Five-connecting-rod four-way leg support

Abstract

The utility model relates to a five-connecting-rod four-way leg support which comprises a leg supporting plate, a five-connecting-rod structure used for pushing the leg supporting plate to stretch out and retract back and a fixing plate fixed to the five-connecting-rod structure, and the fixing plate is provided with a driving assembly used for driving the five-connecting-rod structure to stretch out and draw back. Five connecting rods of the five-connecting-rod structure are the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod and the fifth connecting rod, first rotating pairs are arranged on the fixing plate and the third connecting rod, second rotating pairs are arranged on the fixing plate and the second connecting rod, fourth rotating pairs are arranged on the second connecting rod and the fourth connecting rod, and fifth rotating pairs are arranged on the second connecting rod and the fifth connecting rod. The third connecting rod and the fourth connecting rod are each provided with a third rotating pair, the fifth connecting rod and the first connecting rod are each provided with a seventh rotating pair, the first connecting rod and the fourth connecting rod are each provided with a sixth rotating pair, and the fixing plate is rotationally connected with the rotating pairs on the different connecting rods. The utility model has the advantage that the comfort is improved.

Description

Technical Field

[0001] This utility model belongs to the field of five-link four-way leg support technology, specifically relating to a five-link four-way leg support. Background Technology

[0002] A five-link four-way leg rest is a leg support device used in car seats. It has four-way adjustment and its structure uses five links for connection and transmission.

[0003] Currently, Chinese patent CN213109108U discloses an electric four-way leg support mechanism, including a front support, a rear support, a leg support plate, a linkage component, and a first drive component. The linkage component includes first, second, third, and fourth links. One end of the first link is hinged to the middle of the rear support, one end of the second link is hinged to the front end of the rear support, the other end of the first link is hinged to one end of the third link, the middle of the second link is hinged to the middle of the third link, the other end of the third link is hinged to the rear end of the front support, and the other end of the second link is hinged to one end of the fourth link. In use, the linkage component is driven by the first drive component to adjust the leg support plate, and the extension and retraction adjustment of the extension plate is achieved by the second drive component, which facilitates adjustment. However, after extension and retraction, the highest point of the leg support plate may be too high, causing a foreign body sensation in the legs and affecting overall comfort. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a five-link four-way leg rest that improves comfort.

[0005] The technical solution of this utility model is as follows:

[0006] A five-bar linkage four-way leg support includes a leg support plate, a five-bar linkage structure for pushing the leg support plate to extend and retract, and a fixed plate fixed to the five-bar linkage structure. The fixed plate is provided with a drive assembly for driving the extension and retraction of the five-bar linkage structure. The five links of the five-bar linkage structure are link one, link two, link three, link four, and link five. The fixed plate and link three are each provided with a revolute joint one; the fixed plate and link two are each provided with a revolute joint two; link two and link four are each provided with a revolute joint four; link two and link five are each provided with a revolute joint five; link three and link four are each provided with a revolute joint three; link five and link one are each provided with a revolute joint seven; and link one and link four are each provided with a revolute joint six. The fixed plate and the revolute joints on the different links are rotatably connected.

[0007] The dimension between rotary joint 1 and rotary joint 2 is 25-30mm, the dimension between rotary joint 2 and rotary joint 4 is 70-75mm, the dimension between rotary joint 4 and rotary joint 5 is 30-35mm, the dimension between rotary joint 1 and rotary joint 3 is 90-100mm, the dimension between rotary joint 3 and rotary joint 4 is 30-35mm, the dimension between rotary joint 4 and rotary joint 6 is 80-90mm, the dimension between rotary joint 5 and rotary joint 7 is 70-80mm, and the dimension between rotary joint 6 and rotary joint 7 is 40-45mm.

[0008] Furthermore, the drive assembly includes a worm gear assembly fixed on the fixed plate and a telescopic motor that drives the worm gear assembly. The worm gear assembly is connected to a rotating handle, which is connected to a connecting rod three to drive the extension and retraction of the five-bar linkage. The telescopic motor is detachably mounted on the fixed plate.

