A leg lifting angle amplification mechanism and its application in a massage chair

Abstract

This utility model discloses a leg lifting angle amplification mechanism and its application in a massage chair, including a base frame and a lifting member. The lifting member is driven by a drive device, which includes a telescopic member attached to the base frame in a reciprocating manner along a set direction, an angle amplification member pivotally connected to the telescopic member via a first pivot, an over-rotation limiting member pivotally connected to the angle amplification member via a second pivot, and the telescopic member pivotally connected to the over-rotation limiting member via a third pivot; a support member pivotally connected to the lifting member via a fourth pivot, and the over-rotation limiting member pivotally connected to the support member via a fifth pivot. The telescopic member actuates the lifting member through the angle amplification member, thereby increasing the rotation angle of the lifting member within the length limitation of the telescopic member. The telescopic member actuates the lifting member through the angle amplification member, increasing the rotation angle of the lifting member even within the length limitation of the telescopic member.

Description

Technical Field

[0001] This utility model relates to the technical field of leg-lifting mechanism devices, and in particular to a leg-lifting angle amplification mechanism and its application in a massage chair. Background Technology

[0002] In modern industry and daily life, leg lifting mechanisms are widely used in various equipment and scenarios, such as massage chairs, medical rehabilitation equipment, and adjustable furniture in smart homes. With continuous technological advancements and increasing demands for equipment performance and user experience, the requirements for leg lifting mechanisms in terms of lifting angle, motion stability, structural compactness, and control precision are becoming increasingly stringent. Traditional leg lifting mechanisms mostly employ simple linkage structures or direct hydraulic cylinder drives. However, these traditional methods have many limitations. For example, lifting mechanisms using simple linkage structures often have lifting angles limited by the length and layout of the linkages, making it difficult to achieve large angle changes and failing to meet the needs of applications with specific lifting angle requirements. While direct hydraulic cylinder drives can provide greater driving force, achieving large lifting angles requires a long stroke from the hydraulic cylinder. This not only increases the overall size of the mechanism, occupying more space, but also presents challenges in control precision, easily leading to inaccurate lifting angles and unstable movement.

[0003] Currently, massage chairs generally include a leg-lifting mechanism to relieve leg fatigue. This mechanism elevates the user's legs for massage, thus alleviating leg fatigue. However, existing leg-lifting mechanisms have the following drawbacks: the push rod is fixed inside the massage chair base. During the entire leg-lifting process, the push rod does not move together with the leg-lifting mechanism. This results in limited space for the push rod to move when the seat tilts gently, thus limiting the lifting angle of the leg-lifting structure. Consequently, it is impossible to achieve a large-angle leg lift through the leg-lifting mechanism to achieve the desired stretching and massage effect on the user's legs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a leg lifting angle amplification mechanism and a massage chair with the same application. By adopting a unique structure including telescopic components, angle amplification components, excessive rotation limiting components and support components, it realizes the function of increasing the rotation angle of the lifting component under the limitation of the length of the telescopic components.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A leg lifting angle amplification mechanism includes a base frame and a lifting member; the lifting member is driven by a driving device to rotate relative to the base frame to achieve a retracted / extended state, the driving device comprising:

[0007] A telescopic member is configured to be attached to the base frame in a manner that allows it to reciprocate in a predetermined direction;

[0008] An angle-enlarging component is pivotally connected to the telescopic component via a first rotating shaft;

[0009] An over-rotation limiting member is pivotally connected to the angle amplifying member via a second pivot, and the telescopic member is pivotally connected to the over-rotation limiting member via a third pivot; and

[0010] A support member is pivotally connected to the lifting member via a fourth pivot, and the excessive rotation limiting member is pivotally connected to the support member via a fifth pivot;

[0011] The telescopic member actuates the lifting member through an angle amplification component, thereby increasing the rotation angle of the lifting member within the length limitation of the telescopic member.

[0012] Furthermore, the angle magnifying member is configured to change the rotation angle magnification factor of the lifting member by changing its length.

