US Patent 11006763 Adjustable metal bed frame assembleable without using bolts

An adjustable bed frame includes first and second bed frame units. The first bed frame unit includes a first longitudinal rod, a second longitudinal rod, a first transverse rod, and a first vertical rod. The first longitudinal rod, the second longitudinal rod, and the first transverse rod are all pivotally attached to the first vertical rod. A locating hole passes through a side of the first transverse rod. The second bed frame unit includes a third longitudinal rod, a fourth longitudinal rod, a second transverse rod, and a second vertical rod. The third longitudinal rod, the fourth longitudinal rod, and the fourth transverse rod are all pivotally attached to the second vertical rod. A locating pin is disposed on a side of the second transverse rod. In an assembled state, the second transverse rod fits inside the first transverse rod, and the locating pin protrudes out through the locating hole.