Leg extension device and massage chair

Abstract

A leg extension device and a massage chair, comprising an upper leg frame, a middle leg frame and a lower leg frame, wherein the upper leg frame is provided with an inflatable and deflable airbag, and the middle leg frame is pushed by the inflation of the airbag, so that the middle leg frame releases the lower leg frame and extends, thereby changing the length of the leg device. Compared with electric extension, the upper leg frame and the lower leg frame can realize the leg pulling function after being wrapped with airbags respectively. Since electric extension may injure people, this is a new experience that cannot be realized by electric extension; compared with traditional spring extension, inflatable extension can help users save effort and prevent their legs from loosening. Therefore, the use of pneumatic solution not only realizes a solution with lower cost than electric extension, but also can realize automatic extension and improve user experience; in addition, a differential device is provided between the middle leg frame and the lower leg frame, and the differential device can amplify the displacement of the middle leg frame, that is, the displacement distance of the lower leg frame is several times the displacement distance of the middle leg frame, reducing the requirements for the displacement space of the middle leg frame and reducing the volume of the leg extension device.

Description

Technical Field

[0001] This utility model relates to the field of massage chair devices, and more particularly to a leg extension device and a massage chair. Background Art

[0002] At present, the leg extension devices of common massage chairs on the market usually adopt electric extension and spring extension. Electric extension can realize the function of automatic extension. In order to avoid personal injuries such as strain, electric extension requires additional length detection and anti-pinch detection modules, resulting in its high cost; the technical solution of spring extension, although the production cost is significantly lower than electric extension, does not have the automatic extension function, and needs to rely on the user's own leg extension to drive the leg device to extend and retract, resulting in a poor user experience.

[0003] Therefore, it is necessary to develop a telescopic device that is cheaper than electric telescopic devices and has automatic telescopic function. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a leg extension device and a massage chair.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A leg extension device includes an upper leg frame, a middle leg frame, and a lower leg frame. The ends of the middle leg frame are respectively adapted to be extended and retracted to fit the upper and lower leg frames. The upper leg frame is provided with an inflatable and deflable airbag connected to the middle leg frame. When the airbag inflates, it pushes the middle leg frame to extend. The middle leg frame extends the lower leg frame via a differential device, and the extension distance of the lower leg frame is twice that of the middle leg frame.

[0007] The differential device includes a first fixing part provided on the upper leg frame, a second fixing part provided on the lower leg frame, and a transmission part provided on the middle leg frame. The first fixing part and the second fixing part are located on both sides of the transmission part, and the transmission part is tractively connected to the first fixing part and the second fixing part.

[0008] Furthermore, the upper leg frame is provided with a first ear seat, the lower leg frame is provided with a second ear seat, and the middle leg frame is provided with a rotating part; it also includes a connecting belt, one end of the connecting belt is connected to the first ear seat, and the other end of the connecting belt is connected to the second ear seat after passing around the rotating part, the first ear seat constitutes the first fixed part, the second ear seat constitutes the second fixed part, and the rotating part constitutes the transmission part.

[0009] Furthermore, the rotating part includes a third ear seat, the third ear seat is provided with a rotating wheel, and the middle part of the connecting belt is attached to the rotating wheel.

[0010] Furthermore, the upper leg frame is provided with a first rack, the lower leg frame is provided with a second rack, and the middle leg frame is provided with a rotatable gear. The gear is driven by the first rack and the second rack. The first rack constitutes the first fixing part, the second rack constitutes the second fixing part, and the gear constitutes the transmission part.

[0011] Furthermore, the upper leg frame is provided with an upper leg shell, and the lower leg frame is provided with a lower leg shell.

[0012] Furthermore, it also includes a return spring, the two ends of which are respectively connected to the upper leg frame and the middle leg frame.

[0013] Furthermore, the upper leg frame is provided with a first guide rail, the middle leg frame is provided with a second guide rail, the middle leg frame is movably telescopically adapted to the first guide rail, and the lower leg frame is movably telescopically adapted to the second guide rail.

