Mechanical extension device for sofa

Abstract

The invention discloses a mechanical extension device for a sofa, comprising a base assembly, a legrest assembly, a seat assembly, a backrest assembly and an electric push rod; the seat assembly comprises a seat rail, a locking rod, a front connecting rod, a triangular rotating plate, a swing connecting rod, a rear connecting rod and a supporting connecting rod; the legrest assembly comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a driving rod and a legrest board; the front end of the first connecting rod is hinged to the rear part of the front end of the seat rail, the rear end is hinged to the rear end of the second connecting rod, the front end of the second connecting rod is hinged to the upper end of the footrest board, the middle part of the footrest board is hinged to the front end of the third connecting rod, the rear end of the third connecting rod is hinged to the rear end of the fourth connecting rod, the front end of the fourth connecting rod is hinged to the front end of the seat rail, the rear end of the driving rod is hinged to the middle part of the swing connecting rod, and the front end is hinged to the middle part of the first connecting rod; the rear end of the electric push rod is hinged to the base assembly, and the front end piston rod is connected to the triangular rotating plate. The invention has the characteristics of simple structure and compactness.

Description

Technical Field

[0001] The invention relates to the field of sofa manufacturing, and more specifically to a sofa mechanical stretching device. Background Art

[0002] As a kind of household item, a sofa comprises a backrest, a main body and footrests. In order to realize the rotation of the backrest and footrests for the convenience of lying down, the existing sofas are often provided with motors and transmission devices to adjust the inclination angle of the sofa backrest and the extension length and height of the sofa footrests, which facilitates the user's use of the sofa and improves the comfort of use.

[0003] However, the transmission device in the prior art still has defects. For example, the patent document with publication number CN206543070U discloses a sofa, including a sofa body and a sofa bracket connected with the sofa body, wherein the sofa body includes an external fixing seat, an armrest, a cushion, a lumbar support, a footrest and a backrest; the characteristics are as follows: the external fixing seat includes a bottom plate and a side wall; the backrest includes an inner backrest and an outer backrest; the outer backrest is fixed to the bottom plate; the sofa bracket includes a backrest assembly, a support cushion assembly, a foldable and retractable footrest assembly, a fixed bottom frame, a push rod, a first connecting rod assembly, a second connecting rod assembly and a third connecting rod assembly; the armrest is fixed to the top of the side wall; the fixed bottom frame is fixed to the bottom plate; the backrest assembly is fixed to the inner backrest; the push rod moves under the drive of the motor. In this technical solution, the structure of the entire transmission device is relatively complex, and the space occupied by it at the bottom of the sofa is relatively large, resulting in a small free space at the bottom of the sofa. On the other hand, when each component is in a retracted state, the footrest can only be retracted to a vertical state and is blocked in front of the bottom of the sofa seat, so that the position of the bottom of the sofa is not easy to be cleaned. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a mechanical extension device for a sofa, which has the characteristics of simple and compact structure and can increase the free space at the bottom of the sofa for easy cleaning.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A mechanical extension device for a sofa, characterized in that it comprises a base assembly, a leg rest assembly, a seat assembly, a backrest assembly and an electric push rod;

[0007] The base assembly includes two outer mounting plates arranged in parallel, a support rod arranged between the two outer mounting plates, and an inner mounting plate installed on the support rod and located on the inner side of the outer mounting plates;

[0008] The seat assembly comprises a seat rail, a locking rod, a front connecting rod, a triangular rotating plate, a swing connecting rod, a rear connecting rod and a supporting connecting rod; the rear end of the swing connecting rod is hinged to the rear end of the inner mounting plate, the middle part is slidably fitted on the inner mounting plate up and down, the front end is hinged to the middle part of the locking rod, the upper end of the locking rod is hinged to the rear part of the front end of the seat rail, the lower end is hinged to the front end of the front connecting rod, the rear end of the front connecting rod is hinged to the rear end angle of the triangular rotating plate, the upper end angle of the triangular rotating plate is hinged to the front end of the inner mounting plate, the front end of the supporting connecting rod is supported against the bottom wall of the swing connecting rod, the middle part is hinged to the front part of the rear end of the swing connecting rod, the rear end is hinged to the lower end of the rear connecting rod, and the upper end of the rear connecting rod is hinged to the rear end of the seat rail;

