A leg support linkage mechanism

Abstract

The present invention discloses a leg rest linkage mechanism, which includes a seat cushion body, a seat cushion fixing plate, a leg rest skeleton, an electric push rod and a first connecting rod. The seat cushion fixing plate is installed on the lower surface of the seat cushion body. The lower end of the seat cushion fixing plate is hinged to one end of the first connecting rod, and the other end of the first connecting rod is hinged to the leg rest skeleton. The fixed end of the electric push rod is hinged to the lower surface of the seat cushion body, and the telescopic end of the electric push rod is hinged to the lower surface of the leg rest skeleton. The achieved technical effect is that: through the leg rest linkage mechanism of the present invention, only one electric push rod is required to lift the leg rest and extend the leg rest, significantly improving the work efficiency. The number of leg rest connecting rods is less than that of the existing products on the market (which can be completely hidden under the seat cushion during storage), significantly reducing the processing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of seat accessories, and particularly to a leg rest linkage mechanism. Background Art

[0002] With the continuous improvement of people's living standards, the requirements for the comfort of seats are getting higher and higher, and the functions of seats are also becoming more diverse. In order to improve the comfort of seats, many seats have a leg rest function. When a user is sitting, the leg rest can raise the user's calves, providing a certain support for the calves and improving the user's comfort experience.

[0003] Currently, the basic functions of leg rest devices on the market are as follows: When needed, the leg rest can extend out of the seat cushion or flip up from below the seat cushion to support the calves. Some leg rests can also extend a certain distance independently to accommodate users with different calf lengths and increase the comfort of use for users.

[0004] However, there are also some disadvantages in the leg rests on the market:

[0005] 1. The raising and extension of the leg rest need to be manually adjusted, resulting in a poor user experience.

[0006] 2. Electrically controlling the raising and extension of the leg rest requires more than two motors, resulting in a high manufacturing cost.

[0007] 3. Some leg rests move around a rotation center when flipping, so there may be interference with the seat cushion when raising. To avoid interference between the leg rest and the seat cushion, the leg rest protrudes from the seat cushion when retracted, resulting in poor comfort.

[0008] In order to avoid the situation in point 3, some leg rests are designed with several connecting rods, enabling the leg rest to bypass the front end of the seat cushion by itself when raising, but the number of connecting rods is relatively large, resulting in a high manufacturing cost. Summary of the Invention

[0009] Therefore, the present invention provides a leg rest linkage mechanism to solve the above problems in the prior art.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] According to a first aspect of the present invention, a leg rest linkage mechanism includes a seat cushion body, a seat cushion fixing plate, a leg rest frame, an electric push rod, and a first connecting rod. The lower surface of the seat cushion body is provided with the seat cushion fixing plate. The lower end of the seat cushion fixing plate is hinged to one end of the first connecting rod, and the other end of the first connecting rod is hinged to the leg rest frame. The fixed end of the electric push rod is hinged to the lower surface of the seat cushion body, and the telescopic end of the electric push rod is hinged to the lower surface of the leg rest frame.

[0012] Further, it further includes a second connecting rod, one end of the second connecting rod is hinged to the lower end of the seat cushion fixing plate, the other end of the second connecting rod is hinged to the leg rest frame, and the second connecting rod is located on the front side of the first connecting rod.

[0013] Further, it further includes a leg rest extension frame and a third connecting rod. The leg rest extension frame is slidably connected to the lower surface of the leg rest frame. One end of the third connecting rod is hinged to the lower end of the seat cushion fixing plate, and the other end of the third connecting rod is hinged to the lower surface of the leg rest extension frame.

[0014] Further, it further includes a stepped bolt and a nut. A strip-shaped hole is formed in the leg rest frame. The stepped bolt passes through the leg rest extension frame and is inserted into the strip-shaped hole, and the nut is threadedly connected to the stepped bolt.

[0015] Further, the leg rest extension frame is slidably abutted against the lower surface of the leg rest frame.

[0016] Further, the strip-shaped hole extends along the length direction of the leg rest frame.

[0017] Further, it further includes a first bracket and a second bracket. The first bracket is installed on the lower surface of the seat cushion body, and the second bracket is installed on the lower surface of the leg rest frame. The fixed end of the electric push rod is hinged inside the first bracket, and the telescopic end of the electric push rod is hinged inside the second bracket.

[0018] Further, the structures of the first bracket and the second bracket are exactly the same, and both the first bracket and the second bracket are U-shaped bent plate-like structures.

