RU2298076C1 - Drill - Google Patents

Abstract

FIELD: building and agriculture, particularly ground excavation tools and devices, namely drills adapted to make holes in ground.

SUBSTANCE: drill comprises rod with handle formed on one drill end and at least one screw with cutting edge connected to opposite rod end. The screw has at least one turn. Helical screw surface facing handle is provided with elongated extensions so that slots are created in-between. The extensions are directed from outer helical screw edge and are inclined to screw edge tangent. The extensions are made as least on part of screw turn surface. Outer helical edge of the screw is cut from opposite side thereof so that sharp wave-like edge is formed. Extensions may be bent so that curvilinear slots are created in-between.

EFFECT: increased reliability due to possibility of outer helical drill screw edge self-sharpening.

2 cl, 3 dwg

Description

The invention relates to the field of construction and agriculture, in particular to devices and tools for earthwork, in particular to drill designs designed to form holes in the soil.

The closest in technical essence to the proposed device is a drill selected as a prototype, containing a rod with a handle at one end and placed on its other end, at least one screw with a cutting edge, consisting of at least one turn. (Patent for industrial design of the Russian Federation No. 57083, class 08-01, publ. July 16, 2005).

The disadvantages of the prototype are insufficient drilling efficiency and reliability of the device.

The technical result achieved by the invention is to provide increased reliability due to self-sharpening of the outer screw edge of the auger of the drill and to increase drilling efficiency by improving penetration into the soil while facilitating its rise to the surface.

The set result is achieved in that in a drill containing a rod with a handle at one end and placed at its other end, at least one screw with a cutting edge, consisting of at least one turn, on the screw surface of the screw facing the handle elongated protrusions are made with the formation of grooves between them, located oriented from the outer screw edge of the screw at an angle to its tangent and placed at least on part of the surface of the screw auger, and with the opposite arrangement of elongated Stupa side section formed outer screw flight edge to form a sharp edge wavy.

The elongated protrusions can be made curved with the formation of curved grooves between them, which further facilitates the lifting of the soil to the surface due to its more effective displacement from the periphery to the center of the screw.

Figure 1 shows a drill, a General view,

figure 2 - auger drill, 3/4 angle view from above,

figure 3 - auger drill, perspective 3/4 bottom view.

The drill contains a rod 1 with a handle 2 at one end 3 and placed on its other end 4, at least one screw 5 with a cutting edge 6, consisting of at least one turn. On the screw surface of the screw 5 facing the handle 2, elongated protrusions 7 are made with the formation of grooves 8 between them, located oriented from the external screw edge of the screw 5 at an angle α to its tangent and placed at least on a part of the surface of the screw 5, and opposite to the location of the oblong projections 7 of the side, a slice 9 of the outer screw edge of the screw 5 is formed with the formation of a sharp wavy edge 10 and surface 11. The oblong projections 7 can be made curved with the formation of a bent between them ies grooves 8 (see FIG. 2). At the end 4 of the rod 1 there is a pointed tip 12.

The drill works as follows.

The drill is installed at the required point on the ground (not shown in the drawings) with a certain pressure. After the introduction of the tip 12 into the soil, using the handle 2, the drill rotate around its longitudinal axis. When the drill rotates, the cutting edge 6 of the screw 5 cuts into the soil. In this case, the teeth of the sharp wavy edge 10 facilitate insertion into the soil layer, which, thanks to the elongated protrusions 7 and grooves 8, rushes from the periphery to the center, i.e. from the edge 10 to the rod 1, thereby excluding the accumulation of soil at the edge 10 and shedding it back into the formed hole and facilitating the rise to the surface. In addition, when interacting with the soil, leading to the wear of the surface 11 and the blunting of the wavy edge 10, the self-sharpening of the latter occurs.

Claims (2)

1. A drill containing a rod with a handle at one end and placed on its other end, at least one screw with a cutting edge, consisting of at least one turn, characterized in that on the screw surface of the screw facing the handle is made elongated protrusions with the formation of grooves between them, located oriented from the outer screw edge of the screw at an angle to its tangent and placed at least on part of the surface of the screw auger, and from the opposite location of the elongated protrusions of the side slice external helical screw form a sharp edge with a wavy edge. 2. The drill according to claim 1, characterized in that the elongated protrusions are made curved with the formation of curved grooves between them.

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