Mechanical stretching device and seat unit

Abstract

The invention discloses a mechanical stretching device and a seat unit, the mechanical stretching device comprises a base, a base, a backrest assembly, a leg assembly, a connecting structure, a driving device, a swing assembly and a supporting assembly, the leg assembly and the backrest assembly are both rotatably connected to the base, and the leg assembly and the backrest assembly are arranged on the two opposite sides of the base; the connecting structure is connected to the leg assembly, the driving device is rotationally connected to the connecting structure, the swinging assembly is movably connected to the base, the supporting assembly is movably connected to the swinging assembly, one of the swinging assembly and the supporting assembly is provided with a rail, and the other one is provided with a guide piece; in the process that the mechanical stretching device is converted from the sitting posture position to the TV posture position, the guide piece and the track are relatively static; in the process that the mechanical stretching device is converted from the TV posture position to the lying posture position, the guide piece moves along the track so that the supporting assembly can be supported on the ground.

Description

Technical Field

[0001] This application relates to the field of seating technology, and in particular to a mechanical extension device and a seat unit. Background Technology

[0002] To meet the comfort needs of modern users in various scenarios such as home office, audio-visual entertainment, and relaxation, some multifunctional seats on the market can smoothly switch between a standard sitting posture, a TV posture with legs extended, and a near-reclining posture via electric or mechanical devices. In such seats, when switching from a standard sitting posture to a TV posture or a reclining posture, the moving parts often move forward as a whole.

[0003] While this movement can improve lying comfort and enhance support and stability, the moving parts of the seat themselves are quite heavy, and this forward shift can cause the seat's center of gravity to move forward. If this shift in the center of gravity is not properly controlled, it may cause the seat to lose balance, creating a serious safety hazard of tipping forward. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a mechanical extension device that can prevent the mechanical extension device from tipping over when in a lying position.

[0005] This application also proposes a seat unit having the aforementioned mechanical extension device.

[0006] According to a first aspect embodiment of the present application, the mechanical extension device includes a base, a base, a backrest assembly, a leg assembly, a connecting structure, and a driving device. The leg assembly and the backrest assembly are both rotatably connected to the base, and the leg assembly and the backrest assembly are disposed on opposite sides of the base. The connecting structure is connected to the leg assembly, and the driving device is rotatably connected to the connecting structure. The mechanical extension device has a sitting position, a TV position, and a reclining position. During the process of changing the mechanical extension device from the sitting position to the TV position, the driving device drives the base to move along a first direction through the connecting structure and drives the leg assembly to extend along the first direction. During the process of changing the mechanical extension device from the TV position to the reclining position, the driving device drives the base to move along the first direction through the connecting structure and drives the backrest assembly to rotate relative to the base in a second direction. The mechanical extension device also includes a swing assembly and a support assembly. The swing assembly is movably connected to the base, and the support assembly is movably connected to the swing assembly. One of the swing assembly and the support assembly is provided with a track, and the other is provided with a guide. During the process of the mechanical extension device changing from a sitting position to a TV position, the guide is relatively stationary with respect to the track. During the process of the mechanical extension device changing from a TV position to a lying position, the guide moves along the track so that the support assembly is supported on the ground.

[0007] The mechanical extension device according to the embodiments of this application has at least the following beneficial effects: In the mechanical extension device, the base is used to support the user's buttocks, the backrest assembly is used to support the user's back, and the leg assembly is used to support the user's legs. The driving device can drive the base, backrest assembly, and leg assembly to move, thereby adjusting the mechanical extension device to a sitting position, a TV position, or a lying position to meet the user's needs for different sitting postures; when the mechanical extension device is in the sitting position, the angle between the base and the horizontal plane is small, the angle between the backrest assembly and the horizontal plane is small, and the leg assembly is retracted; when the mechanical extension device is in the TV position, the angle between the base and the horizontal plane remains approximately constant, the angle between the backrest assembly and the horizontal plane remains approximately constant, and the leg assembly is extended; when the mechanical extension device is in the lying position... As the angle between the base and the horizontal plane increases, the angle between the backrest assembly and the horizontal plane also increases, while the leg assembly remains extended. During the transition from a seated position to a TV position, the base moves relative to the base along a first direction, causing the overall center of gravity of the mechanical extension device to shift forward. The guide and track remain relatively stationary, while the support assembly rotates. During the transition from a TV position to a reclining position, the base continues to move relative to the base along the first direction, causing the overall center of gravity of the mechanical extension device to continue shifting forward. The guide moves along the track, ensuring the support assembly can move along a preset path. The support assembly continues to rotate towards the ground until it contacts the ground, ensuring the stability of the mechanical extension device and preventing it from tipping over due to changes in the center of gravity.

[0008] According to some embodiments of this application, when the mechanical extension device is in a seated position, the track and the guide are in clearance fit, and / or when the mechanical extension device is in a TV position, the track and the guide are in clearance fit, and / or when the mechanical extension device is in a reclining position, the track and the guide are in clearance fit.

[0009] According to some embodiments of this application, the track is formed as a guide groove disposed in the swing assembly, the guide member is movably inserted into the guide groove, and the guide groove includes a proximal end and a distal end along a first direction; When the mechanical extension device is in the seated and TV positions, the guide is located at the distal end; when the mechanical extension device is in the reclining position, the guide is located at the proximal end.

[0010] According to some embodiments of this application, the inner wall of the proximal end is provided with a first cushioning pad, and the inner wall of the distal end is provided with a second cushioning pad; when the mechanical extension device is in a sitting position and a TV position, the guide contacts the second cushioning pad; when the mechanical extension device is in a lying position, the guide contacts the first cushioning pad.

[0011] According to some embodiments of this application, the surface of the guide is provided with a third buffer pad, which contacts the inner wall of the guide groove.

[0012] According to some embodiments of this application, the guide is in contact with the inner wall surface of the track.

[0013] According to some embodiments of this application, the guide is fixedly connected to the support assembly, and the guide and the support assembly are detachably connected.

[0014] According to some embodiments of this application, the support component is provided with at least one first fastener, and the guide is fixedly connected to the support component via the first fastener.

[0015] According to some embodiments of this application, the guide is rotatably connected to the support assembly, and the guide is detachably connected to the support assembly.

[0016] According to some embodiments of this application, the support assembly is provided with at least one first fastener, and the guide is rotatably connected to the support assembly via the first fastener so that the guide can rotate about the first fastener as an axis.

[0017] According to some embodiments of this application, the guide has an arc surface, the guide contacts the inner wall of the track through the arc surface, and the connecting force between the guide and the swing assembly or the support assembly is greater than the frictional force generated by the guide moving along the track.

[0018] According to some embodiments of this application, the support assembly includes a first support rod, a second support rod, a third support rod, and a roller. One end of the first support rod is rotatably connected to the leg assembly, the other end of the first support rod is rotatably connected to one end of the second support rod, and the other end of the second support rod is connected to the roller. The third support rod includes a first straight section, a second straight section, and a first bent section. The first straight section and the second straight section are connected at an angle through the first bent section. The guide is disposed on the first bent section. The end of the first straight section is rotatably connected to the second support rod, and the end of the second straight section is rotatably connected to the swing assembly. During the process of the mechanical extension device changing from the TV position to the lying position, the second support rod lowers its height by rotating so that the roller is supported on the ground.

[0019] According to some embodiments of this application, the swing assembly includes a first swing rod, a second swing rod, a third swing rod, a fourth swing rod, a fifth swing rod, a sixth swing rod, and a seventh swing rod. The track is disposed on the first swing rod. One end of the first swing rod is rotatably connected to one end of the second swing rod, and the other end of the second swing rod is rotatably connected to one end of the third swing rod. The other end of the third swing rod is rotatably connected to the base. One end of the fourth swing rod is rotatably connected to the second swing rod, and the other end of the fourth swing rod is rotatably connected to one end of the fifth swing rod. The other end of the fifth swing rod is rotatably connected to the base. One end of the sixth swing rod is rotatably connected to the fifth swing rod, and the other end of the sixth swing rod is rotatably connected to the first swing rod. One end of the seventh swing rod is rotatably connected to the fourth swing rod, and the other end of the seventh swing rod is rotatably connected to the sixth swing rod. During the process of the mechanical extension device changing from a seated position to a TV position, the swing component is relatively stationary with respect to the base; during the process of the mechanical extension device changing from a TV position to a reclining position, the swing component moves relative to the base along a first direction. During the process of the mechanical extension device changing from the TV position to the lying position, the height of the sixth swing rod is greater than the height of the second swing rod. The second swing rod swings relative to the third swing rod in a third direction, and the sixth swing rod swings relative to the fifth swing rod in a fourth direction, so as to drive the second support rod to rotate and reduce its height through the third support rod.

