EP3289162B1 - Ice drill - Google Patents

Description

The invention relates to an ice drill according to the preamble of claim 1.

Ice drills are drills which are designed and designed to drill holes in snow, ice or mixed conditions of snow and ice. Such drills are therefore usually used in the wild, with a typical application for such drills is the setting of perimeter poles or course poles on a ski slope in the mountains. The ice drill is operated by means of a Akkubohrmaschine.

Known ice drills are similar to a longitudinally twisted sheet metal strip, which has at one end a clamping area for placement in the chuck of a drill, and which has at the other end a cutting area, which is formed integrally with the helical part.

It is further known an ice drill, which has a plastic body, and a tip made of hard metal.

From the US2006 / 254818A1 , the US7946355 F1 , the US5213170 A and he WO2006 / 062453 A1 In each case ice drills are known according to the general state of the art.

The object of the invention is therefore to provide an ice drill of the type mentioned, with which the mentioned disadvantages can be avoided, and which simplifies the drilling of holes in snow or ice in the mountains. This is achieved by the features of claim 1 according to the invention. As a result, an ice drill can be created, which has a low mass, and is transportable in the mountains with little effort. The ice drill in question requires only a low drive power, whereby the battery of a battery drilling machine is charged only slightly, and can be drilled with a single charge a large number of holes before the battery in question must be renewed. As a result, due to the lower required battery load, the transport effort continues to decrease, since no replacement battery must be carried, whereby the drilling of holes in ice or snow in the mountains or under Arctic conditions is further simplified. The torsional stiffness of the light metal body has, together with the cutting performance of Hard metal cutting plates proved to be advantageous for the required drive power. The subject ice drill has a long life and a high security against breakage, whereby the risk of injury decreases.

The subclaims relate to further advantageous embodiments of the invention.

It is hereby expressly referred to the wording of the claims, whereby the claims at this point are incorporated by reference into the description and are considered to be reproduced verbatim.

Fig. 1

eine erste Ausführungsform eines gegenständlichen Eisbohrers im Grundriss;

Fig. 2

den Eisbohrer gemäß Fig. 1 im Aufriss;

Fig. 3

eine zweite Ausführungsform eines gegenständlichen Eisbohrers im Grundriss;

Fig. 4

den Eisbohrer gemäß Fig. 3 im Aufriss; und

Fig. 5

eine dritte Ausführungsform eines gegenständlichen Eisbohrers im Grundriss

The invention will be described in more detail with reference to the accompanying drawings, in which only preferred embodiments are shown by way of example. Showing:

Fig. 1

a first embodiment of a subject ice drill in plan view;

Fig. 2

the ice drill according to Fig. 1 in the elevation;

Fig. 3

a second embodiment of an objective ice drill in plan view;

Fig. 4

the ice drill according to Fig. 3 in the elevation; and

Fig. 5

a third embodiment of a subject ice drill in plan

The Fig. 1 to 5 each show an ice drill 1 with a one-piece light metal base body 2, which light metal base body 2 has a helical part 3 and a subsequent to the helical part 3 cutting part 4, wherein the cutting part 4 at least one carbide cutting plate 11, 12, 13 which is interchangeable attached to the light metal base body 2 ,

As a result, an ice drill 1 can be created, which has a low mass, and is transportable in the mountains with little effort. The respective ice drill 1 requires only a low drive power, whereby the battery of a battery drill is only slightly loaded, and can be drilled with a single charge a large number of holes before the battery in question must be renewed. As a result, due to the lower battery load required further transport costs, since no Austauschakku must be carried, thereby drilling holes in ice or snow in the mountains or under Arctic conditions is further simplified. The torsional rigidity of the light metal base body 2 has proved to be advantageous for the required drive power together with the cutting performance of the carbide cutting plates 11, 12, 13. The subject ice drill 1 has a long life and a high security against breakage, whereby the risk of injury decreases.

The subject ice drill 1 is intended for drilling holes in snow, ice and mixed conditions between snow and ice, such as firn. The ice drill 1 is provided in particular for operation with a machine, therefore a drill, in particular a Akkubohrmaschine. A manual operation, such as by means of a hand crank, is preferably not provided.

The ice drill 1 has a one-piece light metal base body 2. An aluminum alloy, for example from the AlZnMgCu alloy group, is preferably provided as the light metal alloy. Furthermore, titanium alloys, such as TiAl6V6Sn2 or TiAl4Mo4Sn2, or magnesium alloys, such as MgAl6Zn or MgAl8Zn, are preferably provided.

