Mechanical extension device for a movable seating unit and movable seating unit

Abstract

The utility model relates to a kind of mechanical stretching device for movable seat unit, comprising: pedestal unit, it includes a pair of pedestal longitudinal beam extending along the front-back direction of seat unit;Seat unit, it includes a pair of seat frame longitudinal beam slippable along the front-back direction of seat unit;Backrest unit pivotally connected to the rear portion of the seat unit, it at least includes backrest support, backrest connecting rod crank piece and follow-up connecting rod;And linkage connecting rod, the rear end of the linkage connecting rod is pivotally connected to the third pivot point of the backrest connecting rod, and wherein, the first connecting rod is respectively connected with the seat frame longitudinal beam and the front end of the linkage connecting rod at different pivot points, so that the activity of the leg unit relative to seat frame longitudinal beam is always synchronized with the overturning of the backrest support relative to the seat frame longitudinal beam is carried out.In addition, the utility model also relates to a movable seat unit.

Description

Technical Field

[0001] This utility model relates to a mechanical extension device for a movable seat unit, and further, to a movable seat unit including the mechanical extension device. Background Technology

[0002] Various seating units for movable seating, such as rocking chairs, swing chairs, and sofas with rocking functions, are known in the prior art. These seating units typically have a base, backrest, seat, and leg extension, and can be shifted between several different postures. However, known seating units often fail to meet the user's comfort requirements. For example, users may need to manually perform these posture shifts with considerable effort, or too many postures may be preset, requiring a lengthy shifting process to achieve the desired seating position. Clearly, this also leads to a more complex structure for the seating units, resulting in a higher risk of failure and higher manufacturing and maintenance costs. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a movable seat that is more convenient to operate, requires less space, and is more comfortable to use.

[0004] To solve the aforementioned technical problem, a mechanical extension device for a movable seat unit is provided, characterized in that the mechanical extension device comprises: a base unit fixedly placed relative to the support surface of the seat unit, which includes a pair of base longitudinal beams extending along the front-rear direction of the seat unit; a seat unit, which includes a pair of seat frame longitudinal beams slidably along the front-rear direction of the seat unit; and a backrest unit pivotally connected to the rear of the seat unit, which includes at least a backrest support, a backrest linkage crank, and a follower linkage, wherein the backrest support is attached to the backrest of the seat unit, and the backrest linkage includes a first pivot point located at its upper end and a second pivot point located in its middle. The backrest link has a pivot point and a third pivot point located at its lower end, wherein the backrest link is pivotally connected to the backrest support at the first pivot point and pivotally connected to the seat frame longitudinal beam at the second pivot point; a leg unit pivotally connected to the front of the seat unit, comprising at least one first link; and a linkage link, the rear end of which is pivotally connected to the third pivot point of the backrest link, wherein the first link is connected to the front end of the seat frame longitudinal beam and the linkage link at different pivot points, such that the movement of the leg unit relative to the seat frame longitudinal beam is always synchronized with the rotation of the backrest support relative to the seat frame longitudinal beam.

[0005] It should be noted that the leg unit can be constructed as a multi-link mechanism, and the linkage can be set between one of the first links and the backrest unit as needed.

[0006] In this embodiment, a linkage is used to achieve linkage between the backrest unit and the leg unit, meaning the backrest unit does not move backward relative to the leg unit. Therefore, when the leg unit extends forward relative to the seat unit, the backrest support flips backward, thereby enabling a direct transition between the sitting and reclining positions of the seat unit.

[0007] According to one or more embodiments of the present invention, the backrest unit is pivotally connected between the seat unit and the base unit, so that while the backrest support flips backward relative to the seat frame longitudinal beam, the seat unit slides forward relative to the base unit.

[0008] In this embodiment, the backrest unit is also linked to the seat unit, allowing the seat unit to move together with the backrest unit relative to the base unit. Specifically, when the backrest support of the backrest unit flips backward, the seat unit slides forward relative to the base unit. This avoids interference with the rear wall caused by the backrest support and its attached backrest tilting backward, thus achieving a zero-wall-adhesion design.

