FR2650234A1 - SEAT BELT SYSTEM HAVING A VEHICLE MOTION SENSOR WITH VARIABLE POSITION ON THE REEL DRUM - Google Patents

Abstract

Seat belt system provided with a self-locking retractor drum 12 integrated into the backrest 10 of the seat of a vehicle, which drum 12 has at least one control device sensitive to the movements of the vehicle for causing the locking of the retractor / unwinder shaft of the belt during accelerations or decelerations influencing the reel drum 12, the control device sensitive to vehicle movements being rotatably mounted on the reel drum 12 and being able to adapt its position to the inclination of the backrest 10.

Description

SEAT BELT SYSTEM WITH A SENSOR

  VEHICLE MOVEMENTS WITH VARIABLE POSITION ON THE

REEL DRUM

  The present invention relates to a system for

  seat belt with self-winding reel drum

  as integrated into the backrest of the vehicle seat, which

  drum has at least one sensitive control device

  susceptible to vehicle movements to cause blockage

  age of the unwinder / rewinder shaft in the case of acceleration

  tion or slowdown acting on the reel drum

  their, the control device sensitive to the movements of the vehicle being mounted in rotation with respect to the take-up drum and being able to adapt its position to. the inclination

of the seat back.

  A safety system of this type has already been described in DE-PS 26 58 747. In such a seat belt system

  security, it is a question of keeping watch, thanks to a drum

  roller integrated in the backrest, to compensate for a displacement of the backrest in various degrees of inclination relative to the roller drum sensor sensitive to the movements of the vehicle with the aim of keeping the sensor in the direction of the acceleration on land, so as to ensure efficiency even when the file assumes

various inclinations.

  In an exemplary embodiment, the belt system

  This type of safety device plans to arrange the rotary sensor on the take-up drum, the sensor being mounted on a part capable of rotating around the axis.

  of the belt unwinder / rewinder shaft, this part which

  passes outside the reel drum by a connecting element being driven by a device which transmits the displacement of the parts of the vehicle seat and brought back to the desired position in which the vehicle sensor is held in the direction of

Earth acceleration.

  With this embodiment, there is however the drawback that the movements of the seat are first analyzed, then transmitted to the sensor sensitive to the movements of the vehicle arranged on the take-up drum via a link.

  its complex mechanics. This device is distinguished

  advantageously by an expensive construction and a setting

to the point complicated.

  The object of the present invention is to improve a seat belt system of this type so as to

  allow direct conversion of the tilt motion

  sound of the record while maintaining a structural arrangement

  simple sensor on the take-up drum.

  The present invention has the basic idea of arranging.

  between the sensor located on the drum and the movement of the backrest, a flexible shaft and connect it

  to the sensor and the seat fitting so that it

  resists torsion, the axis of rotation of the sensor on the

  take-up drum housing passing through the

  latching formed by the engagement of the sensor lever on the teeth of the control disc. There is thus this advantage that the conditions for engaging the lever of the

  sensor on the toothing of the control disc are also

  independent of the position of the sensor housing.

  Due to the torsion-resistant connection between the sensor housing and the seat fitting via a flexible shaft, a synchronous rotation of the housing and the sensor is obtained in conjunction with the displacement of the seat back, so that the sensor housing always remains aligned with the direction of the terrestrial acceleration relative to the position of the whole detector or is brought back there automatically, when the inclination of the backrest

  of the seat is changed. In this way we can avoid before-

  the arrangement of intermediate gears or lever systems for the transmission of movement

of the seat back.

  The present invention provides, in certain embodiments, various arrangements for connecting the rotary shaft with the take-up drum, respectively, with its sensor device, because depending on the position of the take-up drum in the backrest and the execution of the movement of that - here to the left or to the right on the seat, it will not be necessary to ensure a constant connection, respectively, a constant support of the flexible shaft on the housing

sensor.

  A first embodiment starts from the execution

  synchronous movement of the backrest vis-à-vis the winding drum sensor housing and the invention proposes, for this purpose, to directly attach the flexible shaft to the axis of

  rotation on the sensor housing. The link to conforma-

  tion between the flexible shaft and the sensor housing on the one hand and also between the flexible shaft and the seat fitting on the other has the particular advantage that it is no longer necessary to adjust the blocking system sensitive to vehicle movements after mounting the reel drum in the seat back, since it is only possible to link the flexible shaft with the sensor housing and with the seat fitting only in a unique position, so that, when the parts are connected to each other, it Fe already produces a corresponding alignment. This ensures a mounting

simple and advantageous.

  Another embodiment of the invention provides a solution for executing the movement of the backrest.

  seat and take-up drum, in which the shaft

  ple is subject to pivoting in the opposite direction, so that a change in the direction of rotation during the movement of the seat back is necessary to bring the sensor unit back. The invention proposes, for this purpose, that the flexible shaft meshes with a circular arc mounted to rotate and that this is coupled to the housing of the

  shape sensor by shape adaptation for a movement

  rotating, the radii of the circular arc and of the box

  tier of the sensor being adjusted so that the axis of ro

  The sensor housing passes through the point of engagement of the sensor lever. The movable coupling of the parts is done, in a preferred embodiment of the invention, by an intermediate gear which allows

  this effect a multiplication in the ratio of 2: 1.

