Demountable drawing board support frame - has six-piece trestle with four bolted spigot and socket joints and allows for variation of height and slope

摘要

The collapsible drawing board support frame is of tubular members adjustable for variation of both the board height and inclination. The frame breaks down into a number of small components which occupy little volume for storage or transport. Member connections include bolted spigot and socket joint, cotter pinned telescopic joints and simple pin-joints. The support frame feet are made up from six pieces with four bolted joints and may take the form of cross-braced inverted 'Y' frames. The legs have telescopic upper extension pieces which are fixed by cotter pins in member holes. The board support transomes are pinned to the top of the leg extension members and braced by pin-jointed stays to the static lower leg lengths.