Percussive air hammer and core bit apparatus

Details Percussive air hammer and core bit apparatus Percussive air hammer and core bit apparatus

1974-10-24

1976-03-02

Brown, David H.

Boring or penetrating the earth

With below-ground tool drive prime mover

Discharge passage for motive fluid directed toward bore...

173 78, 173135, 175 60, 175215, E21B 106, E21B 312, E21B 500

Patent

active

039411966

ABSTRACT:
An airhammer and core bit apparatus including a housing and a hammer piston reciprocable in the housing for delivering repeated impact blows to an anvil secured to or forming part of a core bit which produces a core in a bore hole being drilled. A central core receiving tube extends through the housing and hammer piston, through which the core formed by the bit is conducted upwardly and through the hammer piston to the top of the bore hole, part of the compressed air supplied to the airhammer being diverted to the central tube for elevating the core therewithin toward the top of the bore hole.

REFERENCES:
patent: 1862260 (1932-06-01), Edmunds
patent: 3162251 (1964-12-01), Bassinger
patent: 3191693 (1965-06-01), Lincoln
patent: 3524511 (1970-08-01), Klemm
patent: 3583501 (1971-06-01), Aalund
patent: 3712388 (1973-01-01), Curington
patent: 3735820 (1973-05-01), Curington
patent: 3795283 (1974-03-01), Oughton
patent: 3807514 (1974-04-01), Murrell
patent: 3830319 (1974-08-01), van der Wijden

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