Four-way extension device for a seat leg rest
By using the stepless adjustment of the linkage telescopic and leg rest sliding mechanism, combined with the screw motor drive and electronic control, the complexity and adaptability of existing seat leg rest structures have been solved, achieving a simple, stable, lightweight, and self-adjusting seat leg rest, thus improving ride comfort and overall vehicle weight reduction.
Patent Information
- Application Number
- CN202522807428.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-12-30
AI Technical Summary
Existing car seat leg rests have complex structures that make it difficult to achieve stepless adjustment, resulting in an inability to accurately adapt to different body types and sitting habits, thus limiting the improvement of comfort. They also suffer from high assembly difficulty, high cost, and low reliability.
It adopts a linkage telescopic mechanism and a leg support sliding mechanism, combined with a lead screw motor drive, to achieve stepless adjustment. Wear-resistant and high-temperature resistant engineering plastic guide rails and sliding bearings reduce friction and simplify the structure. Equipped with a dual-memory lead screw motor and a customized electronic control system, it achieves adaptive adjustment.
It achieves stepless adjustment of the seat leg rest to adapt to different leg lengths of passengers, significantly improving comfort, reducing the number of parts, simplifying operation steps, reducing weight, improving strength and durability, and supporting adaptive adjustment to meet lightweight requirements.
Smart Images
Figure CN224675947U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of seat technology, and in particular relates to a four-way extension device for seat leg rest. Background Technology
[0002] With the rapid development of the automotive industry, vehicles are no longer limited to their basic function as transportation tools, but are increasingly regarded as mobile living spaces integrating safety, comfort, and intelligence. Therefore, people have placed higher demands on vehicle safety, intelligence, and driving experience. Seats, as one of the core components in the automotive interior system that have the most direct and longest contact with the human body, directly impact user comfort and brand image due to their design level.
[0003] The leg rest in the seat effectively supports the calf and back of the thigh, filling the gap between the legs and the seat when seated, significantly improving blood circulation, relieving fatigue from long-distance driving or riding, and thus greatly enhancing overall ride comfort. Therefore, seats equipped with adjustable leg rests have gradually become standard equipment in mid-to-high-end models and are increasingly favored by consumers.
[0004] However, most car seat leg rests on the market still suffer from significant technological bottlenecks. Many products offer only a limited number of fixed angle adjustment levels, lacking continuous stepless adjustment capabilities. This results in an inability to accurately adapt to users of different body types and sitting postures, limiting improvements in comfort. Although some high-end models have incorporated leg rest mechanisms with multi-directional adjustment functions, their structures are generally quite complex, relying on the coordinated operation of numerous mechanical parts. This not only increases assembly difficulty and manufacturing costs but also leads to reduced reliability and higher failure rates. Furthermore, complex structures often translate to greater weight, hindering the achievement of overall vehicle lightweighting goals.
[0005] Therefore, further improving the leg support telescopic structure of the seat has become a key technological direction that the industry urgently needs to break through. Summary of the Invention
[0006] The purpose of this invention is to provide a novel seat leg support telescopic device that is simple in structure, stable in operation, supports stepless adjustment, is easy to integrate, and has the potential for intelligentization.
[0007] The purpose of this utility model is to solve the following problem:
[0008] A four-way extension device for a seat leg rest includes:
[0009] Linkage telescopic mechanism: Mounting plates are symmetrically fixed on both sides of the front cross tube of the seat cushion frame. Each mounting plate is hinged with a first long link and a first short link at intervals. One end of each of the two second long links is hinged to the outer end of the first short link, and the middle part of each of the two second long links is hinged to the middle part of each of the two first long links. The outer end of each of the two first long links is hinged to a second short link. The extension and retraction of the linkage telescopic mechanism is driven by a first lead screw motor.
[0010] Leg support sliding mechanism: includes a fixed plate and a sliding plate. The lower parts of both sides of the fixed plate are respectively hinged to the outer ends of two second long connecting rods and two second short connecting rods. Parallel sliding grooves are provided on both sides of the lower part of the fixed plate. The two sides of the sliding plate are correspondingly slidably installed in the sliding grooves. The second lead screw motor drives the sliding plate to move in the sliding grooves to realize the extension and retraction of the sliding plate on the fixed plate.
[0011] As a further optimization of the above technical solution, a guide rail made of wear-resistant and high-temperature resistant engineering plastic is provided in the slide groove, and sliding bearings provided on both sides of the sliding plate slide on the guide rail.
