Locking fitting for a vehicle seat, fitting system and vehicle seat with fitting system

Abstract

Detent fitting (2) for adjusting a backrest (1) of a vehicle seat about a backrest axis (L) relative to a seat part in a pivoting operation from at least one operating position to a non-operating position, comprising a memory element (22), a release bushing (23) with a control contour (25) and a guide cam (24) projecting axially from a latch (14, 14a), wherein the memory element (22) has a semicircular section (27) with an external toothing (28) corresponding to a detent toothing (16) of a first fitting part (7), wherein the memory element (22) remains in its rest position when the backrest (1) is adjusted and when the backrest (1) pivots freely the release bushing (23) rotates in the opening direction and the memory element (22) is moved radially outwards by means of its control contour (25),whereupon the external toothing (28) and the locking toothing (16) engage and the memory element (22) is arranged in a rotationally fixed position relative to the first fitting part (7) in the locking toothing (16) formed on the first fitting part (7) and is held in this position by the guide cam (24) of the latch (14, 14a) until the previously set operating position is reached again, in which latches (14, 14a) are released for locking the backrest (1), wherein in the operating position, with the backrest (1) locked, the latches (14, 14a) are arranged in the locking toothing (16) formed on the first fitting part (7), wherein the first fitting part (7) can be locked to a second fitting part (8) by means of several toothed latches (14, 14a) which are guided radially by the second fitting part (8) between projections (11) and by a Control element (15) is forced to move radially outwards,where they interact with the detent teeth (16) formed on the inside of the first fitting part (7) to lock the detent fitting (2), wherein each bolt (14, 14a) has an axially projecting drive cam (17) which engages in a separately formed control groove (18) of the control element (15), wherein the bolts (14, 14a) are provided at their radially outer end with teeth which correspond to the detent teeth (16) and can be brought into meshing engagement with the detent teeth (16) of the first fitting part (7) designed as a ring gear, characterized in that only one of the bolts (14a) has the guide cam (24), wherein the bolt (14a) having the guide cam (24) is formed by a corresponding shaping and positioning of the corresponding control groove (18a) and / or the drive cam (17) precedes the other bars (14),so that the toothing of this bolt (14a) engages first with the locking toothing (16).

Description

[0001] The invention relates to a locking fitting for a vehicle seat according to the preamble of claim 1. Furthermore, the invention relates to a fitting system according to the preamble of claim 9. Furthermore, the invention relates to a vehicle seat with a fitting system according to the preamble of claim 10.

[0002] With locking fittings that allow the backrest to be folded forward, the current technology locks the backrest in the forwardmost locking position when folded back. The desired use position must be readjusted after each forward folding of the backrest. The adjustment range is accordingly limited.

