E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 21/08 (2006.01) E21B 4/00 (2006.01) E21B 4/02 (2006.01) E21B 44/00 (2006.01)
Patent
CA 2071612
ABSTRACT OF THE DISCLOSURE An apparatus for preventing an uncontrolled increase in the speed of a drilling motor during air drilling which consists of a cylindrical housing and a cylindrical inner mandrel telescopically received within the housing. Bearings are disposed between an interior surface of the housing and an exterior surface of the inner mandrel thereby facilitating relative rotation of the housing and inner mandrel while bearing axial and radial loading. A first clutch is secured to the interior surface of the housing. A second clutch is secured to the exterior surface of the inner mandrel in opposed relation to the first clutch. Limited axial movement is provided between the housing and the inner mandrel. When placed in compression during the process of drilling the housing and the inner mandrel move axially to space the first clutch and the second clutch apart thereby permitting relative rotation of the housing and the inner mandrel. When placed in tension the housing and the inner mandrel move axially to bring the first clutch into locking engagement with the second clutch thereby preventing relative rotation of the housing and the inner mandrel.
Thompson Lambert Llp
Wenzel William
LandOfFree
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