Anti-tank mechanism for a movable seat unit and Anti-tank seat unit

Abstract

The utility model relates to an anti-forward-leaning mechanism for a movable seat unit and an anti-forward-leaning seat unit, the seat unit comprises a leg stretching device capable of moving along the front-back direction of the seat unit and an electric driving unit for driving the leg stretching device to move, and is characterized in that the leg stretching device is provided with an electric driving unit for driving the leg stretching device to move; the forward leaning prevention mechanism comprises an extension sliding rod extending in the front-back direction of the seat unit; the auxiliary connecting rod is fixedly connected to the front end of the extension sliding rod and extends downwards; supporting wheels supported on the ground are arranged at the free ends of the auxiliary connecting rods; the extending sliding rod is fixedly arranged on the leg stretching device, the sliding support is fixedly arranged relative to the ground, the extending sliding rod is supported on the sliding support in a sliding mode, and when the leg stretching device moves relative to the ground in the front-back direction of the seat unit, the forward leaning preventing mechanism synchronously moves in the front-back direction of the seat unit. Therefore, the forward inclination preventing mechanism is switched between the initial position and the extending position.

Description

Technical Field

[0001] The utility model relates to an anti-forward tilting mechanism for a movable seat unit and an anti-forward tilting seat unit. Background Art

[0002] Various movable seating systems are known in the prior art, such as sofas or chairs with multi-position conversion capabilities. As people's living standards improve, the demand for comfort in sofas and chairs is also increasing. In known designs, movable seating units typically include a mechanical extension mechanism that allows them to be converted between a sitting position, a lounge position (or TV position), and a reclining position. When the seating unit is converted from the sitting position to the TV position, the footrest of the seating unit extends forward, slightly changing the angle between the backrest and the seat. When the seating unit is converted from the TV position to the reclining position, the footrest is raised further forward and upward than in the TV position, causing the backrest to recline significantly. In existing movable chair designs, the footrest is often raised as far as possible in the pursuit of a "zero gravity" position in the reclining position, resulting in it being significantly higher than the highest point of the backrest support. This constant pursuit of a user experience in which the leg extension mechanism is raised and extended forward as far as possible causes the center of gravity of the seating unit to shift forward, thereby creating the risk of the entire seating unit tipping forward. Especially in movable seats with floor-standing armrests, in order to leave space under the seat for the cleaning robot to pass through, a smaller base with a higher center of gravity is often used, which further increases the risk of the seat tilting forward. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide an anti-tilt mechanism for a movable seat unit, wherein the seat unit includes a leg stretching device movable in the front-to-back direction of the seat unit and an electric drive unit for driving the leg stretching device to move. The anti-tilt mechanism includes:

[0004] an extended slide bar extending in a fore-aft direction of the seat unit;

[0005] an auxiliary connecting rod fixedly connected to the front end of the extended sliding rod and extending downward;

[0006] a support wheel disposed on the free end of the auxiliary link and supported on the ground; and

[0007] A sliding bracket fixed relative to the ground,

[0008] In which, the extended sliding rod is slidably supported on the sliding bracket. When the leg extension device moves along the front and rear direction of the seat unit relative to the ground, the anti-tilt mechanism moves synchronously along the front and rear direction of the seat unit, thereby transforming the anti-tilt mechanism between the initial position and the extended position.

[0009] The forward extension of the leg extension device causes the overall length of the seat unit to increase, which is most likely to lead to the risk of forward tilting due to the forward shift of the center of gravity. To this end, the anti-tilt mechanism moves forward as the leg extension device moves forward, thereby expanding an additional support area in front of the seat unit. The seat unit is reliably supported by this support area to prevent the seat from tilting forward. In addition, the anti-tilt mechanism includes an extended sliding rod extending forward and an auxiliary connecting rod extending downward from its front end, thereby allowing the anti-tilt mechanism to be arranged "suspended" above the base unit, so as not to occupy the space below the seat unit. Therefore, even if the seat unit, especially its base unit and seat frame, is compact in height, it can ensure that sufficient space is provided below the seat unit for cleaning equipment, such as a sweeping robot, to perform cleaning work.

