KNIFE GRINDING ASSEMBLY AND KNIFE GRINDING APPARATUS

The present application discloses a knife grinding assembly, which includes a positioning portion, a slide rod, a pull rod, a slide block, a grinding stone and an universal connector; the positioning portion is fixedly connected to the slide rod, the slide block is slidably provided on the slide rod, the pull rod is provided on the slide block through the universal connector, the grinding stone is provided on the pull rod. The present application also discloses a knife grinding apparatus, which includes a base, a bracket, a clamper for clamping a knife and the knife grinding assembly, the clamper is provided on one side of the base, the bracket is detachably provided on the base and away from the clamper, and the positioning portion is detachably connected to the bracket.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. CN202321942045.1 filed on Jul. 21, 2023, the entire content of which is hereby incorporated by reference.

FIELD OF TECHNOLOGY

The present application relates to the technical field of knife grinding apparatus, and in particular to a knife grinding assembly and knife grinding apparatus.

BACKGROUND

Prior blade grinding is divided into flat grinding and convex grinding. Traditional Chinese knives generally have a convex ground blade, while modern knives mostly have a flat ground blade. A cross-section of the flat ground blade is generally V-shaped, which makes it relatively sharper. In contrast, the cross-section curve of the convex ground blade bulges outward, resembling a clam shell. Because of a slightly curved edge angle of the convex ground blade, during a cutting and chopping process, a contact surface between the convex ground blade and a material being cut is smaller than that of other blade types, which ensures a smaller resistance, a better edge retention and enhanced cutting performance and makes it more labor-saving.

The inventor discovered that the cutting performance of the convex ground blade depends on an edge angle, a fineness of an edge line of the blade and an evenness of a surface of the blade on both sides. When grinding the convex ground blade, the process begins by grinding the blade into a V-shaped flat ground blade with a grinding stone. Then, an angle of the grinding stone is adjusted continuously to refine a cross-sectional line of the blade, making it close to a curve, until the blade's sides hardly feel uneven edges to a touch. Therefore, controlling a shape of the cross-sectional curve in the convex grind is highly challenging during the grinding process. As a result, the convex grind is usually done by hand and requires a high level of skill from a craftsman. A procedure of the convex grind is complex, and it is difficult for inexperienced or less-experienced craftsman to produce a high-quality convex ground blade.

SUMMARY

According to an aspect of this disclosure, a knife grinding assembly is disclosed.

A knife grinding assembly includes a positioning portion, a slide rod, a pull rod, a slide block, a grinding stone and a universal connector; the positioning portion is fixedly connected to the slide rod, the slide block is slidably provided on the slide rod, the pull rod is provided on the slide block through the universal connector and is located below the slide block, and the grinding stone is provided on the pull rod.

According to another aspect of this disclosure, a knife grinding apparatus is disclosed, wherein the knife grinding apparatus includes a base, a bracket, a clamper for clamping a knife and the knife grinding assembly, the bracket is detachably provided above the base and disposed on one side of the base, the clamper is provided on another side of the base away from the bracket, and the positioning portion is detachably connected to the bracket.

DETAILED DESCRIPTION

Please refer toFIG.1. The present application discloses a knife grinding apparatus, which includes a base1, a bracket2, a knife grinding assembly3and a clamper4. The clamper4is provided on one side above the base1. The bracket2is detachably provided on another side above the base1away from the clamper4. The bracket2extends upwards. The knife grinding assembly3is provided on an upper end of the bracket2with a certain distance to the base1. A knife is disposed between the base1and the knife grinding assembly3, and clamped by the clamper4.

Wherein, the knife grinding assembly3includes a positioning portion31, a slide rod32, a slide block33, a pull rod34, a grinding stone35and a universal connector36. The slide rod32is fixedly connected to one side of the positioning portion31, an axis of the slide rod32is perpendicular to an extension direction of the bracket2. The slide block33is slidably provided on the slide rod32. The pull rod34is movably connected to the slide block33through the universal connector36and is located under the slide rod32. The grinding stone35is provided on the pull rod34. According to a position of a blade of the knife, the slide block33is moved to drive the pull rod34and the grinding stone35to move to different positions above the base1. Then a position and an angle between the grinding stone35and the blade is further adjusted by the universal connector36. In this embodiment, the universal connector36may be an universal joint in the prior art, which includes a pair of normal hinges with a relative orientation of 90° and ensures the slide block33and the pull rod34connected to both ends of the joint may turn in any direction relatively. In addition, the universal connector36may be a single-section universal joint or a bi-directional universal joint and so on in the prior art. The grinding stone35may be provided with several grinding surfaces with different grinding coefficient along a circumference of the pull rod34. With a rotation of the pull rod34around the slide block33, different grinding surface is chosen to grind the blade.

Please refer toFIG.2. The positioning portion31includes a connector311, a clamping bolt312and a fixing nut313. The connector311is sleeved on the bracket2through a through hole inside the connector311. An external thread is provided on the bracket2. The clamping bolt312is threadedly connected to the connector311. An axis of the clamping bolt312is perpendicular to the extension direction of the bracket2. The clamping bolt312is twisted to make an end of the clamping bolt312move towards or away from the bracket2. When the end of the clamping bolt312abuts on the bracket2, the connector311may be fixed and locked on the bracket2. In this embodiment, the clamping bolt312is disposed on one side of the connector311facing away from the slide rod32. The fixing nut313is sleeved on an outside of the bracket2and is threadedly connected to the bracket2. The fixing nut313is disposed under the connector311. A position of the connector311fixed on the bracket2may be adjusted by adjusting the fixing nut313to accommodate knives with different sizes. In use, first loosen the clamping bolt312to adjust the connector311to a desired height, then tighten the clamping bolt312to fix the connector311on the bracket2, that is, adjust the connector311to the desired height. With a cooperation of the clamping bolt313and the bracket2with an external thread, a connection between the positioning portion31and the bracket2is more firm, and it is more convenient to adjust a height of the positioning portion31on the bracket2, which is conductive to grind convex ground blade edges with different angles.

