Block position and speed transducer for a computer-...

Details Block position and speed transducer for a computer-... Block position and speed transducer for a computer-...

E - Fixed Constructions

21

B

341/101

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

Patent

CA 1147435

ABSTRACT Apparatus for indicating the position of a travelling block along a vertical axis within a computer-controlled oil drilling rig is characterized by a magnetically responsive element for generating a pulse when a metallic member, movable with the travelling block, passes in proximity thereto. A counter is operatively associated with the magnetically responsive element to count the pulses therefrom. An electrical signal of a predetermined magnitude functionally related to the output of the counter is representative of the position of the travelling block.

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