EP0190976A1 - Vehicle door closer - Google Patents

Abstract

Mechanism for assisting in the closing of a door (1) of a motor vehicle comprising: - a lever (8) mounted tilting about a fixed axis (9) at one of its ends, - a fork ( 11) rotatably mounted around an axis (12) integral with the lever (8) and arranged to receive a rod (3) fixed to a center leg of the vehicle body, this fork (11) being provided with a member elastic (13) returning it to its release position of the keeper (3), - a means (14) for locking the fork (11) on the keeper (3) during the tilting of the lever (8), the locking s '' before tilting the lever, - and a cam (17) rotating around a fixed axis (18), capable of being rotated by a motor (10) automatically triggered by the locking of the fork (11) at start of the door closing stroke (1).

Description

The present invention relates to a mechanism for assisting in the closing of a door of a motor vehicle, adapted to be placed in this door.

For some time now, there has been a desire on the part of some drivers of motor vehicles to see the doors of vehicles fitted with assistance mechanisms for closing them, in the final phase of closing. Such a mechanism has the advantage of avoiding the user having to "slam" his door to close it properly.

The object of the invention is therefore to propose such a mechanism, the structure of which is not too complicated, of a relatively moderate cost and which, moreover, presents the security necessary in the event that a foreign body is introduced between the door and the frame, prevents complete closing of the door.

• - un levier monté basculant autour d'un axe fixe à l'une de ses extrémités,
• - une fourchette montée rotativement autour d'un axe solidaire de l'extrémité opposée du levier et agencée pour pouvoir recevoir une gâche fixée à un pied-milieu faisant partie de la carrosserie du véhicule, cette fourchette étant munie d'un organe élastique la rappelant dans sa position de dégagement de la gâche,
• - un moyen de verrouillage de la fourchette sur la gâche durant le basculement du levier le verrouillage s'effectuant avant basculement du levier;
• - et une came montée rotative autour d'un axe fixe parallèle aux axes de basculement du levier et de la fourchette, susceptible d'être entrainée en rotation par un moteur automatiquement déclenché par 1 le verrouillage précité de la fourchette au début de la course de fermeture de la porte, cette came étant profilée pour pouvoir coopérer avec le levier afin de la faire basculer contre la sollicitation antagoniste d'un organe élastique de rappel tendant à maintenir le levier en appui sur la came.

According to the invention, the mechanism for assisting in the closing of a door comprises

• - a lever mounted tilting around a fixed axis at one of its ends,
• - a fork rotatably mounted around an axis integral with the opposite end of the lever and arranged to be able to receive a keeper fixed to a middle foot forming part of the vehicle body, this fork being provided with an elastic member recalling it in its striker release position,
• a means for locking the fork on the keeper during the tilting of the lever, the locking being effected before the lever is tilted;
• - and a cam rotatably mounted around a fixed axis parallel to the pivot axes of the lever and of the fork, capable of being driven in rotation by a motor automatically triggered by 1 the aforementioned locking of the fork at the start of the door closing stroke, this cam being profiled so as to be able to cooperate with the lever in order to make it rock against the opposing stress of an elastic return member tending to keep the lever in contact with the cam.

It is therefore understandable that this mechanism comes into action from the moment when the fork, which includes an appropriate hook, engages against the fixed keeper of the middle leg, which triggers the locking of this fork and thereby the setting the cam drive motor, the rotation of which causes the lever to tilt. The latter being engaged with the keeper fixed by the fork, therefore causes the rotation of the door which ends its closing movement, until it has tilted by a predetermined angle corresponding to the complete closing of the door with overtravel to be sure that the lock is correctly locked.

According to a feature of the invention, the means for locking the fork on the keeper is a pawl articulated on an axis parallel to the axis of rotation of the fork and close to it, and this pawl is equipped with a spring which urges it into one or the other of two stable positions, in one of which the fork is unlocked relative to the pawl.

The first of these two stable positions is occupied by the pawl when the door is open, while the second is taken by the pawl at the end of the door closing movement.

