POST HOLE BORER

• US 3,638,741 A
• Filed: 03/09/1970
• Issued: 02/01/1972
• Est. Priority Date: 03/09/1970
• Status: Expired due to Term

• Current Assignee: Joseph P. Zizak
• Original Assignee: Joseph P. Zizak
• Inventors: Zizak, Joseph P.
• Primary Examiner(s): Brown, David H.
• Application Number:
  US05/017,368
• Time in Patent Office: 694 Days
• Field of Search: 175/18,20,215,422,324,403
• US Class Current: 175/215
• CPC Class Codes: E21B 21/12 using drilling pipes with plural fluid passages, e.g. closed circulation systems
• CPC Class Codes: E21B 7/18 Drilling by liquid or gas jets, with or without entrained pellets E21B7/14 takes precedence

Abstract

A hydraulic boring tool or post hole borer in the form of a cylindrical structure having an inner cylinder member spaced therefrom to define an area into which water under pressure is introduced with a discharge of the water to take place at the bottom of the structure and on an inclined plane to erode the soil within the cylindrical structure and below the same for the purpose of digging post holes.

Claims

1. A hydraulic boring tool comprising, a cylindrical member, and inner cylindrical member connected thereto at the extremities of the cylindrical members and spaced therefrom to define an annular area therebetween, a pair of handles connected to the first named cylindrical member, one of said handles having a passage therethrough connected to the annular area between the cylindrical members, valve means associated with the passage and adapted to open and close the same, a plurality of apertures positioned around the connection between the cylindrical members at the extremity opposite the handle members, said handle member having the passage therethrough being adapted to be connected to a source of water under pressure, and said inner cylindrical member being opened at both extremities.

2. The hydraulic boring tool of claim 1, and including a cylindrical pipe member positioned at the center of the inner cylindrical member and connected thereto with said pipe having openings at the top and bottom thereof.

3. The hydraulic boring tool of claim 1 in which the connection between the outer and inner cylindrical members at the extremity remote from the handles includes an inclined surface with the apertures being positioned in the inclined surface and spaced about the annular extent of the same.

4. The hydraulic boring tool of claim 1 and including a digging surface at the extremity of the connected cylinder members having the apertures therein.

5. The hydraulic boring tool of claim 4 in which the digging surface at the connection between the cylindrical members is a toothed surface.

6. The hydraulic boring tool of claim 5 in which the apertures in the closed extremities of the cylindrical members define openings for jets of water which are inclined toward the center of the inner cylindrical member.

7. The hydraulic boring tool of claim 6 in which the valve means is positioned in the handle member having the passage therethrough.

8. The hydraulic boring tool of claim 7 in which the valve means has an operating handle positioned external of the handle and adapted to be gripped for operation of a valve to open and close the passage through the handle.

9. The hydraulic boring tool of claim 8 in which the inner cylindrical member has a partially closed top extremity.