Rock drill

Details Rock drill Rock drill

1979-10-04

1981-10-27

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175417, E21C 1301

Patent

active

042968259

ABSTRACT:
A rock drill for percussion drilling comprising a central button insert and a row of outer button inserts. The central button insert extends beyond the outer inserts. For purposes of increasing the drilling rate and the life of the rock drill the ratios of respectively this extent (X) to the diameter (D) of the hole; X:D, and the transverse distance (Y) between the central insert and one of the outer inserts and the diameter (D); Y:D, shall be within predetermined limits.

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patent: 3100545 (1963-08-01), Zimmerman
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patent: 3519092 (1970-07-01), Miller
patent: 3800892 (1974-04-01), Fischer
patent: 3885638 (1975-05-01), Skidmore
patent: 3997011 (1976-12-01), Staroba
patent: 4005906 (1977-02-01), McKenry et al.
patent: 4151889 (1979-05-01), Lister

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