Seat front-to-back adjuster and seat

Abstract

To provide an improved seat which provides an easy-entry function.SOLUTION: The present invention relates to a longitudinal adjuster (2) for a seat, in particular, a vehicle seat. The longitudinal adjuster (2) comprises: at least a fixed lower track (3); an upper track (4) slidable coupled to the lower track (3); an adjustment device (7) for longitudinally adjusting the upper track (4) relative to the lower track (3); a latch mechanism (6) to latch the upper track (4) relative to the lower track (3); and an electromechanical device (8) relatively coupled to the latch mechanism (6). The electromechanical device (8) is configured to bias the latch mechanism (6) between a release position (RP) and a latch position (LP), and upon release of the latch mechanism (6) the adjustment device (7) is actuated to drive the upper track (4) relative to the lower track (3).SELECTED DRAWING: Figure 1B

Description

Technical Field

[0001] The present disclosure relates generally to seats, particularly a fore-and-aft adjuster for vehicle seats. In particular, the fore-and-aft adjuster is configured to adjust the seat for easy entry. The present disclosure also relates to a seat provided with such a fore-and-aft adjuster.

Background Art

[0002] Fore-and-aft adjusters for seats are known from the prior art. The fore-and-aft adjuster comprises at least a track mechanism having a lower track fixed to the vehicle floor and an upper track slidably connected to the lower track.

[0003] Various easy entry systems, which are part of vehicle seats, are known to enable easy access to the second row of vehicle seats.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present disclosure is to provide an improved fore-and-aft adjuster for seats, particularly for vehicle seats. Another object of the present invention is to provide an improved seat having such a fore-and-aft adjuster, particularly providing an easy entry function.

Means for Solving the Problems

[0005] According to the above fore-and-aft adjuster, the above object is solved by the features described in claim 1. According to the above seat, particularly the vehicle seat, the above object is solved by the features described in claim 13.

[0006] According to this disclosure, a longitudinal adjuster for a seat, particularly a vehicle seat, comprises at least a fixed lower track and an upper track slidably coupled to the lower track, a latch mechanism for engaging the upper track with respect to the lower track, and an adjustment device for adjusting the upper track longitudinally relative to the lower track. The longitudinal adjuster also comprises an electromechanical device coupled relative to the latch mechanism, the electromechanical device being configured to bias the latch mechanism between a released position and a latched position, and when the latch mechanism is released, the adjustment device is actuated to drive the upper track relative to the lower track. In particular, the adjustment device drives the upper track longitudinally. For example, the longitudinal adjuster is configured to move the seat from a use position, specifically a seated and / or comfort position, to an easy-entry position that provides easy access to the rear of the seat. In particular, the upper track is electrically driven by the adjustment device when the latch mechanism is in the released position.

[0007] According to the present invention, a function is realized to reduce the effort required to return the seat from the easy-entry position to the usage position. In particular, the effort required to return the seat from the easy-entry position to the locked position is reduced.

[0008] Furthermore, the present invention enables substantially automated adjustment of the upper track relative to the lower track from one position to another. Manual adjustment of the seat, such as pushing or pulling the seat from one position to another after manually releasing the latch mechanism, is not required.

[0009] Furthermore, the present invention, when combined with low-cost and relatively lightweight components, enables a high level of functionality and performance, such as high-speed powered rearward movement of the seat from an easy-entry position.

[0010] For example, the electromechanical device is configured as a solenoid having at least one electromagnetic actuator that biases the latch mechanism in one direction and at least one spring element that biases the latch mechanism in the opposite direction. In particular, the use of an electromechanical device can reduce the number of parts and required installation space for operating the latch mechanism. Furthermore, by utilizing such an electromechanical device, a significantly simplified self-operating adjustment of the latch mechanism is possible without the user having to apply external force manually. Depending on the linear motion of the electromagnetic actuator when power is applied, the spring element is either a pressure spring or a tension spring that biases the latch mechanism in one of the opposite directions when the power is removed.

[0011] The biasing force initiated by an electromechanical device is understood to be, for example, an attractive force or a pushing force.

[0012] According to one embodiment, the electromagnetic actuator is configured to bias the latch mechanism from the latched position to the released position or vice versa, i.e., to push or pull, especially when power is applied. The spring element is configured to bias the latch mechanism from the released position to the latched position or vice versa, i.e., to pull or push, especially when power is cut off.

