Drill bit for jet assisted rotary drilling
AssigneesCharbonnages de France, Cocentall - Ateliers de Carspach
InventorsSerge Ippolito, Georges A. Cagnioncle
Life of this patent
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Abstract
The invention relates to the geometry of drill bits for jet assisted rotary drilling. According to the invention there is used a drill bit comprising platelets of small radial dimension disposed about a central burster in a discontinuous peripheral crown axially extending said drill bit, channels for supplying pressurized fluid opening from the crown close to the platelets. Said platelets are preferably separated from one another by rectilinear discharge ramps. A drill bit in accordance with this invention can be manufactured e.g. by turning or milling. It can be applied for drilling rock formations in mines, and other hard materials.
Claims20
A rock drill bit for very high pressure jet assisted rotary drilling to be mounted to the end of a rotational drive rod for rotation around a rotational axis, comprising a body, a discontinuous peripheral crown axially extending from said body opposite to said rod, a central burster within said crown, at least two drilling plates inserted in said crown, having a small radial dimension and formed with working edges radially and axially projecting from said crown, said drilling plates being circumferentially separated by debris discharge ramps provided across said crown, and very high pressure fluid supply channels crossing through said crown and opening close to said plates.
A rock drill bit for very high pressure jet assisted rotary drilling to be mounted to the end of a rotational drive rod for rotation around a rotational axis, comprising a body, a discontinuous peripheral crown axially extending from said body opposite to said rod, a central burster within said crown, at least two drilling plates inserted in said crown, having a small radial dimension and formed with working edges radially and axially projecting from said crown, said drilling plates being circumferentially separated by debris discharge ramps provided across said crown, and very high pressure fluid supply channels crossing through said crown and opening close to said plates, said discharge ramps being limited by rectilinear faces and said central burster being a cone which is inclined with respect to said rotational axis.
A rock drill bit for very high pressure jet assisted rotary drilling to be mounted to the end of a rotational drive rod for rotation around a rotational axis, comprising a body, a discontinuous peripheral crown axially extending from said body opposite to said rod, a central burster within said crown, at least two drilling plates inserted in said crown, having a small radial dimension and formed with working edges radially and axially projecting from said crown, said drilling plates being circumferentially separated by debris discharge ramps provided across said crown, and very high pressure fluid supply channels crossing through said crown and opening close to said plates, said plates being formed with a drilling wedge and said very high pressure fluid supply channels open forwardly of said plates through shoulder extending up towards the material to be drilled along said plates.
Dependencies are inferred from the claim text.