E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
262/7
E21D 1/06 (2006.01) E21B 7/00 (2006.01) E21B 11/06 (2006.01)
Patent
CA 1234167
-22- A B S T R A C T EARTH BORING APPARATUS An earth boring or shaft sinking apparatus in which a column is continuously rotatable about its axis, the column including a cutting wheel at one end rotatable about a wheel axis normal to the axis of the column, the cutting wheel including sprockets mounted about the wheel axis, the sprockets providing engagement for an endless bucket-carrying chain for direct conveyance of cuttings from the bottom of a hole to the top end of the column, which includes another set of sprockets for the endless bucket-carrying chain and discharges the cuttings into a feed bin. The cutting wheel is continuously rotated about the column longitudinal axis, as well as its wheel axis of rotation. In one example, a main, enlarged, cone-shaped cutting head is rotatable with the column for rotation about the column axis at a selected rate of speed, while the cutting wheel is additionally rotated about its wheel axis at a different selected speed, rotation of the cutting wheel and of the cutting head being continuous, the cutting wheel providing an advancing central bowl shaped recess adapted to serve as a lead or pilot hole to receive cuttings from the second enlarged main cutting head. Different arrangements of cutting wheels and endless bucket means are provided.
480555
Hynd John G.s.
Salter Martin de Gaudrion
Bereskin & Parr
Cementation Company Of America Incorporated
Cementation Foundations Skanska Limited
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