Rotary air percussion bit

Details Rotary air percussion bit Rotary air percussion bit

1976-11-15

1978-05-30

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175395, E21C 1300

Patent

active

040918840

ABSTRACT:
A rotary air percussion bit has a cylindrically shaped sidewall, a body portion with a flat or recessed face on one end and a shank attached to the remaining end. A plurality of inserts of wear resistant material is mounted in the face and extending outwardly therefrom. A plurality of chip cutting grooves is formed in the face and extending radially from the axis of the body outwardly to the sidewalls. In order to improve the chip removal from the bit a plurality of chip clearance grooves is formed in the sidewall of the body extending from the terminus of the face chip cutting grooves and spiraling from the face to the shank end. The angle of the spiral with respect to the face is less than 45.degree..

REFERENCES:
patent: 3071201 (1963-01-01), Phipps
patent: 3158216 (1964-11-01), Baron et al.
patent: 3346060 (1967-10-01), Beyer
patent: 3608654 (1971-09-01), Powell
patent: 3885638 (1975-05-01), Skidmore
patent: 3915246 (1975-10-01), Shestawy
patent: 3955635 (1976-05-01), Skidmore

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