In this embodiment, the pull rod34is movably connected to a lower end of the slide block33through the universal connector36. The grinding stone35is sleeved on an outside of the pull rod34. The grinding stone35includes 4 grinding surfaces with different grinding coefficient, which are 500 meshes, 1000 meshes, 2000 meshes and 3000 meshes, respectively. Because the universal connector36ensures a universal motion of the pull rod34and a rotation of the pull rod34along its axis, in practical application, the pull rod34may be rotated according to grinding needs. That is, the user is allowed to select the grinding surface with an appropriate grinding coefficient, or to sequentially use grinding surfaces with progressively increasing grinding coefficient to obtain a finer blade. And the pull rod34may be moved left and right in a horizontal direction perpendicular to an up-and-down direction.

In this embodiment, a handle341is protrudingly provided on one side of the pull rod34away from the slide block33. The handle341is convenient for pulling the pull rod34to move. Furthermore, anti-slip stripes are provided on the handle341, which enhances friction between the user and the handle341, preventing slipping during use and facilitating force exertion, thereby improving grinding efficiency.

In this embodiment, one side of the slide rod32away from the connector311is provided with a slide block limiting post321protruding along a radial direction of the slide rod32. The slide block limiting post321is used to limit a range of a movement of the slide block33, and avoid a dropping of the slide block33when the slide block33slides along the slide rod32.

Please refer toFIG.3. A clamper connecting block11and a connecting bolt12are provided on the base1. A through hole is provided on a center of the clamper connecting block11, and a through hole is provided on the clamper4. The connecting bolt12passes through the through hole of the clamper connecting block11and the through hole of the clamper4to threadedly connected to the two and connect the clamper connecting block11and the clamper4together. An axis of the connecting bolt12is perpendicular to the extension direction of the bracket2and an axis of the slide rod32. The clamper4is fixed on the base1and may be rotated with a pitch angle along the axis of the connecting bolt12. With the adjusting of the pitch angle of the clamper4, the knife may be ground with different angles, users may grind the knife according to a specific condition of the knife to achieve a better grinding effect.

In this embodiment, the clamper4further includes a clamping bolt41, a first clamping block42and a second clamping block43. An axis of the clamping bolt41is perpendicular to the axis of the connecting bolt12. The first clamping block42and the second clamping block43is arranged back and forth along the axis of the clamping bolt41. The connecting bolt12passes through the second clamping block43and the first clamping block42in sequence. At least one of the first clamping block42and the second clamping block43is threadedly connected to the connecting bolt12, while the other one is either threadedly connected to, fixedly connected to or abuts on the connecting bolt12. Therefore, a clamping slot with an adjustable gap is formed between the first clamping block42and the second clamping block43. By rotating the clamping bolt41, a distance between the first clamping block42and the second clamping block43is adjusted and thus a size of the clamping slot is adjusted, and the knife is pressed and clamped, thereby achieving a clamping of different knives, and ensuring a suitable grinding for most knives. During use, first loosen the clamping bolt41to adjust the gap of the clamping slot to accommodate a knife. Insert a spine of the knife between the first clamping block42and the second clamping block43, and tighten the clamping bolt41to clamp the knife. Loosen the connecting bolt12to adjust the clamper4and the knife to a desired angle. Finally, tighten the connecting bolt12to lock an inclination angle of the clamper4.

In use, the knife grinding apparatus of the present application may fixe the knife on the base1through the clamper4, the angle of the knife may be adjusted and fixed through the clamper4. An extension direction of the blade of the knife may be set to be parallel to the axis of the connecting bolt12. Then the user holds the handle341on an end of the pull rod34to make the grinding stone35swing left and right along the axis direction of the connecting bolt12under an action of the universal connector36, and grind both sides of the blade to obtain a flat ground blade edge. Also, users may further hold the handle341on the end of the pull rod34to make the grinding stone35move back and forth along the slide rod32under an action of the slide block33, and swing up and down along the universal connector36. Thus, as the slide block33moves, the angle between the grinding stone35and the bracket2changes, allowing for a grinding of both sides of the blade to achieve an excellently convex ground blade edge.

Compared with the prior art, the knife grinding assembly cleverly integrates the grinding stone35and the pull rod34onto the slide block33through the universal connector36, and the slide rod32is connected to the connector311, thereby integrating the knife grinding assembly together, which greatly simplifies the knife grinding apparatus and reduces production costs. After the integration, the knife grinding assembly3may achieved knife grinding alone only with fixing the connector311and the knife. Installation of components such as the bracket2and the base1are not required. Further, the knife grinding assembly3may help inexperienced and less-experienced users to grind a high-quality convex ground blade. By improving the connecting bolt12, the clamper4of the knife grinding apparatus of the present application may adjust the pitch angle of the clamper4through adjusting the connecting bolt12alone, which is more convenient for use. Also, by providing the clamping bolt312and the fixing nut313on the positioning portion31, an adjustment of the height of the positioning portion31on the bracket2is more convenient.

The embodiments are for examples and detailed descriptions. The above-mentioned embodiments only express several implementation modes of the present application, and should not be understood as limiting the scope of the present application. It should be noted that, for those of skill in the art, several variations, modifications, substitutions, and variants may be made without departing from the concept of the present application.