EXTENDED LEG MECHANISM, FUNCTIONAL IRON FRAME AND MOVABLE SOFA

Abstract

An extended leg mechanism includes a first leg connecting rod and a second leg connecting rod, where the first leg connecting rod, a third leg connecting rod, the second leg connecting rod and a fourth leg connecting rod are pivotally connected in sequence; the third and fourth leg connecting rods are pivotally connected to an identical first footrest assembly; the first footrest assembly includes a vertical plate pivotally connected to the third and fourth leg connecting rods, and a top portion of the vertical plate is provided with a mounting plate, where the vertical plate is pivotally connected to first and second footrest connecting rods, the other end of the first and second footrest connecting rods is pivotally connected to an identical second footrest assembly, and the second footrest assembly, a third footrest connecting rod and the fourth leg connecting rod are pivotally connected in sequence.

Claims

1. An extended leg mechanism, comprising a first leg connecting rod and a second leg connecting rod, wherein a front end of the first leg connecting rod is pivotally connected to a third leg connecting rod, a rear portion of the third leg connecting rod is pivotally connected to a front portion of the second leg connecting rod, and a front end of the second leg connecting rod is pivotally connected to a fourth leg connecting rod; the third leg connecting rod and the fourth leg connecting rod are pivotally connected to an identical first footrest assembly; and the first footrest assembly comprises a vertical plate pivotally connected to the third leg connecting rod and the fourth leg connecting rod, and a top portion of the vertical plate is provided with a mounting plate, wherein the vertical plate is pivotally connected to first ends of a first footrest connecting rod and a second footrest connecting rod, second ends of the first footrest connecting rod and the second footrest connecting rod is pivotally connected to an identical second footrest assembly, a rear portion of the second footrest assembly is pivotally connected to a third footrest connecting rod, and a rear end of the third footrest connecting rod is pivotally connected to a front end of the fourth leg connecting rod.

2. The extended leg mechanism according to claim 1, wherein a distance H1 from an axis of a shaft where the fourth leg connecting rod is pivotally connected to the vertical plate to a top surface of the mounting plate is 120-140 mm.

3. The extended leg mechanism according to claim 2, wherein a top portion of an inner side wall of the vertical plate is fixedly connected to a fourth footrest connecting rod, and a front end of the fourth footrest connecting rod extends out of the vertical plate and is pivotally connected to a rear end of the first footrest connecting rod.

4. The extended leg mechanism according to claim 1, wherein a middle portion of the first leg connecting rod is provided with a first limiting pin, the second leg connecting rod is provided with a first limiting surface, wherein the first limiting surface cooperates with the first limiting pin, and the third leg connecting rod is provided with a second limiting surface, wherein the second limiting surface cooperates with the first limiting pin.

5. The extended leg mechanism according to claim 4, wherein a front portion of the third leg connecting rod is provided with a second limiting pin, and the vertical plate is provided with a third limiting surface, wherein the third limiting surface cooperates with the second limiting pin.

6. A functional iron frame, comprising two symmetrical seat frame mounting plates, wherein a front side of the seat frame mounting plate is provided with the extended leg mechanism according to claim 1, and a front end of the seat frame mounting plate is provided with an extension mounting plate.

7. The functional iron frame according to claim 6, wherein a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

8. A movable sofa, comprising a sofa seat, wherein the functional iron frame according to claim 6 is provided in the sofa seat; and when the functional iron frame is in a sitting state, a distance H3 from a highest point of the extension mounting plate to ground is 280-350 mm.

9. The movable sofa according to claim 8, wherein a height of a sofa foot at a bottom portion of the sofa seat is 50-100 mm.

10. The functional iron frame according to claim 6, wherein in the extended leg mechanism, a distance H1 from an axis of a shaft where the fourth leg connecting rod is pivotally connected to the vertical plate to a top surface of the mounting plate is 120-140 mm.

11. The functional iron frame according to claim 10, wherein in the extended leg mechanism, a top portion of an inner side wall of the vertical plate is fixedly connected to a fourth footrest connecting rod, and a front end of the fourth footrest connecting rod extends out of the vertical plate and is pivotally connected to a rear end of the first footrest connecting rod.

12. The functional iron frame according to claim 6, wherein in the extended leg mechanism, a middle portion of the first leg connecting rod is provided with a first limiting pin, the second leg connecting rod is provided with a first limiting surface, wherein the first limiting surface cooperates with the first limiting pin, and the third leg connecting rod is provided with a second limiting surface, wherein the second limiting surface cooperates with the first limiting pin.

