SLIDING DEVICE FOR A VEHICLE SEAT PROVIDED WITH AN IMPROVED RELEASING ASSEMBLY

Abstract

The present invention relates to a sliding device for a vehicle seat provided with an improved releasing assembly. Said sliding device comprises a pair of locking assemblies (1a, 1b), one for each track of the sliding device, each including a plurality of locking pins (3a, 3b) suitable for locking the upper rails of the tracks to the respective lower rails. Said sliding device further includes a releasing assembly for driving said locking pins to an unlocking configuration for adjusting the position of the vehicle seat. According to the invention, such releasing assembly (50) comprises a releasing member (9) comprising a pair of substantially parallel arms (9a, 9b) pivotally connected to respective tracks, a crossbar (13) extending transversely to said tracks and provided at each end with an engaging assembly for engaging the locking pins (3a, 3b) of the respective locking assembly (1a, 1b) and a pair of connecting members (11a, 11b), which are configured to convert a rotational movement of the end portion of said releasing member arms into a translational movement of the crossbar.

Claims

1. A sliding device for a vehicle seat, comprising a pair of parallel tracks, each comprising a lower rail and an upper rail, each of the upper rails being constrained to a respective lower rail, but slidable relative to the lower rail, the upper rails and the lower rails having respective longitudinal axes, wherein the lower rails are provided with a plurality of apertures arranged along the longitudinal axes of the lower rails, wherein the sliding device is provided with a locking arrangement including two locking assemblies, one for each of the tracks, wherein each of the locking assemblies comprises one or more locking pins, which are configured to penetrate into corresponding apertures of the respective lower rail, wherein the locking arrangement further comprises a releasing assembly for moving the locking pins from a locking configuration to an unlocking configuration, wherein the releasing assembly comprises: a releasing member comprising a pair of substantially parallel arms, each of which is pivotally connected to a respective track; a crossbar extending transversely to the tracks and provided at each opposite end with an engaging assembly for engaging the locking pins of a respective one of the locking assemblies; and a pair of connecting members, one for each of the tracks, each of the connecting members being configured to convert a rotational movement of the end portion of a respective releasing member arm into a translational movement of the crossbar, preferably into a vertically oriented translational movement of the crossbar.

2. The sliding device according to claim 1, wherein the releasing member is made as a U-shaped releasing handle or towel bar and comprises a middle, transverse portion joining the releasing member arms.

3. The sliding device according to claim 1, wherein each of the tracks is provided with a mounting support, which is fastened to the respective upper rail and to which both a respective releasing member arm and a respective connecting member are pivotally connected.

4. The sliding device according to claim 3, wherein a releasing member plate is pivotally connected to each of the mounting supports and the end portion of a respective releasing member arm is constrained to the releasing member plate.

5. The sliding device according to claim 4, wherein each of the releasing member plates is provided with a hooked tab which is received in a window provided in the respective mounting support for limiting the pivoting range of the releasing member arms relative to the mounting supports.

6. The sliding device according to claim 4, wherein each of the releasing member plates includes a driving surface and each of the connecting members correspondingly has a driven surface which is in a force transmission connection with the driving surface of the respective releasing member plate.

7. The sliding device according to claim 6, wherein each connecting member is pivotally connected to a respective mounting support by means of a pivot pin and wherein each connecting member comprises, on a first side of the pivot pin, a connecting member bracket including the driven surface, and, on a second, opposite side of the pivot pin, a crossbar engaging portion, which is provided with an elongated slot through which the crossbar passes.

8. The sliding device according to claim 6, wherein each connecting member is pivotally connected to a respective mounting support by means of a pivot pin and wherein each connecting member is made as a rocker, with a first rocker arm, arranged on a first side of the pivot pin and carrying a connecting member bracket including the driven surface, and a second rocker arm, arranged on a second, opposite side of the pivot pin and connected to a push rod which is provided with a through-hole through which the crossbar passes.

9. The sliding device according to claim 1, wherein each of the engaging assemblies includes a yoke fastened to a respective end of the crossbar, a stud arranged between opposite ends of the joke and a U-shaped engaging plate connected to the stud and configured to engage the locking pins of a respective locking assembly.