[0003] DE 198 32 028 A1 discloses a joint mechanism for a vehicle seat comprising a seat surface and a backrest, wherein the backrest is pivotally mounted relative to the seat surface. The joint mechanism comprises a first and a second flange, one of which is intended to be fixedly connected to the seat surface and the other of which is intended to be fixedly connected to the backrest. The flanges are mounted rotatably relative to one another about a rotation axis, and the second flange is permanently fixedly connected to a first toothing extending over at least one circular arc centered on the rotation axis and having radially inwardly oriented locking fittings.The locking fittings are provided with a toothing suitable for cooperating with the toothing of the second flange, the locking fittings being guided in their radial sliding movement by a guide rigidly connected to the first flange between, on the one hand, an engaged position in which the toothings of the locking fittings cooperate with the toothing of the second flange to block the mechanism, and, on the other hand, a countersunk position in which the toothings of the locking fittings do not cooperate with the toothing of the second flange.The locking fittings each further comprise a first bolt projecting radially toward the second flange, and a locking cam for controlling the sliding movement of the respective locking fitting, wherein this locking cam is pulled by elastic devices toward a rest position in which the locking cam brings the respective locking fitting into its engaged position. The locking fittings each further comprise a first operating device with which the locking cam is moved from its rest position toward an actuating position in which this locking cam allows the locking fitting to slide toward its retracted position, as well as devices for moving the respective locking fitting from its engaged position to its retracted position when the locking cam changes from its rest position to its actuating position.Furthermore, a circular guide is provided, which is mechanically connected to the second flange. This circular guide cooperates with the first bolt in such a way that it securely holds the locking fitting in its countersunk position when the latter is located within a predetermined range of angular positions relative to the circular guide. The circular guide has an interruption into which the first bolt can engage when the locking fitting is not within the predetermined range of angular positions, thus allowing the locking fitting to slide radially outward into its engaged position. The circular guide is formed by a bar belonging to a movable storage part, which is rotatably mounted to the first and second flanges about the rotation axis.The interruption in the circular guide forms a radial guide in which the first pin can slide radially in the circumferential direction without play. The movable storage part further comprises a storage disc and a storage fitting, which is mounted radially sliding on the storage disc between, on the one hand, an engaged position in which the storage fitting cooperates with the second flange to block the storage disc relative to this second flange, and, on the other hand, a countersunk position in which the storage fitting does not cooperate with the second flange and allows free rotation of the storage disc relative to this second flange.

[0004] Furthermore, DE 199 15 863 A1 discloses a vehicle seat having a first and a second seat element, which are mounted pivotably relative to one another about a rotation axis. The vehicle seat further comprises a first joint mechanism having a locking device movable between, on the one hand, a locked position that prohibits relative pivoting movement between the first and second seat elements, and, on the other hand, an unlocked position that allows free pivoting between the first and second seat elements. The locking device is actuated by a first handling member that pivots about the rotation axis, wherein the first handling member can be urged into an angular rest position, where the first handling member sets the locking device into its locking position.Furthermore, the first handling element is movable in an angular actuation direction into an angular actuation position, where the first handling element sets the locking device into its unlocking position. The angular rest position and angular actuation position of the first handling element are fixed relative to the first seat element. A storage or memory mechanism is additionally provided, which is movable between, on the one hand, a rest position, where the memory mechanism is designed not to interfere with the relative pivoting movement of the first and second seat elements, and, on the other hand, an active position, where the memory mechanism is adapted to allow free pivoting of the first element relative to the second seat element only in a first angular direction, starting from the last set relative position of the two seat elements.The memory mechanism then allows the first seat element to pivot freely relative to the second seat element in a second angular direction opposite to the first angular direction, but only up to the last set relative position of the two seat elements. The memory mechanism can be actuated or controlled by a second handling element arranged for pivoting about the rotation axis.

[0005] Another generic locking fitting is disclosed in the document WO 2009 / 092 161 A1.

[0006] The object of the present invention is to provide a locking fitting for a vehicle seat, an improved fitting system and an improved vehicle seat with a fitting system, which is improved compared to the prior art.

[0007] With regard to the locking fitting for a vehicle seat, the problem is solved by the features specified in claim 1.

[0008] With regard to the fitting system, the problem is solved by the features specified in claim 9.

[0009] With regard to the vehicle seat with a fitting system, the object is achieved by the features specified in claim 10.

[0010] Advantageous further developments of the invention are the subject of the subclaims.

[0011] The locking fitting according to the invention for adjusting a backrest of a vehicle seat about a backrest axis relative to a seat part in a free pivoting process from at least one use position to a non-use position for a vehicle seat comprises a memory element, a release bushing and a guide cam protruding from a latch in the axial direction, wherein a return of the backrest to the previously set use position is possible by means of the memory element after the free pivoting process, wherein the memory element has a partially circular section with an external toothing formed corresponding to a locking toothing of a first fitting part, wherein the memory element remains in its rest position during the adjustment of the backrest and is arranged in a rotationally fixed manner to the first fitting part in the locking toothing formed on the first fitting part during the free pivoting of the backrest and is held in this position by the guide cam of the latch.until the previously set position of use is reached again, in which the latches for locking the backrest are released, whereby in the position of use in the locked state of the backrest the latches are arranged in the locking teeth formed on the first fitting part.

