Mechanical extension device for a rocking seat

Abstract

The application provides a mechanical stretching device of a rocking seat, which comprises a base, a first rocking rod, a second rocking rod, an actuator and two mechanical stretching units. The first rocking rod and the second rocking rod are rotationally connected to the base. The mechanical stretching units are rotationally connected to the first rocking rod and the second rocking rod, so that the mechanical stretching units can rock relative to the base. The actuator is arranged between the two mechanical stretching units, so that the mechanical stretching device has the ability of state switching. A second connecting rod rotationally connected to the second rocking rod in the mechanical stretching unit is provided with a locking member. The base is provided with a guide groove and a locking groove opened in the guide groove. The guide groove is open to one side. The locking member can enter the guide groove from the open side of the guide groove. When the rocking member moves while rocking, the locking member can also enter the locking groove through the guide groove without obstruction, so as to lock the rocking of the mechanical stretching unit relative to the base in a lying position, thereby avoiding failure.

Description

Technical Field

[0001] This invention relates to the field of furniture, and in particular to a mechanical extension device for a rocking seat. Background Technology

[0002] With the improvement of domestic productivity and the development of social economy, people's living standards are getting higher and higher, and their requirements for furniture are also getting higher and higher; sofas, rocking chairs, chairs and other furniture can be seen everywhere, and some sofas can even swing back and forth.

[0003] In the existing technology, there are various movable seats, such as rocking chairs, swing chairs, and sofas with rocking functions. These seats have built-in mechanical extension devices, which usually have a base, backrest support, seat support, and tilting mechanism, and can change between several different postures. The mechanical extension devices of seats that can swing back and forth also have a swinging mechanism to realize the swinging function. Compared with ordinary movable seats, they provide a more comfortable and novel sitting experience, and therefore are gradually emerging in the domestic market.

[0004] Such swing-function seating, or sofas, require locking the swing motion in a reclining position. However, in existing swing sofas, the limiting pin used to lock the swing motion cannot enter the limiting groove after the mechanical extension device swings. This means that swinging and state switching cannot occur simultaneously, and the sofa cannot lock the swing motion in a reclining position while swinging. Furthermore, if the limiting pin cannot enter the limiting groove, it will get stuck between other rods of the mechanical extension device. If the state is forcibly switched to the mechanical extension device, it is easy to damage the rods or limiting pin, which in turn leads to malfunction of the mechanical extension device and increases maintenance costs. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a mechanical extension device for a rocking seat, comprising a base, a first rocking rod, a second rocking rod, an actuator, and two mechanical extension units. The first and second rocking rods are rotatably connected to the base, and the mechanical extension units are rotatably connected to the first and second rocking rods. The mechanical extension units are no longer directly rotatably connected to the base; a transition between them is achieved through the first and second rocking rods, allowing the mechanical extension units to swing relative to the base. The actuator is positioned between the two mechanical extension units and drives their movement, enabling the mechanical extension device to switch states. A locking element is provided on a second connecting rod rotatably connected to the second rocking rod in each mechanical extension unit. The base has a guide groove and a locking groove formed within the guide groove. The guide groove is open to one side, allowing the locking element to enter the guide groove from the open portion. During the rocking motion of the mechanical extension units, the locking element can also be guided unimpeded through the guide groove into the locking groove, thus locking the swing of the mechanical extension units relative to the base in a reclining position and preventing malfunctions.

[0006] The technical solution of this invention is implemented as follows: A mechanical extension device for a rocking seat includes a base, a first rocking rod, a second rocking rod, an actuator, and two mechanical extension units symmetrically arranged on the left and right. The first and second rocking rods are rotatably connected to the base, one in front of the other, and the two mechanical extension units are rotatably connected to both the first and second rocking rods. The first and second rocking rods are configured to cause the mechanical extension units to rock on the base. The actuator is located between the two mechanical extension units and drives the mechanical extension units to move. Each mechanical extension unit includes a linkage rod, a seat connector, a backrest connector, a footrest connector, a footrest linkage assembly, a first link, and a second link. The seat connector is configured to connect to the seat, the backrest connector is configured to connect to the backrest, and the footrest connector is configured to connect to the footrest. The footrest connector is mounted on the footrest linkage assembly, which is configured to extend and retract under the action of the actuator and control the footrest connector to close or extend. The footrest linkage assembly is located at the front end of the seat connector, and the backrest connector is located at the rear end of the seat connector. The first link and the second link are rotatably connected to the base. A swing arm is rotatably connected, and a second connecting rod is rotatably connected to the second swing arm; an actuator is rotatably connected to the seat connector and the footrest connecting rod assembly respectively, driving the two to move relative to each other; both ends of the linkage rod are rotatably connected to the footrest connecting rod assembly and the second connecting rod respectively, and when the actuator drives the footrest connecting rod assembly to move, the linkage rod drives the second connecting rod to move; the second connecting rod is provided with a locking element, and a guide groove with one side open is provided on the base, with a locking groove provided at the end of the path of the guide groove; it also has a sitting posture for human body to sit and a reclining posture for human body to lie down. In the reclining position, the footrest linkage assembly is folded in front of the seat connector in the sitting position, and the backrest connector is roughly vertical. When switching from the sitting position to the reclining position, the footrest linkage assembly extends under the drive of the actuator and drives the second linkage to move through the linkage rod. The second linkage causes the backrest connector to tilt backward. At the same time, the locking member enters the guide groove from the open side of the guide groove and is guided by the guide groove to the locking groove until the locking member is located in the locking groove and locks the relative swing between the mechanical extension unit and the base. At this time, the reclining position is switched.

