Movable seat unit and mechanical stretching device thereof

Abstract

The utility model relates to a mechanical stretching device for a movable seat unit, which comprises a base unit fixedly arranged relative to the ground, and the base unit comprises a sliding groove piece with a first sliding groove section and a second sliding groove section; the seat frame comprises at least one roller; a leg stretching device; the electric driving unit at least comprises a motor head, a motor sliding rail, a motor sliding block and a motor connecting rod, the motor head is fixedly connected to the base unit, the motor sliding rail, the motor sliding block and the motor connecting rod are fixedly arranged below the seat frame and on the base unit, and the electric driving unit can drive the seat unit to be converted between the sitting posture position and the lying posture position. The first chute section is inclined upwards to a greater extent relative to the horizontal plane than the second chute section, so that in the lying position, the seat frame slides forwards relative to the base unit, and the front end of the seat frame is raised upwards to a greater extent than the rear end. In addition, the utility model further relates to a seat unit.

Description

Technical Field

[0001] The utility model relates to a mechanical extension device for a movable seat unit and a movable seat unit comprising the mechanical extension device. Background Art

[0002] In the prior art, there are many kinds of movable seats, such as sofas or seats with multi-position conversion functions. With the improvement of people's living standards, the comfort requirements for sofas and seats are also increasing. In the known design, the movable seat unit is usually equipped with a mechanical extension device, which can be transformed between a sitting position, a leisure position (or a TV position) and a lying position. When the seat unit is transformed from a sitting position to a TV position, the footrest of the seat unit extends forward, and the angle between the backrest and the seat portion changes slightly. When the seat unit is transformed from a TV position to a lying position, the footrest is further forward and lifted upward than the TV position, and the backrest is significantly tilted back. In the movable seats of the existing design, the footrest is often further lifted as much as possible in pursuit of a "zero gravity" posture in the lying position, so that it is more obviously higher than the highest point of the backrest bracket. However, in the design of the prior art, a relatively complex mechanical connection mechanism is often used to achieve this purpose, such as a large number of connecting rods and a multi-stage lifting structure. This not only brings about the disadvantages of complex structure and cumbersome installation process, but also takes up a large amount of space under the seat unit, so that the seat frame must be significantly raised to free up enough space to allow cleaning under the seat unit; in addition, due to the complex connection structure, there is also a risk of functional failure, especially during the posture change of the seat, the sinking of the rear part of the seat frame causes interference with the electric drive unit. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a movable seat unit which has a simpler structure, requires a smaller placement space and has a better comfort level.

[0004] In order to solve the above technical problems, the utility model provides a mechanical extension device for a movable chair unit, characterized in that the mechanical extension device comprises: a base unit fixedly arranged relative to the ground, the base unit is used to movably support the mechanical extension device above the ground, wherein the base unit comprises a slide member with a first slide section and a second slide section; a seat frame, which comprises at least one roller, wherein the sliding of the seat frame relative to the base unit is achieved by the mutual cooperation of the slide member and the roller; a leg extension device pivotally connected to the front part of the seat frame; and an electric drive unit, which at least comprises a fixed connection A motor head connected to the base unit, a motor rail fixedly arranged on the base unit below the seat frame, a motor slider capable of sliding along the motor rail, and a motor connecting rod connected between the motor slider and the leg extension device or the seat frame. The seat unit can be driven to change between a sitting position and a lying position through the electric drive unit, wherein the first slide groove section is inclined upward to a greater extent relative to the horizontal plane than the second slide groove section, so that the seat frame slides forward relative to the base unit in the lying position compared to the sitting position, and the front end of the seat frame is lifted upward to a greater extent than the rear end.

[0005] Preferably, in the sitting position, the front end of the seat frame is at a height of 25-35 cm relative to the ground. The lowest point of the base unit is at a height of 5-15 cm relative to the ground.

[0006] In order to facilitate cleaning, the bottom of the movable seat should be arranged "suspended" above the ground. In the design according to the utility model, the motor slide rail of the electric drive unit is fixedly arranged below the seat frame relative to the base unit. At the same time, the sliding of the seat frame relative to the base unit is carried out along an upward trajectory, that is, during the transformation of the seat frame from its initial state to the slide-out state, the front part of the seat frame longitudinal beam rises to a greater extent than the rear part thereof, which makes the rear part of the seat frame at least not fall during its entire forward sliding process. Thus, the interference between the electric drive unit and the seat frame during the posture change process is avoided. This allows the height of the front end of the seat frame to be appropriately lowered without obtaining sufficient space under the seat by simply raising the height of the seat frame as in the prior art. Thus, even if the seat unit, especially its base unit and seat frame, are compact in height, it can ensure that sufficient space is provided under the seat unit for cleaning equipment, such as a sweeping robot, to perform cleaning work.