[0020] According to some embodiments of this application, the base is fixedly provided with a first limiting member; when the mechanical extension device is in a seated position or a TV position, the third swing rod contacts the first limiting member to restrict the movement of the swing assembly.

[0021] According to some embodiments of this application, the base is fixedly provided with a second limiting member; when the mechanical extension device is in a seated position or a TV position, the fifth swing rod contacts the second limiting member to restrict the movement of the swing assembly.

[0022] According to some embodiments of this application, the base is fixedly provided with a third limiting member; when the mechanical extension device is in a lying position, the third swing rod contacts the third limiting member to restrict the movement of the swing assembly.

[0023] According to some embodiments of this application, the backrest assembly includes a backrest mounting plate and a backrest transmission assembly. The backrest mounting plate is used to mount the backrest and is rotatably connected to the base, and can adjust the tilt angle by rotation. The backrest transmission assembly includes a first backrest transmission rod, a second backrest transmission rod, and a third backrest transmission rod. One end of the first backrest transmission rod is rotatably connected to the backrest mounting plate, the other end of the first backrest transmission rod is rotatably connected to one end of the second backrest transmission rod, the other end of the second backrest transmission rod is rotatably connected to one end of the third backrest transmission rod, and the other end of the third backrest transmission rod is rotatably connected to the base. The third backrest transmission rod is fixedly provided with a fourth limiting member; when the mechanical extension device is in a sitting position or a TV position, the fourth limiting member contacts the base to support the base.

[0024] According to some embodiments of this application, the base is fixedly provided with a fifth limiting member; when the mechanical extension device is in a seated position, the third backrest transmission rod contacts the fifth limiting member to restrict the rotation of the third backrest transmission rod.

[0025] According to some embodiments of this application, the base is fixedly provided with a sixth limiting member; when the mechanical extension device is in a reclining position, the third backrest transmission rod contacts the sixth limiting member to restrict the rotation of the third backrest transmission rod.

[0026] According to some embodiments of this application, the base is fixedly provided with a seventh limiting member, and the end of the second backrest transmission rod away from the first backrest transmission rod is provided with a first protrusion; When the mechanical extension device is in the seated position and / or TV position, the first protrusion contacts the seventh limiting member to restrict the rotation of the second backrest transmission rod.

[0027] According to some embodiments of this application, the base is fixedly provided with an eighth limiting member, the backrest mounting plate is provided with a recess, the inner wall of the recess includes a first limiting edge and a second limiting edge, and the eighth limiting member is located within the range of the recess; When the mechanical extension device is in a seated position and / or a TV position, the eighth limiting member contacts the first limiting edge to restrict the rotation of the backrest mounting plate; when the mechanical extension device is in a reclining position, the eighth limiting member contacts the second limiting edge to restrict the rotation of the backrest mounting plate.

[0028] According to some embodiments of this application, the leg assembly includes a leg extension assembly and a leg transmission assembly, wherein the leg transmission assembly is used to drive the leg extension assembly to extend or retract. The leg extension assembly includes a first leg link, a second leg link, a third leg link, a fourth leg link, and a leg support mounting assembly. One end of the first leg link is rotatably connected to the base, and the other end of the first leg link is rotatably connected to one end of the second leg link. The other end of the second leg link is rotatably connected to the leg support mounting assembly. One end of the third leg link is rotatably connected to the base, and the other end of the third leg link is rotatably connected to one end of the fourth leg link. The other end of the fourth leg link is rotatably connected to the leg support mounting assembly. The rotatable connection position of the first leg link to the base is higher than the rotatable connection position of the second leg link to the base. The leg transmission assembly is rotatably connected to the first leg link. The fourth leg link is fixedly provided with a ninth limiting member; when the mechanical extension device is in the TV position or lying position, the first leg link contacts the ninth limiting member to restrict the rotation of the first leg link.

[0029] According to some embodiments of this application, the leg transmission assembly includes a first leg transmission rod and a second leg transmission rod. One end of the first leg transmission rod is rotatably connected to a first leg connecting rod, and the other end of the first leg transmission rod is rotatably connected to one end of the second leg transmission rod. The second leg transmission rod is rotatably connected to the base, the swing assembly is rotatably connected to the second leg transmission rod, and the support assembly is rotatably connected to the second leg transmission rod. When the second leg transmission rod rotates, the second leg transmission rod drives the leg extension assembly to extend or retract via the first leg transmission rod.

[0030] According to some embodiments of this application, the swing assembly includes a first swing rod, the first swing rod is rotatably connected to the second leg transmission rod, and a tenth limiting member is fixedly provided at the end of the first swing rod near the leg transmission assembly; When the mechanical extension device is in the TV position and / or lying position, the second leg drive rod contacts the tenth limiting member to restrict the rotation of the second leg drive rod.

[0031] According to some embodiments of this application, when the mechanical extension device is in a sitting position and / or a lying position, the second leg drive rod contacts the tenth limiting member to restrict the rotation of the second leg drive rod; When the mechanical extension device is in a sitting or lying position, the second leg transmission rod contacts the tenth limiting member at different positions.

[0032] According to some embodiments of this application, the base is fixedly provided with an eleventh limiting member, and the second leg transmission rod is provided with a second protrusion; When the mechanical extension device is in a seated position, the second protrusion contacts the eleventh limiting member to restrict the rotation of the second leg drive rod.

[0033] According to some embodiments of this application, the driving device includes a driver and a drive rod inserted into the driver, the leg assembly includes a second leg transmission rod, the swing assembly includes a third swing rod, the driver is connected to the third swing rod, and the drive rod is connected to the second leg transmission rod.

[0034] According to some embodiments of this application, the third swing rod is fixedly connected to a support structure, the support structure is fixedly connected to a first ear plate extending toward the driver, and the driver is rotatably connected to the first ear plate; The second leg drive rod is fixedly connected to an extension plate, the extension plate extends along a first direction, the connecting structure is fixedly connected to the extension plate, the connecting structure is fixedly connected to a second ear plate extending toward the drive rod, and the drive rod is rotatably connected to the second ear plate.

[0035] According to a second aspect embodiment of the present application, the seat unit includes a seat cushion, a backrest, a leg rest, and the aforementioned mechanical extension device. The seat cushion is connected to the base, the backrest is connected to the backrest assembly, and the leg rest is connected to the leg assembly. When the mechanical extension device is in a reclining position, the angle between the seat cushion and the horizontal plane is 14°-26°, and the height of the leg assembly is greater than the height of the backrest assembly.

