| 摘要 |
FIELD: domestic building and lawn-and-garden equipment, particularly for drilling holes for bearing fence posts installation, for well boring, for making planting holes, for boring fishing holes in ice and so on. ^ SUBSTANCE: drill includes auger rod and plate installed on one auger rod end. Plate has two cutting knives. Screw blade is connected to one cutting knife and to auger rod. Handle for manual auger rod rotation is connected to other rod end. Screw blade has fixed bead extending at an angle alpha of 90o - 140o to plane of working blade surface. Bead height is 5-50% of screw blade lead H. Angle alpha is preferably equal to 95o, bead height is preferably 10% of screw blade lead H. ^ EFFECT: increased drilling capability. ^ 2 cl, 1 dwg |
