Mechanical extension device for rocking seats and rocking seats

Abstract

This utility model relates to a mechanical extension device for a rocking seat, comprising: a base unit; a rocker arm disposed above the base unit; a side plate fixedly connected to the rocker arm, wherein the side plate is rocking relative to the base unit by means of the rocker arm; a backrest bracket connected to the rear of the side plate, wherein the backrest bracket is for attaching the back of the rocking seat; a leg extension unit connected to the front of the side plate; a backrest electro-actuator designed to cause the backrest bracket to tilt backward and return forward relative to the side plate; a leg electro-actuator designed to cause the leg extension unit to extend forward and retract backward relative to the side plate; and a locking unit configured to limit the rocking of the side plate relative to the base unit by the backward tilting of the backrest bracket and / or the forward extension of the leg extension unit. This utility model also relates to a rocking seat.

Description

Technical Field

[0001] This utility model relates to a mechanical extension device for a rocking seat and a rocking seat. Background Technology

[0002] Movable seating, such as rocking chairs, is becoming increasingly popular. As users demand greater comfort and safety, rocking chairs are equipped with more and more features and safety measures. For example, some rocking chairs can switch between sitting, TV, and reclining positions. However, known rocking chairs often use a single actuator. This limits the user's flexibility in adjusting the backrest or leg support posture. Furthermore, excessive rocking can pose a risk of tipping over. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a seat unit with a simpler structure, easier operation and higher safety.

[0004] To solve the above-mentioned technical problems, this utility model provides a mechanical extension device for a rocking seat, comprising: a base unit; a rocker arm disposed above the base unit; a side plate fixedly connected to the rocker arm, wherein the side plate is rocking relative to the base unit by means of the rocker arm; a backrest bracket connected to the rear of the side plate, wherein the backrest bracket is used to attach the back of the rocking seat; a leg extension unit connected to the front of the side plate; a backrest electro-actuator designed to cause the backrest bracket to tilt backward and return forward relative to the side plate; a leg electro-actuator designed to cause the leg extension unit to extend forward and retract backward relative to the side plate; and a locking unit configured to move closer to the base unit by the backward tilting of the backrest bracket and / or the forward extension of the leg extension unit, thereby restricting the rocking of the side plate relative to the base unit.

[0005] According to this invention, the backrest support and leg extension unit are actuated by different electro-actuated devices. This allows the user to flexibly adjust the movement of the backrest and footrest as needed. Furthermore, the locking unit enhances safety. Especially when the backrest support tilts backward or the leg extension unit extends forward, the center of gravity of the rocking chair and the seated user shifts. In this situation, the locking unit can move closer to the base unit, thereby limiting the rocking of the side panels relative to the base unit, and, if necessary, contacting the base unit to firmly prevent the rocker arm from rocking in the corresponding direction.

[0006] According to a preferred embodiment, the locking unit includes a first locking device that moves relative to the side panel under the drive of the backrest electro-actuator.

[0007] According to a preferred embodiment, the first locking device includes a first stop bar fixedly connected to the backrest bracket, wherein the free end of the first stop bar approaches the base unit by means of the rearward tilt of the backrest bracket relative to the side plate.

[0008] According to a preferred embodiment, the free end of the first stop bar abuts against the base unit by tilting the backrest bracket backward relative to the side plate.

[0009] According to a preferred embodiment, the first locking device further includes a first bushing disposed on the free end of the first stop bar.

[0010] In this embodiment, the first locking device prevents the backrest support from tilting further backward and prevents the side panel, together with the backrest support and the leg extension unit, from rocking backward as a whole.

[0011] According to a preferred embodiment, the backrest support is hinged to the side plate at a first pivot point, wherein the free end of the first stop bar is located below and behind the first pivot point.