[0009] The legrest assembly includes a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a driving rod and a legrest board; the front end of the first connecting rod is hinged to the rear part of the front end of the seat rail, and the rear end is hinged to the rear end of the second connecting rod, the front end of the second connecting rod is hinged to the upper end of the footrest board, the middle part of the footrest board is hinged to the front end of the third connecting rod, the rear end of the third connecting rod is hinged to the rear end of the fourth connecting rod, the front end of the fourth connecting rod is hinged to the front end of the seat rail, the rear end of the driving rod is hinged to the middle part of the swing connecting rod, and the front end is hinged to the middle part of the first connecting rod;

[0010] The backrest assembly is hinged to the rear end of the seat rail and the rear end of the swing link;

[0011] The rear end of the electric push rod is hinged to the base assembly, and the front end piston rod is connected to the triangular rotating plate, and can drive the triangular rotating plate to rotate around the hinge point between the triangular rotating plate and the inner mounting plate.

[0012] Preferably, the second connecting rod is provided with a first guide pin for the fourth connecting rod to abut against.

[0013] Preferably, the leg rest assembly further includes an intermediate leg rest plate, and the intermediate leg rest plate is arranged on the third connecting rod.

[0014] Preferably, a second guide pin is provided on the middle portion of the swing link, and a guide groove for the second guide pin to cooperate with is provided on the inner mounting plate.

[0015] Preferably, the front end of the inner mounting plate has a support pin for supporting the swing link and the drive link.

[0016] Preferably, the rear end of the electric push rod is hinged with a first connecting rod and is installed on two inner mounting plates through the first connecting rod. The front end piston rod of the electric push rod is hinged with a second connecting rod, and the end of the second connecting rod is fixedly connected to the triangular rotating plate.

[0017] Preferably, the backrest assembly includes a backrest connecting plate and a backrest support rod, the middle portion of the backrest connecting plate is hinged to the rear end of the seat rail, the lower end is hinged to the upper end of the backrest support rod, and the lower end of the backrest support rod is hinged to the rear end of the swing connecting rod.

[0018] The advantages of the present invention are as follows: the triangular rotating plate is driven to rotate by an electric push rod, thereby driving the leg rest assembly to extend or retract, the seat rail to swing forward and backward and up and down, and the backrest assembly to tilt forward and backward; when the extending device is in a sitting position, that is, in a fully retracted state, the leg rest assembly can be fully retracted on the bottom surface of the sofa base, the structure is compact, and the space occupied is small; and when the leg rest board is fully folded on the bottom surface of the sofa seat, it is convenient to clean the space at the bottom of the sofa. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional schematic diagram of a sofa mechanical extension device provided in this embodiment;

[0020] Figure 2 A left side view of the mechanical extension device for a sofa provided in this embodiment;

[0021] Figure 3 A right side view of the mechanical extension device for a sofa provided in this embodiment;

[0022] Figure 4 A schematic diagram of the expansion of the sofa mechanical extension device provided in this embodiment;

[0023] Figure 5 A schematic diagram of the fully deployed mechanical extension device for a sofa provided in this embodiment;

[0024] Figure 6 This is a schematic diagram of the sofa mechanical extension device provided in this embodiment being installed on a sofa chair. DETAILED DESCRIPTION

[0025] Combination Figures 1 to 6 The sofa mechanical extension device of the present invention is further described.

[0026] A mechanical extension device for a sofa is characterized in that it comprises a base assembly, a leg rest assembly, a seat assembly, a backrest assembly and an electric push rod 4.

[0027] The base assembly includes two outer mounting plates 1 arranged in parallel, a support rod 3 arranged between the two outer mounting plates 1, and two inner mounting plates 2 installed on the support rod 3 and located on the inner side of the outer mounting plates 1 (the accompanying drawing only shows one inner mounting plate); the support frame is fixed to the chair frame of the sofa chair by bolts.

