Combination bit and manufacturing technique for forming...

Details Combination bit and manufacturing technique for forming... Combination bit and manufacturing technique for forming...

B - Operations, Transporting

23

B

77/31

B23B 51/00 (2006.01) B23B 51/04 (2006.01)

Patent

CA 1230763

ABSTRACT OF THE DISCLOSURE A novel combination bit as well as novel manufacturing technique are provided herein. The bit is specially designed to form, in a single operation, a substantially cylindrical plug having a central aperture, and complex rounded faces consisting of a cylindrical face and a coextensive frusto-conical face. The combination bit includes an arbor and a blade arrangement in the form of an inverted cup secured to the arbor. The in- verted cup has an upper plate and a depending rim, the depending rim of the inverted cup being provided with a small plurality of cutting teeth equally spaced therearound. Each cutting tooth has a swept-back forward edge, and a swept-back trailing edge. Each cutting tooth has a lower cutting face of sufficient depth to provide a cylindrical face of the desired height on the plug formed, and an upper cutting face of sufficient size disposed on the forward edge to provide a frusto-conical face of the desired height on the plug being formed. A central bit is concentrically disposed within the inverted cup and is secured to the upper plate of the cup to provide the central aperture in the plug being formed. The novel manufacturing technique involves cutting out the plug of the particular shape which may have a dia- meter ranging from 1" to 24" in a single step using the novel combination bit.

474049

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