An erectable structure truss attachment joint includes a first truss having a casing containing a piston between a flange on the end of the casing and a wedge threadably mounted on an adjustment screw inside the casing. A tension rod passing through the wedge and the piston has a knob extending out of...http://www.google.com/patents/US4955742?utm_source=gb-gplus-sharePatent US4955742 - Erectable structure truss attachment joint
