E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/81
E21B 10/32 (2006.01) E21B 10/20 (2006.01) E21B 10/22 (2006.01) E21B 10/34 (2006.01) F16J 15/32 (2006.01) F16J 15/34 (2006.01)
Patent
CA 1307520
ABSTRACT OF THE DISCLOSURE The present invention relates to an improved underreamer, hole opener, or expansible rotary drill bit with a conical cutter having an improved cutter mounting. The underreamer includes a body with a bore therethrough, an arm pivotally mounted to said body at its upper end with a pin on its lower end, a conical cutter having a central bore, means for securing the pin in the central bore of the cutter, and bearing means positioned between the exterior and end of said pin and the wall of said central bore of the cutter. The bearing means is designed to take both the normal thrust and radial loads applied on the cutter during drilling and also a reverse thrust load which is placed on the cutter in an underreamer. The underreamer arm of the present invention is a one-piece element having no welded connections. Furthermore, there is essentially no wear on the underreamer arm or its pin element by the cutter assembly during operation so that it does not need to be frequently replaced.
534525
Bailey Thomas F.
Campbell John
A-Z International Tool Company
Bailey Thomas F.
Campbell John
Drilex Systems Inc.
Masx Energy Services Group Inc.
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