[0010] According to a preferred embodiment of the present invention, the sliding bracket includes a bracket body and a roller assembly. The lower end of the bracket body is fixed relative to the ground, and the roller assembly is arranged at the upper end of the bracket body. Preferably, the roller assembly includes at least two rollers spaced apart in height, thereby forming a receiving portion for the extended sliding rod. The extended sliding rod is rollingly supported between the at least two rollers. This ensures low-friction directionality in the sliding bracket.

[0011] According to a preferred embodiment of the present invention, the extended slide bar is connected to the electric drive unit, so that when the leg extension device moves in the fore-aft direction of the seat unit, the support wheels synchronously roll on the ground in the fore-aft direction of the seat unit. The electric drive unit not only drives the leg extension device but also synchronously drives the anti-tilt mechanism. As a result, the horizontal movement direction of the anti-tilt mechanism always coincides with the horizontal movement direction of the leg extension device, thereby reliably ensuring that the center of gravity of the seat unit does not exceed the additional support area defined by the support wheels.

[0012] According to a preferred embodiment of the present invention, the anti-tilt mechanism includes a slider connecting rod fixedly connected between the rear end of the extended slide rod and the electric drive unit. Preferably, the slider connecting rod is plate-shaped.

[0013] According to a preferred embodiment of the present invention, the support wheel moves forward 200 mm to 500 mm in the extended position compared to the initial position, thereby providing as much additional support space as possible, thereby reliably ensuring the anti-tilt effect.

[0014] In addition, the present invention also provides an anti-tilt seat unit, the seat unit comprising:

[0015] A base unit is fixedly arranged relative to the ground, comprising a base front crossbeam and a base rear crossbeam that are spaced apart from each other and extend parallel to each other;

[0016] a seat frame slidably movable relative to the base unit;

[0017] a leg extension pivotally connected to the front portion of the seat frame;

[0018] an electric drive unit capable of driving the leg extension device; and

[0019] The above-mentioned anti-tilt mechanism.

[0020] According to a preferred embodiment of the present invention, the base unit further includes a front support leg extending downward from the front crossbeam of the base and supported on the ground, and a rear support leg extending downward from the rear crossbeam of the base and supported on the ground, wherein, in the extended position of the anti-tilt mechanism, the support wheel is located in front of the front support leg. In the initial position, depending on the position of the front support leg, the support wheel can be located immediately in front of the front support leg or retracted between the front support leg and the rear support leg.

[0021] According to a preferred embodiment of the present invention, the electric drive unit includes at least a motor head connected to the base unit, a motor slide rail and a motor slider that can slide along the motor slide rail, wherein the leg extension device and the extension slide rod are both connected to the motor slider, so that when the leg extension device moves along the front and rear direction of the seat unit, the support wheels synchronously roll on the ground along the front and rear direction of the seat unit.

[0022] According to a preferred embodiment of the present invention, the motor head is connected to the base rear crossbeam of the base unit.

[0023] According to a preferred embodiment of the present invention, the leg extension device is pivotally connected to the motor slider via a motor connecting rod.

[0024] According to a preferred embodiment of the present invention, the slider connecting rod is fixedly connected between the rear end of the extended slider and the motor slider.

[0025] According to a preferred embodiment of the present invention, the sliding bracket is fixedly connected to the front cross beam of the base, and the movement of the extended sliding rod along the front-rear direction of the seat unit is guided by the sliding bracket.

[0026] According to a preferred embodiment of the present invention, the bracket body of the sliding bracket is fixedly connected to the front cross beam of the base.

[0027] According to a preferred embodiment of the present invention, the seat frame slides relative to the base unit via a cooperating slide member and a cooperating sliding member. The cooperating sliding member can be configured as a slider or a roller, as long as the cooperating sliding member can be slidably supported in the slide member to achieve sliding movement between the seat frame and the base unit.

[0028] According to a preferred embodiment of the present invention, the base unit includes a slide member with a first slide section and a second slide section, wherein the first slide section is arranged in front of the second slide section, and the first slide section is inclined upward to a greater extent relative to the horizontal plane than the second slide section; the seat frame includes at least one mating sliding member.

