FR2600598A3 - Device for adjusting the position of vehicle seats - Google Patents

Abstract

A. DEVICE FOR ADJUSTING THE POSITION OF VEHICLE SEATS. B. DEVICE CHARACTERIZED IN THAT, INSIDE THE ARM REST 2 IS FIXED A BODY OF PRISMATICAL SHAPE 4 WITH ORIFICES 5, 6 OR PASSES A VERTICAL AXIS 3 CONTROLLED BY A PUSHBUTTON 1, WHILE 'A PIVOT 7 WHICH EXCEEDS THIS AXIS IS BASED ON CURVILINE NOTCHES OF A PROFILE 9 OF GENERAL "U" SHAPE TILTING INSIDE THE SUPPORT 4 PROPERLY CALLED; THE INTERMEDIATE BRANCH OF THIS PROFILE 9 BEING PRESSED ON THE END OF THE ROD 17 OF A PNEUMATIC CYLINDER 18 SO THAT THE ACTUATION OF THE TAPPET 1 UNLOCK THE PNEUMATIC CYLINDER 18. C. THE INVENTION CONCERNS A DEVICE FOR ADJUSTING THE VEHICLE SEAT POSITION

Description

1 DEVICE FOR ADJUSTING THE POSITION

OF SEATS OF VEHICLES

  The present invention relates to a device for adjusting the position of vehicle seats, applicable to all kinds of seats of vehicles intended for the transport of steps

  sagers, such as buses, planes, railways, etc.

  This device comprises means for realizing the unlocking of the transverse displacement mechanisms of the seats aligned in file, and it comprises, in additionmeans for folding the backrest of each seat, to establish in the latter JI case, three different positions of the armrest, that is to say a horizontal position in which the armrest performs its normal function, a position in which the armrest is upwardly oriented to facilitate the access of persons to the adjacent seat, and a third position in which '1 armrest is downwardly in contact with the carcass

  Lateral seat to facilitate, in the latter case, pas20 wise people in the corridor of vehicles.

  The means that allow the transverse displacement of the seats, as well as the means for folding the backs, are based on the use of pushers located on the upper face of one of the armrest of the seat. By acting by means of the pusher on a mechanism which vertically moves a tilting rod, one of the claws which act on slides in the lower zone of the seat is separated so as to allow the latter to move in the transversal direction. By actuating the other pusher is also acts on a movable pin which is provided with the free end of the rod of a pneumatic piston. By acting on this pusher, the latter, by means of the mechanism in question, transmits its movement to the nipple of the rod, which gives rise to the locking or unlocking of the pneumatic piston and, consequently, allows that, when the user exercise with his back a close

  against the back of the seat, it tilts backward or tilts forward.

  In the field of public transport, buses, planes, railways, etc ... studies are carried out constantly. as regards the location, the structure and even the services which correspond to the seats of these vehicles, in order to make maximum use of the available space and to ensure that passengers are installed as comfortably as possible. In this sense, the seats or chairs of the passengers are arranged on each side of a central corridor, and therefore to make the most of the habitacle of the vehicle, it is sometimes installed several seats on each side of the corridor. question, which makes it possible to obtain a greater capacity of travelers but to the detriment of the convenience of these. To avoid the inconvenience of the transport vehicles in question, it has been provided the possibility of moving the seats in the transverse direction to occupy the access corridor when the passengers have settled on their respective seats. To obtain the transverse displacement of the seats several systems are known among which we can mention, for example, those which are based on guides which comprise at their base a rod endowed at its ends with locking pins of a rack, of so that at the ai25 of appropriate means, the rod tends to maintain permanently in the locking position of the rack and therefore irremovable attachment of the seat, while the rod can be manually operated to unlock it and to allow free movement of the seat * 30 on the corresponding guides. Among the known devices for carrying out these operations, the most important is that which is based on a pusher which is secured to a flat bar in which are formed three branches, an upper attachment branch to the pusher, an intermediate branch and

  vertical separation between these two extreme branches and one.

