×

Portable earth boring machine

  • US 3,939,926 A
  • Filed: 11/29/1974
  • Issued: 02/24/1976
  • Est. Priority Date: 08/14/1974
  • Status: Expired due to Term
First Claim
Patent Images

1. In an earth boring apparatus of the type that forms horizontal holes and pushes sections of casing into said holes, the combination of casing means comprising a lead casing section provided with a plurality of side openings;

  • bearing means mounted in said lead casing section;

    a rock head mounting shaft journaled in said bearing means;

    a rock drilling head mounted on the forward end of said mounting shaft;

    a wedging means radially moveably mounted at each of said side openings and extendable outwardly therefrom;

    wedge driving means for said wedging means for extending and retracting said wedging means against and away from the rock surrounding said lead casing section;

    sensing means for progressive extension into the earth fill;

    gauge means for location adjacent the earth fill and connected to the sensing means, said gauge means including read-out indicia for informing the operator of grade deviations of the sensing means; and

    automatic control means for energizing said wedge driving means responsive to sensing of a deviation in grade by said sensing means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×