Mechanical stretching device of movable sofa

A mechanical extension device of a movable sofa comprises a left side part, a right side part, a switching part and a locking spring (24), wherein the left side part and the right side part are fixedly connected by a fixing part, the switching part is mounted on the left side part or the right side part, and each of the left side part and the right side part is provided with a foot plate (15), a first foot rod (1), a second foot rod (14), a third foot rod (23), a fourth foot rod (3), a fifth foot rod (22), a side plate (9), a rotating shaft transmission part (4), a first connecting rod (16), a second connecting rod (20), a third connecting rod (12), a fourth connecting rod (21), a fifth connecting rod (26), a sixth connecting rod (25), a backrest part (8), a small foot plate (2), a first support part (13), a second support part (10), a linkage part (18), a protection part (11), a hippocampus part (19) and a bottom foot (17). According to the mechanical extension device, by designing parts ...