Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Spectral sensor for checking documents of value
Resource capacity monitoring and reporting
Method and system for simulating superimposition of a non-linearly stretchable object upon a base object using representative images
360-degree angle decoder
Methods and systems for motion estimation with nonlinear motion-field smoothing
Light-emitting device
Selective facsimile denial
  Randomly Featured Patents
Recycling system
Ship and ship loading and unloading system
Surgical stapling instrument incorporating a tapered firing bar for increased flexibility around the articulation joint
Method for treating a brittle thin metal strip and magnetic parts made from a nanocrystalline alloy strip
Optical devices made from radiation curable fluorinated compositions
Sensitivity analysis for selecting therapy parameter sets
Soap bar
Equipment for heating and cooling substrates for coating photo resist thereto
Non-corrosive reinforcing member having bendable flanges
Gymnastic machine