[0012] This enables a particularly simple design of a locking fitting with an integrated memory element. In particular, the additional effort required is significantly reduced compared to a conventional locking fitting without free-swing functionality.

[0013] Furthermore, the installation space of such a locking fitting is only slightly increased compared to a conventional locking fitting.

[0014] According to the current state of the art, one locking mechanism is required for the tilt adjustment and one for the free-swing function. Simultaneously operating both locking mechanisms may result in the fitting being accidentally adjusted, which may result in the fitting not locking properly again. Additional measures are being taken to prevent this.

[0015] Particularly advantageously, only one load-bearing locking mechanism is required for tilt adjustment and free-swing functionality, so that related synchronization problems are avoided.

[0016] Conveniently, the release bushing is rotatably arranged in the through-opening of the first fitting part, with one end of the release bushing being arranged within the locking fitting, while an opposite end of the release bushing protrudes from the locking fitting and is coupled to a second actuating element. In this way, an actuating movement of the corresponding actuating element can be transmitted to the locking fitting.

[0017] Advantageously, a control contour is formed on the outside of the fitting-side end of the release bushing, extending radially around the release bushing. This control contour enables easy control of all components involved in the free-pivoting process.

[0018] The memory element preferably has a partially circular section with external teeth configured to correspond to the locking teeth of a first fitting part. This enables a meshing connection between the external teeth and the locking teeth during the free pivoting process, resulting in the memory element being entrained when the first fitting part pivots.

[0019] For convenience, a partially circular stop track is formed on the memory element, the diameter of which is expanded at one end to form a recess. The guide cam can slide along this stop track during the free pivoting process. When the memory element is in its rest position, the guide cam is located in the recess. To enable this, the recess is shaped to correspond in contour and depth to the guide cam of one of the bolts.

[0020] Advantageously, the memory element has a recess whose contour is designed to correspond to the control contour of the unlocking bush, wherein the unlocking bush engages with the control contour in the recess of the memory element in such a way that the memory element is arranged on the unlocking bush so as to be displaceable in the radial direction or in the direction of the formation.

[0021] The fitting system for a vehicle seat, in particular for a motor vehicle seat, comprises a first locking fitting with a free-pivoting function and a second locking fitting without a free-pivoting function, wherein the locking fittings are coupled by a transmission rod. This significantly simplifies the design of such a fitting system, as a second Bowden cable from the actuating element of the free-pivoting function to the second locking fitting is eliminated.

[0022] In a vehicle seat with a seat part and a backrest, a fitting system is arranged in the force flow between the backrest and the seat part, which enables an adjustment of the inclination and a free pivoting movement of the backrest relative to the seat part as well as a return of the backrest after a free pivoting movement to a previously set position of use.

[0023] The invention is explained in more detail with reference to the attached schematic figures.

[0024] Showing: Fig. 1 schematically shows a perspective view of a backrest of a vehicle seat with a locking fitting according to the invention, Fig. 2 schematically shows an exploded view of a locking fitting according to the invention, Fig. 3 schematically shows an exploded view of a second locking fitting, Fig. 4 schematically shows a side view of a locking fitting according to the invention, which is locked in a use position of the backrest, Fig. 5 schematically shows a side view of a locking fitting according to the invention, which is unlocked for adjusting the inclination of the backrest, Fig. 6 schematically shows a side view of a locking fitting according to the invention, in which a memory element is arranged in the operating position, Fig. 7 schematically shows a side view of a locking fitting according to the invention, in which a memory element is arranged in the operating position and the bolts are unlocked, Fig. 8 schematically shows a side view of a locking fitting according to the invention at the beginning of the free pivoting of the backrest and Fig. 9 schematically shows a side view of a locking fitting according to the invention with a completely freely pivoted backrest.

