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US 4,061,433 AGranted
Extension rod for percussive drilling tool
AssigneeUgine Aciers
InventorHenri Chave
Life of this patent
Estimating the term…
Abstract
A composite extension rod for coupling a drilling tool and a hammer which is located outside of the drill hole and has a central tube surrounded by parallel high strength rods and an outer sheath which has coupling sleeves at its ends.
Claims9
A composite extension rod for interconnecting a drilling tool and a percussion means, said extension rod comprising:
- a. a central tube, said tube being hollow throughout to allow flow of cooling fluid,
- b. a plurality of elongated parallel high strength rods of a cross-section smaller than said tube arranged about the periphery of said tube, each rod being in contact with the next adjacent parallel rod,
- c. an outer sheath covering said parallel rods and holding said rods against said tube, and
- d. coupling means secured to said rod on each end for connection to said drilling tool and percussion means respectively.
1 more element
Dependencies are inferred from the claim text.