[0012] The free end of the first stop bar is located below and behind the first pivot point. Therefore, when the backrest support tilts backward, the free end of the first stop bar generates a forward and downward arc-shaped movement trajectory. Thus, during the backward tilting process, the free end of the first stop bar gradually approaches the base unit, and when the backrest support tilts backward to a predetermined limit, the free end of the first stop bar abuts against the base unit.

[0013] According to a preferred embodiment, the locking unit includes a second locking device that moves relative to the side plate under the drive of the leg electro-actuation device.

[0014] According to a preferred embodiment, the second locking device includes a second stop bar and a locking linkage bar, wherein a first end of the second stop bar is pivotally connected to the side plate and a second end protrudes freely, a front end of the locking linkage bar is pivotally connected to the leg extension unit, and a rear end of the locking linkage bar is pivotally connected between the first end and the second end of the second stop bar, wherein the second end of the second stop bar approaches the base unit as the leg extension unit extends forward relative to the side plate.

[0015] According to a preferred embodiment, the second end of the second stop bar abuts against the base unit by the forward movement of the leg link relative to the side plate.

[0016] According to a preferred embodiment, the leg extension unit includes at least one leg link, the front end of which is connected to the leg link, wherein the leg link moves forward or backward when the leg extension unit extends forward or retracts backward.

[0017] According to a preferred embodiment, the second locking device further includes a second bushing disposed on the second end of the second stop bar.

[0018] In this embodiment, the second locking device prevents the leg extension unit from extending further forward and prevents the side panel, along with the backrest support and the leg extension unit as a whole, from rocking backward.

[0019] According to a preferred embodiment, the second stop bar is constructed as a V-arm, wherein the rear end of the locking linkage is pivotally connected to the corner of the V-arm.

[0020] According to a preferred embodiment, the opening direction of the V-arm is rearward.

[0021] According to a preferred embodiment, the second end of the second stop bar is located below and behind the first end.

[0022] In this embodiment, the second end of the second stop bar is positioned as a free end below and behind the first end. Therefore, when the leg extension unit extends forward, the locking linkage causes the second stop bar to pivot around its first end, resulting in a forward and downward arc-shaped motion trajectory at its second end. Thus, during the forward extension of the leg extension unit, the second end of the second stop bar gradually approaches the base unit, and when the leg extension unit extends forward to a predetermined limit, the second end of the second stop bar abuts against the base unit.

[0023] According to a preferred embodiment, the backrest support is pivotally connected to the side plate at a first pivot point, wherein the side plate includes a guide groove, and the backrest support includes a guide pin adjacent to the first pivot point, wherein the guide pin is movably fitted into the guide groove.

[0024] According to a preferred embodiment, the guide pin can abut against at least one end of the guide groove to limit the pivot angle of the backrest bracket relative to the side plate.

[0025] According to a preferred embodiment, one end of the backrest electric actuator is fixedly connected to the side plate, and the other end is connected to the backrest bracket.

[0026] According to a preferred embodiment, one end of the leg electro-actuation device is fixedly connected to the side plate, and the other end is connected to the leg extension unit.

[0027] According to a preferred embodiment, the backrest electro-actuator and the leg electro-actuator are connected to a motor crossbeam fixedly connected to the side panel.

[0028] According to a preferred embodiment, the rocker arm includes an upper surface fixedly connected to a side plate and an arc-shaped convex lower surface, wherein the lower surface contacts the base unit.

[0029] This utility model also provides a rocking seat, which includes the above-mentioned mechanical extension device, a seat portion attached to the side panel, a backrest attached to the backrest bracket, and a footstool attached to the leg extension unit.

[0030] The advantages described above for the mechanical extension device also apply to rocking seats with such a mechanical extension device. Attached Figure Description

[0031] The embodiments of this utility model are described in detail below with the aid of the accompanying drawings.

[0032] Figure 1 A perspective view is shown of one embodiment of a mechanical extension device for a rocking seat according to the present invention, in a seated position.