[0013] Furthermore, the rotation angle magnification factor of the lifting member can be changed by altering the position of the telescopic member pivotally connected to the angle magnification member.

[0014] Furthermore, the sum of the distances between the first and second pivots and the distances between the second and fourth pivots is greater than the sum of the distances between the fourth and fifth pivots and the distances between the fourth and first pivots.

[0015] Furthermore, the first pivot is disposed in the middle of the lifting member.

[0016] Furthermore, the support member is fixed to the base frame.

[0017] Furthermore, the top of the lifting member has a mounting plate suitable for mounting the leg support.

[0018] Furthermore, the lifting member, angle amplification member, excessive rotation limiting member, and support member form a four-bar linkage structure.

[0019] Furthermore, the telescopic component is an electric push rod.

[0020] A massage chair, wherein the massage chair employs the aforementioned leg lifting angle amplification mechanism, and the massage chair further includes a seat frame and a back frame connected to the base frame.

[0021] Due to the adoption of the above technical solutions, this utility model has the following beneficial effects:

[0022] 1. In the leg lifting angle amplification mechanism of this utility model, the telescopic component actuates the lifting component through the angle amplification component. Even with the length limitation of the telescopic component, the rotation angle of the lifting component can be increased. This overcomes the problem of the limited leg lifting angle caused by the fixed push rod in the prior art, and can realize a large leg lifting angle to meet the user's needs for stretching and massaging the legs.

[0023] 2. The angle magnification component of this utility model can be configured to change the rotation angle magnification factor of the lifting component by changing its length. Users can flexibly adjust it according to actual needs to obtain a suitable leg-lifting angle. By changing the position of the telescopic component pivotally connected to the angle magnification component, the rotation angle magnification factor of the lifting component can also be changed, providing diversified adjustment methods and enhancing the adjustability and adaptability of the mechanism.

[0024] 3. In this utility model, the lifting component, angle amplification component, excessive rotation limiting component, and supporting component form a four-bar linkage structure. This structure makes the force transmission more rational. When the telescopic component moves back and forth, it can efficiently convert the telescopic motion into the rotational motion of the lifting component, further ensuring that the lifting component can obtain a larger rotation angle, compared with the traditional simple connection structure. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 2 This is an exploded view of the structure of this utility model in its folded state.

[0028] Figure 3 This is a structural diagram of the present invention in its unfolded state.

[0029] Figure 4 This is a three-dimensional structural diagram of the present invention in its unfolded state.

[0030] Figure 5 This is an exploded view of the structure of this utility model in its unfolded state.

[0031] Figure label:

[0032] In the figure, 100. Base frame; 200. Lifting component; 210. Mounting plate; 300. Drive device; 310. Telescopic component; 320. Angle magnification component; 330. Over-rotation limiting component; 340. Support component; 10. First rotating shaft; 20. Second rotating shaft; 30. Third rotating shaft; 40. Fourth rotating shaft; 50. Fifth rotating shaft. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0038] Example 1:

[0039] Please see Figures 1-5 This utility model discloses a leg lifting angle amplification mechanism, which is mainly used in massage chairs and other devices that need to achieve leg lifting function. Through a unique structural design, it increases the rotation angle of the lifting component 200 under the length limitation of the telescopic component 310, thereby achieving a greater lifting of the leg and providing users with a more effective leg stretching massage experience.

[0040] The leg lifting angle amplification mechanism includes a base frame 100 and a lifting member 200. The lifting member 200 is driven by a drive device 300 to rotate relative to the base frame 100 to achieve retracted and extended states. The drive device 300 is the key part of the mechanism, and it consists of a telescopic member 310, an angle amplification member 320, an over-rotation limiting member 330, and a support member 340. The components are pivotally connected by specific rotating shafts, forming a complex and efficient transmission system.

[0041] The base frame 100 serves as the fundamental support structure for the entire leg lifting angle amplification mechanism, and its shape and size are designed according to the specific application scenario. In this embodiment, the base frame 100 is made of robust metal material to ensure sufficient strength and stability. The base frame 100 is provided with multiple mounting holes and positioning structures for connecting and fixing to the various components of the drive device 300.

