Mechanical extension device for electrically powered seat

Abstract

The application relates to an electric seat mechanical stretching device, characterized by comprising two left-right symmetrical mechanical stretching units, a seat frame assembly, a driving device and a base assembly, each mechanical stretching unit comprising a backrest assembly and a leg assembly, the seat frame assembly being slidably arranged at the rear of the base assembly, the leg assembly being hingedly arranged on the seat frame assembly, and the driving device being hingedly arranged on the leg assembly; the driving device comprises a driving front rod, a driving connecting rod, a driving head and a driving slide rail, the driving front rod is connected with the leg assembly, the front end of the driving connecting rod is hingedly connected with the driving front rod, the rear end of the driving connecting rod is hingedly connected with the driving head, the driving head is slidably arranged on the driving slide rail, the rear end of the driving slide rail is hingedly arranged on the base assembly, and the front end of the driving front rod is always located behind the front end of the base assembly. The application simplifies the structural design, reduces the cost, and improves the reliability and safety.

Description

Technical Field

[0001] This application relates to an electric seat frame, and more particularly to the design and application of an electric seat mechanical extension device. Background Technology

[0002] See the invention application publication document with publication number CN 119564015 A, entitled "Mechanical extension device for anti-tilting seat unit and movable seat unit", which has the following defects: 1. The structural design adds a dedicated anti-tilting mechanism. When the motor drives the leg extension device to move forward and open, the extension slide rod drives the support wheel to move forward synchronously, thereby causing the front support position of the seat unit to move forward synchronously, thus achieving anti-tilting. However, this results in a relatively complex structure, high cost, and the motor and anti-tilting mechanism are under heavy load and are prone to damage; 2. When the legs are extended, the motor crossbar of the structural design extends forward and upward, and in the front-back direction, it extends forward beyond the front crossbeam of the seat frame and is very close to the front crossbeam of the seat frame, which may easily hit the user's legs. Summary of the Invention

[0003] The first technical problem solved by this application is to overcome the above-mentioned deficiencies in the prior art and to provide an electric seat mechanical extension device that simplifies structural design, reduces cost, improves reliability, prevents the drive front rod from going forward beyond the seat frame assembly, thereby preventing the user's legs from hitting the drive front rod and improving safety.

[0004] The technical solution adopted by this application to solve the above-mentioned technical problems is: an electric seat mechanical extension device, characterized in that: it consists of two symmetrically arranged mechanical extension units, a seat frame assembly, a drive device, and a base assembly. Each mechanical extension unit consists of a backrest assembly and a leg assembly. The rear part of the seat frame assembly is slidably mounted on the base assembly, and the leg assembly is hinged to the seat frame assembly. The drive device is hinged to the leg assembly. The drive device includes a drive front rod, a drive connecting rod, a drive head, and a drive slide rail. The drive front rod is connected to the leg assembly. The front end of the drive connecting rod is hinged to the drive front rod, and the rear end of the drive connecting rod is hinged to the drive head. The drive head is slidably mounted on the drive slide rail, and the rear end of the drive slide rail is hinged to the base assembly. The front end of the drive front rod is always located behind the front end of the base assembly, ensuring that the drive front rod does not extend out of the base assembly, thereby preventing the user's legs from touching the drive front rod and improving safety.

[0005] The backrest assembly comprises a backrest mounting component, a backrest connecting rod one, a backrest connecting rod two, and a backrest connecting rod three. The backrest mounting component is hinged to one end of each of the backrest connecting rods one and two. The other end of the backrest connecting rod one is hinged to the seat frame assembly. The middle part of the backrest connecting rod two is hinged to the rear of the seat frame assembly via a mounting shaft. The other end of the backrest connecting rod two is hinged to one end of the backrest connecting rod three. The other end of the backrest connecting rod three is hinged to the base assembly via a hinge. The hinge is connected to the base assembly; the backrest mounting piece is provided with a backrest reclining posture limiter. When reclining, the backrest reclining posture limiter contacts the backrest link one, limiting the maximum backward tilt angle of the backrest mounting piece; the backrest link three is provided with a backrest sitting posture (TV posture) limiter. When sitting or in TV posture, the backrest link two contacts the backrest sitting posture (TV posture) limiter, limiting the maximum backward movement of the upper part of the backrest link two relative to the seat frame assembly, thereby limiting the minimum backward tilt angle of the backrest mounting piece.