[0007] Particularly preferably, the second slotted link section extends parallel to a horizontal plane. In this case, the first slotted link section extends obliquely upward relative to the horizontal plane.

[0008] However, in an alternative embodiment, the first slotted guide section and the second slotted guide section may both extend inclined upward relative to a horizontal plane, wherein the first slotted guide section has a greater inclination than the second slotted guide section.

[0009] In this embodiment, preferably, the first slide guide section extends in a straight line. Alternatively, the first slide guide section extends in a curved line.

[0010] In one embodiment, the first slide groove section and the second slide groove section are configured as a continuous slide groove. Preferably, the seat frame includes a pair of seat frame longitudinal beams extending in the front-rear direction of the seat unit, and the seat frame longitudinal beams include at least a first roller and a second roller, wherein, during the sliding movement of the seat frame relative to the base unit, the first roller rolls at least in the first slide groove section, and the second roller rolls at least in the second slide groove section.

[0011] In an alternative embodiment, the first slide groove section and the second slide groove section are respectively configured as mutually independent slide grooves. Preferably, the seat frame includes a pair of seat frame longitudinal beams extending in the front-rear direction of the seat unit, the seat frame longitudinal beams include at least a first roller and a second roller, the first roller is rollably embedded in the first slide groove section, and the second roller is rollably embedded in the second slide groove section.

[0012] Compared with the initial state of the seat frame, after the seat frame slides forward relative to the base unit, that is, in the slid-out state of the seat frame, the front end of the seat frame longitudinal beam is located in the first slide groove section with a greater height by means of the first roller, while the rear end of the seat frame longitudinal beam is located in the second slide groove section with a smaller height by means of the second roller, or is also located in the first slide groove section, but the height of the second roller is lower than that of the first roller. In this way, it is ensured that after the seat frame slides forward relative to the base unit, the seat frame is tilted upward more sharply with its front part than with its rear part.

[0013] According to the utility model, the mechanical extension device includes a backrest unit, which is pivotally connected between the base unit and the seat frame, and includes a backrest bracket, a backrest connecting rod and a crank member, wherein the backrest bracket is used to attach the backrest of the seat unit, and the backrest connecting rod includes a first pivot point located at its upper end and a second pivot point located at its lower end, wherein the backrest connecting rod is pivotally connected to the front end of the backrest bracket at the first pivot point, and is pivotally connected to the seat frame at the second pivot point, and the upper end of the crank member is pivotally connected to the rear end of the backrest bracket at a third pivot point, and the lower end of the crank member is pivotally connected to the base unit at a fourth pivot point.

[0014] Preferably, once the seat frame slides forward relative to the base unit, the angle formed by the line between the first pivot point and the second pivot point and the seat frame is reduced.

[0015] Since the backrest unit is pivotally connected between the seat frame and the base unit, and the seat frame and the base unit are slidably connected, the forward and backward sliding of the seat frame relative to the base unit will not cause the seat frame as a whole to rise or fall too much in the height direction. Different from the prior art, the seat frame according to the utility model only produces a relatively gentle height difference during the forward sliding process, which makes the backrest connecting rod not maintain a substantially same relative position with the seat frame when moving with the seat frame, but under the force of the rotation of the crank member, the backrest connecting rod moves forward with its upper end and approaches the longitudinal beam of the seat frame, so that the angle formed by the line between the first pivot point and the second pivot point and the longitudinal beam of the seat frame is reduced. This, on the one hand, drives the backrest bracket to move forward as a whole, realizing a complete "zero wall" arrangement of the seat unit, and on the other hand, makes the backrest unit approach the seat frame to a greater extent during the forward movement of the seat frame, realizing a "zero back rubbing" design. In addition, since the forward sliding of the seat frame relative to the base unit is performed along a nonlinear trajectory, the front part of the seat frame longitudinal beam is lifted upward to a greater extent than the rear part, thereby further lifting the leg extension device in a simple manner, which is more helpful in providing the user with a "zero gravity" experience.

[0016] In one embodiment, the seat frame slides forward relative to the base unit so that the highest point of the backrest bracket tends to move downward and forward.

