RU2561750C1 - Cutting knife for ice drill - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: cutting knife is made in the form of a plate with holes for attachment and cutting edges formed by intersection of chamfered surfaces on front and lateral sides with the lower plane. The front cutting edge is distributed at least in three sections unequally located from longitudinal axis. In each distributed section of the front cutting edge there are toothed cutters.

EFFECT: improving productivity of an ice drill.

4 cl, 4 dwg

Description

The invention relates to the field of fishing, in particular, to designs of devices for knives for ice drills for drilling holes in ice.

Known cutting knife for ice drill, see the patent for the invention of the Russian Federation No. 2416059 M.cl. F25C 5/02, B01C 18/00, publ. 04/10/2011, containing a housing with mounting holes, sharpening planes and cutting edges, the cutting knife is made in the form of a solid figure formed by three planes intersecting each other at obtuse angles, forming an undercut on the underside of the knife, while the first plane has holes for attaching the knife to the ice drill, and on two obliquely adjacent planes there is a sharpening plane with a cutting edge parallel to the first plane at a distance equal to the thickness of the first plane plus 4-10 mm. The obtuse angle between the planes is made equal to 140-170 °. Along the line of intersection of the planes, rounding was performed with a radius of 1 to 10 mm. The cutting edge of the knife, formed by sharpening at the intersection of the outer surfaces of two planes inclined to the first, is made with a radius of 1 to 10 mm. The angle between the lines of intersection of the first plane with two other planes is made equal to 70-90 °.

The disadvantages of the known knife include low cutting properties, which consist in exposing the ice to the entire length of the knife’s cutting edges, which increases the drilling force of the holes by cleaving sufficiently large fragments of ice.

Known more advanced cutting knife used in the ice drill according to the patent of the Russian Federation No. 53104 - prototype, publ. 05/10/2006, containing a screw, a cutting head fixed to one end of its axis, having a central part, with a groove made in it, and side parts symmetrically displaced in opposite directions relative to the horizontal axis of the head, on which there are bevelled from the central part to the periphery there are made working surfaces, knives fixed on said beveled working surfaces towards each other so that their cutting edges protrude into said groove, and a rotor fixed on the second end of the screw axis, while working the surface on the lateral parts of the cutting head is single-stage and additionally beveled in opposite directions relative to the horizontal axis of the head, one knife is fixed on each working surface, the knives are fixed so that their tilt angles correspond to the bevel angles of the working surfaces, while the tilt angles of the knives corresponding to the angles additional bevels of the working surfaces are 6–9 °, and the tilt angles of the knives corresponding to the tilting angles of the working surfaces from the center to the periphery are 14–16 °. The cutting knives are made in the form of plates with two cutting edges formed by the intersection of the side inclined (beveled) planes and the lower supporting plane and the holes for mounting them on the cutting head.

The disadvantages of the known knives of the ice drill can also include the impact on ice of the working surfaces of the cutting head along their entire length, which increases the load on the knives when drilling ice and, accordingly, increases the drilling force and reduces productivity.

The technical result of the invention is to reduce the load on the cutting knives of the ice drill, reduce the efforts of drilling holes and increase productivity.

The technical result is achieved by combining the use of well-known features, such as making a cutting knife in the form of a plate with holes for mounting it on the ice head of the ice drill with cutting edges formed by the intersection of the angled (chamfered) surfaces on the front and side sides of the knife with its lower plane, with new features, namely that the front cutting edge of the knife is made distributed at least three different from the longitudinal axis of the knife section, When each allocated to this frontal portion of the cutting edge of the knife are made toothed cutters.

Toothed cutters of the front cutting edge are either rectangular, triangular, or convex, or in the form of their combinations.

At the transition of the front cutting edge portions from one to another, at least one serrated cutter is protruded 0.2-0.8 times the distance between the portions.

The distance "h" between the sections of the distributed cutting edge is made equal to 0.1-0.3 of the width of the knife.

The novelty of the proposed cutting knife is the implementation of the front cutting edge of the knife distributed at least three differently spaced from the longitudinal axis of the knife section, with gears made on each distributed section of the front cutting edge of the knife.

So, the implementation of the front cutting edge of the knife distributed at least three differently spaced from the longitudinal axis of the knife section allows you to distribute the load when drilling ice by acting on it with sharp cutting edges of each section at different distances from the longitudinal axis of the knife and thereby distributing the forces of the impact of the knives on ice and making drilling easier.

Execution of gear teeth on each section of the cutting edge allows sharp point-to-tip edges of the gear teeth to first prick ice in a small area, and then with sharp sides of the gear teeth to finally chip it and separate it from the main mass, reducing overall ice drilling efforts and increasing drilling performance.

Signs of the performance of the gear teeth of the front cutting edge either rectangular, triangular, or convex or in the form of their combinations, the implementation at the transition of sections from one to another, at least one gear tool length protruding and equal to 0.2-0.8 the distance between the sections, as well as the implementation of the distance "h" between the sections of the cutting edges equal to 0.1-0.3 of the knife width, supplement and specify the conditions for achieving the technical result set by the invention, which consists in reducing the drilling force l when exposed to the cutting edges of the knife.

