EP0507266B1 - Shockproof safety belt buckle - Google Patents

Description

The invention relates to a seat belt buckle for receiving and locking a tongue with a housing and an insertion path arranged therein, containing an ejector under spring action, for the tongue, with a bolt mounted in the buckle and cooperating with the tongue recess in the event of locking, which latches the tongue in an associated manner Recess of the lock holds, and with a spring-loaded slide button guided transversely to the plane of movement of the bolt to release the lock, in the housing a locking and locking in the locking position of the lock and for unlocking the lock from the slide button in a release position for the bolt movable securing element is movably arranged and a compensating mass arranged movably in the closure housing is provided to compensate for acceleration forces acting on the closure.

A generic seat belt buckle is described in DE-A1-35 33 684; since, when acceleration forces acting on the closure occur, there is a risk that the slide button will slide into the closure body in the sense of an opening movement for the locking element holding the self-opening bolt in its locked position, a balancing mass is movable and spring-supported in the generic closure, which corresponds to the mass of the sliding key and which is therefore able to compensate for the acceleration forces acting on the sliding key.

The disadvantage of the generic closure is that the balancing mass acts essentially on the slide button and thus only indirectly secures the securing element against its opening movement; the structure of the closure and the arrangement of the balancing mass are complicated and expensive, and in addition the balancing mass is difficult to determine in terms of the required compensating force in its response threshold.

The invention is therefore based on the object of simplifying the construction of a generic seat belt buckle with regard to the arrangement of the balancing mass and of immediately improving the securing effect of the securing element when the buckle is subjected to shock loads.

This object is achieved, including advantageous refinements and developments of the invention, from the content of the patent claims, which follow this description.

The invention provides in principle that the balancing mass with the securing element is connected via a scissor-like linkage with two connecting rods for balancing mass and securing element, which are guided via a pivot point arranged on the housing, in such a way that the linkage has an opposing movement of the balancing mass and securing element relative to one another as positive guidance brings about. This is associated with the advantage that, due to the opposing movement of the securing element and the compensating mass caused by the positive guidance, the acceleration forces acting on the parts neutralize each other in the event of a stress, so that the securing element remains in its securing position which fixes the bolt in each stress situation. Because of the simple assignment and connection of the securing element and the balancing mass, the structure of the closure is advantageously simplified at the same time.

According to a preferred embodiment of the invention, the linkage is formed like a scissors with two rigid connecting rods guided over a pivot point fixed to the housing, the connecting rods being guided at their connecting points on the securing element and on the compensating mass in assigned elongated holes, in order to achieve a relative movement of the securing element and compensating mass to make each other possible. Alternatively, a fixed connection of the connecting rods with the securing element and / or the compensating mass can be provided, provided that the respective connecting rods themselves are designed to be resilient.

According to a preferred embodiment, the balancing mass is simultaneously designed as an abutment for the ejector spring, for which purpose the balancing mass according to Embodiment can range in the plane of the insertion path for the tongue with an approach, which in turn serves as an abutment. This has the advantage that when the insertion tongue is inserted and thus when the ejector spring is tensioned, the ejector spring increases the closing moment on the securing element via the balancing mass and thus improves the securing effect of the securing element even when subjected to shock.

In addition to the resilient supporting effect of the ejector spring, according to one embodiment of the invention, an additional spreading spring can be arranged between the balancing mass and the securing element, which holds and braces the two aforementioned parts at a mutual distance.

To simplify the construction, the masses of the securing element and the balancing mass are of the same size according to a first exemplary embodiment of the invention.

In the implementation of the invention, the sliding key spring can be supported directly on the securing element, which is associated with a comparatively simple structural design of the closure. Alternatively, it can be provided that the sliding key spring is supported against a projection of the closure fixed to the housing, which is associated with a more favorable force profile in comparison with the first-mentioned alternative.