[0019] Further, a notch is formed at the rear edge of the leg rest extension frame. When the leg rest extension frame coincides with the leg rest frame, the second bracket is located inside the notch.

[0020] Further, there are two groups of seat cushion fixing plates. The electric push rod is arranged at the central symmetry plane of the lower surface of the seat cushion body, and the two groups of seat cushion fixing plates are symmetrically arranged with respect to the electric push rod.

[0021] Further, the radius of the running track line at the vertex of the leg rest frame close to the seat cushion body is smaller than the distance between the rotation center point of the leg rest frame and the nearest point of the seat cushion body.

[0022] The present invention has the following advantages: Through a leg rest linkage mechanism of the present invention, only one electric push rod is required to lift the leg rest and extend the leg rest, and the working efficiency is significantly improved. The number of leg rest connecting rods is less than that of existing products in the market (which can be completely hidden under the seat cushion during storage), and the processing cost is significantly reduced. Description of the Drawings

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained by extending according to the provided drawings.

[0024] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0025] Figure 1 The perspective view of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0026] Figure 2 The exploded view of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0027] Figure 3 The partial plan view of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0028] Figure 4 The perspective view of the retracted state of the leg rest of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0029] Figure 5 The plan view of the retracted state of the leg rest of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0030] Figure 6 The perspective view of the deployed state of the leg rest of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0031] Figure 7 The plan view of the deployed state of the leg rest of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0032] Figure 8 The side view of a leg rest linkage mechanism provided by some embodiments of the present invention.

[0033] In the figure: 1, seat cushion body; 2, seat cushion fixing plate; 3, leg rest skeleton; 4, leg rest extension skeleton; 5, electric push rod; 6, first bracket; 7, second bracket; 8, first connecting rod; 9, second connecting rod; 10, third connecting rod; 11, stepped bolt; 12, nut; 13, elongated hole. Detailed implementation manners

[0034] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] As Figures 1 to 8 shown, a leg rest linkage mechanism in an embodiment of the first aspect of the present invention includes a seat cushion body 1, a seat cushion fixing plate 2, a leg rest skeleton 3, an electric push rod 5, and a first connecting rod 8. The lower surface of the seat cushion body 1 is provided with the seat cushion fixing plate 2. The lower end of the seat cushion fixing plate 2 is hinged to one end of the first connecting rod 8, and the other end of the first connecting rod 8 is hinged to the leg rest skeleton 3. The fixed end of the electric push rod 5 is hinged to the lower surface of the seat cushion body 1, and the telescopic end of the electric push rod 5 is hinged to the lower surface of the leg rest skeleton 3.

[0036] In the above embodiment, it should be noted that the electric push rod 5 in the above embodiment is a mature electric push rod structure driven by a motor for telescoping in the prior art.

[0037] The technical effects achieved by the above embodiment are as follows: Through a leg rest linkage mechanism of this embodiment, only one electric push rod is required to lift the leg rest and extend the leg rest, significantly improving the work efficiency. The number of leg rest connecting rods is less than that of existing products in the market that can be completely hidden under the seat cushion during storage, significantly reducing the processing cost.

[0038] Optionally, as Figures 1 to 8 shown, in some embodiments, a second connecting rod 9 is further included. One end of the second connecting rod 9 is hinged to the lower end of the seat cushion fixing plate 2, and the other end of the second connecting rod 9 is hinged to the leg rest skeleton 3. The second connecting rod 9 is located in front of the first connecting rod 8.

[0039] In the above optional embodiment, it should be noted that the hinge joint of the first connecting rod 8 and the seat cushion fixing plate 2 is located between the hinge joint of the second connecting rod 9 and the seat cushion fixing plate 2 and the connection joint of the seat cushion fixing plate 2 and the seat cushion body 1, that is, the first connecting rod 8 is hinged in the middle of the seat cushion fixing plate 2.

[0040] The beneficial effects of the above optional embodiment are as follows: Through the transmission mode of the first connecting rod 8 cooperating with the second connecting rod 9, the stability of the leg rest skeleton 3 when retracting and unfolding is significantly improved.

[0041] Optionally, as Figures 1 to 8As shown, in some embodiments, it further includes a leg rest extension skeleton 4 and a third connecting rod 10. The leg rest extension skeleton 4 is slidably connected to the lower surface of the leg rest skeleton 3. One end of the third connecting rod 10 is hinged to the lower end of the seat cushion fixing plate 2, and the other end of the third connecting rod 10 is hinged to the lower surface of the leg rest extension skeleton 4.

[0042] In the above optional embodiments, it should be noted that a part of the third connecting rod 10 and the second connecting rod 9 are in a coincident state.