[0009] According to one or more embodiments of the present invention, the leg unit further includes a second link, the first link having a first end and a second end opposite to the first end, wherein the first link is pivotally connected to the second link at its first end and pivotally connected to the linkage link at its second end, wherein the pivot point of the first link and the seat frame longitudinal beam is located between the first end and the second end of the first link.

[0010] In this embodiment, when the leg unit extends or retracts relative to the seat frame unit, the rear end of the first link of the leg unit rotates about its pivot point with the seat frame longitudinal beam. This first link is pivotally connected to the linkage link, thereby synchronously causing the backrest unit to deform under the drive of the linkage link. For example, when the leg unit extends forward, the linkage link is pushed backward by the first link, causing the backrest link to pivot about its pivot point with the seat frame longitudinal beam. The upper end of the backrest link flips forward, and the upper end of the backrest support flips backward accordingly. Conversely, when the leg unit retracts and returns to its original position, the upper end of the backrest support flips forward accordingly.

[0011] According to one or more embodiments of the present invention, the crank component is pivotally connected to the upper ends of the backrest bracket, the backrest connecting rod and the follower connecting rod, and wherein the lower end of the follower connecting rod is pivotally connected to the base unit.

[0012] According to one or more embodiments of the present invention, the mechanical extension device is configured such that once the leg unit extends forward relative to the seat unit, the backrest support flips backward relative to the seat unit, and once the leg unit retracts backward relative to the seat unit, the backrest support resets and flips forward relative to the seat unit.

[0013] According to one or more embodiments of the present invention, the base longitudinal beam includes a base sliding groove, wherein the base frame longitudinal beam is slidably connected to the base sliding groove.

[0014] According to one or more embodiments of the present invention, the base groove extends at least partially at an angle relative to the horizontal plane, wherein the front end of the base groove has a greater height than the rear end.

[0015] In this embodiment, more space can be provided under the seat unit in the reclining position, which facilitates cleaning and increases the ground clearance of the leg unit, thereby allowing the height of the base portion of the seat unit to be reduced and a more compact design to be achieved.

[0016] According to one or more embodiments of the present invention, the seat frame longitudinal beam includes a top wall of the longitudinal beam and two opposing vertical walls of the longitudinal beam extending downward from the top wall of the longitudinal beam.

[0017] According to one or more embodiments of the present invention, the mechanical extension device further includes an electric drive unit, wherein the electric drive unit is configured as a linear actuator and includes a drive motor and an actuator movable relative to the drive motor.

[0018] According to one or more embodiments of the present invention, the electric drive unit is connected between the backrest unit and the leg unit.

[0019] Alternatively, the electric drive unit is connected between the base unit and the leg unit.

[0020] Alternatively, the electric drive unit is connected between the seat unit and the leg unit.

[0021] Alternatively, the electric drive unit is connected between the base unit and the linkage.

[0022] According to one or more embodiments of the present invention, the electric drive unit is configured as a push rod motor, wherein the actuator is configured as a motor push rod that is retractable relative to the drive motor.

[0023] Preferably, a backrest crossbeam is connected along the transverse direction of the seat unit between opposing backrest links, and a leg crossbeam is connected between opposing first links, wherein the drive motor is connected to the backrest crossbeam, and the motor push rod is connected to the leg crossbeam.

[0024] According to one or more embodiments of the present invention, the electric drive unit is configured as a slider motor, wherein the electric drive unit further includes a motor track fixedly connected to the drive motor, and wherein the actuator is configured as a motor slider and is capable of sliding along the motor track.

[0025] Preferably, the base unit further includes a front base beam and a rear base beam that are transversely connected between the base longitudinal beams along the seat unit, and a leg beam is connected between opposing first links, wherein the drive motor is connected to the rear base beam, the motor rail is connected to the front base beam, and the motor slider is connected to the leg beam via a motor link.

