Extended leg structure for footrest and its seat mechanical extension device

Abstract

This application relates to an extended leg structure for the footrest and its mechanical extension device for the seat. The extended leg structure comprises leg link one, leg link two, leg link three, leg link four, a rear footrest, a front footrest, and a footrest control component. One end of leg link one and leg link two are respectively hinged to the front of the seat mounting plate. The other end of leg link one is hinged to one end of leg link three, the other end of leg link two is hinged to one end of leg link four, the other end of leg link four is hinged to the rear footrest, the rear footrest is hinged to leg link three, the rear footrest is hinged to the footrest control component, the front footrest is hinged to the footrest control component, the front footrest is hinged to the other end of leg link three, and leg link four is hinged to leg link one. The rear and front footrests are assembled into a combined footrest when the leg structure is extended. This application also includes a mechanical extension device for the seat with the above-mentioned leg structure. The footrest length of this application is relatively long, has a wider range of applications, and provides better comfort.

Description

Technical Field

[0001] This application relates to an electric seat frame and its components, particularly the design and application of a leg extension structure for a footrest and its seat mechanical extension device. Background Technology

[0002] See the patent document with application number CN201920005867.4 and patent name "footrest assembly and mechanical extension device for sofa chair". It has a defect: when the leg structure is extended in TV posture and reclining posture, the footrest connector is relatively short and low, making it difficult to accommodate users of various body types. This makes it difficult for some users who are shorter or taller to place their feet on it. Summary of the Invention

[0003] The first technical problem solved by this application is to overcome the aforementioned shortcomings of the prior art and provide a leg structure with a longer footrest length when the leg structure is extended, a wider range of applications, and better comfort. The second technical problem solved by this application is to overcome the aforementioned shortcomings of the prior art and provide a seat mechanical extension device with a longer footrest length when the leg structure is extended, a wider range of applications, and better comfort.

[0004] The technical solution adopted by this application to solve the first technical problem mentioned above includes: a leg support extended type leg structure, which is composed of leg link one, leg link two, leg link three, leg link four, a rear leg support piece, a front leg support piece, and a leg support control piece. One end of leg link one and leg link two are respectively hinged to the front of the seat mounting plate, the other end of leg link one is hinged to one end of leg link three, the other end of leg link two is hinged to one end of leg link four, and the other end of leg link four is hinged through the rear leg support piece. The rear footrest is hinged to the axle, and the rear footrest is hinged to the leg link three via the hinge axle of the rear footrest leg link three. The rear footrest is hinged to the foot control component via the hinge axle of the rear footrest footrest control component. The front footrest is hinged to the foot control component via the hinge axle of the front footrest foot control component. The front footrest is hinged to the other end of the leg link three via the hinge axle of the front footrest leg link three. The leg link four is hinged to the leg link one via the hinge axle of the first and fourth leg links. The rear and front footrests are assembled into a combined footrest in the extended leg structure state. This application, through the interconnection between the rear, front, and control components of the footrest and their positioning with other components of the leg structure, enables the rear and front footrests to be assembled into a combined footrest (extended footrest) in the extended leg structure state, increasing the total length of the footrest and expanding the applicability and comfort of the seat.

[0005] The fourth leg link of this application is provided with a leg structure limiter. When the leg structure is extended to its maximum state or retracted to a sitting position, the leg structure limiter contacts the first leg link to restrict the maximum extended position or the limit of the retracted state of the leg structure.

[0006] The total length of the combined footrest in this application is increased by 100 mm.

[0007] The technical solution adopted by this application to solve the second technical problem mentioned above includes: a seat mechanical extension device, including a drive device and a connecting component. The drive device is installed on a base and connected to the drive rod of the connecting component. The seat mechanical extension device includes two mechanical extension units arranged symmetrically on the left and right. The mechanical extension unit includes a leg structure and a frame component. The leg structure adopts the above-mentioned extended leg structure with a footrest. The extended leg structure with a footrest is installed on the frame component.