[0043] The beneficial effect of the above optional embodiments is that by providing the leg rest extension skeleton 4 and the third connecting rod 10, under the drive of the third connecting rod 10, the leg rest extension skeleton 4 can perform telescopic movement relative to the leg rest skeleton 3.

[0044] Optionally, as Figures 1 to 8 As shown, in some embodiments, it further includes a stepped bolt 11 and a nut 12. A strip-shaped hole 13 is formed in the leg rest skeleton 3. The stepped bolt 11 passes through the leg rest extension skeleton 4 and is inserted into the strip-shaped hole 13, and the nut 12 is threadedly connected to the stepped bolt 11.

[0045] In the above optional embodiments, it should be noted that the stepped bolt 11 plays a role of limiting and guiding.

[0046] The beneficial effect of the above optional embodiments is that by providing the stepped bolt 11 and the nut 12, the leg rest extension skeleton 4 can perform telescopic movement along the length direction of the strip-shaped hole 13 under their guiding action.

[0047] Optionally, as Figures 1 to 8 As shown, in some embodiments, the leg rest extension skeleton 4 is slidably abutted against the lower surface of the leg rest skeleton 3.

[0048] In the above optional embodiments, it should be noted that there is a very small gap between the leg rest extension skeleton 4 and the leg rest skeleton 3.

[0049] The beneficial effect of the above optional embodiments is that by the leg rest extension skeleton 4 being slidably abutted against the lower surface of the leg rest skeleton 3, it can not only avoid the friction between the two, but also avoid the occurrence of deflection caused by the relative movement between the two.

[0050] Optionally, as Figures 1 to 8 As shown, in some embodiments, the strip-shaped hole 13 extends along the length direction of the leg rest skeleton 3.

[0051] In the above optional embodiments, it should be noted that two strip-shaped holes 13 are provided, and the two strip-shaped holes 13 are arranged in parallel.

[0052] The beneficial effect of the above optional embodiments is that by providing the strip-shaped hole 13, it plays a role of positioning and guiding the leg rest extension skeleton 4.

[0053] Optionally, as Figures 1 to 8 shown, in some embodiments, it further includes a first bracket 6 and a second bracket 7. The first bracket 6 is installed on the lower surface of the seat cushion body 1, and the second bracket 7 is installed on the lower surface of the leg rest frame 3. The fixed end of the electric push rod 5 is hinged inside the first bracket 6, and the telescopic end of the electric push rod 5 is hinged inside the second bracket 7.

[0054] Optionally, as Figures 1 to 8 shown, in some embodiments, the structures of the first bracket 6 and the second bracket 7 are exactly the same, and both the first bracket 6 and the second bracket 7 are U-shaped bent plate-like structures.

[0055] In the above optional embodiments, it should be noted that the first bracket 6 and the second bracket 7 can also be in other structural forms.

[0056] The beneficial effects of the above optional embodiments are: Through the arrangement of the first bracket 6 and the second bracket 7, a better installation position for the fixed end and the telescopic end of the electric push rod 5 is achieved, and the interference phenomenon generated during the use of the electric push rod 5 is avoided.

[0057] Optionally, as Figures 1 to 8 shown, in some embodiments, a notch is provided at the rear edge of the leg rest extension frame 4. When the leg rest extension frame 4 coincides with the leg rest frame 3, the second bracket 7 is located inside the notch.

[0058] In the above optional embodiments, it should be noted that the shape of the notch is U-shaped.

[0059] The beneficial effects of the above optional embodiments are: Through the notch provided on the leg rest extension frame 4, an avoidance space is provided for the installation of the second bracket 7.

[0060] Optionally, as Figures 1 to 8 shown, in some embodiments, there are two groups of seat cushion fixing plates 2. The electric push rod 5 is arranged at the central symmetry plane of the lower surface of the seat cushion body 1, and the two groups of seat cushion fixing plates 2 are symmetrically arranged with respect to the electric push rod 5.

[0061] In the above optional embodiments, it should be noted that in addition, the number of seat cushion fixing plates 2 can also be set according to actual needs.

[0062] The beneficial effects of the above optional embodiments are: By providing two groups of seat cushion fixing plates 2, the smoothness of the extension of the leg rest frame 3 is ensured.