[0025] Corresponding parts are provided with the same reference numerals in all figures.

[0026] Fig. 1 shows a schematic perspective view of a backrest 1 of a vehicle seat (not shown in detail) with a locking fitting 2 according to the invention.

[0027] The vehicle seat for a motor vehicle has a seat part (not shown) and a backrest 1 which can be pivoted relative to the seat part about a backrest axis L.

[0028] By actuating a first actuating element 3, which rotates a transmission rod 4 arranged horizontally in the transition area between the seat part and the backrest 1, the inclination of the backrest 1 relative to the seat part can be adjusted between different usage positions. The first actuating element 3 is designed as an operating lever and is positively and / or non-positively connected to the transmission rod 4. The first actuating element 3 is arranged at the end of the transmission rod 4 on the side of the vehicle seat facing toward a vehicle door.

[0029] By actuating a second actuating element 5, the backrest 1 can be pivoted into a non-use position, primarily into the freely pivoted position, in which the forward-pivoted backrest 1 of a front seat facilitates access to a rear row of seats. This process is also referred to as the freely pivoting process. The second actuating element 5 is designed as an operating lever and is pivotably arranged at an upper end of the backrest 1 on the side of the vehicle seat facing toward a vehicle door.

[0030] The longitudinal position of the vehicle seat can be optionally adjusted using conventional seat rails, which can be unlocked during the free-pivoting process so that the vehicle seat can be pushed forward in the direction of travel with the backrest 1 freely pivoted.

[0031] The inclination adjustment and free pivoting of the backrest 1 are achieved by means of the first locking fitting 2 according to the invention and a second locking fitting 6, by means of which the backrest 1 is attached to the seat part on both sides. The locking fittings 2, 6 thus form a fitting system.

[0032] The first locking fitting 2 has means for actuating the free pivoting process of the backrest 1 and comprises a memory element 22 which engages in a locking toothing 16 during the free pivoting process and thus stores the set travel position of the backrest 1 and at the same time holds the locking fitting 2 in the open position.

[0033] Fig. 2 shows a schematic exploded view of such a first locking fitting 2 according to the invention. The first locking fitting 2 is arranged on the side of the vehicle seat facing towards a vehicle door.

[0034] The second locking fitting 6 is designed as a conventional locking fitting and does not store a backrest position. The second locking fitting 6 is coupled to the first locking fitting 2 by means of the transmission rod 4. As a result, the second locking fitting 6 is opened by the transmission rod 4 both during the backrest adjustment and during the free-pivoting process. The second locking fitting 6 is arranged on a side of the vehicle seat facing towards a center tunnel of the vehicle. By using such a conventional locking fitting 6, synchronization problems between the locking fittings 2, 6 are avoided because the second locking fitting 6 is opened both during the adjustment and during the free-pivoting of the backrest and is only locked again after the transmission rod 4 is turned back at the end of the adjustment process.

[0035] Fig. 3 shows schematically an exploded view of such a second locking fitting 6 according to the invention.

[0036] The locking fittings 2, 6 each have a first fitting part 7 and a second fitting part 8, which are rotatable relative to each other about the backrest axis L. The transmission rod 4 is aligned with the backrest axis L. The two fitting parts 7 and 8 can each be approximately inscribed in a circular disc shape. To absorb the axially acting forces, i.e., to hold the fitting parts 7 and 8 axially together, a clamping ring 9 is preferably provided. In structural terms, the two fitting parts 7 and 8, together with the clamping ring 9, therefore form a disc-shaped unit.