[0007] The mechanical extension units are no longer directly rotatably connected to the base. Instead, they are oscillating on the base via a first and second swing rod, allowing them to swing back and forth relative to the base and improving seating comfort. Because an actuator is located between the two mechanical extension units, the rods of both units cannot move when the actuator is locked. This allows the mechanical extension units to swing as a whole on the base without interference, and there is no relative movement between the rods. One side of the guide groove is open, so even when the mechanical extension units swing relative to the base, the locking element can still enter the locking groove unimpeded and guided, preventing jamming or damage to the rods, thus avoiding malfunctions and saving maintenance costs. The actuator is not connected to the base but to the seat connector and footrest linkage assembly, which is also one of the foundations for the swinging of the mechanical extension units.

[0008] Preferably, the guide groove is an upward-opening V-shaped groove with an opening angle ranging from 120° to 150°. The guide groove opening is a relatively large obtuse angle, providing sufficient clearance for the locking element to move within the guide groove as the mechanical extension unit swings, ensuring that the movement of the locking element is not obstructed.

[0009] Preferably, the wall of the guide groove serves as a guide surface. This guide surface is configured such that while the mechanical extension unit is driven by an actuator to move, it oscillates relative to the base. The locking element can still intermittently contact the guide surface and approach the locking groove without obstruction. The locking element is not always in contact with the guide groove. First, when the mechanical extension unit is not oscillating, the locking element moves along a predetermined trajectory under the preset configuration of the links within the mechanical extension unit, allowing it to enter the locking groove without obstruction. The guide groove is unnecessary for guidance; this is the most basic requirement. However, when the mechanical extension unit oscillates, the locking element also oscillates, no longer moving along a predetermined trajectory. The trajectory becomes more random, but the movement of the locking element always remains within a certain oscillation range, similar to a fan shape. The guide groove's function is to constrain this fan-shaped range, thereby constraining the oscillation range of the locking element. However, if the oscillation of the locking element is too large… The locking element will be blocked by the guide surface to prevent it from leaving the guide groove and swinging within its predetermined range. As the locking element moves downward, its swing range becomes smaller and smaller due to the influence of the V-shaped guide groove, and eventually it can only enter the locking groove at the end of the guide groove. Through the above scheme, the movement trajectory of the locking element is not locked in a single way, that is, the locking element does not move along a single movement trajectory, so that the mechanical extension unit can swing relative to the base. However, locking the range of the movement trajectory of the locking element, or locking the end point of the movement of the locking element, can ensure that the locking element can be safely and unimpeded into the locking groove every time, avoiding the failure of the locking element jamming with other rods.

[0010] Preferably, the upper ends of the first and second swing arms are rotatably connected to the base, and their lower ends are rotatably connected to the mechanical extension units. The front parts of the two mechanical extension units are rotatably connected to the first swing arm, and the rear parts of the two mechanical extension units are rotatably connected to the second swing arm. When the actuator stops and the mechanical extension units swing relative to the base, the first and second swing arms rotate synchronously. The mechanical extension units are connected to the lower ends of the two swing arms, which helps to reduce the overall height of the mechanical extension device, thereby reducing the seat height and improving comfort.

[0011] Preferably, the base includes a support base and a base plate. The base plate is fixedly connected to the support base. The base plate has a first connecting portion and a second connecting portion located at its front and rear ends. The first connecting portion protrudes forward and upward, and the second connecting portion protrudes backward and upward. A first swing rod is rotatably connected to the upper end of the first connecting portion, and a second swing rod is rotatably connected to the upper end of the second connecting portion. The first and second swing rods hang down beside the base plate. The upward protrusion of the first and second connecting portions ensures that the first and second swing rods have sufficient height to rotate relative to the base, allowing the mechanical extension unit to swing smoothly relative to the base. The downward hanging of the first and second swing rods beside the base plate reduces the connection height of the mechanical extension unit, ensuring that the upward protrusion of the first and second connecting portions does not significantly affect the seat height. This allows the mechanical extension device to maintain a low seat height, thereby improving seating comfort.

