Portable power rotary device provided with drill having earthwork and cut-off functions

Abstract

A rotary device having mounted therein a drill for soil earthwork. The drill includes a shaft and a screw, formed along the outer circumferential surface of the shaft, for earthwork and the transportation of displaced soil. A rotary shaft is formed on the upper part of the shaft. A fixed shaft part is formed on the lower part of the shaft, for being inserted and rotated into the soil. A pair of horizontal blades face each other on the connection part between the shaft and the fixed shaft part. Cutting blades, which are symmetrical with each other, incline downwardly on the pair of horizontal blades. Vertical blades protrude vertically on the upper portion of the lower wing of the screw and, when performing earthwork, soil and tree roots are cut by the cutting blades, and soil lumps, transferred along the screw, are cut again by the vertical blades.

What is claimed is: 
     
         1 . A portable power rotary device provided with a drill having earthwork and cut-off functions, wherein the drill for excavating soil is rotatably mounted in the portable power rotary device, and comprises: a shaft part; a screw formed along the outer circumferential surface of the shaft part, for excavating soil and transporting the excavated soil; a rotary shaft formed on the upper part of the shaft part; a connection socket installed on the rotary shaft for adjusting length; and a fixed shaft part formed on the lower part of the shaft part for being inserted and rotated into the soil to be excavated,
 wherein a pair of horizontal blades are formed on the connection part between the fixed shaft part and the shaft part to face each other; the screw has layers formed one on the other and symmetrically and integrally connected to each other on the pair of horizontal blades, for transporting soil upwardly; cutting blades are inclined downwardly to be symmetrical to each other and are integrally formed on the pair of horizontal blades; a plurality of vertical blades protrude vertically from the upper portion of the lower wing of the screw and are formed to be spaced apart from each other at a predetermined distance; and, when soil is excavated, soil and tree roots are cut by the cutting blades, and soil lumps, transferred along the screw, are cut again by the vertical blades.   
     
     
         2 . The portable power rotary device of  claim 1 , wherein the cutting blades formed on the horizontal blades have blade parts formed on lower ends thereof and inclined inwardly, for cutting soil and tree roots during excavation and transporting the soil toward the screw. 
     
     
         3 . The portable power rotary device of  claim 1 , wherein the vertical blades formed on the upper portion of the lower wing of the screw have edges formed in a saw-tooth shape or a diamond shape and inclined, and are formed by welding or attachably or detachably formed. 
     
     
         4 . The portable power rotary device of  claim 1 , wherein the fixed shaft part has a cutout groove formed on the center of the lower end thereof and thus has excavation blades twisted to cross each other, for digging into soil by itself without pressing the device. 
     
     
         5 . The portable power rotary device of  claim 1 , wherein the fixed shaft part has a pointed part formed at the lower end thereof and a spiral formed on the upper circumferential surface thereof, for inducing the fixed shaft part to dig into soil by itself without pressing the device. 
     
     
         6 . The portable power rotary device of  claim 1 , wherein the connection socket is connected to the rotary shaft to adjust the length of the drill, so that a worker works in a comfortable position and thus fatigue is reduced, or when it is necessary to increase excavation depth, a connection socket of a different size is connected and used.