  A third embodiment of the invention shows a connection of the flexible shaft with the housing of the

  sensor in an angular arrangement which allows

  carefully to make arrangements different from the

  flexible bre and reel drum. Similarly, in this embodiment, the sensor housing is partially shaped in an arc of a circle and has a radius of dimension such that the point of rotation of the sensor housing coincides with the point of engagement of the lever.

of the sensor.

  On the outer periphery of the sensor housing

  shaped like an arc, we can arrange it in any way

  conch, via a bevel gear link, a piece

  linked to the flexible tree by adapting shapes.

  A particular problem arises when carrying out

  tion of the present invention; the tilting motion

  sound of the file can be done in relation to several axes

  of rotation; This is how, alongside a movement of in-

  direct tilt of the backrest against the surface of the vehicle seat, there is also seat tilt

  as a whole which changes the angle of the backrest and in-

  fluence the corresponding position of the system sensitive to the movements of the vehicle of the take-up drum arranged in the backrest; for this purpose, other axes of rotation which overlap each other, can be envisaged

  for movement of the seat back.

  Another object of the invention consists in conforming the arrangement of the flexible shaft in the seat back so that a return of the system sensitive to vehicle movements is ensured in the winding drum integrated into the seat back also via several axes. independent of each other to change

  the position of the vehicle seat backrest.

  The present invention refers, for this purpose, to the concepts developed in the exemplary embodiments in which the flexible shaft is guided parallel to each axis of rotation allowing the movement of the backrest via a

  section provided for this purpose, respectively, and is main-

  held correspondingly on the seat. It follows this advantage that, during a displacement of the backrest around the axis of rotation concerned, due to the drive and the tightening of the flexible shaft on the seat, in a section parallel to the axis of rotation, the flexible shaft is subjected to a relative movement which opposes its fixing

  on the seat, which movement will be transformed into

  rotary which will have the effect of recalling the system

  sensitive to vehicle movement on the reel drum

  their. In this way, serial drive couplings of the flexible shaft will be possible on several

  axes of rotation, by installing the supports and

  flexible shaft parallel to the respective axis of rotation. According to one embodiment of the invention, provision is made to arrange, in the seat back, a socket enclosing the flexible shaft, the axis of rotation of which is arranged parallel to the axis of rotation assigned to the movement of the back from the headquarters. In this way, when the flexible shaft is mounted fixed in the vehicle seat, the longitudinal axis of the bushing enclosing and driving the flexible shaft will coincide with the axis of rotation concerned, this effect also being valid for the fixing of the flexible shaft on the seat so that the flexible shaft is mounted fixed in the axis of rotation, for example, to

the seat tilt.

  The invention is however not limited to the agency-

  fixed shaft of the flexible shaft in the seat back and the associated arrangement of the sleeve in the respective axis of rotation, because other integrations in the

  seat back does not, in certain circumstances

  constancies, such a flexible shaft drive. In cases of this type, the sleeve which drives the flexible shaft need not necessarily coincide with the axis of rotation concerned for the movement of the backrest, but can also be arranged with a certain offset with respect to this axis of rotation. by arranging the section of the flexible shaft which is received therein parallel to the respective axis of rotation. Like, in such cases, when moving the seat back around the axis of rotation

  concerned, an additional rotational force is applied

  flexible shaft, fixed mounting of the flexible shaft in the backrest is not possible. As compensation, the present invention provides for

  the flexible shaft by a section to be determined arranged li-

  loosely, without fixing, leading to the relevant socket

  born, respectively, up to the point of articulation of the flexible shaft. For this purpose, the degree and direction of this additional rotation depends on the position

  of the flexible shaft support with respect to the axis of rotation

  tion considered for the displacement of the seat back as well as of the length 1 of the free mounting, so that, thanks to these parameters, it is also possible to obtain a

  multiplication in one direction or the other of the movement-

  rotation caused by the movement of the seat back in the rotational movement of the flexible shaft and therefore also in the return movement of the

  system sensitive to vehicle movement on the drum

rewind bour.

  according to another embodiment of the invention, the flexible shaft is fixed to the seat fitting, in the axis of rotation of the backrest, so that, by pivoting the backrest towards the surface of the actual seat of the vehicle , a relative movement of the flexible shaft driven in the backrest, relative to its fixed clamping point on the seat fitting, is converted into a rotary movement to bring back the movement-sensitive system

  of the vehicle on the take-up drum.

  Another problem which arises for the implementation of the present invention lies in the fact that, when

  the seat, for example as part of an upward movement

  of the latter, can also pivot around an axis which is outside the arrangement of the flexible shaft or cannot be engaged by the latter due to the distance, relative movement of the seat with respect to the flexible shaft during a pivoting of the seat around

  an axis that is outside is not achievable.