[0009] Furthermore, the worm gear assembly includes a mounting housing and a drive rod. The drive rod is threadedly connected to a worm gear, which drives a worm gear rotatably connected within the mounting housing. The worm gear is connected to a telescopic motor, the worm gear is rotatably connected within the mounting housing, and the drive rod is connected to a rotating handle.

[0010] Furthermore, the connecting rod is connected to a support plate, the support plate is slidably connected to a sliding plate, the leg support plate is fixed to the sliding plate, and the sliding plate is connected to a lateral movement component located on the support plate.

[0011] Furthermore, two U-shaped contact plates are arranged laterally on the upper side of the support plate, and a support strip is arranged laterally in the middle of the contact plate. At least one sliding connecting plate is provided on the contact plate. The sliding connecting plate is T-shaped and has a gap between its upper end and the top of the contact plate. The sliding plate has a groove. The width of the groove is smaller than the maximum diameter of the sliding connecting plate but greater than or equal to the minimum diameter of the sliding connecting plate. The sliding plate is disposed in the gap between the contact plates through the groove, and the sliding plate contacts the support strip.

[0012] Furthermore, the traverse assembly includes a traverse motor fixed to a support plate, a threaded connecting block fixed to a sliding plate, and a traverse lead screw threadedly connected to the threaded connecting block, wherein the traverse lead screw is connected to the traverse motor.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, through the setting of the rotational joint dimensions of different connecting rods, allows the front end of the leg support plate to provide maximum forward support while ensuring that the highest point of the front end of the leg support plate does not rise too high. The change in lifting height from before to after lifting is only 22mm. This also reduces the pulling on the cover after the seat is fully wrapped and the leg support plate is unfolded, ensuring a comfortable leg experience and conforming to the lower leg. This allows the seat to be fully wrapped with the leg support plate, and ensures the aesthetics of the seat wrapping when the leg support plate is unfolded. When the leg support plate is lifted, the leg support does not rise too high, and the trajectory ensures maximum front support, resulting in a significant improvement in both comfort and aesthetics.

[0015] In summary, this invention has the advantage of improving comfort. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A schematic diagram of the structure after the leg support plate has been removed;

[0018] Figure 3 This utility model Figure 2 A schematic diagram of the structure after the sliding plate is removed;

[0019] Figure 4 This utility model Figure 1 A schematic diagram of a five-bar linkage structure;

[0020] Figure 5 This utility model Figure 1 A diagram showing the height difference between the extended and retracted leg support plates.

[0021] In the diagram, 1. Leg support plate, 2. Sliding plate, 3. Five-bar linkage, 32. Link 2, 321. Rotary joint 4, 33. Link 4, 34. Link 1, 341. Rotary joint 6, 35. Link 5, 351. Rotary joint 7, 352. Rotary joint 5, 36. Link 3, 361. Rotary joint 3, 4. Fixed plate, 41. Rotary joint 1, 42. Rotary joint 2, 5. Worm gear assembly, 6. Telescopic motor, 7. Support plate, 8. Rotating handle, 9. Drive rod, 10. Horizontal movement motor, 11. Horizontal movement screw, 12. Threaded connecting block, 13. Contact plate, 14. Sliding connecting plate, 15. Support bar. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1-5 As shown, a five-bar linkage four-way leg support includes a leg support plate 1, a five-bar linkage structure 3 for pushing the leg support plate 1 to extend and retract, and a fixing plate 4 fixed to the five-bar linkage structure 3. The fixing plate 4 is provided with a drive assembly for driving the extension and retraction of the five-bar linkage structure 3. The five links of the five-bar linkage structure 3 are link 1 34, link 2 32, link 36, link 4 33, and link 5 35. A rotary joint 1 41 is provided on the fixing plate 4 and link 3 36. Both connecting rod 2 and connecting rod 32 are provided with rotary joint 2 42, connecting rod 2 and connecting rod 4 are provided with rotary joint 4 321, connecting rod 2 and connecting rod 5 are provided with rotary joint 5 352, connecting rod 36 and connecting rod 4 are provided with rotary joint 361, connecting rod 5 35 and connecting rod 1 34 are provided with rotary joint 7 351, connecting rod 1 34 and connecting rod 4 33 are provided with rotary joint 6 341, and the fixed plate 4 and the rotary joints on different connecting rods are rotatably connected;