  1 a lower branch that allows to act on the blocking rod. In accordance with this construction, when one acts on the

  pushing the flat bar vertically, which results in the downward movement of the rod and, consequently, the unlocking of the mechanism, which allows the transverse displacement of the seats.

  However, devices and / or mechanisms of this type are quite complex, so that, on the one hand, their

  The cost is quite high and, on the other hand, their operation is not the most adequate and effective.

  With regard to the mechanisms for adjusting the position of the back of a seat, so that the user can obtain the most comfortable position he desires, there are also different solutions, one of which is the Moreover, it is based on the use of a pneumatic cylinder whose free end of the rod associated with the piston is provided with a movable pin which can protrude axially and which acts as a locking means for the pneumatic cylinder, in such a way that, when the stud is in a projecting position, the pneumatic cylinder acts as a rigid element and, consequently, the backrest can not move, whereas when the stud is in the retracted position, the pneumatic cylinder is released and when applied a pressure tends to project the folder to the position

  previous limit, which allows at the same time that the folder 25 can be folded back by means of a simple pressure applied to him by the back of the passenger.

  To actuate the pin in question, there are dis positives constituted by a pusher with which cooperates a guide mechanism and which is associated with a series of elements 30 by means of which is obtained the actuation of the pin in question and, consequently , blocking or unlocking the pneumatic cylinder. However, devices of this type have the disadvantage of being too complex as regards the number of parts and elements that compose it because, independently of the aforementioned guiding mechanism, there are elements such as a tilting lever intended to act on the pin of the pneumatic cylinder rod, "U" profiles with which are associated countless parts, etc., so that the whole mechanism is at the laws complicated and expensive. With regard to the adjustment or tilting of the armrest of the seats, there is no doubt that there are also mechanisms by means of which is obtained the displacement up of the armrest, but no device

  is known to perform the vertical movement of the armrest down.

  A fundamental object of the invention is to provide a device by means of which it is possible to fold

  the backrest of transport vehicle seats, in a simple and efficient way.

  A second object of the invention is constituted by a

  device by which the transverse displacement of the seats 20 is obtained to make the most of the passenger compartment of the vehicle.

  A third object of the invention is constituted by a device by means of which it is possible to tilt the armrest, both to orient it vertically upwardly as for orienting it vertically downwards, and which comprises naturally an intermediate position of blocking or uti

normal use of the armrest.

  With regard to the device which corresponds to the first object of the invention, that is to say that which is provided for folding the seat backrest, it has been designed to perform this function in a simple and effective way, with a minimum number of parts, and so that the operation of the assembly is virtually free of any type of anomalies. More specifically, this device intended to ensure the folding of the backrest is constituted by a piece of general shape prismatic which serves as a support, and which is fixed

  on the seat frame and preferably on the armrest.

  This prismatic part or support is provided with a vertical passage in which can move up and down an axis on '1 upper end of which is fixed the corresponding pusher located within reach of the passenger and, obviously, in a location that does not interfere in any way movements

  the arms or hands that this passenger might have when he sits comfortably in the seat.

  Inside the prismatic piece which constitutes the support in question is housed, in turn a profile of general shape in "U" whose side branches have, in front of one of its longitudinal edges, more precisely opposite 15 of the upper edge, according to 1 location of the entire device on the seat, curvilinear housings in which R a pivot that protrudes outside and radially from

  of the axis with which the pusher is associated, this pivot being guided by elongated orifices formed for this purpose in the support.

  The piece or profile in M "U" in question is articulated transversely and close to its central branch, so that the profile in question can rotate or tilt so that its central branch rests on the nipple correspon25 dant of the pneumatic cylinder rod, which rod is connected in turn to the support, with the possibility of turning relative to the latter, thanks to a hinged part on the support, and which is precisely the part on which is articulated the profile in

  "U" which is intended to rest on the control pin of the pneumatic cylinder.