[0063] Optionally, as Figure 7As shown, in some embodiments, the radius of the running track line of the leg rest frame 3 near the top corner of the seat cushion body 1 is smaller than the distance between the rotation center point of the leg rest frame 3 and the nearest point of the seat cushion body 1. Simply put, during the process of the leg rest frame 3 being retracted to unfolded, the running tracks of all points on the leg rest frame 3 do not interfere with the seat cushion body 1. As Figure 5 shown, when the leg rest frame 3 is perpendicular to the lower end surface of the seat cushion body 1, the leg rest frame 3 is located inside the dashed line at the leftmost edge of the seat cushion body 1.

[0064] The adjustment principle of the above embodiments is as follows: when the leg rest frame 3 is in the retracted state, the push rod of the electric push rod 5 is in the retracted state; both ends of the first connecting rod 8 are hinged to the seat cushion fixing plate 2 and the leg rest frame 3 respectively, both ends of the second connecting rod 9 are hinged to the seat cushion fixing plate 2 and the leg rest frame 3 respectively, and both ends of the third connecting rod 10 are hinged to the leg rest extension frame 4 and the seat cushion fixing plate 2 respectively; a strip-shaped hole 13 is designed on the leg rest frame 3, and the stepped bolt 11 passes through the strip-shaped hole 13 and is fixed to the leg rest extension frame 4. The stepped bolt 11 can slide in the long circular hole, and thus the leg rest extension frame 4 can also slide in the strip-shaped hole 13; when the leg rest is lifted, the push rod of the electric push rod 5 extends, and the first connecting rod 8 and the second connecting rod 9 jointly act to push the leg rest frame 3 to lift; while the leg rest is being lifted, the third connecting rod 10 also unfolds together to push the leg rest extension frame 4 to extend.

[0065] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0066] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A leg support linkage mechanism, characterized in that, It includes a seat cushion body (1), a seat cushion fixing plate (2), a leg rest frame (3), an electric push rod (5) and a first connecting rod (8). The lower surface of the seat cushion body (1) is provided with the seat cushion fixing plate (2). The lower end of the seat cushion fixing plate (2) is hinged to one end of the first connecting rod (8). The other end of the first connecting rod (8) is hinged to the leg rest frame (3). The fixed end of the electric push rod (5) is hinged to the lower surface of the seat cushion body (1), and the telescopic end of the electric push rod (5) is hinged to the lower surface of the leg rest frame (3). It further includes a second connecting rod (9). One end of the second connecting rod (9) is hinged to the lower end of the seat cushion fixing plate (2), and the other end of the second connecting rod (9) is hinged to the leg rest frame (3). The second connecting rod (9) is located on the front side of the first connecting rod (8). It further includes a leg rest extension frame (4) and a third connecting rod (10). The leg rest extension frame (4) is slidably connected to the lower surface of the leg rest frame (3). One end of the third connecting rod (10) is hinged to the lower end of the seat cushion fixing plate (2), and the other end of the third connecting rod (10) is hinged to the lower surface of the leg rest extension frame (4). It further includes a stepped bolt (11) and a nut (12). A strip-shaped hole (13) is formed in the leg rest frame (3). The stepped bolt (11) passes through the leg rest extension frame (4) and is inserted into the strip-shaped hole (13), and the nut (12) is threadedly connected to the stepped bolt (11).

2. The leg rest linkage mechanism according to claim 1, characterized in that, The leg rest extension frame (4) is slidably abutted against the lower surface of the leg rest frame (3).

3. The leg support linkage mechanism according to claim 1, characterized in that The strip-shaped hole (13) extends along the length direction of the leg rest frame (3).

4. A leg rest linkage mechanism according to claim 1, characterized in that, It further includes a first bracket (6) and a second bracket (7). The first bracket (6) is installed on the lower surface of the seat cushion body (1), and the second bracket (7) is installed on the lower surface of the leg rest frame (3). The fixed end of the electric push rod (5) is hinged inside the first bracket (6), and the telescopic end of the electric push rod (5) is hinged inside the second bracket (7).

5. The leg support linkage mechanism according to claim 4, wherein, The structures of the first bracket (6) and the second bracket (7) are exactly the same. Both the first bracket (6) and the second bracket (7) are U-shaped bent plate-like structures.

6. The leg support linkage mechanism according to claim 4, characterized in that, A notch is formed at the rear edge of the leg rest extension frame (4). When the leg rest extension frame (4) coincides with the leg rest frame (3), the second bracket (7) is located inside the notch.

7. A leg support linkage mechanism according to claim 1, characterized in that, The radius of the running track line at the vertex of the leg rest frame (3) close to the seat cushion body (1) is smaller than the distance between the rotation center point of the leg rest frame (3) and the nearest point of the seat cushion body (1).

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