Interference warning device

Details Interference warning device Interference warning device

G - Physics

08

B

340/102

G08B 19/00 (2006.01) E21B 19/00 (2006.01) E21B 19/20 (2006.01)

Patent

CA 1225448

ABSTRACT OF THE DISCLOSURE An interference warning device for an oil well drill- ing rig having a derrick, traveling equipment, a racker arm, and a block retractor. Fluid activated sensors provide electric signals when the traveling equipment is within a selected vertical distance from the racker arm, when the racker arm is within a selected horizontal dis- tance from the vertical axis of the derrick, or when the block retractor has extended the traveling equipment to within a selected distance from the fully extended po- sition. The operator is informed when any one of the sensors is activated, cautioned when any two of the sensors are activated, and warned when all three sensors are activated. The drawworks may be braked when all three sensors are activated.

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