FI87112B - Ice drill - Google Patents

Description

τ .... ν. 87112

James & ira

The invention relates to an ice drill comprising a shank part, a rotating member at its upper end, for example a crank and a lifting spiral of an ice guide 5 at the lower part and one or more spirally cutting grinding blades at the lower end, where the imaginary rotating body of each blade is substantially conical.

Known ice augers generally have 10 blades made of sheet steel. Here, the steel plates attached to the end of the rod are helically bent and the blades are formed at the end of the spiral by sharpening the end of the plate obliquely. The blade member itself is usually a removable component that is fastened to the lower end of the tubular shaft by a quick release. The lower part of the shaft includes 15 helical plate strips, the function of which is to lift the ice guide out of the hole. The upper end of the shank usually includes a crank from which the drill shank is rotated and with it the roughing blades. As a result, the roughing blades begin to break the ice so that they protrude into the ice along a spiral path. The blades 20 themselves and the spiral formed in the lower part of the shaft as its extension lift up the detached ice guide.

Various ice augers are known from Finnish patents Nos. 20569, 26335 and 47931 and application No. 1607/69. 25 In addition to the roughing blade, other blades are used to improve the cutting effect and to provide a smooth cutting surface.

The object of the present invention is to improve the shear efficiency of an ice auger compared to currently used ice augers. The characteristic features of the invention are set out in the appended claims. According to the invention, the effect of the vertical cutting blade on the side of the roughing blade is very significant in an ice machining operation.

: · * · 35 In the following, the invention is illustrated by the example shown in the accompanying figures.

Figure 1 shows a side view of a blade section of an ice auger according to the invention 40 Figure 2 shows a blade section seen from below 2 87112

In the pictures, only the blade part of the ice auger is shown. The blade component 1 is attached to the lower part of the shaft 2 in a known manner. The lower part of the arm 2 includes a helical plate strip which lifts the detached ice guide. The blade component has 5 additional fasteners 5, from which it can be firmly locked in the lifting strip plate strip, if necessary. The blade component consists mainly of disc strips welded to the side of the shaft journal, which are bent into a helical shape and the ends of which are chamfered so as to form roughing blades 3.

10

It can be seen in Figure 1 that the roughing blade 3 is slightly curved, but the rotating body generated by it is substantially in the shape of a truncated cone. In this case, about 60 ° behind the roughing blade in the direction of rotation of the roughing blade, there is a vertical cutting blade 4. It is essential that this vertical cutting blade 4 extends slightly lower than the tip of the roughing blade 6. It then cuts a drawing . In practical experiments, it has been found that preferably the cutting blade extends 1-4 mm below the tip of the roughing blade and about 10-15 mm above it.

Comparing the drill according to the invention with known drill types, it has been found in experiments that the drill according to the invention bites into the ice considerably cleaner, quieter and with less force than previous drill types. The edge of the hole made by the drill according to the invention has a smooth surface, while the ordinary drill leaves a jagged mark. The experiments also found that if the vertical blade 4 is at the tip of the roughing blade 6, the advantage to be obtained is small. On the other hand, it is also advantageous to move the vertical blade further away from the roughing steel, so that the roughing blade 3 can be sharpened by conventional methods.

The vertical blade 4 may be made of special steel and may be welded to the blade component as made in the embodiment shown in Figures 1 and 2. On the other hand, it can also be a screw-on detachable blade piece.

Claims (2)

3,87112 1. Isborr, somnenefattar skaftdel, i dess Övre ände ett roteringsorgan, t.ex. in the case of a single screw (2) for which a single spiral is used (3), and for a minimum of 25 up to a maximum level (4) of the scraper (3), shade scrub head rotation stitching is not conical, rotating with screws (4) and placer with screws (3), and screws (4) strap sig 1 - 10 mm under screws (3) 20 mm above 30 denna. An ice auger comprising a shank part, a rotating member at its upper end, for example a crank, and an ice guide lifting spiral 5 (2) at the lower end and one or more spirally cutting grinding blades (3) at the lower end, and at least one substantially vertical cutting blade (4) on the outer edge of the roughing blade (3) , and wherein the intended rotating body of each roughing blade is a substantially conical surface, characterized in that the cutting blade (4) is located behind the roughing blade (3), at a distance of 15-190 ° from the roughing blade (3), and that the cutting blade (4) extends 1 - 10 mm below the outer tip of the roughing blade (3) and 5 to 20 mm above it. Ice drill according to Claim 1, characterized in that the drill comprises two symmetrically arranged roughing blades (3) and cutting blades (4) arranged at a distance of 30 to 50 ° from them on the outer edge of the roughing blades (3). 20 2. A method according to claim 1, which comprises a symmetrical placebo scraper (3) and at the end of a 30-50 ° placer (4) having a screw cap (3).