Movable leg frame and leg support suitable for seat

Abstract

The utility model relates to the field of household article machinery, in particular to a structural design of a seat leg frame. According to the technical scheme, the movable leg frame suitable for the seat comprises a seat frame, a driving device and a leg support, the leg support comprises a leg base frame, a leg sliding frame, a transverse connecting strip and a sliding connecting plate, the leg base frame is driven by the driving device to rotate relative to the seat frame, the leg sliding frame is slidably connected to the leg base frame, the transverse connecting strip is connected with the leg base frame, the sliding connecting plate is hinged to the transverse connecting strip, and a transverse sliding groove is formed in the leg sliding frame. One end of the sliding connection plate comprises a sliding connection head used for sliding in the transverse sliding groove. The utility model aims to provide the movable leg frame and the leg support suitable for the seat, the universality is strong, the leg support can effectively support legs and feet, and the comfort is improved; and the number and the size of the transmission devices and the driving devices are controllable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of household goods machinery, in particular to the structure design of seat leg frame. BACKGROUND

[0002] With the progress of the times and the improvement of living standards, in addition to the traditional support function, the comfort and the demand for wrapping are paid more and more attention. Such as massage sofa, single sofa chair, e-sports chair, ergonomic chair and other high-end products have gradually become the mainstream products in the market.

[0003] Among these seats, in addition to the traditional cushion part and the waist part, the third support body, leg support, is added. In order to further improve the comfort, the leg support will be set to be movable. For example, the Chinese patent document with the publication number CN202122784192.8 discloses a seat structure, which contains a leg support, and the leg support can be lifted under the push of the driving device, improving the comfort of the human body.

[0004] However, this technical solution has the contradiction between comfort and seat size. Since the leg support is usually folded under the seat in the non-use state, the space here is limited for small-size seats, so the size of the lifted leg support will not be large, and the area of the support for the human leg will be small, which will cause discomfort for users with high height and long legs. On the contrary, if sufficient support is needed here, the leg support needs to be made larger, which is difficult to fold and place on a small-size seat.

[0005] In order to solve this contradiction, some researchers have made the leg support as a split type, that is, the leg support body slides on a track, thereby increasing the support area. However, this requires two sets of driving structure and transmission structure to drive the linear movement of the leg support body and the rotation of the entire leg support, which not only causes the increase of production cost, but also causes the increase of volume. And such as e-sports chair, single ergonomic chair, which is relatively light and thin, is difficult to apply. INVENTION CONTENTS

[0006] The utility model aims at providing a movable leg frame and leg support suitable for seats, which has strong versatility, can effectively support the legs and feet, increase comfort, control the number of control transmission devices and driving devices, and can be applied to sofa chairs, massage chairs, car seats, and also to small-volume seat products such as e-sports chairs and ergonomic chairs.

[0007] The utility model discloses a movable leg support suitable for a seat, which comprises a seat frame, a driving device and a leg support.

[0008] As a preferred embodiment of the utility model, the cross connecting strip is in a bent type, comprising a short connecting strip and an inclined connecting strip, and the position of the inclined connecting strip connected with the leg base frame is closer to the seat frame than the position of the short connecting strip connected with the leg base frame.

[0009] As a preferred embodiment of the utility model, the leg base frame is connected with the seat frame through a transmission device.

[0010] As a preferred embodiment of the utility model, the transmission device comprises a fixed plate connected with the seat frame, a transmission plate hinged with the fixed plate and a pushing plate hinged with the transmission plate and the leg base frame at two ends, and the driving device applies power on the transmission plate.

[0011] As a preferred embodiment of the utility model, the fixed plate is fixed on the lower surface of the seat frame.

[0012] As a preferred embodiment of the utility model, a reset torsional spring is arranged between the fixed plate and the transmission plate.

[0013] As a preferred embodiment of the utility model, the transmission device is two sets, which are arranged on the leg base frame

[0014] As a preferred embodiment of the utility model, it further comprises a swing frame two, one end of the swing frame is connected with the transmission plate, and the swing frame comprises a contact wheel, and all the driving devices are connected with a push plate for pushing the contact wheel.

[0015] As a preferred embodiment of the utility model, the leg base frame comprises a guide straight groove, and the leg slide frame comprises an insertion slide plate matched with the guide straight groove.

[0016] The leg support comprises the movable leg support suitable for the seat and a leg pad, and the leg pad is installed on the leg slide frame.

[0017] In summary, the utility model has the following beneficial effects:

[0018] 1. In the normal state, the leg slide frame is retracted, the leg support is lowered, and is collected below the seat frame 2, without occupying space.

