A collapsible sawhorse unit that, when unfolded and combined with a replaceable crosspiece, produces a sturdy and economical sawhorse. The unit includes the two A-shaped end pieces, of two legs each, that fold toward each other with the legs of each end piece folding toward each other. A folding upper...http://www.google.com.au/patents/US5297655?utm_source=gb-gplus-sharePatent US5297655 - Collapsible sawhorse
