Perspective drawing device and combination of perspective and parallel drawing device

Claim 1

A DRAWING DEVICE AT LEAST FOR PERSPECTIVE DRAWING COMPRISING BASE MEANS, A SINGLE PIVOTAL ARM, ARM PIVOT MEANS HAVING A VERTICAL AXIS AND PIVOTALLY MOUNTING THE ARM ON THE BASE MEANS, A LEVER, LEVER PIVOT MEANS HAVING A VERTICAL AXIS AND PIVOTALLY MOUNTING THE LEVER ON THE ARM AT A POINT SPACED FROM THE ARM PIVOT MEANS INCLUDING A LEVER PIVOT MOUNTED ON THE ARM, AN OPERATING CONNECTION BETWEEN THE BASE MEANS AND THE LEVER TO MAINTAIN THE LEVER IN THE SAME RELATIVE ANGULAR POSITION WITH RESPECT TO THE BASE MEANS THROUGHOUT THE PIVOTAL MOVEMENT OF THE ARM INCLUDING A FIRST FIXED MEMBER SECURED TO THE LEVER AND A SECOND FIXED MEMBER SECURED TO THE BASE MEANS, AND A CONNECTING LINKAGE BETWEEN THE FIXED MEMBERS; RULING EDGE MEANS INCLUDING A RULING EDGE MEMBER HAVING A RULING EDGE, THE RULING EDGE MEANS BEING PIVOTALLY MOUNTED ON THE LEVER PIVOT, AND THE RULING EDGE BEING IN ALIGNMENT WITH THE AXIS OF THE LEVER PIVOT; AND RULING EDGE CONTROL MECHANISM INCLUDING A CONTROL PIVOT FRAME, CONTROL FRAME PIVOT MEANS PIVOTALLY MOUNTING THE CONTROL FRAME ON THE LEVER AT A POINT SPACED FROM THE LEVER PIVOT MEANS AND HAVING A CONTROL FRAME PIVOT WITH A VERTICAL AXIS, A FIRST CONNECTING MEMBER FIXED TO THE ARM AT THE LEVER PIVOT, A SECOND CONNECTING MEMBER SECURED TO THE CONTROL FRAME, A CONNECTING LINKAGE BETWEEN THE CONNECTING MEMBERS, A CONTROL PIVOT MEANS HAVING A VERTICAL AXIS AND CARRIED BY THE CONTROL FRAME, THE CONTROL PIVOT MEANS INCLUDING A CONTROL PIVOT HAVING A VERTICAL AXIS LOCATED ON A LINE EXTENDING FROM THE AXIS OF THE LEVER PIVOT MEANS AND VERTICAL TO A LINE BETWEEN THE AXES OF THE ARM PIVOT MEANS AND THE LEVER PIVOT MEANS WHEN THE LEVER IS VERTICAL TO A LINE BETWEEN THE AXES OF THE ARM PIVOT AND THE LEVER PIVOT, GUIDE MEANS CARRIED BY THE CONTROL PIVOT HAVING ITS AXIS AT RIGHT ANGLES TO THE AXIS OF THE CONTROL PIVOT, AND CONTROL ROD MEANS SECURED TO THE RULING EDGE MEANS AND EXTENDING AT RIGHT ANGLES TO THE RULING EDGE AND SLIDABLY RECEIVED BY THE GUIDE MEANS CARRIED BY THE CONTROL PIVOT MEANS.