Auger bit

• US 7,571,781 B2
• Filed: 04/25/2007
• Issued: 08/11/2009
• Est. Priority Date: 04/26/2006
• Status: Expired due to Fees

• Current Assignee: Bauer Maschinen GmbH (Bauer AG)
• Original Assignee: Bauer Maschinen GmbH (Bauer AG)
• Inventors: Stoetzer, Erwin
• Primary Examiner(s): Bagnell; David J
• Assistant Examiner(s): Hutchins; Cathleen R
• Application Number:
  US11/790,373
• Publication Number:
  US 20080035385A1
• Time in Patent Office: 839 Days
• Field of Search: 175/421, 175/394, 175/388, 175/18, 175/392, 175/412, 175/413, 408/227, 408/230, 408/229, 372/44, 372/57, 371/89, 172/25, 172/41, 172/35, D15/131, D15/132
• US Class Current: 175/413
• CPC Class Codes: E21B 10/42 Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by wear resisting parts E21B10/46; by conduits or nozzles for drilling fluid E21B10/60; by detachable or adjustable parts E21B10/62
• CPC Class Codes: E21B 10/44 Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts E21B10/42 takes precedence

Abstract

The invention relates to an auger bit for an earth auger, in which at least two curved plates are provided and extend radially outwards from a drilling axis, the axial height decreasing radially outwards.

Claims

1. An auger bit for an earth auger having a drilling axis, the auger bit comprising:

a discrete planar base plate,

at least two individual curved segments of a cylindrical pipe, each segment having a planar end and a cutting helix having a cutting edge, each segment extending radially outwards from the drilling axis and whose axial height decreases radially outwards, the at least two segments all having the same radius of curvatures, and the at least two segments having a constant thickness as they extend radially outwards, and

a weld for separately fixing the planar end of each of the curved segments to the base plate.

2. The auger bit according to claim 1, wherein each segment is an approximately quarter circular arc-shaped segment with a triangular or trapezoidal contour.

3. The auger bit according to claim 1, wherein a central element is positioned coaxially to the drilling axis and the segments are adjacent thereto.

4. The auger bit according to claim 1, wherein there are three segments arranged with a uniform angular spacing to one another.

5. The auger bit according to claim 1, wherein each of the curved segments has an axis of curvature and the axes of curvature are arranged parallel or inclined to the drilling axis.

6. The auger bit according to claim 1 for use with a drilling rod, the auger bit further comprising a pipe base body connected to the base plate, the pipe base body being provided for fitting to the drilling rod.

7. The auger bit according to claim 6, further comprising a positive locking device for a detachable connection to the drilling rod provided on the pipe base body.

8. The auger bit according to claim 6, further comprising a positive locking device for a detachable connection to the drilling rod provided on the base plate.

9. Drilling device with a drilling rod wherein the drilling rod is provided with an auger bit according to claim 1.

10. The auger bit according to claim 1, wherein there are four segments arranged with a uniform angular spacing to one another.