[0033] Figure 2 Show Figure 1 A three-dimensional view of the mechanical extension device from another angle, in its initial position;

[0034] Figure 3 Show Figure 2 The diagram shows a three-dimensional view of the mechanical extension device in its fully extended position.

[0035] Figure 4 Show Figure 2 A partial enlarged view of the mechanical extension device shown;

[0036] Figure 5 Show Figure 3 A partial enlarged view of the mechanical extension device shown;

[0037] Figure 6 A partial side view of the mechanical extension device according to the present invention is shown, wherein the backrest unit is not tilted backward relative to the side panel;

[0038] Figure 7 A partial side view of the mechanical extension device according to the present invention is shown, wherein the backrest unit is tilted rearward relative to the side plate;

[0039] Figure 8 A perspective view of another embodiment of the mechanical extension device according to the present invention is shown, in a seated position.

[0040] Figure 9Show Figure 8 A three-dimensional view of the mechanical extension device from another angle, in its initial position;

[0041] Figure 10 Show Figure 9 The diagram shows a three-dimensional view of the mechanical extension device in its fully extended position.

[0042] Figure 11 A partial side view of the mechanical extension device according to the present invention is shown, wherein the leg extension unit extends forward relative to the side plate; and

[0043] Figure 12 A partial side view of the mechanical extension device according to the present invention is shown, wherein the backrest unit is retracted rearward relative to the side panel. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] The term "one embodiment" or "implementation" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0046] Furthermore, it should be noted that the terms "front-back direction" and "front-back" in this application refer to the extension direction of the leg extension unit of the seat unit or mechanical extension device. Specifically, "front" refers to the direction towards the leg extension unit, and "rear" refers to the direction towards the backrest. The terms "left-right direction" and "left-right" refer to the direction of the left and right hands of the user when sitting down in the seat unit or mechanical extension device.

[0047] The mechanical extension device according to this utility model is applicable to rocking seats. The mechanical extension device 100 includes a base unit 10, a rocking unit 20, a side plate 30, a backrest unit 40, a leg extension unit 50, and an actuation unit 60, wherein the actuation unit 60 includes a backrest electric actuation device 61 and a leg electric actuation device 62 for adjusting the backrest unit 40 and the leg extension unit 50, respectively.

[0048] The base unit 10 may include at least the following: Figures 1 to 3 The two parallel base beams 11 shown extend generally along the front-rear direction of the seat unit. The mechanical extension device 100 is securely supported on the ground by means of the base unit 10.

[0049] The rocking unit 20 may include, for example, Figures 1 to 3 The rocker arm 21 is shown. The rocker arm 21 includes a flat upper surface and an arc-shaped, convex lower surface. The upper surface is fixedly connected to the side plate 30, while the lower surface is swayably supported on the base longitudinal beam 11 of the base unit 10. The rocking mechanism 20 may also include an L-shaped rocking mounting plate 22, whose vertically upward section is fixedly connected to the side plate 30, and whose horizontally extending section is fixedly connected to the upper surface of the rocker arm 21. Of course, in embodiments not shown, the side plate 30 may also be fixedly connected to the rocker arm 21 by means of multiple angle irons or rivets.

[0050] The rocking unit 20 may also include, for example, Figure 4 The spring assembly 23 shown may include one or more springs. The spring assembly 23 is arranged adjacent to and connected to the rocker arm 21, thereby providing cushioning and resetting functions when the rocker arm 21, together with the side plate 30, rocks back and forth relative to the base unit 10.

[0051] Especially Figure 4 As shown, the side panel 30 may include a first side panel segment 31, a second side panel segment 32, and a third side panel segment 33 rigidly connected to each other. The first side panel segment 31 may be V-shaped and designed for attaching the seat portion of a rocking seat. The second side panel segment 32 is fixedly connected to the rear half of the first side panel segment 31. Figure 4As shown, the second side plate segment 32 includes a rearwardly extending extension with a guide groove 321. The third side plate segment 33 includes two upwardly curved ends and a middle section extending between these two ends. The two ends of the third side plate segment 33 are fixedly connected to the front end of the first side plate segment 31 and the rear end of the second side plate segment 32, respectively, while the middle section of the third side plate segment 33 is fixedly connected to the rocker mounting plate 22 of the rocker unit 20. Thus, the side plate 30 is rigidly connected to the rocker arm 21 as a single unit.

