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    • 1. 发明专利
    • Improvements in and relating to expansion counter-boring bits
    • GB200173A
    • 1923-07-04
    • GB964922
    • 1922-04-04
    • WILLIE FRANKLIN WALL
    • B27G15/00
    • 200,173. Wall, 'W. F. April 4, 1922. Drills; augers.-An adjustable boring and counterboring bit for operating on wood has a tapered head adapted to engage the edge of a hole to be counterbored and support the bit. The head is formed with a semi-cylindrical part 3 and a semiconical part 4, the flat face a being in the same plane as the axis of the shank, and having lateral and longitudinal serrations 6 engaging similar serrations on the cutterblades 13. A lead-screw 7 and cutting-flange 8 are provided for boring. The cutter-blades are secured by a dove-tailed groove 9 and a sliding bolt 16, or by a serrated clamp and a screw engaging one of a line of holes in the face a. Two cutter-blades may be used as shown in the Figure, or one only may be used for counterboring a hole already drilled. A scale may ba provided on the tapered portion of the head for setting the counterboring blade to the correct diameter of hole, and the blades may also carry scales for setting the diameter of the cut.