Mechanical extension device for sofa

Abstract

The present invention discloses a mechanical extension device for a sofa, which is characterized in that it comprises a sofa chassis and a seat mechanism, a leg rest mechanism and a seat cushion installed on the sofa chassis; the seat mechanism comprises a seat cushion assembly slidingly matched on the sofa chassis, a backrest assembly hinged on the sofa chassis and linked with the seat cushion assembly, and a push rod motor driving the seat cushion assembly to move forward and backward and linking the backrest assembly to swing forward and backward; the leg rest mechanism slidingly matches on the sofa chassis and is located on the front side of the seat cushion assembly; the seat cushion comprises a leg rest part and a reclining part distributed front and back, the leg rest part is fixed on the leg rest mechanism, and the reclining part is fixed on the seat cushion assembly. The present invention is flexible to use, can be used alone, can be used in conjunction with a single sofa for a chaise position, and can be switched between various posture positions, and has the characteristics of simple structure and convenient installation.

Description

Technical Field

[0001] The invention relates to the technical field of sofas, and in particular to a mechanical extending device for a sofa. Background Art

[0002] With the development of society, people's pursuit of quality of life is constantly improving. When choosing furniture, consumers are no longer limited to a single function, but more hope to maximize the utilization rate of furniture, which is the modern thinking.

[0003] For example, for chairs or sofas, consumers are more looking for comfort, such as the ability to provide multiple usage modes such as normal sitting posture, leisure posture, full lying posture, etc., and with the continuous deepening of research and development, functional sofas that can achieve the above three posture switching have also appeared on the market. Although the functional sofas in the prior art can achieve the switching between the above three postures, they can only be used alone and realized through a full-link structure, resulting in their own structure and installation difficulty are relatively complicated, so there is room for further improvement. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a sofa mechanical extension device, which can be used alone or in conjunction with a single sofa for a chaise longue position, and can be switched between various posture positions, while also having the characteristics of simple structure and easy installation.

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

[0006] The mechanical extension device of a sofa is characterized by comprising a sofa frame and a seat mechanism, a leg rest mechanism and a cushion installed on the sofa frame;

[0007] The seat mechanism comprises a cushion assembly that slides forward and backward on the sofa chassis, a backrest assembly that is hinged on the sofa chassis and linked with the cushion assembly, and a push rod motor that drives the cushion assembly to move forward and backward and links the backrest assembly to swing forward and backward;

[0008] The leg rest mechanism is slidably engaged on the sofa chassis and is located at the front side of the seat cushion assembly;

[0009] The seat cushion comprises a leg rest portion and a lying portion which are distributed front and back. The leg rest portion is fixed on a leg rest mechanism, and the lying portion is fixed on a seat cushion assembly.

[0010] Preferably, the sofa chassis includes an armrest frame, a seat cushion slide rail fixed on the inner side of the armrest frame, a leg rest slide rail and a positioning plate.

[0011] Preferably, the seat cushion assembly includes a seat cushion plate for mounting the seat cushion portion, a slide plate connected to the seat cushion plate, and a seat cushion roller disposed on the slide plate, wherein the seat cushion roller cooperates with a seat cushion slide rail.

[0012] Preferably, the backrest assembly includes a first connecting rod, a second connecting rod and a third connecting rod; the lower end of the first connecting rod is hinged to the positioning plate; a connecting plate is fixed to the middle part of the second connecting rod, and the second connecting rod is hinged to the upper end of the first connecting rod through the connecting plate; the lower end of the second connecting rod is hinged to the upper end of the third connecting rod, and the lower end of the third connecting rod is fixed to the seat cushion plate.

[0013] Preferably, a rear motor tube fixed to the positioning plate is connected to the motor end of the push rod motor, and a front motor tube fixed to the slide plate is connected to the push rod end of the push rod motor.

[0014] Preferably, the leg rest mechanism comprises a leg rest support plate for mounting the leg rest portion and a leg rest roller disposed on the leg rest support plate, wherein the leg rest roller cooperates with the leg rest slide rail.