  However, since the pivoting of the seat of the complete vehicle also entails a change in position of the take-up drum, and, consequently, a change in the alignment of the system sensitive to the movements of the vehicle in the direction of the terrestrial acceleration, bring the sensitive system back in place during such seat pivoting. As in

  the occurrence, the position of the file vis-à-vis the

  face of the seat remains the same, the pivoting of the vehicle seat cannot be transmitted directly to the sensor of the

vehicle via the flexible shaft.

  Another objective of the invention consists in providing a solution which allows the system sensitive to the movements of the vehicle to be recalled via the flexible shaft, even in

  if the seat swivels around an axis of rotation

  tion located outside the tree arrangement

'flexible.

  the invention also provides, for this purpose, to implement the concepts developed in the embodiments, namely that the displacement of the articulation point of the flexible shaft, during the pivoting movement of the seat, can be transformed in rotation of the flexible shaft via a gear with return of the housing

  sensor on the take-up drum. In this case, the in-

  vention takes advantage of the fact that the flexible shaft passes through the seat fitting and is connected to a lever so as to resist torsion. When pivoting the

  headquarters around an axis located outside this agency-

  The lever tries to follow the pivoting movement and, consequently, the position of the lever relative to the direction of acceleration of gravity should change from the pivoting angle of the seat. As, according to the invention, the lever is fixed in place by a gear so that the displacement of the seat fitting and,

  consequently, the articulation of the flexible shaft at its end

  upper mite, always done at the same angle with respect to the direction of terrestrial acceleration, due to the forced linear drive, the pivoting of the vehicle seat is transformed into a rotation of the flexible shaft which is transmitted directly to impose

  a reminder of the vehicle sensor on the take-up drum.

  According to exemplary embodiments of the invention, the forced drive lever is part of a parallelogram guidance system, which in turn is based on the seat, in particular, on the movement mechanics

  in height of the seat and thus allows the displacement pa-

lever lever.

  According to another embodiment of the invention, the lever is shaped as a linkage which extends in the direction of movement of the seat fitting so that the lever which supports the flexible shaft is always moved at the same angle vis-à-vis the

  direction of terrestrial acceleration.

  According to a third embodiment of the invention

  tion, it is planned to fix the lever, at its other end

  movable mite to a guide which is fixedly mounted for its part on the vehicle seat and can pivot

  around the axis of rotation of the seat.

  Another problem lies in the fact that the backrest not only performs a tilting movement, but depending on the construction method of the vehicle, is also folded forward, the accelerations that occur

  during such a changeover which can be quite significant

  so that the take-up drum sensor integrated in the backrest is activated and the take-up drum can thus be blocked by stopping the extraction movement of

  la. belt, it is therefore also provided, according to examples-

  ples of realization of the invention, a device allows-

  as much to prevent the engagement of the sensor lever in the teeth of the control disc, during a tilting movement of the seat back, so that one can

  2D as well; during the normal tilting movement of the back-

  sier, return the sensor to its position via the movement

applied to it.

  According to another exemplary embodiment of the invention

  tion, a lever is mounted on the sensor lever

  stop connected to a release lever for the back-

  sier, this stop lever being fixed to the sensor lever when the unlocking lever is actuated. As, in the perspective of a complete tilting of the seat back, it must first be unlocked, the lever

  of the sensor is fixed to the unlocking lever,

  Finally, a blockage of the sensor lever does not occur, although naturally, due to the pivoting movement of the backrest and the coupling to the seat fitting via the shaft, the sensor will again be subjected to a

torsion.

  As another solution to this problem, provision is made, in accordance with one embodiment of the invention, for a lever to be mounted on the sensor lever.

  probe which slides along a conforming guideway

  suitably placed on the take-up drum; this

  guideway is shaped with respect to the drum

  roller so that the sensor lever is immobilized,

  via the guide lever, in the tilt path

  located outside the trajectory of the movement

  normal tilt, while the guide track releases the feeler lever outside the tilt path in the area of the normal tilt movement path so that the sensor lever

can play its role.

  In the drawings were taken forms of rea-.

  Lisation of the invention which have been described later in more detail. In the drawings: Figure 1 shows a folder with a drum

  belt retractor which allows to proceed in synchro-

  nism of moving the backrest and recalling the sensor; FIG. 2 represents the sensor of the arrangement according to FIG. 1 on a larger scale in lateral view; FIG. 3 represents the sensor according to FIG. 2, seen from the front; Figure 4 shows a folder with a drum

  belt retractor which allows to proceed, in the opposite direction

  pours, moving the file and recalling the sensor; 5 shows the sensor corresponding to the arrangement according to Figure 4 on a larger scale in side view; FIG. 6 represents a backrest provided with a belt reel drum with connection of the flexible shaft perpendicular to the reel drum; Figure 7 shows the sensor corresponding to the arrangement according to Figure 6 on a larger scale in side view; Figure 8 shows a seat with two axes of

  rotation to move the folder dry

  matic; Figure 9 shows a seat with a drum

  belt retractor and a flexible shaft representing

  graphics; FIG. 10 represents schematic arrangements of the support axis of the flexible shaft with respect to the axis of rotation for the movement of the backrest; Figure 11 shows a vehicle seat in schematic side view; FIG. 12-represents, on a larger scale, the gear serving to recall the point of articulation of the flexible shaft;

  Figure 13 shows another form of embodiment.

  tion of the invention according to Figure 3; Figure 14 shows a sectional view of the seat back of the vehicle; Figure 15 shows, on a larger scale, the arrangement for fixing the sensor lever;

  figure 16 represents the trajectories of

  possible placement of the file; Figure 17 shows, on a larger scale, the guide arrangement for fixing the lever

of the sensor.