[0024] The dimension between rotary joint 1 41 and rotary joint 2 42 is 25-30mm; the dimension between rotary joint 2 42 and rotary joint 4 321 is 70-75mm; the dimension between rotary joint 4 321 and rotary joint 5 352 is 30-35mm; the dimension between rotary joint 1 41 and rotary joint 361 is 90-100mm; the dimension between rotary joint 361 and rotary joint 4 321 is 30-35mm; the dimension between rotary joint 4 321 and rotary joint 6 341 is 80-90mm; the dimension between rotary joint 5 352 and rotary joint 7 351 is 70-80mm; and the dimension between rotary joint 6 341 and rotary joint 7 351 is 40-45mm. There are two sets of fixed plate 4 and five connecting rods, which are mirrored.

[0025] In use, the drive assembly pushes the connecting rod to rotate around the first revolute joint 41, causing the second connecting rod 32 to rotate around the second revolute joint 42, thus triggering a chain reaction that drives the fourth connecting rod 33, the fifth connecting rod 35, and the first connecting rod 34 to rotate around the corresponding revolute joints 361, 321, 352, 341, and 351, respectively. Finally, the first connecting rod 34 reaches the target position, maximizing the forward support of the leg support plate 1 while ensuring that the highest point of the leg support front does not rise excessively (e.g., Figure 5Before and after lifting, the height change is only 22mm. This reduces the pulling on the cover after the leg rest 1 is unfolded, ensuring a comfortable leg experience and conforming to the lower leg. This allows the seat to be seamlessly integrated with the leg rest 1, while also ensuring the aesthetics of the seat cover after the leg rest 1 is unfolded. When the leg rest 1 is lifted, it will not be raised too high, ensuring leg comfort. At the same time, the trajectory can ensure maximum front support, resulting in a significant improvement in both comfort and aesthetics.

[0026] Preferably, the rotary joint is a riveted bushing, and the riveted bushings on the two connecting rods are directly riveted together by rivets between different rotary joints.

[0027] In this embodiment, the drive assembly includes a worm gear assembly 5 fixed on the fixed plate 4 and a telescopic motor 6 that drives the worm gear assembly 5. The worm gear assembly 5 is connected to a rotating handle 8, which is connected to the connecting rod 36 via a transmission shaft to drive the five-bar linkage 3 to extend and retract. The telescopic motor 6 is detachably mounted on the fixed plate 4, wherein the detachable connection method is bolt fixing.

[0028] In use, the telescopic motor 6 drives the worm gear assembly 5 to drive the connecting rod 36, thereby driving the five-bar linkage 3 to work.

[0029] In this embodiment, the worm gear assembly 5 includes a mounting housing and a drive rod 9. The drive rod 9 is threadedly connected to a worm gear, which drives a worm gear rotatably connected to the mounting housing. The worm gear is connected to a telescopic motor 6, and the worm gear is rotatably connected to the mounting housing. The drive rod 9 is connected to a rotating handle 8.

[0030] In use, the worm gear drives the worm wheel to rotate, and the worm wheel drives the drive rod 9 to extend and retract through the thread.

[0031] In this embodiment, the connecting rod 34 is connected to the support plate 7, the support plate 7 is slidably connected to the sliding plate 2, the leg support plate 1 is fixed on the sliding plate 2, and the sliding plate 2 is connected to the transverse moving component located on the support plate 7.

[0032] In use, the sliding plate 2 is driven to slide by the overflow component, thereby driving the extension and retraction adjustment of the leg support plate 1, which facilitates the adjustment of the position of the leg support plate 1.

[0033] In this embodiment, two U-shaped contact plates 13 are fixed laterally on the upper side of the support plate 7. A support strip 15 is fixed laterally in the middle of the contact plate 13. At least two sliding connecting discs 14 with front and rear offsets are provided on the contact plate 13. The sliding connecting disc 14 is T-shaped and there is a gap between the lower part of its upper end and the top of the contact plate 13. The sliding plate 2 has four sliding grooves with front and rear offsets. The width of the sliding groove is less than the maximum diameter of the sliding connecting disc 14 but greater than or equal to the minimum diameter of the sliding connecting disc 14. The sliding plate 2 is set in the gap between the contact plates 13 through the sliding grooves. The sliding plate 2 is in contact with the support strip 15.