10. The sliding device according to claim 9, wherein each of the engaging plates is provided with a window, through which the locking pins are configured to pass, wherein each of the locking pins is provided with at least one transversely projecting peg, and wherein the width of the window is larger than the width of the locking pins, but smaller than the sum of the width of the locking pins and of the length of the transversely projecting pegs, the transversely projecting pegs being arranged on the body of the locking pins so that they are substantially in abutment against the engaging plate when the locking pins are completely inserted in the apertures of the lower rails.

11. The sliding device according to claim 9, wherein a cage block is fixedly fastened to the upper rail of each of the tracks and each engaging plates slides inside the respective cage block, along the walls of a cavity provided in the cage block.

12. The sliding device according to claim 1, wherein the locking pins are biased towards the apertures of the lower rails by means of springs.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Further features and advantages of the invention will become more evident from the detailed description of some preferred embodiments thereof, given by way of non limiting example, with reference to the attached drawing, in which:

[0045] FIG. 1 is a perspective view of a sliding device according to a first embodiment of the invention;

[0046] FIG. 2a is an enlarged view showing a detail of the releasing assembly of the sliding device of FIG. 1 in a first, locking configuration;

[0047] FIG. 2b is an enlarged view showing the detail of the releasing assembly of FIG. 2a in a second, unlocking configuration;

[0048] FIG. 3a is an enlarged view showing one of the locking assemblies of the sliding device of FIG. 1 in a first, locking configuration;

[0049] FIG. 3b is an enlarged view showing the locking assembly of FIG. 3a in a second, unlocking configuration;

[0050] FIG. 4 is a perspective view of a sliding device according to a second embodiment of the invention;

[0051] FIG. 5a is an enlarged view showing a detail of the releasing assembly of the sliding device of FIG. 4 in a first, locking configuration;

[0052] FIG. 5b is an enlarged view showing the detail of the releasing assembly of FIG. 5a in in a second, unlocking configuration.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

[0053] With reference to FIG. 1, a sliding device 10 according to a first preferred embodiment the invention is shown.

[0054] In a per se known manner, the sliding device 10 comprises a pair of parallel tracks 20a, 20b, each comprising a lower rail 30a, 30b, intended to be attached to the vehicle floor, and an upper rail 40a, 40b, intended to be attached to the frame of a vehicle seat. Each upper rail 40a, 40b is constrained to the respective lower rail 30a, 30b, but can slide relative to said lower rail.

[0055] In order to selectively allow/prevent a sliding movement of the upper rails relative to the lower rails of the tracks 20a, 20b, a locking arrangement is provided. Said locking arrangement comprises two locking assemblies, one for each tracks 20a, 20b.

[0056] As will be shown below, each locking assembly comprises one or more locking pins, bound to the respective upper rail and configured to penetrate into apertures provided in the respective lower rail for locking the upper rails to the lower rails and preventing any movements of said upper rails relative to said lower rails.

[0057] In order to allow a user to adjust the position of the seat relative to the vehicle floor, the locking arrangement of the sliding device according to the invention also comprises a releasing assembly 50 for moving the locking pins from the aforesaid locking configuration to an unlocking position, in which all the locking pins are extracted from the apertures of the respective lower rail, thus allowing the upper rails to slide relative to the lower rails.

[0058] In general, the releasing assembly comprises a releasing member 9 and a pair of connecting members 11a, 11b, one for each locking assembly, each connecting member being in a force transmission connection with the releasing member 9, on one hand, and with the locking pins of the respective locking assembly, on the other hand.

[0059] According to the invention, the releasing assembly 50 comprises: [0060] a releasing member 9 comprising a pair of substantially parallel arms 9a, 9b, each of said arms being pivotally connected to a respective track 20a, 20b; [0061] a crossbar 13 extending transversely to the tracks 20a, 20b of the sliding device and provided at each end with an engaging assembly for engaging the locking pins of the respective locking assembly; and [0062] a pair of connecting members 11a, 11b, one for each track 20a, 20b of the sliding device, each of said connecting members being configured to convert a rotational movement of the end portion of the respective arm of the releasing member into a translational movement of the crossbar.