  / A belt reel drum 12 is integrated into the backrest 10 using a fitting 11 of the seat, the reel drum 12 being connected to the fitting 11 via a flexible shaft 13 so that a modification of the inclination of the file 10 in the direction of the double arrow 14

  is transformed into a rotational movement of the shaft

ple 13.

  In Figure 2 is shown schematically a sensor 15 which cooperates with a control disc 16 and an external toothing 17 which is located thereon. The sensor 15 comprises a housing 18 in the form of a cap in which a solid sphere 19 is arranged so as to be able to roll freely; on the sphere 19 is arranged a lever 21 mounted for rotation about an axis 20 on the housing 18 of the sensor, which lever can pivot, by modification of position of the sphere 19 in the housing 18 following accelerations or decelerations of the vehicle, from the rest position shown in FIG. 2 until the engagement of its tip 22 in the

  toothing 17 of the control disc 16. The engagement point

  ment in the engagement position of the lever 21 of the sensor in the toothing 17 and of the control disc 16 is designated by the name of interlocking point 23. In FIG. 2, the extreme positions are also indicated in dotted lines

  possible from the housing 18 of the sensor.

  The rotational mounting of the sensor housing 18 on

  the take-up drum 12 is not shown in the drawing

  sin. As can be clearly seen in Figure 3, in the embodiment shown in Figures 1 to 3, there is provided a synchronous arrangement of the fitting 11 of the seat and the drive shaft of the housing, the shaft flexible 13 being directly fixed to the housing 18 of the sensor in the axis of rotation 24 of the housing fixed by the engagement point 23, and this, via a twist-resistant shape adaptation link 25, which is in the form a plug-in connection, so that, by rotation of the flexible shaft 13 indicated by the arrow 26, the housing 18 of the sensor rotates around the axis of rotation 24 coinciding with the engagement point 23 so that ensured a synchronous recall of the housing of the

  sensor with the movement of the backrest.

  In Figure 4 is shown a form of reaction

  In which, due to the arrangement of the fitting 11 of the seat and of the take-up drum 12, an inverse arrangement of the flexible shaft 13 is obtained, which makes it necessary to reverse the direction of rotation between the fitting 11 and the return of the housing 18 of the sensor. To this end, Figure 5 shows a constructive solution of the recall of the sensor o the extreme positions of the housing

  18 thereof have been shown again in dotted lines.

  In this embodiment, unlike the form

  according to FIGS. 1 to 3, the point of

  the flexible shaft 13 on the housing 18 of the sensor and the axis of rotation 24 of the housing are arranged at a distance from each other. The flexible shaft 13 meshes, by a link 25 with adaptation of shapes, on a circular arc 27 mounted for rotation. The external configuration of the housing 18 of the sensor is adapted to conform to the rotary arc 27, so that it

  produce mutual support of the surfaces in an arc.

  In the vicinity of the mutual bearing surfaces, teeth 28 which correspond to each other have been arranged on the arc 27 and on the housing 18 of the sensor in such a way that the

  rotational movement of the arc of circle 27 is trans-

  formed in a rotational movement of the housing 18 of the cap-

  guardian; in this way, a good reduction ratio can be obtained. The radius of the housing 18 of the sensor shaped in a circle has been calculated relative to the part

  upper of the corresponding toothing 28, such

  denies that the axis of rotation of the sensor housing passes

  by the point of engagement of the sensor lever.

  In Figure 6 is shown a form of reaction

  Lization in which the connection of the flexible shaft 13 with the winding drum 12 is made at right angles so that a front portion 29 shown in

  FIG. 7 is based on the housing 18 of the sensor

  formed in an arc; the radius of the housing 18 of the

  guardian conformed in an arc has been calculated again

  so that the assumed center of the cap housing

  tor coincides with the point of engagement 23, so that a rotation of the housing 18 of the sensor is always done around

  of the axis of rotation 24 which coincides with the end point

  latching 23. The connection of the front part 29 on which the flexible shaft 13 meshes with a connection 25 with shape adaptation, with the housing 18 of the sensor can be achieved by coupling using a bevel gear. As can be seen in FIG. 8, two axes of rotation can be provided for moving the backrest 10 in a seat 9 of a motor vehicle according to the embodiment shown, namely on the one hand an axis of rotation 31 around which the backrest 10 can move with respect to the seat part 30 proper of the seat 9 and another axis of rotation 32 around which the whole seat 9 can tilt. Even when, in this embodiment of the vehicle seat, the backrest 10 remains unchanged at its inclination

  opposite the seat 30 in the axis of rotation 31, a lower

  seat 9 seat around the lower axis of rotation 32 will cause the drum position to change

  reel 12 arranged in the file 10 (Figure 9).