[0026] To address the aforementioned technical problem, a movable seat unit is also provided, which includes the aforementioned mechanical extension device. Attached Figure Description

[0027] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 A perspective view of a seat unit according to one embodiment of the present invention is shown schematically in a seated position.

[0029] Figure 2 schematically shown Figure 1 The diagram shows a three-dimensional view of the seat unit in a reclining position.

[0030] Figure 3 schematically shown Figure 1 The diagram shows a three-dimensional view of the seat unit positioned between a sitting position and a reclining position.

[0031] Figure 4 A partial perspective view of the backrest unit of a seat unit according to one embodiment of the present invention is shown schematically.

[0032] Figure 5 A partial perspective view of the backrest unit of a seat unit according to one embodiment of the present invention is shown schematically.

[0033] Figure 6 A partial perspective view of a seat unit according to one embodiment of the present invention is shown schematically, with the unit positioned in the center.

[0034] Figure 7 schematically shown Figure 6 The image shows a partial perspective view of the seat unit in a reclining position.

[0035] Figure 8 schematically shown Figure 6 The shown is a side view of the seat unit in a seated position;

[0036] Figure 9 schematically shown Figure 6 The side view of the seat unit shown is in the middle position;

[0037] Figure 10 schematically shown Figure 6 The shown is a side view of the seat unit in a reclining position;

[0038] Figure 11 A perspective view of a seat unit according to a second embodiment of the present invention is shown schematically.

[0039] Figure 12 A perspective view of a seat unit according to a third embodiment of the present invention is shown schematically.

[0040] Figure 13 A perspective view of a seat unit according to a third embodiment of the present invention is shown schematically.

[0041] Figure 14 schematically shown Figure 13 A perspective view of a variant of the seat unit shown; and

[0042] Figure 15 A perspective view of a seat unit according to a fourth embodiment of the present invention is shown schematically. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The term "one embodiment" or "implementation" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0045] Furthermore, it should be noted that the "front-to-back direction" mentioned in this application refers to the extension direction of the leg unit of the furniture unit, especially the seat unit. Specifically, "front" refers to the direction toward the leg unit, and "rear" refers to the direction toward the backrest unit. The "left-right direction" or "lateral direction" refers to the horizontal direction of the furniture unit, especially the seat unit, that is perpendicular to the "front-to-back direction".

[0046] Figures 1 to 3 A perspective view of a seat unit according to a first embodiment of the present invention is shown schematically. This seat unit can, for example, be constructed as a floor-standing seat unit with a metal frame.

[0047] The seat unit includes a base unit 1 fixedly placed relative to a support surface, a seat unit 2 slidable relative to the base unit 1, a backrest unit 3 connected to the rear of the seat unit 2, and a leg unit 4 slidable relative to the seat unit 2.

[0048] The seat unit is configured to switch between a sitting position and a reclining position. In the sitting position, the backrest attached to the backrest unit 3 is upright, and the leg unit 4 is retracted relative to the seat unit 2. In the reclining position, the backrest is significantly tilted back compared to the sitting position, and the leg unit 4 extends forward relative to the seat unit 2.

[0049] For example, in the case of Figure 1 In the exemplary sitting position shown, the backrest is upright and the leg unit is tucked under the seat frame; in the... Figure 2In the exemplary reclining position shown, the leg unit extends forward, the seat frame slides forward, and the backrest tilts at a greater angle.

[0050] The base unit 1 includes a generally rectangular base frame 10 and four legs 11 extending downward from the base frame 10. The legs 11 support the base frame 10, along with the entire seat unit, on a support surface for placing the seat unit, thereby "suspending" the mechanical extension device. Of course, in embodiments not shown, the legs 11 can be replaced with rotating brackets or two parallel support rails.

