Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1991-03-05
1991-12-24
Howell, Daniel W.
Metal working
Method of mechanical manufacture
Assembling or joining
29525, 761086, 279103, 408226, 408239A, B23P 1532, B23B 5102
Patent
active
050740253
ABSTRACT:
A combination drill and drill adapter comprises a drill having a shank portion for mounting the drill, and an adapter having an opening for receiving the drill. The drill shank is generally cylindrical in shape and, at a portion adjacent to an end of the drill, includes a plurality of substantially flat sides parallel to the longitudinal axis of the drill extending along at least a portion of the shank. The drill adapter opening has a depth greater than the length of the flat sides of the drill for receiving the drill shank end portion. A mounting member is at the opposite end for mounting the adapter in a drilling device. The adapter opening has a first diameter at the portion of the opening away from the end less than the diameter of the drill shank cylindrical portion and greater than that of the diameter of a circle tangential to the sides at the end of the drill shank, and a second diameter at the portion of the opening adjacent the end greater than the first diameter and slightly less than that of the drill shank cylindrical portion. The drill shank end is assembled into the adapter opening such that the sides of the drill shank end broach walls of said adapter opening at the first diameter away from the adapter end and the drill shank cylindrical portion fits against walls of the adapter opening at the second diameter adjacent to the adapter end without broaching to hold the drill securely in the adapter for mounting of the assembled drill and adapter in a drilling device.
REFERENCES:
patent: 3053118 (1962-09-01), Lavallee
patent: 3589826 (1971-06-01), Fenn
Machine Design: Theory and Practice, Macmillan Publishing Co., Inc., 1975, pp. 98 and 870.
Tool and Manufacturing Engineers Handbook, vol. 1, Machining, SOciety of Manufacturing Engineers, 1984, pp. 3-6 and 3-7.
Howell Daniel W.
Jarvis Cutting Tools, Inc.
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