  As can be clearly seen in the fi

  gure 9, we have arranged between the winding drum 12, res-

  pectively, its system sensitive to the movements of the vehicle

  cule rotatably mounted in the drum housing

  their and a fitting 33 of the seat, a flexible shaft 13 which is connected to the sensitive sensor, as well as to the fitting 33 of the

  seat so as to resist torsion.

  In the axes of rotation 31, 32 formed, in this embodiment, on the seat 9, the flexible shaft 13 is first of all driven by the take-up drum 12

  up to the upper axis of rotation 31 to move it

  -35 ment of the backrest 10 vis-à-vis the seat part 30 and extends there, via a section 34 fixedly mounted along the axis of rotation 31, the section 34 of the flexible shaft 13 being enclosed by a socket 35 securely attached to the backrest and thus immobilized. From the bush 35, the flexible shaft 13 further extends to the lower axis of rotation 32 around which the tilting of the seat 9 will possibly take place; the flexible shaft 13 is connected in this axis of rotation with the fitting 13 provided for this purpose in the seat, a section of the flexible shaft 13 being aligned with the axis of rotation 32. Provided that the fasteners, respectively, the corresponding guides of the flexible shaft 13 in the backrest 10 can be aligned with the axes of rotation 31, 32 which are there

  affected respectively, a fixed mounting of the

  flexible bre 13 in file 10 is possible.

  When the backrest 10 rotates in the direction of the double arrow 26, for example, by tilting the seat 9 around the lower axis of rotation 32, this tilting movement will be transformed, due to the fixed support of the shaft flexible 13 on the fitting 33 provided for this purpose in the seat, in a rotational movement in the same direction, so that the system sensitive to the movements of the vehicle

  will be brought back to the corresponding drum

  their. Now, in the case where there is displacement of the backrest only around the upper axis of rotation 31, the section 36 arranged for example perpendicular to the flexible shaft 13 will rotate with respect to the sleeve 35, respectively screws with respect to the section 34 of the flexible shaft 13 which is adjusted thereto and this relative movement between the perpendicular section 36 and the remaining section of the flexible shaft 13 adjusted in the bush 35 and fixedly mounted on the fitting 33 of the seat will cause a rotational movement of the flexible shaft 13 in the region between the winding drum 12 and the sleeve 35 and this rotational movement may be used for the recall of the system sensitive to the movements of the vehicle on the

take-up drum 12.

  In Figure 10, there is shown, schematically, the arrangement of the drive axis or also of

  the support axis of the shaft 13 in the case where the axis, allows

  as the fixing, by sections, of the flexible shaft 13 cannot coincide with the axis of rotation 31 or 32 of the backrest

  provided for this purpose, because construction data

  tion do not allow an arrangement, for example, of the sleeve 35 in the folder 10. This is why, in the representation of Figure 10, the support axis 37 provided for this purpose for the flexible shaft 13 is shifted upwards, for example, with respect to the axis of rotation 33 of the backrest 10. The difference A between the two axes 37 and 33 is sensitive for the additional degree of rotation of the flexible shaft 13 and for the transmission fault which is linked to it during a rotation of the backrest 11 around the axis 33. For

  compensate for this defect, the flexible shaft 13 is arranged freely

  ment and without drive with a length I to be chosen in the file 10. The greater the length I with respect to the deviation A, the less one should expect the transmission fault; length 1 should preferably

  at least be about twice as large as the dis-

  tance A, because in this way, the angle S swept by the backrest during its displacement is roughly of the same order of magnitude as the angle of rotation e of the flexible shaft

  13 and this approximate angular similarity is to be considered

  derive as a preferred embodiment of the invention

  tion. Depending on the structural data, we can however accommodate larger deviations or compensate for them by other measures without, however,

  departs from the basic idea of the invention.

  The present invention is not limited to the arrangement - shown in FIG. 9 - of the take-up drum 12 and the stop 3 for the flexible shaft 13;

  the invention can just as easily be carried out by

  erasing the take-up drum 12 and the fixing 33 provided for the flexible shaft on the same side of the seat as the take-up drum so as to obtain a U-shaped arrangement of the flexible shaft 13 in the backrest 10. Even in the context of 'Such an arrangement of the flexible shaft 13, it is possible to realize the present invention with several axes of rotation for the displacement of the backrest, by ensuring that the corresponding fixing or drive elements ensure a drive by section of the flexible shaft parallel to the respective axis of rotation.,

  Furthermore, the invention is also not limited to

  tee to a precise parallel arrangement of the cross-section

  drag 34 of the flexible shaft and of the axis of rotation 31, 32 of the seat 9 of the vehicle; deviations from this parallel training will simply result in

  a greater transmission defect so that to-

  lerances are also admissible even in this area,

  in the context of the present invention.