[0012] As a further optimization of the above technical solution, connecting plates are respectively provided on the lower parts of both sides of the fixing plate, and the outer ends of the two second long connecting rods and the outer ends of the two second short connecting rods are respectively hinged to the connecting plates on both sides.
[0013] As a further optimization of the above technical solution, the two connecting plates are fixedly connected by a support plate, and the support plate is provided with a through hole or clearance groove for the second lead screw of the second lead screw motor.
[0014] As a further optimization of the above technical solution, the fixed plate has a downward folded edge at the center of its rear. The second lead screw motor is fixed on the downward folded edge. The bottom of the sliding plate is fixed with a second threaded sleeve. The second lead screw of the second lead screw motor is screwed onto the second threaded sleeve. The second lead screw motor drives the rotation of the second lead screw, which in turn drives the sliding plate to slide in the grooves on both sides of the fixed plate through the second threaded sleeve.
[0015] As a further optimization of the above technical solution, the second screw sleeve is installed on the fixing bracket, which is riveted or screwed to the bottom of the sliding plate.
[0016] As a further optimization of the above technical solution, the rear sections of the two first long connecting rods are fixedly connected by a first fixed rod, and a rocker arm is fixed on the first fixed rod. The two mounting plates are fixedly connected by a leg support tube. The first lead screw motor is fixed on the leg support tube or the mounting plate. The first lead screw motor drives the first screw sleeve to rotate, and a first lead screw is screwed onto it. One end of the first lead screw is hinged to the rocker arm. The first lead screw motor drives the first screw sleeve to move through the rotating first lead screw, thereby driving the rocker arm to move, and thus driving the extension and retraction of the connecting rod telescopic mechanism.
[0017] As a further optimization of the above technical solution, the front ends of the two second short connecting rods are fixedly connected by a second fixing rod.
[0018] As a further optimization of the above technical solution, a flat plate is provided at the front of the sliding plate, and the upper surface of the flat plate is flush with the upper surface of the fixed plate.
[0019] As a further optimization of the above technical solution, the front end of the flat plate 47 is provided with a downward bend and a backward bend in sequence, and the bends of the downward bend and the backward bend are smoothly transitioned.
[0020] The advantages of this invention compared to the prior art are:
[0021] 1. This utility model features a novel seat leg support telescopic device with a simple structure, stable operation, stepless adjustment support, easy integration, and intelligent potential, enabling car seats to achieve a leapfrog upgrade from "passive support" to "active adaptation," truly realizing a personalized and humanized driving experience.
[0022] 2. The seat leg rest of this utility model is infinitely adjustable by the first and second lead screw motors to adapt to passengers with different leg lengths, effectively supporting the calf and the back of the thigh, filling the gap between the legs and the seat in the sitting position, significantly improving blood circulation, relieving fatigue caused by long-distance driving or riding, and thus greatly improving the overall riding comfort.
[0023] 3. The leg support of this utility model not only realizes the two-stage extension adjustment function of the linkage telescopic mechanism and the leg support sliding mechanism, but also effectively reduces the number of assembly parts, further simplifies the operation steps, and ensures the accuracy and strength of the entire component.
[0024] 4. If this utility model adopts a dual-memory lead screw motor and is paired with a customized electronic control system, it can be further expanded into an adaptive or zero-gravity adjustment mode, which can automatically adjust to the optimal support position according to the passenger's body shape and sitting posture habits, minimize lower limb pressure, promote blood circulation, and significantly improve the comfort and health experience of long-distance travel.
[0025] 5. If the leg support portion of the seat is manufactured using aluminum alloy metal injection, one-piece die casting, or CNC machining technology, the optimized structural design reduces the weight from 3.834 kg to only 1.317 kg compared to a traditional steel leg support mechanism of the same specifications, a weight reduction of approximately 65.6%. This not only achieves seat lightweighting but also improves seat strength and durability, meeting the requirements of automotive lightweighting and environmental protection.
[0026] 6. This utility model has a simple structure, stable operation, stepless adjustment, and comfortable use. It is suitable for use in various vehicle seats, airplane seats, and even home sofas and office chairs. Attached Figure Description
[0027] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model.
[0028] Figure 2 This is the second three-dimensional schematic diagram of this utility model.
[0029] Figure 3 This is a front view of the linkage telescopic mechanism and the leg support sliding mechanism of this utility model.