[0013] For example, if an electromechanical device is configured to release a latch mechanism when power, particularly electrical output / current, is applied, then the electromechanical device is in one of its active states. In the active state, the electromechanical device biases the latch mechanism from the latched position to the released position. Therefore, the electromechanical device is configured to lock the latch mechanism when no power is applied, such as when the power is switched off. This means the electromechanical device is in one of its passive states. In this case, the electromechanical device is configured as an on / off solenoid, in which case, when power is applied, the electromagnetic actuator pushes or pulls the latch mechanism from one position to another, and when no power is applied, the electromagnetic actuator is released so that the spring element can push or pull the latch mechanism from one position to another.

[0014] Optionally, the electromechanical device is configured as a locking solenoid that holds a latch mechanism in a fixed position without a constant power supply. For example, by applying a transient current of one polarity to an electromagnetic actuator, the electromagnetic actuator biases the latch mechanism from one position to another, and holds the latch mechanism in the first position until a transient current of the opposite polarity is applied to the electromechanical device. This current cancels out the magnetic force of the electromagnetic actuator, allowing a spring element to bias the latch mechanism to the opposite position.

[0015] According to possible embodiments, the electromechanical device is configured to bias the latch mechanism from the released position back to the latched position when the latch mechanism and / or upper track reach a specified position. More specifically, the electromechanical device is configured to automatically bias the latch mechanism from the released position back to the latched position.

[0016] For example, an end stop located in the forward area of ​​the track indicates a designated position, such as a forward position for easy entry. When the released latch mechanism and / or the upper track comes into contact with the end stop, the power applied to the electromechanical device is switched off, or more precisely, cut off.

[0017] Furthermore, a designated position, such as a rearward position, or in particular, an initial position such as the seat's use or comfort position, is a predetermined position that is transmitted to the power supply of the electromechanical device. For example, when the latch mechanism reaches a predetermined designated position, the power applied to the electromechanical device is switched off, or more precisely, cut off. For example, a predetermined and designated rearward position is a position prior to the latch position. Subsequently, the electromechanical device can bias the latch mechanism to the latch position once the force biasing the latch mechanism in the released position is switched off.

[0018] Furthermore, the electromechanical device is configured to communicate with a control unit having multiple sensors. The control unit transmits received signals from the sensors to activate or deactivate the electromechanical device, specifically by applying or interrupting power to the electromagnetic actuator.

[0019] According to another embodiment, the adjustment device is configured to stop driving when the latch mechanism and / or upper track reach the endstop position. For example, the adjustment device stops driving when the latch mechanism is positioned in its predetermined latch position and, more specifically, locked. This causes the latch mechanism and, therefore, the upper track to be in the endstop position. A signal to stop the adjustment device from driving can be initiated after detecting an increase in resistance experienced by the adjustment device.

[0020] For example, an end stop located in the forward area of ​​the track indicates the end stop position, such as the forward end stop position for easy entry. When the released latch mechanism and / or the upper track comes into contact with the end stop, the adjustment device stops driving. Also, when the adjustment device stops driving, the latch mechanism is biased from the released position to the latched position.

[0021] In particular, to initiate the rearward movement of the upper track from the forward endstop position back to the rear endstop position (especially the comfortable position), the user can operate an operating element and / or apply force to the seat. For example, when the control unit detects a force acting on the seat (e.g., the seat pan or seat back) toward the rear, an electromechanical device is activated to bias the latch mechanism from the latched position to the released position, while an adjustment device is switched on to electrically drive the upper track in the opposite direction to the lower track.

[0022] In other words, the rear endstop position is transmitted to the adjustment device when it detects the latch mechanism in the latched position. The front endstop position may be transmitted to the adjustment device when it detects an increase in resistance affecting the adjustment device, and / or when it detects contact between the endstop and the latch mechanism and / or the upper track.

[0023] For this purpose, the adjustment device is configured to communicate with a control unit having multiple sensors. Furthermore, the switching between the electromechanical device and the adjustment device can be initiated in a mutually dependent manner. In this way, smooth switching between the various states of the electromechanical device and the adjustment device is ensured.

[0024] In a further embodiment, the electromechanical device is actuated via an operating element. For example, the operating element is located inside the vehicle, for example, in the dashboard area or the rear compartment area and / or on the corresponding seat. Thus, the operating element may be a button, a lever, a switch or any other operable element. In detail, by operating the operating element, the electromechanical device receives a signal that biases the latch mechanism from the latched position to the released position. When the latch mechanism is released, the adjustment device receives a signal that the latch mechanism is released so that the upper track is in a sliding position. The adjustment device is then actuated to drive the upper track relative to the lower track, in detail forward or backward.

[0025] For example, a latch mechanism is a typical latch mechanism. The latch mechanism is substantially located within a track contour formed by a lower track and an upper track. More specifically, the lower track and the upper track are formed such that they alternately engage with each other around each other to form the track contour.

