Abstract: A detachable coupling is provided to interconnect a horizontally disposed bed support rail to an upright bedpost. The ends of the bedrail are provided with vertically oriented, channel-shaped feet or pegs. Each such downward projection has a web extending transversely across the end of the bedrail and side walls secured to both sides of the bedrail. The foot depends from the bedrail end and the width of the side walls diminishes with distance from the bedrail, whereby the side walls are not quite rectangular, but are actually of trapezoidal shape. A vertically oriented, channel-shaped pocket is secured to the bedpost at each of the detachable coupling positions. The pocket has a web spaced outwardly from the bedpost and side walls secured to the bedpost. The pocket has a draft that conforms to the shape of the foot so as to snugly receive the foot therewithin. A transverse locking screw engages both the foot and the pocket so as to immobilize the foot within the pocket.