  Thanks to the construction described, it is obvious that the unlocking of the backrest can be obtained by simply acting on the pusher, because by exerting a pressure on the latter, which gives rise to the displacement of the axis of which it is integral, it is obtained downward movement of the fulcrum 1 integral radiai of this axis, pivot which relies on the end zones, more precisely on the short recesses provided in the end zones of the lateral branches of the profile in " U "will cause the tilting of the latter and cause its intermediate branch exerts pressure against the end of the integral pin. the rod of the pneumatic cylinder, giving rise to the operation of the latter and, consequently} allowing a simple pressure exerted by the back-of the user to produce the pivoting of the file in question. Regarding the second object of the invention, that is to say the device by means of which is ensured the transverse displacement of the seat, it uses in common with the previous device the prismatic piece which serves as a support. Through this prismatic piece can move, upwards and downwards, another vertical axis secured in its lower part to another pusher located near the pusher which is part of the device which has been described above, while the lower end of the axis in question, which corresponds to this second device, acts on the rod or the lever which activates the locking mechanism, rod which, thanks to a spring, tends to occupy permanently a position blocking, this rod being additionally endowed with a tooth which is integral therewith and which ensures the locking of the slide provided in the anchoring support

seat on the floor of the vehicle.

  It follows from what has just been explained that by acting on the pusher, the fixed axis of the latter will move downwards by pushing in turn the rod or the lever which, by opposing the action of the spring connected thereto, releases the corresponding slide, thereby allowing the seat or the seat to move transversely, as long as

  it acts on the pusher in question.

  Regarding the third object of the invention, that is to say the mechanism that allows the pivoting of the support arm, it consists mainly of an axis fixed on the carcass of the seat. The free end of this arm is provided with a cam which is fixed thereto in a rigid manner and on which is mounted so as to freely rotate the armature of the corresponding arm. A ratchet installed in the armature of the arm collaborates with the cam in question and, therefore, can move around the fixed axis, accompanying this arm in its tilting movement at the same time that the ratchet can switch on itself. same and in relation to the arm because it is connected to this

  last, using a tilting axis.

  To complete the structure described, on the free end in question of the fixed axis and also so as to be able to rotate freely. is mounted an immobilizing plate provided with a radial extension which is located opposite the ratchet and which has at its free end a bent tooth blocking 15 ge of the ratchet in question, in an operating position

  the axis in question is also provided with a helical spring which is fixed at one of its ends to the immobilizing plate in question and at the other end to the ratchet, this spring tending to bring these elements closer together, so that the ratchet in question is in permanent contact with the periphery of the cam.

  This cam further comprises a step in which the end of the ratchet opposing the immobilizing plate is recessed in the horizontal position of the armrest which corresponds to its normal use. From this normal position, the armrest can swing freely upwards to reach a limit position of adaptation of the support arm to the seat back in which the cam, by means of flat sectors formed in the latter and on the ratchet itself forces the latter to adopt a position in which a claw located in its end zone close to the immobilizing plate penetrates into the bent tooth of the latter, so that the ratchet is locked relative to to the immobilizer plate, or more precisely can not rock, which allows, during a subsequent pivoting of the armrest, 1 the opposite end of the ratchet moves radially to '1 outside relative to the cam and therefore without producing the blockage of the latter, and can exceed the horizontal position that corresponds to its normal use, to reach the third position of use of this restraint, dan where the latter is oriented toile: low. The immobilizer plate mentioned above has, in turn, a step on its edge, while the cam has a pin oriented towards this step and, consequently, this cam which is driven by the arm during its swing towards the bottom and because of the action of the spring which tends to keep it close to the ratchet, will accompany the movable assembly to exceed the ttable intermediate position, that is to say the horizontal position, after which the step in question carries 15 ra on the stud of the cam to retain the plate while the ratchet will continue to move, so that it will release the tooth bent of this plate and can tilt, under the effect of the cam, this tilting movement being limited by a

  another step formed in the cam in question.

  From this position, it is clear that the elevation of the arm to the horizontal position allows the locking of the ratchet in the other step of the cam, so that the ratchet will stop being blocked by the immobilizer plate and this

  horizontal position can be maintained stably.

