摘要 |
A punch assembly comprising a cylindrical clamper holder, a ram reciprocatingly movable therein and having an axial bore, a punch carried on said ram, a pair of clampers pivotally mounted on the clamper holder and releasably holding a fastening element, a pair of washers received in a lateral slot in the clamper holder and resiliently urged against the ram by means of springs, and a bolt-and-nut unit extending transversely through the axial bore of the ram and fastening the springs and the washers together. |