[0034] In use, a sliding part is formed between the sliding connecting plate 14 and the contact plate 13. The sliding part and the sliding groove are used to achieve the sliding connection between the support plate 7 and the sliding plate 2. The support bar 15 is used to increase the sliding support point of the sliding plate 2.

[0035] In this embodiment, the transverse assembly includes a transverse motor 10 fixed on the support plate 7, a threaded connecting block 12 fixed on the sliding plate 2, and a transverse lead screw 11 threadedly connected to the threaded connecting block 12. The transverse lead screw 11 is connected to the transverse motor 10.

[0036] In use, the transverse motor 10 drives the transverse lead screw 11 to rotate, and as the transverse lead screw 11 rotates, the threaded connecting block 12 moves laterally.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features; any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A five-link four-way leg support, comprising a leg support plate, a five-link structure for pushing the leg support plate to extend and retract, and a fixing plate fixed to the five-link structure, wherein the fixing plate is provided with a driving component for driving the extension and retraction of the five-link structure, characterized in that: The five links of the five-bar linkage structure are link one, link two, link three, link four, and link five. A revolute joint one is provided on the fixed plate and link three; a revolute joint two is provided on the fixed plate and link two; a revolute joint four is provided on link two and link four; a revolute joint five is provided on link two and link five; a revolute joint three is provided on link three and link four; a revolute joint seven is provided on link five and link one; and a revolute joint six is ​​provided on link one and link four. The revolute joints on the fixed plate and different links are rotatably connected. The dimension between rotary joint 1 and rotary joint 2 is 25-30mm, the dimension between rotary joint 2 and rotary joint 4 is 70-75mm, the dimension between rotary joint 4 and rotary joint 5 is 30-35mm, the dimension between rotary joint 1 and rotary joint 3 is 90-100mm, the dimension between rotary joint 3 and rotary joint 4 is 30-35mm, the dimension between rotary joint 4 and rotary joint 6 is 80-90mm, the dimension between rotary joint 5 and rotary joint 7 is 70-80mm, and the dimension between rotary joint 6 and rotary joint 7 is 40-45mm.

2. The five-link four-way leg support according to claim 1, characterized in that: The drive assembly includes a worm gear assembly fixed on a fixed plate and a telescopic motor that drives the worm gear assembly. The worm gear assembly is connected to a rotating handle, which is connected to a connecting rod three to drive the extension and retraction of the five-bar linkage. The telescopic motor is detachably mounted on the fixed plate.

3. The five-link four-way leg support according to claim 2, characterized in that: The worm gear assembly includes a mounting housing and a drive rod. The drive rod is threadedly connected to a worm gear, which drives a worm rotatably connected within the mounting housing. The worm is connected to a telescopic motor, the worm gear is rotatably connected within the mounting housing, and the drive rod is connected to a rotating handle.

4. The five-link four-way leg support according to claim 1, characterized in that: The connecting rod is connected to a support plate, the support plate is slidably connected to a sliding plate, the leg support plate is fixed to the sliding plate, and the sliding plate is connected to a lateral movement component located on the support plate.

5. The five-link four-way leg support according to claim 4, characterized in that: The support plate has two U-shaped contact plates arranged laterally on its upper side. A support strip is arranged laterally in the middle of the contact plate. At least one sliding connecting plate is provided on the contact plate. The sliding connecting plate is T-shaped and has a gap between its upper end and the top of the contact plate. The sliding plate has a groove. The width of the groove is smaller than the maximum diameter of the sliding connecting plate but greater than or equal to the minimum diameter of the sliding connecting plate. The sliding plate is positioned in the gap between the contact plates through the groove and contacts the support strip.

6. The five-link four-way leg support according to claim 4, characterized in that: The traverse assembly includes a traverse motor fixed to a support plate, a threaded connecting block fixed to a sliding plate, and a traverse lead screw threadedly connected to the threaded connecting block, wherein the traverse lead screw is connected to the traverse motor.

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