[0026] For example, the latch mechanism is formed as a latch plate or a latch lever, a claw or a catch. The latch mechanism includes a plurality of latch elements, such as protruding elements like tooth elements protruding from the latch plate. The protruding elements protrude through an opening formed in the upper track. Also, in order to latch the upper track to the lower track, the protruding elements protrude into an opening formed in the lower track. Specifically, the latch mechanism is arranged to be movable within the track contour. By moving the latch mechanism, for example, up and down, the protruding elements are released from the opening of the lower track. Thereby, the upper track becomes slidable relative to the lower track.

[0027] In another embodiment, the electromechanical device is arranged on the upper track and is directly connected to the latch mechanism. For example, the electromechanical device is arranged on the upper surface of the upper track above the latch mechanism. The latch mechanism includes an actuating pin, a rod or a bolt. The actuating pin is guided through an upper opening formed in the upper surface of the upper track. The actuating pin is connected to the electromechanical device and thus to the upper track. By actuating an electromechanical device such as a solenoid, the plunger of the electromechanical device is biased up and down by an electromagnetic force and at the same time biases the actuating pin of the latch mechanism to lock or unlock the latch mechanism relative to the lower track.

[0028] According to another possible embodiment, the electromechanical device is arranged away from the upper track, and the electromechanical device is connected to the latch mechanism via a toggle bar. Depending on the assembly space under the seat, the arrangement of the electromechanical device can be variably adapted. Specifically, by arranging the electromechanical device away from the upper track, the overall package is improved. Also, by connecting the electromechanical device and the latch mechanism via a toggle bar, a dual-actuation function becomes possible.

[0029] In a further embodiment, the adjustment device is configured as an external transmission device. Specifically, the upper track is disengaged from the lower track by using an electromechanical device, particularly an electromagnetic actuator, and then the movement of the upper track is actuated by external transmission by the adjustment device.

[0030] According to another embodiment, the adjustment device comprises a rack and pinion drive disposed at least partially along the length of the track. Thereby, for example, the power-on from the comfortable use position of the second row seat to the easy entry position and from the easy entry position to the locked comfortable use position is significantly simplified.

[0031] Another embodiment is provided where the rack and pinion drive comprises at least a toothed rack fixed relative to the lower track and a pinion fixed relative to the upper track. For example, the toothed rack extends at least partially along the length of the lower track. Specifically, the toothed rack is arranged to extend substantially parallel to the side portion of the track. The pinion is power-driven and engages with the toothed rack to move along the front-back direction. Thereby, the upper track moves due to the movement caused by the power supply to the pinion. For example, the upper track is disconnected from the lower track by using an electromechanical device, particularly an electromagnetic actuator, and subsequently, external transmission is performed by the interaction between the pinion and the rack.

[0032] According to a further embodiment, the adjustment device comprises a drive unit such as a motor that supplies power to the rack and pinion drive when the latch mechanism is released. For example, the drive unit is connected to a control unit, but when the latch mechanism is released, a signal is sent to the drive unit to start supplying power to the rack and pinion drive for the front-back movement of the upper track.

[0033] In another possible embodiment, the drive unit is coupled relative to the upper track. For example, the drive unit is positioned on the upper surface of the upper track. Optionally, the drive unit is positioned laterally away from the track. In detail, the drive unit is coupled to the upper track via bars, rods, etc. Depending on the assembly space, the arrangement of the drive unit can be variably adapted. For example, a laterally positioned drive unit can be easily covered.

[0034] In further possible embodiments, the adjustment device includes a clutch unit that connects or disconnects a drive unit and a rack and pinion drive when a latch mechanism is released or latched. For example, the clutch unit is positioned between the drive unit and the rack and pinion drive. More specifically, the clutch unit connects or disconnects the drive unit to or from the pinion. More specifically, the clutch unit is configured to connect or disconnect the drive unit and the rack and pinion drive when power is applied to or interrupted to actuate an electromechanical device.

[0035] The present invention also relates to a seat, particularly a vehicle seat, comprising at least a seat pan, a backrest, and a longitudinal adjuster according to any of the embodiments described above. More specifically, the longitudinal adjuster is configured to move at least the seat pan to an easy-entry position.

