Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent
1989-02-15
1990-06-12
Novosad, Stephen J.
Boring or penetrating the earth
Below-ground impact members
Fluid-operated
175 92, E21B 414
Patent
active
049324837
ABSTRACT:
A down hole hammer comprises a top sub and a drill bit support supporting a drill bit separated by a tubular housing to define a piston chamber therebetween. A feed tube is mounted to the top sub and extends concentrically into the piston chamber. A piston is slidably received within the housing and over the feed tube. Fluid porting is provided in the feed tube and the piston to sequentially admit fluid to a first space between the piston and top sub to drive the piston towards the drill bit support and to a second space between the piston and the drill bit support to drive the piston towards the top sub. The piston is formed on its exterior with a wasted portion, and the housing is formed with a flow passageway extending axially along the wall from a position in the proximity of the drill bit support to a position spaced axially therefrom so that the fluid passageway provides communication between the second space and a third space defined between the waisted portion of the piston of the internal wall of the housing when the piston is in close proximity to the drill bit. Preferably, the fluid passageway is formed as at least one axial flute in the wall of the housing.
REFERENCES:
patent: 3045768 (1962-07-01), Huffman
patent: 4591004 (1986-05-01), Gien
patent: 4771835 (1988-09-01), Eaton
patent: 4819746 (1989-04-01), Brown et al.
Novosad Stephen J.
Rear Ian G.
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