Single-motor leg support mechanism capable of acting in four directions

Abstract

The utility model provides a four-direction actuating single-motor leg support mechanism, which belongs to the technical field of leg supports and comprises a driver, a fixing frame, a leg support inner frame and a leg support outer frame, the fixing frame is used for being connected with a seat cushion of a seat, the leg support outer frame is slidably arranged relative to the leg support inner frame, a transmission mechanism is arranged between the fixing frame and the leg support inner frame, and the transmission mechanism is connected with the driver. A connecting rod mechanism is arranged between the transmission mechanism and the leg support outer frame, the transmission mechanism is driven by a driver to achieve adjustment of the angle and the height of the leg support inner frame, and the connecting rod mechanism is used for enabling the leg support outer frame to synchronously stretch out and draw back relative to the leg support inner frame while the angle and the height of the leg support inner frame are adjusted. A single driver is used for replacing traditional double driving sources, system complexity and manufacturing cost are remarkably reduced, meanwhile, automatic synchronization of leg support angle / height adjustment and leg support outer frame stretching and retracting is achieved through mechanical linkage design, and the defect that step-by-step control or programming intervention is needed in a traditional scheme is overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to leg support technical field, concretely relates to four -way actuation's single motor leg support mechanism. BACKGROUND

[0002] With the development of automobile industry, the requirement of consumer to automobile comfort is higher and higher, especially in long distance driving and daily commuting, the comfort degree of seat directly influences the experience of passenger. The seat leg support as the important accessory of promoting the comfort degree of seat, its design and material selection gradually are valued.

[0003] The leg support mechanism in prior art can satisfy the function of four -way adjustment, but as needing to match two driving sources, one is used for adjusting the angle and height of leg support, the other is used for adjusting the length of leg support, therefore the cost is higher, the overall weight of leg support mechanism is larger, cannot be adapted to many light weight vehicles, and four -way leg support needs the post -programming when leg support is lifted to a certain angle and can be stretched out. UTILITY MODEL CONTENT

[0004] The utility model aims at overcoming the shortcomings and deficiencies of prior art, and provides four -way actuation's single motor leg support mechanism.

[0005] The utility model adopts the technical scheme as follows: the application provides four -way actuation's single motor leg support mechanism, including driver, fixed frame, leg support inner frame and leg support outer frame, the fixed frame is used for and the seat cushion is connected, the leg support outer frame is relative leg support inner frame sliding arrangement, be provided with transmission mechanism between the fixed frame and leg support inner frame, the connecting rod mechanism between transmission mechanism and leg support outer frame, realize the adjustment of leg support inner frame angle and height through one driver drive transmission mechanism, the connecting rod mechanism is used for in the angle and height adjustment of leg support inner frame, simultaneously, make leg support outer frame relative leg support inner frame carry out synchronous telescopic action.

[0006] In some embodiments, the transmission mechanism includes a drive rod and a linkage assembly disposed on both sides of the drive rod, the linkage assembly includes a first linkage plate, a second linkage plate, a first connecting plate and a second connecting plate, one end of the first linkage plate is hinged to the fixed frame, one end of the second linkage plate is hinged to the other end of the first linkage plate, and the other end thereof is hinged to the leg support inner frame, one end of the first connecting plate is hinged to the fixed frame, one end of the second connecting plate is hinged to the other end of the first connecting plate, the middle part thereof is hinged to the middle part of the first linkage plate, and the other end thereof is hinged to the leg support inner frame.

[0007] In some embodiments, the hinged point of the second connecting plate relative to the hinged point of the second linkage plate and the leg support inner frame is close to the first end of the leg support inner frame.

[0008] In some embodiments, the connecting rod mechanism comprises a four-bar linkage assembly and a fixed connecting rod, the four-bar linkage assembly comprises connecting rod one, connecting rod two, connecting rod three and connecting rod four, two ends of the connecting rod one are hingedly connected with one end of the connecting rod two and one end of the connecting rod three, the other end of the connecting rod two and the other end of the connecting rod three are hingedly connected with the connecting rod four, one end of the fixed connecting rod is hingedly connected with the connecting rod four, and the other end of the fixed connecting rod is fixed with the leg support outer frame.

[0009] In some embodiments, the second connecting plate is provided with a first limiting plate part and a second limiting plate part, the second linkage plate is provided with a third limiting plate part, the four-way leg support mechanism has a retracted posture and an expanded posture, when it is in the retracted posture, the first limiting plate part and the third limiting plate part abut, and when it is in the expanded posture, the second limiting plate part and the third limiting plate part abut.