According to the patent information research, no combination of known and new features of the present invention was found in the sources of patent and scientific and technical information, which makes it possible to attribute the combination of the proposed features to novelty ones.

Since the proposed combination of features is not known from the existing level of technology and does not follow from it explicitly, and allows you to get a higher and even unexpected result, the proposed essential features and their combination can be considered to have an inventive step.

The description of the implementation of the proposed method, including a specific example, allows it to be attributed to industrially feasible.

In FIG. 1 schematically shows the proposed cutting knife for ice drill.

In FIG. 2 shows a knife top view.

In FIG. 3 shows a knife side view.

In FIG. Figure 4 shows the shapes of the cutting edges of the teeth, a) with rectangular gear teeth, b) with oval teeth, c) with alternating oval and rectangular teeth, d) with alternating oval, rectangular and triangular teeth.

Proposed as an invention, the knife is made in the form of a plate 1 with a side bevel 2 and frontal bevels 3 and 4, forming the cutting edges 5, 6, 7 of the knife when they intersect with its lower plane. The extreme front cutting edges of the gear teeth of the knife 6 and 7, as well as the rows of gear teeth of the distributed sections are made parallel to the longitudinal axis 8, on which holes 9 are made with a countersink 10 for attaching the knife to the cutting head of the ice drill. The side cutting edge 5 of the knife is made at an angle β to the longitudinal axis of the knife, equal to 75-90 °. The front cutting edges of the gears 6, 7, the rows of sections of the cutting edges of the gears 11 are made distributed at least three distances that are different from the longitudinal axis 8 of the knife. The cutting edges of the gears 6, 7 and the rows of sections 11 can be made rectangular 12, triangular 13, or convex 14 shapes or in the form of combinations thereof, see FIG. 4. In the transition of one row 11 with gear teeth 13 to another, at least one gear 15 is made protruding from the row by 0.2-0.8 distance between the rows of gear teeth. The holes 9 with a countersink 10 for attaching the knife to the cutting head of the ice drill are made on the center line 7.

The knife proposed as the invention works as follows: After fixing the knives on the cutting head of the ice drill, ice is drilled. In this case, during the rotation of the cutting head, the knives with the cutting edges 5, 6, 7, as well as the cutting edges of the rows 11 of the gears 13 and the cutting gear 15 begin to chip the ice. Since the gear teeth have a triangular, or rectangular, or convex shape or a combination of these forms, when interacting with ice, the sharp tops of these gear teeth act on the ice first, thereby reducing the drilling force, and then their inclined sides, continuing to chip already incised and ice pinned by the tops. Acting on the ice in rows of 11 gears, made at different distances from the longitudinal axis 8 of the cutting knife, the ice easily breaks off, crumbles and is separated from its main mass. The extreme cutting edges of the knife 6 and 7 cut and align the hole in the ice. The central gear cutter 15, made protruding, allows you to make the easiest incision and cleavage of ice between the rows and thereby reduce, in combination with all cutting edges and rows of gear teeth, the drilling force of ice.

The implementation of the gear teeth of each section of the cutting edge of a rectangular, triangular, or convex shape or in the form of their combinations allows, depending on the requirements for drilling and drilling conditions for holes, for example, if there are particles of sand, grass, reeds, etc. on the ice, more efficient, low-effort execution of holes in ice.

Performing at the transition of the sections from one to the other, at least one serrated tooth protruding along the length of 0.2-0.8 distances between the sections allows to more effectively reduce the drilling force. When the length of the toothed middle incisor is less than 02 and more than 0.8, the distance between sections or rows of gear incisors reduces the drilling forces almost no effect. The implementation of the distance "h" between the rows of cutting edges equal to 0.1-0.3 of the width of the knife allows you to effectively distribute the drilling force when chipping ice with the cutting edges of the knife. This contributes to the achievement of the technical result set by the invention, which consists in reducing the drilling force of ice when exposed to the cutting edges of the knife.

Currently, the author has made several prototypes of the proposed knives for ice drills and tested when drilling ice of various thicknesses from 30 cm to 90 cm. Preliminary tests of the knives showed positive results.

It was decided to start production of ice drills with the proposed knives in the fourth quarter of 2014.

Claims (4)

1. The cutting knife for the ice drill, made in the form of a plate with holes for mounting it on the cutting head with cutting edges formed by the intersection of the angled (beveled) surfaces on the front and side sides of the knife with its lower plane, characterized in that the front cutting edge the knife is made distributed at least three different from the longitudinal axis of the knife section, while on each distributed section of the front cutting edge of the knife is made of gear teeth. 2. The cutting knife according to claim 1, characterized in that the gear teeth of the front cutting edge are either rectangular, triangular, or convex, or in the form of combinations thereof. 3. The cutting knife according to claim 1, characterized in that at the transition of the sections of the frontal cutting edge from one to another, at least one serrated cutter is protruded 0.2-0.8 times between the sections. 4. The cutting knife according to claim 1, characterized in that the distance "h" between the sections of the distributed cutting edge is made equal to 0.1-0, 3 knife widths.

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