[0014] Furthermore, the lower leg frame is provided with a plurality of rollers that are adapted to roll on the second guide rail.

[0015] A massage chair includes a frame and a leg extension device as described above, wherein the upper leg rest is pivotally connected to the frame.

[0016] The beneficial effects of the utility model are:

[0017] This utility model discloses a leg extension device and massage chair, including an upper leg frame, a middle leg frame, and a lower leg frame. The upper leg frame is equipped with an inflatable airbag. By inflating the airbag, the middle leg frame is pushed, causing it to release and the lower leg frame to extend, thereby changing the length of the leg device. Compared to electric extension, the upper and lower leg frames, each wrapped with an airbag, can achieve a leg-stretching function. Since electric extension can cause injury, this is a new experience that electric extension cannot provide. Compared to traditional spring extension, inflatable extension helps users save effort and prevents their legs from becoming loose.

[0018] Therefore, adopting a pneumatic solution not only achieves a lower cost than an electric telescopic solution, but also enables automatic telescopic movement, improving the user experience. In addition, a differential device is provided between the middle leg frame and the lower leg frame. This differential device can amplify the displacement of the middle leg frame, that is, the displacement distance of the lower leg frame is several times that of the middle leg frame, reducing the requirements for the displacement space of the middle leg frame and reducing the volume of the leg telescopic device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the telescopic device in its initial position according to Embodiment 1 of this utility model;

[0021] Figure 2 This is a schematic diagram of the telescopic device in the extended position according to Embodiment 1 of this utility model;

[0022] Figure 3 This is a schematic diagram of the telescopic device in its initial position according to Embodiment 1 of this utility model (upper leg shell omitted);

[0023] Figure 4 This is a schematic diagram of the telescopic device in the extended position according to Embodiment 1 of this utility model (upper leg shell omitted);

[0024] Figure 5 This is a side view of the telescopic device in its initial position according to Embodiment 1 of this utility model (upper leg shell omitted);

[0025] Figure 6 This is a side view of the telescopic device in the extended position according to Embodiment 1 of this utility model (upper leg shell omitted);

[0026] Figure 7 This is an exploded view of the leg extension device in its initial position according to Embodiment 1 of this utility model;

[0027] Figure 8 This is a schematic diagram of the telescopic device in its initial position according to Embodiment 2 of this utility model;

[0028] Figure 9 This is a schematic diagram of the telescopic device in the extended position according to Embodiment 2 of this utility model;

[0029] In the diagram, 10 is the upper leg frame; 101 is the first guide rail; 20 is the middle leg frame; 201 is the second guide rail; 30 is the lower leg frame; 301 is the roller; 40 is the airbag; 501 is the first ear seat; 502 is the second ear seat; 5031 is the third ear seat; 5032 is the rotating wheel; 504 is the connecting belt; 601 is the first rack; 602 is the second rack; 603 is the gear; 701 is the upper leg shell; 702 is the lower leg shell. DETAILED DESCRIPTION

[0030] The following combination Figure 1-9This utility model will be described in detail.

[0031] Example 1

[0032] like Figure 1-7 As shown, a leg extension and retraction device includes an upper leg frame 10, a middle leg frame 20, and a lower leg frame 30. The ends of the middle leg frame 20 are respectively adapted to be retracted and adapted to the upper leg frame 10 and the lower leg frame 30. The upper leg frame 10 is provided with an inflatable airbag 40, which is connected to the middle leg frame 20. The airbag 40 expands and pushes the middle leg frame 20 to extend. The middle leg frame 20 extends the lower leg frame 30 via a differential device, and the extension distance of the lower leg frame 30 is twice the extension distance of the middle leg frame 20. The differential device includes a first fixing portion provided on the upper leg frame 10, a second fixing portion provided on the lower leg frame 30, and a transmission portion provided on the middle leg frame 20. The first and second fixing portions are located on either side of the transmission portion, and the transmission portion is transmission-connected to the first and second fixing portions.

