Resources Contact Us Home
Down-the-hole rock drill

Image Number 4 for United States Patent #5435401.

A down-the-hole rock drill includes a top sub, a driver sub having a bore therein, and a piston case extending between and detachably connected to the top sub and the driver sub. A piston is located within the piston case, and a drill device is detachably connected to the driver sub. The drill device includes a shank and a head. The drill device also has a central passageway for a flushing medium. A tube is secured in the central passageway at a free end of the shank. The tube extends beyond the free end of the shank, and the piston has a central piston passageway that receives the tube. The piston is slidably movable relative to the tube. A first portion of the shank located closest to the head has a cross section, normal to a longitudinal center axis of the shank, in the shape of a multi-lobed figure that is continuously non-concave, and the bore of the driver sub is of a matching cross-sectional shape. In addition, the drill device is secured axially by a bit retainer that symmetrically cooperates with a circumferentially extending shoulder on a second portion of the shank. The second portion being located closest to the free end of the shank.

  Recently Added Patents
Illumination apparatus for microlithography projection system including polarization-modulating optical element
Electronic component and reflected-wave cancelling method
Plant disease control composition and its use
System and method to assess and report the health of landing gear related components
Diaminocyclohexane compounds and uses thereof
Portable electronic device housing including hinge
Toy vehicle housing
  Randomly Featured Patents
Semiconductor processing system with wafer container docking and loading station
Exhaust gas recirculation control
Preparation of substituted fluorobenzenes
Automatic gain control
Silver halide emulsion and chemical sensitization method thereof
Community antenna television reception controlling apparatus
Scraping tool for cleaning cooking grills
Personal digital assistant
Process for the removal of SO.sub.2 from gas streams