Angle-adjustable backrest frame

Abstract

This item is a backrest frame with an angle adjustment function, and the basic drawing shows it in a folded state for convenient storage. When in use, the backrest (outer rectangular frame) is fixed at the user's desired angle, and the inner approximately trapezoidal frame maintains the contact surface, stabilizing the backrest as the angle changes and preventing it from tipping over. In order to fully fulfill the function of this item and make it as light and strong as possible, the outer frame is rectangular and the inner frame is approximately trapezoidal.

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