Blind-taper hole saw

Details Blind-taper hole saw Blind-taper hole saw

B - Operations, Transporting

23

B

B23B 41/06 (2006.01) B23B 41/02 (2006.01) B23B 51/04 (2006.01) B26D 1/43 (2006.01)

Patent

CA 2255273

A rotary tool for forming a blind-tapered hole in a workpiece includes an elongate shaft having a bit shank on one end and a base plate secured to the other end. A collar, mounted for axial movement on the shaft, is biased away from the base plate to a first position on the shaft by a return spring. At least two cutting blades are pivotally attached to the collar. A portion of the length of each cutting blade is fixedly circumferentially and radially supported relative to the shaft by a blade guide that rotates with the shaft such that the angle formed between each cutting blade and the shaft's rotational axis increases with increasing axial displacement of the collar on the shaft away from the first position.

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