Bevelled washers or bevelled bosses as cast integrally on the extension govern the angle of the direction of the tooth relative to the bolt axis. The arms and extensions have holes to receive bolts which also pass through individual clamps which cooperate to retain teeth in position. ![]() An extension fits on each arm is telescopic fashion so that it can be held in various positions, thus determining the diameter. 175-292 14 Claims ABSTRACT OF THE DISCLOSURE An adjustable boring head for earth augers, particularly adapted for horizontal boring, has a hub with radial arms. BENETTI By WALTER L.STURGEON ATTORNEY United States Patent US. screw type bits Augers with leading portion or with detachable partsĪDJUSTABLE BORING HEAD FOR EARTH AUGERS Filed 3 Sheets-Sheet 5 IN V EN TOR.
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