Device for sharpening knives

Abstract

The invention relates to devices for sharpening the cutting edges of handheld knives or table knives. The device comprises a base which is fastened to a support and has fastened thereto a pivotable carriage with a frame, the frame having knife clamps mounted thereon and being capable of rotating about a horizontal axis and of being firmly locked in a horizontal position, and the device further having a swivel assembly into which a guide for a holder of an abrasive member can be mounted for rotation. The pivotable carriage consists of a housing and plates with holes. Mounted in a central hole in the housing is an axial pusher which is spring-loaded by a spring and which has a screw fastened in a hole in the end face thereof, the body of the screw being arranged in cooperation with a central hole in the frame. The head of the screw presses the frame to the end face of the pusher. The base, fastened to the support, has a lever mounted therein on a pivot pin, the lever being arranged in cooperation with the pusher to enable longitudinal movement of the pusher. The technical result of the invention is improved sharpening of knives.

Description

[0001] KNIFE SHARPENING DEVICE

[0002] The invention relates to devices that include structural elements of grinding and polishing machines or devices related to frames, carriages, and also adjustable steady rests for precise adjustment of the sharpening angle of the bevels of blade tools, and can be used for sharpening the cutting edges of hand or table knives.

[0003] A knife sharpener with a fixed angle of inclination is known from the prior art, known from the description of a utility model published in the People's Republic of China (CN210678038U, MIC B24B 3 / 36, B24B 41 / 02, B24B 41 / 06, published on 06 / 05 / 2020). The device comprises a holder, which is a table, on the first end of which a ledge is made with the possibility of installing and fixing the knife to be sharpened in it using clamps. At the second end of the holder, a crossbar is installed on a screw, made with the possibility of adjustable vertical movement, to ensure the possibility of adjusting the sharpening angle of the cutting edge of the knife. A horizontally movable holder is installed on the crossbar, on which a hinge housing is fixed, with a guide rod installed in it, with a holder equipped with a handle and an abrasive installed in an open groove.

[0004] The disadvantage of the known technical solution is that the locking mechanism used in the device requires reinstallation of the knife to sharpen both cutting edges, which slows down the work with the sharpener. In addition, using a screw for vertical movement does not provide precise adjustment of the sharpening angle.

[0005] The closest technical solution to the claimed invention and selected as a prototype is a sharpening machine (RU202939U1, IPC B24B 3 / 54, published on 15.03.2021). The machine comprises a housing, knife holders and a hinge housing stand, in which a hinge assembly is mounted on a vertical axis for mounting the abrasive holder guide with the possibility of rotation. In this case, the housing is made in the form of a stand and walls, between which, on an axis equipped with an angle change handle and a locking screw, in radial grooves made in the walls, a turning housing is installed, made with the possibility of adjustable rotation relative to the geometric center of the circle formed by the said radial grooves, while in the turning housing on the axis, a frame is installed, made with the possibility of rotation around a horizontal axis and rigid fixation in a horizontal position, with the said knife holders fixed to it.

[0006] The disadvantage of the known technical solution is its relatively low technological effectiveness, associated with the complex design of the reversal body used to adjust the sharpening angle. In addition, the radial groove is difficult to manufacture, and the screw that fixes its position does not ensure reliable fixation of the reversal body.

[0007] The technical problem that the claimed invention is aimed at solving is to improve the quality of sharpening of cutting edges of cutting blades of hand or table knives.

[0008] The said task is solved in that the knife sharpening device comprises a base fixed to a stand, on which a rotary carriage with a frame is fixed, on which knife clamps are mounted, made with the possibility of rotation around a horizontal axis and rigid fixation in a horizontal position, and a hinged unit for installation in it with the possibility of rotation of the abrasive holder guide. The rotary carriage consists of a body with a central opening and plates fixed to its outer side surfaces, each of which contains openings, the first of which is made with the possibility of its alignment with an axis mounted horizontally in the base, and the second is made with the possibility of installing a screw in it, fixing the carriage on the base.An axial pusher, spring-loaded, is installed inside the central opening of the housing, on the end of which a screw is fixed in the opening, the rod of which is aligned with the central opening of the frame, and the head of the screw is on the side of the knife clamps, pressing the frame to the end of the pusher. Additionally, in the base, fixed on the stand, a lever is installed on the axis, combined with the pusher to ensure the possibility of longitudinal movement of the pusher.