[0036] The seat unit according to the embodiments of this application has at least the following beneficial effects: Using the mechanical extension device of the first aspect embodiment of this application, in the mechanical extension device, the base is used to support the user's buttocks, the backrest assembly is used to support the user's back, and the leg assembly is used to support the user's legs. The driving device can drive the base, backrest assembly, and leg assembly to move, thereby adjusting the mechanical extension device to a sitting position, a TV position, or a reclining position to meet the user's needs for different sitting postures; when the mechanical extension device is in the sitting position, the angle between the base and the horizontal plane is small, the angle between the backrest assembly and the horizontal plane is small, and the leg assembly is retracted; when the mechanical extension device is in the TV position, the angle between the base and the horizontal plane remains approximately constant, the angle between the backrest assembly and the horizontal plane remains approximately constant, and the leg assembly is extended; when the mechanical extension device is in the TV position... When the device is in a reclining position, the angle between the base and the horizontal plane increases, the angle between the backrest assembly and the horizontal plane increases, and the leg assembly remains extended. During the transition of the mechanical extension device from a sitting position to a TV position, the base moves relative to the base along a first direction, causing the overall center of gravity of the mechanical extension device to shift forward. The guide and the track remain relatively stationary, and the support assembly rotates. During the transition of the mechanical extension device from a TV position to a reclining position, the base continues to move relative to the base along the first direction, causing the overall center of gravity of the mechanical extension device to continue to shift forward. The guide moves along the track, ensuring that the support assembly can move along a preset path. The support assembly continues to rotate towards the ground until it contacts the ground, ensuring the stability of the mechanical extension device and preventing it from tipping over due to the change in the center of gravity.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] The present application will be further illustrated below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments illustrated in the following drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0039] Figure 1 This is a schematic diagram of the mechanical extension device of this application in a seated position from one perspective; Figure 2 This is a schematic diagram of the mechanical extension device of this application in a seated position from another perspective; Figure 3 This is a schematic diagram of the mechanical extension device of this application in a TV position from one viewpoint; Figure 4 This is a structural schematic diagram from another perspective when the mechanical extension device of the present application is in the TV position; Figure 5This is a schematic diagram of the mechanical extension device of this application in a lying position from one perspective; Figure 6 This is a schematic diagram of the mechanical extension device of this application embodiment in a lying position from another perspective; Figure 7 This is a mechanical extension device according to an embodiment of this application. Figure 4 A magnified view of part A in the middle; Figure 8 This is a schematic diagram of the support component in the mechanical extension device according to an embodiment of this application, taken from one perspective. Figure 9 This is a structural schematic diagram of the support component in the mechanical extension device according to another embodiment of this application; Figure 10 This is a schematic diagram of the swing component in the mechanical extension device of this application embodiment; Figure 11 This is a schematic diagram of the back assembly in the mechanical extension device of this application embodiment; Figure 12 This is a schematic diagram of the leg extension component in the mechanical extension device of this application embodiment; Figure 13 This is a schematic diagram of the leg transmission assembly in the mechanical extension device of this application embodiment; Figure 14 This is a schematic diagram of the installation of the drive device in the mechanical extension device of this application embodiment.

[0040] Figure label: 101. Base; 102. Base; 200. Backrest assembly; 201. Backrest mounting plate; 202. First limiting edge; 203. Second limiting edge; 204. First backrest transmission rod; 205. First protrusion; 206. Second backrest transmission rod; 207. Third backrest transmission rod; 300. Leg assembly; 301. First leg link; 302. Second leg link; 303. Third leg link; 304. Fourth leg link; 305. Leg support mounting assembly; 306. First leg transmission rod; 307. Second leg transmission rod; 308. Second protrusion; 400. Swing assembly; 401. Track; 402. Proximal end; 403. Distal end; 404. First swing rod; 405. Second swing rod; 406. Third swing rod; 407. Fourth swing rod; 408. Fifth swing rod; 409. Sixth swing rod; 410. Seventh swing rod; 411. Synchronizing rod; 500. Support assembly; 501. Guide; 502. First support rod; 503. Second support rod; 504. Third support rod; 505. First straight section; 506. Second straight section; 507. First bending section; 508. Roller; 601. First limiting component; 602. Second limiting component; 603. Third limiting component; 604. Fourth limiting component; 605. Fifth limiting component; 606. Sixth limiting component; 607. Seventh limiting component; 608. Eighth limiting component; 609. Ninth limiting component; 610. Tenth limiting component; 611. Eleventh limiting component; 701. Driving device; 702. Driver; 703. Driving rod; 704. Support structure; 705. First ear plate; 706. Connecting structure; 707. Extension plate; 708. Second ear plate. Detailed Implementation

[0041] The embodiments of this application are described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0042] In the description of this application, it should be understood that the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0044] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In the description of this application, the use of terms such as "one embodiment," "some embodiments," "an example," "some instances," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] This application provides a mechanical extension device, which includes a base 101, a base 102, a backrest assembly 200, a leg assembly 300, a connecting structure 706, and a driving device 701. The base 102 is fixed in position, while the base 101 is movable relative to the base 102, driving the backrest assembly 200, leg assembly 300, and other structures to move during this movement. The base 101 supports the user's buttocks.

[0047] Specifically, the leg assembly 300 is rotatably connected to the base 101, and the leg assembly 300 can extend or retract by rotation. When the leg assembly 300 is extended, it can support the user's legs; when the leg assembly 300 is retracted, it can be hidden at the bottom of the base 101, making it convenient for the user to adopt a normal sitting posture.

[0048] The backrest assembly 200 is rotatably connected to the base 101 and is used to support the user's back. The backrest assembly 200 can be adjusted in angle with the horizontal plane by rotation. When the angle between the backrest assembly 200 and the horizontal plane is relatively small, it is convenient for the user to adopt a normal sitting posture or a posture similar to a normal sitting posture; when the angle between the backrest assembly 200 and the horizontal plane is relatively large, it is convenient to adopt a posture similar to lying flat.

[0049] It is understood that the leg assembly 300 and the backrest assembly 200 are disposed on opposite sides of the base 101, so that the leg assembly 300 corresponds to the user's legs, and the backrest assembly 200 corresponds to the user's back. Meanwhile, the connecting structure 706 is connected to the leg assembly 300, and the driving device 701 is rotatably connected to the connecting structure 706. The driving device 701 of this application can output linear motion, and through the output linear motion, drive the base 101, the backrest assembly 200, the leg assembly 300, and other structures to move in coordination.

[0050] It is worth noting that the mechanical extension device of this application has a sitting position, a TV position, and a lying position. For example... Figure 1 and Figure 2 As shown, when the mechanical extension device is in a seated position, the leg assembly 300 retracts to the bottom of the base 101, and the angle α between the backrest assembly 200 and the horizontal plane is relatively small. Because the backrest assembly 200 supports the user's back, it helps maintain the user's upright posture. Figure 3 and Figure 4 As shown, when the mechanical extension device is in the TV position, the leg assembly 300 extends to support the user's legs and relieve leg fatigue. The angle α between the backrest assembly 200 and the horizontal plane is relatively small. Figure 5 and Figure 6 As shown, when the mechanical extension device is in a lying position, the leg assembly 300 remains extended, and the angle α between the backrest assembly 200 and the horizontal plane is relatively large, allowing the user to adopt a relaxed posture that is close to lying flat.

[0051] During the transition of the mechanical extension device from a seated position to a TV position, the drive device 701 drives the base 101 to move along a first direction, and simultaneously drives the leg assembly 300 to extend along the first direction, which is the [missing information - likely a specific direction or direction]. Figures 1 to 6 The X-axis direction, or the front of the mechanical extension device, is the direction in which the mechanical extension device changes from the TV position to the reclining position. During the process of the mechanical extension device changing from the TV position to the reclining position, the drive device 701 continues to drive the base 101 to move along the first direction, and simultaneously drives the backrest assembly 200 to rotate relative to the base 101 along the second direction, which is the X-axis direction. Figures 1 to 6 The Y direction refers to the backrest assembly reclining 200 degrees. The process of the mechanical extension device changing from a reclining position to a TV position is the reverse of the process of the mechanical extension device changing from a TV position to a reclining position. Similarly, the process of the mechanical extension device changing from a TV position to a sitting position is the reverse of the process of the mechanical extension device changing from a sitting position to a TV position. This will not be elaborated further here.

[0052] Based on the aforementioned principles of motion, it is known that during the process of the mechanical extension device changing from a seated position to a TV position, and then from a TV position to a lying position, the base 101 and other structures always move along the first direction. Since the base 101 and other structures have a certain weight, the overall center of gravity of the mechanical extension device will also shift along the first direction during this process. It is understandable that this change in the center of gravity could easily cause the mechanical extension device to tip forward.

[0053] To prevent the mechanical extension device from tipping over due to changes in its center of gravity, the mechanical extension device of this application further includes a swing assembly 400 and a support assembly 500. The swing assembly 400 is located at the bottom of the base 101 and is movably connected to the base 102. When the mechanical extension device is in a lying position, the support assembly 500 can contact the ground, thereby supporting the entire mechanical extension device and improving its stability on the ground. The support assembly 500 is movably connected to the swing assembly 400. During the process of the mechanical extension device changing from a TV position to a lying position, the swing assembly 400 drives the support assembly 500 to move, causing the support assembly 500 to gradually approach and contact the ground. It is understood that the support assembly 500 in contact with the ground provides an additional support point for the mechanical extension device, thereby preventing it from tipping forward.

[0054] In addition, one of the swing assembly 400 and the support assembly 500 is provided with a track 401, and the other is provided with a guide 501. The guide 501 moves along the track 401 under the constraint of the track 401. Under the constraint of the guide 501 and the track 401, the support assembly 500 can move in a preset direction of movement, ensuring that the support assembly 500 gradually approaches and contacts the ground during the movement.