[0019] 2. When leg support is needed, the leg support is swung up, and the leg slide is slid forward, effectively extending the distance of the support area, which can be suitable for users with higher elevations and longer legs.

[0020] 3. Throughout the process, the only real power comes from a set of driving devices, without the need for multiple sets of driving, further reducing the pressure on space placement.

[0021] 4. The connection between the ball connecting plate and the seat frame relies on the ball head bearing connection, which allows the ball connecting plate to move in multiple directions relative to the seat frame.

[0022] 5. The forward sliding action of the foot slide and the forward swinging action of the leg base are consistent and synchronized due to the presence of the sliding connecting plate, making the movement of the leg support more smooth and stable.

[0023] 6. A reset torsional spring is provided between the fixed plate and the transmission plate, which provides an additional restoring force when the driving device returns to its original position during the return swing of the leg support, making the return swing smoother. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of the leg support in the folded state of example 1;

[0025] Figure 2 is a schematic view of the leg support in the extended state of example 1;

[0026] Figure 3 is Figure 2 a partial enlarged view of

[0027] In the drawings:

[0028] 1. fixed frame, 2. seat frame, 3. back frame, 6. swing frame two, 61. contact wheel, 7. leg support, 71. transmission device, 711. fixed plate, 712. transmission plate, 713. push plate, 72. leg slide, 721. horizontal sliding groove, 73. leg base, 74. horizontal connecting strip, 741. short connecting strip, 742. inclined connecting strip, 75. ball connecting plate, 76. sliding connecting plate, 761. sliding connecting head, 81. connecting frame shaft, 82. pull plate, 83. intermediate plate, 84. connecting rod, 9. driving device. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This specific embodiment is only an explanation of the present application, and is not a limitation of the present application. Those skilled in the art can make modifications to this embodiment without creative contribution after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

[0031] Example 1, as Figure 1 As shown, it includes a fixed frame 1, on which a driving device 9 is installed. The driving device 9 can use mature products in the prior art, such as electric cylinders, oil cylinders, and air cylinders, to drive the piston rod to move linearly in the front and rear directions, providing power for the movement of the components.

[0032] In this case, if Figure 3 As shown, the piston rod is connected to a push plate, and the swing frame 2 6 includes a contact wheel. The push plate transmits power by pushing the contact wheel, making the power transmission more uniform and smooth. The swing frame 2 6 serves as a transmission component, and its function is to drive the entire leg support 7 to tilt forward and backward in the vertical direction relative to the seat frame 2.

[0033] Specifically, the transmission device 71 is a multi-link structure, consisting of two sets, one on the left and one on the right, across the width of the seat. Each set has the same structure, with a fixed plate 711 fixedly connected to the lower surface of the seat frame 2 and considered a fixed member relative to the seat frame 2. The second swing frame 6 is connected to a transmission plate 712, one end of which is connected to the fixed plate 711 and the other end is hinged to a push plate 713. The other end of the push plate 713 is hinged to the leg base 73. Thus, as the second swing frame 6 moves forward, it provides power to the leg base 73, causing the leg base 73 to swing and rise relative to the seat frame 2.

[0034] The leg carriage 72 and the leg base 73 are connected in a sliding manner in the front-rear direction. The leg base 72 includes a guide straight groove, and the leg carriage 72 includes an insertion slide for cooperating with the guide straight groove. The cooperation between the two makes the sliding process more stable.

[0035] The leg slide 72 is the component that actually supports the human body's legs, and the power for it to slide back and forth relative to the leg base 73 comes from the sliding plate 76. Figure 2 and Figure 3 As shown, a transverse connecting bar 74 is connected to the leg frame 73, to which a sliding connecting plate 76 is hingedly connected. The leg carriage 72 includes a transverse connecting slot 721 extending along the horizontal width. The front end of the sliding connecting plate 76 is provided with a sliding joint 761, which is positioned within the transverse connecting slot 721. Its rear end is connected to the seat frame 2 via a ball connecting plate 75. The connection between the ball connecting plate 75 and the seat frame 2 relies on a ball bearing, allowing the ball connecting plate 75 to move in multiple directions relative to the seat frame 2. The sliding connecting plate 76 and the ball connecting plate 75 are connected by an L-shaped flat iron. This is because the ball connecting plate 75 side is more vertically tilted, while the sliding connecting plate 76 side is more horizontally tilted.