[0033] The leg extension and retraction device proposed in the present invention adopts a pneumatic extension technical solution, which not only has a lower cost than the electric extension solution, but also can realize automatic extension and retraction, thereby improving user experience; in addition, the differential device between the middle leg frame 20 and the lower leg frame 30 has the effect of amplifying the displacement of the middle leg frame 20, that is, the displacement distance of the lower leg frame 30 is several times the displacement distance of the middle leg frame 20, thereby reducing the requirements for the displacement space of the middle leg frame 20 and reducing the volume of the leg extension and retraction device.

[0034] In this embodiment, the upper leg frame 10 is provided with a first lug 501, the lower leg frame 30 is provided with a second lug 502, and the middle leg frame 20 is provided with a rotating portion. The upper leg frame 10 also includes a connecting belt 504, one end of which is connected to the first lug 501, and the other end of which is connected to the second lug 502 after passing through the rotating portion. The first lug 501 constitutes the first fixed portion, the second lug 502 constitutes the second fixed portion, and the rotating portion constitutes the transmission portion. Furthermore, the rotating portion includes a third lug 5031, which is provided with a rotating wheel 5032. The middle portion of the connecting belt 504 is in contact with the rotating wheel 5032. When the middle leg frame 20 moves downward, the friction between the connecting belt 504 and the rotating wheel 5032 is reduced, thereby reducing noise. The rotating wheel 5032 is equivalent to a movable pulley. When the movable pulley moves a distance H, the free end of the connecting belt 504, that is, the end of the connecting belt 504 connected to the lower leg frame 30, moves 2H. At this time, the displacement distance of the lower leg frame 30 is twice the displacement distance of the middle leg frame 20. Based on this, it is understood that those skilled in the art can provide multiple movable pulleys to make the displacement distance of the lower leg frame 30 several times the displacement distance of the middle leg frame 20.

[0035] When the airbag 40 is not inflated, the middle leg rest 20 is in its initial position due to the elasticity of the return spring. The rotating wheel 5032 pulls the connecting belt 504, which in turn pulls the lower leg rest 30 to its initial position. When the airbag 40 inflates, it overcomes the elasticity of the return spring, pushing the middle leg rest 20 out. The rotating wheel 5032 descends with the middle leg rest 20, releasing the connecting belt 504. The lower leg rest 30 then automatically descends under gravity. Since the upper leg rest 10 is connected to the massage chair frame, it does not shift. Therefore, the displacement distance of the lower leg rest 30 is twice that of the middle leg rest 20. After use, the airbag 40 deflates and contracts. The middle leg rest 20 retracts under the elasticity of the return spring, and simultaneously, the rotating wheel 5032 pulls the connecting belt 504 upwards, thus pulling the lower leg rest 30 back to its initial position.

[0036] In this embodiment, the upper leg frame 10 is provided with an upper leg shell 701, and the lower leg frame 30 is provided with a lower leg shell 702.

[0037] In this embodiment, a return spring is also included, with its two ends connected to the upper leg frame 10 and the middle leg frame 20, respectively. When the airbag 40 deflates, the spring force of the return spring is used to return the middle leg frame 20 to its initial position.

[0038] In this embodiment, the upper leg frame 10 is provided with a first guide rail 101, the middle leg frame 20 is provided with a second guide rail 201, the middle leg frame 20 is movably telescopically adapted to the first guide rail 101, the lower leg frame 30 is movably telescopically adapted to the second guide rail 201, and the lower leg frame 30 is provided with a plurality of rollers 301 that are rotatably adapted to the second guide rail 201.

[0039] This utility model also proposes a massage chair, including a frame and a leg extension device as described above. The upper leg frame 10 is pivotally connected to the frame, so that the leg extension device can rotate relative to the frame, thereby improving the user's comfort during use.

[0040] Example 2

[0041] The difference from Embodiment 1 is that this embodiment proposes another differential device.

