System for locking continuously adjustable slide rail

Abstract

The invention relates to a system (1) for locking a continuously adjustable slide rail for a vehicle seat, comprising:-a slide rail (2) comprising a first lower slide element (20) configured to be fixed to the floor of the vehicle and a second upper slide element (21) configured to slide along the first slide element,-a system for locking by support, comprising:-a guide rail (3), -a first sliding element (21) extending longitudinally along said at least one slide rail, stationary relative to the first sliding element,-a first blocking member (4) and a second blocking member (5) mounted integrally with the second sliding element (21), located in a position offset along the longitudinal axis of the guide rail (3), the first blocking member (4) being configured to rest against the guide rail under the action of two wedge-shaped members (OC1, OC2), the second blocking member (5) being configured to stop against the guide rail under the action of the wedge-shaped members (OC1, OC2); the wedge members (OC1, OC2) are blocked by the wedge effect in the grooves (FE1, FE2).

Description

[0001] The invention relates to a system for locking a slide rail of a continuously adjustable vehicle seat, and to a vehicle seat comprising such a locking system. Technical Field

[0002] The present invention relates to the field of systems for adjusting and locking sliding rails of motor vehicles. More specifically, the invention relates to adjustment systems whose sliding rails connect the seat cushion of a seat to the vehicle floor.

[0003] In the present invention, and in a known manner, a vehicle seat may generally comprise:

[0004] a seat cushion extending in the X direction from a front edge to a rear edge and extending transversely in the Y direction from a first side edge to a second side edge,

[0005] - a backrest extending in height from the rear edge of the cushion in a Z direction, which is vertical or generally inclined rearward, from the lower edge to the upper edge of the backrest, and extending transversely in a Y direction, from the first side edge to the second side edge.

[0006] The backrest is tiltable relative to the seat cushion, typically via a pivot axis between the backrest frame and the seat cushion frame, which pivot axis extends in the transverse direction Y.

[0007] The position of the seat in the vehicle can generally be adjusted along direction X with the adjustment and locking system according to the invention, or even preferably with two adjustment and locking systems, wherein two slide rails connect the seat cushion to the floor of the vehicle.

[0008] Thus, the two or each slide rail comprises two sliding elements, wherein a first sliding element is rigidly connected to the floor, typically the lower profile, and a second sliding element is rigidly connected to the seat cushion of the seat, typically the upper profile, the two sliding elements being configured to slide relative to each other along direction X.

[0009] The adjustment and locking system also includes a locking system comprising a control member which is typically commanded manually or motorized to unlock the slide rails so as to allow an occupant of the seat to adjust the position of the seat by moving a first sliding element which is movable relative to the second sliding element.

[0010] Once the position of the seat has been adjusted, the control member is released to lock the seat in the adjustment position corresponding to the adjustment step of the slide rail.

[0011] To this end, a locking system with discontinuous adjustment is known in the prior art. The locking system comprises a support rigidly connected to the second sliding element, and a blocking member movable relative to the support. The blocking member is configured to penetrate an adjustment opening integrally formed with the first sliding element under the action of elastic means, such as a spring, in the locked state of the locking system. When actuated, a control member pushes the blocking member against the force of the spring, thereby withdrawing the blocking member from the adjustment opening and releasing the slide rail, allowing it to slide.

[0012] Thus, a first family of locking systems is known, generally referred to by those skilled in the art as “step locks”, with which blocking members, generally rigidly connected to one another, ensure blocking of the slide only when the relative position between the two sliding elements (a first sliding element and a second sliding element) corresponds to an adjustment step of the slide.

[0013] A second family of locking systems is also known, which has an improved security compared to the first family of locking systems and is generally referred to by those skilled in the art as "instant locking", which again ensures that the two elements of the slide are blocked even when the position between the two sliding elements (first sliding element and second sliding element) is in any intermediate position between the two continuously adjusted positions.

[0014] To this end, the blocking members are independent of each other and are configured so that at least one member penetrates and is fixed in one of the adjustment openings, which are generally oval, even when the slide rail is in any intermediate position between two adjustment steps, i.e. two consecutive adjustment positions of the slide rail.

[0015] The slide rail can then no longer slide beyond the travel corresponding to the adjustment steps of the slide rail. When the slide rail moves to either of the two consecutive adjustment positions, a slight sliding movement of the first sliding element relative to the second sliding element allows the remaining unpenetrated blocking member to face the adjustment opening and be locked therein, thus locking the slide rail. In both cases, whether a locking system of the step lock type or the instant lock type, the number of adjustment positions is limited to the number of locking positions permitted by the system's adjustment steps.

[0016] However, the present invention relates to a locking slide system with continuous adjustment, ie a system which provides an infinite number of adjustment positions over the length of the slide, and in contrast to the aforementioned adjustment and locking systems which have discrete adjustment capabilities. Background Art

[0017] Continuously adjustable locking systems for motor vehicle seats are known from the prior art, in particular from documents US 2003 / 0227207, DE 2 301 042 or US Pat. No. 2,292,718.

[0018] Such a system includes a guide rail rigidly connected to a first fixed portion of a slide rail, the first fixed portion of the slide rail rigidly connected to the floor of the vehicle, and a pair of blocking members including a first blocking member and a second blocking member rigidly connected to a second movable portion of the slide rail, the second movable portion rigidly connected to the seat cushion frame of the seat.

[0019] In a first relative position between the first blocking member and the second blocking member, corresponding to unlocking of the system, the first and second locking members are configured to freely move along the guide rail without obstruction, thereby allowing the slide rail to slide freely.

[0020] In the second relative position between the first blocking member and the second blocking member, they come into contact with the guide rail in the following supporting condition, resulting in:

[0021] - a first force generated by the first abutment of the second sliding part against the first blocking member, ensuring overcentering of the first locking element on the guide rail, thereby ensuring blocking of the second sliding element relative to the first sliding element in the first sliding direction by two reaction effects of the guide rail on the first blocking member, a first reaction effect between the first upper friction surface of the guide rail and the first wall of the first friction member, on the one hand, and a second reaction effect between the second lower friction surface of the guide rail and the second wall of the first blocking member,

[0022] a second force generated by a second abutment on the second blocking member, which ensures the overcentering of the second blocking member on the guide rail, thereby ensuring the locking of the second sliding element relative to the first sliding element in the second sliding direction by two reaction actions of the guide rail on the second blocking member, a third reaction action between the first upper friction surface of the guide rail and the third wall of the second friction member, on the one hand, and a fourth reaction action between the second lower friction surface of the guide rail and the fourth wall of the second blocking member,

[0023] With these prior art devices, there may be problems with micro-movements of the slide rails, caused by stresses on the seat and therefore on the movable part of the slide rails, specifically stresses in alternating directions, which typically occur due to continuous acceleration and deceleration of the vehicle.

