Boring devices

Details Boring devices Boring devices

E - Fixed Constructions

21

B

255/81

E21B 10/32 (2006.01)

Patent

CA 1188678

IMPROVEMENT IN BORING DEVICES ABSTRACT OF THE DISCLOSURE The improvement in the boring devices is adapted to cut grooves or cavities at the bottom of bored holes. It comprises a tool (3) containing a diaphragm (17) forming an expansion chamber to which a liquid under pressure can be supplied for radi- ally displacing cutting elements (24) set with diamonds between a retracted position and a projecting working position. The measure- ment of the variation of the volume of the liquid under pressure in a chamber (26) enables the radial position of the elements (24) to be known.

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