  Therefore, from the horizontal position of the arm, the arm can move freely to the position in which it is oriented vertically upwards, after which it can move to the position in which it is fully oriented vertically downwards. . In order for it to be able to move from the position in which it is oriented upwards to the horizontal position, it must slightly exceed the latter in order to unlock the ratchet and, after this unlocking, which can be easily detected by the noise produced by the ratchet striking against the cam of the cam, it is necessary to exert on the arm a slight pull upward until a new noise indicates that the corresponding step has been exceeded .

  Other features and advantages of the invention will be better understood on reading the following description of an exemplary embodiment and with reference to the drawings.

  in which: - Figure 1 shows a side view of the devices by means of which are obtained the pivoting of the backrest and the transverse displacement of the seat. These devices are mounted on the armrest of a seat and one of them is associated with the pneumatic cylinder responsible for acting on the locking mechanism of the backrest to allow the pivoting of the latter, while '1 another device is associated with the rod or le 15 vier that allows to unlock the means that tend to constantly immobilize the seat; - Figure 2 shows a schematic view of the profile "U" i which is the basic part of the device by means of which is obtained the pivoting of the backrest, this profile a20 directly sliding on the corresponding pneumatic cylinder; FIG. 3 represents an elevational view of the pivoting device of the armrest of the seat in which the armrest in question adopts the intermediate or horizontal stable position, that is to say the one corresponding to its Normal use; FIG. 4 represents a cross section of the whole of the device represented in the preceding figure,

  along the section line A-B of this figure.

  The figures described above, and more specifically in Figures 1 and 2, show that the actuating device of the pivoting mechanism of the seat back according to the invention is constituted by a pusher 1 which is preferably integrated inside the armrest 2 of the seat, being accessible from the upper or outer side so that it can be actuated by the passenger or the user. This pusher 1 is integral with an axis 3 which is extended downwards and can move inside a generally prismatic piece 4 which acts as its port, the latter being fully integrated and hidden inside. of the armrest 2. Naturally this part or this support 4 has an upper orifice 5 and a lower orifice 6 for the passage of the axis 3 in question, so that the latter, being secured to the pushbutton 1, can be moved up or down when acting on the

  push 1 up or down.

  From the axis 3 in question emerges radially and outwards a pivot 7 guided by respective elongate holes 8 provided for this purpose in the support 4, all this so that, when the axis 3 moves up

  or downwards, the pivot 7 secured to this axis can also move.

  Inside the support 4 is mounted, in turn a pro-.

  wire 9 in the general form of, U ,, (see Figure 2) which, in its side branches 10 and near its intermediate branch 11, has orifices 12 which serve to accommodate an axis of rotation 13 around which can tilt the room or the "U" -shaped profile 9 The upper edge of the lateral branches 10 of this profile 9, according to the position occupied by the latter in the assembly 25 of the mechanism, comprises curvilinear cuts near its edge or its free end. 14 in which-relies

the pivot 7.

  On the other hand, on the support 4 is also articulated

  by means of the axis 15, a part 16 connected to the rod 17 of the pneumatic jack 18 and in this way the rod 17 is connected to the sup-.

  port 4 with the possibility of turning relative to the latter, because of the articulation formed by the axis 15. From 1 end of the rod 17 emerges axially the pin 19 which can move inwards and which relies precisely

  on the intermediate branch 11 of the profile 9 in "U" and.

  1 sequent by acting on this pin 19, it will cause the blocking or unlocking of the cylinder 18 and thus the locking or unlocking of the seat back to allow the pivoting of the seat.

  In this way, when acting on the pusher 1 and the axis 3 moves vertically downward, it is also obtained the downward movement of the axis 7, which being supported in the notches 14 of the profile 9 will produce the tilting of the latter around the axis 13, tilting which gives rise to a thrust on the pin 19 which penetrating in the interior under the effect of this thrust, cause the release of the pneumatic cylinder 18 and, as stated above, will allow the pivoting of the backrest with a simple touch

  from the passenger's back seated in the seat.

