| 摘要 |
A rock auger for drilling postholes through rock without the use of hydraulic pressure and at a slow rate of revolutions per minute can function utilizing only the weight of the auger, shaft, and/or boom providing a floating auger to reduce shock and vibration stress on the auger, boom, and drive unit. It does not require any additional hydraulic pressure for cutting a circular hole through the rock and forming a plug which is to be lodged in the cavity of the rock auger cylinder to be removed from the posthole. A quick connection shaft enables the conventional flighted auger to be quickly substituted for the rock auger to facilitate fast removal of soft dirt from the posthole. A center drill bit can be disposed within the cutting head for extending outwardly pass the cutting edge thereof for starting the hole, breaking up rock, and holding the auger in position guiding it during the drilling operation. A section or portion of the cutting head extending from the cutting edge upward a selected distance to as far as the upper edge of the cutting head may be removed providing access and quick removal of the plug formed therein.
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