[0017] In one embodiment, the crank member further includes a fifth pivot point between the third pivot point and the fourth pivot point, the crank member being pivotally connected to the rear portion of the seat frame at the fifth pivot point, wherein the fifth pivot point is located behind the second pivot point.

[0018] In one embodiment, the electric drive unit comprises an electric actuator acting between the base unit and the leg extension device, by means of which the seat unit can be sequentially changed between a sitting position, a TV position and a lying position.

[0019] In this embodiment, preferably, the mechanical extension device includes a motor beam extending transversely between the leg extension devices, wherein the motor head is connected to the base unit, and the motor connecting rod is connected to the motor beam, and the leg extension device and the seat frame are moved sequentially by the extension of the electric actuator. The adjustment stroke achieved by the extension of the electric actuator is divided into two stages that are implemented sequentially, in the first stage, the leg extension device is extended forward relative to the seat frame, and in the second stage, the seat frame slides forward relative to the base unit, and the backrest bracket tilts backward, and the angle between the line between the first pivot point and the second pivot point and the longitudinal beam of the seat frame is reduced.

[0020] In one embodiment, the mechanical extension device comprises an electric drive unit, which comprises a seat frame actuator acting between the base unit and the seat frame and / or a leg actuator acting between the seat frame and the leg extension device, and the mechanical extension device can be transformed between a sitting position, a TV position and / or a lying position by means of the electric drive unit. Preferably, the seat frame actuator and the leg actuator can be controlled independently of each other. The seat frame can slide relative to the base unit by adjusting the seat frame actuator. The leg extension device can be extended and retracted relative to the seat frame by adjusting the leg actuator.

[0021] In order to solve the technical problem, the utility model also provides a movable seat unit, which includes the above-mentioned mechanical extension device.

[0022] The advantages described above with respect to the mechanical extension device also apply to a movable seat unit having such a mechanical extension device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] Figure 1 A perspective view schematically showing a mechanical extension device of a seat unit according to the present invention;

[0025] Figure 2 Schematically shown Figure 1 A partial perspective view from another angle of the mechanical extension device shown in a sitting position;

[0026] Figure 3 Schematically shown Figure 2 TV position of the mechanical extension device shown;

[0027] Figure 4 Schematically shown in a stereogram Figure 2 The lying position of the mechanical extension device shown;

[0028] Figure 5 Shown in side view Figure 1 The seated position of the mechanical extension device shown;

[0029] Figure 6 Schematically shown in side view Figure 2 the TV position of the mechanical extension device as shown; and

[0030] Figure 7 Schematically shown in side view Figure 2 The mechanical extension device is shown in the lying position. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The term "one embodiment" or "embodiment" as referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the utility model. In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. 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 the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here.

[0033] Unless otherwise specified, the "front-rear direction" 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. "Left-right direction" or "lateral direction" refers to the direction of the furniture unit, especially the seat unit, which is perpendicular to the "front-rear direction" in the horizontal direction.

[0034] Figure 1 A perspective view schematically showing a mechanical extension device of a movable seat unit according to the present invention; Figures 2 to 4 The mechanical extension device 1 of the movable seat unit according to the present invention is shown in a partial stereoscopic view. Figures 5 to 7 A mechanical extension device of a seat unit according to the present invention is shown in a side view.

[0035] The mechanical extension device 1 includes a multi-link mechanism and is configured to enable the movable seat to be transformed between a sitting position, a TV position, and a lying position. However, the present invention is not limited thereto. In other embodiments not shown, the movable seat may also be transformed only between the folded position and the TV position or only between the folded position and the lying position.

[0036] The mechanical stretching device includes a base unit 10 fixed relative to the ground, a seat frame 12 slidable relative to the base unit 10 , a backrest unit 2 pivotally connected to the rear of the seat frame 12 , and a leg stretching device 3 pivotally connected to the front of the seat frame 12 .

[0037] In one embodiment, the mechanical extension device is constructed as a movable seat unit with an iron frame and a floor-standing type. Figures 1 to 7 As shown, it includes two base longitudinal beams 101 extending along the front-to-back direction of the seat unit, and a base front cross beam 102 and a base rear cross beam 103 extending transversely between the two base longitudinal beams 101, wherein a base frame is composed of the two base longitudinal beams 101, the base front cross beam 102 and the base rear cross beam 103, and four legs 104 extend downward from the base unit 10 to support the mechanical extension device in a "suspended" manner above the ground.