[0009] A positive technical result, provided by the above-disclosed set of device features, is an increase in the sharpening accuracy of knife blades, due to the reliable fixation of the rotary carriage on the base body using screws installed in the holes of the carriage strips, as well as a spring-loaded axial pusher and a lever, which together form a mechanism for turning over the frame with knife clamps installed on it, which allows sharpening both sides of the knife without removing it from the clamps. In addition, sharpening accuracy is ensured by the possibility of vertical movement and fixation of the hinge assembly, which allows precise adjustment of the required angle of inclination of the abrasive to the plane of the knife.

[0010] The invention is explained by drawings, where Fig. 1 shows the external view of the device in isometric projection; Fig. 2 shows the assembly diagram of the device; Fig. 3 shows the external view of the hinge assembly in isometric projection; Fig. 4 shows the external view of the coupling with a tongue for parking the abrasive holder; Fig. 5, 6, 7, 8, 9 show the assembly diagrams of the device.

[0011] The knife sharpening device has the following design. The basis of the device is a base 1, fixed on a stand 2 (Fig. 1), on which a rotary carriage 3 is fixed with a frame 4, on which knife clamps 5 and 6 are mounted, made with the possibility of rotation around a horizontal axis and rigid fixation in a horizontal position, a hinge unit 7 for installing in it with the possibility of rotation of the guide 8 of the abrasive holder (not shown in the figures). The rotary carriage 3 (Fig. 2) consists of a body 9 with a central opening 10 and plates 11 fixed to its outer side surfaces, each of which contains openings, the first 12 of which is made with the possibility of its alignment with an axis 13 installed horizontally in the base 1, and the second 14 is made with the possibility of installing in it a screw 15, fixing the carriage 3 on the base 1.An axial pusher 16 is installed inside the central opening 10 of the body 9, spring-loaded by a spring 17, on the end of which a screw 18 is fixed in the opening, the rod of which is aligned with the central opening 19 of the frame 4, and the head 20 of the screw 18 is located on the side of the knife clamps 5 and 6, pressing the frame 4 to the end of the pusher 16 through the washer. Additionally, in the base 1, fixed on the support 2, a lever 21 is installed on the axis, combined with the pusher 16 to ensure the possibility of longitudinal movement of the pusher 16.

[0012] The hinge unit 7 (Fig. 3) is made in the form of a housing 22, inside which a spherical roller bearing 23 is fixed, and in the lower part of the housing a through closed groove 24 is made, wherein the housing is fixed on a pin 25 installed in a vertical opening 26 of the base 1 with the possibility of fixing it using a screw 27. The guide 8 of the abrasive holder (Fig. 1) is a rod equipped with a handle 28, at one end of which a first movable stop 30 and a second fixed stop 31 are installed, spring-loaded by a spring 29, used to fix the abrasive, and at the second end of the rod a limiter 32 of the rod stroke is fixed. Additionally, in the center of the rod, a coupling 33 is installed with a tongue 34 (Fig. 4), made with the possibility of its alignment with a through closed groove 24 of the housing 22 of the hinge unit 4, to ensure the possibility of blocking the longitudinal movements of the rod (its parking), for example, during transportation of the device or when preparing it for operation.

[0013] The knife sharpening device is used as follows.

[0014] Initially, the device is assembled. To do this, the rotary carriage 3, installed with the help of holes 12 on the axis 13 of the base 1, is turned clockwise and the carriage is fixed with the help of screws 15, installed in the holes 14 of each of the plates 11 diametrically opposite to the longitudinal axis of the central hole 10 of the body 9 (Fig. 5, Fig. 6); then the base 1 is installed on the support 2 and secured with screws 35 (Fig. 7). Next, the frame 4 is installed on the axial pusher 16 and pressed against the end of the pusher, screwing the screw 18 through the washer 36 and the central hole 19 into the hole of the pusher 16. To secure the screws 15, 18 and 35, use a 3 mm Allen key.

[0015] At the last stage, holding the guide 8 of the holder with the handle 28, the movable stop 30 is moved away and an abrasive block is installed between it and the fixed stop 31, after which, releasing the movable stop 31, it is fixed in the holder using the spring 29. The pin 25 of the hinge assembly is installed in the vertical hole 26 of the base 1 and the height of the position of the spherical roller bearing 23 and, accordingly, the sharpening angle of the knife are adjusted, focusing on the ruler 36 (Fig. 9) applied to the surface of the pin 25, after which its position is fixed using the screw 27.