[0010] In some embodiments, the leg support inner frame is provided with a fixed seat on both sides, the fixed seat is provided with a sliding sleeve, the connecting rod is slidably arranged in the sliding sleeve, and one end of the connecting rod is fixed with the leg support outer frame.

[0011] In some embodiments, the connecting rod is in a U shape, one end of the connecting rod is slidably arranged in the sliding sleeve, the other end of the connecting rod is fixed with the leg support outer frame, and the length of the fixed part of the connecting rod with the leg support outer frame is greater than one half of the length of the leg support outer frame.

[0012] In some embodiments, the sliding sleeve comprises a sleeve part and a disc part, the fixed seat is provided with a mounting channel, the sleeve part is provided with an elastic clamping block at one end close to the fixed frame, the other end of the sleeve part is provided with a limiting protrusion, the elastic clamping block is provided with an inclined surface, the sleeve part is inserted into the mounting channel to form clamping, the disc part is arranged at one end of the sleeve part away from the fixed frame, and the sleeve part and the disc part are provided with smooth channels for the sliding of the connecting rod.

[0013] In some embodiments, the driver is an electric push rod, and the driving rod of the electric push rod is hingedly connected with a driving plate.

[0014] In some embodiments, the first limiting plate part is arranged between the hinged joint of the second connecting plate and the first connecting plate and the hinged joint of the second connecting plate and the first linkage plate, the second limiting plate part is arranged between the hinged joint of the second connecting plate and the first linkage plate and the hinged joint of the second connecting plate and the leg support inner frame, and the third limiting plate part is arranged at one end of the second linkage plate close to the first linkage plate.

[0015] The utility model discloses the following beneficial effects: in the utility model, a single driver is used to replace the traditional double driving source, which significantly reduces the system complexity and manufacturing cost, and through the mechanical linkage design, the automatic synchronization of leg support angle / height adjustment and leg support outer frame extension is realized, and the defects of step-by-step control or programming intervention in the traditional scheme are eliminated. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this 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 this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a schematic diagram of the four-way actuation single-motor leg support mechanism of this utility model when it is unfolded;

[0018] Figure 2 This is a cross-sectional view of the four-way actuated single-motor leg support mechanism of this utility model when unfolded. Figure One ;

[0019] Figure 3 This is a cross-sectional view of the four-way actuated single-motor leg support mechanism of this utility model when unfolded. Figure Two ;

[0020] Figure 4 This is a partial schematic diagram of the retraction of the four-way actuated single-motor leg support mechanism in this utility model;

[0021] Figure 5 This is a schematic diagram of the retraction of the four-way actuating single-motor leg support mechanism in this utility model.

[0022] Figure 6 This is a cross-sectional view of the four-way actuated single-motor leg support mechanism of this utility model when it is retracted.

[0023] Figure 7 This is a schematic diagram of the fixed base, sliding sleeve, and connecting rod in this utility model. Detailed Implementation

[0024] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Secondly, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral constructions; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0028] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0030] like Figures 1 to 7 As shown in the figure, this specification provides a four-way actuated single-motor leg support mechanism, including a driver 1, a fixed frame 2, an inner leg support frame 3, and an outer leg support frame 4. The fixed frame 2 is used to connect with the seat cushion. The outer leg support frame 4 is slidably arranged relative to the inner leg support frame 3. A transmission mechanism is provided between the fixed frame 2 and the inner leg support frame 3. A linkage mechanism is connected between the transmission mechanism and the outer leg support frame 4. The driver 1 drives the transmission mechanism to realize the adjustment of the angle and height of the inner leg support frame 3. The linkage mechanism is used to make the outer leg support frame 4 perform synchronous extension and retraction relative to the inner leg support frame 3 while the angle and height of the inner leg support frame 3 are adjusted. The four-way adjustment function is realized through the coordinated design of the driver 1, the fixed frame 2, the inner leg support frame 3, and the outer leg support frame 4. Specifically, the power output by the driver 1 is converted into the rotation and lifting action of the inner leg support frame 3 through the transmission mechanism in the fixed frame 2. At the same time, the motion trajectory of the inner leg support frame 3 is coupled to the extension and retraction action of the outer leg support frame 4 through a specific linkage mechanism.