[0036] In another embodiment, the backrest is movable relative to the seat pan while moving the seat pan to an easy-entry position and then back to a comfortable position for use. [Brief explanation of the drawing]

[0037] This disclosure will be better understood from the detailed description and accompanying drawings provided below herein. These drawings are given only as examples and are therefore not limiting to this disclosure. [Figure 1A] This shows a side view of one embodiment of a seat having a front-to-rear adjuster, particularly a vehicle seat. [Figure 1B] A perspective view of one embodiment of a longitudinal adjuster having two pairs of tracks is shown. [Figure 2A] At least a portion of one embodiment of a longitudinal adjuster, more specifically a cross-sectional view of one pair of tracks, is shown. [Figure 2B] At least a portion of one embodiment of a longitudinal adjuster, in detail a top view of one pair of tracks, is shown. [Figure 2C] At least a portion of one embodiment of a longitudinal adjuster, more specifically a side view of one pair of tracks, is shown. [Figure 3] This shows a side view of one embodiment of the latch mechanism of a front-to-back adjuster. [Figure 4] Figures 4A and 4B show another embodiment of the longitudinal adjuster, specifically a side view and a cross-sectional view of one track pair.

[0038] Corresponding parts are indicated by the same symbols in all figures. [Modes for carrying out the invention]

[0039] Figure 1A shows a side view of one embodiment of a seat 1, particularly a vehicle seat, having a longitudinal adjuster 2 with a track device TA. The track device TA comprises at least one track pair PT1.

[0040] Figure 1B shows a perspective view of one embodiment of the longitudinal adjuster 2, in which the track device TA comprises two pairs of tracks PT1 and PT2 arranged parallel to each other.

[0041] To better understand the subsequent descriptions of seat 1 and longitudinal adjuster 2, the coordinate system is shown in a further diagram. The coordinate system includes the longitudinal axis x, the lateral axis y, and the vertical axis z relative to the vehicle. Seat 1 is positionable at least with respect to the longitudinal axis x.

[0042] The seat 1 comprises a seat pan 1.1 and a backrest 1.2 connected to the seat pan 1.1. For example, the backrest 1.2 is movable, and more specifically, tiltable, relative to the seat pan 1.1.

[0043] The seat 1 is equipped with an easy-entry function, such that the seat pan 1.1 together with the backrest 1.2 can be moved in the longitudinal direction along a travel path W between at least two positions SP1 and SP2 by a longitudinal adjuster 2. In detail, the seat 1 can be moved between a comfortable use position SP1 and an easy-entry position SP2. In the easy-entry position SP2, easier access to the second row of seats and / or the rear compartment is possible.

[0044] The longitudinal adjuster 2 is provided for the longitudinal movement of the seat 1 and comprises two track pairs, PT1 and PT2, as shown in Figure 1B. Each track pair, PT1 and PT2, comprises two tracks, 3 and 4.

[0045] At least one of the track pairs PT1 and PT2 comprises a first lower track 3 and a second upper track 4 slidably connected to the lower track 3. The lower track 3 is fixed to a vehicle structure such as the vehicle floor. In the illustrated embodiment, the upper track 4 is fixed to a seat pan 1.1 and moves the seat pan 1.1 between a comfortable use position SP1 and an easy entry position SP2.

[0046] For example, the tracks PT1 and PT2 are positioned on each side of the sheet pan 1.1. This allows the tracks PT1 and PT2 to be connected to each other via the mounting rod 5 for simultaneous forward and backward movement of the sheet 1 when at least one of the tracks PT1 and PT2 is operated for forward and backward movement.

[0047] Furthermore, the front-to-rear adjuster 2 includes at least one latch mechanism 6 for engaging the upper track 4 with the lower track 3. In addition, the front-to-rear adjuster 2 includes at least one adjustment device 7 for adjusting the upper track 4 in the front-to-rear direction relative to the lower track 3.

[0048] For example, the latch mechanism 6 and the adjustment device 7 are located on one or both of the track pair PT1 and PT2. In the illustrated embodiment, the latch mechanism 6 and the adjustment device 7 are located relative to one of the track pair, PT1.

[0049] Furthermore, the front-rear adjuster 2 includes an electromechanical device 8 connected to the latch mechanism 6, and the electromechanical device 8 is configured to bias the latch mechanism 6 between the released position RP and the latched position LP, as shown in Figure 2A, and when the latch mechanism 6 is released, the adjustment device 7 is actuated to drive the upper track 4 in the front-rear direction relative to the lower track 3.

[0050] For example, the electromechanical device 8 is configured as a solenoid. For example, when power or current is applied to the electromechanical device 8, it is actuated to bias the latch mechanism 6 from the open position RP to the latched position LP. This means that the electromechanical device 8 switches from a passive state where no power or current is applied to an active state where power or current is applied, and vice versa. In this way, the electromechanical device 8 acts on the latch mechanism 6 in each state.

[0051] In the illustrated embodiment, in the passive state of the electromechanical device 8, the latch mechanism 6 is held in its latch position LP. In the active state of the electromechanical device 8, the latch mechanism 6 is held in its release position RP. Specifically, the electromechanical device 8 prevents the latch mechanism 6 from moving to its release position RP or to its latch position LP.