[0055] Specifically, during the process of the mechanical extension device changing from a seated position to a TV position, the swing component 400 does not move, and the support component 500 rotates closer to the ground but does not touch the ground. During this process, the guide 501 and the track 401 remain relatively stationary. During the process of the mechanical extension device changing from a TV position to a reclining position, the swing component 400 and the support component 500 move in coordination, and the guide 501 moves along the track 401, causing the support component 500 to gradually approach and support the ground.

[0056] The contents of this application are described in detail below with reference to specific embodiments. It should be noted that the following description is merely illustrative and not a specific limitation of this application.

[0057] In some embodiments, in order to ensure that the guide 501 can move smoothly along the track 401, a clearance fit is required between the track 401 and the guide 501. However, when the mechanical extension device is located in certain specific positions, a transition fit or an interference fit may also be used between the track 401 and the guide 501.

[0058] Specifically, when the mechanical extension device is in a seated position, the track 401 and the guide 501 are in clearance fit; and / or, when the mechanical extension device is in a TV position, the track 401 and the guide 501 are in clearance fit; and / or, when the mechanical extension device is in a reclining position, the track 401 and the guide 501 are in clearance fit.

[0059] like Figure 7 As shown, in some embodiments, the track 401 is formed as a guide groove, and the guide groove is disposed on the swing assembly 400. Meanwhile, the guide 501 is disposed on the support assembly 500 and protrudes from the support assembly 500.

[0060] Furthermore, the guide groove defines the movement space of the guide member 501, which is inserted into the guide groove and can move within its range. When the mechanical extension device changes between the TV position and the lying position, the guide groove and the guide member 501 can limit the movement of the support assembly 500. Therefore, the length and extension direction of the guide groove need to be set according to the preset movement mode of the support assembly 500.

[0061] Specifically, in the first direction, the guide groove extends in a manner that gradually increases in height, forming a certain angle.

[0062] Simultaneously, both the proximal end 402 and the distal end 403 of the guide groove are closed in the first direction. When the guide member 501 moves to the proximal end 402 or the distal end 403, the guide member 501 reaches its limit position. Furthermore, the closed proximal end 402 and distal end 403 also prevent the guide member 501 from dislodging from the guide groove, ensuring a continuous and effective connection. When the mechanical extension device is in a seated or TV position, the guide member 501 is always located at the distal end 403; when the mechanical extension device is in a reclining position, the guide member 501 is located at the proximal end 402. Therefore, when the mechanical extension device changes between the TV position and the reclining position, the guide member 501 moves along the guide groove.

[0063] In some embodiments, to prevent the guide 501 from violently colliding with the inner wall of the proximal end 402 or the inner wall of the distal end 403 at the extreme position of movement, the inner wall of the proximal end 402 is provided with a first buffer pad, and the inner wall of the distal end 403 is provided with a second buffer pad.

[0064] Furthermore, the first and second buffer pads can be made of elastic materials such as rubber to cushion collisions. When the mechanical extension device is in a seated or TV position, the guide 501 contacts the second buffer pad, which cushions the impact between the guide 501 and the inner wall of the distal end 403. When the mechanical extension device is in a reclining position, the guide 501 contacts the first buffer pad, which cushions the impact between the guide 501 and the inner wall of the proximal end 402.

[0065] In some embodiments, the surface of the guide 501 is provided with a third cushioning pad. When the mechanical extension device is in a seated position and a TV position, the third cushioning pad on the guide 501 contacts the inner wall of the distal end 403 and provides cushioning between the guide 501 and the inner wall of the distal end 403; when the mechanical extension device is in a reclining position, the third cushioning pad on the guide 501 contacts the inner wall of the proximal end 402 and provides cushioning between the guide 501 and the inner wall of the proximal end 402.

[0066] In addition, since the third buffer pad is disposed on the surface of the guide 501, when the guide 501 is located between the distal end 403 and the proximal end 402, the third buffer pad on the guide 501 will also contact the inner wall of the guide groove.

[0067] In some embodiments, the guide 501 and the inner wall of the track 401 are in surface contact. Surface contact helps to reduce the pressure generated during the contact process, thereby protecting the guide 501 and the inner wall of the track 401 and preventing structural damage to them.

[0068] In some embodiments, the guide 501 is fixedly connected to the support assembly 500. Since the guide 501 cannot move relative to the support assembly 500, when the guide 501 is installed on the track 401, the guide 501 and the track 401 are slidably connected. Therefore, there is sliding friction between the guide 501 and the track 401.

[0069] Furthermore, the guide 501 is detachably connected to the support assembly 500. During installation, the position on the support assembly 500 for installing the guide 501 is first aligned with the track 401, and then the guide 501 is installed. Therefore, the guide 501 does not require excessive installation space to ensure a match with the track 401.

[0070] Meanwhile, the support component 500 is provided with at least one first fastener, and the guide 501 is connected to the support component 500 through the first fastener. Since the guide 501 is fixedly connected to the support component 500 in this embodiment, the first fastener needs to lock the guide 501 to the support component 500.

[0071] In some embodiments, the guide 501 is rotatably connected to the support assembly 500. Since the guide 501 can rotate on the support assembly 500, when the guide 501 is installed on the track 401, the guide 501 and the track 401 are in a rolling connection. Therefore, rolling friction occurs between the guide 501 and the track 401. This embodiment uses rolling friction instead of sliding friction, which significantly reduces the frictional force between the guide 501 and the track 401. Furthermore, in this embodiment, the guide 501 is also detachably connected to the support assembly 500.

[0072] Furthermore, the support assembly 500 is provided with at least one first fastener, and the guide 501 is connected to the support assembly 500 through the first fastener. It is understood that the guide 501 is capable of rotating about the first fastener as an axis. Since the guide 501 is rotatably connected to the support assembly 500 in this embodiment, the first fastener needs to allow sufficient space for the rotation of the guide 501. Therefore, the first fastener in this embodiment cannot lock the guide 501 to the support assembly 500.

[0073] Furthermore, when two first fasteners are provided, the two first fasteners clamp the guide 501 on opposite sides. If the guide 501 needs to be fixedly connected to the support assembly 500, the two first fasteners are tightened on opposite sides of the guide 501, thereby clamping the guide 501 and preventing it from rotating. If the guide 501 needs to be rotatably connected to the support assembly 500, the distance between the two first fasteners is slightly greater than the thickness of the guide 501, thereby reserving space for the guide 501 to rotate.

[0074] In some embodiments, the guide 501 has an arcuate surface, through which the guide 501 contacts the inner wall of the track 401. Specifically, the guide 501 is generally cylindrical, and the size of its arcuate surface matches the inner wall shape of the proximal end 402 and the distal end 403, ensuring that the guide 501 stably contacts the proximal end 402 or the distal end 403.

[0075] Furthermore, during the movement of the guide 501 within the track 401, in order to prevent the guide 501 from detaching from the support assembly 500, the connecting force between the guide 501 and the swing assembly 400 or the support assembly 500 is greater than the frictional force generated by the guide 501 moving along the track 401, ensuring that the guide 501 can overcome the frictional force and move.

[0076] like Figure 8 and Figure 9As shown, in some embodiments, the support assembly 500 includes a first support rod 502, a second support rod 503, a third support rod 504, and a roller 508. One end of the first support rod 502 is rotatably connected to the leg assembly 300, and the other end of the first support rod 502 is rotatably connected to one end of the second support rod 503. The other end of the second support rod 503 is connected to the roller 508. When the mechanical extension device is in a lying position, the roller 508 is used to contact the ground, thereby providing stable support for the mechanical extension device and preventing it from tipping over due to changes in its center of gravity.

[0077] Furthermore, the third support rod 504 includes a first straight section 505, a second straight section 506, and a first bent section 507. The first straight section 505 and the second straight section 506 are connected at an angle through the first bent section 507, so that the third support rod 504 is generally formed in an "L" shape. A guide member 501 is disposed on the first bent section 507. The end of the first straight section 505 is rotatably connected to the second support rod 503, and the end of the second straight section 506 is rotatably connected to the swing assembly 400.

[0078] Specifically, provided that the roller 508 on the second support rod 503 can contact the ground, the specific shapes of the first support rod 502 and the second support rod 503 can be set according to the actual situation. It is worth noting that the second support rod 503 has a bent part in the middle, and the end of the first straight part 505 is rotatably connected to the second support rod 503 at the bent part.