[0031] In this way, the single driver 1 is used to replace the traditional double drive source, which significantly reduces the system complexity and manufacturing cost, and through the mechanical linkage design, the automatic synchronization of the leg support angle / height adjustment and the extension of the leg support outer frame 4 is realized, eliminating the defects of step-by-step control or programming intervention in the traditional scheme. In addition, the transmission path between the fixed frame 2 and the leg support inner frame 3 is optimized, which ensures the adjustment accuracy while reducing the overall structure weight.

[0032] In some embodiments, the transmission mechanism includes a drive rod 5 and linkage assemblies arranged on both sides of the drive rod 5, the linkage assemblies including a first linkage plate 6, a second linkage plate 7, a first connecting plate 8 and a second connecting plate 9. One end of the first linkage plate 6 is hinged to the fixed frame 2 to form a hinge point one. One end of the second linkage plate 7 is hinged to the other end of the first linkage plate 6 to form a hinge point two. The other end of the second linkage plate 7 is hinged to the leg support inner frame 3 to form a hinge point three. One end of the first connecting plate 8 is hinged to the fixed frame 2 to form a hinge point four. One end of the second connecting plate 9 and the other end of the first connecting plate 8 are hinged to form a hinge point five. The middle part of the second connecting plate 9 and the middle part of the first linkage plate 6 are hinged to form a hinge point six. The other end of the second connecting plate 9 and the leg support inner frame 3 are hinged to form a hinge point seven.

[0033] In this way, the movement of the drive rod 5 is converted into the compound movement of the leg support inner frame 3 through the linkage assemblies symmetrically distributed on both sides, so that the extension amount of the leg support outer frame 4 and the rotation angle of the inner frame 3 automatically maintain a predetermined ratio, eliminating the timing error of the extension and rotation action in the traditional scheme. At the same time, the parallelogram mechanism formed by the first connecting plate 8 and the second connecting plate 9 continuously provides lateral restraint force during movement, effectively inhibiting the lateral deviation of the leg support inner frame 3, improving the uniformity of load distribution of the overall structure, and still maintaining good angle control accuracy under extreme working conditions.

[0034] Preferably, the hinge point of the second connecting plate 9 and the leg support inner frame 3 is closer to the head end of the leg support inner frame 3 than the hinge point of the second linkage plate 7 and the leg support inner frame 3, i.e. the hinge point seven is closer to the head end of the leg support inner frame 3 than the hinge point three, and the head end of the leg support inner frame 3 is the end close to the fixed frame 2. Among them, the distance from the hinge point six to the hinge point seven is less than the distance from the hinge point seven to the hinge point three.

[0035] In this way, a two-point motion control structure is formed, which first drives the leg support head end to move quickly through the short force arm to form a good support, and then controls the overall rotation angle through the long force arm, so that the head end is preferentially moved forward when the leg support is unfolded, avoiding the risk of interference between the foot and the interior part, and ensuring that the leg support curve always fits the physiological curvature of the human calf, improving the comfort of the user during the ride.

[0036] In some embodiments, the connecting rod mechanism comprises a four-bar linkage assembly and a fixed connecting rod 10, the four-bar linkage assembly comprises connecting rod one 11, connecting rod two 12, connecting rod three 13 and connecting rod four 14, both ends of the connecting rod one 11 are hingedly connected with one end of the connecting rod two 12 and one end of the connecting rod three 13, the other end of the connecting rod two 12 and the other end of the connecting rod three 13 are hingedly connected to the connecting rod four 14, one end of the fixed connecting rod 10 is hingedly connected with the connecting rod four 14, and the other end is fixed with the leg support outer frame 4. The basic motion chain formed by the four-bar linkage assembly is converted into the translational motion of the leg support outer frame 4 through the secondary hinging of the connecting rod four 14 and the fixed connecting rod 10, so as to accurately control the stretching trajectory and stretching amount of the leg support outer frame 4 and ensure the synchronization of the motion.

[0037] In some embodiments, the second connecting plate 9 is provided with a first limiting plate part 15 and a second limiting plate part 16, and the second linkage plate 7 is provided with a third limiting plate part 17. The four-way leg support mechanism has a retracted posture and an expanded posture. When it is in the retracted posture, the first limiting plate part 15 and the third limiting plate part 17 abut against each other, so as to avoid interference or wear of internal parts due to misplacement.