[0012] Preferably, the guide groove and locking groove are formed on the substrate, and the guide groove and locking groove are located between the first connecting part and the second connecting part and in the middle of the substrate; the locking member is located at the upper end of the second link. When switching from a sitting position to a lying position, the second link rotates forward, and the locking member passes over the second connecting part and enters the guide groove.

[0013] Preferably, the second link is also rotatably connected to a seat link and a backrest link. One end of the backrest link is rotatably connected to the second link, and the other end is rotatably connected to the lower end of the backrest connector. The lower end of the seat link is rotatably connected to the second link, and the upper end of the seat link is fixedly connected to the seat connector. When the second link rotates forward, the backrest link causes the backrest connector to tilt backward relative to the seat connector, and the seat link causes the seat connector to descend. The second link is also connected to the backrest link and the seat link. When the second link is driven by the linkage, it synchronously drives the backrest link and the seat link, causing the backrest connector and the seat connector to move together, realizing the overall movement of the mechanical extension unit. This reduces the number of links and simplifies the structure of the mechanical extension unit.

[0014] Preferably, the upper end of the first connecting rod is fixedly connected to the front part of the seat connector, and the seat connecting rod is fixedly connected to the rear part of the seat connector. The first connecting rod and seat connecting rod are configured such that when switching from a sitting to a reclining position, the first connecting rod maintains the height of the front part of the seat connector unchanged, while the seat connecting rod causes the rear part of the seat connector to sink. This design achieves a low-position, high-legged posture, improving seating comfort.

[0015] Preferably, the actuator is connected to the mechanical extension unit via a first drive tube and a second drive tube. The first drive tube is connected to the footrest linkage assembly, and the second drive tube is connected to the seat linkage. A single actuator enables the two mechanical extension units to move synchronously.

[0016] Preferably, the footrest linkage assembly includes a first footrest linkage, a second footrest linkage, a third footrest linkage, and a fourth footrest linkage. The upper ends of the first and second footrest linkages are rotatably connected to the seat connector. The connection point between the first footrest linkage and the seat connector is located behind the connection point between the second footrest linkage and the seat connector. The lower end of the first footrest linkage is rotatably connected to one end of the third footrest linkage, and the other end of the third footrest linkage is rotatably connected to the footrest connector. The lower end of the second footrest linkage is rotatably connected to one end of the fourth footrest linkage, and the other end of the fourth footrest linkage is rotatably connected to the footrest connector. The lower part of the second footrest linkage is also rotatably connected to the third footrest linkage. The middle part of the first footrest linkage is rotatably connected to the linkage rod. The first drive tube is fixedly connected to the second footrest linkage of the footrest linkage assembly.

[0017] Preferably, the base includes a rotating base and a base plate. The rotating base includes a rotating seat and a base. The rotating seat is rotatably mounted on the base, and the base plate is fixedly mounted on the rotating seat. A first swing rod and a second swing rod are rotatably connected to the base. The mechanical extension unit is rotatably connected to the first swing rod and the second swing rod. The rotating seat is configured such that it drives the mechanical extension unit to rotate synchronously when it rotates. A plurality of balls are provided between the rotating seat and the base. Ball grooves are formed on the opposing surfaces of the rotating seat and the base, and the balls are located in the ball grooves. The rotating seat rotates relative to the base through the balls. This allows the seat, backrest, and footrest of the seating to rotate, and the user's seating orientation also rotates, allowing the user to sit facing different directions.

[0018] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows: The mechanical extension units are no longer directly rotatably connected to the base. Instead, they are oscillating on the base via a first and a second swing rod, allowing them to swing back and forth relative to the base and improve seating comfort. Because an actuator is located between the two mechanical extension units, the rods of both units cannot move when the actuator is locked. This allows the mechanical extension units to swing as a whole on the base without interference, and there is no relative movement between the rods. One side of the guide groove is open, so even when the mechanical extension units swing relative to the base, the locking element can still enter the locking groove unimpeded and guided. The actuator is not connected to the base but to the seat connector and the footrest linkage assembly, which is also one of the foundations for realizing the swinging of the mechanical extension units.

