4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector

John R. England

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Dry pneumatic system for hard rock shaft drilling

Pipe joints or couplings – Pipe to discreet nipple or sleeve to plate
Patent

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Dry pneumatic system for hard rock shaft drilling

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With suction pump inlet communicating with bore bottom
Patent

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In-the-hole drill

Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent

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Non-rotating spring loaded stabilizer

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Spherical bit

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Profile ID: LFUS-PAI-P-83517

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