[0051] The base frame 10 includes two base longitudinal beams 101 extending parallel to each other in the front-rear direction of the seat unit, and a base front crossbeam 102 and a base rear crossbeam 103 transversely connected between the two base longitudinal beams 101. The base front crossbeam 102 is connected at its end to the front end of each base longitudinal beam 101, and the base rear crossbeam 103 is connected at its end to the rear end of each base longitudinal beam 101. Each base longitudinal beam 101 includes a base groove 1010 extending in the front-rear direction of the seat unit.

[0052] In a preferred embodiment, the base slide 1010 extends upward at an angle along the front-rear direction of the seat unit. Consequently, the front end of the base slide 1010 has a greater height than the rear end.

[0053] In one embodiment, the base groove 1010 on the base longitudinal beam 101 includes at least two groove sections extending at different angles relative to the horizontal plane, namely a first groove section 1010a located at the front and a second groove section 1010b located at the rear, and the angle between the first groove section 1010a and the horizontal plane is greater than the angle between the second groove section 1010b and the horizontal plane. That is, the first groove section 1010a is inclined at a larger angle than the second groove section 1010b. The first groove section 1010a and the second groove section 1010b can be constructed as two independent grooves. Alternatively, the first groove section 1010a and the second groove section 1010b can also be constructed together as a continuous groove.

[0054] The seat unit 2 is used to attach a seating section (not specifically shown). The seat unit 2 includes two seat frame longitudinal beams 21 extending parallel to each other in the front-rear direction of the seat unit, and a front seat frame crossbeam 22 and a rear seat frame crossbeam 23 transversely connected between the two seat frame longitudinal beams 21. The two seat frame longitudinal beams 21 are respectively slidably engaged with two base slide grooves 1010 of the base frame 10 of the base unit 1, thereby enabling the seat unit 2 to slide back and forth relative to the base unit 1 in the front-rear direction of the seat unit.

[0055] In a preferred embodiment, when the base slide 1010 extends upward at an upward angle along the front-rear direction of the seat unit, the seat frame unit 2 can slide forward relative to the base unit 1 along the front-rear direction of the seat unit while also being lifted upward.

[0056] The rear part of the seat unit 2 is connected to the backrest unit 3. The backrest unit 3 includes a backrest bracket 31, a backrest connecting rod 32, a crank 33, and a follower connecting rod 34.

[0057] like Figure 4 and Figure 5 As shown, the upper part of the backrest bracket 31 is fixedly connected to the backrest (not specifically shown). A backrest connecting rod 32 is connected between the lower end of the backrest bracket 31 and the rear part of the seat frame longitudinal beam 21, and a crank 33 is connected between the rear end of the backrest bracket 31 and the seat frame longitudinal beam 21.

[0058] The backrest link 32 is generally L-shaped and includes a first pivot point P1 at its upper end, a second pivot point P2 in its middle, and a third pivot point P3 at its lower end. The upper end of the backrest link 32 is pivotally connected to the lower end of the backrest bracket 31 at the first pivot point P1, and the middle part of the backrest link 32 is pivotally connected to the rear extension 210 of the seat frame longitudinal beam 21 at the second pivot point P2. The rear extension 210 can be an integral part of the seat frame longitudinal beam 21, or it can be a part fixedly connected to the seat frame longitudinal beam 21, for example, by welding or riveting.

[0059] The crank member 33 includes three pivot points: a fourth pivot point P4, a fifth pivot point P5, and a sixth pivot point P6. The fourth pivot point P4 is located at the upper end of the crank member 33, the fifth pivot point P5 at its lower end, and the sixth pivot point P6 in its middle. The crank member 33 is pivotally connected to the rear end of the backrest support 31 at the fourth pivot point P4 via its upper end; it is pivotally connected to the upper end of the follower link 34 at the fifth pivot point P5 via its lower end; and it is pivotally connected to the seat frame longitudinal beam 21, such as the rear extension 210, at the sixth pivot point P6 via its middle portion, thereby pivotally connecting to the rear of the seat unit 2. The sixth pivot point P6 is located further rearward than the second pivot point P2, meaning it is farther from the leg unit 4 when viewed in the front-rear direction of the seat unit. The lower end of the follower link 34 is pivotally connected to the rear of the base unit 1. In one embodiment, a backrest crossbeam 35 may be fixedly connected between opposing follower links 34. This backrest crossbeam 35 is closer to the leg unit 4 than the base rear crossbeam 103.

