When the auger is rotated in a digging direction, the shape of the extension holder is such that the tooth is projetced outwardly beyond the confines of the auger head and thus the hole dug is of a diameter greater than that of the auger head. A tooth is held by the extension disposed in a different plane from the teeth which have been described and which are attached to the extension itself. The hub attachment also holds a pair of teeth.Īnother important feature of the invention is the fact that an expansion tooth holder is pivotally mounted adjacent the top of the outer end of at least one extension. A hub attachment fits into the hub and holds an elongated pilot gimlet which assists in holding the direction of the hole true. The same clamp and tooth are used on the expansion holder as on the extension. An expansion holder is pivotally mounted on the top of at least one extension and is shaped so that when the auger is rotated in digging direction the expansion holder pivots outward so that the tooth held thereby digs the outside of the hole and when the auger is reversed pivots inwardly to reduce the overall diameter of the head. 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. E21B10/44- Bits with helical conveying portion, e.g.DEEP DRILLING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US73690568A external-priority Application filed by Pengo Corp filed Critical Pengo Corp Application granted granted Critical Publication of US3508622A publication Critical patent/US3508622A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee Pengo Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Inventor John G Benetti Walter L Sturgeon Current Assignee (The listed assignees may be inaccurate. Google Patents Adjustable boring head for earth augersĭownload PDF Info Publication number US3508622A US3508622A US3508622DA US3508622A US 3508622 A US3508622 A US 3508622A US 3508622D A US3508622D A US 3508622DA US 3508622 A US3508622 A US 3508622A Authority US United States Prior art keywords extension arm head tooth auger Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3508622A - Adjustable boring head for earth augers US3508622A - Adjustable boring head for earth augers
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