[0008] The structural components include a seat mounting plate, a front support, a rear support, a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a transmission rod, a backrest control component, a protective component, a backrest link, and a backrest component. The protective component is fixedly mounted on the seat mounting plate. The seat mounting plate is hinged to the first link via a hinge axis. The first link is hinged to the upper end of the front support via a hinge axis. The lower end of the front support is hinged to the front end of the base. The middle of the first link is hinged to the front end of the second link via a hinge axis. The rear end of the second link is hinged to the backrest control component via a hinge axis. The third link is hinged to the middle of the front support via a hinge axis. The third link is also hinged to the fifth link via a hinge axis. The shaft is hinged to the fifth link, which is hinged to the seat mounting plate via the fifth link hinge shaft. The front end of the fourth link is hinged to the second leg link of the leg structure via the second leg link hinge shaft, and the rear end of the fourth link is hinged to the fifth link via the fifth link hinge shaft. The front end of the sixth link is hinged to the second leg link via the second leg link hinge shaft. The rear end of the sixth link is hinged to the transmission rod via the sixth link transmission rod hinge shaft. The upper end of the transmission rod is rotatably mounted on the seat mounting plate. The backrest control component is hinged to the upper end of the rear support component via the backrest control component hinge shaft. The lower end of the rear support component is hinged to the rear end of the base. The backrest control component is hinged to the lower end of the protective component via the backrest control component protective component hinge shaft. The backrest control component is hinged to the backrest link via the backrest control component backrest link hinge shaft. When the backrest control component's backrest linkage hinge shaft moves forward relative to the backrest, it drives the backrest linkage's backrest hinge shaft to rotate downward around the seat mounting plate's backrest hinge shaft, thereby reducing the backrest's reclining angle. This application, by adjusting the first and second linkage hinge shafts forward and upward when in a reclining position, elevates the leg support structure relative to the prior art when in a reclining position. This increases the upward tilt of the seat mounting plate and the relative height difference between the highest point of the leg support structure and the highest point of the backrest, allowing the feet to be raised to approximately or slightly above the user's heart level. This facilitates blood flow back to the heart from the legs, expands the leg support structure's adjustment range, and improves the user experience.

[0009] The drive device is a slider motor, which is installed at both ends of the base. The slider of the drive device is hinged to the drive device connector, and the drive device connector is hinged to the drive rod in the connecting assembly. The drive rod is installed on the seat mounting plate.

[0010] When in a lying position, the height difference between the highest position of the leg structure and the highest position of the backrest is between 160 mm and 170 mm, and the reclining angle of the backrest is between 29 and 31°.

[0011] The drive device of this application can be stopped at any state between the final sitting position and the final lying position at any time by a switch. Users can adjust it arbitrarily without affecting users who do not like to raise their feet.

[0012] The backrest control component is provided with a backrest control component reset spring mounting pin, and a reset spring is installed between the backrest control component reset spring mounting pin and the seat mounting plate. The reset spring is used to assist the product in returning from a reclining position to a sitting position.

[0013] Compared with existing technologies, this application has the following advantages and effects: the footrest is longer, the applicable range is wider, and the comfort is better. When lying down, the footrest is positioned higher and tilted relatively backward, the backrest tilts at a greater angle, expanding the adjustment range, improving comfort, and enhancing reliability. Attached Figure Description

[0014] Figure 1 This is a side view of the connection between the leg structure in the folded-up state (sitting posture) and the seat mounting plate in an embodiment of this application.

[0015] Figure 2 This is a three-dimensional schematic diagram of the connection between the leg structure in the extended state (TV posture, reclining posture) and the seat mounting plate in an embodiment of this application.

[0016] Figure 3 This is a schematic diagram of the seat mechanical extension device of the embodiment of this application from the outside of the seat posture.

[0017] Figure 4 This is a schematic diagram of the TV posture of the seat mechanical extension device according to an embodiment of this application.

[0018] Figure 5 This is a schematic diagram of the reclining side of the seat mechanical extension device according to an embodiment of this application.

[0019] Figure 6 This is a three-dimensional schematic diagram of the reclining main structure of the seat mechanical extension device according to an embodiment of this application.

[0020] Figure 7 This is a schematic diagram of the reclining position of the seat mechanical extension device according to an embodiment of this application.