  In Figure 11 there is shown a seat 9 of

* vehicle fitted with a backrest 10 and a pro-

  prement dit 40, the seat 9 resting on a base frame 41 and being able to pivot as a whole around an axis of rotation 42, located on the front part of the seat proper 40; For this purpose, the seat 9 of the vehicle

  has, on its rear part, a movement device

  cement height 43 of the rod type.

  In the backrest 10 of the seat 9 of the vehicle is arranged a winding drum 12, the system sensitive to the movements of the vehicle is mounted movable in a manner not shown and is adjustable in the direction of

Earth acceleration.

  -The winding drum sensor 12 is connected to a fitting 33 of the seat via a flexible shaft 13. For this purpose, the flexible shaft 13 which is located in the axis of rotation 31, around which the backrest 10 moves. vis-à-vis the actual surface of the seat 40, is adjusted on the fitting 33 and is fixed therein so as to resist torsion. In FIG. 11, the starting position of the seat 9 of the vehicle is shown in solid lines while:

  shown in dotted line the position of seat 9 of the vehicle

  turns after pivoting upwards around the axis 42. It is clear that the position of the backrest 10 vis-à-vis

  of the surface 40 of the seat has not been modified by the

  seat placement in height, so that it does not in any way have any effect on the flexible shaft 13 and, in this way, the vehicle sensor is not moved. In the same way, however, the displacement of the vehicle seat from the position shown in solid lines to the position indicated in dotted lines causes the position of the take-up drum 12 to be changed so that the vehicle sensor is pivotally released from its axis aligned with terrestrial acceleration and cannot

  because of this, function. For this reason, care must be taken

  recall the vehicle sensor, even when

  rotates the seat 9 around the axis 42.

  To perform this recall, the flexible shaft 13 is

  passed through the fitting 33 and is supported on the end

  upper half of a lever 44, so as to resist

  the torsion, this lever, in the embodiment example

  presented in FIG. 11, forming part of a parallelogram guide 45 which, for its part, is coupled to the upper end of the height-displacement device in the form of a rod 43. In this way, it is ensured that, during a pivoting of the seat 9 around the axis 42, the lever 44 is moved parallel to itself at the same angle with respect to the direction

of terrestrial acceleration.

  This displacement corresponding to a forced drive, at an angle which remains identical with respect to the direction of acceleration of gravity, causes a rotation of the flexible shaft by the same angle as that

  whose seat 9 rotates around the axis of rotation 42.

  Without the forced drive, the lever 44 would rotate at the same time as the pivoting of the seat around the axis 42 and would therefore modify its angular position with respect to

  of the direction of terrestrial acceleration. This situation

  tion is prevented by the aforementioned forced drive using the parallelogram guide 45 so that the pivoting movement of the seat 9 is transformed into a rotational movement acting on the flexible shaft 13, which rotational movement results in a reminder of

  vehicle sensor on the take-up drum 12 via the rear

flexible bre 13.

  Figures 12 and 13 clearly show other possibilities of forced training. Thus, in the embodiment according to FIG. 12, the forced drive is provided by a linkage 46 arranged in the direction of movement of the fitting 33 of the seat, at the upper end of which linkage,

  the flexible shaft is supported so as to resist tor-

  sion, by penetration through fitting 33. The trin-

  Glerie also ensures the movement of the point of articu-

  lation at an identical angle to the steering

of terrestrial acceleration.

  In the embodiment shown in FIG. 13, the lever 44, at the upper end of which the flexible shaft 13 is fixed so as to resist torsion, is connected, at its other end, so as to be able to pivot in relative to a guide 47 which is in turn linked to the seat 9 of the vehicle, so as to be able to pivot around the axis of rotation 42. In this way, pivoting of the vehicle seat will also cause the lever 44 to move without angular modification

  vis-à-vis the direction of terrestrial acceleration.

  The present invention is not limited to the forced drive included in the exemplary embodiments; the lever 44 can also be part of a gear in other possible positions, as long as the lever maintains its angular position with respect to the

  direction of the terrestrial acceleration, during a pivot-

  the seat around an axis of rotation located outside

  laughing of the flexible shaft joint.

  Figures 14 to 17 show forms of reaction

  reading of the invention in which the lever 21 of the sensor 15 is kept clear of its engagement in

  the teeth 17 of the control disc 16, when the back-

  sier is not moved as part of its normal tilt motion path, but is flipped

completely forward.

  In the embodiment shown in FIGS. 14 and 15, coupling is carried out with the unlocking lever for tilting the backrest and in this way, the unlocking lever 50, which is provided with a lever 51 to allow the unlocking the backrest, is coupled to a stop lever 53 via a connecting lever 52 so that, by unlocking the backrest in the direction of arrow 59, the connecting lever

  52 is raised and the stop lever 53 subjected to a pivot

  so that it is supported, by its front end, on the lever 21 of the sensor and does not allow it to penetrate between the external teeth 17 of the control disc 16 of the take-up drum, when the sensor is returned. After switching the backrest back to its normal position, the unlocking lever 50 also retracts to its normal position and, therefore, the sensor lever 21 is also released by removing the stop lever

  53 in order to assume its normal function.