13. The functional iron frame according to claim 12, wherein in the extended leg mechanism, a front portion of the third leg connecting rod is provided with a second limiting pin, and the vertical plate is provided with a third limiting surface, wherein the third limiting surface cooperates with the second limiting pin.

14. The movable sofa according to claim 8, wherein in the functional iron frame, a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

15. The functional iron frame according to claim 10, wherein a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

16. The functional iron frame according to claim 11, wherein a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

17. The functional iron frame according to claim 12, wherein a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

18. The functional iron frame according to claim 13, wherein a distance H2 between a front end face of the extension mounting plate and a front end face of the seat frame mounting plate is 50-90 mm.

19. The movable sofa according to claim 8, wherein in the extended leg mechanism of the functional iron frame, a distance H1 from an axis of a shaft where the fourth leg connecting rod is pivotally connected to the vertical plate to a top surface of the mounting plate is 120-140 mm.

20. The movable sofa according to claim 8, wherein in the extended leg mechanism of the functional iron frame, a top portion of an inner side wall of the vertical plate is fixedly connected to a fourth footrest connecting rod, and a front end of the fourth footrest connecting rod extends out of the vertical plate and is pivotally connected to a rear end of the first footrest connecting rod.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic diagram showing the structure of the prior art extension assembly.

[0022] FIG. 2 is a rear view of an extended leg mechanism in an unfolded state according to the present invention.

[0023] FIG. 3 is a front view of the extended leg mechanism in the unfolded state according to the present invention.

[0024] FIG. 4 is a rear view of the extended leg mechanism in a folded state according to the present invention.

[0025] FIG. 5 is a front view of the extended leg mechanism in the folded state according to the present invention.

[0026] FIG. 6 is a schematic diagram showing the structure of a functional iron frame according to the present invention.

[0027] FIG. 7 is an enlarged view of the portion of FIG. 6.

[0028] FIG. 8 is a diagram showing the movable sofa in a lying state according to the present invention.

[0029] FIG. 9 is a diagram showing the movable sofa in a sitting state according to the present invention.

[0030] Among them, 1 extended leg mechanism, 11 first leg connecting rod, 111 first limiting pin, 12 second leg connecting rod, 121 first limiting surface, 13 third leg connecting rod, 131 second limiting surface, 132 second limiting pin, 14 fourth leg connecting rod, 15 first footrest assembly, 151 vertical plate, 1511 third limiting surface, 1512 fourth footrest connecting rod, 152 mounting plate, 16 second footrest connecting rod, 17 first footrest connecting rod, 18 second footrest assembly, 19 third footrest connecting rod, 2 seat frame mounting plate, 21 extension mounting plate, 3 sofa seat, 31 sofa foot, 4 push rod motor, 5 driving rod, 6 large footrest plate, 7 small footrest plate, 8 backrest mechanism.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention is further explained below in conjunction with the drawings and detailed embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, the various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0032] As shown in FIGS. 2-5, the extended leg mechanism 1 includes the first leg connecting rod 11 and the second leg connecting rod 12. The front end of the first leg connecting rod is pivotally connected to the third leg connecting rod 13. The rear portion of the third leg connecting rod is pivotally connected to the front portion of the second leg connecting rod. The front end of the second leg connecting rod is pivotally connected to the fourth leg connecting rod 14. The middle portion of the first leg connecting rod is provided with the first limiting pin 111. The second leg connecting rod is provided with the first limiting surface 121 that cooperates with the first limiting pin. The third leg connecting rod is provided with the second limiting surface 131 that cooperates with the first limiting pin. When the leg mechanism is unfolded, the first limiting pin abuts against the first limiting surface to improve the stability of the leg mechanism when it is unfolded. When the leg mechanism is folded, the first limiting pin abuts against the second limiting surface to prevent the leg mechanism from being folded too much and affecting the re-expansion. The third and fourth leg connecting rods are pivotally connected to the identical first footrest assembly 15. The first footrest assembly includes the vertical plate 151. The bottom portion of the vertical plate is pivotally connected to the fourth leg connecting rod, the middle portion rear side of the vertical plate is pivotally connected to the third leg connecting rod, and the front portion of the third leg connecting rod is provided with the second limiting pin 132. The vertical plate is located at the side walls of the third leg connecting rod and the fourth leg connecting rod and is provided with the third limiting surface 1511 that cooperates with the second limiting pin. When the leg mechanism is folded, the second limiting pin abuts against the third limiting surface to prevent the first footrest assembly from overturning too much, affecting its reverse rotation. The top portion of the vertical plate is bent into the mounting plate 152. The middle portion of the vertical plate is pivotally connected to the second footrest connecting rod 16. The inner side wall of the vertical plate located between the second footrest connecting rod and the mounting plate is fixedly connected to the fourth footrest connecting rod 1512. The front end of the fourth footrest connecting rod extends out of the vertical plate and is pivotally connected to the first footrest connecting rod 17. The distance H1 from the axis of the shaft where the fourth leg connecting rod is pivotally connected to the vertical plate to the top surface of the mounting plate is 128 mm. The height of the vertical plate is increased. While satisfying the installation conditions of the first and second footrest connecting rods, the distance between the mounting plate and the seat frame mounting plate when the leg mechanism is unfolded is also increased, allowing the user to enter a zero-gravity state when lying down, further improving comfort. The front ends of the first and second footrest connecting rods are pivotally connected to the identical second footrest assembly 18, and the rear portion of the second footrest assembly is pivotally connected to the third footrest connecting rod 19, and the rear end of the third footrest connecting rod is pivotally connected to the front end of the fourth leg connecting rod.