[0052] In this embodiment, the first side plate segment 31, the second side plate segment 32, and the third side plate segment 33 are connected to each other by means of welding, riveting, threaded connection, etc. Of course, in an embodiment not shown, the side plate 30 can also be integrally constructed by casting.

[0053] The backrest unit 40 includes a backrest support 41. In this embodiment, the backrest support 41 includes a forward-protruding first section and an upward-extending second section. The backrest support 41 is pivotally connected to the rear of the side panel 30 at a first pivot point P1 via its first section, and the backrest support 41 is fixedly connected to the backrest of a rocking seat (not shown) via its second section. The backrest support 41 also includes a guide pin 411 located on its first section. The guide pin 411 is rearwardly offset relative to the first pivot point P1 and movably engaged in a guide groove 321 of the second side panel section 32 of the side panel 30. The engagement of the guide groove 321 and the guide pin 411 restricts the pivot angle of the backrest support 41 relative to the side panel 30 about the first pivot point P1. For example, in Figure 4 In the indicated state, the backrest bracket 41 is not yet tilted backward relative to the side plate 30, and the guide pin 411 is located at the upper end of the guide groove 321; Figure 5 In the state shown, the backrest bracket 41 pivots clockwise around the first pivot point P1, and the guide pin 411 abuts against the lower end of the guide groove 321. As a result, the backrest bracket 41 cannot continue to pivot clockwise around the first pivot point P1, thereby limiting the degree to which the backrest bracket 41 tilts backward.

[0054] A backrest crossbeam 43 extends laterally between two backrest supports 41 and is fixedly connected to the backrest supports 41 at both ends. In this embodiment, as... Figure 4 , Figure 5 As shown, the backrest crossbeam 43 is fixedly connected to the backrest bracket 41 at both ends by means of backrest connecting pieces 42. The backrest connecting pieces 42 can be fixedly connected to the backrest bracket 41 by means of riveting, threaded connection, welding, etc. In an embodiment not shown, the backrest bracket 41 can also be integrally constructed with the backrest connecting pieces 42 by casting.

[0055] The leg extension unit 50 is pivotally connected to the front of the side plate 30 and is capable of extending forward and retracting backward relative to the side plate 30, thereby causing the footstool to move forward and return to its original position relative to the side plate 30. The leg extension unit 50 includes at least one leg link that is capable of moving forward or backward under the drive of the leg electro-actuator 62.

[0056] According to this utility model, the leg extension unit 50 can be constructed in a variety of ways.

[0057] For example, in one implementation, such as Figure 9 and Figure 10 As shown, the leg extension unit 50 may include a multi-link mechanism. This multi-link mechanism includes a first leg link 51, a second leg link 52, a third leg link 53, a fourth leg link 54, and a footrest 55. The rear ends of the first leg link 51 and the second leg link 52 are pivotally connected to the front of the side plate 30, respectively, wherein the hinge point between the first leg link 51 and the side plate 30 is further rearward than the hinge point between the second leg link 50 and the side plate 30. The rear end of the third leg link 53 is hinged to the front end of the first leg link 51, and the rear end of the fourth leg link 54 is hinged to the front end of the second leg link 52. The front ends of the third leg link 53 and the fourth leg link 54 are respectively hinged to the footrest 55. The footrest 55 is used to attach a footstool (not shown) to a rocking chair. With the help of the leg extension unit 50 extending forward and retracting backward relative to the side plate 30, the footstool correspondingly rises forward and returns to its original position relative to the side plate 30.

