Picture frame with connections joining it to stretcher - has outer, overlapping, behind or U=shaped member to tighten canvas

摘要

The connections (3,3') are parallel to the plane along which the stretcher is tightened. The picture frame has three or more corners to take the stretcher. The canvas is tightened and the stretcher thereby forced apart by means of pressure or tension. The picture frame is externally spaced apart from, or overlaps, the stretcher. It may be U-shaped to take the stretcher, or is behind the stretcher. USE/ADVANTAGE - The stretcher can easily be tightened and subsequently joined to the picture frame.