[0021] Reference numerals in the accompanying drawings for the embodiments:

[0022] 1 - Base; 2 - Leg structure; 21 - Leg link one; 211 - Leg link one and four hinge shaft; 22 - Leg link two; 23 - Leg link three; 24 - Leg link four; 241 - Leg structure limiter; 25 - Rear foot rest; 251 - Rear foot rest leg link four hinge shaft; 252 - Rear foot rest leg link three hinge shaft; 253 - Rear foot rest foot control component hinge shaft; 26 - Front foot rest; 261 - Front foot rest leg link three hinge shaft; 262 - Front foot rest foot control component hinge shaft; 27 - Footrest control; 3- Frame assembly; 31- First link; 316- First link / Second link hinge shaft; 32- Second link; 321- Second link / Backrest control hinge shaft; 33- Third link; 331- Third link / Fifth link hinge shaft; 34- Fourth link; 341- Fourth link / Fifth link hinge shaft; 342- Fourth link / Leg link / Second link hinge shaft; 35- Fifth link; 351- Seat mounting plate / Fifth link hinge shaft; 36- Sixth link; 361- Sixth link drive rod Hinge shaft; 362-Sixth link leg link second hinge shaft; 37-Transmission rod; 38-Backrest control component; 381-Backrest control component protective component hinge shaft; 382-Backrest control component backrest link hinge shaft; 383-Backrest control component return spring mounting pin; 39-Protective component; 310-Backrest link; 3101-Backrest link backrest component hinge shaft; 311-Backrest component; 3111-Seat mounting plate backrest component hinge shaft; 312-Seat mounting plate; 3121-Seat mounting plate first link hinge shaft; 313-Front support component; 3131-First link hinge shaft of the front support component; 3132-Third link hinge shaft of the front support component; 314-Rear support component; 3141-Backrest control hinge shaft of the rear support component; 315-Return spring; 4-Drive device; 41-Drive device slider; 42-Drive device connector; 5-Connecting assembly; 51-Drive rod; H-Height difference between the highest position of the leg structure and the highest position of the backrest component when lying down; L-Total length of the combined footrest; α-Angle between the backrest component and the bottom surface when lying down. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. These embodiments are illustrative of the present application, but the present application is not limited to them. The terms used in this application are relative to... Figure 3 In other words, Figure 3 Left is front, right is back; the relative changes (raising, moving forward, increasing, decreasing, etc.) described in this application are all relative to the prior art.

[0024] Example:

[0025] See Figures 1 to 7This application embodiment applies to a drive device 4 installed at both ends of a base 1. The drive device slider 41 translates between the front and rear ends of the base 1, causing the drive device connector 42 connected to it to drive the drive rod 51 to move accordingly, thereby driving the entire extended leg structure and its seat mechanical extension device to move accordingly. It mainly includes two mechanical extension units arranged symmetrically on the left and right and a connecting component 5. The drive device in the prior art (specifically a slider motor) is installed on the base 1 and hinged to the drive rod 51. The drive rod 51 is installed on the seat mounting plate 312 and drives the posture adjustment in this embodiment. Each mechanical extension unit mainly includes a leg structure 2 for leg extension and retraction and a frame component 7 for seat posture adjustment. Compared with the prior art, the main improvement of this application is in the design of the leg structure 2. The leg structure 2 is composed of leg connecting rod 1 21, leg connecting rod 22, leg connecting rod 33, leg connecting rod 44, rear footrest component 25, front footrest component 26, and footrest control component 27. One end of leg connecting rod 1 21 and leg connecting rod 22 are respectively hinged to the base 1. At the front of the seat mounting plate 312, one end of leg link 1 21 is hinged to one end of leg link 3, and the other end of leg link 22 is hinged to one end of leg link 4 24. The other end of leg link 4 24 is hinged to the footrest rear piece 25 via the footrest rear piece leg link 4 hinge shaft 251. The footrest rear piece 25 is hinged to leg link 3 23 via the footrest rear piece leg link 3 hinge shaft 252. The footrest rear piece 25 is hinged to the footrest control piece 27 via the footrest rear piece footrest control piece hinge shaft 253. The footrest front piece 26 is connected to the footrest front piece footrest. The control component hinge shaft 262 is hinged to the footrest control component 27. The front footrest component 26 is hinged to the other end of the leg link 23 via the front footrest leg link 3 hinge shaft 261. The fourth leg link 24 is hinged to the first leg link 21 via the first leg link 4 hinge shaft 211. The fourth leg link 24 is provided with a leg structure limiter 241. When the leg structure 2 is extended to its maximum state or folded into a sitting position, the leg structure limiter 241 engages with the first leg link 21 to limit the maximum extended position or the limit of the folded state of the leg structure 2. This application, through the interconnection between the rear footrest component 25, the front footrest component 26, and the footrest control component 27, and the connection and positioning relationship with the other components of the leg structure, allows the rear footrest component 25 and the front footrest component 26 to be spliced ​​into a combined footrest (extended footrest) in the extended state of the leg structure 2, increasing the total length of the footrest and expanding the applicability and comfort of the seat.