[0019] The locking element is not always in contact with the guide groove. Firstly, when the mechanical extension unit is not swinging, the locking element moves along a predetermined trajectory under the preset configuration of the links in the mechanical extension unit, allowing it to enter the locking groove without obstruction. The guide groove is unnecessary; this is the most basic requirement. However, when the mechanical extension unit swings, the locking element also swings, no longer moving along the predetermined trajectory, and the trajectory becomes more random. However, the movement trajectory of the locking element always remains within a certain swing range, which is similar to a fan shape. The function of the guide groove is to constrain this fan-shaped range, thereby constraining the swing range of the locking element. But if the swing of the locking element is too large… The locking element will be blocked by the guide surface to prevent it from leaving the guide groove and swinging within its predetermined range. As the locking element moves downward, its swing range becomes smaller and smaller due to the influence of the V-shaped guide groove, and eventually it can only enter the locking groove at the end of the guide groove. Through the above scheme, the movement trajectory of the locking element is not locked in a single way, that is, the locking element does not move along a single movement trajectory, so that the mechanical extension unit can swing relative to the base. However, locking the range of the movement trajectory of the locking element, or locking the end point of the movement of the locking element, can ensure that the locking element can be safely and unimpeded into the locking groove every time, avoiding the failure of the locking element jamming with other rods. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the mechanical extension device in the seated state in Embodiment 1 of the present invention; Figure 2 This is a three-dimensional structural diagram of the mechanical extension device in the lying position in Embodiment 1 of the present invention; Figure 3 This is an exploded view of the mechanical extension device of the present invention in a seated position in Embodiment 1; Figure 4 This is a side view of the first and second swing rods connected to the base in Embodiment 1 of the present invention; Figure 5This is a side view of the mechanical extension device in the seated position in Embodiment 1 of the present invention. Figure 1 ; Figure 6 This is a side view of the mechanical extension device in the lying position in Embodiment 1 of the present invention. Figure 1 ; Figure 7 This is a side view of the mechanical extension device in the seated position in Embodiment 1 of the present invention. Figure 2 ; Figure 8 This is a side view of the mechanical extension device in the lying position in Embodiment 1 of the present invention. Figure 2 ; Figure 9 This is a schematic diagram of the fan-shaped motion trajectory of the locking member during the swinging of the mechanical extension unit in Embodiment 1 of the present invention; Figure 10 This is a three-dimensional structural diagram of the substrate and the rotating base when they are installed in Embodiment 2 of the present invention; Figure 11 This is a three-dimensional structural diagram of the rotating base in Embodiment 2 of the present invention.

[0021] The reference numerals in the accompanying drawings are as follows: base 1; support 101; base plate 102; first connecting part 1021; second connecting part 1022; first swing rod 2; second swing rod 3; actuator 4; mechanical extension unit 5; linkage rod 6; seat connecting member 7; backrest connecting member 8; footrest connecting member 9; first connecting rod 10; second connecting rod 11; locking member 12; guide groove 13; guide surface 131; locking groove 14; first fixing rod 15; second fixing rod 16; seat connecting rod 17; backrest connecting rod 18; first drive tube 19; second drive tube 20; first footrest connecting rod 21; second footrest connecting rod 22; third footrest connecting rod 23; fourth footrest connecting rod 24; rotating seat 25; fixed seat 26; ball bearing 27; circular frame 28. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0024] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] The specific embodiments of the present invention are as follows: Example

[0026] like Figure 1 , 2 As shown, the present invention provides a mechanical extension device for a rocking seat, including a base 1, a first rocking rod 2, a second rocking rod 3, an actuator 4, and two mechanical extension units 5 symmetrically arranged on the left and right. The first rocking rod 2 and the second rocking rod 3 are rotatably connected to the base 1 one after the other, and the two mechanical extension units 5 are rotatably connected to both the first rocking rod 2 and the second rocking rod 3. The first rocking rod 2 and the second rocking rod 3 are configured to cause the mechanical extension units 5 to swing on the base 1. The actuator 4 is disposed between the two mechanical extension units 5 and drives the mechanical extension units 5 to move. The display unit 5 includes a linkage rod 6, a seat connector 7, a backrest connector 8, a footrest connector 9, a footrest linkage assembly, a first linkage 10, and a second linkage 11. The seat connector 7 is configured to connect to the seat, the backrest connector 8 is configured to connect to the backrest, and the footrest connector 9 is configured to connect to the footrest. The footrest connector 9 is mounted on the footrest linkage assembly, which is configured to extend and retract under the action of the actuator 4 and control the retraction or extension of the footrest connector 9. The footrest linkage assembly is located at the front end of the seat connector 7, and the backrest connector 8 is located at the rear end of the seat connector 7. The first linkage 10 is connected to the first... The swing rod 2 is rotatably connected, and the second connecting rod 11 is rotatably connected to the second swing rod 3; the actuator 4 is rotatably connected to the seat connector 7 and the footrest connecting rod assembly respectively and drives the two to move relative to each other; the two ends of the linkage rod 6 are rotatably connected to the footrest connecting rod assembly and the second connecting rod 11 respectively. When the actuator 4 drives the footrest connecting rod assembly to move, the linkage rod 6 drives the second connecting rod 11 to move; the second connecting rod 11 is provided with a locking member 12, and the base 1 is provided with a guide groove 13 with one side open. A locking groove 14 is provided at the end of the path of the guide groove 13; it also has a sitting posture for human beings to sit and a lying posture for human beings to lie down. In the reclining position, the footrest linkage assembly is folded in front of the seat connector 7 in the sitting position, and the backrest connector 8 is roughly vertical. When switching from the sitting position to the reclining position, the footrest linkage assembly extends under the drive of the actuator 4 and is driven by the linkage rod 6 to move the second linkage 11. The second linkage 11 causes the backrest connector 8 to tilt backward. At the same time, the locking member 12 enters the guide groove 13 from the open side of the guide groove 13 and is guided by the guide groove 13 to the locking groove 14 until the locking member 12 is located in the locking groove 14 and locks the relative swing of the mechanical extension unit 5 and the base 1. At this time, the reclining position is switched.

