Woodworking – Rotary cutter – Cylindrical cutter having spiral bit
Patent
1978-10-13
1981-03-03
Bray, W. Donald
Woodworking
Rotary cutter
Cylindrical cutter having spiral bit
144117R, 144241, 407 63, B27C 100
Patent
active
042535069
ABSTRACT:
A rotary cutter is provided with a spiral plane bit which comprises a mounting plate extending spirally in the axial direction with a constant width, the mounting plate being made in such a manner that it is spirally cut out of a hollow cylinder with the inner radius of the mounting plate and a bit edge member extending also spirally along one lateral margin of the mounting plate and being fastened thereto, wherein there are provided a plurality of fastening holes arranged in the mounting plate in the longitudinal direction thereof, through which fastening elements extend radially into a plurality of threaded holes so as to fasten the mounting plate together with the said bit edge member on a rotary shank. This spiral plane bit is advantageously employed particularly for cutting wood material, because the spiral plane bit makes point contact with a workpiece of wood material and the contact point is displaced over the whole length of the spiral plane bit during cutting operation, resulting in smooth and uniform cutting with a less noise. The spiral bit edge is fastened to the mounting plate angularly displaceable so as to adjust the fastening position thereof.
REFERENCES:
patent: 19035 (1858-01-01), Mallary
patent: 107943 (1870-10-01), More
patent: 512463 (1894-01-01), Bechtol
patent: 567545 (1896-09-01), Munch
patent: 811768 (1906-02-01), Forbes
patent: 841439 (1907-01-01), Plue
patent: 909122 (1909-01-01), Roussell
patent: 2782489 (1957-02-01), Hargrove et al.
patent: 4074737 (1978-02-01), Stewart
patent: 4131146 (1978-12-01), Koch
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