Cutting by use of rotating axially moving tool – Tool or tool with support – Having axial – core-receiving central portion
Patent
1991-04-15
1991-11-05
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having axial, core-receiving central portion
408209, B23B 5104
Patent
active
050627481
ABSTRACT:
A shank structure for holding an annular hole cutter used for drilling a large circular hole, comprising a hollow cylindrical body, a center drill inserted in the inner cavity of the body and clutch means for inhibiting and allowing relative motion between the body and the center drill. In normal or initial state, the body and the center drill are inhibited from their relative motion by the clutch means and, in drilling operation, a central guide hole is first drilled by the center drill. When the guide hole reaches a suitable depth, the clutch means is actuated to allow the relative motion between the body and the center drill and the center drill stops drilling and sinks into the inner cavity of the body. Then, the annular hole cutter secured to the body starts to drill a main hole and, upon completion of the main hole, the center drill is pushed out from the inner cavity by spring action and, at the same time, discharges a disc-shaped chip formed within the annular hole cutter. Accordingly, it gives such an advantage in that centering by the guide hole and discharge of the chip are effected automatically at the same time.
REFERENCES:
patent: 3609056 (1971-09-01), Hougen
patent: 4408935 (1983-10-01), Miyanaga
patent: 4555203 (1985-11-01), Takahashi
Fidelman Morris
Howell Daniel W.
ODSK Company, Limited
Wolffe Franklin D.
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