Structure of a rolling knife sharpener

Abstract

Structure of a rolling knife sharpener, comprising: a cylindrical wooden handlebar (1), both ends of which are symmetrically provided with cylindrical insertion slots (2); two bearings (5), each fixed in the insertion slots (2) by means of a mounting limiting mechanism; two aluminum wheels (7) arranged symmetrically at both ends of the handlebar (1) and each open in the center with a through mounting hole, wherein a MagSafe column (6) is fixedly arranged in the mounting hole, wherein the MagSafe column (6) and the wheel (7) together form a T-shaped structure, an end of the MagSafe column (6) facing away from the wheel (7) is pressed into the inner ring of the corresponding bearing (5) to ensure fastening; two limiting rings (9), each of which is fixedly arranged on the end surfaces of the two wheels (7) facing away from the handlebar (1); two grinding wheels (11) made of iron, each embedded in one of the limiting rings (9) and each of whose two ends in the diameter direction is provided with an arcuate stop (12), and the limiting ring (9) is open with notches (10) adapted to the arcuate stops (12); wherein the MagSafe column (6) fixes the corresponding grinding wheel (11) by attraction, and the engagement of the arcuate stops (12) in the notches (10) limits the circumferential displacement of the grinding wheel (11).

Description

[0001] The present invention belongs to the technical field of knife grinding tools and particularly relates to a structure of a rolling knife grinder.

[0002] The sharpness of knives has a direct impact on cutting performance and safety in everyday life and in the kitchen. Regular knife sharpening is therefore a necessary measure to ensure their performance. Traditional knife sharpening methods usually rely on tools such as whetstones and manual knife sharpeners. However, using these tools requires manual control of the angle between the knife and the knife sharpening tool. This is difficult and strenuous. It is also difficult for a non-professional user to ensure consistent blade sharpening. This can lead to localized blade wear or insufficient sharpening precision, which in turn reduces the lifespan of the knife.

[0003] As a highly efficient manual knife sharpening tool, the rolling knife sharpener is widely used in both home and professional settings due to its advantages such as convenient operation, consistent grinding, and significantly improved blade sharpness. Rolling friction enables a grinding process with even force distribution, significantly lowering the operating threshold. Thus, even non-professional users can easily achieve ideal knife sharpening results. However, the current mainstream design generally adopts a high-precision mounting structure to ensure rolling stability, such as a through-hole in the handle center with a built-in connecting shaft. This connects the bearing and the impeller component in series to ensure coaxial rotation of the grinding wheel.

[0004] While such structures can achieve a certain degree of functionality, the strict tolerance requirements for the components (e.g., the precision fit of the connecting shaft and the through hole) lead to a sharp increase in machining difficulties, and the complex assembly process further increases manufacturing costs. The high selling price resulting from the high precision limits the product's popularity in the price-sensitive market. In typical cases, the precise positioning structure (such as threaded screw connections and the fitting joints of the positioning groove) improves stability but leads to "precision redundancy" due to the strict control of part size tolerance and assembly alignment. This makes it difficult to make high-quality knife sharpeners accessible to a wider range of users.

[0005] The object of the present invention is to provide a structure of a rolling knife sharpener that solves the problems of high manufacturing cost and low popularity of existing rolling knife sharpeners due to their high-precision assembly structure, to reduce the fixture cost by simplifying the assembly process and reducing the precision dependence, so that more users can enjoy an efficient knife sharpening experience at reasonable prices.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a structure of a rolling knife sharpener, comprising: a cylindrical wooden handle bar, both ends of which are symmetrically provided with cylindrical insertion slots; two bearings, each secured in the insertion slots by means of a mounting limiting mechanism; two aluminum wheels, arranged symmetrically at both ends of the handlebar, each with a centrally open mounting hole, with a MagSafe column fixedly arranged in the mounting hole, the MagSafe column and the wheel together forming a T-shaped structure, one end of the MagSafe column facing away from the wheel being pressed into the inner ring of the corresponding bearing to ensure fastening; two limit rings, each fixed to the end surfaces of the two wheels facing away from the handlebar; two iron grinding wheels, each embedded in one of the limit rings, each of whose two ends in the diameter direction is provided with an arcuate stop, and the limit ring is opened with notches adapted to the arcuate stops; The MagSafe column fixes the corresponding grinding wheel by attraction, and the engagement of the arcuate stops in the notches limits the circumferential displacement of the grinding wheel.