[0063] In the shown embodiment, the releasing member is made as a U-shaped releasing handle or towel bar 9 and comprises a middle gripping portion 9c joining the substantially parallel arms 9a, 9b.

[0064] One of the connecting members of the releasing assembly of the sliding device according to the first preferred embodiment of the invention is shown in greater detail in FIGS. 2a, 2b and the corresponding locking assembly is shown in greater detail in FIGS. 3a, 3b. It is to be intended that the other connecting member and the other locking assembly are, respectively, identical to the ones shown in FIGS. 2a, 2b and 3a, 3b.

[0065] As shown in FIGS. 2a, 2b, for each track of the sliding device the releasing assembly 50 is provided with a mounting support 15a, 15b which is fastened to the respective upper rail 40a, 40b and to which both the releasing member arm 9a,9b and the connecting member 11a, 11b are pivotally connected.

[0066] In the shown embodiment, the mounting support 15a, 15b includes a fastening portion 15a, 15b for the connection to the upper rail, which fastening portion is substantially parallel to the upper surface of the upper rail and lies on said upper surface of the upper rail. The mounting support further comprises a first and second wings 15a, 15b and 15a, 15b, respectively, which extend from the fastening portion 15a, 15b along a side surface (preferably the inner side surface, as shown in the Figures) of said upper rail. The releasing member arm 9a,9b and the connecting member 11a, 11b are pivotally connected to the mounting support 15a, 15b at said first and second wings 15a, 15b and 15a, 15b, respectively.

[0067] For pivotally connecting the releasing member arm to the mounting support, a releasing member plate 17a, 17b is pivotally connected to the mounting support 15a, 15b by means of a first pivot pin 19a, 19b and the end portion of the releasing member arm 9a, 9b is constrained to the releasing member plate 17a, 17b by a pair of bent tabs 21a, 21b engaging on either sides a flattened section 9a, 9b of the end portion of the releasing member arm 9a, 9b.

[0068] The range of pivoting of the releasing member plate 17a, 17b about the first pivot pin 19a, 19b is restrained by a hooked tab 23a, 23b which is received in a window 25a, 25b provided in the mounting support 15a, 15b, namely in the first wing 15a, 15b of said mounting support: in a first limit position of the releasing member plate, the hooked tab 23a, 23b abuts against a first edge of the window 25a, 25b (see FIG. 2a), while in a second limit position of the releasing member plate, the hooked tab 23a, 23b abuts against a second, opposite edge of the window 25a, 25b (see FIG. 2b). Therefore, the size of the window 25a, 25b determines the pivoting range of the releasing member plate 17a, 17b about the first pivot pin 19a, 19b.

[0069] The releasing member plate 17a, 17b further includes a driving surface 27a, 27b for establishing a force transmission connection between the releasing member arm 9a, 9b and the respective connecting member 11a, 11b.

[0070] Such connecting member 11a, 11b is pivotally connected to the mounting support 15a, 15b, namely to the second wing 15a, 15b of said mounting support, by means of a second pivot pin 29a, 29b.

[0071] The connecting member 11a, 11b includes a connecting member bracket 31a, 31b, intended to be in contact with driving surface 27a, 27b of the releasing member plate 17a, 17b and offering a driven surface for said driving surface 27a, 27b.

[0072] It will be evident to the person skilled in the art that the profiles of the driving surface 27a, 27b of the releasing member plate 17a, 17b and of the connecting member bracket 31a, 31b of the connecting member can be adequately chosen for obtaining the desired force transmission connection between the releasing member and the connecting member.

[0073] On the side of the second pivot pin opposite to the connecting member bracket 31a, 31b, the connecting member 11a, 11b is provided with a crossbar engaging portion 33a, 33b, which is provided with an elongated slot 35a, 35b through which the crossbar 13 passes.

[0074] Thanks to the provision of the elongated slot 35a, 35b, upon rotation of the connecting member 11a, 11b about the second pivot pin 29a, 29b, the crossbar 13 is driven along the walls of said elongated slot so that it moves along a substantially linear path, namely along to a vertically oriented linear path.