[0052] To signal the start of activating the adjustment device 7 in accordance with the state of the electromechanical device 8, at least the adjustment device 7 and the electromechanical device 8 are connected to a control unit 9, such as a sensor array.

[0053] For example, the electromechanical device 8 is actuated by an actuation element (not shown). Thus, the actuation element can be connected to the electromechanical device 8 via a control unit 9. For example, the actuation element is located inside the vehicle, for example, in the dashboard area or the rear compartment area and / or on the corresponding seat 1. Thus, the actuation element may be a button, lever, switch or any other operable element. In detail, by operating the actuation element, the electromechanical device 8 receives a signal that biases the latch mechanism 6 from the latch position LP to the release position RP. When the latch mechanism 6 is released, the adjustment device 7 receives a signal that the latch mechanism 6 is released and the upper track 4 is ready to move. The adjustment device 7 is then actuated to drive the upper track 4 relative to the lower track 3, in detail along the travel path W.

[0054] In detail, the adjustment device 7 is configured as an external transmission device for tracks 3 and 4. This means that the adjustment device 7 is positioned substantially outside the contours of tracks 3 and 4. For example, the adjustment device 7 is positioned substantially between tracks PT1 and PT2.

[0055] According to one embodiment, the adjustment device 7 includes a rack and pinion drive 7.1. In the illustrated embodiment, the rack and pinion drive 7.1 is located to the side of tracks 3 and 4. The rack and pinion drive 7.1 is power-driven. Thus, the adjustment device 7 includes a drive unit 7.2 configured to supply power to the rack and pinion drive 7 for forward and backward movement.

[0056] Furthermore, the adjustment device 7 includes a clutch unit 7.3 that connects or disconnects the drive unit 7.2 and the rack and pinion drive 7.1 when the latch mechanism 6 is released or locked. For example, the clutch unit 7.3 is positioned between the drive unit 7.2 and the rack and pinion drive 7.1. More specifically, the clutch unit 7.3 is configured to connect or disconnect the drive unit 7.2 and the rack and pinion drive 7.1 when power is applied to or interrupted to actuate the electromechanical device 8.

[0057] For example, the adjustment device 7 is configured to stop driving when the latch mechanism 6 reaches the endstop positions EP1, EP2. Additionally or optionally, the adjustment device 7 is configured to stop driving when the upper track 4 reaches the detected endstop positions EP1, EP2. For example, the adjustment device 7 stops driving when the latch mechanism 6 is positioned at its defined latch position LP and, in detail, locked. This causes the latch mechanism 6 and therefore the upper track 4 to be at the endstop position EP1 or EP2. A signal to stop the adjustment device 7 can be initiated after the adjustment device 7 detects an increase in resistance it has experienced and / or when it detects the latch mechanism 6 and / or the upper track 4 at the defined endstop positions EP1 or EP2.

[0058] The rear end stop position EP1, which corresponds to, for example, the comfortable seat position SP1 of the seat 1, is indicated by the latch position LP of the latch mechanism 6. When the latch mechanism 6 is detected to be in the latch position LP, the adjustment device 7 stops driving.

[0059] The forward endstop position EP2, for example, the forward endstop position corresponding to the easy entry position SP2 of seat 1, is indicated by the endstop 10 located in the forward area of ​​tracks 3 and 4. When the released latch mechanism 6 contacts the endstop 10, the adjustment device 7 stops driving.

[0060] Additionally, or optionally, the upper track 4 is provided with a corresponding endstop portion, and when the corresponding endstop portion contacts the endstop 10, the adjustment device 7 stops driving. For example, the corresponding endstop portion of the upper track 4 is formed as a flap, tab, or bracket element located in the rear region of the upper track 4.

[0061] Figures 2A to 2C show at least a portion of an embodiment of the longitudinal adjuster 2, more specifically a cross-sectional view, top view, and side view of one track pair PT2. Specifically, Figure 2A shows a cross-sectional view of the track pair PT2, Figure 2B shows a top view of the track pair PT2, and Figure 2C shows a side view of the track pair PT2.

[0062] For example, latch mechanism 6 is a general latch mechanism 6. The latch mechanism 6 is substantially located within the track contour formed by the lower track 3 and the upper track 4. In detail, the lower track 3 and the upper track 4 are formed such that they alternately engage with each other around each other to form the track contour. Thus, the lower track 3 and the upper track 4 have a substantially U-shaped contour. In detail, the lower track 3 and the upper track 4 engage with each other at the inwardly and outwardly folded side portions 3.1, 4.1, forming a closed track contour and a defined assembly space AS. The assembly space AS is a cavity that extends in the front-rear direction of at least each track pair PT1, PT2.

