Drawing board for steel rule dies

Claim 1

A DRAWING BOARD FOR STEEL RULE DIES COMPRISING TWO STRAIGHT EDGES DISPOSED AT RIGHT ANGLES TO EACH OTHER AND ADJUSTABLY MOUNTED ON A PERFORATED BASE ADAPTED TO ACCOMMODATE A FOUR-SIDED WORKPIECE SO THAT TWO SIDES OF SAID WORK-P;IECE ARE IN CONTACT WITH SAID STRAIGHT EDGES, SECURING MEANS RESPECTIVELY MANUALLY OPERABLE TO MOUNT THE STRAIGHT EDGES TO SAID PERFORATED BASE IN ADJUSTABLE POSITION WITH RESPECT TO SAID PERFORATED BASE, SAID BASE HAVING A PLURALITY OF EQUALLY SPACED APERTURES, PRESSURE RESPONSIVE LOCKING MEANS FOR HOLDING A WORKPIECE IN POSITION ON SAID DRAWING BOARD, SAID PRESSURE RESPONSIVE LOCKING MEANS BEING MOVABLE AND ADJUSTABLY SECURED TO SAID BASE, A STUD PIN FORMING A PART OF SAID PRESSURE RESPONSIVE LOCKING MEANS AND OPERABLE FOR MANUALLY MOVABLY AND ADJUSTABLY SECURING SAID PRESSURE RESPSONSIVE MEANS TO SAID BASE AND HAVING PORTIONS THEREOF ADAPTED TO BE RECEIVED INTO ONE OF SAID EQUALLY SPACED APERTURES IN SAID BASE, SAID PRESSURE RESPONSIVE LOCKING MEANS COMPRISING A BODY HAVING CURVED END REGIONS AND A FLAT SIDE IN OPPOSED RELATION TO THE CURVED END REGIONS, SAID BODY HAVING A RECESSED CHANNEL HAVING A PLURALITY OF THROUGH APERTURES DISPOSED THEREIN AND ADAPTABLE TO ACCOMMODATE ASAID STUD PIN, A PAIR OF STUDS DISPOSED IN SPACED RELATIONSHIP AND WITH PORTIONS THEREOF PROJECTING FROM THE FLAT SIDE OF SAID BODY AND AXIALLY MOVABLE IN RELATION TO SAID BODY RESPONSIVE TO MANUAL PRESSURE, SEPARATE SPRING MEANS DISPOSED WITHIN SAID BOLDY AND IN ENGAGEMENT WITH A RESPECTIVE STUD TO PROVIDE A RESILIENT FORCE URGING SAID STUDS AXIALLY OUTWARDLY OF SAID BODY SO THAT END PORTIONS THEREOF ARE IN ENGAGEMENT WITH A SIDE OF SAID WORKPIECE TO EXERT RESILIENT PRESSURE THEREON TO MAINTAIN AN OPPOSED SIDE OF SAID WORKPIECE IN CONTACT WITH AN ADJACENT STRAIGHT EDGE, AND EACH OF SAID STUDS HAVING MEANS RESPECTIVELY COOPERATING WITH PORTIONS OF SAID BODY TO LIMIT THE AXIAL OUTWARD MOVEMENT OF SAID STUDS WITH RESPECT TO SAID BODY.