Self sustaining paper punch frame assembly

Claim 1

A PUNCH, COMPRISING TWO U-SHAPED MEMBERS, EACH HAVING U-LEGS CONNECTED BY A BASE, ONE OF SAID U-MEMBERS HAVING ITS BASE PROVIDED WITH A TONGUE-RECEIVING APERTURE AT A SPACED DISTANCE ABOVE ITS LOWER U-LEG AND THE OTHER OF SAID U-MEMBERS HAVING ITS LOWER U-LEG PROVIDED WITH A FORWARDLY-PROJECTING TONGUE, THE LOWER U-LEGS OF SAID MEMBERS BEING PROVIDED WITH LARGE OPENINGS AND SAID UPPER U-LEGS OF SAID MEMBERS BEING PROVIDED WITH INTER-LOCKING PINS AND PIN RECESSES, SAID PIN RECESSES SNUGLY RECEIVING SAID PINS THEREIN, SAID FORWARDLY-PROJECTING TONGUE BEING SNUGLY RECEIVED WITHIN SAID APERTURE FOR SUPPORTING THE UPPERMOST OF THE LOWER U-LEGS AT A SPACED DISTANCE ABOVE THE LOWER U-LEG OF THE OTHER MEMBER, SAID LOWER U-LEG OF SAID OTHER MEMBER HAVING SHOULDERS ADJACENT SAID TONGUE ENGAGING THE BASE OF SAID ONE MEMBER ADJACENT SAID APERTURE, SAID U-MEMBERS HAVING THEIR UPPER U-LEG OVERLAPPING AND IN SURFACE ENGAGEMENT WITH EACH OTHER AND PROVIDING WITH ALIGNED SMALL OPENINGS, SAID U-MEMBERS THEREBY PROVIDING A SELF-SUSTAINING FRAME ASSEMBLY, A HEAD-EQUIPPED PUNCH HAVING AN UPPER REDUCED PORTION RECEIVED WITHIN SAID ALIGNED OPENINGS IN SAID UPPER U-LEGS AND A LOWER ENLARGED PORTION RECEIVED WITHIN THE OPENINGS IN THE LOWER U-LEGS OF SAID MEMBERS, SAID APERTURED BASE HAVING A PORTION THEREOF BETWEEN THE LOWER U-LEGS OF SAID MEMBERS DEFINING A BACK GAUGE FOR LIMITING THE EXTENT OF INSERTION OF SHEET MATERIAL BETWEEN SAID LOWER LEGS, AND A SPRING BETWEEN THE UPPER LEGS OF SAID MEMBERS AND SAID PUNCH HEAD URGING SAID PUNCH TO AN ELEVATED POSITION.