[0029] According to a preferred embodiment of the present invention, the first chute section extends in a straight line. Alternatively, according to a preferred embodiment of the present invention, the first chute section extends in a curved line.

[0030] According to a preferred embodiment of the present invention, the seat unit 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. Preferably, the crank member is connected to the base unit by a follower connecting rod.

[0031] According to a preferred embodiment of the present invention, 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.

[0032] According to a preferred embodiment of the present invention, the seat unit can be sequentially switched between a sitting position, a TV position and a lying position by means of the electric drive unit.

[0033] According to a preferred embodiment of the present invention, the adjustment stroke achieved by the extension of the drive unit is divided into two stages implemented successively, in which, in the first stage, the leg extension device extends 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, wherein, during the first stage and the second stage, the support wheels of the anti-tilt mechanism continue to move forward.

[0034] In the design according to the present invention, the motor rails of the electric drive unit are fixedly arranged below the seat frame relative to the base unit. Simultaneously, the seat frame slides along an upward trajectory relative to the base unit. That is, during the transition from its initial position to the slid-out position, the front portion of the seat frame longitudinal beam rises to a greater extent than the rear portion. This ensures that the rear portion of the seat frame does not descend during its entire forward sliding process. This prevents interference between the electric drive unit and the seat frame during position transitions. This allows the front end of the seat frame to be appropriately lowered, eliminating the need to simply raise the seat frame to create sufficient space under the seat, as is done in the prior art.

[0035] Because 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 excessively in the height direction. Unlike the prior art, the seat frame according to the present invention only produces a relatively gentle height difference during the forward sliding process. This means that the backrest connecting rod does not maintain a substantially identical relative position with the seat frame when moving with the seat frame. Instead, under the force of the rotation of the crank member, the backrest connecting rod moves forward with its upper end and approaches the seat frame longitudinal beam, thereby reducing the angle formed by the line connecting the first pivot point and the second pivot point and the seat frame longitudinal beam. This, on the one hand, drives the backrest bracket as a whole to move forward, achieving a completely "zero-wall" arrangement of the seat unit. On the other hand, it allows the backrest unit to be closer to the seat frame to a greater extent during the forward movement of the seat frame, achieving a "zero back rubbing" design. In addition, since the forward sliding movement of the seat frame relative to the base unit is performed along a non-linear trajectory, the front part of the seat frame longitudinal beam is lifted upward to a greater extent than the rear part, thereby achieving further lifting of the leg extension device in a simple manner, which is more conducive to providing the user with a "zero gravity" experience.

[0036] The advantages described above with respect to the anti-tilt mechanism are also applicable to the seat unit having such an anti-tilt mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] Figure 1 A perspective view schematically illustrates a seat unit according to the present invention in a sitting position;

[0039] Figure 2 Schematically shown Figure 1 TV posture position of the seat unit shown;

[0040] Figure 3 Schematically shown in a three-dimensional diagram Figure 1 The seat unit is shown in the reclining position;

[0041] Figure 4 A perspective view schematically shows another angle of the seat unit according to the present invention, in a sitting position;

[0042] Figure 5 Schematically shown Figure 4 TV posture position of the seat unit shown;

[0043] Figure 6 Schematically shown Figure 4 The seat unit is shown in the reclining position;

[0044] Figure 7 A schematic diagram showing an anti-tilt mechanism according to the present invention;

[0045] Figure 8 A side view showing a sitting position of the seat unit according to the present invention;

[0046] Figure 9 Schematically shown in side view Figure 8 The TV posture position of the seat unit as shown; and

[0047] Figure 10 Schematically shown in side view Figure 8 Seat unit shown in lying position. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] References herein to "one embodiment" or "an embodiment" refer to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. In describing the present invention, it should be understood that terms such as "upper," "lower," "left," "right," "top," and "bottom" are used to indicate orientations or positional relationships based on those shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. Thus, a feature designated "first" or "second" may explicitly or implicitly include one or more of the features. Furthermore, the terms "first," "second," and the like are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that such terms are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0050] Unless otherwise specified, the "front-back direction" in this application refers to the extension direction of the leg units of a furniture unit, especially a seat unit. Specifically, "front" refers to the direction toward the leg units, and "rear" refers to the direction toward the backrest unit. The "left-right direction" or "lateral direction" refers to the horizontal direction of a furniture unit, especially a seat unit, which is perpendicular to the "front-back direction."