[0060] Thus, a four-bar linkage is formed by the backrest support 31, backrest connecting rod 32, seat frame longitudinal beam 21, and crank component 33. When this four-bar linkage deforms, the backrest attached to it tilts backward or forward.

[0061] A leg unit 4 is provided at the front of the seat unit 2. The leg unit 4 is constructed as a multi-link mechanism and is configured to attach a footstool, which is not specifically shown in the figure.

[0062] like Figure 3 As shown, the leg unit 4 includes a first link 41, a second link 42, a third link 43, and a fourth link 44, and a connecting rod 45 for attaching a footstool (not specifically shown). The front end of the first link 41 is rotatably connected to the rear end of the second link 42, and the front end of the third link 43 is rotatably connected to the rear end of the fourth link 44. The rear part of the first link 41 is pivotally connected to the front part of the seat frame longitudinal beam 21 at an eighth pivot point P8, and the rear end of the third link 43 is pivotally connected to the front part of the seat frame longitudinal beam 21. The eighth pivot point P8 between the first link 41 and the seat frame longitudinal beam 21 is located behind the pivot point between the third link 43 and the seat frame longitudinal beam 21. The footstool is rotatably connected to the front ends of the second link 42 and the fourth link 44 via the connecting rod 45. Along the transverse direction of the seat unit, a leg crossbeam 46 is connected between one of the links of the opposing leg units 4, for example, between the first links 41. When the leg unit 4 is deployed, the third link 43 extends further forward than the first link 41.

[0063] To enable the linkage between the backrest unit 3 and the leg unit 4, a linkage link 6 is provided between the backrest unit 3 and the leg unit 4.

[0064] like Figure 6 and Figure 7 As shown, in this embodiment, the rear end of the linkage 6 is pivotally connected to the third pivot point P3 at the lower end of the backrest linkage 32, and the front end of the linkage 6 is pivotally connected to the rear end of the first linkage 41 of the leg unit 4 at the seventh pivot point P7. Here, the first linkage 41 is pivotally connected to the second linkage 42 at its first end, and its second end, which is opposite to the first end, is pivotally connected to the linkage 6 at the seventh pivot point P7. The eighth pivot point P8, that is, the pivot point between the first linkage 41 and the seat frame longitudinal beam 21, is located between the first end and the second end of the first linkage 41.

[0065] However, in a feasible embodiment not shown, the front end of the linkage 6 can also be pivotally connected to the rear end of the third link 43 of the leg unit 4. Accordingly, the dressing point of the third link 43 and the seat frame longitudinal beam 21 is located between the pivot point of the third link 43 and the linkage 6 and the pivot point of the third link 43 and the fourth link 44.

[0066] When the leg unit 4 extends forward, the first link 41, the second link 42, the third link 43, and the fourth link 44 unfold. The first link 41 rotates around its pivot point P8, the eighth pivot point, which is the pivot point between it and the seat frame longitudinal beam 21. Its rear end, the seventh pivot point P7, has a rearward component, thereby pushing the linkage link 6 and its rear end, the third pivot point P3, to move backward. Simultaneously, the backrest link 32 of the backrest unit 3 pivots around its pivot connection point P2, the second pivot point, which is the pivot point between it and the seat frame longitudinal beam 21. The lower end of the backrest link 32 has a rearward component, and its upper end has a forward component. As a result, the four-bar linkage consisting of the backrest support 31, the backrest link 32, the seat frame longitudinal beam 21, and the crank 33 deforms, causing the attached backrest to tilt backward.

