G - Physics – 01 – B
Patent
G - Physics
01
B
33/137, 33/182,
G01B 5/18 (2006.01)
Patent
CA 1141150
WELL SERVICING APPARATUS Abstract of the Disclosure Apparatus for a well servicing rig having a rotatable driven drum,an upwardly extending tower adjacent to said drum, a sheave rotatably mounted on an upper part of said tower, and a length of cable partially wound around said drum and extend- ing upwardly over said sheave and downwardly therefrom; said apparatus including at least two sensing elements disposed adjacent to the periphery of said sheave, said sensing elements being adjacent to each other in an arcuate pattern, a plurality of equally spaced, circumferentially arranged triggering ele- ments mounted on said sheave adjacent to the periphery thereof, pulse sorting means connected to said sensing elements, direc- tion indicating means connected to said sensing elements, pulse counting means connected to said pulse sorting means and to said direction indicating means, constant tabulating means connected to said pulse counting means and to constant receiv- ing and retaining means, and read-out means connected to said constant tabulating means.
351366
Gowling Lafleur Henderson Llp
Pearce Leonard D.
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