[0051] Figures 1 to 3 and Figures 4 to 6 The anti-forward tilt seat unit according to the present invention is shown in three-dimensional views at different angles. Figures 8 to 10 The anti-forward tilt seat unit according to the present invention is shown in a side view.

[0052] The seat unit includes a multi-link mechanism and is configured to allow the movable seat to transition between a sitting position, a TV position, and a reclining position. However, the present invention is not limited thereto. In other embodiments (not shown), the movable seat may transition only between a stowed position and a TV position, or only between a stowed position and a reclining position.

[0053] The seat unit includes a base unit 10 fixed relative to the ground, a seat frame 12 slidably movable relative to the base unit 10 , and a leg extension device 3 pivotally connected to the front portion of the seat frame 12 .

[0054] In a preferred embodiment, the seat unit further comprises a backrest unit 2 pivotally connected to the rear portion of the seat frame 12, such as Figures 1 to 6 and Figures 8 and 9However, in an embodiment not shown, the backrest unit may not be included, such as a "chaise longue", in which case the seat unit may not include a backrest.

[0055] In one embodiment, the seat unit is configured as a movable seat unit with floor-standing armrests. Figures 1 to 6 As shown, the seat unit includes two base longitudinal beams 101 extending in the front-to-back direction of the seat unit, and a base front crossbeam 102 and a base rear crossbeam 103 extending transversely between the two base longitudinal beams 101. The two base longitudinal beams 101, the front crossbeam 102, and the rear crossbeam 103 form a base frame. Four legs extend downward from the base unit 10: two front legs 104 and two rear legs 105. This supports the seat unit in a "suspended" position above the ground. In this embodiment, the four legs extend downward from the connection between the front crossbeam 102 and the base longitudinal beams, and from the connection between the rear crossbeam 103 and the base longitudinal beams, respectively, to provide as much continuous space as possible below the base unit, thereby not hindering the passage of cleaning tools such as sweeping robots.

[0056] The seat frame 12 supports the seat portion of the movable seat unit. It includes two longitudinal seat frame beams 121 extending in the front-to-back direction of the seat unit, and a front crossbeam 122 and a rear crossbeam 123 extending in separate directions between the longitudinal seat frame beams 121. Furthermore, the seat frame 12 includes an upwardly extending rearward seat frame extension 124 fixedly disposed at its rear. This rearward seat frame extension 124 can be integrally formed with the main body of the seat frame 12 or a separate component fixedly attached thereto, for example, by welding, riveting, or other methods.

[0057] To allow the seat frame 12 to slide relative to the base unit 10, the base unit 10 further includes a guide member 11, particularly disposed on its base longitudinal beam 101. The guide member 11 includes at least two guide sections extending at different angles relative to the horizontal plane: a first guide section 14a located in the front and a second guide section 14b located in the rear. The first guide section 14a forms a greater angle with the horizontal plane than the second guide section 14b. In other words, the first guide section 14a is inclined at a greater angle than the second guide section 14b. In a preferred embodiment, the first and second guide sections 14a, 14b together form a continuous guide; however, in alternative embodiments, the first and second guide sections 14a, 14b may each form two separate guides.

[0058] In this embodiment, the second slotted guide section 14b preferably extends substantially parallel to the horizontal plane, and the rear end of the first slotted guide section 14a and the front end of the second slotted guide section 14b transition to each other at an angle, wherein the first slotted guide section 14a is significantly inclined upward relative to the horizontal plane.

[0059] The seat frame longitudinal beam 121 of the seat frame 12 is configured to have a generally L-shaped cross-section. It includes an upward-facing seat frame top surface 121a and a seat frame side surface 121b extending generally perpendicular to the seat frame top surface 121a. The seat frame top surface 121a is configured to support the seat portion, while at least two mating sliding members (not specifically shown) are rotatably mounted on the seat frame side surface 121b. In this embodiment, the mating sliding members are configured as sliders. These sliders are movably engaged with the guide grooves of the guide groove member 11, thereby allowing the seat frame 12 to slide relative to the base unit 10.

