Patent Number: 6,637,521

Title: Earth borer

Abstract: An earth borer includes a thin-walled tubular shaft (4), a shank (2)provided at one end of the tubular shaft (4), and a drilling head (5)provided at another, opposite end of the tubular shaft, projectingradially beyond the tubular shaft (4), and having at least one cutter forbreaking the bore core and (6, 6a, 6b, 6c, 6d) extending, at leastpartially, radially inward and at least one internal groove (7, 7a, 7b)associated with the at least one cutter, and a releasable tubularconnection member (8) for drivingly connecting the shank (2) with tubularshaft (4) for joint rotation with each other.

Inventors: Saitta; Robert S. (Broken Arrow, OK)

Assignee:

International Classification: E21B 17/02 (20060101); E21B 17/046 (20060101); E21B 10/00 (20060101); E21B 10/02 (20060101); E21B 11/00 (20060101); E21B 007/26 (); E21B 017/046 (); E21B 010/04 ()

Expiration Date: 10/22015