[0016] When sharpening a knife begins, knife clamps 5 and 6 are installed on frame 4, secured to it with screws 37 installed in frame grooves 38 and screwed into holes made on the ends of the clamps (not shown in the figures), while the clamps are secured with the possibility of their sliding along frame 4. Next, moving clamps 5 and 6 along the frame, adjust the distance between them, ensuring reliable fastening of the knife being sharpened, after which the position of the clamps is rigidly fixed with screws 37. After which the knife being sharpened is installed in knife clamps 5 and 6 with the tip toward the sharpener and fixed in the clamps with screws 38, and then sharpening of the knife blade begins.

[0017] Having finished processing one side of the blade, the frame 4 is turned over by 180°. To do this, using the tongue of the lever 21, it is rotated in such a way that the lever, pressing on the pusher 16, shifts it and the screw 18 in the axial direction, thus releasing the frame 4. After this, the frame is manually rotated by 180°, and then the lever 21 is returned to its original position, again fixing the frame 4 in a horizontal position. During this operation, in order to increase the safety of the work, it is advisable to fix (park) the abrasive holder 8 by aligning the tongue 34 of the coupling 33 with the through closed groove 24 of the housing 22 of the hinge unit 4. After turning the frame 4, the abrasive holder is released and sharpening of the knife continues with its help.

[0018] When adjusting the sharpening angle, an electronic inclinometer can be used together with the device, equipped with a control unit with a multi-sensor motion measurement sensor, an indication module and a data input unit connected to it, while the inclinometer control unit is made on the basis of a microprocessor system, the central element of which is a microcontroller. The inclinometer, developed for joint use with the knife sharpening device, which was named "Axicube One", provides increased accuracy of adjusting the sharpening angle of knife blades and can be installed on platform 39, fixed on the rotary carriage 3, which is a magnetic plate, or on platform 40 of the fixed stop 31.

[0019] Thus, the device considered in this application is an easy-to-use, high-tech and safe knife sharpening machine. Currently, a pilot batch of such devices has been manufactured, called "TSPROF Pioneer". Due to the design features of the device discussed above, the machine sharpens knives with a spine thickness of up to 5 mm, with a knife blade length of up to 250 mm, with a knife blade width of up to 40 mm, while the minimum sharpening angle is 12°, and the maximum is 26°. Bars with a length of 10 to 160 mm and a thickness of 3 to 15 mm can be used as abrasives.

Claims

8 Invention formula KNIFE SHARPENER 1. A device for sharpening knives, comprising a base fixed to a stand, on which a rotary carriage is fixed with a frame on which knife clamps are mounted, made with the possibility of rotation around a horizontal axis and rigid fixation in a horizontal position, and a hinged unit for installation in it with the possibility of rotation of the guide of the abrasive holder, characterized in that the rotary carriage consists of a housing with a central opening and plates fixed to its outer side surfaces, each of which contains openings, the first of which is made with the possibility of its alignment with an axis mounted horizontally in the base, and the second is made with the possibility of installing a screw in it, fixing the carriage on the base;inside the central opening of the housing, an axial pusher is installed, spring-loaded by a spring, at the end of which, in the opening, a screw is fixed, the rod of which is aligned with the central opening of the frame, and the head of the screw is located on the side of the knife clamps, pressing the frame to the end of the pusher; in addition, in the base, fixed on the stand, a lever is installed on the axis, combined with the pusher to ensure the possibility of longitudinal movement of the pusher.

2. The device according to paragraph 1, characterized in that the hinge assembly is made in the form of a housing, inside which a spherical roller bearing is secured, wherein the housing is secured on a pin installed in a vertical hole in the base with the possibility of fixing it with a screw. SUBSTITUTE SHEET (RULE 26) 9 3. The device according to claim 1, characterized in that the guide of the abrasive holder is a rod equipped with a handle, at one end of which a spring-loaded first movable stop and a second fixed stop are installed, used to fix the abrasive, and at the second end of the rod a rod travel limiter is fixed.

4. The device according to item 2, characterized in that a through closed groove is made in the lower part of the hinge assembly housing.

5. The device according to item 4, characterized in that a coupling with a tongue is installed in the center of the rod, designed with the possibility of its alignment with a through closed groove of the hinge assembly housing. SUBSTITUTE SHEET (RULE 26)

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