[0058] The leg extension unit 50 also includes a laterally extending leg beam 56. The leg beam 56 is connected at its ends to multi-link mechanisms on the left and right sides. In this embodiment, the leg beam 56 is connected to a second leg link 52. However, in an embodiment not shown, the leg beam 56 may also be connected to other components of the multi-link mechanism, such as between the second leg link 52, the third leg link 53, or the fourth leg link 54.

[0059] Alternatively, in an embodiment not shown, the leg extension unit 50 may also include only one leg link and a footrest 55, wherein the front end of the leg link is hinged to the footrest 55, and the rear end of the leg link is pivotally connected to the front of the side plate 30. A leg crossbeam 56 is correspondingly connected between the left and right leg links. By means of the forward and backward movement of the leg link relative to the side plate 30, the footrest is correspondingly raised forward and lowered backward relative to the side plate 30.

[0060] The backrest electro-actuator 61 includes a backrest motor 611 and a backrest actuation rod 612 retractable relative to the backrest motor 611. The leg electro-actuator 62 includes a leg motor 621 and a leg actuation rod 622 retractable relative to the leg motor 621. One end of the backrest electro-actuator 61 is connected to the backrest crossbeam 43, and the other end is connected to the side panel 30; one end of the leg electro-actuator 62 is connected to the leg crossbeam 56, and the other end is also connected to the side panel 30. For example, in this embodiment, the backrest electro-actuator 61 is connected to the backrest crossbeam 43 via its backrest actuation rod 612, the backrest motor 611 is connected to the motor crossbeam 34, the leg electro-actuator 62 is connected to the leg crossbeam 56 via its leg motor 621, and the leg actuation rod 622 is connected to the motor crossbeam 34, wherein the motor crossbeam 34 is laterally connected and its two ends are fixedly connected to the second side panel section 32 of the side panel 30.

[0061] Actuation of the backrest electro-actuator 61 causes the backrest crossbeam 43 to move away from or closer to the motor crossbeam 34, thereby causing the backrest support 41 to tilt backward or return to its original position relative to the side panel 30. Actuation of the leg electro-actuator 62 causes the leg crossbeam 56 to move away from or closer to the motor crossbeam 34, thereby causing the leg extension unit 50 to extend forward or retract backward relative to the side panel 30.

[0062] The backrest electric actuator 61 and the leg electric actuator 62 can be actuated independently of each other, thereby allowing the user to adjust the backrest unit and the leg extension unit independently as needed.

[0063] To enhance the safety of the rocking seat, the mechanical extension device also includes a locking unit 70.

[0064] The locking unit 70 is configured to contact the base unit 10 by the rearward tilting of the backrest bracket 41 and / or the forward extension of the leg extension unit 50, thereby limiting the rocking of the side plate 30 relative to the base unit 10.

[0065] Locking unit 70 may include Figures 1 to 7 The first locking device 71 is shown. Alternatively or as a supplement, the locking unit 70 may further include... Figures 8 to 12 The second locking device 72 shown.

[0066] The first locking device 71 is movable relative to the side panel 30 under the drive of the backrest electric actuator 61. The first locking device 71 includes a first stop bar 711, wherein the first stop bar 711 is fixedly connected to the backrest bracket 41. Specifically, as... Figure 4 and Figure 5The first stop bar 711 is constructed as a downward extension of the backrest tab 42, thereby fixing the first stop bar 711 to the backrest bracket 41. However, in an embodiment not shown, the first stop bar 711 may also be integrally constructed with the backrest bracket 41 and the backrest tab 42. The free end of the first stop bar 711 protrudes downward and includes a first bushing 712.

[0067] The first line L1 connecting the free end of the first stop lever 711 and the first pivot point P1 is inclined relative to the vertical direction, wherein the free end of the first stop lever 711 is located below and behind the first pivot point P1. When the backrest electric actuator 61 causes the backrest support 41 to tilt backward, the free end of the first stop lever 711 moves forward and downward along an arc trajectory centered on the first pivot point P1. During this process, the free end of the first stop lever 711 approaches the base unit 10 and eventually contacts the base unit 10.