[0024] According to the inventor's research, especially when unidirectional stress is applied to the second movable part of the slide rail, a very small movement will be generated between the second movable part of the slide rail and the first fixed part, thereby strengthening the force of one of the abutments, i.e., the first abutment or the second abutment, depending on the direction of displacement, and by destroying the support condition of the blocking member that loses the abutment (i.e., the first blocking member or the second blocking member), resulting in the loss of the other abutment, i.e., the second abutment (or the first abutment).

[0025] As the blocking member loses its abutment, its static equilibrium is no longer guaranteed and the locking member deflects by several hundredths of a millimeter until it reaches an indeterminate static equilibrium position. According to the inventors, this phenomenon can lead to micro-motions due to longitudinal stresses in alternating directions, such as might be encountered during continuous acceleration and deceleration of a vehicle.

[0026] Furthermore, in this prior art, the slide is unlocked by tilting the two blocking members from the second position to the first position, simultaneously losing the abutments, namely the first abutment and the second abutment. As the slide is locked and then unlocked, the first abutment and the second abutment are successively lost each time the slide is unlocked and then regained each time the slide is locked, which can lead to a loss of reference between the blocking members and the second sliding element / rail and, over time, an unsatisfactory over-centering condition due to these dispersions.

[0027] From the document WO2023242497A1 of the present applicant, it is also known that a system for locking a continuously adjustable slide rail comprises:

[0028] - a slide rail comprising a first lower sliding element configured to be attached to a vehicle floor, and a second upper sliding element configured to slide along the first sliding element,

[0029] - Locking system by support, including:

[0030] a guide rail extending in the longitudinal direction of the slide rail, fixed relative to the first sliding element, said guide rail having a first upper friction surface and an opposite second lower friction surface,

[0031] - a first blocking member and a second blocking member, which are rigidly mounted and connected to the second sliding element and whose positions are offset along the longitudinal axis of the guide rail, the first blocking member comprising a first wall and a second wall facing each other and configured to rub against a first friction surface and a second friction surface of the guide rail, respectively, and the second blocking member comprising a third wall and a fourth wall facing each other and configured to rub against the first friction surface and the second friction surface of the guide rail, respectively.

[0032] It is worth noting that the system of locking by support also includes:

[0033] a first cam rigidly connected to the second sliding element, and first elastic means configured to move the first cam to ensure contact with the first locking member, to ensure overcentering of the first blocking member on the guide rail by generating a first force between the first blocking member and the first cam, to ensure blocking of the second sliding element relative to the first sliding element in the first sliding direction by two reactions of the guide rail on the first blocking member, a first reaction between a first upper friction surface of the guide rail and a first wall of the first blocking member, and a second reaction between a second lower friction surface of the guide rail and a second wall of the first blocking member,

[0034] - a second cam rigidly connected to the second sliding element, and second elastic means configured to move the second cam to ensure contact with the first blocking member, ensure support of the second blocking member on the guide rail by generating a first force between the second blocking member and the second cam, ensure locking of the second sliding element relative to the first sliding element in the second sliding direction by two reactions of the guide rail on the second blocking member, on the one hand, a third reaction between the first upper friction surface of the guide rail and the third wall of the second blocking member, and on the other hand, a fourth reaction between the second lower friction surface of the guide rail and the fourth wall of the second blocking member.

[0035] In the supported situation, the first and second cams can cope with micro-movement problems since they respectively operate independently of one another, respectively performing a first compensation of the first blocking member and / or a second compensation of the second blocking member depending on the longitudinal stress and in particular its direction.

[0036] The locking system also includes an unlocking mechanism configured to drive the movement of the first cam and the second cam, move from a position where they are constrained by the first and second elastic devices, thereby ensuring support of the first blocking member and the second blocking member on the guide rail, thereby eliminating support of the first blocking member and the second blocking member on the rail, thereby locking the slide rail, and move to a retracted position of the first cam and the retracted position of the second cam, thereby eliminating support of the first blocking member and the second blocking member on the guide rail, releasing the slide rail so that it can slide.

[0037] According to a preferred embodiment of document WO2023242497, the locking system includes a first spring device located between the second sliding element and the first blocking member, so that the first blocking member is always in contact with the cam element even when the sliding of the slide rail is released in the retracted position of the first cam, and a second spring device located between the second sliding element and the second blocking member, so that the second blocking member is always in contact with the second cam even when the sliding of the slide rail is released in the retracted position of the second cam.

[0038] Traditionally:

[0039] - The X direction runs along the length of the rail and is usually horizontal,

[0040] -Y direction extends in a direction perpendicular to the horizontal X direction,

[0041] - The Z direction extends in the vertical direction.

[0042] The drawings and description of WO2023242497 disclose two embodiments, namely:

[0043] - a first embodiment, wherein the first cam and the second cam are respectively articulated along a horizontal pivot axis, generally in the Y direction,

[0044] A second embodiment, in which the first and second cams are articulated along a vertical pivot axis, ie in the Z direction, ensures a gain in vertical compactness.

[0045] According to the inventors' findings, although the locking system for continuously adjustable vehicle seat slides according to WO2023242497 has advantages in that it can cope with the above-mentioned problems of micro-movements or even support points, it can still be improved in terms of compactness, in particular in the Z direction and / or X direction, in particular with regard to the part of the system that extends above the second sliding element and is locked by the support, typically a convex profile. Summary of the Invention

[0046] The present invention improves this situation.

[0047] A system for locking continuously adjustable slide rails for vehicle seats is proposed, comprising:

[0048] - a slide rail comprising a first lower sliding element configured to be attached to a vehicle floor, and a second upper sliding element configured to slide along the first sliding element,

[0049] - Locking system by support, including:

[0050] a guide rail extending longitudinally along the slide rail and attached relative to the first sliding element, said guide rail having a first upper friction surface and an opposite second lower friction surface,

[0051] a first blocking member and a second blocking member rigidly mounted and connected to the second sliding element, the positions of which are offset along the longitudinal axis of the guide rail, the first blocking member comprising a first wall and a second wall facing each other and configured to rub against a first friction surface and a second friction surface of the guide rail, respectively, and the second blocking member comprising a third wall and a fourth wall facing each other and configured to rub against the first friction surface and the second friction surface of the guide rail, respectively,

[0052] And wherein the first sliding element is a lower profile and the second sliding element is an upper profile, which can be slidably mounted along the lower profile, the first blocking member and the second blocking member extend inwardly into the gap between the upper profile and the lower profile, the guide rail is rigidly connected to the lower profile and is accommodated in the gap, and the first blocking member and the second blocking member protrude from the upper profile through at least one opening of the upper profile.