When you want to open the door, the strike remains engaged in the fork while the latter and its support lever tilt until it comes into contact again with the cam. At this time, the fork pivots under the action of its elastic return member, and releases the keeper so that the door can be opened normally.

• - la Figure 1 est une vue schématique en perspective d'une porte de véhicule automobile susceptible d'être équipée d'un mécanisme d'assistance à la fermeture selon l'invention, et de la partie correspondante de la carrosserie du véhicule, la porte étant ouverte;
• - la Figure 2 est une vue mi-coupe, mi- élévation dans un plan vertical médian d'une forme de réalisation du mécanisme d'assistance selon l'invention, deux positions différentes possibles de ce mécanisme étant représentées . l'une en traits continus et l'autre en traits interrompus;
• - la Figure 3 est une vue de dessus partielle du mécanisme de la Figure 2;
• - la Figure 4 est une vue analogue à la Figure 2 montrant deux autres positions possibles des différentes pièces du mécanisme durant un cycle de fermeture de la porte équipée d'un tel mécanisme;
• - la Figure 5 est une vue en élévation latérale du mécanisme, prise suivant la flèche K de la Figure 2, la came n'étant pas représentée;
• - la Figure 6 est une vue en élévation extérieure de l'ensemble du mécanisme des Figures 2 à 5, la Figure 7 est une vue en élévation de côté suivant la flèche L de la Figure 6 de ce même mécanisme, tandis que la Figure 8 est une vue en élévation arrière du mécanisme des Figures 6 et 7, prise du côté intérieur de la porte;
• - la Figure 9 est un diagramme illustrant les efforts développés par le mécanisme durant un cycle de fermeture de la porte, les efforts étant représentés en ordonnées et la longueur de la course en abscisses.

Other particularities and advantages of the invention will appear during the description which follows, given with reference to the appended drawings which illustrate an embodiment thereof by way of nonlimiting example:

• - Figure 1 is a schematic perspective view of a motor vehicle door capable of being fitted with a closing assistance mechanism according to the invention, and of the corresponding part of the vehicle body, the door being open;
• - Figure 2 is a mid-sectional view, mid-elevation in a median vertical plane of an embodiment of the assistance mechanism according to the invention, two different possible positions of this mechanism being shown. one in solid lines and the other in broken lines;
• - Figure 3 is a partial top view of the mechanism of Figure 2;
• - Figure 4 is a view similar to Figure 2 showing two other possible positions of the different parts of the mechanism during a closing cycle of the door equipped with such a mechanism;
• - Figure 5 is a side elevational view of the mechanism, taken along arrow K of Figure 2, the cam not being shown;
• FIG. 6 is an external elevation view of the entire mechanism of FIGS. 2 to 5, Figure 7 is a side elevational view along arrow L of Figure 6 of the same mechanism, while Figure 8 is a rear elevational view of the mechanism of Figures 6 and 7, taken from the inside of the door;
• - Figure 9 is a diagram illustrating the forces developed by the mechanism during a door closing cycle, the forces being represented on the ordinate and the length of the stroke on the abscissa.

• a) Assister la fermeture d'ouvrants de véhicules (sur 40 mm) par un système électromécanique le plus petit et le plus simple possible, monté en plus d'une serrure classique et sans aucune liaison avec celle-ci; Î
• b) Ne pas entraver le fonctionnement de la porte en cas d'usage classique (claquement) ou panne de mécanisme;
• c) Assurer par lui-même mécaniquement la sécurité nécessaire. Ce dernier point peut être ainsi explicité :
  • - il faut un effort important pour comprimer le joint de porte;
  • - pour que le mécanisme soit sans danger, il ne faut pas qu'un corps étranger se trouvant dans la feuillure de porte ou introduit en cours de fermeture soit soumis à un effort trop important;
  • - or, l'effort important n'est nécessaire que dans les derniers millimètres de la course alors qu'il n'est plus possible que subsiste ou s'introduise un corps étranger dans la feuillure;
  • - d'où le diagramme effort-course recherché, illustré à la Figure 9. ;

