Guided earth boring tool

Patent · Tue Sep 22 04:00:00 EDT 1987

OSTI ID:5895965

Mc Donald, W J; Pittard, G T; Maurer, W C; Wasson, M R; Herben, W C

A controllable tool for drilling holes in the earth is described comprising a hollow elongated rigid supporting drill pipe having a forward end for entering the earth, means supporting the drill pipe for earth boring or piercing movement, including means for moving the drill pipe longitudinally for penetrating the earth, the drill pipe moving means being constructed to permit addition and removal of supporting drill pipe during earth penetrating operation, a boring mole supported on the forward end of the hollow low drill pipe comprising a cylindrical housing supported on and open to the forward end of the drill pipe, a first means on the front end for applying a boring force to the soil comprising an anvil having a striking surface inside the housing and a boring surface outside the housing, a second means comprising a reciprocally movable hammer positioned in the housing to apply a percussive force to the anvil striking surface for transmitting a percussive force to the boring force applying means, and means permitting introduction of air pressure supplied through the hollow pipe into the housing for operating the hammer and for discharging spent air from the housing to the hole being bored, and the tool being operable to penetrate the earth upon longitudinal movement of the drill rod by the longitudinal rod moving means and operation of the mole by reciprocal movement of the hammer.

• Assignee: Gas Research Institute, Chicago, IL
• Patent Number(s): US 4694913
• OSTI ID: 5895965
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
AIR FLOW
BOREHOLES
CAVITIES
CONFIGURATION
CYLINDRICAL CONFIGURATION
DESIGN
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLS
EQUIPMENT
FLUID FLOW
GAS FLOW
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
OPERATION
PERCUSSIVE DRILLS
PIPES
ROCK DRILLING
RODS