[0053] According to the present invention, the system for locking by support comprises:

[0054] a stop device formed integrally with the second sliding element, projecting above the upper profile, the stop device being interposed between a protruding portion of the first blocking member extending from the first opening of the upper profile and a protruding portion of the second blocking member extending from the second opening of the upper profile,

[0055] And wherein, the stopping device comprises:

[0056] a first stop surface facing the protruding portion of the first blocking member and defining, together with the opposing surface of said first blocking member, a first groove whose profile converges along a vertical component, for example with a width that decreases from the bottom to the top,

[0057] a second stop surface facing the protruding portion of the second blocking member, which defines, together with the opposing surface of the second blocking member, a second groove whose profile converges along the vertical component, for example with a width that decreases from the bottom to the top,

[0058] a first wedge element extending in the first slot, the first elastic means being configured to move the first wedge element along the vertical component of the first slot into a first clamping position, wherein the first wedge element is blocked by a wedge effect against the first stop surface and the portion protruding from the first blocking member, the first blocking member being supported on the guide rail by generating a first force between the first blocking member and the first wedge element, and the second sliding element being locked relative to the first sliding element in the first sliding direction by two reactions of the guide rail on the first blocking member, the first reaction being between a first upper friction surface of the guide rail and a first wall of the first blocking member, and the second reaction being between a second lower friction surface of the guide rail and a second wall of the first blocking member,

[0059] a second wedge element extending in the second slot, the second elastic means being configured to move the second wedge element along the vertical component of the second slot into the second clamping position, wherein the second wedge element is blocked by a wedge effect against the second stop surface and the portion protruding from the second blocking member, the second blocking member being supported on the guide rail by generating a second force between the second blocking member and the second wedge element, and the second sliding element being locked relative to the first sliding element in the second sliding direction by two reactions of the guide rail on the first blocking member, a third reaction being between the first upper friction surface of the guide rail and the third wall of the second blocking member, and a fourth reaction being between the second lower friction surface of the guide rail and the fourth wall of the second blocking member,

[0060] - an unlocking mechanism configured to drive the movement of the first wedge element along the vertical component of the first slot and the movement of the second wedge element along the vertical component of the second slot from a position constrained by the first elastic means and the second elastic means, thereby ensuring the support of the first blocking member and the second blocking member on the guide rail and thus locking the slide rail, and to a retracted position of the first wedge element and the second wedge element, thereby eliminating the support of the first blocking member and the second blocking member on the guide rail and releasing the slide rail to enable it to slide.

[0061] The features disclosed in the following paragraphs can optionally be implemented independently of each other or in combination with each other:

[0062] According to one embodiment, the first wedge member and the second wedge member are configured to ensure the first force and the second force during the micro-movement between the second sliding element and the first sliding element generated by the longitudinal stress on the second sliding element, thereby ensuring the support of the first blocking member and the second blocking member, and compensation is performed by moving one or even two wedge elements of the wedge elements consisting of the first wedge element and the second wedge element, and compensation is performed by changing the contact point between the wedge element and the blocking member (i.e., the first blocking member or the second blocking member), while the other wedge element (i.e., the second wedge element or the first wedge element) can remain stationary while maintaining the contact point between the wedge element and the blocking member (i.e., the first blocking member or the second blocking member).

[0063] According to one embodiment, the slide rail locking system may include a spring device located between the first blocking member and the second blocking member, so that the first blocking member is always in contact with the first wedge element even when the first wedge element is in a retracted position that releases the sliding of the slide rail, and the second blocking member is always in contact with the second wedge member even when the second wedge member is in a retracted position that releases the sliding of the slide rail.

[0064] According to one embodiment, the spring arrangement comprises a torsion spring comprising a coil of elastic wire forming turns, the two ends of the coil of elastic wire bearing on the first and second blocking members, respectively.

[0065] According to one embodiment:

[0066] - the first wedge-shaped element is a first metal wire having a wedge-shaped portion, the wedge-shaped portion being arranged in a first groove above the first opening, the first metal wire being shaped so as to extend below the height of the wedge-shaped portion to a hinged portion, the hinged portion being hinged on a first end of a first lever, the first lever being located below the height of the first opening, the first lever having a second end hinged on a flank of the upper profile, and wherein the first elastic means comprises a first torsion spring mounted on the second end of the first lever, the first torsion spring being configured to elastically constrain the first lever from rotating in a direction driving the first metal wire upward to a first constrained position of the first wedge-shaped element,

[0067] -The second wedge-shaped element is a second metal wire, which has a wedge-shaped portion, which is arranged in a second groove above the second opening, and the shape of the second metal wire is designed to extend below the height of the wedge-shaped portion to a hinged portion, which is hinged on a first end of a second lever, the second lever is located below the height of the second opening, the second lever has a second end hinged on the side wing of the upper profile, and wherein the second elastic device includes a second torsion spring mounted on the second end of the second lever, the second torsion spring being configured to elastically constrain the second lever from rotating in a direction driving the second metal wire upward to reach a second constrained position of the second wedge element.

[0068] According to one embodiment, the first end of the first lever and the first end of the second lever are juxtaposed and arranged between the second end of the first lever and the second end of the second lever in the longitudinal direction of the slide rail, the unlocking mechanism includes a manually operated control lever, which is hinged to the second sliding element via a transverse axis, and the transverse axis is pivotally mounted on the side wing of the upper profile, the control lever includes a force distribution member, which is configured to contact and span the first lever and the second lever, and is configured to transmit the unlocking force to the control lever and distribute it to the first end of the first lever and the first end of the second lever, so that the first lever rotates around its second end against the return force of the first torsion spring, and the second lever rotates around its second end against the return force of the second spring.

[0069] According to one embodiment, the force distributing member may be made entirely or partially of an elastic material.

[0070] According to one embodiment, the force distribution member is pivotally mounted to the control lever along a transverse hinge axis.

[0071] According to one embodiment, the wedge-shaped portion and the hinge portion of the first wire or the second wire extend along two parallel axes and are connected by a bend of the wire.

[0072] According to a second aspect, the invention relates to a vehicle seat comprising a seat cushion, a backrest and a system according to the invention for locking a continuously adjustable slide rail, a first sliding element of which is anchored to the floor of the vehicle and a second sliding element of which is rigidly connected to the frame of the seat cushion. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Other features, details, and advantages will become apparent from a reading of the following detailed description and an analysis of the accompanying drawings, in which:

[0074] Figure 1

[0075] [ Figure 1 ] shows a vehicle seat comprising a seat cushion and a backrest and having a locking system with two locking slides, comprising two parallel slides, wherein a first sliding element formed by a lower profile is rigidly connected to the vehicle floor and a second sliding element formed by an upper profile is rigidly connected to the frame of the seat.

