A pilot bit according to claim 6 in which each said reinforcing rib is of approximately triangular cross-section.Ĩ. A pilot bit for an earth auger comprising a body having a top, said body having an upper portion which is triangular in side elevation viewed in one direction and narrow and substantially rectangular viewed rotated 90° and having blades at angularly spaced positions on the exterior of said body, each said blade originating at said top and extending downwardly in spiral shape of about 180° arcuate length on the outside of said body, each said blade having a leading face and a trailing face in the normal direction of rotation of said bit when said bit is digging in the earth, the projection of said blade outward gradually increasing as said blade extends downward, said blade extending below the apex of the triangle of said body in a fish-tail and formed with a cutting edge parallel to, but spaced outward of, a diameter of said body and a hard triangular reinforcing rib on said fish-tail extending up from said cutting edge centrally of the leading face of said fish-tail about one-half the overall height of said bit.ħ. A bit according to claim 4 in which another of said ribs is on the leading face of one said fish-tail and has its terminus on the trailing face of the next blade.Ħ. A bit according to claim 1 in which said one rib has its terminus on said cutting edge of said fish-tail.ĥ. A pilot bit according to claim 1 in which said body is formed with secondary blades on the exterior of said body, each said secondary blade originating on the outside edge of one of said first-mentioned blades partway down from said top, each secondary blade of spiral shape and gradually diverging at an angle rearward of said first-mentioned blade to which it is connected and increasing in projection from said body as said secondary blade extends downward and also increasing in distance behind said first-mentioned blade as said blades extend downwardly, said secondary blade extending below the apex of said body in a secondary fish-tail which joins at its bottom end with the outer corner of the cutting edge of the first-mentioned fish-tail of the first-mentioned blade opposite that to which said secondary blade is connected, said reinforcing ribs being located on the leading face of said first-mentioned blade.Ĥ. A bit according to claim 1 in which each said rib is approximately triangular in cross-section.ģ. A pilot bit for an earth auger comprising a body having a top, said body having an upper portion which is of an approximately inverted triangle shape in side elevation viewed in one direction and narrower and substantially rectangular viewed rotated 90° and having blades at angularly spaced positions on the exterior of said body, each said blade originating at said top and extending downwardly in spiral shape of about 180° arcuate length on the outside of said body, each said blade having a leading face and a trailing face in the normal direction of rotation of said bit when said bit is digging in the earth, the projection of said blade outward gradually increasing as said blade extends downward, said blade extending below the apex of the triangle of said body in a fish-tail and formed with a cutting edge parallel to, but spaced outward of, a diameter of said body, and a plurality of reinforcing ribs on said leading face of said blade, each said rib having an origin spaced inward of the outer edge of said blade and formed in a downwardly curving spiral and having a terminus on said outer edge.Ģ. Any reliance you place on such information is therefore strictly at your own risk.Īll official trademark data, including owner information, should be verified by visiting the official USPTO website at This site is not intended to replace professional legal advice and should not be used as a substitute for consulting with a legal professional who is knowledgeable about trademark law. The use of this site is at your own risk. While we strive to provide accurate and up-to-date information, we do not guarantee the accuracy, completeness, reliability, or suitability of the information displayed on this site. The information provided by uspto.report is based on publicly available data at the time of writing and is intended for informational purposes only. Uspto.report is an independent third-party trademark research tool that is not affiliated, endorsed, or sponsored by the United States Patent and Trademark Office (USPTO) or any other governmental organization.
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