Insofar as the sliding key spring is supported on the securing element, it is particularly advantageous according to one exemplary embodiment of the invention that the interacting parts sliding key, sliding key spring, securing element, connecting rods, compensating mass, ejector spring and ejector as a one-piece, uniform component are formed. In today's application of plastics technology, it is not a problem to connect partly rigid, partly springy elements in one piece or to design them as a single component. A particular advantage of this exemplary embodiment is that a particularly simple construction of the closure results and easy assembly is the result.

In such an embodiment of the invention, the connections between the balancing mass and connecting rods on the one hand and the securing element and connecting rods on the other hand are advantageously realized via spring straps connected by means of film hinges, which in turn provide an additional resilient spreading action of the balancing mass and securing element.

In a further embodiment of the invention, the scissor-type linkage is arranged between the balancing mass on the one hand and the sliding button and the securing element on the other hand, so that the balancing mass holds the sliding button and the securing element depending on the direction of the acceleration force. In this embodiment, the securing element is pivotally mounted and, due to its design and arrangement, it develops an opening moment when the closure is accelerated in the tightening direction, so that a holding function by the compensating mass is required in any case with respect to a proportionate mass of the securing element. Since in this embodiment the sliding button acts on the pivotable securing element, it can be provided that additional springs are arranged on the connecting rods running between the pivot point and sliding button, which are used to support the Provide the sliding button so that when appropriate deceleration forces act, the sliding button hits these springs located on the linkage and is braked; in an advantageous manner, the arrangement of a special sliding key spring for actuating the sliding key is not necessary.

According to a preferred embodiment, a bridge which can be placed on the U-shaped closure housing is provided, which in turn has a bore for receiving the pivot of the linkage, the bridge, the linkage with the connecting rods and with the associated pivot, and the balancing mass forming a structural unit. This is associated in a particularly advantageous manner with the possibility of designing the closure optionally with and without a shock protection structural unit because this structural unit is functionally separate from the locking function; thus the components of the closure as such can remain unchanged.

Preferably, the locking element pivotably arranged in the closure housing in this embodiment is positively coupled to the linkage via a pocket which interacts with the connecting rods, so that the intended positive guidance for the securing element results when the scissor-type linkage moves.

Due to the interaction of the balancing mass and the sliding key in the assigned direction of movement of the two aforementioned parts, the masses of balancing mass on the one hand and the sliding key with a proportion of securing element mass on the other hand are of the same size according to the invention.

In a further exemplary embodiment of the invention, the connecting rods of the scissor-type linkage arranged between the pivot point and the balancing mass are designed to be elastic, with the pivot pin of the linkage forming the pivot point being longitudinally displaceable in an associated elongated hole in the housing and the balancing mass in the two assigned acceleration directions of the lock in Housing is slidably disposed. In this embodiment, the closure is secured against accelerations by the movement of the balancing mass and the associated tension and displacement of the scissor-type linkage, in particular with the elastic connecting rods which are resiliently supported on the balancing mass.

In a preferred embodiment, the securing element rests on the bolt on both sides of its locking nose arranged elastically deformable locking surfaces such that in the unloaded position there is a distance between the locking element and the locking nose.

This is associated with the advantageous effect that a firm connection between the securing element and the bolt is created only under load. Since the securing element rests only on the elastically deformable locking surfaces without the action of a load, the opening forces of the closure for the movement of the securing element are lower. If there is a load, the locking surfaces deform elastically so that the securing element comes into contact with the locking lug. When the load ends, the locking surfaces deform back into their starting position, so that the closure is easy to open.

The securing element is preferably arranged on the bolt above the bending radius of the locking nose, so that the unlocking element does not have to be guided over the bending radius when unlocking, since this can possibly lead to incorrect locking of the closure.