  As another solution, according to FIGS. 16 and 17, the device which makes it possible to disconnect the sensor can also be adapted to a trajectory of the movement.

  of normal inclination 54 and a tilting trajectory

  Lement 55 which is established differently. To this end, the take-up drum 12 includes a guide track 57 on which a feeler lever 56 connected to the lever 21 of the sensor slides. This guide track has a step 58 shaped so that, on the trajectory of the tilting movement 54, the feeler lever 56 of the lever 21 of the sensor has a corresponding degree of freedom such that the lever 21 of the sensor can perform its function.

  by pivoting in the teeth 17 of the control disc 16.

  When, however, the file 10 is subjected to a pivotal

  in the region of the tilting trajectory

  , the relative rotation of the sensor 15 with respect to the drum

  rewinder 12 is such that the connected part of the slide 57 comes to lodge in front of the feeler lever 56 of the lever 21 of the sensor, so that the lever 21

  of the sensor is prevented from pivoting and is therefore immobilized

  read. The switch back of the file 10 causes,

  again, a return to the starting position shown

  felt in solid lines in FIG. 17, in which position the lever 21 of the sensor can be housed in the

  external teeth 17 of the control disc 16; the disposition-

  tion of the slide 57 with its step 58 opposite the tilting trajectory 55 of the backrest 10 has been,

  on the other hand, shown in dotted lines.

  The present invention also consists in arranging the take-up drum, including its control system sensitive to the movements of the vehicle, so that it can rotate as a whole in the backrest, the take-up drum being brought back, during a modification of backrest, in a position in which

  the movement-sensitive control system

  cule can operate effectively without any problem. In this

  effect, the take-up drum is linked to the movement of the back-

  sier, via a flexible shaft whose respective ends are mounted so as to resist twisting. In accordance with the principle of the embodiments of the invention described above, the flexible shaft 13 is engaged on the reel drum so that it can rotate

  around the axis of its shaft as the center of rotation.

  Finally, it will be understood that, in all embodiments, the flexible shaft 13 must be mounted so

resistant to torsion.

Claims (27)

