Patent attributes
A freestanding single-motor-driven mechanical extension device includes a base. Left and right sides of the base are respectively pivotally connected to an extension assembly. The extension assembly includes a base plate linkage mechanism, a leg extension mechanism and a backrest mechanism. The base plate linkage mechanism includes a front mounting member and a rear mounting member. One end of the front mounting member is pivotally connected to the front part of the base, and the other end of the front mounting member is pivotally connected to a first front rotating member. The other end of the first front rotating member is pivotally connected to a mounting side plate. The middle part of the front mounting member is pivotally connected to a second front rotating member. The other end of the second front rotating member is pivotally connected to the middle part of the mounting side plate.