[0030] Figure 4 This is one of the three-dimensional schematic diagrams of the linkage telescopic mechanism and the leg support sliding mechanism of this utility model.
[0031] Figure 5 This is the second three-dimensional schematic diagram of the linkage telescopic mechanism and the leg support sliding mechanism of this utility model. Detailed Implementation
[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figures 1-5 :
[0033] A four-way extension device for a seat leg rest includes:
[0034] Linkage telescopic mechanism 20: Mounting plates 21 are symmetrically fixed on both sides of the front cross tube 11 of the seat cushion frame 10. The mounting plates 21 include a first mounting plate 211 fixed on both sides of the front cross tube 11 and a second mounting plate 212 fixed on the first mounting plate 211. Each second mounting plate 212 is hinged with a first long connecting rod 24 and a first short connecting rod 23 at intervals. One end of each of the two second long connecting rods 26 is hinged to the outer end of the first short connecting rod 23, and the middle part of each of the two second long connecting rods 26 is hinged to the middle part of each of the two first long connecting rods 24. The outer end of each of the two first long connecting rods 24 is hinged with a second short connecting rod 27. The extension and retraction of the linkage telescopic mechanism 20 is driven by the first lead screw motor 22.
[0035] Leg support sliding mechanism 40: includes a fixed plate 42 and a sliding plate 43. The lower parts of both sides of the fixed plate 42 are respectively hinged to the outer ends of the two second long connecting rods 26 and the outer ends of the two second short connecting rods 27. The lower parts of both sides of the fixed plate 42 are respectively provided with parallel sliding grooves 45. The two sides of the sliding plate 43 are correspondingly slidably disposed in the sliding grooves 45. The second lead screw motor 50 drives the sliding plate 43 to move in the sliding grooves 45 to realize the extension and retraction of the sliding plate 43 on the fixed plate 42.
[0036] As a further optimization of the above technical solution, a guide rail 44 made of wear-resistant and high-temperature resistant engineering plastic is provided in the slide groove 45. The sliding bearings provided on both sides of the sliding plate 43 slide on the guide rail 44. The guide rail 44 has good self-lubrication, wear resistance and high temperature resistance, which can reduce frictional wear during movement.
[0037] As a further optimization of the above technical solution, connecting plates 41 are respectively provided on the lower parts of both sides of the fixing plate 42, and the outer ends of the two second long connecting rods 26 and the outer ends of the two second short connecting rods 27 are respectively hinged to the connecting plates 41 on both sides.
[0038] As a further optimization of the above technical solution, the two connecting plates 41 are fixedly connected by a support plate 46, and the support plate 46 is provided with a through hole or clearance groove for the second lead screw 52 of the second lead screw motor 50.
[0039] As a further optimization of the above technical solution, a downward folded edge 54 is provided at the center of the rear of the fixed plate 42. The second lead screw motor 50 is fixed on the downward folded edge 54. A second threaded sleeve 53 is fixed at the bottom of the sliding plate 43. The second lead screw 52 of the second lead screw motor 50 is screwed onto the second threaded sleeve 53. The second lead screw motor 50 drives the rotation of the second lead screw 52, which in turn drives the sliding plate 43 to slide in the sliding grooves 45 on both sides of the fixed plate 42 through the second threaded sleeve 53.
[0040] As a further optimization of the above technical solution, the second screw sleeve 53 is installed on the fixing frame 51, which is riveted or screwed to the bottom of the sliding plate 43.
[0041] As a further optimization of the above technical solution, the rear sections of the two first long connecting rods 24 are fixedly connected by a first fixed rod 31. A rocker arm 30 is fixed on the first fixed rod 31. The two mounting plates 21 are fixedly connected by a leg support tube 29. The first lead screw motor 22 is fixed on the leg support tube 29 or on one side of the mounting plate 21 (second mounting plate 211) or on the mounting plate 21 and the leg support tube 29. The first lead screw motor 22 drives the first screw sleeve (installed in the housing of the first lead screw motor 22) to rotate, and a first lead screw 25 is screwed onto it. One end of the first lead screw 25 is hinged to the rocker arm 30. The first lead screw motor 22 drives the first screw sleeve to move through the rotating first lead screw, thereby driving the rocker arm 30 to move, thereby driving the extension and retraction of the connecting rod telescopic mechanism 20.
[0042] As a further optimization of the above technical solution, the two second short connecting rods 27 are fixedly connected at their front ends by a second fixed rod 28.