[0037] With the installation of the respective locking fitting 2, 6, the first fitting part 7 is firmly connected to the structure of the backrest 1, for example, by a form-fitting, material-fitting, and / or force-fitting connection, i.e., it is firmly connected to the backrest part. The second fitting part 8 is then firmly connected to the structure of the seat part, i.e., it is firmly connected to the seat part. However, the assignments of the fitting parts 7 and 8 can also be reversed, i.e., the first fitting part 7 would then be firmly connected to the seat part and the second fitting part 8 to the backrest.

[0038] In the illustrated embodiment, the second fitting part 8 is positively, materially, and / or force-fittedly connected to a fastening element 10. This is preferably achieved by welding the fastening element 10 to the second fitting part 8 in the region of the recesses 12. The fastening element 10 projects beyond the edge of the second fitting part 8, with through holes 13 arranged in this projecting area, by means of which the locking fitting 2, 6 can be reversibly arranged, for example, screwed, to the structure of the seat part.

[0039] The two fitting parts 7 and 8 can be locked together by means of several toothed latches 14, 14a, which are guided radially between the formations 11 by the second fitting part 8 and are moved radially outwards by a control element 15, where they interact with a locking toothing 16 formed on the inside of the first fitting part 7 in order to lock the locking fitting 2, 6.

[0040] The locking bars 14, 14a are provided with a toothing at their radially outer end, which corresponds to the locking toothing 16 and can mesh with the locking toothing 16 of the first fitting part 7, which is designed as a ring gear. When the locking toothing 16 and the locking bars 14, 14a interact, the locking fitting 2, 6 is locked.

[0041] A driver cam 17 protruding in the axial direction is formed on each latch 14, 14a. This driver cam 17 engages in a control groove 18 of the control element 15, 15a. A separate control groove 18 is formed in the control element 15, 15a for each driver cam 17. By means of the control groove 18, the latches 14, 14a are positively guided by the control element 15, 15a in a conventional manner, in the manner of a slotted-and-pintle guide.

[0042] The control element 15, 15a is arranged in the center of the locking fitting 2, 6, and is arranged on the transmission rod 4 in a rotationally fixed manner or coupled to the drive by means of a correspondingly shaped central opening 19 and is rotatably mounted on the second fitting part 8, in particular in a central through-opening 20a thereof.

[0043] The control element 15, 15a is preloaded in the clamping direction by a spiral spring 21. The control element 15, 15a acts on the radially movable latches 14, 14a via the control groove 18 and presses them radially outward, causing the teeth of the latches 14, 14a to engage with the locking teeth 16, so that when the first actuating element 3 is not actuated, the locking fitting 2, 6 is locked.

[0044] In addition to the components already described, the first locking fitting 2, in contrast to the second locking fitting 6, comprises a memory element 22 and an unlocking bushing 23. Furthermore, a guide cam 24 projecting in the axial direction is formed on the latch 14a.

[0045] The release bushing 23 is rotatably mounted in the first fitting part 7. A control contour 25 is formed on the outside of one end of the release bushing 23, which extends radially around the release bushing 23. The other end of the release bushing 23 protrudes from the locking fitting 2 and is coupled to the second actuating element 5 by means of a lever, a return spring, and a Bowden cable (not shown).

[0046] The memory element 22 has a recess 26 whose contour corresponds to the control contour 25. In the assembled state, the release bushing 23 engages with the control contour 25 in the recess 26 of the memory element 22. As a result, the memory element 22 is arranged on the release bushing 23 so that it can be displaced in the axial direction.

[0047] The memory element 22 has a partially circular section 27 with external teeth 28 corresponding to the locking teeth 16. Furthermore, a partially circular stop track 29 is formed on the memory element 22, the diameter of which is expanded at one end to form a recess 30. This recess 30 is shaped in a shape and depth corresponding to the guide cam 24 of the latch 14a, so that the guide cam 24 and the recess 30 can engage in a positive-locking manner.

[0048] Fig. 4 shows schematically a side view of the locking fitting 2 according to the invention, which is locked in a use position of the backrest 1.