[0060] According to a preferred embodiment, 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 .

[0061] The upper portion of the backrest bracket 21 is fixedly connected to a backrest frame (not specifically shown), wherein the backrest of the seat unit is fixedly attached to the backrest frame. 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 of the backrest bracket 21 and the seat frame 12.

[0062] The backrest link 22 is substantially straight, 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.

[0063] The crank member 23 includes three pivot points, namely the third pivot point P3, the fourth pivot point P4 and the fifth pivot point P5. Figure 4 and Figure 5 As 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, and a fifth pivot point P5 is provided at the middle portion. The crank member 23 is pivotally connected to the rear end of the backrest bracket 21 at its upper end at the third pivot point P3. The crank member 23 is pivotally connected to the upper end of a follower link 24 at its lower end at the fourth pivot point P4. The follower link 24 is pivotally connected to the rear portion of the base unit 10 at its lower end. Furthermore, the crank member 23 is pivotally connected to the rear seat frame extension 124 at its middle portion at the fifth pivot point P5, thereby pivotally connecting to the rear portion of the seat frame 12. The fifth pivot point P5 is located further rearward than the second pivot point P2, that is, farther from the leg extension 3 in the fore-aft direction of the seat unit.

[0064] exist Figure 4The sitting position shown and Figure 5 In the TV posture position shown, 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; Figure 6 In the lying position shown, the first pivot point P1 of the backrest link 22 is located 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 connecting 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, as shown in FIG. Figures 8 to 10 As shown schematically in .

[0065] Especially Figure 5 and Figure 6 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 5 TV posture position shown and Figure 6 In the lying position shown, the third link 33 projects further forward than the first link 31 .

[0066] In order to enable the seating unit to be transformed between different positions, the seating unit further comprises an electric drive unit 4 .

[0067] In such Figures 1 to 6In 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 and includes a motor head 41, a motor rail 42 fixedly connected to the motor head 41, a motor slider 43 slidable 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 panel 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.

[0068] In this embodiment, the electric drive unit 4 is designed to utilize a single electric actuator to cause the seat unit to sequentially transform between a sitting position, a TV position, and a lying position.

[0069] When the seat unit is transformed from a sitting position to a TV position or even a lying position, the leg extension device 3 is deployed forward. This causes the center of gravity of the seat unit to shift forward, which creates the risk of the seat unit tipping forward. To this end, the seat unit also includes an anti-tip mechanism 6.

[0070] Figure 7The figure shows the anti-tilt mechanism 6 according to the present invention and its connection with other components of the seat unit. The anti-tilt mechanism 6 includes a pair of extended slide bars 61 extending in parallel with each other in the front-to-back direction of the seat unit and an auxiliary connecting rod 62 fixedly connected to the front end of the extended slide bar 61 and extending downward, wherein the auxiliary connecting rod 62 and the extended slide bar 61 are oriented perpendicular to each other. A support wheel 63 supported on the ground is arranged at the free end of the auxiliary connecting rod 62. The support wheel 63 rolls on the ground, thereby reducing the friction between the anti-tilt mechanism 6 and the ground. The rear end of the extended slide bar 61 is connected to the motor slider 43 by means of a slider connecting rod 65. The slider connecting rod 65 is constructed in a plate shape and is fixedly connected to the motor slider 43 and the extended slide bar 61 respectively by means of welding, riveting, threaded connection, etc., so that when the motor slider 43 moves along the motor slide rail 42, the extended slide bar 61 is driven to move synchronously. At the same time, the motor slider 43 is also connected to the aforementioned motor connecting rod 44, the front end of which is pivotally connected to the motor cross bar 37, which is in turn connected to the leg stretching device 3. Therefore, when the leg stretching device 3 is extended forward or retracted backward, the anti-tilt mechanism 6 slides forward or backward accordingly. In addition, the anti-tilt mechanism 6 also includes a sliding bracket 64, wherein the sliding bracket 64 includes a bracket body 641 and a roller group 642. Figure 7 As shown in the example, the lower end of the bracket body 641 is fixed to the front crossbeam 102 of the base, wherein three rollers are provided at the upper end of the bracket body 641. These three rollers are divided into two rows, namely, two rollers located at the upper end and one roller located at the lower end. The two rows of rollers are spaced apart to allow the extension slide 61 to be rolled and supported in the receiving portion formed thereby. Therefore, the roller group 642 assists in directional guidance of the extension slide 61 during its movement in the front-to-back direction of the seat unit.