  Finally, when one stops acting on the pusher 15 1, the profile 9 resumes its rest position and the pin 19 protrudes outside and therefore causes the locking of the pneumatic cylinder 18 which gives rise to the immobilization of the file. FIG. 1 also shows the device 20 or the mechanism which makes it possible to move the seat of the vehicle transversely, which device is also constituted by one night 1 'mounted on the armrest 2 and from which emerges an axis 3 guided in the corresponding orifices-5 'and 6' provided for this purpose in the support 4 of the preceding mechanism, the latter 25 being anchored inside the armrest 2.du seat as it

has been said above.

  The axis 3 'emerges below the constituent body of the support 4 so that this lower end of the axis 3' rests on a rod or a lever 20 by means of which is made precisely the unlocking means tending to constantly immobilize the seat, so that when this mechanism

  is blocked, the seat can move transversely.

  This lever or rod 20 is associated with a spring

  which holds the mechanism in the blocking position, which lock is obtained by means of a claw or similar element

  1 related to the rod or lever 20 in question, although these elements have not been represented because they are known and conventional type. The blockage in question will be carried out on a slide provided on the anchor support 4 of the seat on the vehicle floor. In accordance with this construction, the rod or lever 20 will always be biased upward due to the action of the spring not shown and, therefore, the movement of the seat or chair in the transverse direction will be blocked. However, by acting on the pusher 1a, it will cause a downward movement of the axis 3 'whose lower end resting on the rod or the lever 20, push the latter downwards by overcoming the resistance of the spring mentioned above and which kept locked, by means of the claw in ques15 tion, the slide provided in the anchoring support of the chair or seat on the vehicle floor. That is, the downward movement of the rod or lever 20 gives rise to the

  release of the scratch relative to the slide provided in the anchoring bracket, which allows for the displacement 20 in the transverse direction of the chair or seat in question.

  Figures 3 and 4 show the pivoting device of the support arm 2, this device being constituted by means of a fixed axis 21 to be fixed on the vehicle seat. This pin 21 has at its free end, a square-shaped squeegee 22 for the rigid connection to this axis of a cam 23, so that this cam is immobilized just as

the axis in question 21.

  On this sector of square form are mounted a series of sockets 24 which allow the free rotation on this axis of the armature of the support arm 2, as well as an immobilizing plate 25. The armature in question of the armrest 2 is constituted by two parallel flat bars 26 between which is located the cam in question 23, and a spring 27 which connects the immobilizing plate 25 to a ratchet 28, also interposed between the flat bars 26 of the armature, and 1 which is located in front of the cam 23, this ratchet 28 having the posibility of tilting on itself inside the arm 2, ain

  if only to be trained by the latter during his movements using a tilting axis 29.

  The spring 27 is a helical spring and is mounted on one of the sockets 24 which constitute the rotatable support of the immobilizing plate 25, this spring being fixed at one of its ends to this immobilizing plate. in the perforation 30 made for this purpose, while the other side of the spring 27 is attached to a lateral pin 31 located at the free end of the ratchet 28 opposite its bottom axis

29.

  To return to the cam 23, the latter has, in the active sector of its edge a flat sector 32, and an intermediate step 33 and a step 34 opposite the flat sector 32. For its part, the ratchet 28 comprises, the end in question opposite the tilt axis 29, a sharp angle 35 of locking on the step 33 or on the step 35 of lacame 23, this ratchet 28 being provided on its inner edge and at the height of its axis tilting 29, a flat sector 36 which can mate with the flat sector 32 'of the cam 23 in a determined position. The ratchet 28 in question also has a locking claw 37 in a bent tooth 38 provided at the end.

  free of a radial extension 39 which corresponds to the immobilization plate 25.

