Resources Contact Us Home
Bore hole underreamer

Image Number 4 for United States Patent #6886633.

Provided is a bore hole underreamer, intended in particular for oil drilling. The underreamer has a hollow body and at least two cylindrical bores. The bores are distributed over the circumference of the hollow body and each bore contains a cylindrical widening arm. Each arm has a bladed cutting end disposed on the outside of the body that slides between active and inactive positions. Another end of each arm is disposed inside the body and receives fluid pressure for pushing the arm into the active position. The underreamer includes a locking member for locking the arms in their inactive position when the locking member is immobilized in the body in a releasable fashion in a locking position. When released, the locking member leaves the locking position under a thrust from at least one of the arms subjected to the pressure capable of pushing the arm into its active position.

  Recently Added Patents
Proximity-based mobile message delivery
Distortion estimation for quantized data
Anomalous data detection method
High-accuracy centered fractional fourier transform matrix for optical imaging and other applications
Electronic dispersion compensation within optical communications using reconstruction
Keypoint descriptor generation by complex wavelet analysis
Retransmission and retransmission request in data communication systems
  Randomly Featured Patents
Organosilicon compound, organosilicon resin having diol, and processes for producing these
Developing roller, process cartridge, and electrophotographic apparatus
Multiple input multiple output antenna
Method and apparatus for automatic vehicle event detection, characterization and reporting
Method for the self-alignment of metal contacts on a semiconductor device, and self-aligned semiconductors
Cartridge package for automatic or semiautomatic firearms
Dual supply circuit
Commonly housed electrostatic fuel atomizer and igniter apparatus for combustors
Semiconductor integrated circuit device