Drill shock absorber

Details Drill shock absorber Drill shock absorber

1974-12-23

1976-03-30

Marbert, James B.

Spring devices

Resilient shock or vibration absorber

Tool movement dampening

64 13, F16F 1510

Patent

active

039470091

ABSTRACT:
A shock absorber for dampening longitudinal and torsional vibrations in a drill is disposed intermediate a hollow drive shaft member and a hollow driven shaft member of a drill string. Resilient means are sandwiched between a drive plate attached to the drive shaft member and a driven plate secured 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 extend between the drive plate and the pressure plate to precompress the resilient means, and a shielding sleeve is connected 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 pressures.

REFERENCES:
patent: 3746330 (1973-08-01), Taciuk
patent: 3775998 (1973-12-01), Century et al.

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