[0042] The lifting member 200 is a component for mounting a leg support (not shown), and its top has a mounting plate 210 suitable for mounting the leg support. The lifting member 200 is rotated relative to the base frame 100 by a drive device 300. A first pivot 10 is disposed in the middle of the lifting member 200 for pivotal connection with the angle magnification member 320. In addition, the lifting member 200 is also pivotally connected to the support member 340 via a fourth pivot 40.

[0043] The telescopic component 310 employs an electric actuator, configured to reciprocate in a set direction and attach to the base frame 100. The electric actuator offers advantages such as simple structure, convenient control, and adjustable stroke, enabling precise control of the rotation angle of the lifting component 200 according to actual needs. The electric actuator is pivotally connected to the over-rotation limiting component 330 via a third pivot 30, thereby converting its telescopic motion into the rotational motion of the lifting component 200.

[0044] Angle magnifying member 320 is pivotally connected to lifting member 200 via first rotating shaft 10. The function of angle magnifying member 320 is to amplify the stroke of telescopic member 310, thereby increasing the rotation angle of lifting member 200. In this embodiment, angle magnifying member 320 is configured to change the magnification factor of the rotation angle of lifting member 200 by changing its length. Specifically, this can be achieved by providing an adjustable-length structure on angle magnifying member 320, such as a telescopic sleeve structure, where the overall length of angle magnifying member 320 is changed by adjusting the relative position of the sleeve.

[0045] The over-rotation limiting member 330 is pivotally connected to the angle amplifying member 320 via the second pivot 20, and simultaneously pivotally connected to the telescopic member 310 via the third pivot 30. The main function of the over-rotation limiting member 330 is to limit the excessive rotation of the lifting member 200, preventing over-rotation during the lifting process. When the lifting member 200 rotates to a certain angle, the over-rotation limiting member 330 will contact the angle amplifying member 320 or the supporting member 340, thereby preventing the lifting member 200 from continuing to rotate.

[0046] The support member 340 is pivotally connected to the lifting member 200 via the fourth pivot 40, and simultaneously pivotally connected to the over-rotation limiting member 330 via the fifth pivot 50. The support member 340 is fixed to the base frame 100, providing stable support for the entire drive unit 300. The shape and dimensions of the support member 340 are designed according to its stress conditions to ensure that it can withstand sufficient force during lifting without deformation or damage.

[0047] The lifting member 200, the angle amplification member 320, the over-rotation limiting member 330, and the supporting member 340 form a four-bar linkage. The four-bar linkage is suitable for low-speed transmission mechanisms and has the following advantages:

[0048] Improved stability of the drive unit: The four-bar linkage structure enables smoother movement between components, reducing impact and vibration during movement, thereby improving the stability and reliability of the drive unit 300.

[0049] Achieving a large-angle lift: Through the motion characteristics of the four-bar linkage, the lifting component 200 can swing and lift to the outer front side of the base frame 100 under the push of the telescopic component 310, thereby raising the leg rest to be coaxial with the massage chair, so that the user's legs are resting between the base frame 100 and the back frame (not shown in the figure) and tend to be in a straight line, so as to stretch and massage the user's legs, soothe muscles, and relieve fatigue.

[0050] The base frame adapts to different tilt angles: the four-bar structure can slowly raise the leg rest. The telescopic component 310 is hinged to the four-bar structure, which allows the telescopic component 310 and the four-bar structure to swing together to the outside of the seat frame during the lifting process. This allows the leg rest to be raised at a large angle even when the tilt angle of the base frame 100 is relatively gentle, until it is almost coaxial with the base frame 100, thus achieving the effect of stretching and massaging the user's legs.

[0051] The sum of the distances between the first pivot 10 and the second pivot 20 and the fourth pivot 40 is greater than the sum of the distances between the fourth pivot 40 and the fifth pivot 50 and the fourth pivot 40 and the first pivot 10. This dimensional relationship is carefully designed to ensure that the four-bar linkage has good transmission characteristics and stability during operation.