  This immobilizing plate 25 further comprises> on its edge a step 40, while the cam 23 has a stud 31 which collaborates with the step 40, as explained below. As has been said, from the intermediate and stable position of the armrest 2, in which the latter really acts as an armrest and in which the ratchet 28 has its end 35 locked on the step 33 of the cam, thereby preventing the armrest 2 from pivoting downwards because this cam is fixed, the arm 2 can swing freely upwardly and therefore the ratchet 28 gliss 1 will be on the edge of the cam, being held permanently in contact with the latter by the spring 27, until reaching a limit position in which the straight edges of these elements come into mutual contact, position in which the ratchet 28 has tilted sufficiently so that its claw 37 is located inside the bent tooth 38 of the immobilizing plate 25, giving rise to locking

between the ratchet and the plate.

  From this position of maximum elevation of the armrest 2, the latter can freely swing downwards by driving with it the ratchet 28 which is held immobilized in the direction of tilting on its own axis 29, under the effect of the immobilizing plate 25 which accompanies this ratchet during its planetary movement, because it is mounted with the possibility of turning on the axis 21, and because it is connected to this ratchet by the spring 27 that tends

to bring these two pieces together. This situation is maintained until the end 35 of the ratchet 28

  exceeds the step 33 of the cam 23, and mediately after the step 40 of the immobilizing plate 25 will bear on the pin 41 of this cam, so that the rotational movement of the immobilizing plate 25 will be limited and that the plate will be retained, while the arm and, therefore, the ratchet will continue to descend and the claw 37 25 out of the bent tooth 38, thus giving rise to the release of the ratchet 28 and its tilting against the periphery of the cam under the effect of the spring 27 to the limit descent position in which the end 35 of this ratchet is based

on the final step 34 of the cam.

  From this position, it is clearly visible that a new rotation of the arm 2 upwards will cause the ratchet 28 to slide on the edge of the cam until it reaches the step 33, at which point again the blocking of this arm 2 in the normal position of use as a true armrest, and if it is desired to tilt the armrest down again, it will be necessary to raise it up to the upper limit position in which the ratchet 28 will again be blocked by the immobilizing plate 25. These three positions or situations in which the armrest 2 can be placed will be clearly indicated to the user by the shock of the ratchet 28 against the corresponding edge of the cam 23, both when the ratchet is released from the immobilizing plate 25 and when the ratchet reaches the step 33 of the cam. Of course, various modifications can be made by those skilled in the art to devices or methods that

  have just been described by way of non-limiting example without departing from the scope of the invention.

R E V E N D I C AT ION S

  1) Device for adjusting the position of vehicle seats, particularly applicable to passenger vehicle seats, in which the folding mechanism of the backrest is constituted by a pneumatic cylinder which is provided, at the free end of its rod, with a nipple which, when it receives an axial pressure, releases the cylinder in question to allow the adjustment of the position of the backrest, the entire mechanism being controlled by pushers located in an accessible zone, preferably on the support arm of the chair or seat, the seats in question being able to move transversely on guides located for this purpose and associated with a locking rod which can tilt overcoming the tension of a spring which tends to make one or more claws blocking devices selectively enter a slideway provided in the seat-anchorage support on the vehicle floor, characterized in that inside the armrest (2) in question is attached a body of generally prismatic shape (4) which serves as a support, and which is provided at its upper part and at its lower part with orifices (5, 6) in which is located a vertical axis (3). ) whose upper part is secured to the control pushbutton (1) that axis (3) can move upwardly and downwardly when acting on this pusher (1), while a pivot (7) guided in elongated holes (8) formed for this purpose in the support (4) protrudes radially from this axis, it being provided that this pivot (7) is in turn supported on curvilinear cuts (14). the corresponding edges of the side branches (10) of a profile (9) of generally "U" shape articulated so as to be able to tilt inside the support (4) proper; with the particularity that the intermediate branch (11) of this profile (9) in "U" is pressed against the end of the pin (19) which emerges from the rod (17) of the pneumatic cylinder (18) , all so that the actuation of the pusher (1) -and, consequently, the downward displacement of the axis (3) integral with the latter, cause the radial pivot of this axis to exert pressure on the "U" profile (3) to tilt it and, therefore, push the pin (19) axially inwards thereby unlocking the pneumatic cylinder (18); the rod of this jack (17) being further connected to the general support with the possibility of turning

  freely with respect to the latter, thanks to an axis of articulation of the part which connects the two parts.

