Reversible bit bearing

Details Reversible bit bearing Reversible bit bearing

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 10/38 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2109302

2109302 9318272 PCTABS00025 A fluid-activated, percussive, down-the-hole drill (1) having a reversible bearing (4) and bit (9) combination for altering the volume of return reservoir exhaust fluid between a larger amount for deep hole drilling and a smaller amount for shallow hole drilling.

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