Boring tool

Details Boring tool Boring tool

1999-02-18

2000-09-12

Pezzuto, Robert E

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

E21B 1036

Patent

active

061163619

ABSTRACT:
A drill including a shank (1) for connecting the drill with a drive tool, a stem (2) adjoining the shank (1) and having at most two helical discharge grooves (6, 7) opening toward a stem circumference, a head (3) provided at an end of the stem (2) remote from the shank (1) and having a diameter substantially corresponding to the stem diameter, with the head (3) having three radially extending recesses (8) provided in its free end surface and opening toward a head circumference, with the recesses being provided with at least one hard metal bit (9) provided with cutting portions (9a) extending from a central portion (9b) to the head circumference, and with the head (3), having three grooves (10, 11, 12) arranged between the three recesses (8), opening toward the head circumference, and connected with the discharge grooves.

REFERENCES:
patent: 3773122 (1973-11-01), Chromy
patent: 4903787 (1990-02-01), Moser et al.
patent: 4951761 (1990-08-01), Peetz et al.
patent: 5482124 (1996-01-01), Haussmann et al.
patent: 5836410 (1998-11-01), Kleine
patent: 6032750 (2000-03-01), Kersten et al.

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