[0049] The control element 15 is preloaded in the clamping direction by the spiral spring 21. The control element 15 acts on the radially movable latches 14, 14a via the control groove 18 and presses them radially outward by means of the driver cams 17 engaging in the control groove 18, so that the teeth of the latches 14, 14a each engage with the locking teeth 16.

[0050] The memory element 22 is arranged in the rest position, so that the external toothing 28 of the memory element 22 and the locking toothing 16 are not engaged. Furthermore, the guide cam 24 is arranged completely within the recess 30 of the memory element 22.

[0051] Fig. 5 shows a schematic side view of the locking fitting 2 according to the invention, which is unlocked for adjusting the inclination of the backrest 1.

[0052] The control element 15 is rotated by the first actuating element 3 against the tensioning direction of the coil spring 21. As a result, the driver cams 17 of the latches 14, 14a slide along the control grooves 18 of the control element 15. Due to this forced movement of the driver cams 17, the latches 14, 14a are moved radially inward, toward the transmission rod 4. As a result, the teeth of the latches 14, 14a no longer engage with the locking teeth 16, whereby the locking fitting 2 is unlocked and the two fitting parts 7 and 8 can be rotated relative to one another about the backrest axis L. The inclination of the backrest 1 can thus be adjusted between several usage positions suitable for sitting.

[0053] The memory element 22 is still arranged in the rest position, in which the external toothing 28 of the memory element 22 and the locking toothing 16 are not engaged. Due to the movement of the locking bar 14a in the radially inward direction, the guide cam 24 is arranged in sections in the recess 30 of the memory element 22.

[0054] In the unlocked state after Fig. 5 allows the inclination of the backrest 1 to be adjusted. The release bushing 23 and guide cams 24 hold the memory element 22 in the rest position. When the backrest 1 is pivoted, the locks 14, 14a are held in the unlocked position by the control element 15.

[0055] Releasing the first actuating element 3 causes the control element 15 to rotate in the tensioning direction of the coil spring 21. This rotation is caused by the preload of the coil spring 21 and rotates the control element 15 in the clamping direction. As a result, the driver cams 17 of the latches 14, 14a slide along the control grooves 18 of the control element 15. Due to this forced movement of the driver cams 17, the latches 14, 14a are moved radially outward, so that the teeth of the latches 14, 14a reengage with the locking teeth 16, thus locking the locking fitting 2.

[0056] The teeth of the locking bars 14 engage the next locking position of the locking teeth 16. According to the invention, the locking bar 14a advances ahead of the other locking bars 14 due to the appropriate shape and positioning of the corresponding control groove 18a and / or the driver cam 17. This means that the teeth of this locking bar 14a are the first to engage the locking teeth 16. If a tooth of the teeth of this locking bar 14a now directly meets a tooth of the locking teeth 16, the teeth can slide off one another and engage securely. This ensures that the teeth of all locking bars 14, 14a engage in a secure locking position, even if the initial tooth-to-tooth position is in contact.

[0057] Fig. 6 shows schematically a side view of the locking fitting 2 according to the invention, in which the memory element 22 is arranged in the operating position.

[0058] To activate the free-pivoting action, the second actuating element 5 is activated. This is coupled to the release bushing 23 by means of a lever, a return spring, and a Bowden cable (not shown), and rotates the latter in the opening direction. The correspondingly shaped control contour 25 and its movement relative to the recess 26 of the memory element 22 move the latter radially outward. This engages the locking teeth 16 of the fitting part 7 and the external teeth 28 of the memory element 22.

[0059] The guide cam 24 is arranged in sections in the formation 30 of the memory element 22 due to the movement of the memory element 22 in the radial outward direction.

[0060] As the free pivoting process continues, the release bushing 23 continues to rotate clockwise, whereby the control element 15 is moved along and, in the manner already described, unlocks the latches 14, 14a, so that the locking fitting 2 is unlocked. This state is in Fig. 7 is shown schematically. For this purpose, a further control contour 25 is arranged on the release bushing 23, which engages in a corresponding recess of the control element 15.