[0076] Figure 2

[0077] [ Figure 2 ]yes Figure 1 Detailed view of one of the two continuously adjustable slide rail systems of a seat, including a first stop and a second stop, each configured to be supported on the inner rail in the gap, the first stop and the second stop protruding through the upper profile through a first opening and a second opening, respectively.

[0078] Figure 3

[0079] [ Figure 3 ]yes Figure 2 Detailed view of a stop device, showing a body of the stop device rigidly connected to the upper rail profile, longitudinally between the first opening and the second opening, the stop device comprising:

[0080] a first vertically extending stop surface, facing the protruding portion of the first blocking member, defining, together with an opposing surface of the protruding portion of the first blocking member, a first groove, the profile of which converges along a vertical component and decreases in width from the bottom to the top, into which first groove a first wedge-shaped element is wedged to ensure that the first blocking member is supported on the guide rail,

[0081] a second vertically extending stop surface, facing the protruding portion of the second blocking member, defining, together with the opposing surface of the protruding portion of the second blocking member, a second groove, the profile of which converges along the vertical component and the width of which decreases from the bottom to the top, into which the second wedge-shaped element is wedged to ensure that the second blocking member is supported on the guide rail.

[0082] Figure 4

[0083] [ Figure 4 ]yes Figure 2 Exploded view of the continuously adjustable rail system shown.

[0084] Figure 5

[0085] [ Figure 5 ] A cross-section parallel to the XZ plane is shown on the left and a detailed perspective view is shown on the right, showing:

[0086] - the first restraining position of the first wedge element is clamped in the first groove by a wedge effect, thereby causing the first locking element to be supported on the guide rail, and the first restraining position of the first wedge element is clamped in the first groove by a wedge effect under the action of the first lever elastically restrained by the first torsion spring, thereby causing the first locking element to be supported on the guide rail to ensure locking of the slide rail in the first sliding direction;

[0087] -The second restraining position of the second wedge element is clamped in the second groove by the wedge effect under the action of the second lever elastically restrained by the second torsion spring, thereby causing the second locking element to be supported on the guide rail, and the second restraining position of the second wedge element is clamped in the second groove by the wedge effect, thereby causing the second locking element to be supported on the guide rail to ensure the locking of the slide rail in the second sliding direction.

[0088] Figure 6

[0089] [ Figure 6 ] is included Figure 5 , a view of a cross-section and a perspective view, after unlocking the slide rail by eliminating the support between the guide rail and the first and second blocking members, unlocking is achieved by rotating the first lever about its second end against the return force of the first torsion spring, which causes the first wedge member to drop to a position in the first groove where the wedge effect is eliminated, and unlocking is achieved by rotating the second lever about its second end against the return force of the second torsion spring, which causes the second wedge member to drop to a position in the second groove where the wedge effect is eliminated, the view in particular showing that the torsion spring is integrally formed with an insert which is integrally formed with the upper profile, which has a first end which bears on the first blocking member and has a second end.

[0090] Figure 7A

[0091] [ Figure 7A ] shows a locking system for a continuously adjustable slide rail in a first constrained position of a first wedge element and in a second constrained position of a second wedge element, thereby ensuring the locking of the slide rail, and in particular shows an unlocking mechanism, which comprises a control lever, which is hinged to the upper profile along a transverse axis via a transverse shaft and is in an unstressed position of the unlocking mechanism.

[0092] Figure 7B

[0093] [ Figure 7B ] shows that according to Figure 7A The locking system of the slide rail, after the control rod rotates around the transverse axis, the unlocking mechanism includes a force distribution member, which is hinged on the control rod and configured to contact the two opposite ends of the first lever and the second lever at the same time to ensure that the two levers (i.e., the first lever and the second lever) rotate in opposite directions at the same time, thereby causing the first wedge element to be displaced downward in the first groove, ensuring the elimination of the wedge effect in the widened area of ​​the first groove, thereby eliminating the support situation between the first blocking member and the guide rail, and causing the second wedge element to be displaced downward in the second groove, ensuring the elimination of the wedge effect in the widened area of ​​the second groove, thereby eliminating the support situation between the second blocking member and the guide rail. DETAILED DESCRIPTION

[0094] Furthermore, the invention relates to a system 1 for locking a continuously adjustable slide rail for a vehicle seat, comprising:

[0095] a slide rail 2 comprising a first, lower sliding element 20 configured to be fixed to the vehicle floor, and a second, upper sliding element 21 configured to slide along the first sliding element,

[0096] - Locking system via supports.

[0097] The locking system by support allows the slide to be continuously locked in an infinite number of locking positions within the effective travel of the slide, as opposed to a discrete adjustment system which has a limited number of locking positions.

[0098] The system of locking by support is self-sufficient, since it does not supplement a locking system of the discrete adjustment type, in which the grooves are used to ensure this discrete adjustment.

[0099] In the figures, the orthogonal reference system XYZ is oriented such that the axis X is oriented along the sliding axis of the slide rail, the direction Y is oriented along the horizontal direction, transverse to the slide rail, perpendicular to X, and the axis Z is oriented along the vertical direction.

[0100] The first sliding element 20 comprises a lower profile PINF, whose cross section comprises a base extending substantially in a plane parallel to the XY plane, extended by one or two upward-pointing wings. The second sliding element 21 comprises an upper profile PSUP, whose cross section comprises a main wing 210 extending substantially in a plane parallel to the XY plane, extended by two downward-pointing wings 211, 212. The ends of the upward-pointing wing and the ends of the downward-pointing wing interlock and form a raceway for a rolling element (e.g., a marble, etc.).

[0101] The drawings show a slide rail with an asymmetrical profile, i.e. the vertical dimensions of the two downward (respectively upward) wings are not equal. Generally, the present invention is applicable regardless of whether the profile is asymmetrical as shown or symmetrical (not shown).

[0102] The locking system by support comprises a guide rail 3 extending longitudinally along the slide, fixed relative to the first sliding element 20. The guide rail 3 is attached to the first sliding element 20. To this end, the lower profile PINF forming the first sliding part 20 may comprise a base and at least one upward wing extending from the base.

[0103] The guide rail 3 can be fixed to the at least one upward wing of the lower profile PINF, in the gap between the upper and lower profiles, in particular by means of tongues LG projecting from openings in the wall of the upward wing into the gap. The tongues are typically obtained by stamping and can be distributed along the length of the guide rail 3 to secure it. The position of the tongues relative to the blocking members allows the blocking members (i.e., the first and / or second blocking members) to slide relative to the first sliding element 21 in the unlocked state of the rail element, by continuously moving along the tongues, without the tongues hindering the movement of the blocking members. This allows the guide rail to be securely fixed along its length, including the sliding travel of the blocking members, and not just at its ends (beyond this travel).