[0033] As shown in FIGS. 6-7, a functional iron frame includes two symmetrical seat frame mounting plates 2, and the front side of the seat frame mounting plate is provided with an extended leg mechanism. Specifically, the first and second leg connecting rods are pivotally connected to the front side wall of the seat frame mounting plate, and the front end of the seat frame mounting plate is provided with the extension mounting plate 21. The distance H2 between the front end face of the extension mounting plate and the front end face of the seat frame mounting plate is 60 mm, which is used to deepen the seat depth and improve comfort.

[0034] As shown in FIGS. 8-9, a movable sofa includes the sofa seat 3, in which a functional iron frame is provided. When the functional iron frame is in a sitting state, the distance H3 from the highest point of the extension mounting plate to the ground is 290 mm, and the height of the sofa foot 31 at the bottom portion of the sofa seat is 50-100 mm.

[0035] The specific working process and principle of the movable sofa is as follows:

[0036] When sitting, the push rod motor 4 is started, the telescopic rod of the push rod motor extends forward, the second leg connecting rod is driven by the driving rod 5 to rotate outward around the pivot axis between the second leg connecting rod and the seat frame mounting plate, and the third and fourth leg connecting rods are driven by the second leg connecting rod to unfold forward. In the process of unfolding forward, the first footrest assembly is driven by the fourth leg connecting rod to rotate around the pivot axis between the first footrest assembly and the third leg connecting rod. When the first footrest assembly rotates, the second footrest assembly is forced by the first and second footrest connecting rods to rotate, and the first footrest assembly is supported on the front side of the second footrest assembly, so as to enter a TV posture. At this time, the large footrest plate 6 provided on the first footrest assembly and the small footrest plate 7 provided on the second footrest assembly can fully support the support surfaces of the legs and feet, meet the usage needs of tall users with long legs, and improve the comfort of the seat.

[0037] When the TV posture is converted to a lying posture, the push rod motor is configured to be started, and the telescopic rod of the push rod motor is configured to be further extended to the front side, and the backrest mechanism 8 is forced to open by driving the seat frame mounting plate to move obliquely upward. Since the height of the vertical plate is increased, the user can enter a zero-gravity state at this time, and the comfort is improved.

[0038] When the TV posture is restored to a sitting posture, the push rod motor is started, and the telescopic rod of the push rod motor is retracted. The second leg connecting rod is driven by the driving rod to rotate inward around the pivot axis between the second leg connecting rod and the seat frame mounting plate, and the third and fourth leg connecting rods are driven by the second leg connecting rod to fold to the rear side. In the process of folding to the rear side, the fourth leg connecting rod pulls the second footrest assembly through the third footrest connecting rod, forcing the small footrest plate to move to the bottom of the large footrest plate, and finally to hide behind the large footrest plate.

[0039] The present invention realizes the expansion or folding of the small footrest plate through a quadrilateral structure constructed by the first and second footrest assemblies and first and second footrest connecting rods. When the small footrest plate needs to be expanded, the third and fourth leg connecting rods push the quadrilateral structure to move obliquely upward, and under the action of the third leg connecting rod, the quadrilateral structure flips upward, and at the same time, the third footrest connecting rod rotates around the pivot axis between the third footrest connecting rod and the third leg connecting rod, pushing the second footrest assembly to move forward, thereby avoiding scratching the ground and reducing the seat height of the functional iron frame. When the seat depth is deepened and the seat height is lowered, for users with a tall and large build, the calf can be avoided from abutting against the large footrest plate when sitting on the sofa, thereby improving comfort. In addition, because the first, second, and third footrest connecting rods can support the second footrest assembly at a longer distance in front of the first footrest assembly, compared with the prior art, the distance between the first and second footrest assemblies is increased by nearly 100 mm, which can better meet the usage needs of users with a tall and large build.