초록 ▼

A vibratory drill head for use with a drill stand apparatus. The eccentric cams are mounted on parallel drive shafts which are powered by hydraulic motors. The hydraulic motors cause the drive shafts to spin in opposite directions. The counter-rotating eccentric cams eliminate horizontal vibration a

A vibratory drill head for use with a drill stand apparatus. The eccentric cams are mounted on parallel drive shafts which are powered by hydraulic motors. The hydraulic motors cause the drive shafts to spin in opposite directions. The counter-rotating eccentric cams eliminate horizontal vibration and maximize vertical vibration. The vibratory drill head is mounted to a drill shaft such as a sample tube. When the vibrating drill shaft is lowered into the soil, the vibrations allow the sample tube to pierce the soil to collect the sample. The minimization of horizontal vibration produces accurate core samples.

대표청구항 ▼

[ What is claimed is:] [1.] A vibratory drill head apparatus for use with drilling apparatus including a drill stand and a drill shaft, extending along a drilling axis, the vibratory drill head comprising:(a) a housing releasably coupled to the drill stand and to the drill shaft;(b) a pair of drive

[ What is claimed is:] [1.] A vibratory drill head apparatus for use with drilling apparatus including a drill stand and a drill shaft, extending along a drilling axis, the vibratory drill head comprising:(a) a housing releasably coupled to the drill stand and to the drill shaft;(b) a pair of drive shafts mounted in the housing for rotation about spaced parallel drive axes perpendicular to the drilling axis;(c) a pair of eccentric cams for exerting vibratory forces on the housing when the drive shafts are rotated, wherein each of the eccentric cams is rigidly mounted on one of the drive shafts, the drive shafts being spaced to allow for rotation of the cams;(d) motor means for counter-rotating the drive shafts at the same speed, thereby synchronizing the vibratory forces generated by the eccentric cams along the drilling axis; and(e) coupling means for coupling the housing to the drill shaft, wherein the coupling means comprises a coupling member extending downwardly from the housing which slidingly fits over a coupling member extending upwardly from the drill shaft.