  2) Device for adjusting the position of vehicle seats, according to claim 1, characterized in that, on the support (4) constituted by the prismatic body and which is located inside the support arm (2), is disposed a second vertical axis (3 ') which has the possibility of moving upwards and downwards, the upper part of this axis 20 being integral with a control pushbutton (1') located on the armrest (2) near the preceding pusher (1); provided that the movable axis (3 ') in question passes through orifices (5', 6 ') formed for this purpose in the corresponding lower and upper parts of the support (4); with the particularity that the lower end of the axis in question is based on the rod or the lever (20) corresponding to locking the seat in the transverse direction, so that the manual thrust exerted on the pusher (1 ') is transmitted to the axis (3') and, consequently, to the rod or lever (20) in question by overcoming the resistance of a spring, in a well-known manner, and by producing the unlocking mechanism that

kept the seat immobilized.

  3) Device for adjusting the position of vehicle seats, according to claim 1, characterized in that the armrest (2) of the seat can be folded down by means of a mechanism constituted by a fixed axis (21) intended to be fixed to the frame of the seat, and on which are mounted, so as to rotate freely, the frame of the armrest and a locking plate (25), and a cam (23) fixed rigidly on the fixed axis in question, cam with which collaborates a ratchet (28) mounted in turn so as to rotate freely on the frame of the armrest; being provided that the ratchet is permanently maintained in contact with the periphery of the cam by means of a helical spring (27) mounted coaxially on the axis and which, at its other end, is fixed on the immobilizing plate (25), the latter tending to adopt at any time a position 15 maximum approach relative to the ratchet, and with the feature that the cam in question is provided with a step in which the end recesses

  bent of the ratchet in the horizontal position of the support arm, position from which the armrest in question can swing freely upwards.

  Vehicle seat position adjusting device according to claim 3, characterized in that, in correspondence with the position of maximum lift of the armrest (2), is formed on the fixed cam (21) a flat sector disposed radially and which, in this position, fits another flat sector of the ratchet, by determining a position thereof in which a lateral locking claw (37) formed at the opposite end to that which in the previous position was resting on the step of the cam, is located below a bent tooth (38) formed at the free end of a radial extension of the immobilizing plate, so that, under the effect of the spring which tends to bring these two elements together, the locking plate (25) in question blocks the ratchet (28) preventing its tilting, this situation being maintained during the folding of the support down, until it exceeds just the horizontal stable position; it being provided that immediately after the stop block (40) of the cam (23) corresponding to this horizontal position, this cam is provided with a pin (41) facing the immobilizing plate (25) being formed on the edge of the latter a step which, by relying on the pin in question, causes the limitation of the rotation of the immobilization plate, driven by the arm by means of a spring which connects it to the ratchet (28), this immobilization plate giving rise, in turn, to an angular displacement between the plate and the ratchet, which causes the release of the latter in the direction of tilting as well as its subsequent adaptation to the edge of the cam beyond the step that corresponds to the horizontal position of the arm, to allow movement of the arm down to another limit position in which the angular end of the ratchet is supported on a second step of the cam in 20 question, limit position to by from which the support arm (2) can swing freely upwards, until the ratchet protrudes above the upper step and locks on the latter in the horizontal position of

  the armrest, thus completing the work cycle of the device.

   ) Device for adjusting the position of vehicle seats, according to claims 3 and 4,

  characterized in that the end of the fixed axis which receives the mechanisms in question presents. a square shape or similar for the irremovable fastening of the cam, with the particularity that the latter is located inside the armature of the arm, the latter being constituted, for this purpose, by two flat bars parallel between which are the ratchet (28), 35

  the immobilizing plate (25) and the helical spring.

  (27), the flat bars of the armature and the immobilizing plate being rotatably mounted on the fixed axis and with sockets (24) installed on the square portion thereof. axis.