Mechanical stretching device for sofa

Abstract

The invention discloses a mechanical stretching device for a sofa. The mechanical stretching device comprises a base assembly, a leg placing 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 leg placing assembly comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a driving rod and a leg placing plate; the front end of the firstconnecting rod is hinged to the rear part of the front end of the seat rail, the rear end is hinged with the rear end of the second connecting rod; the front end of the second connecting rod is hinged to the upper end of the leg placing plate, the middle of the leg placing plate is hinged to the front end of the third connecting rod, the rear end of the third connecting rod is hinged to the rearend 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 of the swing connecting rod, and the front end of the driving rod is hinged to the middle of the first connecting rod. The rear end of the electric push rod is hinged to the base assembly. A front-end piston rod is connected with the triangular rotating plate. The device has the characteristic of simple and compact structure.

Description

technical field [0001] The present invention relates to the field of sofa manufacture, and more specifically relates to a sofa mechanical stretching device. Background technique [0002] As a household item, a sofa includes a backrest, a main body, and feet. In order to realize the rotation of the backrest and the feet of the existing sofa to facilitate the human body to lie down, a motor and a transmission device are often provided to adjust the inclination angle of the sofa backrest, as well as the extension length and height of the sofa feet, which facilitates the use of the sofa and the lifting of the sofa by the user. the comfort of use. [0003] However, the transmission device in the prior art still has defects. For example, the patent document with the publication number CN206543070U discloses a sofa, which includes a sofa body and a sofa support that is connected with the sofa body. The sofa body includes an external fixed seat, an armrest, and a cushion , lumbar ...

AI Technical Summary

Problems solved by technology

[0003] However, the transmission device in the prior art still has defects. For example, the patent document with the publication number CN206543070U discloses a sofa, which includes a sofa body and a sofa support that is connected with the sofa body. The sofa body includes an external fixed seat, an armrest, and a cushion , lumbar support, footrest and backrest; it is characterized in that: the outer fixed 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; Footrest assembly, fixed base, push rod, first link assembly, second link assembly and third link assembly; armrest is fixed on top of side wall; fixed base is fixed on bottom plate; backrest assembly is fixed on inner backrest Up; the push rod moves under the drive of the motor

In this technical solution, the structure of the entire transmission device is relatively complicated, and it occupies a large space at the bottom of the sofa, resulting in a small space at the bottom of the sofa. On the other hand, when the components are in the retracted state, the footrest can only shrink to the vertical state. And it is 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

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