[0104] The guide rail 3 has a first upper friction surface 30 and an opposing second lower friction surface 31. According to one embodiment, the first friction surface 30 and the opposing second lower friction surface 31 may be flat, with the guide rail having a generally rectangular cross-section. However, the guide rail may have another cross-section, such as a circular cross-section, in which case the first surface 30 and the second surface 31 are non-planar.

[0105] The locking system by support comprises a first blocking member 4 and a second blocking member 5, which are offset along the longitudinal axis of the guide rail 3, which extends along the longitudinal direction X. The first blocking member 4 and the second blocking member 5 are rigidly mounted on the second sliding element 21, that is, they are movable therewith, and their positions are offset along the longitudinal axis of the guide rail 3. The first blocking member 4 and the second blocking member 5 each extend longitudinally in the vertical direction along the direction Z or are slightly inclined towards this direction by a few degrees, the inclination being less than 25°, for example less than 10°.

[0106] The first blocking member 4 includes a first wall 40 and a second wall 41 facing each other, configured to rub against the first friction surface 30 and the second friction surface 31 of the guide rail respectively. The first wall 40 and the second wall 41 can be formed by two opposite side walls of the groove on the first blocking member, as shown in the figure.

[0107] The second blocking member 5 includes a third wall 50 and a fourth wall 51 facing each other, configured to respectively rub against the first friction surface 30 and the second friction surface 31 of the guide rail 3. The third wall 50 and the fourth wall 51 can be formed by two opposite side walls of the groove on the second blocking member 5, as shown in the figure.

[0108] In general, the guide rail 3 is formed integrally with the lower profile PINF, housed in the gap, and the first and second blocking members 4, 5 extend inwardly into the gap between the upper profile PSUP and the lower profile PIN and protrude from the upper profile through at least one opening OV in the upper profile PSUP. Specifically, the first blocking member 4 passes through the upper profile PSUP via a first opening OV1 in the main wing, and the second blocking member 5 passes through the upper profile PSUP, specifically via a second opening OV2 in the main wing, the first opening OV1 and the second opening OV2 being offset in the longitudinal direction of the guide rail.

[0109] The locking system by support mainly includes a stop device BT formed integrally with the second sliding element 21, the stop device BT protruding above the upper profile PSUP, and the stop device is interposed between the protruding part of the first blocking member 4 extending from the first opening OV1 of the upper profile PSUP and the protruding part of the second blocking member 5 extending from the second opening OV2 of the upper profile PSUP.

[0110] The stopping device BT comprises:

[0111] a first stop surface SA1 facing the protruding portion of the first blocking member 4 and defining, together with the opposing surface of said first blocking member 4, a first groove FE1, the profile of which converges along a vertical component, for example a width which decreases from the bottom to the top along the vertical direction Z, said width being along the length of the slide rail as seen in the direction X,

[0112] a second stop surface SA2 facing the protruding portion of the second blocking member 5 and defining, together with the opposing surface of said second blocking member, a second groove FE2, the profile of which converges along the vertical component, for example decreasing in width from the bottom to the top along the Z direction, said width, viewed along the X direction, depending on the length of the slide.

[0113] The stop device may be formed by an integral body, integrally formed with the upper profile of the slide rail, as shown in the figure, with a first stop surface SA1 and a second stop surface SA2 formed by two opposite surfaces of the body, which may be parallel to each other and offset in the X direction.

[0114] Alternatively, according to an embodiment not shown, the stop device may comprise two separate or even distinct bodies, forming the first stop surface SA1 and the second stop surface SA2 respectively.

[0115] The system for locking by support further comprises a first wedge-shaped element OC1 extending in the first slot FE1 and a first elastic device EL1 configured to constrain the first wedge-shaped element OC1 to a first constrained clamping position PC1 (e.g., Figure 5 ), wherein the first wedge-shaped element OC1 is wedged against the first stop surface SA1 and the protruding portion of the first blocking member 4.

[0116] The first clamping position PC1 generates a first force FC1 between the first blocking member 4 and the first wedge element OC1, ensuring that the first blocking member 4 is supported on the guide rail 3. The second sliding element 21 is locked relative to the first sliding element 20 in the first sliding direction S1 by two reactions of the guide rail on the first blocking member. On the one hand, the first reaction R A1 Between the first upper friction surface 30 of the guide rail and the first wall 40 of the first blocking member 4 , on the other hand, a second reaction R B1 Between the second lower friction surface 31 of the guide rail and the second wall 41 of the first blocking member 4 .

[0117] The system for locking by support also includes a second wedge element OC2 extending in the second slot FE2 and a first elastic device EL2, the first elastic device EL2 being configured to constrain the second wedge element OC2 to be displaced along the vertical component of the second slot FE2 to a second constrained clamping position PC2, wherein the second wedge element OC2 is wedged against the second stop surface SA2 and the protruding part of the second blocking member 5.

[0118] The second clamping position PC2 generates a second force FC2 between the second blocking member 5 and the second wedge element OC2, ensuring that the second blocking member 5 is supported on the guide rail 3. The second sliding element 21 is locked relative to the second sliding element 21 in the second sliding direction S2 by two reactions of the guide rail on the second blocking member. On the one hand, the third reaction R A2 Between the first upper friction surface 30 of the guide rail and the third wall 50 of the second blocking member, on the other hand, the fourth reaction R B2 Between the second lower friction surface 31 of the guide rail and the fourth wall 51 of the second blocking member 5 .

[0119] The locking system also includes an unlocking mechanism 6, which is configured to drive the movement of the first wedge-shaped element OC1 along the vertical component of the first slot FE1 and the movement of the second wedge-shaped element OC2 along the vertical component of the second slot FE2, from positions PC1, PC2 constrained by the first elastic device and the second elastic device EL1, EL2, thereby ensuring the support of the first blocking member and the second blocking member on the guide rail and thus locking the slide rail, and to move to the retracted position of the first wedge-shaped element OC1 and the retracted position of the second wedge element OC2, thereby eliminating the support of the first blocking member 4 and the second blocking member 5 on the guide rail 3, releasing the slide rail so that it can slide.

[0120] Transition of the first wedge member OC1 from the first constrained position PC1 to the retracted position is achieved by moving the first wedge member OC1 along the vertical component of the first slot FE1 along the first stop surface SA1 , for example from top to bottom according to the embodiment particularly shown in the figures.

[0121] Transition of the second wedge member OC2 from the first constrained position PC2 to the retracted position is achieved by moving the second wedge member OC2 along the vertical component of the second slot along the second stop surface SA2 , eg from top to bottom according to the embodiment shown in the figures.