[0036] In summary, the movement principle of the entire leg support 7 is as follows: Figure 1As shown, at the beginning, the whole leg support 7 is in the contracted state, located in the lower position of the seat frame 2, not in contact with the human leg. Then the driving device 9 starts to move, which drives the push plate 713 to swing upward and forward through the transmission of the swing frame 6. Then, the leg base frame 73 swings forward and upward relative to the seat frame 2. As shown, Figure 2 and Figure 3 As shown, during the outward swing of the leg base frame 73, the sliding connecting plate 76 will rotate relative to the horizontal connecting strip 74. The ball connecting plate 75 will have horizontal rotation and vertical rotation relative to the seat frame 2, so the ball connecting plate 75 is connected to the seat frame 2 through the ball head bearing. During the rotation of the sliding connecting plate 76 relative to the horizontal connecting strip 73, the sliding connecting head 761 will give a pushing force to the groove wall of the horizontal sliding groove 721, thereby pushing the leg sliding frame 72 to slide forward relative to the leg base frame 73. Figure 2 and Figure 3 That is, the leg support 7 swings upward, and the leg sliding frame 72 slides forward.

[0037] At this point, on the one hand, the leg sliding frame 72 is contracted in the normal state, and the leg support 7 swings downward and is collected below the seat frame 2, without occupying space. When the leg support is needed, the leg support 7 swings upward, and the leg sliding frame 72 slides forward, effectively extending the distance of the support area, which can be applied to the foot support of users with high height and long legs. On the other hand, during the whole process, the real power only comes from a set of driving device 9, without multiple sets of driving, further reducing the pressure of space placement.

[0038] In addition, due to the existence of the sliding connecting plate 76, the consistency and synchronization of the forward sliding action of the foot sliding frame 72 and the forward swinging action of the leg base frame 73 are good, and the moving action of the whole leg support is more smooth and stable.

[0039] A reset torsional spring is arranged between the fixed plate 711 and the transmission plate 712. Due to the existence of the reset torsional spring, when the driving device 9 returns during the swing-back process of the whole leg support 7, the torsional force of the reset torsional spring can provide an additional restoring force, so that the swing-back is more smooth.

[0040] The leg support includes the movable leg support described above, and further includes a leg pad installed on the leg sliding frame 72.

Claims

1. A movable leg support for a seat, comprising a seat frame (2), a drive device (9) and a leg support (7), characterized in that: The leg support (7) includes a leg base (73) that rotates relative to the seat frame (2) under the drive of the driving device (9), a leg slide (72) slidably connected to the leg base (73), a transverse connecting bar (74) connected to the leg base (73), and a sliding connecting plate (76) hinged to the transverse connecting bar (74), wherein a transverse sliding groove (721) is provided on the leg slide (72), and one end of the sliding connecting plate (76) includes a sliding joint (761) for sliding in the transverse sliding groove (721), and the other end is connected to a ball connecting plate (75), and the ball connecting plate (75) is connected to the seat frame (2) through a ball bearing.

2. The movable leg support for a chair according to claim 1, characterized in that: The transverse connecting bar (74) is bent and includes a short connecting bar (741) and an oblique connecting bar (742). The position where the oblique connecting bar (742) is connected to the leg base frame (73) is closer to the seat frame (2) than the position where the short connecting bar (741) is connected to the leg base frame (73).

3. The movable leg support for a chair according to claim 1, characterized in that: The leg base (73) is connected to the seat frame (2) via a transmission device (71).

4. The movable leg support for a chair according to claim 3, characterized in that: The transmission device (71) comprises a fixed plate (711) connected to the seat frame (2), a transmission plate (712) hinged to the fixed plate (711), and a push plate (713) with two ends hinged to the transmission plate (712) and the leg base (73), respectively. The power of the driving device (9) is applied to the transmission plate (712).

5. The movable leg support for a chair according to claim 4, characterized in that: The fixing plate (711) is fixed to the lower surface of the seat frame (2).

6. The movable leg support for a chair according to claim 4, characterized in that: A return torsion spring is provided between the fixing plate (711) and the transmission plate (712).

7. The movable leg stand suitable for a chair according to claim 3, characterized in that: The transmission device (71) comprises two sets, which are arranged on both sides in the width direction of the leg base frame (73).

8. The movable leg stand suitable for a chair according to claim 4, characterized in that: It also includes a second swing frame (6), one end of which is connected to the transmission plate (712), the second swing frame (6) includes a contact wheel (61), and the driving device (9) is connected to a push plate for pushing the contact wheel (61).

9. The movable leg support for a chair according to claim 1, characterized in that: The leg base (73) includes a guide straight groove, and the leg slide (72) includes an insertion slide for cooperating with the guide straight groove.

10. Leg support, characterized in that, It comprises a movable leg frame suitable for a seat as described in any one of claims 1 to 9, and also comprises a leg pad, wherein the leg pad is mounted on the leg slide (72).

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