[0075] The end 13a, 13b of the crossbar 13 is provided with an engaging assembly for engaging the respective locking assembly and establishing a force transmission connection between the releasing member 11a, 11b and said locking assembly.

[0076] As shown in FIGS. 3a, 3b, each locking assembly 1a, 1b comprises one or more locking pins 3a, 3b (four in the shown embodiment), which are configured to pass through apertures 42a, 42b provided in the respective upper rail 40a, 40b and penetrate into apertures 32a, 32b provided in the respective lower rail 30a, 30b for locking the upper rails to the lower rails and preventing any movements of said upper rails relative to said lower rails.

[0077] In the shown embodiment, the locking pins 3a, 3b of the locking assembly and the apertures 32a, 32b of the lower rails are arranged so that, at any position of the upper rails relative to the lower rails, all the locking pins penetrate into respective apertures of the lower rail.

[0078] To this purpose, at least one locking pin (so-called master pin) is provided with a rounded tip 4a, 4b and the webs 34a, 34b between adjacent apertures of lower rail are correspondingly provided with a convex profile in the direction of the longitudinal axis of the lower rail. Furthermore, the apertures 32a, 32b are preferably provided with chamfered edges.

[0079] However, in alternative embodiments of the invention, the locking pins of the locking assembly and the apertures of the lower rail could be arranged so that, for any position of the upper rails relative to the lower rails, at least one locking pinand preferably two locking pinsis aligned to a corresponding aperture of the respective lower rail and penetrate therethrough. A similar arrangement of the locking pins of the locking assembly and of the apertures of the lower rail is disclosed, for instance, in US 2003/006355.

[0080] The locking pins 3a, 3b are biased to their locking configuration, in which they penetrate into corresponding apertures of the respective lower rail. To this purpose, a helical spring 5a, 5b is wound around the body of each locking pin 3a, 3b and the upper ends of the helical springs 5a, 5b abut against the edge of corresponding apertures 42a, 42b of the upper rails, thus biasing such locking pins downwards, towards the apertures 32a, 32b of the lower rails.

[0081] The crossbar 13 is configured to move along a substantially linear path and to accordingly drive the locking pins 3a, 3b along a substantially linear path for moving such locking pins from their locking configuration to their unlocking configuration.

[0082] To this purpose, the end 13a, 13b of the crossbar 13 is provided with an engaging assembly comprising a yoke 37a, 37b, a stud 39a, 39b arranged between opposite ends of the joke 37a, 37b and a U shaped engaging plate 41a, 41b arranged between the respective upper and lower rails and provided with a window through which the locking pins 3a, 3b are configured to pass.

[0083] In detail, the engaging plate 41a, 41b comprises a middle portion 41a, 41b provided with the window through which the locking pins are configured to pass and two upwardly extending legs 41a, 41b which pass through corresponding holes 44a, 44b provided in the upper rail and are connected to the stud 39a, 39b.

[0084] In order to allow the locking pins 3a, 3b to be driven by engaging plate 41a, 41b, such locking pins are provided with transversely projecting pegs 7a, 7b. Preferably, each locking pin 3a, 3b is provided with two diametrically opposed transversely projecting pegs 7a, 7b.

[0085] Said transversely projecting pegs 7a, 7b are arranged on the body of the locking pins 3a, 3b so that they are substantially in abutment against the engaging plate 41a, 41b when said locking pins are completely inserted in the apertures 32a, 32b of the lower rails 30a, 30b (locking configuration, see FIG. 3a).

[0086] Correspondingly the window of the engaging plate 41a, 41b is designed so that its width is larger than the width of the locking pins 3a, 3b, but smaller than the sum of the width of said locking pins and of the length of the transversely projecting pegs 7a, 7b, so that the edge of this window can engage the transversely projecting pegs 7a, 7b and lifting the locking pins 3a, 3b until they become disengaged from the apertures 32a, 32b of the lower rails 30a, 30b.

[0087] As can be seen in the Figures, in order to enhance the stiffness of the construction, a cage block 43a, 43b is fixedly fastened to the upper rail 40a, 40b and the engaging plate 41a, 41b slides inside said cage block, along the walls 45a, 45b of a cavity provided to this purpose in the cage block.