[0079] During the transition of the mechanical extension device from a seated position to a TV position, the second support rod 503 rotates under the drive of the first support rod 502, causing the height of the roller 508 to initially decrease. During the transition of the mechanical extension device from a TV position to a reclining position, the second support rod 503 further decreases in height by rotating, causing the roller 508 to be supported on the ground.

[0080] like Figure 10As shown, in some embodiments, the swing assembly 400 includes a first swing rod 404, a second swing rod 405, a third swing rod 406, a fourth swing rod 407, a fifth swing rod 408, a sixth swing rod 409, and a seventh swing rod 410. A track 401 is disposed on the first swing rod 404. One end of the first swing rod 404 is rotatably connected to one end of the second swing rod 405, and the other end of the second swing rod 405 is rotatably connected to one end of the third swing rod 406. The other end of the third swing rod 406 is rotatably connected to the base 102. The fourth... One end of the swing arm 407 is rotatably connected to the middle of the second swing arm 405. The other end of the fourth swing arm 407 is rotatably connected to one end of the fifth swing arm 408. The other end of the fifth swing arm 408 is rotatably connected to the base 102. One end of the sixth swing arm 409 is rotatably connected to the fifth swing arm 408. The other end of the sixth swing arm 409 is rotatably connected to the first swing arm 404. One end of the seventh swing arm 410 is rotatably connected to the fourth swing arm 407. The other end of the seventh swing arm 410 is rotatably connected to the middle of the sixth swing arm 409. Simultaneously, the end of the second straight section 506 is rotatably connected to the middle of the sixth swing arm 409.

[0081] In terms of shape, the first swing arm 404, the second swing arm 405, the fourth swing arm 407, and the fifth swing arm 408 roughly form a quadrilateral. Furthermore, since the third swing arm 406 and the fifth swing arm 408 are both rotatably connected to the base 102, the swing assembly 400 is movably connected to the base 102 as a whole.

[0082] During the process of the mechanical extension device changing from a seated position to a TV position, the swing component 400 is relatively stationary with respect to the base 102, and the swing component 400 does not function at this time; during the process of the mechanical extension device changing from a TV position to a reclining position, the swing component 400 moves relative to the base 102 along the first direction.

[0083] Specifically, during the movement of the swing assembly 400, the height of the sixth swing rod 409 is greater than the height of the second swing rod 405, and the second swing rod 405 swings in a "V" shape relative to the third swing rod 406 along a third direction, meaning that the second swing rod 405 is positioned on opposite sides of the third swing rod 406 at its two extreme swing positions. Simultaneously, the sixth swing rod 409 also swings in a "V" shape relative to the fifth swing rod 408 along a fourth direction. Since the end of the second straight section 506 is rotatably connected to the middle of the sixth swing rod 409, as the sixth swing rod 409 swings, it can drive the second support rod 503 to lower its height via the third support rod 504, ensuring that the roller 508 is supported on the ground. The third direction is... Figure 10 In the M direction, the fourth direction is... Figure 10 The N direction in the middle.

[0084] In addition, the specific shapes of the first swing rod 404, the second swing rod 405, the third swing rod 406, the fourth swing rod 407, the fifth swing rod 408, the sixth swing rod 409, and the seventh swing rod 410 can be set according to the actual situation.

[0085] It is worth noting that the mechanical extension device is equipped with a backrest assembly 200, a leg assembly 300, a swing assembly 400, and a support assembly 500 on both opposite sides to ensure the stability of the mechanical extension device. To ensure synchronous movement of the backrest assembly 200, leg assembly 300, swing assembly 400, and support assembly 500 on both opposite sides, such as... Figure 14 As shown, the first swing rod 404 and the fifth swing rod 408 are provided with synchronizing rods 411 extending along the width direction of the mechanical extension device. One synchronizing rod 411 connects the first swing rod 404 on opposite sides, and the other synchronizing rod 411 connects the fifth swing rod 408 on opposite sides.

[0086] like Figure 3 As shown, in some embodiments, a first limiting member 601 is fixedly provided on the base 102, and the first limiting member 601 protrudes from the side of the base 102. When the mechanical extension device is in a seated or TV position, the third swing arm 406 contacts the first limiting member 601, thereby restricting the movement of the swing assembly 400; when the mechanical extension device is in a reclining position, the third swing arm 406 disengages from the first limiting member 601.

[0087] like Figure 3 As shown, in some embodiments, a second limiting member 602 is fixedly provided on the base 102, and the second limiting member 602 protrudes from the side of the base 102. When the mechanical extension device is in a seated or TV position, the fifth swing rod 408 contacts the second limiting member 602, thereby restricting the movement of the swing assembly 400; when the mechanical extension device is in a reclining position, the fifth swing rod 408 disengages from the second limiting member 602.

[0088] like Figure 3 As shown, in some embodiments, the base 102 is fixedly provided with a third limiting member 603, and the third limiting member 603 protrudes from the side of the base 102; when the mechanical extension device is in a lying position, the third swing rod 406 contacts the third limiting member 603, thereby restricting the movement of the swing assembly 400; when the mechanical extension device is in a sitting position or a TV position, the third swing rod 406 disengages from the third limiting member 603.

[0089] like Figure 2 and Figure 11As shown, in some embodiments, the backrest assembly 200 includes a backrest mounting plate 201 and a backrest transmission assembly. The backrest mounting plate 201 is used to mount the backrest, and the backrest transmission assembly is used to drive the backrest mounting plate 201 to rotate, thereby adjusting the angle between the backrest mounting plate 201 and the horizontal plane, that is, adjusting the angle between the backrest and the horizontal plane.

[0090] Furthermore, the backrest mounting plate 201 is rotatably connected to the base 101, and the backrest transmission assembly can drive the backrest mounting plate 201 to rotate relative to the base 101.

[0091] Specifically, the backrest transmission assembly includes a first backrest transmission rod 204, a second backrest transmission rod 206, and a third backrest transmission rod 207. One end of the first backrest transmission rod 204 is rotatably connected to the backrest mounting plate 201, and the other end of the first backrest transmission rod 204 is rotatably connected to one end of the second backrest transmission rod 206. The other end of the second backrest transmission rod 206 is rotatably connected to one end of the third backrest transmission rod 207, and the other end of the third backrest transmission rod 207 is rotatably connected to the base 102. Because the third backrest transmission rod 207 is rotatably connected to the base 102, the entire backrest transmission assembly is movably connected to the base 102. The specific shapes of the first backrest transmission rod 204, the second backrest transmission rod 206, and the third backrest transmission rod 207 can be set according to actual conditions.

[0092] Furthermore, a fourth limiting member 604 is fixedly provided on the third backrest transmission rod 207, and the fourth limiting member 604 protrudes from the third backrest transmission rod 207. When the mechanical extension device is in a sitting position or a TV position, the fourth limiting member 604 contacts the base 101, thereby supporting the base 101 and preventing the base 101 from collapsing downwards; when the mechanical extension device is in a reclining position, the fourth limiting member 604 disengages from the base 101.

[0093] like Figure 2 and Figure 11 As shown, in some embodiments, a fifth limiting member 605 is fixedly provided on the base 102, and the fifth limiting member 605 protrudes from the base 102. When the mechanical extension device is in a sitting position, the third backrest transmission rod 207 contacts the fifth limiting member 605, thereby restricting the rotation of the third backrest transmission rod 207; when the mechanical extension device is in a TV position or a reclining position, the third backrest transmission rod 207 disengages from the fifth limiting member 605.

[0094] like Figure 2 and Figure 11As shown, in some embodiments, a sixth limiting member 606 is fixedly provided on the base 102, and the sixth limiting member 606 protrudes from the base 102. When the mechanical extension device is in a reclining position, the third backrest transmission rod 207 contacts the sixth limiting member 606, thereby restricting the rotation of the third backrest transmission rod 207; when the mechanical extension device is in a sitting position or a TV position, the third backrest transmission rod 207 disengages from the sixth limiting member 606.

[0095] like Figure 3 and Figure 11 As shown, a seventh limiting member 607 is fixedly provided on the base 101, and the seventh limiting member 607 protrudes from the base 101. Based on this, a first protrusion 205 is provided at the end of the second backrest transmission rod 206 away from the first backrest transmission rod 204. The first protrusion 205 is used to cooperate with the seventh limiting member 607 for limiting.

