Patent for a new and improved bedstead attachment. This design consists in "[t]he combination, with the side rails and head and foot boards, of the plates having angular projections provided with wedge-shaped grooves and small inclined recesses at their upper parts, and the plates having the tapering wedge-shaped projections provided with the lugs integrally formed with their upper portions and adapted to engage the recesses, whereby when the projecting engaging portions of the plates . . . wear and become loose they are prevented from disjointure by the engagement of the lugs" (lines 83-94).