[0122] According to one embodiment:

[0123] - the first wedge-shaped member OC1 comprises a wedge-shaped portion extending in the transverse direction Y along the depth of the first groove FE1 and which may be circular in cross section when viewed in the XZ plane,

[0124] - the second wedge-shaped member OC2 comprises a wedge-shaped portion extending in the transverse direction Y along the depth of the second groove FE2, and its cross section may be circular when viewed in the XZ plane,

[0125] The diameter of the circular cross-section of the wedge-shaped portion (of the first wedge-shaped member OC1 and / or the second wedge-shaped member OC2) may advantageously be small, for example between 3 mm and 6 mm.

[0126] This configuration can reduce the overall size of the assembly of the first blocking member 4 , the second blocking member 5 , the stopper BT, the first wedge member and the second wedge member OC1 , OC2 when viewed in the longitudinal X direction of the slide rail.

[0127] Preferably, the first wedge member OC1 and the second wedge member OC2 are independent, and are configured to ensure that the first force FC1 and the second force FC2 are still guaranteed during the micro-movement between the second sliding element 21 and the first sliding element 20 generated by the longitudinal stress on the second sliding element 21, thereby ensuring the support of the first blocking member 4 and the second blocking member 5, and compensation is performed by moving one or even two of the wedge elements consisting of the first wedge element OC1 and the second wedge element OC2, and compensation is performed by changing the contact point between the wedge element and the blocking member (i.e., the first blocking member 4 or the second blocking member 5), while the other wedge element (i.e., the second wedge element OC2 or the first wedge element OC1 line) can remain stationary while maintaining the contact point between the wedge element and the blocking member (i.e., the first blocking member or the second blocking member).

[0128] In other words, the first wedge-shaped element OC1 and the second wedge-shaped element OC2 can independently of each other respectively perform a first compensation of the first blocking member 4 and / or a second compensation of the second blocking member 5 according to the longitudinal stress and in particular the stress in its direction.

[0129] The continuously adjustable slide rail locking system may include a spring device MR located between the first blocking member 4 and the second blocking member 5, the spring device being configured such that the first blocking member 4 is always in contact with the first wedge element OC1 even when the first wedge element OC1 is in a retracted position that releases the sliding of the slide rail, and the second blocking member 5 is always in contact with the second wedge member OC2 even when the second wedge member OC2 is in a retracted position that releases the sliding of the slide rail.

[0130] Under the action of the spring means MR, in the retracted position of the members OC1 , OC2 , the first wedge-shaped member OC1 is also in contact with the first stop surface SA1 and the second wedge-shaped member OC2 is in contact with the second stop surface SA2 .

[0131] According to one embodiment, the spring means MR comprises a torsion spring comprising a coil of elastic wire forming turns, the two ends of which bear on the first and second blocking members 4, 5 respectively.

[0132] like Figure 6As shown, the torsion spring can force the first blocking member 4 and the second blocking member 5 to tilt in opposite directions respectively to ensure that the first wedge member OC1 is always in contact with the first blocking member 4 and the first stop surface SA1, and to ensure that the second wedge member OC2 is always in contact with the second blocking member 5 and the second stop surface SA2.

[0133] In general, the support (usually plastic) forms an insert IST housed in the gap between the upper profile PSUP and the lower profile PINF. The insert IST is slidably connected to the upper section PSUP, in particular to the main upper wall of the upper profile 21. This insert support comprises a cavity open in the transverse direction, which receives the inner portion of the first blocking element 4 and the second blocking element 5.

[0134] It is noted that the torsion spring may be attached to the insert, between the two blocking members 4 , 5 , with the coil winding mounted on a pin protruding in the transverse direction Y from the insert.

[0135] In general, the insert may include a first reference stop BR4 configured to engage with the first blocking member 5 to block the first blocking member 5 in the longitudinal direction X, and a second reference stop BR5 configured to engage with the second blocking member 5 to block the second blocking member 5 in the longitudinal direction X. The first reference stop BR4 and the second reference stop BR5 face each other and are configured to maintain a maximum gap between the two blocking members 4 , 5 .

[0136] According to one embodiment (as shown in the figures), the first wedge-shaped element OC1 can be a first metal wire, generally having a circular cross-section, comprising a wedge-shaped portion arranged in a first groove FE1 above the first opening OV1, the shape of the first metal wire being designed to extend in particular along a lateral component Y and along a vertical component Z, extending below the height of the wedge-shaped portion to a hinge portion of the metal wire hinged to the first end of the first lever LV1.

[0137] The first lever LV1 is located below the height of the first opening OV1, and the first lever LV1 has a second end hinged on the side wing of the upper profile PSUP, specifically, wherein the first elastic device EL1 includes a first torsion spring mounted on the second end of the first lever, and the first torsion spring is configured to elastically constrain the first lever LV1 to rotate in the direction of driving the first metal wire upward to reach the first constrained position of the first wedge element.

[0138] The first lever LV1 is articulated to the hinge portion of the wire along a pivot axis extending in the transverse direction Y. To this end, a first end of the first lever LV1 comprises a first hole within which the hinge portion of the wire can pivot freely.

[0139] The first lever LV1 is hinged to the side of the upper profile along a pivot axis extending in the transverse direction Y. To this end, a first pin AX1 is attached to the upper profile of the slide rail and the second end of the lever comprises a second hole in which the first pin can pivot freely.

[0140] The first pin AX1 may typically pass through a hole in the downward wing 212 of the upper profile and be attached in a mounting hole in the insert IST.

[0141] The second wedge element OC2 can be a second metal wire having a wedge-shaped portion, which is arranged in the second groove FE2 above the second opening OV2, and the shape of the second metal wire is set to extend below the height of the wedge-shaped portion to the hinge portion hinged to the first end of the second lever LV2.

[0142] A second lever LV2 is positioned below the level of the second opening OV2, the second lever LV2 having a second end hinged to a flank of the upper profile PSUP. The second elastic device EL2 comprises a second torsion spring mounted on the second end of the second lever LV2, the second torsion spring being configured to elastically restrain the second lever LV2 from rotating in a direction that drives the second wire upward to a second restraining position of the second wedge-shaped element OC2.

[0143] The second lever LV2 is articulated to the hinge portion of the wire along a pivot axis extending in the transverse direction Y. To this end, a first end of the second lever LV2 comprises a first hole in which the hinge portion of the wire can pivot freely.

[0144] The second lever LV2 is hinged to the side of the upper profile along a pivot axis extending in the transverse direction Y. To this end, a second pin AX2 is attached to the upper profile of the slide rail, and the second end of the lever comprises a second hole in which the first pin can freely pivot.