[0007] Preferably, the mounting limiting mechanism comprises an annular projection on the underside of the insertion slot, the annular projection pressing against the end surface of the outer ring of the bearing, and the bearing being fixed in the insertion slot by adhesive.

[0008] Preferably, the assembly limiting mechanism further comprises a metal bushing embedded in the insertion slot, the outer wall of which is provided with radial, convex teeth, the convex teeth being anchored in the wooden portion of the handle bar and thus forming a radial lock, and the inner wall of the metal bushing and the outer ring of the bearing being connected to each other by an interference fit.

[0009] Preferably, the grinding wheel comprises a matte surface and a smooth surface, wherein the matte surface is a coarse grinding surface and the smooth surface is a finely ground, polished surface.

[0010] Preferably, the end surface area of the impeller in contact with the grinding wheel is provided with a non-slip texture.

[0011] Preferably, an annular groove is opened on the annular outer wall of the impeller and a non-slip rubber ring is embedded in the annular groove.

[0012] Compared to the prior art, the present invention offers the following advantageous effects:

[0013] The symmetrical arrangement of cylindrical insertion slots at both ends of the handlebar and the use of multiple fixing methods—including annular bosses and metal bushings—to secure the bearings limit the radial and axial displacement of the bearings, ensuring a stable and reliable grinding process and reducing the labor and cost of machining. The impeller is fixed to the inner ring of the bearing via a MagSafe column, and through the engagement of the arcuate stopper and the notch on the end surface of the impeller, as well as the attraction of the MagSafe column, the grinding wheel is circumferentially limited and axially fixed, and it can be quickly disassembled and assembled without the need for complex positioning structures.In addition, the grinding wheels on both sides are positioned with the matte surface and the smooth surface facing outwards to conveniently switch between rough and fine grinding; the overall structure reduces the dependence on assembly precision while taking into account the aspects of cost control, ease of operation, and uniform grinding. Fig. 1 shows a three-dimensional representation of the present invention. Fig. Figure 2 shows a disassembled view of the present invention. Fig. Figure 3 shows a three-dimensional representation of a handle bar of the present invention. Fig. 4 shows a three-dimensional representation of an impeller in the present invention. Example 1:

[0014] With reference to Fig. 1 to 4, a structure of a rolling knife grinder is shown, which comprises: a cylindrical wooden handlebar 1, both ends of which are symmetrically provided with cylindrical insertion slots 2; two bearings 5, each fixed in the insertion slots 2 by means of a mounting limiting mechanism; two aluminum wheels 7, which are arranged symmetrically at both ends of the handlebar 1 and each have a centrally open mounting hole through which a MagSafe column 6 is fixedly arranged in the mounting hole, the MagSafe column 6 and the wheel 7 together forming a T-shaped structure, an end of the MagSafe column 6 facing away from the wheel 7 being pressed into the inner ring of the corresponding bearing 5 to ensure fastening; two limiting rings 9, which are each fixedly arranged on the end surfaces of the two wheels 7 facing away from the handlebar 1; two grinding wheels 11 made of iron, each embedded in a limiting ring 9 and each of whose two ends in the diameter direction are provided with an arcuate stop 12, the limiting ring 9 being opened with notches 10 adapted to the arcuate stops 12;

[0015] The MagSafe column 6 fixes the corresponding grinding wheel 11 by attraction, and the engagement of the arcuate stops 12 in the notches 10 limits the circumferential displacement of the grinding wheel 11.

[0016] As from Fig. As can be seen in Figure 4, an annular groove is opened on the annular outer wall of the impeller 7 and a non-slip rubber ring 8 is embedded in the annular groove.