[0063] For example, the latch mechanism 6 includes a latch plate 6.1 comprising a latch lever, a claw, or a catch. The latch plate 6.1 comprises a plurality of latch elements 6.2, such as protruding elements such as toothed elements that protrude from the latch plate 6.1. The latch elements 6.2 protrude through an opening 4.2 formed in the upper track 4. The opening 4.2 is provided in the side portion 4.1. The opening 4.2 extends vertically in the side portion 4.1.

[0064] Furthermore, to latch the upper track 4 to the lower track 3, the latch element 6.2 protrudes into an opening 3.2 formed in the lower track 3. The opening 3.2 is provided in the side portion 3.1, more specifically in the rear region of the lower track 3, to lock the latch mechanism 6 to the rear endstop position EP1, i.e., for the seat 1's comfortable use position SP1. The opening 3.2 extends vertically in the side portion 3.1. In further embodiments, these openings 3.2 are provided in the side portion 3.1 in the front region of the lower track 3 to lock the latch mechanism 6 to the front endstop position EP2, i.e., for the seat 1's easy entry position SP2.

[0065] In detail, the latch mechanism 6 is movably positioned within the track contour. In the illustrated embodiment, the latch mechanism 6 is movably positioned vertically. For example, the latch mechanism 6 is positioned within the assembly space AS. In detail, the latch plate 6.1 is positioned horizontally within the assembly space AS. By moving the latch plate 6.1 downward, the latch element 6.2 is released from the opening 3.2 of the lower track 3. In the latched state, the latch plate 6.1 is in the upper vertical position indicated as the latch position LP, also shown in Figure 3. In the released state, the latch plate 6.1 is in the lower vertical position indicated as the released position RP, also shown in Figure 3.

[0066] The electromechanical device 8 is positioned on the upper track 4 and directly connected to the latch mechanism 6. For example, the electromechanical device 8 is positioned on the upper surface 4.3 of the upper track 4 and above the latch mechanism 6. The upper surface 4.3 connects to the side portion 4.1, forming a U-shaped upper track 4.

[0067] The latch mechanism 6 comprises an actuation pin 6.3, a rod, or a bolt. The actuation pin 6.3 is guided through an upper opening 4.4 formed in the upper surface 4.3 of the upper track 4. The actuation pin 6.3 is connected to an electromechanical device 8, and therefore to the upper track 4.

[0068] The electromechanical device 8 is configured as a solenoid having at least one electromagnetic actuator 8.1 that biases the latch mechanism 6 in one direction, and at least one spring element 8.2 that biases the latch mechanism 6 in the opposite direction. Depending on the linear vertical movement of the electromagnetic actuator 8.1 when power is applied, the spring element is either a pressure spring or a tension spring that biases the electromagnetic actuator 8.1 in one of the opposite directions when the power is removed. For example, the electromagnetic actuator 8.1 includes a plunger that can be moved up and down by electromagnetic force. The electromagnetic force is started by applying power to the electromechanical device 8. When the power is removed, the electromagnetic force is switched off, and the spring force returns the electromagnetic actuator 8.1 to its initial position.

[0069] In the illustrated embodiment, the electromagnetic actuator 8.1 is configured to push the latch mechanism 6 from the latched position LP to the released position RP, i.e., downward, when power is applied. The spring element 8.2 is configured to pull the latch mechanism 6 from the released position RP to the latched position LP, i.e., upward, when power is cut off.

[0070] By activating the electromechanical device 8, the electromagnetic actuator 8.1 is biased vertically, and at the same time, the operating pin 6.3 of the latch mechanism 6 is biased downward (i.e., pushed). Note that the electromechanical device 8 and the latch mechanism 6 can be configured and operated as a clutch device.

[0071] The rack and pinion drive 7.1 of the adjustment device 7 comprises a toothed rack 7.1.1 fixed relative to the lower track 3 and a pinion 7.1.2 fixed relative to the upper track 4.

[0072] For example, the toothed rack 7.1.1 extends partially along the length of the lower track 3. More specifically, the toothed rack 7.1.1 is positioned to extend substantially parallel to the lateral portions 3.1 and 4.1 of tracks 3 and 4. The pinion 7.1.2 is configured to be power-driven and engages with the toothed rack 7.1.1 to move along the longitudinal direction. As a result, the upper track 4 moves relative to the lower track 3 following the power-driven movement of the pinion 7.1.2.

[0073] More specifically, the clutch unit 7.3 is positioned between the drive unit 7.2 and the pinion 7.1.2 to connect or disconnect the drive unit 7.2 from the pinion 7.1.2, and to link them together.