- CLAIMS -   1. Seat belt system with drum   self-locking reel integrated into the back of the vehicle seat   hicuie, which rewind drum has at least one   positive control sensitive to vehicle movements to cause the belt unwinder / rewinder shaft to lock, during acceleration or deceleration   acting on the take-up drum, the   control sensitive to the movements of the vehicle being mounted at   rotation with respect to the take-up drum and able to adapt   ter its position at the inclination of the backrest, characterized in that between the sensor (13) and a fitting (11,33) of the seat, is arranged a flexible shaft (13) which is connected so as to resist torsion respectively with the sensor housing (18) and the seat fitting (11, 33) and in that the axis of rotation (24) of the sensor housing (18) on the drum housing passes through the point d 'engagement (23) formed by the engagement of the lever (21) of the sensor on the teeth (17,16) of the disc control.   2. Seat belt system according to the res-   dication 1, characterized in that the sensor housing (18) is rotatably mounted on the drum housing and the flexible shaft (13) meshes directly   in the axis of rotation (24) on the housing (18) of the cap-   teur was connected to the fitting (11,33) in an agency- synchronously.   3. Seat belt system according to the res-   dication 2, characterized in that a connection is provided between the housing (18) of the sensor and the flexible shaft (13) with shape adaptation (25).   4. Seat belt system according to the res-   dication 1, characterized in that the flexible shaft (13) extends in a synchronous arrangement between the fitting (11) of the seat and the sensor (15) and meshes with a circular arc (27) mounted for rotation and in that the circular arc (27) is coupled to the housing (18) of the sensor which adapts to it, by adaptation of shapes, for a rotary movement, the radii provided for the circular arc the housing (18) of the sensor being calculated so that the axis of rotation (24) of the housing (18) of the sensor passes through the point of engagement (23) of the lever (21) of the sensor.   5. Seat belt system according to reyven-.   dication 4, characterized in that a toothing (28) is formed on the facing surfaces of the arc (27) and of the housing (18) of the sensor, respectively, so to mesh with each other.   6. Seat belt system as claimed   cation 1, characterized in that the flexible shaft (13) is coupled to the external side of the sensor housing (18) shaped in an arc, the radius of the sensor housing (18) being calculated so that the assumed center of the housing (18)   of the sensor goes through the switch-on point (23).   7. Seat belt system, as claimed   dication 6, characterized in that the sensor housing (18) is coupled to a connection connection (29) for   the flexible shaft (13) via bevel gears.   8. Seat belt system according to one   conch of claims 1 to 7, characterized in that the   sensor (15) sensitive to vehicle movements is configured as a spherical sensor with a housing (18) in the shape of a cap and a lever (21) of the sensor which is rotatably mounted thereon and can be pivoted under the action of the solid sphere (19) by displacement in the housing (18) until it engages   in the teeth (17) of a control disc (16).   9. Seat belt system according to one   conch of claims 1 to 8, moving the backrest   taking place in relation to several axes of rotation, 26S0234   characterized in that the flexible shaft (13) is driven   via a section (34) provided for this sensitive purpose-   parallel to each axis of rotation (31, 32) to   moving the backrest and supported on the seat (10).   10. Seat belt system according to claim 9, characterized in that, in the backrest (10), is arranged a sleeve (35) which encloses the flexible shaft (13) and whose longitudinal axis is aligned parallel to the axes of rotation provided for this purpose (31,32) for the moving the seat back.   11. Seat belt system according to one of   claims 9 or 10, characterized in that, for each   effective axis of rotation (31,32) of the movement of the backrest, a separate sleeve (35) is provided for fixing and guiding the shaft section (34).   12. Seat belt system according to one of the re-   vendications 9 to 11, characterized in that, in the flexible shaft (13) which is fixedly mounted in the backrest (10), the axis   longitudinal of the sleeve (35) which encloses the shaft   ple (13) coincides with the axis of rotation (31,32) of the the file.   13. Seat belt system according to one of   Claims 9 to 11, characterized in that the socket   (35) is arranged relative to its longitudinal axis, at a distance (A) from the corresponding axis of rotation (31,32)   of the backrest movement and the flexible shaft (13) is   dragged by a section 1 free ascent to the socket (35).   14. Seat belt system according to one of   Claims 9 to 11, characterized in that the attachment   of the flexible shaft (13) on the fitting (33) of the seat   made in an axis of rotation provided for this purpose (31,32).   15. Seat belt system according to the res-   dication-13, characterized in that the fixing of the flexible shaft (13) is carried out offset with respect to an axis planned rotation (31,32).   16. Seat belt system according to one of   Claims 1 to 15, characterized in that the attachment   of the flexible shaft (13) on the fitting (33) of the seat is carried out in the axis of rotation (31) of the backrest (10)   vis-à-vis the surface (40) of the seat.   17. Seat belt system according to re-   vendication 16, characterized in that the seat (9) of the vehicle can, moreover, pivot around an axis of rotation (42) located in the seat (9), outside the point of articulation (33) of the flexible shaft (13), and that the displacement of the articulation point (33), during the   seat swivel, can be transformed, via a gear   swimming (44, 45, 46, 47) in rotation of the flexible shaft (13)   with reminder of the sensor housing on the reel drum their (12).   18. Seat belt system according to the res-   dication 17, characterized in that the flexible shaft (13) is guided through the fitting (33) of the seat and is fixed so as to resist torsion on a lever (44) which forms, during the pivoting movement of the seat (9), a forced drive for the articulation point of the flexible shaft (13), maintaining the same angle respectively   vis-à-vis the direction of terrestrial acceleration.   19. Seat belt system according to the res-   dication 18, characterized in that the lever (44) is part of a parallelogram guide (45) mounted on the seat (9).   20. Seat belt system according to re-   vendication 18, characterized in that the lever is part of a linkage (46) which is located in the connection between the movements of the fitting (33) of the seat when pivoting of it.   21. Seat belt system according to the res-   dication 18, characterized in that the lever (44) is connected, at its other end, in a mobile manner to a   guide (47) mounted fixed on the seat (9) and which can pivot   ter around the axis of rotation (42) for movement from the headquarters.   22. Seat belt system according to one of   claims 1 to 21, characterized in that a device   (50, 53; 56, 57) is provided to prevent the engagement of the lever (21) of the sensor in the teeth (17) of the disc.   control (16) during a tilting of the backrest (10).   23. Seat belt system according to resale   dication 22, characterized in that, on the lever (21) of the sensor, a stop lever (53) is engaged! connected to an unlocking lever (50) for the backrest (10) of the   seat, this stop lever blocking the lever (21) of the cap-   when the release lever is operated.   24. Seat belt system according to the res-   dication 22, characterized in that the lever (21) of the sensor (15) of the take-up drum (12) is blocked, via a guide arrangement (56, 57) on a path of   tilt (55) which is located outside the track   jectory of the tilting movement (54) of the backrest (10).   25. Seat belt system according to   claim 24, characterized in that the reel drum   their (12) has a guide track (57) for a feeler lever (56) mounted on the sensor lever (21) and in that the guide track (57) releases the lever   feeler (56) on the tilt movement path   sound (54) and blocks it on the tilting trajectory (55) of the file (10).   26. Seat belt system with a self-locking rewind drum integrated into the seat back of the vehicle, which drum has at least one control device sensitive to vehicle movements to cause the blocking of the rewind / rewind shaft of the belt , during accelerations or slowdowns affecting the take-up drum, this   winding drum being able to adapt its position   tion at the inclination of the backrest, characterized in that, between the winding drum (12) and the movement of the backrest (11), is arranged a flexible shaft (13) resistant to tor-   and that it is respectively connected in a resis-   both when twisting the reel drum (12) and when moving   ment of the backrest (11), the axis of the shaft (13) passing in   additionally by the axis of the reel drum shaft.   27. Seat belt system according to the res-   dication 26, characterized in that the axis of rotation (24) of the winding drum mounted for rotation in the seat back coincides with the axis of the shaft, this shaft (13)   being rotatably mounted on the drum housing.