[0017] From the above description, it is known that the assembly process of the rolling knife sharpener uses the cylindrical wooden handlebar 1 as the core, whose cylindrical insertion slots 2, symmetrically open at both ends, each stably fix the bearing 5 through an assembly limiting mechanism. The idler gear 7 is made of aluminum, making it lightweight and low inertia. The central through-hole mounting hole is combined with the MagSafe column 6 to form a T-shaped structure. The end of the MagSafe column 6 facing away from the idler gear 7 is tightly combined with the inner ring of the bearing 5 through a press-fitting process, and thus the axial limitation is achieved through an interference fit, so that the idler gears 7 are symmetrically suspended at both ends of the handlebar 1.The opposite end surfaces of the two idler wheels 7 each limit the mounting position of the grinding wheel 11 with a limit ring 9, while the circumferentially open notches 10 of the limit ring 9, together with the arcuate stops 12 at both ends of the diameter of the grinding wheel 11, form a precise engagement. Thanks to the magnetic attraction effect of the MagSafe column 6, the grinding wheel 11 is both axially fixed and protected from circumferential rotation. A non-slip rubber ring 8 is embedded in the annular groove on the outer wall of the idler wheel 7, which increases contact friction and ensures stability during holding and rolling. During use, the knife is first held in place with a professional fastening device, and the inclination angle of the knife surface is adjusted so that the sharpening degree of the knife surface can be determined. Then, the knife sharpener is placed crosswise so that the knife sharpener can roll.Subsequently, the outer wall of the grinding wheel 11 is pressed against the position of the knife surface and the knife blade, and the handle bar 1 is then held and rolled along the surface of the knife. Due to the low friction properties of the bearing 5, the roller wheel 7 drives the grinding wheel 11 to rotate at high speed. The grinding surface of the grinding wheel 11 is in contact with the blade to achieve uniform and efficient grinding through rolling friction.

[0018] With reference to Fig. 2 and in view of the above, the grinding wheel 11 particularly comprises a matte surface and a smooth surface. The matte surface is a coarse grinding surface, and the smooth surface is a finely ground, polished surface.

[0019] From the above description, it is known that the grinding wheel 11 comprises a matte surface and a smooth surface. The matte surface is a coarse grinding surface designed for rapid edge formation, removal of rust or curling, and other operations on the knife surface, while the smooth surface is a finely ground, polished surface designed for fine grinding of the knife surface to improve the sharpness and smoothness of the blade. The different functional characteristics of the two sides enable the complete grinding process from coarse grinding to fine grinding. During use, the grinding wheels 11 on either side of the knife sharpener can be positioned with the matte surface and the smooth surface facing outwards.During use, disassembly or rotation of a single grinding wheel 11 is not required, and only the entire knife sharpener needs to be rotated. This means that coarse grinding can be performed on the matte surface on one side, and then the smooth surface on the other side can be used directly for fine grinding. This allows for a convenient switching process of "coarse grinding on one side + fine grinding on the opposite side," simplifying the operating steps.

[0020] With reference to Fig. 2 and Fig. 4 and in view of the above, the end surface portion of the impeller 7 which is in contact with the grinding wheel 11 is particularly provided with a non-slip texture.

[0021] From the above description, it is known that the end surface portion of the idler wheel 7 in contact with the grinding wheel 11 is provided with a non-slip texture, which is directly distributed on the end surface of the idler wheel 7 toward the grinding wheel 11 to increase the roughness of the contact surface through the raised texture. When the grinding wheel 11 is attached to the end surface of the idler wheel 7 by attracting the MagSafe column 6, the non-slip texture adheres tightly to the back of the grinding wheel 11, thereby forming circumferential constraints due to frictional resistance. This ensures that while holding the handle bar 1 and rolling to sharpen a knife, the grinding wheel 11 can rotate synchronously with the idler wheel 7 without relative slippage, so that the frosted surface or smooth surface of the grinding wheel 11 always acts on the blade at a stable angle and speed.This effectively ensures the uniformity of the grinding track and the consistency of the grinding force and improves the stability and reliability of the knife grinding effect. Example 2:

[0022] As in Fig. 3, the mounting limiting mechanism comprises an annular projection 3 on the underside of the insertion slot 2, the annular projection 3 pressing against the end surface of the outer ring of the bearing 5, and the bearing 5 being fixed in the insertion slot 2 by adhesive.

[0023] From the above description, it is known that when the bearing 5 is pressed into the insertion slot 2, the annular projection 3 on the underside of the insertion slot 2 provides a receiving space for the adhesive process between the end surface of the outer ring of the bearing 5 and the underside of the insertion slot 2, and the adhesive fills in the area surrounded by the annular projection 3 and thereby fixes the outer ring of the bearing 5 in the insertion slot 2 by adhesive action, while the upper surface of the annular projection 3 is in contact with the end surface of the outer ring of the bearing 5 to help define the adhesive gap, thereby evenly distributing the adhesive.The dual effect of adhesive bonding and structural restraint effectively limits the axial displacement of the bearing 5, ensuring the stable installation of the bearing 5 and preventing axial movement of the MagSafe column 6, the impeller 7, and other components during the roll grinding process. This improves the structural reliability of the knife sharpener.

