-loaded,

that the spring load (14) of the latch (10) and the spring load (24) of the pawl (20) are oriented in opposite directions to one another

and that both spring loads (14, 24) are generated by a common spring element (53).

23.) Closure according to claim 22, characterized in that the spring element consists of a tension spring (53), one spring end of which engages on the latch (10) (19), while the other spring end is attached to the pawl (20) (49). is.