[0071] The following reference Figures 1 to 6 as well as Figures 8 to 10 The following describes how the seat unit changes from a sitting position, a TV position, and a reclining position. During the transition from the sitting position to the reclining position, the electric drive unit 4 adjusts in two stages, one for the sitting position and the other for the TV position. The first stage involves the transition from the sitting position to the TV position, and the second stage involves the transition from the TV position to the reclining position.

[0072] When the seat unit is Figure 1 、 Figure 4 or Figure 8In the sitting position shown, the backrest mounting member 21 of the backrest unit 2 stands upright, and the line connecting the first pivot point P1 and the second pivot point P2 of the backrest connecting rod 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. The height of the support leg 104 can be set as needed, for example, it can be 5-15 cm. Accordingly, the height H1 of the front end of the seat frame 12 relative to the ground E0 can be selected to be 28-35 cm. As a result, the lowest point of the base unit 10, for example, the lowest point of the slide member 11 in this embodiment, is allowed to have a height H2 of 5-15 cm relative to the ground E0. As a result, 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.

[0073] At this point, the anti-tilt mechanism 6 is in its entirety in its initial position, with its extended slide bar 61 positioned near the rear of the seat unit. This positions the auxiliary link 62, with its free end support wheel 63, behind the front support leg 104. In this case, the effective support area of ​​the seat unit corresponds to the length B0 between the front support leg 104 and the rear support leg 105. However, in an embodiment not shown, it is also conceivable that, when the anti-tilt mechanism 6 is in its initial position, the auxiliary link 62, with its free end support wheel 63, is positioned immediately in front of the front support leg 104, i.e., slightly in front of it. In this case, the effective support area of ​​the seat unit corresponds to the length between the support wheel 63 and the rear support leg 105, rather than the length between the front support leg 104 and the rear support leg 105.

[0074] If the seat unit is to be Figure 1 、 Figure 4 or Figure 8 The sitting position shown changes to Figure 2 、 Figure 5 or Figure 9 In the TV posture position shown, the seat unit begins to extend under the action of the electric drive unit 4, wherein the electric drive unit 4 operates, causing the motor slider 43 to slide 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 deploying 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, and therefore, 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, in the first stage, only the leg extension device 3 is deployed, while the relative position between the backrest unit 2 and the seat frame 12 remains unchanged. The seat frame 12 does not move forward relative to the base unit 10, that is, the seat frame 12 remains in its initial state. While the motor slider 43 drives the leg extension device 3 to deploy, it also synchronously drives the extension slide 61 of the anti-tilt mechanism 6 forward, thereby causing the support wheel 63 to roll forward. In this case, the support wheel 63 rolls in front of the front support leg 104, and the length of the effective support area of ​​the seat unit is equivalent to the length B1 between the support wheel 63 and the rear support leg 105. Thus, an additional support area is expanded in front of the front support leg 104. Even if the center of gravity of the seat unit moves forward to the additional support area in front of the front support leg 104 due to the extension of the leg extension device 3, the seat unit can be effectively prevented from tilting forward.