[0038] In an embodiment not shown, the mechanical extension device can also be configured as a seat unit with a floor-standing armrest. To this end, the base unit 10 can be fixedly attached to the inner side of the armrest portion supported on the ground by means of two base longitudinal beams 101, so that the mechanical extension device is supported "suspended" above the ground.

[0039] The seat frame 12 is used to carry the seat portion of the movable seat unit. Figure 2 As shown, the seat frame 12 is composed of two seat frame longitudinal beams 121 along the front-to-back direction of the seat unit, a seat frame front cross beam 122 and a seat frame rear cross beam 123 extending in different directions between the two seat frame longitudinal beams. In addition, the seat frame 12 also includes a seat frame rear extension 124 extending upward and fixedly arranged at the rear of the seat frame 12. The seat frame rear extension 124 can be integrally formed with the main body of the seat frame 12, or can be fixedly connected thereto as a separate component, for example, by welding, riveting, etc.

[0040] In order to allow the seat frame 12 to slide relative to the base unit 10, the base unit 10 further includes a slide member 11, which is particularly arranged on the base longitudinal beam 101 thereof, wherein the slide member 11 includes at least two slide sections extending at different angles relative to the horizontal plane, namely, a first slide section 14a located in the front and a second slide section 14b located in the rear, and the angle between the first slide section 14a and the horizontal plane is greater than the angle between the second slide section 14b and the horizontal plane. In other words, the first slide section 14a is inclined at a greater angle than the second slide section 14b. In the example Figures 1 to 7 In the illustrated embodiment, the first slotted guide section 14 a and the second slotted guide section 14 b are jointly configured as a continuous slotted guide; however, in an embodiment not shown, the first slotted guide section 14 a and the second slotted guide section 14 b may also respectively configure two independent slotted guides.

[0041] In this embodiment, the second slotted link section 14b preferably extends substantially parallel to the horizontal plane, and the rear end of the first slotted link section 14a and the front end of the second slotted link section 14b transition to each other at an angle, wherein the first slotted link section 14a is significantly inclined upward relative to the horizontal plane.

[0042] The seat frame longitudinal beam 121 of the seat frame 12 is configured to have a substantially L-shaped cross section, including an upwardly facing seat frame top surface 121a and a seat frame side surface 121b extending substantially perpendicularly to the seat frame top surface 121a, wherein the seat frame top surface 121a is configured to support the seat portion, and at least a first roller 14a and a second roller 14b are rotatably mounted on the seat frame side surface 121b. The first roller and the second roller are respectively movably embedded in the slide groove of the slide groove member 11, thereby allowing the seat frame 12 to slide relative to the base unit 10.

[0043] The backrest unit 2 includes a backrest bracket 21 , a backrest link 22 , a bell crank 23 and a follower link 24 , wherein the backrest unit 2 is pivotally connected between the seat frame 12 and the base unit 10 .

[0044] The upper portion of the backrest bracket 21 is fixedly connected to the backrest frame 20, to which the backrest of the seat unit (not shown) is fixedly attached. A backrest link 22 is connected between the front end of the backrest bracket 21 and the seat frame 12, and a crank member 23 is connected between the rear end thereof and the seat frame 12.

[0045] The backrest link 22 is substantially straightly constructed, with its upper end pivotally connected to the front end of the backrest bracket 21 at a first pivot point P1 , and its lower end pivotally connected to the rear end of the seat frame 12 at a second pivot point P2 .

[0046] The crank member 23 includes three pivot points, namely, a third pivot point P3, a fourth pivot point P4 and a fifth pivot point P5. Figure 3As shown, a third pivot point P3 is provided at the upper end of the crank member 23, a fourth pivot point P4 is provided at the lower end thereof, and a fifth pivot point P5 is provided at the middle thereof. The crank member 23 is pivotally connected to the rear end of the backrest bracket 21 at the third pivot point P3 by means of its upper end, and the crank member 23 is pivotally connected to the upper end of the follower link 24 at the fourth pivot point P4 at its lower end, and the follower link 24 is pivotally connected to the rear of the base unit 10 at its lower end. In addition, the crank member 23 is pivotally connected to the rear extension portion 124 of the seat frame at the fifth pivot point P5 at its middle, thereby being pivotally connected to the rear of the seat frame 12, wherein the fifth pivot point P5 is arranged further back than the second pivot point P2, that is, further away from the leg extension device 3 as viewed in the front-rear direction of the seat unit.