Fig. 1 a - d

die Bewegungszustände des Verschlusses in einer schematischen Darstellung bei den verschiedenen Beanspruchungen,

Fig. 2

ein gegenständliches Ausführungsbeispiel des Verschlusses in einer Aufsicht,

Fig. 3

den Gegenstand der Figur 2 in einer Seitenansicht,

Fig. 4

die Teile des Verschlusses gemäß Figuren 2 und 3 in einer auseinandergezogenen Einzelteildarstellung

Fig. 5

ein anderes Ausführungsbeispiel des Verschlusses im Längsschnitt,

Fig. 6 a, b

ein anderes Ausführungsbeispiel des Verschlusses in einer Draufsicht, wobei oberhalb der Mittellinie (Fig. 6 a) die verriegelte Position des Verschlusses und unterhalb der Mittellinie die offene Position des Verschlusses mit gedrückter Öffnungstaste dargestellt ist (Fig. 6 b),

Fig. 7

den Gegenstand der Figur 5 längs der Linie A - A in Figur 6,

Fig. 8

den Verschluß in Freigabeposition des Riegels in einer der Figur 10 entsprechenden Darstellung,

Fig. 9 a, b

den Verschluß in einer Draufsicht, wobei oberhalb der Mittellinie der Verschluß bei Beschleunigung entgegen der Strammrichtung (Fig. 9 a) und unterhalb der Mittellinie der Verschluß bei Beschleunigung in Strammrichtung dargestellt ist (Fig. 9 b),

Fig. 10

den Gegenstand der Figur 9 ein Schnitt längs der Linie B - B in Figur 9.

In the drawing, exemplary embodiments of the invention are shown, which are described below. Show it:

Fig. 1 a - d

the states of motion of the closure in a schematic representation under the various stresses,

Fig. 2

a concrete embodiment of the closure in a top view,

Fig. 3

the object of Figure 2 in a side view,

Fig. 4

the parts of the closure according to Figures 2 and 3 in an exploded part view

Fig. 5

another embodiment of the closure in longitudinal section,

Fig. 6 a, b

another embodiment of the closure in a plan view, wherein the locked position of the closure is shown above the center line (FIG. 6 a) and the open position of the closure is shown with the opening button pressed (FIG. 6 b) below the center line,

Fig. 7

5 along the line AA in FIG. 6,

Fig. 8

the closure in the release position of the bolt in a representation corresponding to FIG. 10,

9 a, b

the closure in a plan view, above the center line the closure when accelerating against the tightening direction (Fig. 9 a) and below the center line the closure when accelerating in the tightening direction is shown (Fig. 9 b),

Fig. 10

9 shows a section along the line BB in FIG. 9.

On the basis of the schematic representation of the closure in FIGS. 1 a - d, the invention is first described in the basic interaction of the individual parts of the closure.

An insertion tongue 11 with a tongue opening 12 can be inserted into a closure housing 10, and it can be locked there via a bolt 13 pivotably mounted in housing 10 (FIG. 1 b, c), which for this purpose in turn is in an opening 14 in a base plate 15 of housing 10 intervenes. An ejector 16, which is loaded by an ejector spring 17, is displaceably arranged in the insertion path for the insertion tongue 11.

The latch 13 is pivotally mounted in the housing 10 with a tendency to open itself, and it is for example made of Figure 1 b visible securing position held and secured by a securing element 18 slidably arranged in the housing 10. A sliding button 19 acts with an extension 20 on the securing element 18 and moves this out of the securing position when the sliding button 19 is actuated, so that the latch 13 pivots up into its release position. The sliding key 19 is loaded in its starting position by a sliding key spring 21 which is supported on a projection 22 fixed to the housing in the exemplary embodiment shown. Alternatively, it can be provided that the sliding key spring 21 is supported directly on the securing element 18.

A compensating mass 23 is displaceably arranged in the housing 10 and is connected to the securing element 18 via two rigid connecting rods 24 arranged like scissors. The crossing point of the two scissor-like connecting rods 24 is designed as a fixed pivot point 25 of the linkage thus formed. The coupling of the connecting rods 24 to the securing element 18 on the one hand and the balancing mass 23 on the other hand takes place in each case via elongated holes 26 formed on the parts 18, 23, as a result of which the parts 18, 23 can move relative to one another. Alternatively, the connection between the connecting rods 24 either with the securing element 18 or with the compensating mass 23 or in each case with the two aforementioned parts can also be solid, that is to say without elongated holes, provided that the assigned parts of the connecting rods 24 are each resilient. In the exemplary embodiment shown, a spring 30, which spreads the two aforementioned parts and holds them at a mutual distance, is further arranged between the securing element 18 and the balancing mass 23.