[0075] In the seat unit from Figure 2 、 Figure 5 or Figure 9 The TV pose position shown is transformed to Figure 3 、 Figure 6 or Figure 10During the reclining position shown, the electric drive unit 4 continues to operate, causing the motor slider 43 to slide further away from the motor head 41 along the motor rail 42, further increasing the distance between the motor head 41 and the motor slider 43. When the leg extension device 3 is extended forward to its 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, transitioning to the slid-out position. Because the first slide groove section 11a is tilted upward at a greater angle than the second slide groove section 11b relative to the horizontal plane, the front end of the seat frame 12 rises upward at a greater angle than the rear end when the seat frame 12 slides forward, while the rear end at least does not descend, effectively avoiding interference with the electric drive power source 4. Furthermore, as the seat frame 12 slides forward relative to the base unit 10, the crank member 23 rotates about its central fifth pivot point P5, reducing the angle α between the line connecting 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. Thus, a reclining position is achieved. During this process, the seat frame 12 itself moves forward, while the backrest bracket 21 also simultaneously moves forward relative to the seat frame 12 via the coordinated action of the backrest link 22 and the crank member 23. As a result, the backrest bracket 21 as a whole follows a forward trajectory, with both the rearmost end and the top end of the backrest bracket 21 moving significantly forward, thereby achieving a "zero leaning against the wall" position. In summary, during the second stage, the seat frame 12 moves forward relative to the base unit 10, thereby driving the backrest unit 2 forward. The backrest bracket 21 tilts backward, and the leg extension mechanism 3 extends further forward and upward along with the seat frame 12, thereby achieving a "zero gravity" position. During this process, the further forward and upward movement of the leg extension mechanism 3 causes the center of gravity of the seat unit to shift further forward. As the motor slider 43 drives the leg extension mechanism 3 forward, it also synchronously drives the extension slide 61 of the anti-tilt mechanism 6 forward, thereby causing the support wheel 63 to roll further forward. In this case, the length B1 between the support wheel 63 and the rear support foot 105 is further increased compared to the TV posture position. Thus, the additional support area expanded in front of the front support foot 104 is also further increased.

[0076] Of course, for a seat unit that does not include a backrest, the aforementioned changes in the TV posture and reclining posture positions do not involve changes in the backrest, but rather involve varying degrees of forward extension of the leg extension. When the leg extension has moved forward to its maximum extent in the fore-aft direction of the seat unit, the anti-tilt mechanism 6 correspondingly reaches its extended position. In the extended position, the support wheels 63 move forward by 200 mm to 500 mm compared to the initial position of the anti-tilt mechanism 6.

[0077] The corresponding reverse position change of the seat unit is achieved by retracting the electric drive unit 4. The adjustment stroke achieved thereby is also divided into two stages, which are implemented successively. In the first stage, the seat frame 12 slides rearward relative to the base unit 10, and the leg extension device 3 is correspondingly retracted, wherein the anti-tilt mechanism 6 is correspondingly retracted therefrom. In the second stage, the leg extension device 3 is further retracted rearward relative to the seat frame 12, and the anti-tilt mechanism 6 is correspondingly returned to its initial position. Detailed description is omitted here.

[0078] The above description fully discloses the specific embodiments of the present invention. It should be noted that any modifications made by persons skilled in the art to the specific embodiments of the present invention do not depart from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not limited solely to the aforementioned specific embodiments.

Claims

1. An anti-tilt mechanism for a movable seat unit, the seat unit comprising a leg extension device movable in a front-to-rear direction of the seat unit and an electric drive unit for driving the leg extension device to move, characterized in that: The anti-tilt mechanism comprises: an extended slide bar extending in a fore-aft direction of the seat unit; an auxiliary connecting rod fixedly connected to the front end of the extended sliding rod and extending downward; a support wheel disposed on the free end of the auxiliary link and supported on the ground; and A sliding bracket fixed relative to the ground, In which, the extended sliding rod is slidably supported on the sliding bracket. When the leg extension device moves along the front and rear direction of the seat unit relative to the ground, the anti-tilt mechanism moves synchronously along the front and rear direction of the seat unit, thereby transforming the anti-tilt mechanism between the initial position and the extended position.

2. The anti-tilt mechanism according to claim 1, characterized in that: The sliding bracket includes a bracket body and a roller group, wherein the lower end of the bracket body is fixed relative to the ground, and the roller group is arranged on the upper end of the bracket body.

3. The anti-tilt mechanism according to claim 2, characterized in that: The roller set includes at least two rollers that are spaced apart from each other in the height direction, thereby forming a receiving portion for the extended sliding rod, wherein the extended sliding rod is rolling-supported between the at least two rollers.