[0015] The advantages of the present invention are:

[0016] 1. The seat cushion is fitted on the sofa frame by sliding, which is simple in structure and easy to install compared to the full-link extension structure;

[0017] 2. The seat cushion assembly and the leg rest mechanism are split structures, so they can be used selectively, that is, the present invention can be used in conjunction with a single sofa for a chaise longue, or the leg rest mechanism can be removed and used alone, which has the characteristics of high flexibility of use and can also reduce the material used for the slide rail;

[0018] 3. The push rod motor can conveniently drive the seat cushion assembly and the leg rest mechanism to move forward and backward, and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the sofa mechanical extension device provided in this embodiment in a normal sitting position;

[0020] Figure 2 A schematic diagram of the sofa mechanical extension device provided in this embodiment in a lying state;

[0021] Figure 3 A schematic diagram of the seat mechanism provided in this embodiment in a normal sitting position;

[0022] Figure 4 This is a schematic diagram of the seat mechanism provided in this embodiment in a lying state. DETAILED DESCRIPTION

[0023] Combination Figures 1 to 4The sofa mechanical extension device of the present invention is further described.

[0024] A mechanical extension device for a sofa, characterized in that it comprises a sofa chassis 1, a seat mechanism, a leg rest mechanism 2, and a seat cushion 6 installed on the sofa chassis 1. The seat mechanism comprises a seat cushion assembly 3 that slides forward and backward on the sofa chassis 1, a backrest assembly 4 that is hinged to the sofa chassis 1 and is linked to the seat cushion assembly 3, and a push rod motor 5 that drives the seat cushion assembly 3 to move forward and backward and links the backrest assembly 4 to swing forward and backward. The leg rest mechanism 2 slides forward and backward on the sofa chassis 1 and is located at the front side of the seat cushion assembly 3; the seat cushion 6 comprises a leg rest portion 62 and a reclining portion 61 that are distributed forward and backward, the leg rest portion 62 is fixed to the leg rest mechanism 2, and the reclining portion 61 is fixed to the seat cushion assembly 3.

[0025] Specifically, the sofa chassis 1 includes an armrest frame 12, a leg rest rail 11, a seat cushion rail 13 and a positioning plate 14 which are fixed to the inner side of the armrest frame 12 by bolts and arranged in sequence from front to back, the armrest frame 12 is composed of an armrest 122 and a wooden frame 121, and the leg rest rail 11, the seat cushion rail 13 and the positioning plate 14 are all fixed to the wooden frame 121. The seat cushion assembly 3 includes a seat cushion board 32, a slide plate 33 connected to the seat cushion board 32, and a seat cushion roller 34 arranged on the slide plate 33, and the seat cushion roller 34 is matched with the seat cushion rail 13. In this embodiment, at least two seat cushion rollers 34 are provided to ensure the stability of the support of the seat cushion assembly 3.

[0026] The front and rear ends of the slide plate 33 are respectively provided with a front support arm 331 and a rear support arm 332, and the front support arm 331 and the rear support arm 332 are both fixed to the cushion plate 32 by screws. In order to make the front end of the cushion plate 32 slightly higher than the rear end, so as to improve the comfort of the normal sitting posture when the present invention is used as a single-function sofa, the height of the front support arm 331 is higher than the height of the rear support arm 332.

[0027] The positioning plate 14 has an inwardly bent retaining edge 141 , which is located at the rear end of the cushion slide rail 13 to limit the cushion roller 34 to the rear, thereby preventing the cushion roller 34 from rolling out from the rear end of the cushion slide rail 13 .

[0028] like Figure 3As shown, the backrest assembly 4 includes a first connecting rod 41, a second connecting rod 42 and a third connecting rod 43; the first connecting rod 41 is an L-shaped structure, and the lower end of the first connecting rod 41 is hinged to the rear end of the positioning plate 14; a connecting plate 421 is fixed to the middle part of the second connecting rod 42 by two screws, and the second connecting rod 42 is hinged to the upper end of the first connecting rod 41 through the connecting plate 421; the lower end of the second connecting rod 42 is hinged to the upper end of the third connecting rod 43, and the lower end of the third connecting rod 43 is fixed to the cushion plate 32 by multiple screws. Under the structure of the backrest assembly 4, the space occupied by the backrest assembly 4 can be reduced, and at the same time, the length of the second connecting rod 42 can be increased through the connecting plate 421 to increase the height of the backrest installation.

