Paper perforating device

A punch device for providing holes in sheet material, and comprising;

• an elongated, substantially flat die plate formed of substantially rigid, hard, polymeric material and having a plurality of holes therethrough predeterminedly spaced from one another and disposed along a first linear axis;
• an elongated, substantially flat punch plate also formed of substantially rigid, hard polymeric material and having a plurality of teeth projecting therefrom in said predetermined spacing and disposed along a second linear axis;
• means, formed of polymeric material, for rotatably hinging said two plates together along respective edges thereof so that holes and teeth are in fixed registration with one another and so that no discernible relative axial displacement or travel of said two plates is permitted, said means comprising a plurality of elongated posts fixed to at least one of said plates, and a like plurality of corresponding tubular sockets fixed to the other of said plates, said posts and sockets being so arranged that said posts extend colinearly with one another into respective ones of said sockets and said sockets are rotatable about said posts, said means being so dimensioned and constructed that when said posts are fully extended within said sockets, said posts and sockets cannot be disengaged without seriously damaging said hinging.