公开(公告)号：US3714690A

公开(公告)日：1973-02-06

申请号：US3714690D

申请日：1969-09-30

申请人： PARENTI J

发明人： PARENTI J

IPC分类号： B23B51/05 ,  B26F1/16 ,  C14B5/00 ,  B26D1/12

CPC分类号： B26F1/16 ,  B23B51/05 ,  C14B5/00 ,  C14B2700/116 ,  Y10T408/86 ,  Y10T408/8953

摘要： A ROTATIVE HOLE CUTTING DEVICE FOR A HEAVY, SOMEWHAT SOFT, RESILIENT, FABRIC-LIKE MATERIAL IN THE NATURE OF BELTING IS PROVIDED WITH A FORWARDLY-EXTENDING DRILL STEM THAT FIRST ENTERS THE MATERIAL, AND WITH A PAIR OF OPPOSED, ESPECIALLY-CONSTRUCTED AND POSITIONED KEY-LIKE CUTTER ELEMENTS THAT FOLLOWS THE DRILL STEM AND QUICKLY AND EFFICIENTLY CUT-

OUT A CIRCULAR HOLE IN THE MATERIAL. THE DRILL STEM SERVES TO GUIDE MOVEMENT OF THE CUTTER ELEMENTS AND TO RETAIN THE PART OR FRAGMENT BEING CUT-OUT IN POSITION UNTIL THE COMPLETION OF THE OPERATION.