[0096] When the mechanical extension device is in a seated or TV position, the first protrusion 205 contacts the seventh limiting member 607 to restrict the rotation of the second backrest transmission rod 206, thereby restricting the rotation of the backrest mounting plate 201; when the mechanical extension device is in a reclining position, the first protrusion 205 disengages from the seventh limiting member 607.

[0097] like Figure 3 and Figure 11 As shown, in some embodiments, the base 101 is fixedly provided with an eighth limiting member 608, and the eighth limiting member 608 protrudes from the base 101. Based on this, the backrest mounting plate 201 is provided with a recessed portion, which is used to cooperate with the eighth limiting member 608 for limiting.

[0098] Specifically, the inner wall of the recess includes a first limiting edge 202 and a second limiting edge 203. When the eighth limiting member 608 cooperates with the first limiting edge 202 and the second limiting edge 203, it can limit the backrest mounting plate 201 to two extreme rotation positions. It can be understood that the eighth limiting member 608 is located within the area of ​​the recess.

[0099] The second limiting edge 203 is closer to the hinge position between the backrest mounting plate 201 and the first backrest transmission rod 204 than the first limiting edge 202. When the mechanical extension device is in a sitting or TV position, the eighth limiting member 608 contacts the first limiting edge 202, thereby restricting the rotation of the backrest mounting plate 201; when the mechanical extension device is in a reclining position, the eighth limiting member 608 contacts the second limiting edge 203, thereby restricting the rotation of the backrest mounting plate 201.

[0100] like Figure 12 As shown, in some embodiments, the leg assembly 300 includes a leg extension assembly and a leg transmission assembly. The leg transmission assembly is used to drive the leg extension assembly to extend or retract.

[0101] Furthermore, the leg extension assembly includes a first leg link 301, a second leg link 302, a third leg link 303, a fourth leg link 304, and a leg support mounting assembly 305. The leg support mounting assembly 305 is used to mount a leg support that supports the user's legs. One end of the first leg link 301 is rotatably connected to the base 101, and the other end of the first leg link 301 is rotatably connected to one end of the second leg link 302. The other end of the second leg link 302 is rotatably connected to the leg support mounting assembly 305.

[0102] One end of the third leg link 303 is rotatably connected to the base 101, and the other end of the third leg link 303 is rotatably connected to one end of the fourth leg link 304. The other end of the fourth leg link 304 is rotatably connected to the leg support mounting assembly 305. The rotatable connection position of the first leg link 301 and the base 101 is higher than the rotatable connection position of the second leg link 302 and the base 101, and the leg transmission assembly is rotatably connected to the first leg link 301. Simultaneously, the middle portion of the first leg link 301 is rotatably connected to the middle portion of the fourth leg link 304.

[0103] Specifically, the shapes of the first leg link 301, the second leg link 302, the third leg link 303, and the fourth leg link 304 can be set according to the actual situation.

[0104] In addition, a ninth limiting member 609 is fixedly provided on the fourth leg link 304, and the ninth limiting member 609 protrudes from the fourth leg link 304. When the mechanical extension device is in the TV position or the lying position, the first leg link 301 contacts the ninth limiting member 609, thereby restricting the rotation of the first leg link 301; when the mechanical extension device is in the sitting position, the first leg link 301 disengages from the ninth limiting member 609.

[0105] like Figure 13 As shown, in some embodiments, the leg transmission assembly includes a first leg transmission rod 306 and a second leg transmission rod 307. One end of the first leg transmission rod 306 is rotatably connected to a first leg connecting rod 301, and the other end of the first leg transmission rod 306 is rotatably connected to one end of the second leg transmission rod 307. The second leg transmission rod 307 is rotatably connected to a base 101, a first swing rod 404 is rotatably connected to the second leg transmission rod 307, and a first support rod 502 is rotatably connected to the second leg transmission rod 307.

[0106] Understandably, when the second leg drive rod 307 rotates, it drives the leg extension assembly to extend or retract via the first leg drive rod 306. Specifically, the shapes of the first leg link 301, the second leg link 302, the third leg link 303, and the fourth leg link 304 can be set according to actual conditions.

[0107] like Figure 5 As shown, in some embodiments, a tenth limiting member 610 is fixedly provided at the end of the first swing arm 404 near the leg transmission assembly, that is, at the end away from the second swing arm 405, and the tenth limiting member 610 protrudes from the first swing arm 404.

[0108] When the mechanical extension device is in the TV position and / or lying position, the second leg drive rod 307 contacts the tenth limit member 610, thereby restricting the rotation of the second leg drive rod 307.

[0109] In some embodiments, the tenth limiting member 610 can not only restrict the rotation of the second leg transmission rod 307 in the TV position and lying position of the mechanical extension device, but also restrict the rotation of the second leg transmission rod 307 in the sitting position of the mechanical extension device.

[0110] Furthermore, one end of the second leg drive rod 307, which is rotatably connected to the second swing rod 405, extends outward, and its outwardly extended portion can contact the tenth limiting member 610. Specifically, when the mechanical extension device is in a seated position, the outwardly extended portion of the second leg drive rod 307 contacts the tenth limiting member 610, thereby restricting the rotation of the second leg drive rod 307; during the process of the mechanical extension device changing from a seated position to a TV position, the outwardly extended portion of the second leg drive rod 307 disengages from the tenth limiting member 610, and as the second leg drive rod 307 rotates, the main body of the second leg drive rod 307 gradually approaches the tenth limiting member 610; when the mechanical extension device is in the TV position, the main body of the second leg drive rod 307 contacts the tenth limiting member 610, thereby restricting the rotation of the second leg drive rod 307. In addition, during the process of the mechanical extension device changing from the TV position to the lying position, the second leg transmission rod 307 is always in contact with the tenth limiting member 610, continuously restricting the rotation of the second leg transmission rod 307.

[0111] like Figure 3 and Figure 13 As shown, in some embodiments, the base 101 is fixedly provided with an eleventh limiting member 611, and the eleventh limiting member 611 protrudes from the base 101. At the same time, on the second leg transmission rod 307, near the rotatable connection position between the second leg transmission rod 307 and the base 101, a second protrusion 308 is provided, and the second protrusion 308 cooperates with the eleventh limiting member 611 to limit the movement.

[0112] When the mechanical extension device is in a seated position, the second protrusion 308 contacts the eleventh limiting member 611, thereby restricting the rotation of the second leg transmission rod 307; when the mechanical extension device is in a TV position or a lying position, the second protrusion 308 disengages from the eleventh limiting member 611.

[0113] In some embodiments, the numerous limiting components involved in the mechanical extension device of this application can be installed in the form of fasteners, which facilitates the disassembly and replacement of the limiting components.

[0114] Furthermore, the numerous rods involved in the mechanical extension device of this application can be configured with staggered portions according to actual needs. When a rod is configured with a staggered portion, the rod portions on both sides of the staggered portion are located on different planes, thereby avoiding other rods or limiting members and preventing structural interference between numerous rods during movement.

[0115] like Figure 14 As shown, in some embodiments, the drive device 701 includes a driver 702 and a drive rod 703, with the drive rod 703 inserted into the driver 702. When the driver 702 is activated, it can drive the drive rod 703 to move, thereby increasing or decreasing the overall length of the drive device 701. Therefore, the drive device 701 can output linear motion.

[0116] Furthermore, the end of the actuator 702 is connected to the third swing arm 406, and the end of the drive arm 703 is connected to the second leg transmission arm 307. When the mechanical extension device changes from a seated position to a TV position, the drive device 701 can drive the leg assembly 300 and the support assembly 500 to move, but the backrest assembly 200 and the swing assembly 400 do not move; when the mechanical extension device changes from a TV position to a reclining position, the drive device 701 can drive the backrest assembly 200, the support assembly 500, and the swing assembly 400 to move, but the leg assembly 300 does not move.

[0117] In some embodiments, two swing assembly 400, two leg assembly 300, two back assembly and two support assembly 500 are provided and located on opposite sides of the mechanical extension device.

[0118] Furthermore, the mechanical extension device includes a support structure 704 and a connecting structure 706, which extend along the width direction of the mechanical extension device, such that the components located on opposite sides of the mechanical extension device are connected as a whole.