[0028] The seat assembly includes a seat rail 10, a locking rod 8, a front connecting rod 7, a triangular rotating plate 6, a swing connecting rod 11, a rear connecting rod 12 and a supporting connecting rod 24; the rear end of the swing connecting rod 11 is hinged to the rear end of the inner mounting plate 2, the middle part can be slidably fitted on the inner mounting plate 2 up and down, the front end is hinged to the middle part of the locking rod 8, the upper end of the locking rod 8 is hinged to the rear part of the front end of the seat rail 10, the lower end is hinged to the front end of the front connecting rod 7, the rear end of the front connecting rod 7 is hinged to the rear end angle of the triangular rotating plate 6, the upper end angle of the triangular rotating plate 6 is hinged to the front end of the inner mounting plate 2, the front end of the supporting connecting rod 24 is supported by a pin rod 27 against the bottom wall of the swing connecting rod 11, the middle part is hinged to the front part of the rear end of the swing connecting rod 11, the rear end is hinged to the lower end of the rear connecting rod 12, and the upper end of the rear connecting rod 12 is hinged to the rear end of the seat rail 10. The legrest assembly includes a first connecting rod 15, a second connecting rod 16, a third connecting rod 17, a fourth connecting rod 18, a driving rod 9 and a legrest board 19; the front end of the first connecting rod 15 is hinged to the rear part of the front end of the seat rail 10, and the rear end is hinged to the rear end of the second connecting rod 16, the front end of the second connecting rod 16 is hinged to the upper end of the footrest, the middle part of the footrest is hinged to the front end of the third connecting rod 17, the rear end of the third connecting rod 17 is hinged to the rear end of the fourth connecting rod 18, the front end of the fourth connecting rod 18 is hinged to the front end of the seat rail 10, the rear end of the driving rod 9 is hinged to the middle part of the swing connecting rod 11, and the front end is hinged to the middle part of the first connecting rod 15. The backrest assembly is hinged to the rear end of the seat rail 10 and the rear end of the swing connecting rod 11. The rear end of the electric push rod 4 is hinged to the base assembly, and the front end piston rod is connected to the triangular rotating plate 6, and can drive the triangular rotating plate 6 to rotate around the hinge point between the triangular plate and the inner mounting plate 2.

[0029] Based on the above structure, when the extension device is in a retracted state, the electric push rod is in an extended state. In this state, the structures between the components are compact, which significantly reduces the area occupied on the bottom surface of the sofa seat, and the legrest can be completely folded on the bottom surface of the sofa seat. When the extension device needs to be unfolded, the electric push rod 4 is retracted, driving the lower part of the triangular rotating plate 6 to rotate forward, the triangular rotating plate 6 drives the front connecting rod 7 to move forward, the lower end of the locking rod 8 moves forward, and the upper end drives the seat rail 10 to move backward, the seat rail 10 drives the upper end of the first connecting rod 15 to move backward, and the lower end of the first connecting rod 15 moves forward, thereby linking the second connecting rod 16, the third connecting rod 17 and the fourth connecting rod 18 to unfold, and finally drives the legrest to be extended forward for the artificial leg to be placed.

[0030] It should be noted that, for the convenience of description, the front end, rear end, upper end or lower end mentioned in the above or below components are only used as an additional reference. Figure 1-3 The status shown is for reference only.

[0031] The second connecting rod 16 is provided with a first guide pin 23 for the fourth connecting rod 18 to abut against. During the unfolding and folding process, the fourth connecting rod 18 can abut against the first guide pin to ensure the stable unfolding and folding of the leg rest assembly.

[0032] The leg rest assembly also includes an intermediate leg rest plate 20, which is bolted to the third connecting rod 17. The intermediate leg rest plate can be used to support the lower leg of a human body, so as to further improve the comfort of the sofa chair in a lying position.

[0033] The middle part of the swing link 11 is provided with a second guide pin 22, and the inner mounting plate 2 is provided with a guide groove 21 extending up and down for the second guide pin 22 to cooperate with. Under this structure, the swing link 11 can be swung up and down, and the effect of the sofa seat plate sinking up and down can be achieved.

[0034] The front end of the inner mounting plate 2 has a support pin 28 for supporting the swing link 11 and the driving rod 9. The front end of the swing link 11 is supported by the support pin 28 and the second guide pin 22, which can improve the structural strength of the seat plate.