[0067] When the leg unit 4 retracts backward, the first link 41, the second link 42, the third link 43, and the fourth link 44 converge. The first link 41 rotates in the opposite direction around the eighth pivot point P8, and its rear end, the seventh pivot point P7, has a forward component, thereby pulling the linkage link 6 and its rear end, the third pivot point P3, forward. Simultaneously, the backrest link 32 of the backrest unit 3 pivots around the second pivot point P2, with its lower end having a forward component and its upper end having a backward component. Thus, the four-bar linkage consisting of the backrest support 31, the backrest link 32, the seat frame longitudinal beam 21, and the crank 33 deforms, and the attached backrest tilts forward to return to its original position.

[0068] This achieves linkage between the backrest unit 3 and the leg unit 4. The backrest support 31 of the backrest unit 3 flips backward and forward relative to the seat unit 2 as the leg unit 4 unfolds and retracts. During this process, the follower linkage 34 of the backrest unit 3 also pivots, causing the seat frame unit 2 to move forward and backward relative to the base unit 1.

[0069] The seat unit also includes an electric drive unit 5, which is configured, for example, as a linear actuator, including a drive motor 51 and an actuator 53 movable relative to the drive motor 51.

[0070] exist Figures 1 to 3 In the illustrated embodiment, the electric drive unit 5 is configured as a push rod motor, which includes a drive motor 51 and an actuator 53 configured as a motor push rod. In this embodiment, the drive motor 51 is mounted to the backrest crossbeam 35, and the motor push rod is mounted to the leg crossbeam 46.

[0071] When the seat unit is in Figure 8 In the seated position shown, the backrest support 31 is generally upright relative to the top surface of the seat frame longitudinal beam 21, and the leg unit 4 is retracted relative to the seat unit 2, preferably retracted below the seat frame longitudinal beam 21.

[0072] When the actuator 53 of the electric drive unit 5 moves outward relative to the drive motor 51, the leg unit 4 unfolds relative to the seat unit 2 via the leg crossbeam 46. Simultaneously, the backrest unit 3 deforms under the action of the linkage 6, causing the backrest support 31 to flip backward relative to the seat frame longitudinal beam 21. The seat frame longitudinal beam 21 also moves forward relative to the base unit 1 synchronously with the backrest unit 3 and the leg unit 4. While sliding forward relative to the base unit 1 along the front-rear direction of the seat unit, the seat frame longitudinal beam 21 also lifts upward with its front portion. This achieves... Figure 10 The lying position shown.

[0073] In such Figure 10 In the reclining position shown, compared to the sitting position, the top surface of the seat frame longitudinal beam 21 forms a larger angle with the horizontal plane in the reclining position. During this process, on the one hand, the seat unit 2 itself moves forward, and on the other hand, the backrest support 31 also moves forward relative to the seat frame longitudinal beam 21 with the help of the linkage between the backrest connecting rod 32 and the crank 33. Therefore, the backrest support 31 has a forward trajectory as a whole, with the rearmost end and the top of the backrest support 31 moving significantly forward, thus achieving "zero wall contact". The leg unit 4 extends forward and upward with the seat unit 2, thus achieving a "zero gravity" posture.

[0074] Figure 9 This shows that from Figure 8 The sitting position shown is the same as Figure 10 The middle position between the shown lying positions.

[0075] exist Figure 11 In the second embodiment shown, the electric drive unit 5 is also configured as a push rod motor, which includes a drive motor 51 and an actuator 53 configured as a motor push rod. In this embodiment, the drive motor 51 is mounted to the rear crossbeam 103 of the base, and the motor push rod is mounted to the leg crossbeam 46.

[0076] exist Figure 12 In the third embodiment shown, the electric drive unit 5 is also configured as a push rod motor, which includes a drive motor 51 and an actuator 53 configured as a motor push rod. In this embodiment, the drive motor 51 is mounted to the rear crossbeam 23 of the seat frame, and the motor push rod is mounted to the leg crossbeam 46.