[0061] The guide cam 24 is moved completely out of the formation 30 of the memory element 22.

[0062] When the locking fitting 2 is unlocked, the backrest 1 can be swung freely.

[0063] Fig. 8 shows a schematic side view of the locking fitting 2 according to the invention at the beginning of the free pivoting of the backrest 1.

[0064] When the backrest 1 pivots freely, the memory element 22, whose external toothing 28 engages with the locking toothing 16 of the fitting part 7, is pivoted together with the fitting part 7 relative to the latches 14, 14a. In doing so, the guide cam 24, which has been completely moved out of the recess 30 of the memory element 22, slides along the stop track 29 of the memory element 22. This holds the external toothing 28 in engagement with the locking toothing 16, in particular even when the second actuating element 5 is released by the user. Furthermore, this prevents a return movement of the latch 14a with the guide cam 24 into a locked position. The return movement of the bolts 14 of the locking fitting 2 is prevented by the fact that the driver cam 17 of the bolt 14a holds the control element 15 in the open position by engaging in the control groove 18a.The control element 15 then holds the second locking fitting 6 in the open position via the transmission rod 4.

[0065] Fig. 9 shows a schematic side view of the locking fitting 2 according to the invention with a completely freely pivoted backrest 1.

[0066] In the freely pivoted position of the backrest 1, the locking fitting 2 and the locking fitting 6 coupled to it remain unlocked.

[0067] During the return movement of the freely pivoted backrest 1, the guide cam 24 is moved along the stop track 29.

[0068] When the backrest 1 returns to the previously assumed position of use with the stored inclination, the guide cam 24 moves into the recess 30 of the memory element 22.

[0069] The arrangement of the guide cam 24 in the recess 30 allows the preload of the spiral spring 21 to act, rotating the control element 15 in the clamping direction. As a result, the driver cams 17 of the latches 14, 14a slide along the control grooves 18, 18a of the control element 15. Due to this forced movement of the driver cams 17, the latches 14, 14a are moved radially outward, so that the teeth of the latches 14, 14a reengage with the locking teeth 16, thus locking the locking fitting 2. The transmission rod 4 is rotated by the control element 15 and transmits the rotary movement to the control element 15a of the second locking fitting 6.

[0070] Furthermore, during the return movement of the freely pivoted backrest 1, the release bushing 23 is rotated in the closing direction by a return spring (not shown). The correspondingly shaped control contour 25 and its movement relative to the recess 26 of the memory element 22 cause the memory element 22 to move radially inward. This terminates the meshing engagement between the locking teeth 16 of the fitting part 7 and the external teeth 28 of the memory element 22.

[0071] The first locking fitting 2 and also the second locking fitting 6 are then locked and the memory position is reset. List of reference symbols 1 backrest 2 first locking fitting 3 first actuating element 4 transmission rod 5 second actuating element 6 second locking fitting 7 first fitting part 8 second fitting part 9 clasp ring 10 Fastening element 11 Formation 12 recess 13 through hole 14 bars 14a bar 15 Control 15a Control element 16 locking teeth 17 driving cams 18 Control groove 18a control groove 19 Opening 20 passage opening 20a Through opening 21 Spiral spring 22 Memory element 23 Release socket 24 guide cams 25 Control contour 25a Control contour 26 recess Section 27 28 external gearing 29 Stop track 30 Forming L backrest axis