[0026] The total length of the combined support L in this application is 100 mm longer than that of the support connector in the prior art (100 mm larger).

[0027] The structural component 3 includes a seat mounting plate 312, a front support 313, a rear support 314, a first connecting rod 31, a second connecting rod 32, a third connecting rod 33, a fourth connecting rod 34, a fifth connecting rod 35, a sixth connecting rod 36, a transmission rod 37, a backrest control component 38, a protective component 39, a backrest connecting rod 310, and a backrest component 311. The protective component 39 is fixedly mounted on the seat mounting plate 312. The seat mounting plate 312 is hinged to the first connecting rod 31 via a first connecting rod hinge shaft 3121. The first connecting rod 31 is connected to the first connecting rod hinge shaft 3131 of the front support component. The upper end of the front support member 313 is hinged to the front end of the base 1, and the lower end of the front support member 313 is hinged to the front end of the base 1. The middle part of the first link 31 is hinged to the front end of the second link 32 through the first link-second link hinge shaft 316, and the rear end of the second link 32 is hinged to the backrest control member 38 through the second link backrest control member hinge shaft 321. The third link 33 is hinged to the middle part of the front support member 313 through the third link hinge shaft 3132 of the front support member, and the third link 33 is hinged to the fifth link 35 through the third link-fifth link hinge shaft 331. The fifth link 35 is hinged to the fifth link hinge shaft of the seat mounting plate. 351 is hinged to seat mounting plate 312. The front end of the fourth link 34 is hinged to leg link 22 of leg structure 2 via hinge shaft 342 of the second leg link of the fourth link. The rear end of the fourth link 34 is hinged to the fifth link 35 via hinge shaft 341 of the fifth link of the fourth link. The front end of the sixth link 36 is hinged to leg link 22 via hinge shaft 362 of the second leg link of the sixth link. The rear end of the sixth link 36 is hinged to transmission rod 37 via hinge shaft 361 of the sixth transmission rod. The upper end of transmission rod 37 is rotatably mounted on seat mounting plate 312. Backrest control component 38 is connected to the rear support component. The backrest control hinge shaft 3141 is hinged to the upper end of the rear support 314, and the lower end of the rear support 314 is hinged to the rear end of the base 1. The backrest control component 38 is hinged to the lower end of the protective component 39 through the backrest control component protective component hinge shaft 381. The backrest control component 38 is hinged to the backrest connecting rod 310 through the backrest control component backrest connecting rod hinge shaft 382. When the position of the backrest control component backrest connecting rod hinge shaft 382 moves forward, it drives the backrest connecting rod backrest component hinge shaft 3101 to rotate downward around the seat mounting plate backrest component hinge shaft 3111, thereby making the reclining angle α of the backrest component 311 smaller. This application adjusts the height of the first and second linkage hinge shaft 316 when the user is in a reclining position, thereby raising the combined leg rest structure relative to the prior art. This increases the upward tilt of the seat mounting plate 312 and increases the height difference H between the highest position of the leg structure and the highest position of the backrest. As a result, the user's feet can be raised to approximately or slightly above the height of their heart, which helps blood flow back to the heart from the legs. This also expands the adjustment range of the leg structure and improves the user experience.

[0028] As an exception, when in a reclining position, the height difference H between the highest position of the leg structure and the highest position of the backrest is between 160-170mm, and the reclining angle α of the backrest 311 is between 29-31°.

[0029] The drive device of this application can be stopped at any state between the final sitting position and the final lying position at any time by a switch. Users can adjust it arbitrarily without affecting users who do not like to raise their feet.

[0030] As a special case, in this embodiment of the application, the backrest control component 38 is provided with a backrest control component reset spring mounting pin 383, and a reset spring 315 is installed between the backrest control component reset spring mounting pin 383 and the seat mounting plate 312. The reset spring 315 is used to assist in returning from a lying position to a sitting position in this embodiment of the application.

[0031] All parts not described in this application are prior art. The process of changing from a sitting to a reclining position and the resetting process of the extended leg structure and its seat mechanical extension device are the same as those in the prior art, and will not be described in detail here. Any simple modifications or combinations of the technical features and solutions of this application shall be considered to fall within the protection scope of this application.