[0119] The support structure 704 is fixedly connected to the third swing rods 406 on both sides of the mechanical extension device, and the driver 702 is rotatably connected to the support structure 704. Specifically, a first ear plate 705 extending towards the driver 702 is fixedly connected to the support structure 704. The first ear plate 705 is equipped with a corresponding pivot, which connects the end of the driver 702 to the first ear plate 705. Therefore, the driver 702 is rotatably connected to the support structure 704 through the first ear plate 705.

[0120] Meanwhile, the connecting structure 706 is fixedly connected to the second leg transmission rods 307 on both sides of the mechanical extension device, and the drive rod 703 is rotatably connected to the connecting structure 706. Specifically, the second leg transmission rod 307 is fixedly connected to an extension plate 707, which extends along a first direction. The connecting structure 706 is fixedly connected to the extension plate 707, thus the connecting structure 706 is fixedly connected to the second leg transmission rod 307 via the extension plate 707. In addition, the connecting structure 706 is fixedly connected to a second ear plate 708 extending towards the drive rod 703. The second ear plate 708 is also equipped with a corresponding pivot, which connects the end of the drive rod 703 to the second ear plate 708. Therefore, the drive rod 703 is rotatably connected to the connecting structure 706 via the second ear plate 708.

[0121] In some embodiments, multiple drive devices 701 may be provided, with multiple drive devices 701 arranged side by side between the support structure 704 and the connecting structure 706, and each drive device 701 needs to maintain synchronous movement.

[0122] This application provides a seat unit, which includes a seat cushion, a backrest, a leg rest, and the aforementioned mechanical extension device. The seat cushion is connected to a base 101, the backrest is connected to a backrest assembly 200, and the leg rest is connected to a leg assembly 300.

[0123] When the mechanical extension device is in a reclining position, the angle between the seat cushion and the horizontal plane is 14°-26°, and the height of the leg assembly 300 is greater than the height of the backrest assembly 200.

[0124] In actual implementation, the base 101, backrest assembly 200, leg assembly 300, swing assembly 400, support assembly 500, and drive device 701 together constitute a collaborative support system. The base 101, as the main component supporting the user's buttocks, provides basic support for the body; the backrest assembly 200 conforms to the curve of the user's back, providing stable support; and the leg assembly 300 supports the legs. The drive device 701, as the power source, can control the movement of the base 101, backrest assembly 200, and leg assembly 300 according to user commands, allowing the mechanical extension device to switch between various preset postures, including common sitting, TV, and lying positions, meeting the user's posture needs in different usage scenarios. Specifically, in the sitting position, the angle between the base 101 and the horizontal plane is small, and the angle between the backrest assembly 200 and the horizontal plane is also small, providing relatively upright back support. At this time, the leg assembly 300 is in a retracted state, allowing the user's feet to land naturally. When shifting to the TV position, the tilt angle of the base 101 and the backrest assembly 200 remains basically unchanged, but the leg assembly 300 gradually extends, allowing the user's legs to stretch out, suitable for relaxing scenarios such as watching TV. When shifting to the reclining position, the angle between the base 101 and the horizontal plane increases significantly, and the backrest assembly 200 also tilts backward accordingly, putting the user in a near-flat position, while the leg assembly 300 remains extended, providing full-body support.

[0125] Furthermore, during the transition of the mechanical extension device from a seated position to a TV position, the base 101 moves relative to the base 102 along the first direction, thereby moderately shifting the center of gravity of the entire device forward. During this process, the swing component 400 remains stationary, while the support component 500 and leg component 300 move, causing the leg component 300 to gradually extend and the rollers 508 on the support component 500 to lower to a certain height. Simultaneously, the guide 501 remains relatively stationary within the track 401. As the mechanical extension device continues to transition from the TV position to a reclining position, the base 101 continues to move along the first direction, further pushing the overall center of gravity forward. During this process, the height of the base 101, along with the leg component 300, increases, the backrest component 200 adjusts its angle through a main rotation, and the swing component 400 and support component 500 move in coordination. At the same time, the guide 501 begins to move along the track 401, constrains the support assembly 500 to move along a predetermined path, and gradually rotates towards the ground until the roller 508 contacts the ground, forming an additional support point, which effectively improves the overall stability and safety of the device in the lying position and prevents the mechanical extension device from tipping forward when it is in the lying position.

[0126] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A mechanical extension device, characterized in that, The device includes a base, a base, a backrest assembly, a leg assembly, a connecting structure, and a driving device. The leg assembly and the backrest assembly are rotatably connected to the base. The leg assembly and the backrest assembly are disposed on opposite sides of the base. The connecting structure is connected to the leg assembly, and the driving device is rotatably connected to the connecting structure. The mechanical extension device has a sitting position, a TV position, and a reclining position. During the process of changing the mechanical extension device from the sitting position to the TV position, the driving device drives the base to move along a first direction through the connecting structure and drives the leg assembly to extend along the first direction. During the process of changing the mechanical extension device from the TV position to the reclining position, the driving device drives the base to move along the first direction through the connecting structure and drives the backrest assembly to rotate relative to the base in a second direction. The mechanical extension device also includes a swing assembly and a support assembly. The swing assembly is movably connected to the base, and the support assembly is movably connected to the swing assembly. One of the swing assembly and the support assembly is provided with a track, and the other is provided with a guide. During the process of the mechanical extension device changing from a sitting position to a TV position, the guide is relatively stationary with respect to the track. During the process of the mechanical extension device changing from a TV position to a lying position, the guide moves along the track so that the support assembly is supported on the ground.

2. The mechanical extension device according to claim 1, characterized in that, When the mechanical extension device is in a seated position, the track and the guide are in clearance fit, and / or when the mechanical extension device is in a TV position, the track and the guide are in clearance fit, and / or when the mechanical extension device is in a reclining position, the track and the guide are in clearance fit.

3. The mechanical extension device according to claim 2, characterized in that, The track is formed as a guide groove disposed in the oscillating assembly, the guide member is movably inserted into the guide groove, and the guide groove includes a proximal end and a distal end along a first direction; When the mechanical extension device is in the seated and TV positions, the guide is located at the distal end; when the mechanical extension device is in the reclining position, the guide is located at the proximal end.

4. The mechanical extension device according to claim 3, characterized in that, The inner wall of the proximal end is provided with a first cushioning pad, and the inner wall of the distal end is provided with a second cushioning pad; when the mechanical extension device is in a sitting position and a TV position, the guide contacts the second cushioning pad; when the mechanical extension device is in a lying position, the guide contacts the first cushioning pad.

5. The mechanical extension device according to claim 3, characterized in that, The surface of the guide is provided with a third buffer pad, which contacts the inner wall of the guide groove.

6. The mechanical extension device according to any one of claims 1 to 5, characterized in that, The guide element contacts the inner wall surface of the track.

7. The mechanical extension device according to any one of claims 1 to 5, characterized in that, The guide is fixedly connected to the support assembly, and the guide and the support assembly are detachably connected.

8. The mechanical extension device according to claim 7, characterized in that, The support assembly is provided with at least one first fastener, and the guide is fixedly connected to the support assembly via the first fastener.

9. The mechanical extension device according to any one of claims 1 to 5, characterized in that, The guide is rotatably connected to the support assembly, and the guide and the support assembly are detachably connected.

10. The mechanical extension device according to claim 9, characterized in that, The support assembly is provided with at least one first fastener, and the guide is rotatably connected to the support assembly via the first fastener so that the guide can rotate about the first fastener as an axis.

11. The mechanical extension device according to any one of claims 1 to 5, characterized in that, The guide has an arc surface, and the guide contacts the inner wall of the track through the arc surface. The connecting force between the guide and the swing assembly or the support assembly is greater than the frictional force generated by the guide moving along the track.

12. The mechanical extension device according to claim 1, characterized in that, The support assembly includes a first support rod, a second support rod, a third support rod, and a roller. One end of the first support rod is rotatably connected to the leg assembly, the other end of the first support rod is rotatably connected to one end of the second support rod, and the other end of the second support rod is connected to the roller. The third support rod includes a first straight section, a second straight section, and a first bent section. The first straight section and the second straight section are connected at an angle through the first bent section. The guide is disposed on the first bent section. The end of the first straight section is rotatably connected to the second support rod, and the end of the second straight section is rotatably connected to the swing assembly. During the process of the mechanical extension device changing from the TV position to the lying position, the second support rod lowers its height by rotating so that the roller is supported on the ground.