4. The anti-tilt mechanism according to claim 1, characterized in that: The extended slide bar is connected to the electric drive unit so that when the leg extension device moves in the front-rear direction of the seat unit, the support wheels roll on the ground in the front-rear direction of the seat unit synchronously.

5. The anti-tilt mechanism according to claim 4, characterized in that: The anti-tilt mechanism includes a slider connecting rod fixedly connected between the rear end of the extended slide rod and the electric drive unit.

6. The anti-tilt mechanism according to claim 5, characterized in that: The sliding link is designed to be plate-shaped.

7. The anti-tilt mechanism according to claim 1, characterized in that: In the extended position, the support wheels are moved forward by 200 mm to 500 mm compared to the initial position.

8. A seat unit with an anti-tilt function, characterized in that: The seat unit comprises: A base unit is fixedly arranged relative to the ground, comprising a base front crossbeam and a base rear crossbeam that are spaced apart from each other and extend parallel to each other; a seat frame slidably movable relative to the base unit; a leg extension pivotally connected to the front portion of the seat frame; an electric drive unit capable of driving the leg extension device; and The anti-tilt mechanism according to any one of claims 1 to 7.

9. The seating unit according to claim 8, wherein The base unit further includes a front support leg extending downward from the front cross beam of the base and supported on the ground, and a rear support leg extending downward from the rear cross beam of the base and supported on the ground, wherein in the extended position of the anti-tilt mechanism, the support wheel is located in front of the front support leg.

10. The seating unit of claim 9, wherein: The electric drive unit includes at least a motor head connected to the base unit, a motor slide rail and a motor slider that can slide along the motor slide rail, wherein the leg extension device and the extension slide rod are both connected to the motor slider, so that when the leg extension device moves along the front and rear direction of the seat unit, the support wheels synchronously roll on the ground along the front and rear direction of the seat unit.

11. The seating unit of claim 10, wherein: The motor head is connected to the base rear crossbeam of the base unit.

12. The seating unit of claim 11, wherein: The leg extension device is pivotally connected to the motor slider via a motor connecting rod.

13. The seating unit of claim 11, wherein: The slider connecting rod is fixedly connected between the rear end of the extended slider and the motor slider.

14. The seating unit of claim 8, wherein: The sliding bracket is fixedly connected to the front cross beam of the base, and guides the movement of the extended sliding rod along the front-rear direction of the seat unit through the sliding bracket.

15. The seating unit of claim 14, wherein: The support body of the sliding support is fixedly connected to the front crossbeam of the base.

16. The seating unit of claim 8, wherein: The sliding movement of the seat frame relative to the base unit is achieved by a sliding groove member and a matching sliding member that cooperate with each other.

17. The seating unit of claim 16, wherein: The mating slide is configured as a slide block or a roller.

18. The seating unit of claim 16, wherein: The base unit includes a slide member with a first slide section and a second slide section, wherein the first slide section is arranged in front of the second slide section, and the first slide section is inclined upward to a greater extent relative to the horizontal plane than the second slide section; the seat frame includes at least one mating sliding member.

19. The seating unit of claim 18, wherein: The first slotted link section extends in a straight line.

20. The seating unit of claim 18, wherein: The first slotted link section extends in a curved manner.

21. The seating unit of claim 8, wherein: The seat unit includes a backrest unit, which is pivotally connected between the base unit and the seat frame, and includes a backrest bracket, a backrest link and a crank member, wherein the backrest bracket is used to attach the backrest of the seat unit, and the backrest link includes a first pivot point located at its upper end and a second pivot point located at its lower end, wherein the backrest link 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.

22. The seating unit of claim 21, wherein: The bell crank is connected to the base unit by a follower link.

23. The seating unit of claim 21, wherein: 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.

24. The seating unit of claim 21, wherein: The electric drive unit can be used to sequentially shift the seat unit between a sitting position, a TV position and a lying position.

25. The seating unit of claim 24, wherein: The adjustment stroke achieved by the extension of the drive unit 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. During the first and second stages, the support wheels of the anti-tilt mechanism continue to move forward.

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