Extension rod for percussive drilling tool

Details Extension rod for percussive drilling tool Extension rod for percussive drilling tool

1976-07-20

1977-12-06

Shedd, Wayne L.

Joints and connections

Interfitted members

Longitudinally splined or fluted rod

89 16, F16B 704

Patent

active

040614336

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.

REFERENCES:
patent: 2624366 (1953-01-01), Pugh
patent: 2849923 (1958-09-01), Cotterman
patent: 3004361 (1961-10-01), Hammer
patent: 3228298 (1966-01-01), Grandy et al.
patent: 3261414 (1966-07-01), Boice
patent: 3295613 (1967-01-01), Anderson
patent: 3709754 (1973-01-01), Medler

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