The balancing mass 23 carries in the plane of the insertion path for the tongue 11 approach 27 which serves as an abutment for the ejector spring 17, so that the spring force emanating from the tensioned ejector spring 17 via the extension 27, the balancing mass 23, the connecting rods 24 the securing element 18 acts.

1 a shows the starting position of the closure when the tongue 11 is not inserted, in which the bolt 13 is pivoted up and rests on the ejector 16. The securing element 18 is in its release position.

The position of the parts of the closure with the inserted tongue is shown in relation to one another from FIG. Here, the latch 13 engages through the tongue opening 12 into the opening 14 of the base plate 15, so that the insertion tongue 11 is locked in the housing 10. In this position, the securing element 18 has moved into its front position and rests on the bolt 13 and prevents it from assuming its open position. Due to the inserted tongue 11, the ejector 16 is in its rear position and in this case has the ejector spring 17 tensioned, which loads the securing element 18 into the securing position shown and to that extent via the abutment in the form of the shoulder 27 of the balancing mass 23 and via the connecting rods 24 closing moment.

If, in this locked position of the closure, the closure is now accelerated in the direction of arrow 31, as is the case during a pretensioning process, then the steady-state forces indicated by arrows 32 act with respect the balancing mass 23, the securing element 18 and the sliding button 19 so that a self-opening of the closure is excluded because the securing element 18 is additionally loaded into its securing position by the persistence.

From Figure 1 c, the situation now arises that at the end of the tightening process, when the closure housing 10 is stopped, an acceleration in the direction of arrow 33 occurs, the inertia of the slide button 19 and the securing element 18, as illustrated by the arrows 34, leading to that the sliding button 19 is inserted into the closure housing 10 and thereby supports the still triggered opening movement of the securing element 18.

This opening movement is now counteracted by the movement of the balancing mass 23, which is also directed in the direction of the arrow 34 and which, with the same mass via the rigid connection in the form of scissor-like connecting rods 24, does not allow a relative movement of the securing element 18 to the balancing mass 23, so that the acceleration forces cancel each other out and a displacement of the securing element 18 cannot take place.

The mass of the slide button 19, on which a force in the direction of the arrow 34 also acts, is not included here; However, this force can only become effective after overcoming the slide key spring 21, and the remaining force component would have to be greater than the counterforce exerted by the balancing mass 23 on the securing element 18, which is also amplified by the spring force emanating from the tensioned ejector spring 17 if there should be a displacement of the securing element 18 under the action of the slide button 19. The opening movement of the sliding key can be excluded by appropriate design of the sliding key mass, the sliding key spring and the ejector spring.

FIG. 1 d finally shows the opening process of the closure by actuating the slide button 19, which thereby moves the securing element 18 away from its securing position, so that the latch 13 is released from the tongue recess 12 of the insertion tongue 11.

FIGS. 2 and 3 show an exemplary embodiment of the implementation of the invention in accordance with the schematic representation of FIGS. 1 a - d, the same parts being provided with the same reference numerals. From the figurative representation, it first emerges that the U-shaped closure housing 10 is closed on its upper side by a second plate 35. Furthermore, the connecting rods 24 are connected via intermediate spring struts 28 and associated film hinges 29 to the securing element 18 or the compensating mass 23, which are to be regarded as an alternative to the spring 30 in the exemplary embodiment according to FIGS. 1 a - d for a spreading effect. For the rest, the function described above arises accordingly with this closure.