[0052] The first pivot 10 is positioned in the middle of the lifting member 200, a design that increases overall stability. When the lifting member 200 is subjected to external forces, the central support enables the force to be distributed more evenly, reducing deformation or damage caused by excessive local stress.

[0053] Besides changing the length of the angle magnifying member 320 to change the rotation angle magnification factor of the lifting member 200, it can also be achieved by changing the position where the telescopic member 310 is pivotally connected to the angle magnifying member 320. For example, multiple different pivot positions can be provided on the angle magnifying member 320. By selecting different pivot positions, the lever arm of the telescopic member 310 on the angle magnifying member 320 can be changed, thereby changing the rotation angle magnification factor of the lifting member 200.

[0054] The lifting component 200 is detachably connected to the rear of the leg support, which can be achieved through existing connection methods such as screws or snap-fits. This detachable design facilitates the installation, replacement, and cleaning of the leg support. When the leg support is damaged or needs to be replaced with a different style, simply remove the leg support from the lifting component 200 and install the new leg support.

[0055] The massage chair in this embodiment employs the aforementioned leg-lifting angle amplification mechanism. The massage chair also includes a seat frame and a back frame connected to the base frame 100. The seat frame provides hip and back support for the user, and combined with the leg-lifting function, provides a comprehensive massage experience. The overall structure of the massage chair can be customized according to different application scenarios and user needs, such as adjusting the tilt angle of the back frame or adding massage function modules.

[0056] Working principle

[0057] When the legs need to be raised, the electric push rod extends, pushing the over-rotation limiting member 330 to rotate around the second pivot 20. The movement of the over-rotation limiting member 330 causes the angle amplifying member 320 to rotate around the first pivot 10. Simultaneously, since the support member 340 is fixed to the base frame 100, the lifting member 200 also begins to rotate around the fourth pivot 40 under the action of the angle amplifying member 320. During the rotation, the four-bar linkage comes into play, causing the lifting member 200 to gradually swing upward, raising the leg rest to a position close to coaxial with the massage chair. When the legs need to be lowered, the electric push rod retracts, and the components move in the opposite order, causing the lifting member 200 to gradually return to its initial position, and the leg rest is lowered accordingly.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A leg lifting angle amplification mechanism, comprising a base frame and a lifting component; The lifting component is driven by a drive device to rotate relative to the base frame to achieve a retracted / expanded state, characterized in that... The driving device includes: A telescopic member is configured to be attached to the base frame in a manner that allows it to reciprocate in a predetermined direction; An angle-enlarging component is pivotally connected to the telescopic component via a first rotating shaft; An over-rotation limiting member is pivotally connected to the angle amplifying member via a second pivot, and the telescopic member is pivotally connected to the over-rotation limiting member via a third pivot; and A support member is pivotally connected to the lifting member via a fourth pivot, and the excessive rotation limiting member is pivotally connected to the support member via a fifth pivot; The telescopic member actuates the lifting member through an angle amplification component, thereby increasing the rotation angle of the lifting member within the length limitation of the telescopic member.

2. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The angle magnifying member is configured to change the rotation angle magnification factor of the lifting member by changing its length.

3. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The rotation angle magnification factor of the lifting member can be changed by altering the position of the telescopic member pivotally connected to the angle magnification member.

4. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The sum of the distances between the first and second pivots and the distances between the second and fourth pivots is greater than the sum of the distances between the fourth and fifth pivots and the distances between the fourth and first pivots.

5. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The first pivot is located in the middle of the lifting member.

6. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The support member is fixed to the base frame.

7. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The top of the lifting member has a mounting plate suitable for mounting the leg support.

8. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The lifting component, angle amplification component, excessive rotation limiting component, and support component form a four-bar linkage structure.

9. The leg lifting angle amplification mechanism according to claim 1, characterized in that, The telescopic component is an electric push rod.

10. A massage chair, characterized in that, The massage chair includes a leg lifting angle amplification mechanism as described in any one of claims 1 to 9, and the massage chair also includes a seat frame and a back frame connected to the base frame.

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