Patent ID: 7806394

Claim:
A clamping device for holding generally planar workpieces in an upright position comprising: a symmetrical frame with a gap accessible from the top and sides of said frame for the insertion of said workpieces; two bars with a generally square cross-section that serve to clamp a planar workpiece such as a door, panel, window, or plasterboard in an upright position; at least one of said bars are moveable perpendicularly to the plane of said workpiece; the force of clamping is generated by the weight of said workpiece; the weight of said workpiece generates clamping via utilization of a catch strap which is attached to the bottom of said bars; an elastic member or plurality thereof generates the force necessary to hold said bars apart via a pivoting lever when said flexible catch strap is not engaged with said workpiece; and said pivoting lever is attached to the top of said clamping bar on the end proximal to the workpiece and attached to said elastic member on the end distal to the workpiece with the pivot point in the middle of said lever and there forming an attachment with said frame.