[0038] When it is in the expanded posture, the second limiting plate part 16 and the third limiting plate part 17 abut against each other, so as to accurately control the stretching limit of the leg support and ensure that the user does not exceed the design range during use, thereby improving safety.

[0039] In this way, the accurate termination position of the mechanism motion is ensured through the physical contact point, the safety, reliability and durability are improved, and the control system is simplified and the cost is reduced.

[0040] Specifically, the first limiting plate part 15 is arranged between the hinging point of the second connecting plate 9 and the first connecting plate 8 and the hinging point of the second connecting plate 9 and the first linkage plate 6, the second limiting plate part 16 is arranged between the hinging point of the second connecting plate 9 and the first linkage plate 6 and the hinging point of the second connecting plate 9 and the leg support inner frame 3, and the third limiting plate part 17 is arranged at one end of the second linkage plate 7 close to the first linkage plate 6.

[0041] In some embodiments, the leg support inner frame 3 is provided with a fixed seat 18 on both sides, the fixed seat 18 is generally formed by bending a metal plate, a sliding sleeve 19 is arranged in the fixed seat 18, a connecting rod 20 is slidably arranged in the sliding sleeve 19, and one end of the connecting rod 20 is fixed with the leg support outer frame 4. The sliding sleeve 19 can be made of engineering plastic, but it must have high wear resistance and high strength while maintaining elasticity.

[0042] The connecting rod 20 is in U shape, one end of which is slidingly arranged in the sliding sleeve 19, and the other end is fixed with the leg support outer frame 4, and the length of the fixed part with the leg support outer frame 4 is greater than half of the length of the leg support outer frame 4, which increases the contact length with the leg support outer frame 4, improves the stability, reduces the bending stress, and disperses the load.

[0043] The sliding sleeve 19 comprises a sleeve part 190 and a disc part 191, the outer diameter of the disc part 191 is greater than that of the sleeve part 190, which enhances the support area of the sliding sleeve 19, prevents the sleeve part 190 from deforming under load, and ensures the straight-line movement of the connecting rod 20. The fixing seat 18 is provided with a mounting channel 180, the sleeve part 190 is provided with an elastic clamping block 192 at one end close to the fixed frame 2, and is provided with a limiting protrusion 193 at the other end, the elastic clamping block 192 is provided with an inclined surface 194, the sleeve part 190 is inserted into the mounting channel 180 to form a clamping connection, which simplifies the installation process, the inclined surface of the elastic clamping block facilitates the insertion into the mounting channel, the clamping structure reduces the need for screws or welding, and the assembly cost is reduced. The disc part 191 is arranged at one end of the sleeve part 190 away from the fixed frame 2, and the sleeve part 190 and the disc part 191 are provided with smooth channels for the sliding of the connecting rod 20, which reduces friction, prolongs the service life, and ensures smooth sliding.

[0044] In some embodiments, the driver 1 adopts an electric push rod, the driving rod 5 of which is hinged with a driving plate 21 at the end, the driving plate 21 is connected with the driving rod 5, and the movement direction is adjusted through the driving plate 21 to avoid the stress concentration problem caused by rigid connection.

[0045] In summary, after reading the detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure can be presented only in an exemplary manner, and can not be limiting. Although it is not explicitly stated here, those skilled in the art can understand that the present application requires to cover various reasonable changes, improvements and modifications of the embodiments. These changes, improvements and modifications are intended to be proposed by the present application, and are within the spirit and scope of the exemplary embodiments of the present application.

[0046] In addition, it should be understood that in the foregoing description of the embodiments of the present application, for the purpose of helping to understand one feature, the present application combines various features in a single embodiment, figure or its description for the purpose of simplifying the present application. However, this does not mean that the combination of these features is necessary, and those skilled in the art can certainly mark out part of the device as a separate embodiment when reading the present application. That is, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. And the content of each secondary embodiment is also true when there are less than all the features of a single foregoing disclosed embodiment.

[0047] Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the present application. Other modifications that are obvious within the spirit and principles of the application are encompassed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application. Those of skill in the art could readily devise their own modifications to the specific embodiments disclosed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application.