[0077] exist Figure 13In the fourth embodiment shown, the electric drive unit 5 is configured as a slider motor, which includes a drive motor 51, a motor track 52 fixed relative to the drive motor 51, an actuator 53 configured as a motor slider, and a motor connecting rod 54, the motor slider being slidable relative to the motor track. In this embodiment, the drive motor 51 is mounted to the rear crossbeam 103 of the base, the free end of the motor track opposite to the drive motor 51 is mounted to the front crossbeam 102 of the base, the front end of the motor connecting rod 54 is connected to the leg crossbeam 46, and the rear end of the motor connecting rod 54 is connected to the motor slider.

[0078] In this embodiment, when the actuator 53 of the electric drive unit 5, configured as a motor slider, moves away from the drive motor 51 along the motor track 52, the leg unit 4 unfolds relative to the seat unit 2 via the leg crossbeam 46. Simultaneously, the backrest unit 3 deforms under the action of the linkage 6, causing the backrest support 31 to flip backward relative to the seat frame longitudinal beam 21. The seat frame longitudinal beam 21 also moves forward relative to the base unit 1 synchronously with the backrest unit 3 and the leg unit 4. While sliding forward relative to the base unit 1 along the front-rear direction of the seat unit, the seat frame longitudinal beam 21 also lifts upward with its front portion. This achieves the desired effect. Figure 8 The sitting position shown Figure 10 The lying position shown.

[0079] Figure 14 A variant of this embodiment is illustrated schematically. The seat frame longitudinal beam 21 of the seat unit 2 can have an L-shaped or U-shaped cross-section. In this embodiment, the seat frame longitudinal beam 21 is constructed with a U-shaped cross-section, wherein the seat frame longitudinal beam 21 includes an upward-facing longitudinal beam top wall 211 and two opposing longitudinal beam vertical walls 212 extending downward from the longitudinal beam top wall 211. This seat frame longitudinal beam 21 with a U-shaped cross-section can directly engage with the seat to be installed via its outwardly flared longitudinal beam vertical walls 212, thereby achieving a particularly convenient and reliable installation process.

[0080] exist Figure 15 In the fifth embodiment shown, the electric drive unit 5 is also configured as a push rod motor, which includes a drive motor 51 and an actuator 53 configured as a motor push rod. In this embodiment, a linkage beam 61 is provided along the transverse direction of the seat unit between opposing linkage links 6, and both ends of the linkage beam 61 are fixedly connected to the linkage beam 61. The drive motor 51 is mounted to the rear crossbeam 23 of the seat frame, and the motor push rod is mounted to the linkage beam 61.

[0081] In this embodiment, when the actuator 53 of the electric drive unit 5 moves closer to the drive motor 51, it pulls the linkage 61 backward, thereby causing the leg unit 4 to unfold relative to the seat unit 2. Simultaneously, the backrest unit 3 deforms under the action of the linkage 6, causing the backrest support 31 to flip backward relative to the seat frame longitudinal beam 21. The seat frame longitudinal beam 21 also moves forward relative to the base unit 1 synchronously with the backrest unit 3 and the leg unit 4. While sliding forward relative to the base unit 1 along the front-rear direction of the seat unit, the seat frame longitudinal beam 21 also lifts upward with its front portion. This achieves the desired effect. Figure 8 The sitting position shown Figure 10 The lying position shown.