From Figure 4 an embodiment of the invention can be seen, in which in a corresponding embodiment of the embodiment of Figures 2 and 3, the slide button 19 with slide key spring 21, securing element 18, connecting rods 24, balancing mass 23, ejector spring 17 and ejector 16 as a single one-piece component are formed, which is preferably made of plastic. With regard to the technology of production, there are no problems in combining rigid parts with resilient parts in the context of a one-piece component, so that the result from FIG. 4 shows that the closure advantageously consists of only a few individual parts and therefore also in is particularly easy to assemble.

The exemplary embodiments of the closure shown in FIGS. 5 to 10 correspond in their basic structure to the closure already described in FIGS. 1 to 4. In these exemplary embodiments, the securing element 40 for the pivotable bolt 13 is pivotably arranged in the closure housing 10 in such a way that it secures the bolt 13 with its end face. For this purpose, the securing element 40 lies above the bending radius 42 of the locking lug 41 formed on the locking bar 13 for its engagement in the tongue opening 12 of the insertion tongue 11, the locking bar 13 having elastically deformable locking surfaces 43 on both sides of its locking lug 41, on which the locking element 40 with its end face in the securing position rests; there is thus a distance 44 between the securing element 40 and the locking lug 41 in the locked position of the closure. This design serves to reduce the opening forces with regard to the movement of the securing element.

In the exemplary embodiment shown in FIGS. 5 to 10, the scissor-type linkage with its associated connecting rods is arranged on a bridge 45 which can be plugged onto the housing 10 which is U-shaped here and which has a bore or an elongated hole 46 for this purpose Includes a pivot pin 47 defining the pivot point of the linkage. The connecting rods 48 of the linkage which run between the pivot pins 47 and the balancing mass 23 are designed to be elastically resilient and are supported in associated pockets 49 of the balancing mass 23. On the connecting rods 50 running between the pivot pin 47 and the sliding key 19, springs 51 are formed for acting on the sliding key 19. In this exemplary embodiment, the linkage with the securing element 40 takes place via a pocket 52, which is attached to the securing element 40 and is guided by the connecting rods 50 and in which the upper edge 53 of the securing element 40 can move when it is pivoted.

When handling the closure, the insertion tongue 11 is inserted into the closure housing 10 and presses the ejector 16 against the force of the ejector spring 17 backwards against two downward ends 13 a of the bolt 13 and tilts it with the bolt nose 41 into the tongue opening 12 Insert tongue 11. This pivoting movement releases the pivotably mounted securing element 40. The connecting rods 48, which are tensioned in the open position of the closure by the compensating mass 23, press the securing element 40 onto the locking surfaces 43 of the bolt 13 due to the formation of scissors via the connecting rods 50 and the pocket 52 and fix it. When the connecting rods 48, 50 snap shut, the springs 51 formed on the ends of the connecting rods 50 move against the sliding button 19 and hold them in the forward position (FIGS. 6 a, 7).

In the locked position, the securing element 40 stands on the lateral locking surfaces 43 of the bolt 13. In the region of the bending radius 42 of the locking lug 41, however, there is a distance 44 between the bolt 13 and the locking element 40, the locking surfaces 43 deforming in such an elastic manner when subjected to a load that the load is transmitted to the securing element 40 via the bending radius 42. If the load ends, the locking surfaces 43 deform back into their starting position, so that the lock is easy to open.

To unlock the lock, the slide button 19 is pressed into the lock housing, and the springs 51 of the connecting rods 50 are first deformed until the slide button extension 20 abuts the securing element 40. During the further stroke, the securing element 40 is pivoted out of its locking position and, in the process, tensions the connecting rods 48 against the balancing mass 23 via the connection by means of the pocket 52 and the connecting rods 50. The balancing mass moves in the embodiment with an elongated hole against an assigned stop; As a result, the opening forces are lower than in the version without an elongated hole. If the securing element 40 pivots over the edge of the locking surfaces 43, the bolt 13 and thus the insertion tongue 11 are released.