[0088] Thanks to such a rigid construction, it can be guaranteed that the locking pins can be properly driven along a substantially rectilinear path.

[0089] The operation of the locking arrangement of the sliding device according to the invention can be summarized as follows.

[0090] In a rest condition, the springs 5a, 5b bias the locking pins 3a, 3b of the locking assemblies 1a, 1b towards the apertures 32a, 32b of the lower rails 30a, 30b and said locking pins penetrate into corresponding apertures of the respective lower rail. In such a locking configuration, the upper rails 40a, 40b cannot slide relative to the lower rails 30a, 30b.

[0091] When a user wishes to adjust the position of the vehicle seat relative to the vehicle floor, he/she pulls the middle portion 9c of the releasing member 9 upwardly. As a result, the end portions of the releasing member arms 9a, 9b pivot in a clockwise direction (see arrow F1 in FIG. 2b) about the first pivot pin and the driving surfaces 27a, 27b of the releasing member plates 17a, 17b act upon the driven surfaces of the connecting member brackets 31a, 31b of the connecting members 11a, 11b, thus causing a rotation in a counterclockwise direction of said connecting members 11a, 11b about the second pivot pin (see arrow F2 in FIG. 2b). Upon rotation of the connecting members, the crossbar 13 moves upwards (see arrow F3 in FIG. 2b) sliding along the elongates slots 35a, 35b of said connecting members.

[0092] As the crossbar 13 moves upwards, the engaging plates 41, 41b are pulled upwards (see arrow F4 in FIG. 3b).

[0093] As the engaging plates 41a, 41b move upwards, the edges of the windows of said engaging plates engages the transversely projecting pegs 7a, 7b of the locking pins 3a, 3b and, by overcoming the elastic resistance of the springs 5a, 5b, push upwards said locking pins 3a, 3b along a substantially linear path until they become disengaged from the apertures 32a, 32b of the respective lower rail 30a, 30b.

[0094] In such an unlocking configuration, the upper rails 40a, 40b can slide relative to the lower rails 30a, 30b and the position of the vehicle seat can be adjusted.

[0095] When the user releases the releasing member 9, the springs 5a, 5b biases the locking pins 3a, 3b back towards the apertures of the respective lower rail 30a, 30b, and said locking pins penetrate into corresponding apertures of said lower rail, thus blocking the upper rail relative to the lower rail in a new, desired position.

[0096] As a result, the crossbar 13 moves downwards back to its starting position and makes the connecting members 11a, 11b rotate in a clockwise direction back to their initial position. The rotation of the connecting members 11a, 11b entails a rotation of the releasing member arms in a counterclockwise direction, so that the releasing member 9, too, is brought back to its initial position.

[0097] Referring now to FIGS. 4, 5a and 5b, a second embodiment of the invention is schematically shown.

[0098] The construction of the sliding device and of its releasing assembly according to this second embodiment is similar to the one of the previously described embodiment and parts having the same structure and/or function are denoted by the same numerals used in FIGS. 1, 2a and 2b.

[0099] The second embodiment differs from the first embodiment in the structure of the connection between the connecting members 11a, 11b and the crossbar 13.

[0100] As clearly visible in FIGS. 5a and 5b, each connecting member 11a, 11b is made as rocker, with first and second rocker arms on opposite sides of the second pivot pin 29a, 29b.

[0101] A first rocker arm 47a, 47b carries the connecting member bracket 31a, 31b, which is in force transmission connection with the releasing member plate 17a, 17b, while the second rocker arm 49a, 49b is connected, by means of a pin 51a, 51b, to a push rod 53a, 53b. The push rod 53a, 53b is provided with a through-hole 55a, 55b through which the crossbar 13 passes.

[0102] It will be evident to the person skilled in the art that also according to the structure of this second embodiment of the invention, upon rotation of the connecting members 11a, 11b about the second pivot pin 29a, 29b, the crossbar 13 will move along a linear path, namely a vertically oriented linear path.

[0103] It will be also evident to the person skilled in the art that the above description of preferred embodiments of the invention has been given merely by way of example and several variants and modifications within the reach of the person skilled in the art can be envisaged, without departing form the scope of the invention as defined by the appended claims.