13. The mechanical extension device according to claim 12, characterized in that, The swing assembly includes a first swing rod, a second swing rod, a third swing rod, a fourth swing rod, a fifth swing rod, a sixth swing rod, and a seventh swing rod. The track is disposed on the first swing rod. One end of the first swing rod is rotatably connected to one end of the second swing rod, and the other end of the second swing rod is rotatably connected to one end of the third swing rod. The other end of the third swing rod is rotatably connected to the base. One end of the fourth swing rod is rotatably connected to the second swing rod, and the other end of the fourth swing rod is rotatably connected to one end of the fifth swing rod. The other end of the fifth swing rod is rotatably connected to the base. One end of the sixth swing rod is rotatably connected to the fifth swing rod, and the other end of the sixth swing rod is rotatably connected to the first swing rod. One end of the seventh swing rod is rotatably connected to the fourth swing rod, and the other end of the seventh swing rod is rotatably connected to the sixth swing rod. During the process of the mechanical extension device changing from a seated position to a TV position, the swing component is relatively stationary with respect to the base; during the process of the mechanical extension device changing from a TV position to a reclining position, the swing component moves relative to the base along a first direction. During the process of the mechanical extension device changing from the TV position to the lying position, the height of the sixth swing rod is greater than the height of the second swing rod. The second swing rod swings relative to the third swing rod in a third direction, and the sixth swing rod swings relative to the fifth swing rod in a fourth direction, so as to drive the second support rod to rotate and reduce its height through the third support rod.

14. The mechanical extension device according to claim 13, characterized in that, The base is fixedly provided with a first limiting member; when the mechanical extension device is in a seated or TV position, the third swing rod contacts the first limiting member to restrict the movement of the swing assembly.

15. The mechanical extension device according to claim 13, characterized in that, The base is fixedly provided with a second limiting member; when the mechanical extension device is in a seated or TV position, the fifth swing rod contacts the second limiting member to restrict the movement of the swing assembly.

16. The mechanical extension device according to claim 13, characterized in that, The base is fixedly provided with a third limiting member; when the mechanical extension device is in a lying position, the third swing rod contacts the third limiting member to restrict the movement of the swing assembly.

17. The mechanical extension device according to claim 13, characterized in that, The backrest assembly includes a backrest mounting plate and a backrest transmission assembly. The backrest mounting plate is used to mount the backrest and is rotatably connected to the base, and the tilt angle can be adjusted by rotation. The backrest transmission assembly includes a first backrest transmission rod, a second backrest transmission rod, and a third backrest transmission rod. One end of the first backrest transmission rod is rotatably connected to the backrest mounting plate, the other end of the first backrest transmission rod is rotatably connected to one end of the second backrest transmission rod, the other end of the second backrest transmission rod is rotatably connected to one end of the third backrest transmission rod, and the other end of the third backrest transmission rod is rotatably connected to the base. The third backrest transmission rod is fixedly provided with a fourth limiting member; when the mechanical extension device is in a sitting position or a TV position, the fourth limiting member contacts the base to support the base.

18. The mechanical extension device according to claim 17, characterized in that, The base is fixedly provided with a fifth limiting member; when the mechanical extension device is in a seated position, the third backrest transmission rod contacts the fifth limiting member to restrict the rotation of the third backrest transmission rod.

19. The mechanical extension device according to claim 17, characterized in that, The base is fixedly provided with a sixth limiting member; when the mechanical extension device is in a reclining position, the third backrest transmission rod contacts the sixth limiting member to restrict the rotation of the third backrest transmission rod.

20. The mechanical extension device according to claim 17, characterized in that, The base is fixedly provided with a seventh limiting member, and the end of the second backrest transmission rod away from the first backrest transmission rod is provided with a first protrusion. When the mechanical extension device is in the seated position and / or TV position, the first protrusion contacts the seventh limiting member to restrict the rotation of the second backrest transmission rod.

21. The mechanical extension device according to claim 17, characterized in that, The base is fixedly provided with an eighth limiting member, the backrest mounting plate is provided with a recessed portion, the inner wall of the recessed portion includes a first limiting edge and a second limiting edge, and the eighth limiting member is located within the range of the recessed portion; When the mechanical extension device is in a seated position and / or a TV position, the eighth limiting member contacts the first limiting edge to restrict the rotation of the backrest mounting plate; when the mechanical extension device is in a reclining position, the eighth limiting member contacts the second limiting edge to restrict the rotation of the backrest mounting plate.

22. The mechanical extension device according to any one of claims 1-5, 8, 10, 12-21, characterized in that, The leg assembly includes a leg telescopic assembly and a leg transmission assembly, wherein the leg transmission assembly is used to drive the leg telescopic assembly to extend or retract. The leg extension assembly includes a first leg link, a second leg link, a third leg link, a fourth leg link, and a leg support mounting assembly. One end of the first leg link is rotatably connected to the base, and the other end of the first leg link is rotatably connected to one end of the second leg link. The other end of the second leg link is rotatably connected to the leg support mounting assembly. One end of the third leg link is rotatably connected to the base, and the other end of the third leg link is rotatably connected to one end of the fourth leg link. The other end of the fourth leg link is rotatably connected to the leg support mounting assembly. The rotatable connection position of the first leg link to the base is higher than the rotatable connection position of the second leg link to the base. The leg transmission assembly is rotatably connected to the first leg link. The fourth leg link is fixedly provided with a ninth limiting member; when the mechanical extension device is in the TV position or lying position, the first leg link contacts the ninth limiting member to restrict the rotation of the first leg link.

23. The mechanical extension device according to any one of claims 1-5, 8, 10, 12-21, characterized in that, The leg transmission assembly includes a first leg transmission rod and a second leg transmission rod. One end of the first leg transmission rod is rotatably connected to the first leg connecting rod, and the other end of the first leg transmission rod is rotatably connected to one end of the second leg transmission rod. The second leg transmission rod is rotatably connected to the base. The swing assembly is rotatably connected to the second leg transmission rod, and the support assembly is rotatably connected to the second leg transmission rod. When the second leg drive rod rotates, it drives the leg extension assembly to extend or retract via the first leg drive rod.

24. The mechanical extension device according to claim 23, characterized in that, The swing assembly includes a first swing rod, which is rotatably connected to the second leg transmission rod. A tenth limiting member is fixedly provided at the end of the first swing rod near the leg transmission assembly. When the mechanical extension device is in the TV position and / or lying position, the second leg drive rod contacts the tenth limiting member to restrict the rotation of the second leg drive rod.

25. The mechanical extension device according to claim 24, characterized in that, When the mechanical extension device is in a seated and / or lying position, the second leg drive rod contacts the tenth limiting member to restrict the rotation of the second leg drive rod; When the mechanical extension device is in a sitting or lying position, the second leg transmission rod contacts the tenth limiting member at different positions.

26. The mechanical extension device according to claim 23, characterized in that, The base is fixedly provided with an eleventh limiting member, and the second leg transmission rod is provided with a second protrusion; When the mechanical extension device is in a seated position, the second protrusion contacts the eleventh limiting member to restrict the rotation of the second leg drive rod.

27. The mechanical extension device according to any one of claims 1 to 21, characterized in that, The drive device includes a driver and a drive rod inserted into the driver, the leg assembly includes a second leg transmission rod, the swing assembly includes a third swing rod, the driver is connected to the third swing rod, and the drive rod is connected to the second leg transmission rod.

28. The mechanical extension device according to claim 27, characterized in that, The third swing rod is fixedly connected to a support structure, and the support structure is fixedly connected to a first ear plate extending toward the driver, and the driver is rotatably connected to the first ear plate. The second leg drive rod is fixedly connected to an extension plate, the extension plate extends along a first direction, the connecting structure is fixedly connected to the extension plate, the connecting structure is fixedly connected to a second ear plate extending toward the drive rod, and the drive rod is rotatably connected to the second ear plate.

29. A seat unit, characterized in that, The device includes a seat cushion, a backrest, a leg rest, and a mechanical extension device as described in any one of claims 1 to 28, wherein the seat cushion is connected to the base, the backrest is connected to the backrest assembly, and the leg rest is connected to the leg assembly. When the mechanical extension device is in a reclining position, the angle between the seat cushion and the horizontal plane is 14°-26°, and the height of the leg assembly is greater than the height of the backrest assembly.

Images