[0068] like Figure 6 As shown, when the backrest support 41 is not tilted backward relative to the side panel 30, the free end of the first stop bar 711 maintains a distance relative to the base unit 10. In this case, the side panel 30 together with the backrest unit 40 can be rocked back and forth relative to the base unit 10 by means of the rocking unit 20. Figure 7 As shown, when the backrest electric actuator 61 causes the backrest support 41 to tilt backward clockwise around the first pivot point P1, the first stop bar 711 moves downward and forward clockwise along with the backrest support 41, thereby approaching the base unit 10 and eventually contacting the base unit 10. Thus, the contact between the first stop bar 711 and the base unit 10 prevents the backrest support 41 from tilting further backward and prevents the side plate 30 from rocking backward relative to the base unit 10.

[0069] The second locking device 72 is movable relative to the side plate 30 under the drive of the leg electro-actuator 62. The second locking device 72 includes a second stop bar 721 and a locking linkage 723. The first end of the second stop bar 721 is hinged to the side plate 30 at a second pivot point P2, and the second end protrudes freely. The second stop bar 721 may also include a second bushing 722 disposed on its free end, i.e., its second end. The front end of the locking linkage 723 is pivotally connected to a leg link of the leg extension unit 50, for example, pivotally connected to the first leg link 51, and the rear end of the locking linkage 723 is pivotally connected between the first and second ends of the second stop bar 721. In this embodiment, the second stop bar 721 is configured as a rearward-opening V-arm, wherein the rear end of the locking linkage 723 is pivotally connected to the corner of the V-arm. Alternatively, in an embodiment not shown, the second stop bar 721 may also extend in a generally straight line.

[0070] The second line L2 connecting the first and second ends of the second stop lever 721 is inclined relative to the vertical direction, wherein the second end of the second stop lever 721 is located below and behind the first end. When the leg electro-actuator 62 causes the leg extension unit 50 to extend forward, the locking linkage 723 moves forward under the action of the leg linkage connected thereto, such as the first leg linkage 51, and causes the second end of the second stop lever 721 to move forward and downward along an arc trajectory centered on the second pivot point P2. During this process, the second end of the second stop lever 721 approaches the base unit 10 and eventually contacts the base unit 10.

[0071] like Figure 11 As shown, when the leg extension unit 50 is not extended forward relative to the side panel 30, that is, when the leg extension unit 50 is retracted relative to the side panel 30, the second end of the second stop bar 721 maintains a distance relative to the base unit 10. In this case, the side panel 30 together with the backrest unit 40 can be rocked back and forth relative to the base unit 10 by means of the rocking unit 20. When the leg electro-actuator 62 causes the leg extension unit 50 to extend forward, the second end of the second stop bar 721 moves forward and downward in a clockwise direction, thereby approaching the base unit 10 and eventually contacting the base unit 10, as shown. Figure 12 As shown. Thus, by abutting against the base unit 10, the second stop bar 721 prevents the leg extension unit 50 from extending further forward and prevents the side plate 30 from rocking backward relative to the base unit 10.

[0072] Here, the locking unit 70 may include only one of the first locking device 71 and the second locking device 72, or it may include both the first locking device 71 and the second locking device 72.

[0073] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A mechanical extension device for a rocking seat, comprising: Base unit; A rocker arm positioned above the base unit; A side plate fixedly connected to the rocker arm, wherein the side plate is swayable relative to the base unit by means of the rocker arm; A backrest bracket connected to the rear of the side panel, wherein the backrest bracket is used to attach the backrest of a rocking seat; A leg extension unit connected to the front of the side plate; A backrest electro-actuator designed to cause the backrest support to tilt backward and return to its original position relative to the side panel; A leg electro-actuating device, the leg electro-actuating device being designed to cause the leg extension unit to extend forward and retract backward relative to the side plate; and A locking unit is configured to move toward the base unit by tilting the backrest support backward and / or extending the leg extension unit forward, thereby limiting the rocking of the side panel relative to the base unit.

