DE102021005999A1 - Auger and method of making it - Google Patents

Abstract

The invention relates to an earth auger with a connection element that can be fixed in a receptacle of a motor-driven machine, a spiral-shaped base body and a cutting area provided at the opposite end of the earth auger, the spiral-shaped base body (2) consisting of a sheet metal strip (8) in a rectangular or conical shape shape of appropriate length, width and thickness, which is brought into a spiral shape by twisting around the longitudinal axis by means of a twisting device, and has a connecting element (3) on one side of the twisted metal strip (8) and a cutting head (4) on the opposite side .

Description

The invention relates to an earth auger, in particular for digging planting holes or holes for receiving posts in the ground, and a method for its manufacture.

A small planting trowel is usually used to create small planting holes, for example for inserting flower bulbs. In this way, individual planting holes can be dug in your own garden.

On the other hand, if large areas are to be prepared for planting flower bulbs or plants, it is advantageous to use mechanical assistance.

For this purpose, machine-driven augers, which are driven either by a petrol engine or an electric motor, or hand-operated augers are known.

From the DE 1719343 U a hand-operated auger is known, which is formed from a handle, a central rod with an auger and an auger with a tip. Conveyor screw and traction screw consist of plate-like surfaces that are spirally guided around the central rod.

Another version is from DE 1 721 033 U known, which describes an auger, in particular for making holes in the ground for receiving plants, trees, poles or fertilizer. The earth auger consists of a simple Schmid auger and conveyor screw connected to the auger rod with at least one surface which is supported on the ground and has a smaller pitch than the auger.

From the DE 1 969 822 U is a hand drill that can be used as an earth auger and ground anchor, in which a rearwardly tapering side cutter cuts out the cuttings and separates them from its surroundings. The subsequent auger consists of a continuous piece with a uniform pitch that spirals around the drill rod.

From the DE 20 2017 001 764 U1 is a device for digging planting holes with a shaft, a helical helix which is arranged at least partially around the shaft, with a connecting element for detachably fastening the device to a drilling machine being present at one end of the shaft.

From the DE 202 18 345 U1 a hand drill and an earth auger for a hand drill are known. In order to compensate for or reduce the vibrations when drilling with the auger, the auger is balanced, with the balancing mass being appropriately arranged at the height of the cutting edge of the auger. The auger has a shank, the first end of which can be fixed in the holder of the hand drill, and a helix wound around the shank, which extends at least over a section of the shank, with a cutting edge being provided in the area of the end of the helix facing away from the hand drill is on.

The disadvantage of the previously known state of the art is that the augers consist of several parts, some of which are complicated in their construction or have to be manufactured in a costly manner. The production requires a lot of processing time, resulting in a significant increase in cost.

The object of the invention is to specify an earth auger with a simple structure and a method for its production, with which the earth auger can be produced in a simple manner and inexpensively in a few work steps.

The object is achieved by a simple and inexpensive design of an earth auger having the features of claim 1 and a method for its manufacture having the features of claim 8.

The invention is based on the essential idea of achieving simplification by simply twisting a sheet metal strip (flat iron) in a rectangular or conical shape of the appropriate length, width and thickness by means of a twisting device into a spiral shape on one side a connection element is attached and the opposite side of the twisted sheet metal strip is formed into a cutting head.

In order to achieve a long service life for the auger, the cutting head can be hardened in the area of the cutting edges or fitted with cutting plates. Alternatively, the sections of the cutting head can each be provided with a weld bead.

It is formed into a cutting head by cutting the metal strip in the middle and bending the two sections in opposite directions at a certain angle.

A connection element is used for connection to a motor drive, for example a cordless screwdriver or a drill. These can be driven electrically, with an accumulator or with a combustion engine.

The connecting element can be formed by welding or by forging the end opposite the cutting head. Cylindrical or prismatic shapes, such as triangular or hexagonal shapes, or an SDS shank can be considered as connection elements.

The invention is explained in more detail by the following exemplary embodiment with reference to the accompanying drawings.

• 1 - erfindungsgemäßer Erdbohrer
• 2 - Rohling zur Herstellung des Erdbohrers
• 3 - Verdreheinrichtung

Show it:

• 1 - auger according to the invention
• 2 - Blank for crafting the Auger
• 3 - twisting device

The invention relates to an earth auger 1, in particular for digging planting holes or holes for receiving posts in the ground, for use in motor-driven hand tools, and a method for its production.

In 1 an earth auger 1 according to the invention with a connection element 3, a spiral-shaped base body 2 and a cutting head 4 is shown. The spiral-shaped base body 2 is formed by a twisted rectangular sheet metal strip 8, at one end of which there is a connecting element 3 with which the auger 1 can be fixed in a motor-driven hand tool.

At the opposite end, a cutting head 4 is provided, which is formed by bending two sections in opposite directions, which result from a central incision 7 .

To produce the auger 1 according to the invention, a metal strip 8 of the appropriate length, width and thickness is first cut and provided with a connecting element 3 . The connection element is preferably attached by welding a prismatic body, preferably a hexagonal section, to the metal strip 8 ( 2 ).

The sheet metal strip 8 prepared in this way is placed in a twisting device, which is shown schematically in 3 is shown clamped. This essentially consists of a stationary part 6 and a movable part 5 for receiving the metal strip. By rotating the moving part 5 of the twisting machine, the sheet metal strip is twisted about its longitudinal axis and thus forms the spiral-shaped base body 2 of the auger.

Thus, it is possible to manufacture a simple auger inexpensively.

Reference List

1

auger

2

body

3

connection element

4

cutting head

5

moving part of the twisting device

6

fixed part of the twisting device

7

incision

8th

sheet metal strips

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 1719343 U [0005]
• DE 1721033 U [0006]
• DE 1969822 U [0007]
• DE 202017001764 U1 [0008]
• DE 20218345 U1 [0009]

Claims (9)

Earth auger with a connection element that can be fixed in a receptacle of a motor-driven machine, a spiral-shaped base body and a cutting area provided at the opposite end of the earth auger, characterized in that the spiral-shaped base body (2) consists of a rectangular or conical sheet metal strip (8). corresponding length, width and thickness, which is brought into a spiral shape by twisting around the longitudinal axis by means of a twisting device, and has a connecting element (3) on one side of the twisted metal strip (8) and a cutting head (4) on the opposite side. auger after claim 1 , characterized in that the connecting element (3) is connected to the metal strip (8) by welding. auger after claim 1 , characterized in that the connection element (4) is formed by forging out the end of the metal strip (8) opposite the cutting head (4). auger after claim 1 until 3 , characterized in that the connecting elements (3) have a cylindrical or prismatic shape. auger after claim 1 until 3 , characterized in that the connecting element (3) is designed as an SDS shaft. auger after claim 1 until 5 , characterized in that the sheet metal strip (8) has an incision (7) on its side opposite the connecting element (3) and the two sections are bent in opposite directions to form a cutting head (4). auger after claim 1 until 6 , characterized in that oppositely curved sections of the cutting head (4) are hardened or provided with a wear protection layer. Process for the manufacture of an earth auger according to claims 1 until 7 , characterized in that in a first step a metal strip (8) of appropriate length and thickness is cut, in a second step this is connected to a connecting element (3) and in a third step by twisting the metal strip (8) by means of a twisting device its longitudinal axis is brought into a spiral base body (2). Process for the production of an earth auger according to the claim 8 , characterized in that an incision (7) is made in the metal strip (8) on the opposite side of the connecting element (3) and the two sections are bent in opposite directions by a certain angle.

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