[0047] exist Figure 5 The sitting position shown and Figure 6 In the TV posture position shown in FIG. 1 , the first pivot point P1 of the backrest link 22 is further back in the horizontal direction relative to the second pivot point P2, that is, closer to the backrest; and in FIG. Figure 7 In the lying position shown, the first pivot point P1 of the backrest link 22 is further forward in the horizontal direction relative to the second pivot point P2, that is, closer to the direction of the leg extension device 3. This makes it possible that in the lying position, the angle α formed by the line between the first pivot point P1 and the second pivot point P2 of the backrest link 22 and the seat frame top surface 121 is significantly reduced compared to the sitting position and / or the TV position.

[0048] Especially Figure 3 As shown, the leg extension device 3 includes a first link 31, a second link 32, a third link 33 and a fourth link 34, a connecting end surface 35 and an end surface 36 for attaching a footrest not specifically shown in the figure. The first link 31 is rotatably connected to the second link 32, and the third link 33 is rotatably connected to the fourth link 34. The first link 31 and the third link 33 are both rotatably mounted on the seat frame 12, wherein the pivot point between the first link 31 and the seat frame 12 is located behind the pivot point between the third link 33 and the seat frame 12. The footrest is rotatably connected to the second link 32 and the fourth link 34 by means of the connecting end surface 35 and the end surface 36. When the leg extension device 3 is unfolded, that is, as shown in FIG. Figure 6 The TV posture position shown and Figure 7 In the lying position shown, the third connecting rod 33 projects further forward than the first connecting rod 31 .

[0049] In order to enable the seat unit to be transformed between different positions, the mechanical extension device also comprises an electric drive unit 4 .

[0050] In such Figures 1 to 7In the illustrated embodiment, the electric drive unit 4 includes only one electric actuator acting between the base unit 10 and the leg extension device 3. The electric actuator is configured as a linear actuator, which includes a motor head 41, a motor rail 42 fixedly connected to the motor head 41, a motor slider 43 that can slide along the motor rail 42 relative to the motor head 41, and a motor connecting rod 44. The motor head 41 is fixedly mounted on the rear part of the base frame 10, for example, it can be mounted on the base rear cross beam 103 of the base frame 10, or it can be mounted on the back plate of the seat unit fixed relative to the base frame 10; the motor slide rail 42 is fixedly connected to the base front cross beam 102 and the base rear cross beam 103 respectively, so as to be fixedly mounted below the seat frame 12 relative to the base unit 10; one end of the motor connecting rod 44 is hinged to the motor slider 43, and the other end is hinged to the motor cross bar 37, wherein the motor cross bar 37 extends laterally between the leg extension device 3, for example, the motor cross bar 37 is fixedly attached to the third connecting rod 33 of the leg extension device 3 with its two ends, thereby realizing the movement synchronization of the leg extension devices on the left and right sides of the seat unit.

[0051] In the present embodiment, the electric drive unit 4 is designed to utilize a single electric actuator to cause the mechanical extension device of the seat unit to sequentially change between the sitting position, the TV position and the lying position.

[0052] The following is with the help of Figures 2 to 7 The change of the mechanical extension device of the seat unit between the sitting position, the TV position and the lying position is introduced. During the change of the mechanical extension device from the sitting position to the lying position, the adjustment of the electric drive unit 4 is divided into two stages that are implemented in sequence, wherein the change from the sitting position to the TV position is realized in the first stage, and the change from the TV position to the lying position is realized in the second stage.

[0053] When the mechanical extension device is in Figure 2 or Figure 5In the sitting position shown, the backrest frame 20 of the backrest unit 2 stands upright together with the backrest mounting member 21, and the line between the first pivot point P1 and the second pivot point P2 of the backrest link 22 forms an angle α with the seat frame top surface 121 of the seat frame 12. The leg extension device 3 is folded under the seat frame 12. The seat frame 12 is in an initial state without sliding relative to the base unit 10, wherein the first roller 14a and the second roller 14b of the seat frame 12 are respectively located at the rear end of the first slide section 11a and the rear end of the second slide member 11b of the slide member 11. The height of the support foot 104 can be set as needed, for example, it can be 5-15cm, and accordingly, the height H1 of the front end of the seat frame 12 relative to the ground E0 can be selected to be 28-35cm. As a result, the height H2 of the lowest point of the base unit 10, for example, the lowest point of the slide member 11 in this embodiment, relative to the ground E0 is allowed to be 5-15cm. Thus, while the height of the seat frame 12 is significantly reduced, sufficient space is still provided under the seat unit to facilitate the passage of the sweeping robot.