The objectives of the invention, achieved by the implementation of the assistance mechanism which will be described below, are the following:

• a) Assist the closing of vehicle openings (over 40 mm) by the smallest and simplest electromechanical system possible, mounted in addition to a conventional lock and without any connection to it; Î
• b) Do not interfere with the operation of the door in the event of conventional use (slamming) or breakdown of the mechanism;
• c) Ensure by itself mechanically the necessary security. This last point can be explained as follows:
  • - significant effort is required to compress the door seal;
  • - for the mechanism to be harmless, a foreign body in the door rebate or introduced during closing must not be subjected to excessive force;
  • - Now, the significant effort is only necessary in the last millimeters of the race when it is no longer possible for a foreign body to remain or be introduced into the rebate;
  • - hence the effort-race diagram sought, illustrated in Figure 9.;

We see in Figure 1, a front door 1 of a motor vehicle in the open position, and a middle leg 2 of the vehicle body, corresponding to this door. The foot 2 is equipped with a fixed keeper 3, which projects towards the front of the vehicle so as to be able to be inserted into a corresponding slot 4 formed at the top of a mechanism 5 for assisting in the closing of the door 1, housed in the edge thereof situated opposite the keeper 3 when the door 1 is closed.

The middle foot 2 contains, below the keeper 3, a stop 6 elastically urged by a spring 7 in a position where its head projects forward relative to the foot 2, this head being suitably rounded so as to delimit a curvilinear surface which allows, by a lateral thrust exerted on this projecting head, to retract it inside the foot 2 against the return force of the spring 7. The role of the retractable stop 6 will be explained below after.

The mechanism 5 will now be described with reference to Figures 2 to 8.

• - un levier 8 monté basculant autour d'un axe fixe 9 traversant l'une de ses extrémités, son extrémité inférieure dans l'exemple décrit;
• - une fourchette 11 montée rotativement autour d'un axe 12 solidaire de l'extrémité opposée du levier 8, donc l'extrémité supérieure dans cet exemple, et qui est agencée pour pouvoir recevoir la gâche 3, cette fourchette 11 étant munie d'un organe élastique constitué d'un ressort 13 qui la rappelle constamment dans sa position de dégagement de la gâche 3;
• - un moyen de verrouillage de la fourchette 11 sur la gâche 3 durant le basculement du levier 8 au début de la course de fermeture de la porte 1, ce moyen étant dans l'exemple décrit un cliquet 14 articulé sur un axe 15 parallèle à l'axe 12 et à l'axe 9, et voisih: de l'axe 12 de rotation de la fourchette. Le cliquet 14 est équipé d'un ressort 16 qui le sollicite dans l'une ou l'autre de deux positions stables dans l'une desquelles la fourchette 11 est déverrouillée par rapport au cliquet 14, tandis qu'elle est verrouillée ou en attente de verrouillage dans la seconde position stable.
• - et une came 17 montée rotative autour d'un axe fixe 18 parallèle aux axes 9, 12 et 15, et susceptible d'être entrainée en rotation par un moteur électrique 10, (visible aux Figures 6 à 8), dans le sens anti-horaire symbolisé par la flèche R aux Figures 2 et 4.

This mechanism includes:

• - A lever 8 mounted tilting about a fixed axis 9 passing through one of its ends, its lower end in the example described;
• - A fork 11 rotatably mounted around an axis 12 integral with the opposite end of the lever 8, therefore the upper end in this example, and which is arranged to be able to receive the keeper 3, this fork 11 being provided with a elastic member constituted by a spring 13 which recalls it cons particularly in its release position from the striker 3;
• a means for locking the fork 11 on the keeper 3 during the tilting of the lever 8 at the start of the closing stroke of the door 1, this means being in the example described a pawl 14 articulated on an axis 15 parallel to the axis 12 and axis 9, and neighboring: axis 12 of rotation of the fork. The pawl 14 is equipped with a spring 16 which biases it in one or the other of two stable positions in one of which the fork 11 is unlocked relative to the pawl 14, while it is locked or waiting locking in the second stable position.
• - And a cam 17 rotatably mounted around a fixed axis 18 parallel to the axes 9, 12 and 15, and capable of being rotated by an electric motor 10, (visible in Figures 6 to 8), in the anti direction - schedule symbolized by the arrow R in Figures 2 and 4.

