| Patent Number |
Title Of Patent |
Date Issued |
| 5476149 |
Pilot bit |
December 19, 1995 |
| A pilot bit is provided with an elongated body member and three blades that extend radially from and spirally along the body member. As compared to conventional two bladed pilot bits, the outer edge and leading tip of the third blade removes additional spoil which increases penetration r |
| 5433033 |
Excavating tooth and shank plate assembly |
July 18, 1995 |
| An excavating tooth includes an aperture for bolting the tooth to a shank plate and a lug configured to provide a friction fit in a recess formed in the shank plate. The bolt and lug combination prevent relative movement between the tooth and shank plate. In addition, tooth load is absor |
| 5427191 |
Auger head assembly and method of drilling hard earth formations |
June 27, 1995 |
| An auger is provided with a boring head having an arrangement for cutting relatively hard earth formations such as rock. First and second groups of drill bits are mounted to the boring head such that when the head is rotated, each bit in those groups cuts a different path at a different |
| 5426875 |
Reversible tooth with adjustable attack angle |
June 27, 1995 |
| A reversible tooth includes alternate surfaces mounting to a shank plate. The surfaces are constructed so that the attack angle of the tooth, i.e., the angle at which the tooth penetrates the earth, is changed by turning the tooth over and alternating the mounting surface secured to the |
| 5366031 |
Auger head assembly and method of drilling hard earth formations |
November 22, 1994 |
| An auger is provided with a boring head having an arrangement for cutting relatively hard earth formations such as rock. First and second groups of drill bits are mounted to the boring head such that when the head is rotated, each bit in those groups cuts a different path at a different |
| 5184412 |
Auger tooth locking mechanism |
February 9, 1993 |
| An elongated resilient retainer is positioned between an excavating tooth and tooth holder such that the tooth and tooth holder compress and, thus, deform the retainer to frictionally secure the tooth to the tooth holder. The resilient retainer includes ribs that extend longitudinally al |