[0145] The second pin AX2 may typically pass through a hole in the downward wing 212 of the upper section and be secured in a mounting hole in the insert IST.

[0146] The wedge portion and the hinge portion of the first metal wire (or the second metal wire) may extend along two parallel axes and be connected to each other via a bent portion of the metal wire.

[0147] It should be noted that the first end of the first lever LV1 and the first end of the second lever LV2 may be arranged side by side and between the second end of the first lever LV1 and the second end of the second lever LV2 along the longitudinal direction of the slide rail.

[0148] The unlocking mechanism 6 may comprise a lever, typically manually operated, such as accessible by the vehicle occupant, located below the front of the seat cushion.

[0149] The control lever can be articulated to the second sliding element 21 via a transverse axis 60 pivotally mounted on the lateral wings of the upper profile PSUP, in particular on bearings integral with the downward wing 212 of the upper profile.

[0150] The control lever includes a force distribution member 61 that is configured to contact and span the first lever LV1 and the second lever LV2. The force distribution member is configured to transmit a release force to the control lever and distribute it to the first end of the first lever LV1 and the first end of the second lever LV2, causing the first lever LV1 to rotate about its second end against the return force of the first torsion spring, and causing the second lever LV2 to rotate about its second end against the return force of the second spring until the first blocking member 4 and the second blocking member 5 are unlocked.

[0151] The force distribution member 61 , at least in the areas in contact with the levers LV1 , LV2 , may be made entirely or partially of an elastomeric material.

[0152] This design, consisting of the metal wire designed as wedge-shaped members OC1, OC2 and the elastically stressed levers (first lever LV1, second lever LV2), makes it possible to limit the overall dimensions of the system in the vertical direction Z, and in particular its overall dimensions above the upper profile, since the levers (first lever and second lever) are offset below the main wings 210 of the upper profile 210, in the lateral areas of the profile, without being too obtrusive when integrated with the seat.

[0153] This design facilitates the integration of such a slide system with the seat, in particular its connection with the seat frame, since the volume of the locking system above the main wing 210 of the upper section is reduced compared to the design taught in WO2023242497.

[0154] The invention also relates to a vehicle seat comprising a seat cushion and a backrest, the first sliding element 20 of which is anchored to the floor of the vehicle and the second sliding element 21 of which is rigidly connected to the frame of the seat cushion, and a locking system for a continuously adjustable slide according to the invention.

[0155] The chair usually has two continuously adjustable slide locking systems with two parallel slides. In this case, the control rod can be shared by the two slides, the transverse axis 60 being hinged on the upper profile of the two slides.

[0156] Reference Signs List

[0157] -1: Locking system for continuously adjustable vehicle rails

[0158] -2. Slide rail

[0159] -20. First sliding element

[0160] -200. Base

[0161] -201,202. Upward wing

[0162] -LG. Tongue

[0163] -PINF. Lower profile

[0164] -21. Second sliding element

[0165] -210.Main wing

[0166] -211,212. Downward wing

[0167] -PSUP. Upper profile

[0168] -3. Guide rails

[0169] -30.First friction surface

[0170] -31. Second friction surface

[0171] -4. First blocking member

[0172] -40,41. The first wall and the second wall respectively (configured to be over the center on the guide rail) -5. The second blocking member

[0173] -50,51. The third and fourth walls respectively (configured to be over-center on the guide rail) -BT. Stop device

[0174] BR4, BR5. First and second reference stops

[0175] -EL1, EL2. First and second elastic devices

[0176] -OC1. First wedge-shaped element

[0177] -OC2. Second wedge-shaped element

[0178] -FE1. First slot

[0179] -FE2. Second slot

[0180] -S1. First direction

[0181] -S2. Second direction

Claims

1. A system (1) for locking a continuously adjustable slide rail for a vehicle seat, comprising: A slide rail (2) comprising a first lower sliding element (20) configured to be attached to a vehicle floor, and a second upper sliding element (21) configured to slide along the first sliding element, Locking system via support, including: A guide rail (3) extending longitudinally along the slide rail and fixed relative to the first sliding element, the guide rail having a first upper friction surface (30) and an opposite second lower friction surface (31), a first blocking member (4) and a second blocking member (5) rigidly mounted and connected to the second sliding element (21), whose positions are offset along the longitudinal axis of the guide rail (3), the first blocking member (4) comprising a first wall (40) and a second wall (41) facing each other, which are configured to rub on the first friction surface (30) and the second friction surface (31) of the guide rail, respectively, the second blocking member (5) comprising a third wall (50) and a fourth wall (51) facing each other, which are configured to rub on the first friction surface (30) and the second friction surface (31) of the guide rail, respectively The invention relates to a sliding member comprising a first sliding element (20) and a second sliding element (21) which is slidably mounted along the lower profile (PINF), wherein the first sliding element (20) is a lower profile (PINF), the second sliding element (21) is an upper profile (PSUP), the first blocking member (4) and the second blocking member (5) extending inwardly into a gap between the upper profile (PSUP) and the lower profile (PINF), the guide rail being rigidly connected to the lower profile (PINF) and being accommodated in the gap, and the first blocking member (4) and the second blocking member (5) protruding from the upper profile through at least one opening (OV) of the upper profile (PSUP), Characterized in that the system for locking by support comprises: a stop means (BT) formed integrally with the second sliding element (21), extending above the upper profile (PSUP), said stop means being interposed between a protruding portion of the first blocking member (4) extending from a first opening (OV1) of the upper profile (PSUP) and a protruding portion of the second blocking member (5) extending from a second opening (OV2) of the upper profile (PSUP), And wherein said stopping means (BT) comprises: a first stop surface (SA1) facing the protruding portion of the first blocking member (4) and defining, together with the opposing surface of the first blocking member (4), a first groove (FE1) whose profile converges along a vertical component, for example decreasing in width from bottom to top, a second stop surface (SA2) facing the protruding portion of the second blocking member (5) which defines, together with the opposing surface of the second blocking member (5), a second groove (FE2) whose profile converges along a vertical component, for example with a width that decreases from bottom to top, a first wedge-shaped element (OC1) and first elastic means (EL1), the first wedge-shaped element (OC1) extending in the first slot (FE1), the first elastic means (EL1) being configured to move the first wedge-shaped element (OC1) along a vertical component of the first slot (FE1) to a first clamping position (PC1), wherein the first wedge-shaped element (OC1) is blocked by a wedge effect against the first stop surface (SA1) and a portion protruding from the first blocking member (4), by generating a tension between the first blocking member (4) and the first wedge-shaped element (OC1) a first force (FC1) ensuring support of the first blocking member (4) on the guide rail (3) and locking of the second sliding element (21) relative to the first sliding element in the first sliding direction (S1) by means of two reactions of the guide rail on the first blocking member, a first reaction (RA1) between the first upper friction surface (30) of the guide rail and the first wall (40) of the first blocking member (4) on the one hand, and a second reaction (RB1) between the second lower friction surface (31) of the guide rail and the second wall (41) of the first blocking member (4) on the other hand, a second wedge-shaped element (OC2) and a second elastic means (EL2), the second wedge-shaped element (OC2) extending in the second slot, the second elastic means (EL2) being configured to move the second wedge-shaped element (OC2) along the vertical component of the second slot (FE2) to a second clamping position (PC2), wherein the second wedge-shaped element (OC2) is blocked by a wedge effect against the second stop surface (SA2) and a portion protruding from the second blocking member (5), by generating a second clamping position between the second blocking member (5) and the second wedge-shaped element (OC2) two forces (FC2) ensuring support of the second blocking member (5) on the guide rail (3), ensuring locking of the second sliding element (21) relative to the first sliding element in the second sliding direction (S2) by means of two reactions of the guide rail on the first blocking member, a third reaction (RA2) between the first upper friction surface (30) of the guide rail and the third wall (50) of the second blocking member on the one hand, and a fourth reaction (RB2) between the second lower friction surface (31) of the guide rail and the fourth wall (51) of the second blocking member (5) on the other hand, An unlocking mechanism (6) is configured to drive the movement of the first wedge-shaped element (OC1) along the vertical component of the first slot (FE1) and the movement of the second wedge-shaped element (OC2) along the vertical component of the second slot (FE2) from positions (PC1, PC2) constrained by the first elastic device (EL1) and the second elastic device (EL2), thereby ensuring the support of the first blocking member and the second blocking member on the guide rail and thus locking the slide rail, and to move to the retracted position of the first wedge-shaped element (OC1) and the retracted position of the second wedge-shaped element (OC2), thereby eliminating the support of the first blocking member (4) and the second blocking member (5) on the guide rail (3) and releasing the slide rail so that it can slide.