The light metal base body 2 has a helical part 3 and a cutting part 4, wherein - in the longitudinal extension or in the direction of a rotation axis 16 of the ice drill 1, the cutting part 4 is arranged or formed adjoining the spiral part 3.

As a helical part 3 while the part of the light metal base body 2 is referred to, which helices 6, 7 or spirals, which are helical or helix arranged accordingly. Preferably, the coil part 3 at least a first coil 6 and a second coil 7, wherein a larger number of coils 6, 7 may be provided.

The coils 6, 7 may have different cross-sectional shapes, wherein it is preferably provided that all coils 6, 7 of an ice drill have identical cross-sectional shapes. In this case, cross-sectional shapes can be provided, which are bordered by straight lines and / or curves. Prefers it is provided that the helices 6, 7 have a rectangular, in particular square, triangular, trapezoidal or round, approximately similar to a round thread, cross-section. It is particularly preferred that the coils 6, 7 each have a substantially trapezoidal cross-section.

It is therefore not intended that only one of the two coils 6, 7 extends over the entire length of the coil part 3, and another of the two coils 6, 7th only over a part of this length.

The subject ice drill 1 will be described with reference to the two preferred embodiments, each with two coils 6, 7. Embodiments with a larger number of coils 6, 7 are preferred according to the first embodiment of an ice drill 1 according to the Fig. 1 and 2 train.

The light metal base body 2 or in particular the helical part 3 has a so-called. Soul 5 on. In this case, the core 5 is a region arranged around the axis of rotation 16 of the ice drill 1, which in particular has a substantially circular cross-section and to which the coils 6, 7 are integrally formed or together with which the coils 6, 7 are integrally formed are formed. Seen alone, the core 5 preferably has the shape of a cylinder.

Furthermore, it can be provided that the core 5 has a cross-section formed essentially as a regular polygon, in particular a triangle, a square or a hexagon.

It is preferably provided that the light metal base body 2 is produced by milling from a semi-finished light metal, wherein a production by die casting may also be provided.

As already explained, the coils 6, 7 each preferably have a substantially trapezoidal cross-section. It is provided in particular that a width of the first coil 6 and / or the second coil 7 at the transition of the respective coil 6, 7 to the soul 5 is less than a diameter of the soul 5. In particular, it is provided that the width in question is smaller, as a Radius of the soul 5.

It is preferably provided that the core 5 has a diameter which is 2.5 to 3.5 times as large as a width 20 of the first and / or second coil 6, 7. The coils 6, 7 therefore have a relative to Diameter of the soul 5 large width 20. The width 20 of the coils 6, 7 is to be determined in a classical manner by means of a caliper, and in Fig. 2 entered.

The part of the ice drill 1 or of the light metal base body 2, which has or bears the cutting edges of the ice drill 1, is designated as the cutting part 4. The cutting part 4 is then arranged on the helical part 3 of the light metal base body 2. In this case, the helical part 3 passes directly into the cutting part 4.

The cutting part 4 has at least one hard metal cutting plate 11, 12, 13, which is exchangeably fixed to the light metal base body 2. It is preferably provided that the at least one hard metal cutting plate 11, 12, 13 is screwed to the cutting part 4. It is particularly preferably provided that each carbide cutting plate 11, 12, 13 with at least one fastening screw 21, preferably with two fastening screws 21, on the cutting part 4, in particular the carbide cutting plate holder 9, 10, is attached. Preferably, the at least one fastening screw 21 is designed as a nickel-plated steel screw.

It is preferably provided that the first helix 6 in the cutting part 4 merges into a first carbide cutting plate holder 9 of the cutting part 4, and that the second helix 7 in the cutting part 4 merges into a second carbide cutting plate holder 10 of the cutting part 4. It is particularly preferably provided that the first coil 6 is formed in the cutting part 4 as the first carbide cutting plate holder 9 of the cutting part 4, and that the second coil 7 is formed in the cutting part 4 as a second carbide cutting plate holder 10 of the cutting part 4. The carbide cutting plate holders 9, 10 thereby close off the respective helix 6, 7 at one end of the ice drill 1.

The carbide cutting plate holders 9, 10 are designed to be one Carbide cutting plate 11, 12, 13 to take or wear. Carbide cutting plates 11, 12, 13 are known per se, and are for example also referred to as inserts. These are widely used in metal cutting, for example. Preferably, the carbide cutting plate holder 9, 10 a contact surface for a carbide cutting plate 11, 12, 13, and at least one stop for the carbide cutting plate 11, 12, 13. The carbide cutting plate 11, 12, 13 is in a conventional manner on the carbide cutting plates -Halter 9, 10 bolted. It is preferably provided that the contact surface is arranged substantially parallel to the axis of rotation 16 of the ice drill 1.

