Mechanical extension device for movable sofa

Abstract

The invention relates to a mechanical extension device for a movable sofa. The mechanical extension device comprises a left side part, a right side part, an opening and closing part and a self-lockingspring, the left side part is connected with the right side part through a fixing part, the opening and closing part is mounted on the left side part or the right side part, and the same footrest assembly plates, the same second leg connecting rods, the same assembly side plates, the same rotating parts, the same anti-twisting mounting parts, the same protective parts, the same backrest mountingplates, the same rear supporting connecting rods, the same bottom connecting rods, the same side connecting rod parts, the same self-locking connecting rod pars, the same fourth leg connecting rods, the same front mounting parts, the same first leg connecting rods, the same bent hook parts, the same front connecting rod parts, the same rear connecting rod parts, the same front rotating parts, thesame third leg connecting rods, the same transverse rod mounting parts and the same rear mounting parts are arranged on the left side part and the right side part. Components of the parts and connection and limitation between all the parts are both effectively designed, thus the structure is simpler, using strength is higher, a limit contact technology is optimized, and the using experience is optimized.

Description

technical field [0001] The invention relates to a mechanical stretching device for a movable sofa, in particular to a mechanical stretching device for a multifunctional movable sofa with legs that can be opened, folded or even extended, and the angle of the backrest can be adjusted at any angle. Background technique [0002] At present, the existing mechanical extension devices of movable sofas generally have three major deficiencies: 1. The lengths of unfolding and folding are inconsistent, resulting in the inability to open the iron frame or the collapse of the soft bag before sitting, which affects the appearance; 2. The process design of the parts is complicated, and the steps are too high. There are many connection points, and the limit method is complicated, which makes the overall structure of the mechanical stretching device too complicated, which leads to the complexity of the production process, which greatly increases the manufacturing cost of the mechanical stretc...

AI Technical Summary

Problems solved by technology

[0002] At present, there are generally three major deficiencies in the existing mechanical stretching devices for movable sofas: 1. The lengths of unfolding and folding are inconsistent, resulting in the failure of the iron frame to be opened or the collapse of the soft bag before sitting and affecting the appearance; 2. The process design of the parts is complicated, and the steps are too There are too many connection points, and the limit method is complicated, which leads to the overall structure of the mechanical stretching device is too complicated, which leads to the complexity of the production process, which greatly increases the manufacturing cost of the mechanical stretching device, and also reduces the operating time of the mechanical stretching device. 3. Due to the complexity of structural design, mechanical stretching devices of the same type and weight cannot meet the high-load test requirements in the fatigue test

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