Joint sensor for a power tong

Details Joint sensor for a power tong Joint sensor for a power tong

E - Fixed Constructions

21

B

341/97, 255/14.7

E21B 44/00 (2006.01) E21B 15/00 (2006.01) G05B 15/02 (2006.01)

Patent

CA 1147434

JOINT SENSOR FOR A POWER TONG ABSTRACT OF THE INVENTION A method and apparatus for sensing a drill pipe joint is characterized by an arm pivotally moveable with respect to a drill pipe from a first, normal, position. The arm deflects a predetermined angular distance from the normal position when it comes into contact with a predetermined distended location on a drill pipe. An electrical signal is generated by a signal arrangement associated with the arm to indicate that the predetermined distended location is reached.

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