[0054] In a particularly preferred embodiment, the height of the support foot 104 can be set to about 14 cm, so that in the sitting position, the height H1 of the front end of the seat frame relative to the ground E0 is 30-35 cm, and the height H2 of the lowest point of the base unit 10, for example, the lowest point of the slide member 11 in this embodiment relative to the ground E0 is 10-15 cm.

[0055] In another particularly preferred embodiment, the height of the support foot 104 can be set to about 6 cm, so that in the sitting position, the height H1 of the front end of the seat frame relative to the ground E0 is 25-29 cm, and the height H2 of the lowest point of the base unit 10, for example, the lowest point of the slide member 11 in this embodiment relative to the ground E0 is 5-9 cm.

[0056] If the seat unit is to be Figure 2 or Figure 5 The sitting position shown changes to Figure 3 or Figure 6 In the TV posture position shown, the mechanical extension device begins to extend under the action of the electric drive unit 4, wherein the electric drive unit 4 operates so that the motor slider 43 slides along the motor slide rail 42 away from the motor head 41, and pushes the motor cross bar 37 forward through the motor connecting rod 44, thereby unfolding the leg extension device 3. In this process, due to the weight of the user sitting on the seat, the seat frame 12 has not yet slid relative to the base unit 10, so the relative position between the backrest unit 2 and the seat frame 12 remains unchanged, wherein the angle α in the TV posture position remains unchanged from that in the sitting position. In this way, Figure 3 or Figure 6The TV posture position is shown. That is to say, in the above-mentioned first stage, only the leg extension device 3 is unfolded, while the relative position between the backrest unit 2 and the seat frame 12 remains unchanged, and the seat frame 12 does not move forward relative to the base unit 10, that is, the seat frame 12 still maintains its initial state. Correspondingly, as in the sitting position, the backrest angle β formed by the backrest bracket 21 and the ground E0 remains unchanged; the backrest angle β can, for example, be set to the angle between the line between the upper and lower fixed points of the backrest bracket 21 fixedly connected to the backrest frame 20 and the ground E0. In addition, as in the sitting position, the seat frame angle γ formed by the seat frame 12 and the ground E0 also remains unchanged; the seat frame angle γ can, for example, be Figure 6 As shown, it is set as the angle between the top surface of the seat frame 12 and the horizontal line E1 parallel to the ground E0.

[0057] In the mechanical extension device from Figure 3 or Figure 6 The TV posture position shown is transformed to Figure 4 or Figure 7 During the process of the lying position shown, the electric drive unit 4 continues to operate, so that the motor slider 43 slides further away from the motor head 41 along the motor slide rail 42, so that the distance between the motor head 41 and the motor slider 43 is further increased. When the leg extension device 3 is extended forward to the maximum extent, the continued forward movement of the motor slider 43 causes the seat frame 12 to move forward relative to the base unit 10 to change to the slide-out state of the seat frame 12. In this process, the first roller 14a moves forward along the first slide groove section 11a to the front end of the first slide groove section 11a, and the second roller 14b also moves forward along the second slide groove section 11b to the front end of the second slide groove section 11b. Since the first slide groove section 11a is tilted upward to a greater extent than the second slide groove section 11b compared to the horizontal plane, when the seat frame 12 slides forward, the front end of the seat frame 12 is lifted upward at a greater angle than the rear end, and its rear end at least does not fall, thereby effectively avoiding interference with the electric drive power supply 4. That is to say, in the process of changing from the TV posture position to the lying position, the seat frame 12 slides forward and lifts upward at the same time, wherein, in the lying position, the seat frame angle γ formed by the seat frame 12 and the ground E0 can be 13-26°.

