Percussion boring tool

Details Percussion boring tool Percussion boring tool

1985-04-16

1986-11-11

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Telescoping members relatively rotatable

175 19, 175 73, E21B 406, E21B 708

Patent

active

046216987

ABSTRACT:
A percussion boring tool is disclosed for boring in the earth at an angle or in a generally horizontal direction. The tool has a steering mechanism substantially as shown in a copending patent application and a cylindrical body with overgage sleeves located over a portion of the outer body affixed so that they can rotate but cannot slide axially. The overgage areas at the front and back of the tool, or alternately, an undergage section in the center of the tool body permits a 2-point contact (front and rear) of the outer housing with the soil wall as opposed to the line contact which occurs without the undercut. The 2-point contact allows the tool to deviate in an arc without distorting the round cross-sectional profile of the pierced hole. Thus, for a given steering force at the front and/or back of the tool, a higher rate of turning is possible since a smaller volume of soil needs to be displaced.

REFERENCES:
patent: 2979141 (1961-04-01), Kandle
patent: 3525405 (1970-08-01), Coyne et al.
patent: 3693731 (1972-09-01), Armstrong et al.
patent: 3794128 (1974-02-01), Gagen et al.
patent: 3888319 (1975-06-01), Bourne, Jr. et al.
patent: 3941101 (1976-03-01), Kostylev et al.
patent: 3952813 (1976-04-01), Chepurnoi et al.
patent: 4458765 (1984-07-01), Feklin et al.

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