[0027] The mechanical extension unit 5 is no longer directly rotatably connected to the base 1. Instead, it is oscillating on the base 1 via the first swing rod 2 and the second swing rod 3, allowing it to swing back and forth relative to the base 1 and improve seating comfort. Since the actuator 4 is located between the two mechanical extension units 5, the rods of the two mechanical extension units 5 cannot move when the actuator 4 is locked. This allows the mechanical extension units 5 to swing as a whole on the base 1 without interference, and there is no relative movement between the rods of the mechanical extension units 5. One side of the guide groove 13 is open, so even when the mechanical extension unit 5 swings relative to the base 1, the locking member 12 can still enter the locking groove 14 unobstructed and guided, preventing jamming or damage to the rods, thus avoiding malfunctions and saving maintenance costs. The actuator 4 is not connected to the base 1 but to the seat connector 7 and the footrest linkage assembly, which is also one of the foundations for the swinging of the mechanical extension unit 5.

[0028] like Figure 8 As shown, the guide groove 13 is an upward-opening V-shaped groove with an opening angle ranging from 120° to 150°. In this embodiment, the opening angle of the guide groove 13 is 132°. The groove wall of the guide groove 13 is a guide surface 131. The guide surface 131 is configured such that the mechanical extension unit 5 is driven by the actuator 4 to move while swaying relative to the base 1. The locking member 12 can still intermittently contact the guide surface 131 and move towards the locking groove 14 without obstruction. The opening of the guide groove 13 is an obtuse angle with a large angle, giving it sufficient clearance space for the locking member 12 to move in the guide groove 13 with the swaying of the mechanical extension unit 5. The movement of the locking member 12 is not obstructed. Specifically, as Figure 9As shown, the locking member 12 is not always in contact with the guide groove 13. First, when the mechanical extension unit 5 is not swinging, the locking member 12 moves along a predetermined trajectory under the preset configuration of each rod of the mechanical extension unit 5, and can enter the locking groove 14 without obstruction. There is no need for the guide groove 13 to play a guiding role, which is the most basic requirement. When the mechanical extension unit 5 swings, the locking member 12 will also swing accordingly, no longer moving along the predetermined trajectory, and the trajectory becomes more random. However, the movement trajectory of the locking member 12 will always be within a swing range, which is similar to a fan shape. The function of the guide groove 13 is to constrain this fan-shaped range, thereby constraining the swing range of the locking member 12. However, when the swing of the locking member 12 is too large, the locking... The locking member 12 will be blocked by the guide surface 131, preventing it from leaving the guide groove 13 and its predetermined swing range. As the locking member 12 moves downward, its swing range becomes smaller and smaller due to the influence of the V-shaped guide groove 13, and eventually it can only enter the locking groove 14 at the end of the guide groove 13. Through the above scheme, the movement trajectory of the locking member 12 is not locked in a single way, that is, the locking member 12 does not move along a single movement trajectory, so that the mechanical extension unit 5 can swing relative to the base 1. However, locking the range of the movement trajectory of the locking member 12, or locking the end point of the movement of the locking member 12, can ensure that the locking member 12 can be safely and unobstructedly locked into the locking groove 14 every time, avoiding the failure of the locking member 12 getting stuck with other rods.