[0042] In this embodiment, Figure 8-9 As shown, the upper leg frame 10 is provided with a first rack 601, the lower leg frame 30 is provided with a second rack 602, and the middle leg frame 20 is provided with a rotatable gear 603. The gear 603 is driven by the first rack 601 and the second rack 602. The first rack 601 constitutes the first fixed part, the second rack 602 constitutes the second fixed part, and the gear 603 constitutes the transmission part. Its working principle is as follows:

[0043] The airbag 40 is not inflated. Since the upper leg frame 10 is connected to the frame of the massage chair, the upper leg frame 10 cannot be telescopically displaced, and the second rack 602 on the lower leg frame 30 is engaged with the gear 603 of the middle leg frame 20. Therefore, if the middle leg frame 20 does not move, the locking effect between the return spring and the gear 603 will always keep the lower leg frame 30 in the initial position.

[0044] The airbag 40 inflates, overcoming the force of the return spring and pushing the middle leg frame 20 out. The gear 603 descends with the middle leg frame 20. Because the first rack 601 is stationary, the lower leg frame 30 moves twice as far as the middle leg frame 20. After the user finishes using the device, the airbag 40 deflates, causing the middle leg frame 20 to retract under the force of the return spring. Simultaneously, the gear 603 pulls the lower leg frame 30 back to its initial position.

[0045] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand and implement the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. A leg extension device, characterized in that: It comprises an upper leg frame, a middle leg frame and a lower leg frame, the two ends of the middle leg frame are respectively adapted to the upper leg frame and the lower leg frame by movably extending and retracting, the upper leg frame is provided with an inflatable and deflable air bag, and the air bag is connected to the middle leg frame, the air bag expands and pushes the middle leg frame to extend, the middle leg frame extends the lower leg frame through a differential device, and the extension distance of the lower leg frame is twice the extension distance of the middle leg frame; The differential device includes a first fixing part provided on the upper leg frame, a second fixing part provided on the lower leg frame, and a transmission part provided on the middle leg frame. The first fixing part and the second fixing part are located on both sides of the transmission part, and the transmission part is transmission-connected to the first fixing part and the second fixing part.

2. A leg extension device according to claim 1, characterized in that: The upper leg frame is provided with a first ear seat, the lower leg frame is provided with a second ear seat, and the middle leg frame is provided with a rotating part; it also includes a connecting belt, one end of which is connected to the first ear seat, and the other end of the connecting belt is connected to the second ear seat after passing through the rotating part, the first ear seat constitutes the first fixing part, the second ear seat constitutes the second fixing part, and the rotating part constitutes the transmission part.

3. A leg extension device as claimed in claim 2, characterized in that: The rotating part comprises a third ear seat, the third ear seat is provided with a rotating wheel, and the middle part of the connecting belt is in contact with the rotating wheel.

4. A leg extension device according to claim 1, characterized in that: The upper leg frame is provided with a first rack, the lower leg frame is provided with a second rack, and the middle leg frame is provided with a rotatable gear. The gear transmission is matched with the first rack and the second rack. The first rack constitutes the first fixed part, the second rack constitutes the second fixed part, and the gear constitutes the transmission part.

5. A leg extension device as claimed in claim 1, characterized in that: An upper leg shell is disposed outside the upper leg frame, and a lower leg shell is disposed outside the lower leg frame.

6. A leg extension device as claimed in claim 1, characterized in that: It also includes a return spring, and two ends of the return spring are respectively connected to the upper leg frame and the middle leg frame.

7. A leg extension device as claimed in claim 1, characterized in that: The upper leg frame is provided with a first guide rail, the middle leg frame is provided with a second guide rail, the middle leg frame is movably and telescopically adapted to the first guide rail, and the lower leg frame is movably and telescopically adapted to the second guide rail.

8. A leg extension device as claimed in claim 7, characterized in that: The lower leg frame is provided with a plurality of rollers which are rollingly adapted to the second guide rail.

9. A massage chair, comprising a frame, characterized in that: It also includes the leg extension and retraction device according to any one of claims 1 to 8, wherein the upper leg frame is pivotally connected to the frame.

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