Drill rod for percussion drilling

Details Drill rod for percussion drilling Drill rod for percussion drilling

1974-12-03

1976-07-27

Leppink, James A.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

175320, 181 33A, E21C 1500, F16F 700

Patent

active

039714470

ABSTRACT:
Drill rod for percussion drilling comprising a central rod member and a sleeve member disposed therearound for a major portion of its length. An annular space is provided between said rod and sleeve members, said space being partially filled with one or several elements of noise-suppressing material, said elements when in plural being spaced from each other.

REFERENCES:
patent: 3265091 (1966-08-01), DeJarnett
patent: 3842942 (1974-10-01), Jensen et al.

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