Claims

[1] A locking fitting (2) for adjusting a backrest (1) of a vehicle seat about a backrest axis (L) relative to a seat part in a free pivoting process from at least one use position to a non-use position, comprising a memory element (22), an unlocking bushing (23) with a control contour (25) and a guide cam (24) projecting from a latch (14, 14a) in the axial direction, wherein the memory element (22) has a partially circular section (27) with an external toothing (28) corresponding to a locking toothing (16) of a first fitting part (7), wherein the memory element (22) remains in its rest position when the backrest (1) is adjusted and when the backrest (1) is freely pivoted, the unlocking bushing (23) rotates in the opening direction and by means of its control contour (25) the memory element (22) is moved outwards in the radial direction,whereby the external toothing (28) and the locking toothing (16) engage and the memory element (22) is arranged in a rotationally fixed manner to the first fitting part (7) in the locking toothing (16) formed on the first fitting part (7) and is held in this position by the guide cam (24) of the bolt (14, 14a) until the previously set position of use is reached again, in which bolts (14, 14a) are released for locking the backrest (1), wherein in the position of use in the locked state of the backrest (1) the bolts (14, 14a) are arranged locked in the locking toothing (16) formed on the first fitting part (7), wherein the first fitting part (7) can be locked to a second fitting part (8) by means of several toothed bolts (14, 14a) which are guided radially between formations (11) by the second fitting part (8) and are moved radially outwards by a control element (15),where they interact with the locking teeth (16) formed on the inside of the first fitting part (7) in order to lock the locking fitting (2), wherein on each bolt (14, 14a) there is formed a driver cam (17) projecting in the axial direction, which in each case engages in a separately formed control groove (18) of the control element (15), wherein the bolts (14, 14a) are provided at their radially outer end with a toothing which is formed corresponding to the locking teeth (16) and can be brought into meshing engagement with the locking teeth (16) of the first fitting part (7) formed as a ring gear, , characterized bythat only one of the bolts (14a) has the guide cam (24), wherein the bolt (14a) having the guide cam (24) leads the other bolts (14) by a corresponding shaping and positioning of the corresponding control groove (18a) and / or the driver cam (17), so that the toothing of this bolt (14a) is the first to engage with the locking toothing (16). [2] Locking fitting (2) according to claim 1, characterized by that the unlocking bushing (23) is rotatably arranged on a transmission rod (4), wherein one end of the unlocking bushing (23) is arranged within the locking fitting (2), while an opposite end of the unlocking bushing (23) protrudes from the locking fitting (2) and is coupled to a second actuating element (5). [3] Locking fitting (2) according to claim 1 or 2, characterized bythat the control contour (25) is formed in sections on the outside of the release bushing (23) at the fitting-side end, which control contour runs around the release bushing (23) in the radial direction. [4] Locking fitting (2) according to one of the preceding claims, characterized by that a partially circular stop track (29) is formed on the memory element (22), the diameter of which is widened at one end to form a formation (30). [5] Locking fitting (2) according to claim 4, characterized by that the shape (30) is shaped in contour and depth corresponding to the guide cam (24) of the bolt (14a). [6] Locking fitting (2) according to one of the preceding claims, characterized by that the memory element (22) has a recess (26) whose contour is designed to correspond to the control contour (25) of the unlocking bush (23). [7] Locking fitting (2) according to claim 6, characterized bythat the unlocking bushing (23) engages with the control contour (25) in the recess (26) of the memory element (22) in such a way that the memory element (22) is arranged on the unlocking bushing (23) so as to be displaceable in the direction of the formation (30). [8] Locking fitting (2) according to one of the preceding claims, characterized by that the bolts (14, 14a) are arranged pivotably about a respective rotation axis in the second fitting part (8). [9] Fitting system for a vehicle seat, in particular for a motor vehicle seat, comprising a locking fitting (2) according to one of claims 1 to 8 and a locking fitting (6) without a free pivoting function, wherein the locking fittings (2, 6) are coupled by means of a transmission rod (4). [10] Vehicle seat with a seat part and a backrest (1), wherein a fitting system according to claim 9 is arranged in the force flow between the backrest (1) and the seat part, which fitting system enables an inclination adjustment and a free pivoting operation of the backrest (1) relative to the seat part and a return of the backrest (1) after a free pivoting operation into a previously set position of use.

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