2. The mechanical extension device according to claim 1, characterized in that, The locking unit includes a first locking device that moves relative to the side panel under the drive of the backrest electro-actuator.

3. The mechanical extension device according to claim 2, characterized in that, The first locking device includes a first stop bar fixedly connected to the backrest bracket, wherein the free end of the first stop bar approaches the base unit by means of the rearward tilt of the backrest bracket relative to the side plate.

4. The mechanical extension device according to claim 3, characterized in that, By tilting the backrest bracket backward relative to the side plate, the free end of the first stop bar abuts against the base unit.

5. The mechanical extension device according to claim 3, characterized in that, The first locking device further includes a first bushing disposed on the free end of the first stop bar.

6. The mechanical extension device according to claim 3, characterized in that, The backrest support is hinged to the side plate at the first pivot point, wherein the free end of the first stop bar is located below and behind the first pivot point.

7. The mechanical extension device according to claim 1, characterized in that, The locking unit includes a second locking device that moves relative to the side plate under the drive of the leg electro-actuator.

8. The mechanical extension device according to claim 7, characterized in that, The second locking device includes a second stop bar and a locking linkage rod, wherein a first end of the second stop bar is pivotally connected to the side plate and a second end protrudes freely, a front end of the locking linkage rod is pivotally connected to the leg extension unit, and a rear end of the locking linkage rod is pivotally connected between the first end and the second end of the second stop bar, wherein the second end of the second stop bar approaches the base unit as the leg extension unit extends forward relative to the side plate.

9. The mechanical extension device according to claim 8, characterized in that, As the leg link moves forward relative to the side plate, the second end of the second stop bar abuts against the base unit.

10. The mechanical extension device according to claim 8, characterized in that, The leg extension unit includes at least one leg link, and the front end of the locking linkage is connected to the leg link, wherein the leg link moves forward or backward when the leg extension unit extends forward or retracts backward.

11. The mechanical extension device according to claim 8, characterized in that, The second locking device further includes a second bushing disposed on the second end of the second stop bar.

12. The mechanical extension device according to claim 8, characterized in that, The second stop bar is constructed as a V-shaped arm, wherein the rear end of the locking linkage is pivotally connected to the corner of the V-shaped arm.

13. The mechanical extension device according to claim 12, characterized in that, The opening of the V-shaped arm faces backward.

14. The mechanical extension device according to claim 8, characterized in that, The second end of the second stop bar is located below and behind the first end.

15. The mechanical extension device according to claim 6, characterized in that, The side panel includes a guide groove, and the backrest bracket includes a guide pin adjacent to the first pivot point, wherein the guide pin is movably fitted into the guide groove.

16. The mechanical extension device according to claim 15, characterized in that, The guide pin can abut against at least one end of the guide groove to limit the pivot angle of the backrest support relative to the side plate.

17. The mechanical extension device according to claim 1, characterized in that, One end of the backrest electric actuator is fixedly connected to the side plate, and the other end is connected to the backrest bracket.

18. The mechanical extension device according to claim 17, characterized in that, One end of the leg electro-actuator is fixedly connected to the side plate, and the other end is connected to the leg extension unit.

19. The mechanical extension device according to claim 18, characterized in that, The backrest electro-actuator and leg electro-actuator are connected to a motor crossbeam that is fixedly connected to the side panel.

20. The mechanical extension device according to claim 1, characterized in that, The rocker arm includes an upper surface fixedly connected to the side plate and an arc-shaped convex lower surface, wherein the lower surface is in contact with the base unit.

21. A rocking seat comprising a mechanical extension device as described in any one of claims 1 to 20, a seat portion attached to the side panel, a backrest attached to the backrest support, and a footstool attached to the leg extension unit.

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