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US 8,033,343 B2Granted
Water powered impulsive unit
AssigneeGlencross Limited
InventorsAlan Barrows, Douglas Barrows
Life of this patent
Estimating the term…
Abstract
An impulsive unit for a jack hammer or rock drill is adapted to be powered by water, and comprises a piston slidable within a cylinder, and carrying a striker portion thereon. At least a portion of the piston and/or cylinder is coated with ceramic. The ceramic is most suitably an aluminum oxide-titanium dioxide composite, which enables the clearance between the internal diameter of the cylinder and the external diameter of the piston to be reduced to between 8 and 10 micro-meters.
Claims18
An impulsive unit adapted to be powered by water, comprising:
- a piston slidable within a cylinder, said piston coupled to a striker portion for engagement with a tool, in which at least a portion of the piston or cylinder or both have a ceramic coating;
- a pressure unit for building up a charge of water under pressure and directing the charge of water under pressure towards a face of the piston;
- and
- valve means fluidly coupled to said cylinder for controlling the charge of water to and from the cylinder.
1 more element
An impact tool comprising:
- a housing including walls that define a cylinder,
- a piston disposed in said cylinder,
- wherein at least one of said walls, or said piston, or both include a ceramic coating;
- and
- a water supply means for supplying water to the impact tool from a closed loop supply.
2 more elements
Dependencies are inferred from the claim text.