[0006] The leg assembly described in this application includes leg link one, leg link two, leg link three, leg link four, leg rest mounting plate, leg link five, and foot rest mounting plate. One end of leg link one and one end of leg link two are hinged to the seat frame assembly. The other end of leg link one is hinged to one end of leg link three. The other end of leg link three is hinged to one end of leg rest mounting plate. The other end of leg rest mounting plate is hinged to one end of leg link five. The other end of leg link five is hinged to foot rest mounting plate via a hinge shaft. Foot rest mounting plate is hinged to one end of leg link four via a hinge shaft. Leg link four is hinged to leg rest mounting plate via a hinge shaft. The other end of leg link four is hinged to the other end of leg link two. Leg link two is hinged to leg link three via a hinge shaft. Leg link two is connected to the drive front rod.

[0007] When the user is in a lying position, the highest point of the footrest mounting plate is 600-650 mm above the ground, achieving what is known in this field as a "zero-gravity" posture.

[0008] The footrest mounting plate of this application is between 110 mm and 130 mm in length, expanding its applicability to users of various body types.

[0009] Compared with the prior art, this application has the following advantages and effects: simplified structural design, reduced cost, and improved reliability and safety. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of a seated posture according to an embodiment of this application.

[0011] Figure 2 This is a schematic diagram of the sitting posture from the outside of an embodiment of this application.

[0012] Figure 3 This is a top-view diagram of a seated posture according to an embodiment of this application.

[0013] Figure 4 This is a three-dimensional schematic diagram of a TV pose according to an embodiment of this application.

[0014] Figure 5 This is a schematic diagram of the TV pose outside an embodiment of this application.

[0015] Figure 6 This is a top-view schematic diagram of the TV posture in an embodiment of this application.

[0016] Figure 7 This is a three-dimensional schematic diagram of a lying posture according to an embodiment of this application.

[0017] Figure 8 This is a schematic diagram of the lying position from the outside in an embodiment of this application.

[0018] Figure 9 This is a top-down view of an embodiment of this application in a lying position.

[0019] Figure label:

[0020] 1-Seat frame assembly; 11-Front end of seat frame assembly; 2-Backrest assembly; 21-Backrest mounting piece; 211-Backrest reclining posture limiter; 22-Backrest link one; 23-Backrest link two; 231-Backrest link two mounting shaft; 24-Backrest link three; 241-Backrest sitting / TV posture limiter; 242-Hinge shaft between backrest link three and base assembly; 3-Leg assembly; 31-Leg link one; 32-Leg link two; 321-Leg link two / Leg link three hinge shaft; 33-Leg link three; 34-Leg link four; 341-Leg link four leg rest. 342 - Leg Link 4 Footrest Mounting Plate Hinge Shaft; 35 - Leg Rest Mounting Plate; 36 - Leg Link 5; 361 - Leg Link 5 Footrest Mounting Plate Hinge Shaft; 37 - Footrest Mounting Plate; Leg Link 4 - Drive Device; 41 - Front Drive Rod; 42 - Drive Link; 43 - Drive Head; 44 - Drive Rail; 5 - Base Assembly; 51 - Front Support; 52 - Rear Support; 53 - Seat Frame Rail; α - Backrest Mounting Plate Rear Tilt Angle; H - Distance between the highest point of the footrest mounting plate and the ground when lying down; L - Front Length of the Footrest Mounting Plate. Detailed Implementation

[0021] 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 2 In other words, Figure 2 Left is front, right is back.