In the embodiment of the shock protection shown in Figure 5, the pivot 47 is fixed in the bridge 45, and the balancing mass 23 can shift in an associated recess 59 of the housing from the front position shown in Figure 5 to a rear position, the scissors-like Linkage with the connecting rods 48, 50 pulled, that is closed. In the exemplary embodiment described in FIGS. 6 to 10, on the other hand, the compensating mass 23, starting from the starting position shown in FIG. 7, is both in a front position in the opening 60 and slidable to a rear position in the opening 61. The description of the function of the shock protection is based on the illustration of the exemplary embodiment in FIGS. 6 to 10, reference being made to the difference to the function of the exemplary embodiment according to FIG. 5.

When tightening the closure, the closure is accelerated in the direction of arrow 31 (FIG. 9b). At this acceleration, the slide button 19 remains stationary due to its inertia and cannot move due to its arrangement. The securing element 40 has its center of gravity 54 below its fulcrum 55 (FIG. 10), so that there is an opening effect for the bolt 13 when accelerated in the direction of the arrow 31. In the embodiment of Figure 5, the balancing mass 23 is fixed in its front position and remains in this position due to its persistence and thus counteracts the opening moment of the securing element 40 via the support by the connecting rods 48, 50. With sufficient spring tension of the connecting rods 48, the balancing mass 23 thus holds the securing element 40 in its locked position. In the exemplary embodiment shown in FIGS. 6 to 10, the compensating mass 23 moves in the direction of the arrow 34 into the front opening 60, the pivot 47 in the slot 46 of the bridge 45 simultaneously moving from the rear position 56 to the front position 57 (Fig. 10). The elastic connecting rods 50 tighten and the shock protection unit counteracts the opening moment of the securing element 40.

Following the tightening process, the closure is accelerated in the direction of arrow 34 and moves in the process the opening button 19 due to its inertia in the opening direction. Here, it is first braked by the springs 51 before its extension 20 abuts the securing element 40. At the same time, the pivot pin 47 of the connecting rods 48, 50 has moved back into its rear position 56 in the elongated hole 46, and the balancing mass 23, which has the same size as the sliding key 19 with a proportionate mass of the securing element 40, moves into the rear closed position 58 and pulls the scissors-like linkage with the connecting rods 48, 50. Together with the moment of the securing element 40 closing in this acceleration direction (arrow 34), the sliding button 19 is prevented from moving further in the opening direction, so that the closure remains locked.

Claims (19)

