Patent ID: 8064289

Claim:
A measuring device for a drilling apparatus, said apparatus comprising at least a tubular drilling element able to rotate and to move axially, said measuring device comprising sensor means, disposed on said tubular element and able to detect signals to effect seismic measurements during the drilling operation, and at least a feed system of the electromagnetic induction type, able to feed said sensor means electrically, connected to a feed source and comprising a rotary element, mounted coaxial and solid with said tubular element, and a rotationally fixed part, or stator, disposed in a position of cooperation with said rotary element, the device further comprising guide means, mounted on said apparatus, and mobile supporting means, on which said stator is supported, able to slide on said guide means with an axial motion substantially corresponding to that of said tubular element, in such a manner that said stator can be always in a defined position of cooperation with said rotary element in any position whatsoever assumed by said tubular element during the drilling operation.