Abstract: An accessory usable with a waterbed in a corner to facilitate the application and retention of bed clothes thereto which includes a rigid unitary hollow structure having two vertical substantially planar and triangular side walls disposed at right angles to each other and forming a pyramidal apex adapted to fit into a corner of a bed frame holding a waterbed bladder mattress, and a substantially planar and triangular support surface disposed to receive the weight of a corner of a mattress which pushes the accessory into a corner of a bed frame with bed clothes sandwiched between the side walls and the walls of a bedframe and lower edges of the side walls and a bottom of a bed frame. The bottom edge of the support surface is connected to the side wall bottom edges and define an open bottom communicating with the hollow therein.

Abstract: An accessory to be used with a waterbed to form a corner to facilitate the application of and retention of bed clothes thereto which includes a rigid structure having a bottom horizontal surface and two vertical side surfaces intersecting each other at right angles to form a pyramidal apex adapted to fit into the corner of a bed frame holding the waterbed bladder mattress, and a surface to receive the weight of a corner of the mattress tending to push the accessory into the corner of the bed frame with the bed clothes sandwiched between the bottom and side surfaces and the bed frame.