[0022] See Figures 1-9This embodiment applies to a drive device 4 (specifically a motor) mounted on a base assembly 5. It drives the electric seat mechanical extension device for posture changes through two main processes. The rear of the seat frame assembly 1 is slidably mounted on the base assembly 5, and the leg assembly 3 is hinged to the seat frame assembly 1. The drive device 4 is hinged to the leg assembly 3. This embodiment has two action processes. In the first process (posture change between sitting and TV posture), the drive device 4 drives the drive linkage 42 via the drive head 43, which in turn drives the drive front rod 41. The two ends of the drive front rod 41 are connected to the two leg assemblies 3 mounted on both sides, thus opening or closing the leg assemblies 3. The second process (posture change between TV posture and reclining posture) is as follows: When the leg assembly 3 is fully open, the user controls the drive head 43 to continue moving forward. At this time, the leg assembly 3 is constrained by its own limiting mechanism (existing technology) and cannot continue to open. Therefore, the drive head 43 drives the leg assembly 3 and the front of the connected seat frame assembly 1 to move forward and upward until the reclining posture or the change from the reclining posture to the TV posture. The electric seat mechanical extension device of this application is characterized by consisting of two symmetrically arranged mechanical extension units, a seat frame assembly 1, a drive device 4, and a base assembly 5 (excluding the anti-tilting mechanism of the prior art). Each mechanical extension unit consists of a backrest assembly 2 and a leg assembly 3. This application eliminates the anti-tilting mechanism, thereby simplifying the structural design, reducing costs, and improving reliability. The drive device 4 of this application includes a drive front rod 41, a drive connecting rod 42, a drive head 43, and a drive slide rail 44. The drive front rod 41 is connected to the leg assembly 3. The front end of the drive connecting rod 42 is hinged to the drive front rod 41, and the rear end of the drive connecting rod 42 is hinged to the drive head 43. The drive head is slidably mounted on the drive slide rail 44, and the rear end of the drive slide rail 44 is hinged to the base assembly 5. The front end of the drive front rod 41 is always located behind the front end 11 of the base assembly, ensuring that the drive front rod 41 does not extend out of the base assembly 1, thereby preventing the user's legs from touching the drive front rod 41 and improving safety.

[0023] The backrest assembly 2 consists of a backrest mounting member 21, a backrest connecting rod 1 22, a backrest connecting rod 23, and a backrest connecting rod 3 24. The backrest mounting member 21 is hinged to one end of the backrest connecting rod 1 22 and the backrest connecting rod 23, respectively. The other end of the backrest connecting rod 1 22 is hinged to the seat frame assembly 1. The middle part of the backrest connecting rod 23 is mounted on the rear of the seat frame assembly 1 through the backrest connecting rod 2 mounting shaft 231. The other end of the backrest connecting rod 23 is hinged to one end of the backrest connecting rod 3 24. The other end of the backrest connecting rod 3 24 is hinged to the base assembly 5 through the hinge shaft 242 of the base assembly 5. The backrest mounting member 21 is provided with a backrest reclining posture limiter 211. When reclining, the backrest reclining posture limiter 211 touches the backrest connecting rod 1 22, limiting the maximum tilt angle of the backrest mounting member 21 (see...). Figure 8The backrest link 24 is equipped with a backrest sitting posture TV posture limiter 241. The backrest link 23 contacts the backrest sitting posture TV posture limiter 241 when in the sitting or TV posture, limiting the maximum backward movement of the upper part of the backrest link 23 relative to the seat frame assembly 1, thereby limiting the minimum backward tilt angle of the backrest mounting member 21 (see...). Figure 2 , Figure 5 ).