[0029] The motor end of the push rod motor 5 is connected to a rear motor tube 51 fixed to the positioning plate 14 through a hinge seat, and the push rod end of the push rod motor 5 is connected to a front motor tube 52 fixed to the slide plate 33 through a hinge seat. The leg rest mechanism 2 includes a leg rest support plate 21 and a leg rest roller 22 arranged on the leg rest support plate 21, and the leg rest roller 22 is matched with the leg rest slide rail 11. Similarly, at least two leg rest rollers are arranged on the leg rest support plate 21.

[0030] In this embodiment, the leg rest support plate 21 and the leg rest portion 62 are fixed by bolts, the cushion plate 32 and the sitting portion 61 are fixed by bolts, and the backrest cushion 44 is fixed to the second connecting rod 42 by screws.

[0031] When the present invention switches from a normal sitting position to a lying position, Figure 2 As shown in FIG. 3, the push rod motor 5 pushes the seat cushion plate 32 to move forward, and the third connecting rod 43 moves forward synchronously, driving the lower end of the second connecting rod 42 to swing forward, and the upper end of the second connecting rod 42 to swing backward and downward, and the upper end of the first connecting rod 41 to swing forward and downward, and the three connecting rods and a connecting plate 421 cooperate to form a support structure similar to an inverted U shape, that is, while laying the back cushion 44 flat, it plays a role of planar support for the back cushion 44, ensuring the comfort and stability of the back cushion support; when switching from the lying position to the normal sitting position, the above action can be reversed.

[0032] In specific implementation, the present invention can be used selectively, that is, the leg rest mechanism 2 on the front side is removed, and then a shorter wooden frame 121 is selected, and the length of the cushion 6 is shortened, that is, the leg rest portion 62 is saved, so that it can be used for a normal sofa for single use; on the contrary, the lengthened wooden frame 121 is selected, and the corresponding leg rest mechanism 2 is installed on the armrest frame 12, and finally the cushion with the leg rest portion 62 and the lying portion 61 is selected, so that it can be used as a chaise longue in conjunction with a single sofa. When used as a chaise longue, the armrest 122 on the armrest frame facing the side of the single sofa is removed. In the above process, since the leg rest mechanism 2 and the cushion assembly 3 are split structures, selective use is more convenient, that is, only the leg rest mechanism 2 needs to be selectively installed and the length of the corresponding components needs to be selectively used, and the convenience of installation can also be improved.

[0033] 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 accompanying 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 accompanying drawings and according to specific circumstances.

[0034] 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.

[0035] 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 sofa base frame and a seat mechanism, a leg rest mechanism and a seat cushion installed on the sofa base frame; The seat mechanism comprises a cushion assembly that slides forward and backward on the sofa chassis, a backrest assembly that is hinged on the sofa chassis and linked with the cushion assembly, and a push rod motor that drives the cushion assembly to move forward and backward and links the backrest assembly to swing forward and backward; The leg rest mechanism is slidably engaged on the sofa chassis and is located at the front side of the seat cushion assembly; The seat cushion comprises a leg rest portion and a lying portion distributed front and back, the leg rest portion is fixed on the leg rest mechanism, and the lying portion is fixed on the seat cushion assembly; The sofa base frame comprises an armrest frame, a seat cushion slide rail fixed on the inner side of the armrest frame, a leg rest slide rail and a positioning plate; The seat cushion assembly comprises a seat cushion plate for mounting the seat cushion portion, a slide plate connected to the seat cushion plate, and a seat cushion roller disposed on the slide plate, wherein the seat cushion roller is matched with the seat cushion slide rail; The backrest assembly includes a first connecting rod, a second connecting rod and a third connecting rod; the lower end of the first connecting rod is hinged to the positioning plate; a connecting plate is fixed to the middle part of the second connecting rod, and the second connecting rod is hinged to the upper end of the first connecting rod through the connecting plate; the lower end of the second connecting rod is hinged to the upper end of the third connecting rod, and the lower end of the third connecting rod is fixed to the seat cushion plate; The motor end of the push rod motor is connected to a rear motor tube fixed to the positioning plate, and the push rod end of the push rod motor is connected to a front motor tube fixed to the slide plate; The leg rest mechanism comprises a leg rest support plate for mounting the leg rest part and a leg rest roller arranged on the leg rest support plate, and the leg rest roller is matched with the leg rest slide rail.

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