The fork 11 delimits a hook with two branches 11a, 11b separated by an opening 19 which can receive the keeper 3. The branch 11b is provided with a transverse tab 11c adapted to slide on a guide ramp 21 formed on the upper edge of one 22 of two vertical flanges 22, 23, mutually parallel and between which are arranged the lever 8, the cam 17, the fork 11 and the pawl 14. The two flanges 22, 23 support the axes of rotation 9 of the lever 8 and 18 of the cam 17. The axes 12 and 15 are supported, at their ends, by two parallel plates 8a, 8b pivotally mounted around the axis 9 and connected by transverse pieces of which only one 24 is visible to the drawings.

The curve of the guide ramp 21 has a convex curvilinear outline, and is determined so as to allow the release of the keeper 3 in the event of a breakdown during operation, whatever the position of the lever 8 while limiting the tilting of the fork 11 to avoid the risk of interference with the cam 17. This curve is substantially an arc, the center of which is outside the mechanism. The lever 8 is equipped with a rolling roller 25 carried by a pin 26 disposed between axes 9 and 15, and supported at its ends by the plates 8a, 8b. An elastic member constituted by a helical spring 27 coaxial with the axis 9, and one end 27a of which is anchored in the bottom 28 connecting the flanges 22, 23 while its other end 27b is anchored in the plate 8a, constantly requests the lever 8 rotating in the direction which keeps its roller 25 in abutment against the profile of the cam 17 (position shown in solid lines in Figure 2).

The profile of the cam 17, produced in such a way that it provides work by constant degree, comprises four consecutive portions extending as follows in the direction opposite to its direction of rotation R (FIG. 2): a first portion AB, extending over 90 ^* , the radius of which increases regularly from A to 8, a second portion BC, which extends over an angular sector of between 90 ° and 245 ° approximately, the radius of curvature of which increases only slightly from B at C, a portion CD between 245 ° and 320 °, and a terminal area DA from 320 ° to 360 °. Point C corresponds to the normal closing position of the door, while point D corresponds to an additional stroke or "overtravel" beyond the closing point C. The first three angular sectors are working zones: fast forward, low effort (AB), gradual increase in effort (BC), maximum effort (CD), the fourth sector DA forming the fall.

The cam 17 is pierced with a housing 29 adapted to receive the head of the retractable stop 6 when the cam 17 is in the angular position where its housing 29 is located opposite the stop 6. The projecting part of the latter is rounded as already indicated, to allow either its withdrawal inside the center leg 2 when the cam comes to be placed in front of the foot 2, or its insertion in the housing 29 when the cam 17 is in the appropriate angular position relative to at stop 6.

The fork 11 is provided with a notch 20 for locking by a corresponding spout 14a of the pawl 14.

The return spring 13 of the fork 11 is anchored by one of its ends in the upper part of the plate 8a, and by its other end in the fork 11, as can be clearly seen in Figure 5. On its side , the return spring 16 of the pawl 14 is anchored by one of its ends in the latter, and by its other end in the plate 8b.

The mechanism is also equipped, according to a feature of the invention, with a stop 31 fixed, in this example, to the flange 22, formed of an elastic tongue provided with an end tab 32 which projects internally between the flanges 22 and 23 (Figures 2 and 3) at their upper parts and substantially opposite the location of the pawl 14 at the end of closing of the door 1. The end tab 32 is adapted to elastically disappear under the pressure of a tongue transverse 33 of the pawl 14 during the tilting of the latter during the stroke. closing of the door 1 (position in phantom in Figure 3), then to form a non-return stop for the pawl 14 when the tongue 33 has exceeded said projecting part 32. (Position 33a in Figure 3).