[0029] like Figure 3 , 4 As shown, the upper ends of the first swing rod 2 and the second swing rod 3 are rotatably connected to the base 1, and the lower ends of both are rotatably connected to the mechanical extension unit 5. The front parts of the two mechanical extension units 5 are rotatably connected to the first swing rod 2, and the rear parts of the two mechanical extension units 5 are rotatably connected to the second swing rod 3. When the actuator 4 stops and the mechanical extension unit 5 swings relative to the base 1, the first swing rod 2 and the second swing rod 3 rotate synchronously. The mechanical extension unit 5 is connected to the lower ends of the two swing rods, which helps to reduce the height of the entire mechanical extension device, thereby reducing the seat height and improving comfort.

[0030] The base 1 includes a support 101 and a substrate 102. The substrate 102 is fixedly connected to the support 101. The substrate 102 has a first connecting portion 1021 and a second connecting portion 1022 located at its front and rear ends. The first connecting portion 1021 protrudes forward and upward, and the second connecting portion 1022 protrudes backward and upward. A first swing rod 2 is rotatably connected to the upper end of the first connecting portion 1021, and a second swing rod 3 is rotatably connected to the upper end of the second connecting portion 1022. The first swing rod 2 and the second swing rod 3 hang down beside the substrate 102. The guide groove 13 and the locking groove 14 are formed on the substrate 102, located between the first connecting portion 1021 and the second connecting portion 1022 and in the middle of the substrate 102. The stop 12 is located at the upper end of the second link 11. When switching from a sitting position to a lying position, the second link 11 rotates forward, and the stop 12 passes over the second connecting part 1022 and enters the guide groove 13. The first connecting part 1021 and the second connecting part 1022 protrude upward, ensuring that the first swing rod 2 and the second swing rod 3 have sufficient height to rotate relative to the base 1, so that the mechanical extension unit 5 can swing smoothly relative to the base 1. The first swing rod 2 and the second swing rod 3 hang down on the side of the base plate 102, which also reduces the connection height of the mechanical extension unit 5, so that the upward protruding first connecting part 1021 and the second connecting part 1022 will not affect the height of the seat surface too much, so that the mechanical extension device can still maintain a low seat surface height to improve sitting comfort.

[0031] The support base 101 is a U-shaped frame. Vertical base plates 102 are provided on both the left and right sides of the support base 101. A first swing rod 2 and a second swing rod 3 are rotatably connected on each base plate 102. The first swing rods 2 on both sides are connected by a first fixed rod 15 arranged laterally in the left and right direction. The second swing rods 3 on both sides are connected by a second fixed rod 16 arranged laterally in the left and right direction. The swing of the mechanical extension units 5 on both sides is synchronized by the first fixed rod 15 and the second fixed rod 16.

[0032] like Figure 5-8 As shown, a seat link 17 and a backrest link 18 are rotatably connected to the second link 11. One end of the backrest link 18 is rotatably connected to the second link 11, and the other end of the backrest link 18 is rotatably connected to the lower end of the backrest connector 8. The lower end of the seat link 17 is rotatably connected to the second link 11, and the upper end of the seat link 17 is fixedly connected to the seat connector 7. When the second link 11 rotates forward, the backrest link 18 causes the backrest connector 8 to tilt backward relative to the seat connector 7, and the seat link 17 causes the seat connector 7 to descend. When the second link 11 is driven by the linkage 6, it simultaneously drives the backrest link 18 and the seat link 17, so that the backrest connector 8 and the seat connector 7 move together, realizing the overall movement of the mechanical extension unit 5.

[0033] The upper end of the first connecting rod 10 is fixedly connected to the front of the seat connector 7, and the seat connecting rod 17 is fixedly connected to the rear of the seat connector 7. The first connecting rod 10 and the seat connecting rod 17 are configured such that when switching from a sitting position to a reclining position, the first connecting rod 10 keeps the front of the seat connector 7 at a constant height, while the seat connecting rod 17 causes the rear of the seat connector 7 to sink. This design achieves a low-position, high-legged posture, improving seating comfort.

[0034] Actuator 4 is connected to mechanical extension unit 5 via first drive tube 19 and second drive tube 20. First drive tube 19 is connected to footrest linkage assembly, and second drive tube 20 is connected to seat linkage 17. Two mechanical extension units 5 move synchronously via a single actuator 4. Footrest linkage assembly includes first footrest linkage 21, second footrest linkage 22, third footrest linkage 23, and fourth footrest linkage 24. The upper rotating ends of first footrest linkage 21 and second footrest linkage 22 are rotatably connected to seat connector 7. The connection point between first footrest linkage 21 and seat connector 7 is located at the second footrest linkage. Behind the connection point between 22 and the seat connector 7, the lower end of the first footrest link 21 is rotatably connected to one end of the third footrest link 23, and the other end of the third footrest link 23 is rotatably connected to the footrest connector 9. The lower end of the second footrest link 9 is rotatably connected to one end of the fourth footrest link 24, and the other end of the fourth footrest link 24 is rotatably connected to the footrest connector 9. The lower part of the second footrest link 22 is also rotatably connected to the third footrest link 23. The middle part of the first footrest link 21 is rotatably connected to the linkage rod 6. The first drive tube 19 is fixedly connected to the second footrest link 22 of the footrest link assembly.