[0035] The rear end of the electric push rod 4 is hinged with a first connecting rod 5, and is installed on the two inner mounting plates 2 through the first connecting rod 5. A second connecting rod 26 is hinged on the front end piston rod of the electric push rod 4. The end of the second connecting rod is fixedly connected to the triangular rotating plate 6 by bolts. When the electric push rod is extended or retracted, it can pull the second connecting rod 26 to rotate, thereby driving the triangular rotating plate 6 to rotate.

[0036] The backrest assembly includes a backrest connecting plate 13 and a backrest support rod 14. The middle part of the backrest connecting plate 13 is hinged to the rear end of the seat rail 10, and the lower end is hinged to the upper end of the backrest support rod 14. The lower end of the backrest support rod 14 is hinged to the rear end of the swing link.

[0037] Unless otherwise specified, in the present invention, the terms "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in conjunction with the drawings and according to specific circumstances.

[0038] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A sofa mechanical extension device, characterized in that: It includes a base assembly, a leg rest assembly, a seat assembly, a backrest assembly and an electric push rod; The base assembly includes two outer mounting plates arranged in parallel, a support rod arranged between the two outer mounting plates, and an inner mounting plate installed on the support rod and located on the inner side of the outer mounting plates; The seat assembly comprises a seat rail, a locking rod, a front connecting rod, a triangular rotating plate, a swing connecting rod, a rear connecting rod and a supporting connecting rod; the rear end of the swing connecting rod is hinged to the rear end of the inner mounting plate, the middle part is slidably fitted on the inner mounting plate up and down, the front end is hinged to the middle part of the locking rod, the upper end of the locking rod is hinged to the rear part of the front end of the seat rail, the lower end is hinged to the front end of the front connecting rod, the rear end of the front connecting rod is hinged to the rear end angle of the triangular rotating plate, the upper end angle of the triangular rotating plate is hinged to the front end of the inner mounting plate, the front end of the supporting connecting rod is supported against the bottom wall of the swing connecting rod, the middle part is hinged to the front part of the rear end of the swing connecting rod, the rear end is hinged to the lower end of the rear connecting rod, and the upper end of the rear connecting rod is hinged to the rear end of the seat rail; The legrest assembly includes a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a driving rod and a legrest board; the front end of the first connecting rod is hinged to the rear part of the front end of the seat rail, and the rear end is hinged to the rear end of the second connecting rod, the front end of the second connecting rod is hinged to the upper end of the footrest board, the middle part of the footrest board is hinged to the front end of the third connecting rod, the rear end of the third connecting rod is hinged to the rear end of the fourth connecting rod, the front end of the fourth connecting rod is hinged to the front end of the seat rail, the rear end of the driving rod is hinged to the middle part of the swing connecting rod, and the front end is hinged to the middle part of the first connecting rod; The backrest assembly is hinged to the rear end of the seat rail and the rear end of the swing link; The rear end of the electric push rod is hinged to the base assembly, and the front end piston rod is connected to the triangular rotating plate, and can drive the triangular rotating plate to rotate around the hinge point between the triangular rotating plate and the inner mounting plate; A second guide pin is provided at the middle portion of the swing link, and a guide groove for the second guide pin to cooperate with is provided on the inner mounting plate; The rear end of the electric push rod is hinged with a first connecting rod and is installed on two inner mounting plates through the first connecting rod. The front end piston rod of the electric push rod is hinged with a second connecting rod, and the end of the second connecting rod is fixedly connected to the triangular rotating plate.

2. The mechanical stretching device for a sofa according to claim 1, characterized in that: The second connecting rod is provided with a first guide pin rod for the fourth connecting rod to abut against.

3. The sofa mechanical extension device according to claim 1, characterized in that: The leg rest assembly also includes an intermediate leg rest plate, and the intermediate leg rest plate is arranged on the third connecting rod.

4. The sofa mechanical extension device according to claim 1, characterized in that: The front end of the inner mounting plate is provided with a supporting pin for supporting the swing link and the driving link.

5. The sofa mechanical extension device according to claim 1, characterized in that: The backrest assembly includes a backrest connecting plate and a backrest support rod. The middle part of the backrest connecting plate is hinged to the rear end of the seat rail, the lower end is hinged to the upper end of the backrest support rod, and the lower end of the backrest support rod is hinged to the rear end of the swing connecting rod.

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