1. Safety belt buckle for receiving and locking an insertion tongue (11), having a housing and an insertion path for the insertion tongue (11), which insertion path is arranged in the said housing and contains a spring-loaded ejector (16), having a latch (13) mounted in the safety belt buckle and cooperating with the tongue recess in the event of locking, which latch holds the insertion tongue (11) in an assigned recess of the safety belt buckle, and having a spring-loaded slide key (19) which is guided transversely relative to the plane of movement of the latch for releasing the locking mechanism, wherein a securing element (18) which fixes and secures the latch (13) in the locking position of the safety belt buckle, is displaceably arranged in the housing so that, for unlocking the safety belt buckle, it can be moved into a release position for the latch by the slide key, and a compensation mass member (23) displaceably arranged in the safety belt buckle housing is provided for the compensation of acceleration forces acting on the safety belt buckle, characterised in that the compensation mass member (23) is connected to the securing element (18, 40) by way of a connecting rod arrangement (24, 48, 50) with a scissor-type movement, the connecting rod arrangement having two connecting rods (24, 48, 50) guided by way of a pivot (25, 47) arranged on the housing (10, 45), for the compensation mass member (23) and the securing element (18, 40), the compensation mass member (23) and the securing element (18, 40) being connected in such a way that the connecting rod arrangement (24, 48, 50) brings about, as a forced guidance, a movement of the compensation mass member (23) and the securing element (18, 40) in opposite directions relative to one another.
2. Safety belt buckle according to claim 1, characterised in that the connecting rods (24), which are constructed inflexibly, are guided by way of the pivot (25), which is formed fixed to the housing, and are connected to the securing element (18) and the compensation mass member (23) in assigned slotted holes (26).
3. Safety belt buckle according to claim 1, characterised in that the connecting rods (24, 48, 50) of the scissor-type connecting rod arrangement have elastic properties.
4. Safety belt buckle according to one of claims 1 to 3, characterised in that the compensation mass member (23) is formed as an abutment for the ejector spring (17).
5. Safety belt buckle according to claim 4, characterised in that the compensation mass member (23) has a projection (27) extending into the plane of the insertion path for the insertion tongue (11).
6. Safety belt buckle according to one of claims 1 to 5, characterised in that, between the securing element (18) and the compensation mass member (23), there is arranged a spring (30) which braces the parts against one another and forces them apart.
7. Safety belt buckle according to one of claims 1 to 6, characterised in that the mass of the securing element (18) and the mass of the compensation mass member (23) are of the same magnitude.
8. Safety belt buckle according to one of claims 1 to 7, characterised in that the slide key spring (21) is directly supported on the securing element (18).
9. Safety belt buckle according to one of claims 1 to 7, characterised in that a projection (22) fixed to the housing is provided for supporting the slide key spring (21).
10. Safety belt buckle according to one of claims 1 to 8, characterised in that the slide key (19), the slide key spring (21), the securing element (18), the connecting rods (24), the compensation mass member (23), the ejector spring (17) and the ejector (16) are formed as one single component.
11. Safety belt buckle according to claim 10, characterised in that the connection between the compensation mass member (23) and the connecting rods (24), on the one hand, and the connecting rods (24) and the securing element (18), on the other hand, is realised by way of small spring legs (28) which are connected by means of thin connecting straps (29) and which press the compensation mass member (23) and the securing element (18) away from one another and force them apart.
12. Safety belt buckle according to claim 1, characterised in that, between the compensation mass member (23), on the one hand, and the slide key (19) and the securing element (40), on the other hand, the scissor-type connecting rod arrangement (48, 50) acts so that the compensation mass member (23), depending on the direction of the acceleration force (arrows 31, 34), holds the slide key (19) and the securing element (40) in position.
13. Safety belt buckle according to claim 12, characterised in that the securing element (40), which is arranged for pivoting in the safety belt buckle housing (10), is connected in a form-locking manner to connecting rods (50) running between the pivot (47) and the slide key (19), by way of a pocket (49) which cooperates with the connecting rods (50).
14. Safety belt buckle according to claim 13, characterised in that springs (51) which are responsible for supporting the slide key (19) are arranged on the connecting rods (50) running between the pivot (47) and the slide key (19).
15. Safety belt buckle according to one of claims 12 to 14, characterised in that a cross-piece (45) which can be placed on the U-shaped housing (10), is provided for receiving the trunnion (47) of the connecting rod arrangement (48, 50), and in that the cross-piece (45), the connecting rod arrangement with the connecting rods (48, 50), the trunnion (47) and the compensation mass member (23) form one component.
16. Safety belt buckle according to one of claims 11 to 14, characterised in that the mass of the compensation mass member (23), on the one hand, and the mass of the slide key (19) together with the proportionate mass of the securing element (40), on the other hand, are of the same magnitude.
17. Safety belt buckle according to one of claims 11 to 16, characterised in that the connecting rods (48) of the scissor-type connecting rod arrangement, which connecting rods are arranged between the pivot (47) and the compensation mass member (23), have elastic properties, in that the trunnion (47) of the connecting rod arrangement, which trunnion forms the pivot, is slidable in the longitudinal direction in an assigned slotted hole in the housing, and in that the compensation mass member (23) is arranged in the housing (openings 60, 61) for sliding in both directions of acceleration (arrows 31, 34).
18. Safety belt buckle according to one of claims 12 to 17, characterised in that the securing element (40) rests on elastically deformable locking surfaces (43) arranged on the latch (13) on both sides of the catch (41) thereof so that, in the release position, there is a space (44) between the securing element (40) and the catch (41).
19. Safety belt buckle according to claim 18, characterised in that the securing element (40) rests on the latch (13) above the bending radius (42) of the catch (41) of the latch (13).

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