[0074] To move seat 1 from the comfortable position SP1 to the easy entry position SP2, the electromechanical device 8 is actuated, for example, via an operating element. Power or current is applied to the electromechanical device 8, while the electromagnetic actuator 8.1 is actuated to actively push the latch mechanism 6 from the latch position LP to the release position RP. When the release of the latch mechanism 6 is detected, the clutch unit 7.3 is actuated to engage with the drive unit 7.2 and pinion 7.1.2. This causes the drive unit 7.2 to actuate the upper track 4 forward relative to the end stop 10. Upon contact with the end stop 10, the drive unit 7.2 stops driving. When it is detected that the upper track 4 has reached the forward end stop position EP2, the electromagnetic actuator 8.1 is released. This means that the power or current applied to the electromechanical device 8 is cut off. This causes the spring element 8.2 to pull the latch mechanism 6 upward so that the latch plate 6.1 presses against the side portion 3.1 of the lower track 3. Additionally, or optionally, an opening 3.2 for locking a latch element 6.2 is also provided in the forward region of the lower track 3, while the latch mechanism 6 is biased to a latch position LP at the forward endstop position EP2 of the upper track 4. The seat 1 is in the easy entry position SP2.

[0075] To move seat 1 from the easy-entry position SP2 to the comfortable-use position SP1, the electromechanical device 8 is activated and, in detail, powered again. This causes the electromagnetic actuator 8.1 to push the latch mechanism 6 downward again. When the activation of the electromechanical device 8 is detected, the clutch unit 7.3 is activated to engage with the drive unit 7.2 and pinion 7.1.2. This causes the drive unit 7.2 to rotate the pinion 7.1.2 in the reverse direction. The possible directions of rotation of the pinion 7.1.2 are indicated by arrow Ro in Figures 2A to 2C. The upper track 4 is moved backward until it reaches the designated position DP shown in Figure 3. The designated position DP is a predetermined position of the latch mechanism 6, in particular with respect to the latch element 6.2. In detail, the designated position DP is the position of the latch mechanism 6 prior to the latch position LP. When the latch mechanism 6, particularly its latch element 6.2 and / or latch plate 6.1, reaches a predetermined designated position DP, this taken position of the latch mechanism 6 is transmitted to the power supply of the electromechanical device 8 via the control unit 9. When it is detected that the latch mechanism 6 is in the designated position DP, the power supplied to the electromechanical device 8 is switched off, or more precisely, cut off. Subsequently, the electromagnetic actuator 8.1 is turned off, while the spring element 8.2 is made capable of pulling the latch mechanism 6 to the latch position LP. The drive unit 7.2 is configured to continue driving, for example, for a predetermined distance after the designated position DP is detected, and to stop driving when the latch mechanism 6 is biased to the latch position LP, which is at the rear end stop position EP1 of the upper track 4. The seat 1 is in the comfortable position SP1.

[0076] Figure 3 shows a side view of one embodiment of the latch mechanism 6 of the front-rear adjuster 2. In detail, the latch mechanism 6 is in a designated position DP, and at the designated position DP, the power to the electromechanical device 8 is turned off so that the latch mechanism 6 can be automatically energized to its latch position LP.

[0077] Figures 4A and 4B show another embodiment of the longitudinal adjuster 2, specifically a side view and a cross-sectional view of one track versus PT2.

[0078] In the illustrated embodiment, the electromechanical device 8 is positioned away from the upper track 4 and is connected to the latch mechanism 6 via a towel bar 11. The towel bar 11 moves around a pivot axis PA located on the upper track 4. The towel bar 11 is connected to a towel bar bracket 11.1 fixedly positioned on the upper surface of the upper track 4. When the electromechanical device 8 is actuated and power is applied, the electromagnetic actuator 8.1 pushes the towel bar 11 upward so that the other end of the towel bar 11 connected to the latch mechanism 6 is moved downward. This biases the latch mechanism 6 from the latch position LP to the release position RP. The upper track 4 is then released and moved relative to the lower track 3. Power is cut off to bias the latch mechanism 6 back from the release position RP to the latch position LP. The electromechanical device 8 returns to its default position. This causes the spring element 8.2 to pull the towel bar 11 downward, while the latch mechanism 6 is pulled upward from the release position RP to the latch position LP. For example, the implementation space is improved.