Claims

1. A mechanical extension device for a movable seat unit, characterized in that, The mechanical extension device includes: A base unit fixedly placed relative to the support surface of the seat unit includes a pair of base longitudinal beams extending in the front-rear direction of the seat unit; The seat unit includes a pair of seat frame longitudinal beams that can slide along the front-rear direction of the seat unit; A backrest unit pivotally connected to the rear of the seat unit includes at least a backrest support, a backrest linkage crank, and a follower linkage. The backrest support is attached to the backrest of the seat unit. The backrest linkage includes a first pivot point at its upper end, a second pivot point in its middle, and a third pivot point at its lower end. The backrest linkage is pivotally connected to the backrest support at the first pivot point and pivotally connected to the seat frame longitudinal beam at the second pivot point. A leg unit pivotally connected to the front of the seat unit, comprising at least one first link; and A linkage link is provided, the rear end of which is pivotally connected to the third pivot point of the backrest link. The first link is connected to the front end of the seat frame longitudinal beam and the linkage link at different pivot points, so that the movement of the leg unit relative to the seat frame longitudinal beam and the rotation of the backrest support relative to the seat frame longitudinal beam are always synchronized.

2. The mechanical extension device according to claim 1, characterized in that, The backrest unit is pivotally connected between the seat unit and the base unit, such that while the backrest support flips backward relative to the seat frame longitudinal beam, the seat unit slides forward relative to the base unit.

3. The mechanical extension device according to claim 1 or 2, characterized in that, The leg unit further includes a second link, the first link having a first end and a second end opposite to the first end, wherein the first link is pivotally connected to the second link at its first end and pivotally connected to the linkage link at its second end, wherein the pivot point of the first link and the seat frame longitudinal beam is located between the first end and the second end of the first link.

4. The mechanical extension device according to claim 1 or 2, characterized in that, The crank component is pivotally connected to the upper ends of the backrest bracket, the backrest link, and the follower link, respectively, and the lower end of the follower link is pivotally connected to the base unit.

5. The mechanical extension device according to claim 1 or 2, characterized in that, The mechanical extension device is configured such that once the leg unit extends forward relative to the seat unit, the backrest support flips backward relative to the seat unit, and once the leg unit retracts backward relative to the seat unit, the backrest support returns to its forward-returning position relative to the seat unit.

6. The mechanical extension device according to claim 3, characterized in that, The base longitudinal beam includes a base sliding groove, wherein the seat frame longitudinal beam is slidably connected to the base sliding groove.

7. The mechanical extension device according to claim 6, characterized in that, The base groove extends at least partially at an angle relative to the horizontal plane, wherein the front end of the base groove has a greater height than the rear end.

8. The mechanical extension device according to claim 1 or 2, characterized in that, The seat frame longitudinal beam includes a top wall of the longitudinal beam and two opposing vertical walls of the longitudinal beam extending downward from the top wall of the longitudinal beam.

9. The mechanical extension device according to claim 2, characterized in that, The mechanical extension device further includes an electric drive unit, wherein the electric drive unit is configured as a linear actuator and includes a drive motor and an actuator movable relative to the drive motor.

10. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is connected between the backrest unit and the leg unit.

11. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is connected between the base unit and the leg unit.

12. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is connected between the seat unit and the leg unit.

13. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is connected between the base unit and the linkage.

14. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is configured as a push rod motor, wherein the actuator is configured as a motor push rod that is retractable relative to the drive motor.

15. The mechanical extension device according to claim 14, characterized in that, A backrest crossbeam is connected between opposing backrest links along the transverse direction of the seat unit, and a leg crossbeam is connected between opposing first links, wherein the drive motor is connected to the backrest crossbeam, and the motor push rod is connected to the leg crossbeam.

16. The mechanical extension device according to claim 9, characterized in that, The electric drive unit is configured as a slider motor, and the electric drive unit further includes a motor track fixedly connected to the drive motor, wherein the actuator is configured as a motor slider and is capable of sliding along the motor track.

17. The mechanical extension device according to claim 16, characterized in that, The base unit also includes a front base beam and a rear base beam that are laterally connected between the base longitudinal beams along the seat unit, and a leg beam is connected between opposing first links. The drive motor is connected to the rear base beam, the motor rail is connected to the front base beam, and the motor slider is connected to the leg beam via a motor link.

18. A movable seat unit, characterized in that, It includes the mechanical extension device as described in any one of the preceding claims.

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