[0024] Preferably, the mounting limiting mechanism comprises, as in Fig. 2, furthermore a metal bushing 4 embedded in the insertion slot 2, the outer wall of which is provided with radial, convex teeth, wherein the convex teeth are anchored in the wooden section of the handle bar 1 and thus form a radial lock and the inner wall of the metal bushing 4 and the outer ring of the bearing 5 are connected to one another by an interference fit.

[0025] From the above description, it is known that the outer wall of the metal bushing 4 is provided with radial, convex teeth. When pressed into the wooden portion of the handlebar 1, the convex teeth anchor themselves in the wood, thus forming a mechanical lock, while the outer wall of the metal bushing 4 and the inner wall of the insertion slot 2 are further fastened together by coated adhesive to achieve radial double fixation of the metal bushing 4 and the handlebar 1; in addition to the interference fit, the connection strength between the inner wall of the metal bushing 4 and the outer ring of the bearing 5 is increased by the adhesive filling space, so that the outer ring of the bearing 5 adheres tightly to the metal bushing 4.The structure, through the multiple effects of embedding the convex teeth, adhesive bonding and interference fit, not only improves the structural rigidity of the insertion slot area 2 and prevents direct wear of the wood, but also effectively limits the radial displacement of the bearing 5 to ensure the stability of the bearing assembly. List of reference symbols 1 handlebar 2 insertion slot 3 ring-shaped approach 4 socket 5 camps 6 MagSafe column 7 Wheel 8 non-slip rubber ring 9 Limit ring 10 notch 11 Grinding wheel 12 curved stop

Claims

[1] Structure of a rolling knife sharpener, comprising: a cylindrical wooden handlebar (1), both ends of which are symmetrically provided with cylindrical insertion slots (2); two bearings (5), each fixed in the insertion slots (2) by means of a mounting limiting mechanism; two aluminum wheels (7) arranged symmetrically at both ends of the handlebar (1) and each open in the center with a through mounting hole, wherein a MagSafe column (6) is fixedly arranged in the mounting hole, wherein the MagSafe column (6) and the wheel (7) together form a T-shaped structure, an end of the MagSafe column (6) facing away from the wheel (7) is pressed into the inner ring of the corresponding bearing (5) to ensure fastening; two limiting rings (9), each of which is fixedly arranged on the end surfaces of the two wheels (7) facing away from the handlebar (1); two grinding wheels (11) made of iron, each embedded in one of the limiting rings (9) and each of whose two ends in the diameter direction is provided with an arcuate stop (12), and the limiting ring (9) is open with notches (10) adapted to the arcuate stops (12); wherein the MagSafe column (6) fixes the corresponding grinding wheel (11) by attraction, and the engagement of the arcuate stops (12) in the notches (10) limits the circumferential displacement of the grinding wheel (11). [2] Structure of a rolling knife grinder according to claim 1, characterized bythat the mounting limiting mechanism comprises an annular projection (3) on the underside of the insertion slot (2), the annular projection (3) pressing against the end face of the outer ring of the bearing (5), and the bearing (5) being fixed in the insertion slot (2) by adhesive. [3] Structure of a rolling knife grinder according to claim 1 or 2, characterized by in that the assembly limiting mechanism further comprises a metal bushing (4) embedded in the insertion slot (2), the outer wall of which is provided with radial, convex teeth, wherein the convex teeth are anchored in the wooden section of the handle bar (1) and thus form a radial lock and the inner wall of the metal bushing (4) and the outer ring of the bearing (5) are connected to one another by an interference fit. [4] Structure of a rolling knife grinder according to any one of the preceding claims, characterized bythat the grinding wheel (11) comprises a matted surface and a smooth surface, wherein the matted surface is a coarse grinding surface and the smooth surface is a finely ground, polished surface. [5] Structure of a rolling knife grinder according to any one of the preceding claims, characterized by that the end surface area of the impeller (7) which is in contact with the grinding wheel (11) is provided with a non-slip texture. [6] Structure of a rolling knife grinder according to any one of the preceding claims, characterized by that an annular groove is open on the annular outer wall of the impeller (7) and a non-slip rubber ring (8) is embedded in the annular groove.

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