[0079] In Figure 4B, the drive unit 7.2 is connected relative to the upper track 4. More specifically, the drive unit 7.2 is positioned laterally away from tracks 3 and 4. More specifically, the drive unit 7.2 is connected to the upper track 3 via a bar 12, rod, etc., and moves in the longitudinal direction together with the pinion 7.1.2 and the upper track 4. For example, the mounting bracket 13 for connecting the drive unit 7.2 to the upper track 4 has one end connected to the upper surface of the upper track 4, and the other end of the mounting bracket 13 extends vertically to provide a mounting area for the drive unit 7.2. For example, the drive unit 7.2 is positioned in the space between two tracks, PT1 and PT2. This improves the mounting space. Also, the drive unit 7.2 is protected from external influences. [Explanation of Symbols]

[0080] 1 sheet 1.1 Sheet pan 1.2 Backrest 2. Front-to-back adjuster 3 tracks, lower track 3.1 Side part 3.2 Aperture 4 tracks, upper track 4.1 Side part 4.2 Aperture 4.3 Top side 4.4 Top opening 5. Mounting rod 6. Latch mechanism 6.1 Latch Plate 6.2 Latch Element 6.3 Actuating Pin 7 Adjustment devices 7.1 Rack and pinion drive 7.1.1 Toothed rack 7.1.2 Pinion 7.2 Drive Unit 7.3 Clutch Unit 8. Electromechanical Devices 8.1 Electromagnetic Actuator 8.2 Spring elements 9 Control Unit 10 End Stops 11 Towel Bar 11.1 Towel bar bracket 12 bars 13 Mounting bracket AS Assembly Space DP specified position EP1, EP2 End Stop Positions PA Swivel Axis PT1, PT2 Track vs. Ro, in particular, the arrow indicating the direction of rotation. RP release position LP latch position SP1, SP2 position TA Track Equipment W Travel Path x Anteroposterior axis y horizontal axis z Vertical axis

Claims

1. A front-to-back adjuster (2) for a seat (1), A fixed lower track (3), An upper track (4) is slidably connected to the lower track (3), An adjustment device (7) for adjusting the upper track (4) in the front-rear direction relative to the lower track (3), A latch mechanism (6) that engages the upper track (4) with the lower track (3), An electromechanical device (8) is connected relatively to the latch mechanism (6) and It has at least the following features: The electromechanical device (8) is configured to bias the latch mechanism (6) between the released position (RP) and the latched position (LP), and when the latch mechanism (6) is released, the adjustment device (7) is activated to drive the upper track (4) relative to the lower track (3). The electromechanical device (8) is configured as a solenoid having at least one electromagnetic actuator (8.1) that biases the latch mechanism (6) in one direction, and at least one spring element (8.2) that is arranged coaxially with the electromagnetic actuator (8.1) around the electromagnetic actuator (8.1) and biases the latch mechanism (6) in the opposite direction. The electromechanical device (8) is positioned on the upper track (4) and directly connected to the latch mechanism (6), The adjustment device (7) comprises a rack and pinion drive (7.1) that is at least partially arranged along the length of the tracks (3, 4), The adjustment device (7) includes a drive unit (7.2) that supplies power to the rack and pinion drive (7.1) when the latch mechanism (6) is released. A longitudinal adjuster (2) is provided, wherein both the electromechanical device (8) and the drive unit (7.2) of the adjustment device (7) are directly positioned on the upper surface of the upper track (4) and are located in the lateral center of the upper track (4).

2. The front-rear adjuster (2) according to claim 1, wherein the electromechanical device (8) is configured to bias the latch mechanism (6) from the release position (RP) to the latch position (LP) when the latch mechanism (6) and / or the upper track (4) reach a designated position (DP).

3. The front-rear adjuster (2) according to claim 1 or 2, wherein the adjustment device (7) is configured to stop driving when the latch mechanism (6) and / or the upper track (4) are in the end stop position (EP1, EP2).

4. The front-rear adjuster (2) according to any one of claims 1 to 3, wherein the rack and pinion drive (7.1) comprises at least a toothed rack (7.1.1) fixed relative to the lower track (3) and a pinion (7.1.2) fixed relative to the upper track (4).

5. The drive unit (7.2) is connected relative to the upper track (4), and is a longitudinal adjuster (2) according to any one of claims 1 to 4.

6. The front-rear adjuster (2) according to any one of claims 1 to 5, wherein the adjustment device (7) comprises a clutch unit (7.3) that connects or disconnects the drive unit (7.2) and the rack and pinion drive (7.1) when the latch mechanism (6) is released or locked.

7. A seat (1) comprising at least a seat pan (1.1), a backrest (1.2), and a front-to-back adjuster (2) according to any one of claims 1 to 6.

8. The seat (1) according to claim 7, wherein the front-rear adjuster (2) is configured to move at least the seat pan (1.1) between a comfortable position (SP1) and an easy-entry position (SP2).

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