[0024] The leg assembly described in this application includes a leg link 1 31, a leg link 2 32, a leg link 33, a leg link 4 34, a leg rest mounting plate 35, a leg link 5 36, and a footrest mounting plate 37. One end of the leg link 1 31 and one end of the leg link 2 32 are hinged to the seat frame assembly 1. The other end of the leg link 1 31 is hinged to one end of the leg link 33. The other end of the leg link 33 is hinged to one end of the leg rest mounting plate 35. The other end of the leg rest mounting plate 35 is hinged to one end of the leg link 5 36. The other end of rod 5 36 is hinged to foot mounting plate 37 via hinge shaft 361 of foot mounting plate of leg connecting rod 5. Foot mounting plate 37 is hinged to one end of leg connecting rod 4 34 via hinge shaft 342 of foot mounting plate of leg connecting rod 4. Leg connecting rod 4 34 is hinged to foot mounting plate 35 via hinge shaft 341 of leg mounting plate of leg connecting rod 4. The other end of leg connecting rod 4 34 is hinged to the other end of leg connecting rod 2 32. Leg connecting rod 2 32 is hinged to leg connecting rod 33 via hinge shaft 321 of leg connecting rod 2 and leg connecting rod 3.

[0025] When the applicant is in a lying position, the distance H between the highest point of the footrest mounting plate 37 and the ground is between 600 mm and 650 mm, achieving what is known in this field as a "zero gravity" posture.

[0026] The length L of the footrest mounting plate 37 in this application is between 110 mm and 130 mm, expanding its applicability to users of various body types.

[0027] Any parts not described in this application are prior art or substantially the same as those in the prior art documents, and will not be described in detail here.

[0028] Any simple variations 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. An electric seat mechanical extension device, characterized in that: It consists of two symmetrically arranged mechanical extension units, a seat frame assembly, a drive device, and a base assembly. Each mechanical extension unit consists of a backrest assembly and a leg assembly. The rear of the seat frame assembly is slidably mounted on the base assembly, and the leg assembly is hinged to the seat frame assembly. The drive device is hinged to the leg assembly. The drive device includes a drive front rod, a drive connecting rod, a drive head, and a drive slide rail. The drive front rod is connected to the leg assembly, the front end of the drive connecting rod is hinged to the drive front rod, and the rear end of the drive connecting rod is hinged to the drive head. The drive head is slidably mounted on the drive slide rail, and the rear end of the drive slide rail is hinged to the base assembly. The front end of the drive front rod is always located behind the front end of the base assembly.

2. The electric seat mechanical extension device according to claim 1, characterized in that: The backrest assembly consists of a backrest mounting component, a backrest connecting rod one, a backrest connecting rod two, and a backrest connecting rod three. The backrest mounting component is hinged to one end of each of the backrest connecting rod one and backrest connecting rod two. The other end of the backrest connecting rod one is hinged to the seat frame assembly. The middle part of the backrest connecting rod two is hinged to the rear of the seat frame assembly via a mounting shaft. The other end of the backrest connecting rod two is hinged to one end of the backrest connecting rod three. The other end of the backrest connecting rod three is hinged to the base assembly via a hinge shaft. The backrest mounting component is provided with a backrest reclining posture limiter, which contacts the backrest connecting rod one when in a reclining posture. The backrest connecting rod three is provided with a backrest sitting posture (TV posture) limiter, which contacts the backrest connecting rod two when in a sitting or TV posture.

3. The electric seat mechanical extension device according to claim 1, characterized in that: The leg assembly includes leg link one, leg link two, leg link three, leg link four, leg rest mounting plate, leg link five, and foot rest mounting plate. One end of leg link one and one end of leg link two are hinged to the seat frame assembly. The other end of leg link one is hinged to one end of leg link three. The other end of leg link three is hinged to one end of leg rest mounting plate. The other end of leg rest mounting plate is hinged to one end of leg link five. The other end of leg link five is hinged to foot rest mounting plate via a hinge shaft. Foot rest mounting plate is hinged to one end of leg link four via a hinge shaft. Leg link four is hinged to leg rest mounting plate via a hinge shaft. The other end of leg link four is hinged to the other end of leg link two. Leg link two is hinged to leg link three via a hinge shaft. Leg link two is connected to the drive front rod.

4. The electric seat mechanical extension device according to claim 3, characterized in that: When lying down, the highest point of the footrest mounting plate is between 600 mm and 650 mm from the ground.

5. The electric seat mechanical extension device according to claim 3, characterized in that: The front length of the foot mounting plate is between 110 mm and 130 mm.

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