[0058] In addition, when the seat frame 12 slides forward relative to the base unit 10, the crank member 23 Figure 4 or Figure 7As shown, the fourth pivot point P4 in the middle of the backrest link 22 rotates counterclockwise, and the height difference between the upper end of the crank member 23 and the third pivot point P3 of the backrest bracket 21 relative to the fourth pivot point P4 in the middle becomes smaller, thereby pushing the backrest bracket 21 forward as a whole, and the upper part of the backrest bracket 21 tilts backward, and the angle α between the first pivot point P1 and the second pivot point P2 of the backrest link 22 and the seat frame top surface 121 of the seat frame 12 is reduced. In this way, the Figure 4 or Figure 7 The lying position shown. In this process, on the one hand, the seat frame 12 itself moves forward, and on the other hand, the backrest bracket 21 also moves forward relative to the seat frame 12 by means of the linkage of the backrest connecting rod 22 and the crank member 23. Therefore, the backrest bracket 21 as a whole has a forward movement trajectory, wherein the rearmost end point of the backrest bracket 21 and the top end of the backrest bracket 21 both move forward significantly, thereby achieving "zero leaning against the wall". In summary, in the second stage, the seat frame 12 moves forward relative to the base unit 10, thereby driving the backrest unit 2 to move forward, and the backrest bracket 21 tilts backward, and the leg extension device 3 extends further forward and upward with the seat frame 12, thereby achieving a "zero gravity" posture. In the process of changing from the TV posture position to the lying position, the backrest angle β formed by the backrest bracket 21 and the ground E0 can be reduced by 30-45°.

[0059] The corresponding reverse position change of the mechanical extension device of the seat unit is achieved by the contraction of the electric drive unit 4, and the adjustment stroke achieved thereby is also divided into two stages implemented successively, in the first stage, the seat frame 12 slides backward relative to the base unit 10, and in the second stage, the leg extension device 3 contracts backward relative to the seat frame 12. No further details will be given here.

[0060] To further ensure the sequential change of the seat unit between various postures, a sequential element 5 is further provided. In this embodiment, the sequential element is constructed as a sequential spring acting between the base unit 10 and the seat frame 12, one end of which is connected to the inner side of the seat frame lateral surface 121b of the seat frame longitudinal beam 121, and the other end is connected to the base unit 10. The sequential spring more reliably ensures the sequential change of the seat unit between the sitting position, the TV position and the lying position, and prevents the disorder of the posture change order.

[0061] In a feasible embodiment not shown, the electric drive unit 4 may include not only one electric actuator, but at least two electric actuators, such as a seat frame actuator acting between the base unit 1 and the seat frame 12 and a leg actuator acting between the seat frame 12 and the leg extension device 3. To this end, for example, the motor head of the seat frame actuator may act on the base rear beam 103 of the base unit 10, its motor slide rail is fixedly connected between the base front beam 102 and the base rear beam 103, and its motor connecting rod acts on the seat frame rear beam 123 or the seat frame front beam 122; the motor head of the leg actuator may act on the seat frame rear beam 123 or the seat frame front beam 122, and its motor connecting rod acts on the motor beam 37. With the electric drive unit 4, the seat unit can be changed between the sitting position, the TV position and the lying position. The seat frame actuator and the leg actuator can operate independently of each other, so that the forward and backward sliding of the seat frame 12 and the extension and retraction of the leg extension device 3 can be implemented independently of each other.

[0062] The above description has fully disclosed the specific implementation of the utility model. It should be pointed out that any changes made by technicians familiar with the field to the specific implementation of the utility model do not deviate from the scope of the claims of the utility model. Accordingly, the scope of the claims of the utility model is not limited to the above specific implementation.

Claims

1. A mechanical extension device for a movable seat unit, characterized in that The mechanical stretching device comprises: A base unit fixedly arranged relative to the ground, by means of which the mechanical extension device is movably supported above the ground, wherein the base unit comprises a guide member with a first guide section and a second guide section; A seat frame, comprising at least one roller, wherein the sliding movement of the seat frame relative to the base unit is achieved by the mutual cooperation of the slide member and the roller; a leg extension pivotally connected to the front portion of the seat frame; and The electric drive unit at least comprises a motor head fixedly connected to the base unit, a motor slide rail fixedly arranged on the base unit below the seat frame, a motor slider that can slide along the motor slide rail, and a motor connecting rod connected between the motor slider and the leg extension device or the seat frame, and the electric drive unit can drive the seat unit to change between a sitting position and a lying position. The first slide groove section is inclined upward to a greater extent relative to the horizontal plane than the second slide groove section, so that the seat frame slides forward relative to the base unit in the lying position compared to the sitting position, and the front end of the seat frame is lifted upward to a greater extent than the rear end.

2. The mechanical stretching device according to claim 1, characterized in that: In the sitting position, the front end of the seat frame is at a height of 25-35 cm relative to the ground.

3. The mechanical stretching device according to claim 2, characterized in that: The lowest point of the base unit is 5-15 cm high relative to the ground.

4. The mechanical stretching device according to claim 1, characterized in that: The second slotted guide section extends parallel to a horizontal plane.