[0035] Actuator 4 is an electric push rod. When actuator 4 drives the mechanical extension device to switch from a sitting position to a reclining position, the second footrest link 22 rotates forward, causing the entire footrest link assembly to extend forward. The first footrest link 21 drives the linkage rod 6 to move forward, and the linkage rod 6 in turn drives the second link 11 to rotate forward. The second link 11 then drives the seat link 17 and the backrest link 18 to move, causing the backrest connector 8 to tilt backward relative to the seat connector 7, and the rear of the seat connector 7 to sink. At the same time, the locking member 12 is engaged in the locking groove 14. The first swing rod 2 and the second swing rod 3 only stop the swing function of the mechanical extension unit 5 after the locking member 12 is engaged in the locking groove 14.

[0036] Example 2: The only difference between this example and Example 1 is the base 1.

[0037] Specifically, such as Figure 10 , 11As shown, the base 1 includes a rotating base and a base plate 102. The rotating base includes a rotating seat 25 and a fixed seat 26. A plurality of balls 27 are provided between the rotating seat 25 and the fixed seat 26. Circular ball grooves are opened on the opposing surfaces of the rotating seat 25 and the fixed seat 26. The balls 27 are located in two ball grooves. The rotating seat 25 is rotatably mounted on the fixed seat 26 via the balls 27. The base plate 102 is fixedly mounted on the rotating seat 25. The base plate 102 in this embodiment is the same as the base plate 102 in embodiment 1. The first swing rod 2 and the second swing rod 3 are rotatably connected to the base plate 102. The mechanical extension unit 5 is rotatably connected to the first swing rod 2 and the second swing rod 3. When the rotating seat 25 rotates relative to the fixed seat 26, the rotating seat 25 drives the mechanical extension unit 5 to rotate together, thereby realizing the rotation of the seat, backrest, and footrest of the chair. The orientation of the user also changes, allowing the user to sit facing different directions.

[0038] The fixed base 26 includes a circular frame 28, and the rotating base 25 is located at the center of the circular frame 28. When the rotating base 25 drives the mechanical extension unit 5 to rotate, the change in the orientation of the human body will cause the force direction of the fixed base 26 to change. The circular frame 28 can effectively adapt to this change. No matter which direction the rotating base 25 rotates, the circular frame 28 can maintain the overall stability of the mechanical extension device and prevent tipping.

Claims

1. A mechanical extension device for a rocking seat, characterized in that: The device includes a base, a first swing rod, a second swing rod, an actuator, and two mechanical extension units symmetrically arranged on the left and right. The first and second swing rods are rotatably connected to the base, one in front of the other, with a gap between them. Both mechanical extension units are rotatably connected to the first and second swing rods. The first and second swing rods are configured to allow the mechanical extension units to swing on the base. The actuator is located between the two mechanical extension units and drives their movement. Each mechanical extension unit includes a linkage rod, a seat connector, a backrest connector, a footrest connector, a footrest linkage assembly, a first link, and a second link. The seat connector connects to the seat, the backrest connector connects to the backrest, and the footrest connector connects to the footrest. The footrest connector is mounted on the footrest linkage assembly, which is configured to extend and retract under the action of the actuator and control the footrest connector's retraction or extension. The footrest linkage assembly is located at the front end of the seat connector, and the backrest connector is located at the rear end of the seat connector. The first link is rotatably connected to the first swing rod. The second link is rotatably connected to the second swing rod; the actuator is rotatably connected to the seat connector and the footrest link assembly respectively and drives the two to move relative to each other; the two ends of the linkage rod are rotatably connected to the footrest link assembly and the second link respectively. When the actuator drives the footrest link assembly to move, the linkage rod drives the second link to move; the second link is provided with a locking element, and the base is provided with a guide groove with one side open. A locking groove is provided at the end of the path of the guide groove; it also has a sitting posture for human beings to sit and a lying posture for human beings to lie down. In the seated position, the footrest linkage assembly is folded in front of the seat connector, and the backrest connector is roughly vertical. When switching from the seated position to the reclining position, the footrest linkage assembly extends under the drive of the actuator and the linkage rod drives the second linkage to move. The second linkage causes the backrest connector to tilt backward. At the same time, the locking member enters the guide groove from the open side of the guide groove and is guided by the guide groove to the locking groove until the locking member is located in the locking groove and locks the relative swing between the mechanical extension unit and the base. At this time, the reclining position is switched.

2. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The guide groove is an upward-opening V-shaped groove with an opening angle ranging from 120° to 150°.

3. The mechanical extension device of the rocking seat according to claim 2, characterized in that: The groove wall of the guide groove is a guide surface. The guide surface is configured as a mechanical extension unit. While the mechanical extension unit is driven by the actuator to move, it swings relative to the base. The locking element can still intermittently contact the guide surface and move towards the locking groove without obstruction.

4. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The upper ends of the first and second swing rods are rotatably connected to the base, and the lower ends of both are rotatably connected to the mechanical extension unit. The front parts of the two mechanical extension units are rotatably connected to the first swing rod, and the rear parts of the two mechanical extension units are rotatably connected to the second swing rod. When the actuator stops and the mechanical extension unit swings relative to the base, the first and second swing rods rotate synchronously.

5. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The base includes a support base and a substrate. The substrate is fixedly connected to the support base. The substrate has a first connecting portion and a second connecting portion located at the front and rear ends. The first connecting portion protrudes forward and upward, and the second connecting portion protrudes backward and upward. A first swing rod is rotatably connected to the upper end of the first connecting portion, and a second swing rod is rotatably connected to the upper end of the second connecting portion. The first swing rod and the second swing rod hang down to the side of the substrate.

6. The mechanical extension device of the rocking seat according to claim 5, characterized in that: The guide groove and locking groove are formed on the substrate, and are located between the first connecting part and the second connecting part and in the middle of the substrate; the locking member is located at the upper end of the second connecting rod. When switching from a sitting position to a lying position, the second connecting rod rotates forward, and the locking member passes over the second connecting part and enters the guide groove.

7. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The second link is also rotatably connected to a seat link and a backrest link. One end of the backrest link is rotatably connected to the second link, and the other end of the backrest link is rotatably connected to the lower end of the backrest connector. The lower end of the seat link is rotatably connected to the second link, and the upper end of the seat link is fixedly connected to the seat connector. When the second link rotates forward, the backrest link causes the backrest connector to tilt backward relative to the seat connector, and the seat link causes the seat connector to descend. The upper end of the first link is fixedly connected to the front of the seat connector, and the seat link is fixedly connected to the rear of the seat connector. When the first link and the seat link are configured to switch from a sitting position to a reclining position, the first link keeps the front of the seat connector at a constant height, and the seat link causes the rear of the seat connector to sink.

8. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The actuator is connected to the mechanical extension unit through the first drive tube and the second drive tube. The first drive tube is connected to the foot rest linkage assembly, and the second drive tube is connected to the seat linkage.

9. The mechanical extension device of the rocking seat according to claim 8, characterized in that: The footrest linkage assembly includes a first footrest linkage, a second footrest linkage, a third footrest linkage, and a fourth footrest linkage. The upper ends of the first and second footrest linkages are rotatably connected to the seat connector. The connection point between the first footrest linkage and the seat connector is located behind the connection point between the second footrest linkage and the seat connector. The lower end of the first footrest linkage is rotatably connected to one end of the third footrest linkage, and the other end of the third footrest linkage is rotatably connected to the footrest connector. The lower end of the second footrest linkage is rotatably connected to one end of the fourth footrest linkage, and the other end of the fourth footrest linkage is rotatably connected to the footrest connector. The lower part of the second footrest linkage is also rotatably connected to the third footrest linkage. The middle part of the first footrest linkage is rotatably connected to the linkage rod. The first drive tube is fixedly connected to the second footrest linkage of the footrest linkage assembly.

10. The mechanical extension device of the rocking seat according to claim 1, characterized in that: The base includes a rotating base and a base plate. The rotating base includes a rotating seat and a fixed seat. The rotating seat is rotatably mounted on the fixed seat, and the base plate is fixedly mounted on the rotating seat. The first swing rod and the second swing rod are rotatably connected to the base plate. The mechanical extension unit is rotatably connected to the first swing rod and the second swing rod. The rotating seat is configured to drive the mechanical extension unit to rotate synchronously when the rotating seat rotates. A plurality of balls are provided between the rotating seat and the fixed seat. Ball grooves are opened on the opposing surfaces of the rotating seat and the fixed seat. The balls are located in the ball grooves, and the rotating seat rotates relative to the fixed seat through the balls.

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