US Patent 11172759 Diamond-shaped folding rack

A diamond-shaped folding rack includes a left side frame, a right side frame, a folding layer plate, a linkage vertical rod, and a locking mechanism. The folding layer plate is axially connected to the left and right side frames. The linkage vertical rod is provided at a folding junction of the folding layer plate. The linkage vertical rod moves up to allow the folding layer plate to fold upward; the linkage vertical rod moves down to allow the folding layer plate to unfold downward and horizontally.