On the outside of door 1, the mechanism 5 is closed by a transverse wall 34, and on the inside of the door by a transverse wall 35, these two walls 34, 35 connecting the flanges 22, 23 to form, with the bottom 28, a case open at its upper end (Figure 6). The connection of the flange 22 with the housing is ensured by crimps S ₁ , S ₂ , S ₃ (Figure 8), three holes 30 being provided for attachment to the door 1. The outer flange 23 is pierced with a light 20 by which we see the cam 17 and its housing 29 (Figure 6), and the motor 10 for driving the cam 17 is fixed to the rear flange 22 by bolts and nuts 36 (Figures 7 and 8).

The entire assistance mechanism 5 is dimensioned so that it can be housed in the door 1 by being flush with the outer edge of the latter by the flange 23, the light 20 of the latter being open towards the interior of the vehicle so that the head of the retractable stop 6 can engage therein as well as in the housing 29.

The operating cycle of the mechanism which has just been described is as follows.

The door 1 of the vehicle being assumed to be completely open, the user pulls the door to close it (arrow F in Figure 1). At about 40 mm from full closure, the mechanism 5 takes over the door 1 and completes the closure as follows.

This mechanism is, at the start of its operating cycle, in the position illustrated in lines continuous in Figure 2 and referenced 5.1: the roller 25 is kept applied against the profile of the cam 17 substantially at point A, by the return spring 27 of the lever 8, the cam 17 not being actuated by the gearmotor 10; the fork 11 is in the release position of the keeper 3, its hook 11a being in the low position, while its branch 11b comes into contact with the keeper 3, the transverse tab 11c being in abutment on the start of the guide ramp 21, the spring 13 holding the fork 11 in this position. The pawl 14 has its spout 14a unlocked relative to the corresponding notch 20 of the fork 11, and is held in this first stable position by its return spring 16.

The keeper 3 is supported on the rear finger of the fork 11 constituted by its branch 11b, and causes it to tilt, as well as the assembly of the fork 11, in its position referenced 11.2 in FIG. 4, while the lever 8 is retained in its initial angular position by its return spring 27. As a result, the locking notch 20, arranged on the fork 11 on the other side of its axis 12 relative to the finger 11b, lowers, passes over- below the spout 14a of the pawl 14, so that this spout is applied to the notch 20 and locks the fork in its position 11.2, that of the pawl 14 being referenced 14.2 (Figure 4). The spring 16 maintains the pawl 14 in this locking position of the fork 11.2.

This locking of the fork 11.2 by the pawl 14.2 controls the tensioning of the gearmotor 10, which rotates the cam 17, which begins to rotate anti-clockwise R. Therefore, the sector AB of the profile of the cam 17 causes the lever 8 to tilt to the right (Figure 2) via the roller 25, so that this tilting, which continues while the profile of the cam 17 pushes the roller 25 until the arrival of the point D in contact with it, pulls door 1 to a position located slightly beyond its fully closed position, therefore performing an "overtravel". The position of the lever 8, the fork 11 and the pawl 14 at the end of this "overtravel" is illustrated in phantom in Figure 2 and referenced 5.3 (for all moving parts), 11.3, 8.3 and 14.3, the keeper 3 being for convenience also shown in this position, engaged inside the opening 19 of the fork 11.3. The normal closing of the door 1 corresponds to the passage of point C of the cam 17 on the roller 25, while the "overtravel" beyond this normal closing corresponds to the movement of the sector CD on the roller 25.

When point C arrives on the roller 25, the transverse tab 33 of the pawl 14 is in its position referenced 33b in FIG. 3, in which it slides on the projecting part 32 of the eclipsable stop 31, which it pushes elastically towards outside. The tongue 33 continuing to slide on the tab 32 during the scrolling of the sector CD on the roller 25, exceeds the end of the tab 32 behind which it therefore comes to be placed in position 33a (Figure 3), while the tab 32 returns elastically in its position shown in solid lines in Figure 3, where it forms a stop opposing the backward movement of the tongue 33a and the pawl 14.3, the spout 14a of which is always applied to the notch 20 of the fork 11 thus maintained locked.