Claims

1. A single motor leg rest mechanism actuated in four directions, characterized in that, The four-way leg rest mechanism comprises a driver, a fixed frame, a leg rest inner frame and a leg rest outer frame, the fixed frame is used to be connected with a seat cushion, the leg rest outer frame is arranged to slide relative to the leg rest inner frame, a transmission mechanism is arranged between the fixed frame and the leg rest inner frame, a connecting rod mechanism is arranged between the transmission mechanism and the leg rest outer frame, the angle and height of the leg rest inner frame are adjusted by driving the transmission mechanism through a driver, and the connecting rod mechanism is used to make the leg rest outer frame perform synchronous extension and contraction relative to the leg rest inner frame when the angle and height of the leg rest inner frame are adjusted.

2. The four-way actuated single motor leg rest mechanism of claim 1, wherein, The transmission mechanism comprises a driving rod and linkage assemblies arranged on both sides of the driving rod, the linkage assemblies comprise a first linkage plate, a second linkage plate, a first connecting plate and a second connecting plate, one end of the first linkage plate is hinged to the fixed frame, one end of the second linkage plate is hinged to the other end of the first linkage plate, and the other end of the second linkage plate is hinged to the leg rest inner frame, one end of the first connecting plate is hinged to the fixed frame, one end of the second connecting plate is hinged to the other end of the first connecting plate, the middle part of the second connecting plate is hinged to the middle part of the first linkage plate, and the other end of the second connecting plate is hinged to the leg rest inner frame.

3. The four-way actuated mono-motor leg rest mechanism of claim 2, wherein, The hinged point of the second connecting plate relative to the leg rest inner frame is close to the first end of the leg rest inner frame.

4. The four-way actuated mono-motor leg rest mechanism of claim 2, wherein, The connecting rod mechanism comprises a four-bar linkage assembly and a fixed connecting rod, the four-bar linkage assembly comprises a connecting rod one, a connecting rod two, a connecting rod three and a connecting rod four, both ends of the connecting rod one are hinged to one end of the connecting rod two and one end of the connecting rod three, the other end of the connecting rod two and the other end of the connecting rod three are hinged to the connecting rod four, one end of the fixed connecting rod is hinged to the connecting rod four, and the other end of the fixed connecting rod is fixed to the leg rest outer frame.

5. The four-way actuated mono-motor leg rest mechanism according to claim 2 or 4, wherein, The second connecting plate is provided with a first limiting plate part and a second limiting plate part, the second linkage plate is provided with a third limiting plate part, the four-way leg rest mechanism has a contraction posture and an expansion posture, when the four-way leg rest mechanism is in the contraction posture, the first limiting plate part and the third limiting plate part abut against each other, and when the four-way leg rest mechanism is in the expansion posture, the second limiting plate part and the third limiting plate part abut against each other.

6. The four-way actuated mono-motor leg rest mechanism of claim 1, wherein, Both sides of the leg rest inner frame are provided with fixed seats, sliding sleeves are arranged in the fixed seats, connecting rods are arranged to slide in the sliding sleeves, and one end of each connecting rod is fixed to the leg rest outer frame.

7. The four-way actuated mono-motor leg rest mechanism of claim 6, wherein, The connecting rod is in a U shape, one end of the connecting rod is arranged to slide in the sliding sleeve, the other end of the connecting rod is fixed to the leg rest outer frame, and the length of the part of the connecting rod fixed to the leg rest outer frame is greater than one half of the length of the leg rest outer frame.

8. The four-way actuated mono-motor leg rest mechanism of claim 7, wherein, The sliding sleeve comprises a sleeve part and a disc part, the fixed seat is provided with a mounting channel, one end of the sleeve part close to the fixed frame is provided with an elastic clamping block, the other end of the sleeve part is provided with a limiting protrusion, an inclined surface is arranged on the elastic clamping block, the sleeve part is inserted into the mounting channel to form clamping, the disc part is arranged at the end of the sleeve part away from the fixed frame, and smooth channels for the connecting rods to slide are arranged in the sleeve part and the disc part.

9. The four-way actuated mono-motor leg rest mechanism of claim 1, wherein, The driver is an electric push rod, and a driving plate is hinged to the end of the driving rod of the electric push rod, and the driving plate is connected with the driving rod.

10. The four-way actuated mono-motor leg rest mechanism of claim 5, wherein, The first limiting plate part is arranged between the hinge joint of the second connecting plate and the first connecting plate and the hinge joint of the second connecting plate and the first linkage plate, the second limiting plate part is arranged between the hinge joint of the second connecting plate and the first linkage plate and the hinge joint of the second connecting plate and the inner frame of the leg support, and the third limiting plate part is arranged at one end of the second linkage plate close to the first linkage plate.

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