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
Deposited conductive layers for leads of implantable electric stimulation systems and methods of making and using
Stable liquid VEGF antagonist formulations
Nonvolatile semiconductor memory device
Shoe
Laser processing machine
Cosmetic or pharmaceutical peptides containing uncoded amino acids and their use in the treatment and/or care of the skin, mucous membranes, or scalp
Reception method and reception apparatus
  Randomly Featured Patents
Apparatus and method of processing substrate containing mark and method of manufacturing device
Method for data exchange with a mobile asset considering communication link quality
System for generating a seismic signal in a borehole
Point relay scanner utilizing ellipsoidal mirrors
Liquid dispensing device with separable waterway
One Piece rear seal for servomotor
Process for manufacturing a fuel tank equipped with an internal accessory
Video signal processing apparatus to multiplex a video and control signal
Method and apparatus for interfacing between a wearable electronic device and a server and an article of fitness equipment
Encoding rate-based, programmable, linear velocity, compressed audio compact disc player