5. The mechanical stretching device according to claim 1, characterized in that: The first slotted guide section extends in a straight line.

6. The mechanical stretching device according to claim 1, characterized in that: The first slotted guide section extends in a curved manner.

7. The mechanical stretching device according to claim 1, characterized in that: The first slotted link section and the second slotted link section are configured as a continuous slotted link.

8. The mechanical stretching device according to claim 7, characterized in that The seat frame includes a pair of seat frame longitudinal beams extending along the front-to-back direction of the seat unit, and the seat frame longitudinal beams include at least a first roller and a second roller, wherein during the sliding movement of the seat frame relative to the base unit, the first roller rolls at least in a first slide groove section, and the second roller rolls at least in a second slide groove section.

9. The mechanical stretching device according to claim 1, characterized in that: The first sliding guide section and the second sliding guide section are respectively configured as sliding guides independent of each other.

10. The mechanical stretching device according to claim 9, characterized in that The seat frame includes a pair of seat frame longitudinal beams extending along the front-to-rear direction of the seat unit, and the seat frame longitudinal beams include at least a first roller and a second roller, the first roller is rollably embedded in the first slide groove section, and the second roller is rollably embedded in the second slide groove section.

11. The mechanical stretching device according to claim 1, characterized in that The mechanical extension device includes a backrest unit, which is pivotally connected between the base unit and the seat frame, and includes a backrest bracket, a backrest connecting rod and a crank member, wherein the backrest bracket is used to attach the backrest of the seat unit, and the backrest connecting rod includes a first pivot point located at its upper end and a second pivot point located at its lower end, wherein the backrest connecting rod is pivotally connected to the front end of the backrest bracket at the first pivot point, and is pivotally connected to the seat frame at the second pivot point, and the upper end of the crank member is pivotally connected to the rear end of the backrest bracket at a third pivot point, and the lower end of the crank member is pivotally connected to the base unit at a fourth pivot point.

12. The mechanical stretching device according to claim 1, characterized in that Once the seat frame slides forward relative to the base unit, the angle formed by the line connecting the first pivot point and the second pivot point and the seat frame is reduced.

13. The mechanical stretching device according to claim 1, characterized in that The seat frame slides forward relative to the base unit, so that the highest point of the backrest bracket has a tendency to move downward and forward.

14. The mechanical stretching device according to claim 1, characterized in that The crank member also includes a fifth pivot point located between the third pivot point and the fourth pivot point, and the crank member is pivotally connected to the rear portion of the seat frame at the fifth pivot point, wherein the fifth pivot point is located rearward of the second pivot point.

15. The mechanical stretching device according to claim 11, characterized in that The electric drive unit comprises an electric actuator acting between the base unit and the leg extension device, by means of which the seat unit can be sequentially changed between a sitting position, a TV position and a lying position.

16. The mechanical stretching device according to claim 15, characterized in that The mechanical extension device includes a motor beam extending laterally between the leg extension devices, wherein the motor head is connected to the base unit and the motor connecting rod is connected to the motor beam, and the leg extension device and the seat frame are moved sequentially by extension of the electric actuator.

17. The mechanical stretching device according to claim 15, characterized in that The adjustment stroke achieved by the extension of the electric actuator is divided into two stages implemented successively. In the first stage, the leg extension device is extended forward relative to the seat frame. In the second stage, the seat frame slides forward relative to the base unit and the backrest bracket tilts backward, and the angle formed by the line between the first pivot point and the second pivot point and the seat frame longitudinal beam is reduced.

18. The mechanical stretching device according to claim 11, characterized in that The mechanical extension device comprises an electric drive unit, which includes a seat frame actuator acting between the base unit and the seat frame and / or a leg actuator acting between the seat frame and the leg extension device. With the help of the electric drive unit, the mechanical extension device can be transformed between a sitting position, a TV position and / or a lying position.

19. The mechanical stretching device according to claim 17, characterized in that The seat frame actuator and the leg actuator can be controlled independently of each other.

20. The mechanical stretching device according to claim 19, characterized in that The sliding movement of the seat frame relative to the base unit is achieved by adjusting the seat frame actuator.

21. The mechanical stretching device according to claim 19, characterized in that The leg extension device can be extended and retracted relative to the seat frame by adjusting the leg actuator.

22. A movable seat unit, characterized in that: It comprises a mechanical stretching device as claimed in any one of claims 1 to 21 above.

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