[0043] As a further optimization of the above technical solution, a flat plate 47 is provided at the front of the sliding plate 43, and the upper surface of the flat plate 47 is flush with the upper surface of the fixed plate 42.
[0044] As a further optimization of the above technical solution, the front end of the flat plate 47 is provided with a downward bend 48 and a rear bend 49 in sequence, and the bends of the downward bend 48 and the rear bend 49 are smoothly transitioned.
[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that simple substitutions or modifications can still be made to the technical solutions or technical features described in the foregoing embodiments, and these simple substitutions or modifications do not cause the essence of the corresponding technical solutions to deviate from the spirit and substance of the technical solutions of the embodiments of this utility model, and are still within the protection scope of this utility model.
Claims
1. A four-way extension device for a seat leg rest, characterized in that: include: Linkage telescopic mechanism: Mounting plates are symmetrically fixed on both sides of the front cross tube of the seat cushion frame. Each mounting plate is hinged with a first long link and a first short link at intervals. One end of each of the two second long links is hinged to the outer end of the first short link, and the middle part of each of the two second long links is hinged to the middle part of each of the two first long links. The outer end of each of the two first long links is hinged to a second short link. The extension and retraction of the linkage telescopic mechanism is driven by a first lead screw motor. Leg support sliding mechanism: includes a fixed plate and a sliding plate. The lower parts of both sides of the fixed plate are respectively hinged to the outer ends of two second long connecting rods and two second short connecting rods. Parallel sliding grooves are provided on both sides of the lower part of the fixed plate. The two sides of the sliding plate are correspondingly slidably installed in the sliding grooves. The second lead screw motor drives the sliding plate to move in the sliding grooves to realize the extension and retraction of the sliding plate on the fixed plate.
2. The four-way extension device for a seat leg rest according to claim 1, characterized in that: The groove is equipped with a guide rail made of wear-resistant and high-temperature resistant engineering plastic, and the sliding bearings on both sides of the sliding plate slide on the guide rail.
3. The four-way extension device for a seat leg rest according to claim 1, characterized in that: The lower parts of both sides of the fixed plate are respectively provided with connecting plates, and the outer ends of the two second long connecting rods and the outer ends of the two second short connecting rods are respectively hinged to the connecting plates on both sides.
4. The four-way extension device for a seat leg rest according to claim 3, characterized in that: The two connecting plates are fixedly connected by a support plate, and the support plate is provided with a through hole or clearance groove for the second lead screw of the second lead screw motor.
5. The four-way extension device for a seat leg rest according to claim 1, characterized in that: The fixed plate has a downward folded edge at the center of its rear. The second lead screw motor is fixed on the downward folded edge. The bottom of the sliding plate is fixed with a second threaded sleeve. The second lead screw of the second lead screw motor is screwed onto the second threaded sleeve. The second lead screw motor drives the rotation of the second lead screw, which in turn drives the sliding plate to slide in the grooves on both sides of the fixed plate through the second threaded sleeve.
6. The four-way extension device for a seat leg rest according to claim 5, characterized in that: The second threaded sleeve is mounted on a fixed bracket, which is riveted or screwed to the bottom of the sliding plate.
7. The four-way extension device for a seat leg rest according to claim 1, characterized in that: The rear sections of the two first long connecting rods are fixedly connected by a first fixed rod, and a rocker arm is fixed on the first fixed rod. The two mounting plates are fixedly connected by a leg support tube. The first lead screw motor is fixed on the leg support tube or the mounting plate. The first lead screw motor drives the first threaded sleeve to rotate, and a first lead screw is screwed onto it. One end of the first lead screw is hinged to the rocker arm. The first lead screw motor drives the rotation of the first threaded sleeve, which in turn drives the first threaded sleeve to move through the first lead screw, thereby driving the rocker arm to move, and thus driving the extension and retraction of the connecting rod telescopic mechanism.
8. The four-way extension device for a seat leg rest according to claim 1, characterized in that: The front ends of the two second short connecting rods are fixedly connected by a second fixing rod.
9. A four-way extension device for a seat leg rest according to claim 1, characterized in that: The sliding plate has a flat plate at its front, and the upper surface of the flat plate is flush with the upper surface of the fixed plate.
10. A four-way extension device for a seat leg rest according to claim 9, characterized in that: The front end of the flat plate is provided with a downward bend and a backward bend, and the bends of the downward bend and the backward bend are smoothly transitioned.