The cam 17 continues to rotate until it returns to its position illustrated in solid lines in FIG. 2, in which the housing 29 is placed opposite the stop 6, which is inserted therein automatically under the action of its spring. 7, the cam 17 then being locked in this angular position.

During this last part of the stroke of the cam 17, the lever 8 is biased in the opposite direction by its spring 27, and returns from the value of the "overtravel", plus the clearance between the keeper 3 and its housing 19 in the fork 11 to occupy its final position 8.4 illustrated in Figure 4, as well as the fork 11.4 and the pawl 14.4. (The position of all the moving parts is referenced 5.4). This backward movement of the lever 8 causes the fork 11 to be unlocked by the pawl 14, the spout 14a of which is in abutment against the tab 32 of the retractable abutment 31. The backward movement of the lever 8 therefore forces the pawl 14 to tilt down around its axis 15, which releases the beak 14a of the notch 20 of the fork 11, as visible in Figure 4. Of course during this time, the keeper 3 remains in the fork 11, and prevents the lever 8 to return to its initial position under the action of its return spring 27. The whole mechanism is then in its final position corresponding to the normal closing of the door 1, the geared motor 10 powered by a time delay, being stopped after sufficient time to close the door.

If the user now wants to open the door 1, the keeper 3 is moved by the pivoting of the door in the direction symbolized by the arrow G at the Figure 4. The fork 11 and the lever B accompany this angular movement of the keeper 3 towards the cam 17, until the roller 25 comes back into contact with the latter. The fork 11 can then tilt around its axis 12 under the action of its spring 13 to return to its position shown in solid lines in Figure 2, in which the keeper 3 is released from the fork. Correlatively, the pawl switches from its position 14.4 to its initial position 14, in which it does not lock the fork 11. The door 1 moves away from the keeper 3, and the mechanism 5 is ready for a new closure following the cycle previously described.

In the event of failure of the motor 10 during a cycle, it suffices to manually end the closing with overtravel to unlock the pawl 14 and use the door in the conventional manner.

FIG. 9 shows a diagram showing a numerical example of the forces developed (Newton on the ordinate) as a function of the length of the travel of the door (in mm on the abscissa), this diagram corresponding to the numerical values mentioned previously for the profile of cam 17. However, the three rectilinear segments AB, BC, CD shown in Figure 9 correspond to the maximum force values provided for the mechanism: this means that if the closing of the door encounters unexpected resistance, exceeding the value maximum provided according to successive sections AB ...., the closure stops automatically for safety. Below this maximum curve AD, a real curve A'B'C'D 'of a closing cycle has been shown, the line in dotted lines corresponding to the average forces developed from one end to the other of this real curve. In case of unexpected resistance during the first part A'-B 'of the closing stroke, causing a peak P' which exceeds the maximum expected value of 60 N (for example if a person has left his finger between the door and the middle foot 2), the mechanism stops automatically. This is made possible by the fact that in this first part of the cycle, the maximum force developed is low, that is to say in the example described, less than 6 daN, which avoids providing the door with an additional security system.

Beyond point B, i.e. from 30 mm of travel, the closing force increases rapidly (section BC) to a significant value (75 daN) of a CD bearing which corresponds to the "overtravel". But during this BD limit switch, it is no longer possible to introduce a foreign body between door 1 and the center leg 2, or between the body and the opposite edge of the door, which eliminates any risk of accident. .

The profile of the cam 17 is determined so that it provides work by degree of rotation which is constant during the cycle, and therefore allows the use of a motor 10 of minimum power.

A numerical example will be given below of determining the profile of the cam 17 so that it provides constant work per degree of rotation.

lère phase :

2e phase :

3e phase :

The cam 17 must reproduce the force-stroke diagram of Figure 9, for a rotation of 300 °. The work to be provided is represented by the area located between the axis X of the abscissas, and the maximum curve ABCD. Profile determination calculations of the cam 17 corresponding to this example are provided below, the successive angles θ 1, θ 2 'and θ ₃ corresponding to the successive angular sectors AB, BC, CD.

