RU232336U1 - KNIFE SHARPENING DEVICE - Google Patents

Abstract

The utility model relates to auxiliary devices for sharpening the cutting edges of blades, for example, hand or table knives. The proposed device can be used as a device for sharpening the cutting edges of knives by performing reciprocating movements. The device comprises a housing, a sharpening groove, a vacuum suction cup, a rotary handle, wherein in the front part of the housing there are hard alloy plates arranged at an angle, forming a sharpening groove between themselves, located perpendicular to the axis of symmetry of the knife sharpening device, wherein the distance from the lower support surface to the sharpening groove is 8 mm. The technical result is a reduction in the overturning moment. 6 fig.

Description

The utility model relates to auxiliary devices for sharpening the cutting edges of blades, such as hand or table knives. The proposed device can be used as a device for sharpening the cutting edges of knives by performing reciprocating movements.

A device for sharpening the blades of household cutting tools is known (RU Patent for Invention No. 2036067, published on May 27, 1995), in the body of which the working elements and a unit for changing their angular position are placed, made in the form of two handles located on an axis with axial grooves and protrusions, and the body is made in the form of two parts fastened to each other with symmetrical cutouts, on the side faces of which vertical recesses are made, while the working elements are installed in the grooves of the handles, which are placed in the cutouts of the body with the possibility of fixing them by means of protrusions in the vertical recesses.

The disadvantage of the described design is the impossibility of fixing it on any surfaces, which leads to the need to hold the body of the device for sharpening knives.

A number of designs of sharpeners with a vacuum suction cup are known from open sources, eliminating the drawback described above, for example: - universal sharpener with a vacuum suction cup 60×43 mm FIT 10825 (https://fit-russia.ru/product/tochilka-universalnaja-s-vakuumnoj-prisoskoj-60h43-mm-fit-10825/);

- a device for sharpening knives SIBRTEKH 79112 (https://sibrtec-instrument.ru/product/prisposoblenie-dlja-zatachivanija-nozhej-ljubogo-tipa-kreplenie-na-prisoske-sibrteh-791121), etc.

The above-described similar designs consist of a body that is attached to a flat, smooth and hard surface using a rubber suction cup, and a hard alloy in the form of cutting plates is used as sharpening stones. To fix the vacuum suction cup, it is necessary to lower the handle to a horizontal position, which, in turn, will move the rod upward. When the rod moves vertically, a closed volume is formed between the surface on which the sharpener is fixed and the suction cup, creating a vacuum, and the sharpening device is fixed on the surface.

A common drawback of the described designs is the insufficient reliability of their fixation on the working surface due to the overturning effect of the bending moment arising from the cutting forces applied at the point of contact between the sharpened blade and the cutting carbide plates.

The objective of the utility model is to increase the reliability of fixation on the working surface of the knife sharpening device.

The technical result is achieved in that the knife sharpening device contains a housing, a sharpening groove, a vacuum suction cup, a rotary handle, in the front part of the housing there are hard alloy plates arranged at an angle, forming a sharpening groove between them, located perpendicular to the axis of symmetry of the knife sharpening device, which significantly reduces the tipping moment.

The design of the knife sharpening device is illustrated by drawings. Fig. 1 shows a frontal view of the knife sharpening device, Fig. 2 shows a profile view of the knife sharpening device, Fig. 3 shows a section B-B of the knife sharpening device, Fig. 4 shows a view A of the knife sharpening device, Fig. 5 and 6 show the location of the chip groove on the knife sharpening device.

The proposed design of the knife sharpening device includes a housing 1 made of a polymer material, inside of which a rubber vacuum suction cup 2 is placed on the lower side. Inside the vacuum suction cup 2, a rod 3 is located, which is connected to a rotary handle 4 via an axis (not indicated in the figure). The handle 4 is located along the central axis of the housing 1 in such a way that it can have a vertical and horizontal position. When the handle 4 is rotated, the rod 3 has the ability to move vertically. In the front part of the housing 1, plates 5 made of hard alloy are located at an angle β, forming a V-shaped sharpening groove between themselves, located perpendicular to the axis of symmetry of the knife sharpening device. The distance from the lower support surface to the V-shaped sharpening groove can be in the range from 4 to 10 mm. In addition, in the front part of the housing 1 there is a groove 6 for removing chips, located perpendicular to the axis of symmetry of the knife sharpening device. In the lower part of the housing 1 there is a rubber insert 7, preventing the device from slipping relative to the surface. In the housing 1 there are also recesses 8 for convenient holding of the knife sharpening device in the hands.

The knife sharpening device operates as follows. The device is mounted on a flat and hard surface so that the rubber insert 7 and the rubber vacuum suction cup 2 are located in the same plane. Handle 4 is first moved to a vertical position. When handle 4 is moved from a vertical to a horizontal position, rod 3 moves vertically and pulls the central part of the vacuum suction cup 2 upward. A closed volume is formed between the surface on which the sharpener is fixed and suction cup 2, creating a vacuum, thus fixing the sharpening device on the surface. After fixing the knife sharpening device on the surface, the blade to be sharpened is placed between hard alloy plates 5, which form a V-shaped sharpening groove with a sharpening angle β. Reciprocating movements are imparted to the blade, and the resulting chips fall into groove 6 and are removed from the cutting (sharpening) area. During the sharpening process, at the point of contact of the sharpened blade with the plates 5 made of hard alloy, a cutting force arises, which is located at a distance of 4 to 10 mm from the working surface on which the knife sharpening device is fixed. As a result, a tipping moment arises, which tends to tear the device off the surface. The body 1 of the knife sharpening device can be additionally fixed on the surface by hands located in the recesses 8.

The positive effect is achieved by the fact that in the front part of the body there are hard alloy plates arranged at an angle, forming a sharpening groove between them. In this case, the resulting groove is located perpendicular to the axis of symmetry of the device. This arrangement provides a significantly smaller distance from the lower support surface to the sharpening groove than in the prototype, which can be in the range from 4 to 10 mm. Such a small shoulder significantly reduces the value of the overturning moment.

Claims (1)

A knife sharpening device comprising a housing, a sharpening groove, a vacuum suction cup, a rotary handle, characterized in that in the front part of the housing there are hard alloy plates arranged at an angle, forming a sharpening groove between them, located perpendicular to the axis of symmetry of the knife sharpening device, wherein the distance from the lower support surface to the sharpening groove is 8 mm.