2. The system (1) for locking a continuously adjustable slide rail according to claim 1, characterized in that The first wedge member (OC1) and the second wedge member (OC2) are configured so that, during the micro-movement between the second sliding element (21) and the first sliding element (20) generated by the longitudinal stress on the second sliding element (21), the first force (FC1) and the second force (FC2) are still guaranteed, thereby ensuring the support of the first blocking member (4) and the second blocking member (5), by moving one or even two of the wedge elements consisting of the first wedge element (OC1) and the second wedge element (OC2), and by changing the contact point between the wedge element and the blocking member, i.e. the first blocking member (4) or the second blocking member (5), while the other wedge element, i.e. the second wedge element (OC2) or the first wedge element (OC1), can remain stationary while maintaining the contact point between the wedge element and the blocking member, i.e. the first blocking member or the second blocking member.

3. The system for locking a continuously adjustable slide rail according to claim 1 or 2 comprises a spring device (MR) located between the first blocking member (4) and the second blocking member (5), so that the first blocking member (4) is always in contact with the first wedge element (OC1) even when the first wedge element (OC1) is in a retracted position to release the sliding of the slide rail, and the second blocking member (5) is always in contact with the second wedge member (OC2) even when the second wedge member (OC2) is in a retracted position to release the sliding of the slide rail.

4. The system for locking a continuously adjustable slide rail according to claim 3, wherein: The spring device (MR) comprises a torsion spring comprising a coil of elastic wire forming a turn, the two ends of the coil of elastic wire being supported on the first blocking member (4) and the second blocking member (5), respectively.

5. The system for locking a continuously adjustable slide rail according to any one of claims 1 to 4, characterized in that: - the first wedge-shaped element (OC1) is a first metal wire having a wedge-shaped portion arranged in a first slot (FE1) above the first opening (OV1), the first metal wire being shaped so as to extend below the level of the wedge-shaped portion to a hinged portion, the hinged portion being hinged on a first end of a first lever (LV1), the first lever being located below the level of the first opening (OV1), the first lever (LV1) having a second end hinged on a flank of the upper profile (PSUP), and wherein the first elastic means (EL1) comprises a first torsion spring mounted on the second end of the first lever, the first torsion spring being configured to elastically constrain the first lever (LV1) from rotating in a direction driving the first metal wire upwards to a first constrained position of the first wedge-shaped element, -The second wedge-shaped element (OC2) is a second metal wire having a wedge-shaped portion, which is arranged in a second groove (FE2) above the second opening (OV2), and the shape of the second metal wire is designed to extend below the height of the wedge-shaped portion to a hinged portion, and the hinged portion is hinged on a first end of a second lever (LV2), the second lever is located below the height of the second opening (OV2), the second lever (LV2) has a second end hinged on the side wing of the upper profile (PSUP), and wherein the second elastic device (EL2) includes a second torsion spring mounted on the second end of the second lever (LV2), the second torsion spring is configured to elastically constrain the second lever (LV2) to rotate in a direction driving the second metal wire upward to reach the second constrained position of the second wedge-shaped element (OC2).

6. The system for locking a continuously adjustable slide rail according to claim 5, wherein: The first end of the first lever (LV1) and the first end of the second lever (LV2) are arranged in parallel and between the second end of the first lever (LV1) and the second end of the second lever (LV2) along the longitudinal direction of the slide rail. The unlocking mechanism (6) includes a manually operated control lever, which is hinged to the second sliding element (21) through a transverse axis (60). The transverse axis (60) is pivotally mounted on the side wing of the upper profile (PSUP). The control lever includes a force distribution member (61), which is configured to contact and cross the first lever and the second lever, and is configured to transmit the unlocking force to the control lever and distribute it to the first end of the first lever (LV1) and the first end of the second lever (L2), so that the first lever (LV1) rotates around its second end against the return force of the first torsion spring, and the second lever (LV2) rotates around its second end against the return force of the second spring.

7. The system for locking a continuously adjustable slide rail according to claim 6, wherein: The force distribution member (61) is made entirely or partially of elastic material.

8. The system for locking a continuously adjustable slide rail according to claim 6 or 7, characterized in that: The force distributing member is pivotally mounted to the control lever along a transverse hinge axis.

9. The system for locking a continuously adjustable slide rail according to any one of claims 5 to 8, characterized in that: The wedge-shaped portion and the hinge portion of the first metal wire or the second metal wire extend along two parallel axes and are connected to each other through a bent portion of the metal wire.

10. A vehicle seat comprising a seat cushion, a backrest and a system of locking continuously adjustable slide rails according to any one of claims 1 to 9, the first sliding element (20) of the slide rails being anchored to the floor of the vehicle and the second sliding element (21) of the slide rails being rigidly connected to the frame of the seat cushion.

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