1st phase:

2nd phase:

3rd phase:

The invention is not limited to the embodiment described and may include variant embodiments. Thus it is obvious that the above cam profile has been given only as an indicative example, and can be modified according to the mechanical characteristics desired for the mechanism. Similarly, the pawl 14, the lever 8 and the fork 11 can be produced in a different way from that described, insofar as equivalent results are obtained.

Claims (6)

1 - Assistance mechanism for closing a door (1) of a motor vehicle, adapted to be placed in this door, characterized in that it comprises: - a lever (8) mounted tilting about a fixed axis (9) at one of its ends, - a fork (11) rotatably mounted around an axis (12) integral with the opposite end of the lever (8) and arranged to be able to receive a keeper (3) fixed to a center leg (2) forming part of the vehicle body, this fork (11) being provided with an elastic member (13) recalling it in its release position from the keeper (3), a means (14) for locking the fork (11) on the keeper (3) during the tilting of the lever (8) the locking being effected before the tilting of the lever, - And a cam (17) rotatably mounted around a fixed axis (18) parallel to the axes (9, 12) for tilting the lever (8) and the fork (11), capable of being driven in rotation by a engine (10) automatically triggered by the aforementioned locking of the fork (11) at the start of the door closing stroke (1), this cam (17) being profiled so as to be able to cooperate with the lever (8) in order to cause it to tilt against the opposing stress of an elastic return member (27) tending to keep the lever (8) in abutment on the cam (17). 2 - Mechanism according to claim 1, characterized in that the fork (11) articulated on the lever (8) comprises a finger (11b) provided with a transverse lug (11c) adapted to slide on a ramp (21) guide formed on the upper edge of one (22) of two parallel vertical flanges (22, 23) between which are arranged the lever (8), the cam (17), the fork (11), and which support the axes (9, 18) of rotation of the lever (8) and of the cam (17), the guide ramp (21) being curvilinear and extending over an arc of a circle corresponding to the closing stroke of the lever (8). 3 - Mechanism according to one of claims 1 and 2, characterized in that the means for locking the fork (11) on the keeper (3) is a pawl (14) articulated on an axis (15) parallel to the axis of rotation (12) of the fork (11) and close to it, and this pawl (14) is equipped with a spring (16) which biases it in one or the other of two stable positions, in which the fork (11) is unlocked relative to the pawl (14). 4 - Mechanism according to one of claims 1 to 3, characterized in that the cam (17) cooperates with a roller (25) integral with the lever (8) and applied to a profile of the cam (17) made of so that its drive motor (10) develops a constant work per degree of rotation, for example a low effort of 0 to 90 ° of rotation during most of the closing stroke, a significant effort of 90 ^* to 250 ° to develop the effort to close the door (1) until a terminal "overtravel" (CD) beyond the effective closing point (C). this rotation being followed by a backward movement of the lever (8) by a few degrees from its "overtravel" to its final position given by the relaying of the door by the lock, while the terminal part ( DA) of the profile of the cam (17) is such that this profile deviates from the roller (25). 5 - Mechanism according to one of claims 1 to 4, characterized in that the cam (17) is pierced with a .logement (29) adapted to receive a retractable stop (6) mounted in the corresponding center leg (2) to the door (1), resiliently returned to the projecting position relative to the foot (2) and profiled to first retract into the foot at the start of the door closing, under the push of the cam (7), then to come and reside elastically in the housing (29) of the cam (17) when the latter reaches its angular position corresponding to the closing of the door (1). 6 - Mechanism according to one of claims 4 and 5, characterized in that it comprises a stop (31) fixed to one (22) of the flanges, projecting internally between them at their upper part substantially opposite of the location of the pawl (14) at the end of the closing of the door, and adapted to elastically disappear under the push of a transverse tongue (33) of the pawl (14) during the tilting of the latter, then for forming a non-return stop for the pawl (14) when the tongue (33) has exceeded said stop (31), this non-return stop causing the pawl (14) to tilt when the lever (8) moves back from from its "overtravel" position (D), so that the pawl (14) then escapes from the stop (31), unlocks the fork (11), and comes under the effect of its return spring (16 ) in its second stable position.

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