Shearproof metal punch

Claim 1

IN A PRESS, RELATIVELY RECIPROCABLE MALE AND FEMALE DIES, MEANS ON ONE OF SAID DIES TO RECEIVE FED WORK, A FIRST ONE OF SAID DIES HAVING A PLURALITY OF APERTURES SPACED FORWARDLY AND REARWARDLY OF THE DIE IN THE DIRECTION OF WORK FEED WITH THEIR AXES EXTENDING PARALLEL TO EACH OTHER IN THE DIRECTION OF THE DIE RECIPROCATIONS, A SUBSTANTIALLY CYLINDRICAL GUIDE PIN INDEPENDENTLY SLIDABLY MOUNTED IN EACH OF SAID APERTURES, SPRING MEANS DISPOSED IN EACH SAID APERTURE INWARDLY OF THE GUIDE PIN THEREIN FOR RESILIENTLY URGING THE LATTER OUTWARDLY TOWARD THE SECOND SAID DIE AND ENABLING RETRACTION OF THE ASSOCIATED GUIDE PIN INTO ITS APERTURE WHEN MOVEMENT THEREOF WITH SAID FIRST DIE IS ARRESTED BY A WORK PIECE INTERPOSED BETWEEN SAID DIES, SAID SECOND DIE HAVING APERTURE MEANS SPACED COMPLEMENTARY TO SAID FIRST MENTIONED APERTURES FOR RECEIVING SAID GUIDE PINS, WHEN THE LATTER ARE NOT ARRESTED BY A WORK PIECE, TO PREVENT OUTWARD MOVEMENT OF SAID DIES RELATIVE TO EACH OTHER TRANSVERSELY OF THE DIRECTION OF SAID RECIPROCATIONS.