Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Bore hole underreamer










Image Number 5 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
Electrical terminal
Quantum dot template for fast and simultaneous detection of different infectious agents
Monitoring of undesirable fluid ingress into subsea control modules
DMAPN having a low DGN content and a process for preparing DMAPA having a low DGN content
Aspect ratio enhancement
Register files for a digital signal processor operating in an interleaved multi-threaded environment
Multi-room user interface
  Randomly Featured Patents
Fruit bowl
Solder bump, semiconductor chip, method of manufacturing the semiconductor chip, conductive connection structure, and method of manufacturing the conductive connection structure
Cannula
Amplifier arrangement
Mounting harness for an amusement ball device
Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and tetramethylsilane
Integral fence post and cap
Single latch manual actuator for testing microcircuits, and having a mechanical interlock for controlling opening and closing
Inlet air conditioning system
Enhanced cutting system for electric dry shavers