Preferably, the carbide cutting plate 11, 12, 13 used in the region of the front side of the ice drill 1, a clearance angle of about 20 °, and on the side surfaces on a clearance angle of about 10 °.

In the transition from carbide cutting plate holder 9, 10 to the respective helix 6, 7, a groove is preferably arranged, which supports the removal of the overburden from the wellbore.

The Fig. 1 and 2 show a first embodiment of an objective ice drill 1. Here, a first hard metal cutting plate 12 is attached to the first carbide cutting plate holder 9. On the second carbide cutting plate holder 10, a second carbide cutting plate 13 different from the first carbide cutting plate 12 is attached.

The two hard metal cutting plates 12, 13 are spaced from each other to only cut an annular area when drilling a hole and the corresponding cutting operation by the carbide cutting plates 12, 13. It is therefore preferably provided that a first cutting edge 14 of the first hard metal cutting plate 12 and a second cutting edge 15 of the second hard metal cutting plate 13 are each spaced from a rotation axis 16 of the ice drill 1. Between the two carbide cutting plates 12, 13 and their respective cutting edges 14, 15, therefore, a distance or an exemption range is arranged. It has been shown that this achieves a particularly good drilling performance of the ice drill 1 can.

It is preferably provided that a ring width of the annular region is between 35% and 40% of an overall diameter of the ice drill 1. The circular center area which is not cut by the hard metal cutting plates 12, 13 therefore has a diameter between 20% and 30% of the total diameter of the ice drill 1.

Furthermore, it is preferably provided that the first cutting edge 14 and the second cutting edge 15 are each formed convex, in particular substantially circular, for cutting a rounded annular groove. Fig. 1 shows correspondingly formed cutting edges 14, 15. It has been shown that such cutting edges 14, 15 compared to classic pointed drills have a high cutting performance in ice, and allow a good removal of the overburden.

This is further supported by the fact that the first hard metal cutting plate 12 and the second hard metal cutting plate 13 are each arranged substantially parallel to the axis of rotation 16 of the ice drill 1.

Fig. 5 shows a third embodiment of an objective ice drill 1, wherein the first hard metal cutting plate 12 and the second hard metal cutting plate 13 are respectively directed towards the axis of rotation 16 of the ice drill 1 or arranged obliquely. In this case, provision is made in particular for a substantially straight side edge of the first or second carbide cutting plate 12, 13 or an areaymmetric axis of the first or second carbide cutting plate 12, 13 to have an angle between 25 ° and 30 ° to the axis of rotation 16 of the ice drill 1.

In the area between the first hard metal cutting plate 12 and the second hard metal cutting plate 13, a chisel-like center region 17 is arranged. The chisel-like center region 17 has, in particular, the shape of a wedge whose edge points in the direction of the cutting edges 14, 15. The chisel-like center region 17 is preferably spaced apart from the first cutting edge 14 and / or the second cutting edge 15 in the direction of the helical part 3, in particular by 35% to 40% of the total diameter of the ice drill 1. The chisel-like center region 17 thereby grinds the part of the ice which is not cut by the cutting edges 14, 15. However, when the annular portion is cut, the intermediate portion is broken up, which can be easily pushed away by the chisel-type center portion 17.

Preferably, it is further provided, in particular as a more detailed characterization of the convex cutting edges 14, 15, that the first cutting edge 14 and the second cutting edge 15 at least partially, in particular substantially over half its width, are formed to chisel-like center region 17 extending.

The 3 and 4 show a second embodiment of an objective ice drill 1. In this second embodiment, it is preferably provided that the at least one hard metal cutting plate 11, 12, 13 is formed as a single, continuous hard metal cutting plate 11, which on both the first carbide cutting plate holder 9 and the second hard metal cutting Holder 10 is attached. This embodiment has by the single, continuous cutting plate 11 a simpler structure.

Particularly preferably it is provided that the carbide cutting plate holders 9, 10 are formed such that both the arrangement of two carbide cutting plates 12, 13 according to the first embodiment, as well as arranging only a single common cutting plate 11 according to the second embodiment is possible.

