Drill shock absorber

Details Drill shock absorber Drill shock absorber

F - Mech Eng,Light,Heat,Weapons

16

F

77/41

F16F 15/10 (2006.01) E21B 3/02 (2006.01) E21B 17/07 (2006.01) F16F 15/126 (2006.01)

Patent

CA 1044491

ABSTRACT A shock absorber for dampening longitudinal and tor- sional vibrations in a drill is disposed intermediate a hollow drive shaft member and a hollow driven shaft member of a drill- ing string. Resilient means are sandwiched between a drive plate attached to the drive shaft member and a driven plate se- cured to the driven shaft member. Additional resilient means are sandwiched between the driven plate and a pressure plate which surrounds the driven shaft member at a position beneath the driven plate. Pins project from the driven plate through the resilient means into vertically spaced openings formed in the drive plate and the pressure plate. Fastening means ex- tend between the drive plate and the pressure plate to pre- compress the resilient means, and a shielding sleeve is con- nected to the drive shaft member for sliding movement within the driven shaft member. This sleeve forms a closed passage between the hollow shaft members for conveying compressed air, and for shielding the resilient means from dynamic air pres- sures.

240803

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