Claims

1. A leg structure with extended footrest, characterized in that: The extended leg structure consists of leg link one, leg link two, leg link three, leg link four, a rear footrest, a front footrest, and a footrest control component. One end of leg link one and leg link two are hinged to the front of the seat mounting plate. The other end of leg link one is hinged to one end of leg link three, and the other end of leg link two is hinged to one end of leg link four. The other end of leg link four is hinged to the rear footrest via a hinge shaft. The rear footrest is connected via a hinge shaft. The leg connecting rod three hinges to the leg connecting rod three. The rear foot rest is hinged to the foot control component via the rear foot rest control component hinge. The front foot rest is hinged to the foot control component via the front foot rest control component hinge. The front foot rest is hinged to the other end of the leg connecting rod three via the front foot rest leg connecting rod three hinge. The fourth leg connecting rod is hinged to the first leg connecting rod via the first leg connecting rod four hinge. The rear foot rest and the front foot rest are spliced ​​together to form a combined foot rest in the unfolded state of the leg structure.

2. The extended leg structure according to claim 1, characterized in that: The fourth leg link is equipped with a leg structure limiter. When the leg structure is extended to its maximum state or retracted to a sitting position, the leg structure limiter contacts the first leg link.

3. The extended leg structure according to claim 2, characterized in that: The total length of the combined footrest has been increased by 100 mm.

4. A seat mechanical extension device, comprising a drive unit and a connecting assembly, wherein the drive unit is mounted on a base and connected to a drive rod of the connecting assembly, characterized in that: The seat mechanical extension device includes two mechanical extension units arranged symmetrically on the left and right sides. Each mechanical extension unit includes a leg structure and a frame assembly. The leg structure adopts the extended leg structure with footrest as described in any one of claims 1 to 3. The extended leg structure with footrest is mounted on the frame assembly.

5. The seat mechanical extension device according to claim 4, characterized in that: The structural components include a seat mounting plate, a front support, a rear support, a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a transmission rod, a backrest control component, a protective component, a backrest link, and a backrest component. The protective component is fixedly mounted on the seat mounting plate. The seat mounting plate is hinged to the first link via a hinge axis. The first link is hinged to the upper end of the front support via a hinge axis. The lower end of the front support is hinged to the front end of the base. The middle of the first link is hinged to the front end of the second link via a hinge axis. The rear end of the second link is hinged to the backrest control component via a hinge axis. The third link is hinged to the middle of the front support via a hinge axis. The third link is also hinged to the fifth link via a hinge axis. The shaft is hinged to the fifth link, which is hinged to the seat mounting plate via the fifth link hinge shaft. The front end of the fourth link is hinged to the second leg link of the leg structure via the second leg link hinge shaft, and the rear end of the fourth link is hinged to the fifth link via the fifth link hinge shaft. The front end of the sixth link is hinged to the second leg link via the second leg link hinge shaft. The rear end of the sixth link is hinged to the transmission rod via the sixth link transmission rod hinge shaft. The upper end of the transmission rod is rotatably mounted on the seat mounting plate. The backrest control component is hinged to the upper end of the rear support component via the backrest control component hinge shaft. The lower end of the rear support component is hinged to the rear end of the base. The backrest control component is hinged to the lower end of the protective component via the backrest control component protective component hinge shaft. The backrest control component is hinged to the backrest link via the backrest control component backrest link hinge shaft.

6. The seat mechanical extension device according to claim 4, characterized in that: The drive unit uses a slider motor and is installed at both ends of the base. The slider of the drive unit is hinged to the drive unit connector, and the drive unit connector is hinged to the drive rod in the connecting assembly. The drive rod is installed on the seat mounting plate.

7. The seat mechanical extension device according to claim 4, characterized in that: When lying down, the height difference between the highest position of the leg structure and the highest position of the backrest is between 160 mm and 170 mm.

8. The seat mechanical extension device according to claim 4, characterized in that: The reclining angle of the backrest is between 29 and 31 degrees.

9. The seat mechanical extension device according to claim 5, characterized in that: The backrest control component is provided with a backrest control component reset spring mounting pin, and a reset spring is installed between the backrest control component reset spring mounting pin and the seat mounting plate.

10. The seat mechanical extension device according to claim 5, characterized in that: The drive device is a slider motor, which is mounted on the base and hinged to the drive rod through the drive device connector. The drive rod is mounted on the seat mounting plate.

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