Patent ID: 8336643
Filing Date: 2012-12-25
Classification: E21B

Abstract:
1. A vibratory unit for an earth-penetrating device powered by a drive system, said unit comprising: a housing including a base plate; a mounting plate within said housing; means for slidably moving said mounting plate towards and away from said base plate; a rotatable shaft on said mounting plate; at least one weight eccentrically mounted about said shaft; a motor; means for associating said motor with said mounting plate; means for coupling said motor to said shaft; means for powering said motor whereby to rotate said shaft; an extension bar extending through said housing and presenting a first end beyond said housing and a second end beyond said base plate; means for coupling said first end of said bar to the drive system; means for coupling the second end of said bar to the earth-penetrating device, said housing interposed between the drive system and earth-penetrating device with said extension bar passing therethrough, a powering of the drive system transmitted to the earth-penetrating device coupled thereto by said bar; a powering of said motor rotating said shaft and said at least one weight thereon producing vibratory forces and forces for urging said mounting plate into said slidable movement for contact with said base plate, said contact providing an impulse force on the earth-penetrating device whereby said forces enhance penetration.