At a side facing away from the blade part 4 of the light metal base body 2, a shaft 8 is connected thereto. The shaft 8 is provided for attachment of the ice drill 1 to a drill. The shaft 8 may be formed differently in terms of its geometry, in particular, the shaft may be cylindrical or formed as a regular prism with three or six side surfaces, or according to the SDS Plus or SDS Max system.

The shank 8 is preferably interchangeably connected to the light metal base body 2, in particular screwed thereto, whereby an adaptation of the Ice drill 1 to different chucks different drills is possible. To secure the screw connection, a lock nut or another screw locking element can be provided.

Preferably, the subject ice drill 1 is integrally formed except for the shank 8 and the at least one hard metal cutting plate 11, 12, 13.

Furthermore, it is preferably provided that the light metal base body 2 at least partially, in particular substantially completely, has an anodized surface. In addition to effective abrasion protection, the ice drill 1 can be colored by means of such a surface treatment. This is an important help in the field work in the mountains or on expeditions against the loss of the ice drill.

Claims (14)

1. Ice drill (1), comprising an integral light-metal base body (2), which light-metal base body (2) has a helical part (3) and a cutting part (4) adjoining the helical part (3), characterized in that the cutting part (4) has at least one hard-metal cutting plate (11), 12, 13), which is exchangeably fastened to the light-metal base body (2), that the helical part (3) has at least a first helix (6) and a second helix (7), that the first helix (6) and the second helix (7) are arranged over the entire length of the helical part (3), that the first helix (6) in the cutting part (4) is designed as a first hard metal cutting plate holder (9) of the cutting part (4), and that the second helix (7) in the cutting part (4) is designed as a second hard metal cutting plate holder (10) of the cutting part (4), that a first hard metal cutting plate (12) is fastened to the first hard metal cutting plate holder (9), and that a second hard metal cutting plate (13) different from the first hard metal cutting plate (12) is fixed to the second hard metal cutting plate holder (10), and that the first and second hard metal cutting plates (12, 13) are arranged spaced apart from each other for cutting a merely annular region.
2. Ice drill (1) according to claim 1, characterized in that the helical part (3) has a core (5), in particular a substantially cylindrical core.
3. Ice drill (1) according to claim 1 or 2, characterized in that the first helix (6) and the second helix (7) each have a substantially trapezoidal or rectangular cross-section.
4. Ice drill (1) according to claim 1, 2 or 3, characterized in that the at least two helices (6, 7) are formed integrally with the core (5).
5. Ice drill (1) according to claim 4, characterized in that the core (5) has a diameter which is 2.5 to 3.5 times as large as a width (20) of the first and/or second helix (6, 7).
6. Ice drill (1) according to one of claims 1 to 5, characterized in that the ice drill (1) has a shank (8) for fastening the ice drill (1) to a drilling machine, and that the shank (8) is exchangeably connected to the light-metal base body (2), in particular screwed thereto.
7. Ice drill (1) according to one of claims 1 to 6, characterized in that a first cutting edge (14) of the first hard metal cutting plate (12) and a second cutting edge (15) of the second hard metal cutting plate (13) are each arranged spaced from an axis of rotation (16) of the ice drill (1).
8. Ice drill (1) according to one of claims 1 to 7, characterized in that an annular width of the annular region is between 35% and 40% of a total diameter of the ice drill (1).
9. Ice drill (1) according to one of claims 1 to 8, characterized in that the first cutting edge (14) and the second cutting edge (15) are each convex, in particular substantially in the form of a circular line, for cutting a rounded annular groove.
10. Ice drill (1) according to one of claims 1 to 9, characterized in that the first hard metal cutting plate (12) and the second hard metal cutting plate (13) are each arranged substantially parallel to the axis of rotation (16) of the ice drill (1).
11. Ice drill (1) according to one of claims 1 to 10, characterized in that a chisel-like center region (17) is disposed between the first hard metal cutting plate (12) and the second hard metal cutting plate (13).
12. Ice drill (1) according to claim 11, characterized in that the chisel-like center region (17) is arranged spaced apart from the first cutting edge (14) and/or the second cutting edge (15) in the direction of the helical part (3), in particular by 35% to 40% of the total diameter of the ice drill (1).
13. Ice drill (1) according to claim 11 or 12, characterized in that the first cutting edge (14) and the second cutting edge (15) are designed to extend at least in sections, in particular substantially over half their width, towards the chisel-like center region (17).
14. Ice drill (1) according to one of claims 1 to 13, characterized in that the light-metal base body (2) has an anodized surface at least in sections, in particular substantially completely.

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