Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1975-02-10
1976-06-08
Whitehead, Harold D.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
5116572, B24B 326
Patent
active
039614506
ABSTRACT:
The present invention relates to hand-held, portable twist drill sharpening devices. In the embodiment described the twist drill is placed in a holder and aligned with an optical indicating device for sharpening by a hand-held, flat surfaced sharpening stone. The holder is formed by two V-shaped clamping pieces that position the twist drill with respect to the holder apex angle and roof line. The optical indicating device includes an index member and means for positioning the index member with respect to the holder roof line at the predetermined angle for the drill cutting edge. When the index member is positioned, the twist drill cutting edge is aligned with it. The twist drill is positioned lengthwise and is already for sharpening each cutting edge without further adjustment, by moving the sharpening stone along the end faces of the clamping pieces. The optical indicating device is arranged for alignment while being hand held, or mounted on the clamping pieces to align the index member with respect to the roof line. The optical indicating device can be guided for a small distance while being separated from the holder, to maintain its alignment.
REFERENCES:
patent: 2040978 (1936-05-01), Cogsdill
patent: 2455562 (1948-12-01), Crowther
patent: 2821820 (1958-02-01), Thumann
patent: 3022609 (1962-02-01), Abadjieff
Fryer III William T.
Whitehead Harold D.
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