A device for observing and positioning the grinding angle of a cutting edge

Abstract

This invention provides a device for observing and positioning the grinding angle of a cutting edge. The device includes a level for observing changes in the grinding angle and positioning the grinding angle, and a base for fixing the device to the blade. The level and the base are rotatably connected for adjusting the angle between them. This invention addresses two problems in the prior art: 1) How to ensure that the grinder maintains the correct grinding angle range and the correct cutting edge angle for the blade during the dynamic process of grinding; and 2) How to meet the requirements of controlling the grinding angle of various blade shapes (i.e., different blade widths and different cutting edge angles) during their respective grinding processes.

Description

Technical Field

[0001] This invention relates to the field of auxiliary tools for tool grinding, and in particular to a device for observing and positioning the grinding angle of a cutting edge. Background Technology

[0002] During the grinding process, the cutting edge of existing knives is prone to deviation in angle, resulting in a biased grinding angle, damage, or poor performance. Some existing knife grinding aids (such as angle gauges) can only provide limited static reference for the initial angle during grinding, and cannot provide real-time assistance in correcting the hand-held grinding angle of the knife during the grinding process, nor can they display in real time whether the knife angle has deviated during the grinding process.

[0003] Other existing tool grinding aids (such as U-shaped anglers that clamp the back of the blade) can fix the angle of a specific tool's cutting edge during grinding, but they are not applicable to tools with different blade widths, thus having a limited range of applications. Furthermore, during the grinding process, the part of the U-shaped angler located between the tool and the whetstone is prone to friction with the whetstone, which can damage both the U-shaped angler and the whetstone. Summary of the Invention

[0004] The purpose of this invention is to provide a device for observing and positioning the grinding angle of a cutting edge, mainly addressing the following problems in the prior art: 1. How to ensure that the grinder maintains the correct grinding angle range and conforms to the correct opening or grinding angle of the cutting edge during the dynamic process of grinding a cutting edge; 2. How to meet the needs of controlling the grinding angle of cutting edges for various blade shapes (i.e., different blade widths and different opening angles) during their respective grinding processes, and thus providing a device for observing and positioning the grinding angle of a cutting edge.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a device for observing and positioning the grinding angle of a blade, characterized in that: the device includes a horizontal bubble for observing the changes in the grinding angle of the blade and positioning the grinding angle of the blade, and a base for fixing the device to the blade body.

[0006] The level bubble and the base are rotatably connected for adjusting the angle between the level bubble and the base.

[0007] Furthermore, the horizontal bubble and the base are axially rotatably connected.

[0008] Furthermore, the device includes a first bracket and a second bracket for fixing the level bubble. The first end of the base is rotatably connected to the first end of the second bracket, and the second end of the base is rotatably connected to the second end of the first bracket. The first end of the first bracket is movably connected to the second bracket for adjusting the angle of the first bracket and the base.

[0009] Furthermore, the first end of the base is axially rotatably connected to the first end of the second bracket, and the second end of the base is axially rotatably connected to the second end of the first bracket.

[0010] Furthermore, the base includes a first connecting segment and a second connecting segment, and the second end of the first connecting segment is connected to the second end of the second connecting segment through a first connecting part to form a third concave part for accommodating the first bracket and the horizontal bubble.

[0011] Furthermore, the first bracket includes a third connecting segment and a fourth connecting segment, with the first end of the third connecting segment connected to the first end of the fourth connecting segment via a second connecting portion to form a first concave portion for placing a horizontal bubble.

[0012] Furthermore, the second bracket includes a fifth connecting segment and a sixth connecting segment, the second end of the fifth connecting segment being connected to the second end of the sixth connecting segment via a fourth connecting portion to form a second recessed portion for matching with the second connecting portion of the first bracket.

[0013] Furthermore, the second end of the third connecting segment is provided with a first auxiliary fixing part for fixing the bubble level;

[0014] And / or the second end of the fourth connecting segment is provided with a second auxiliary fixing part for fixing the level bubble;

[0015] A third auxiliary fixing part for fixing the bubble level is provided between the first end of the third connecting segment and the first end of the fourth connecting segment; and / or the third connecting segment and the fourth connecting segment are further provided with a fourth auxiliary fixing part for fixing the bubble level.

[0016] Furthermore, the second bracket is equipped with an angle value scale;

[0017] And / or the fifth connecting segment is provided with a plurality of teeth on one side of the second concave portion;

[0018] And / or the sixth connecting segment has several teeth on one side of the second concave portion;

[0019] And / or the second connecting part is provided with raised ribs on one or both sides, and the raised ribs match the teeth;

[0020] And / or the front side of the second connecting part is provided with an indicator for indicating the angle between the first bracket and the base.

[0021] Furthermore, a fifth step is provided on the rear side of the fifth connecting segment, and a sixth step is provided on the rear side of the sixth connecting segment;

[0022] The first end of the third connecting segment forms a third protrusion with one side of the second connecting portion, and the first end of the fourth connecting segment forms a fourth protrusion with the other side of the second connecting portion.

[0023] The third protrusion moves along the fifth step, and the fourth protrusion moves along the sixth step;

[0024] The indicator includes pointed indicator heads located at both ends of the indicator, each of the two pointed indicator heads corresponding to a protruding rib, and a horizontal indicator groove is provided between the two pointed indicator heads;

[0025] The two pointed indicator heads, together with the third and fourth protrusions, form two recesses, and the two raised ribs are located in the corresponding recesses.

[0026] Furthermore, the second end of the first connecting segment is provided with a first shaft hole, the second end of the second connecting segment is provided with a second shaft hole, the first end of the first connecting segment is provided with a third shaft hole, and the first end of the second connecting segment is provided with a fourth shaft hole.

[0027] The second end of the third connecting section is provided with a first shaft, and the second end of the fourth connecting section is provided with a second shaft. The first shaft matches the first shaft hole, and the second shaft matches the second shaft hole.

[0028] The outer side of the first end of the fifth connecting segment is provided with a third shaft, and the outer side of the first end of the sixth connecting segment is provided with a fourth shaft. The third shaft matches the third shaft hole, and the fourth shaft matches the fourth shaft hole.

[0029] The outer end of the third axis is provided with a third rectangular block, the outer end of the fourth axis is provided with a fourth rectangular block, the first end of the first connecting section is provided with a third rectangular hole, the third axis hole is located in the middle of the third rectangular hole, the first end of the second connecting section is provided with a fourth rectangular hole, the fourth axis hole is located in the middle of the fourth rectangular hole, the third rectangular block and the third rectangular hole are interlocked based on the third axis, and the fourth rectangular block and the fourth rectangular hole are interlocked based on the fourth axis.

[0030] Furthermore, the front side of the fifth connecting section is provided with an angle value scale for displaying the angle between the first bracket and the base, and the front side of the sixth connecting section is provided with a plurality of first protrusions, with a first groove formed between adjacent first protrusions, and the plurality of first grooves corresponding to different angle values ​​between the first bracket and the base.

[0031] The rear side of the first end of the fifth connecting segment and the rear side of the first end of the sixth connecting segment are connected by a third connecting part;

[0032] The fourth connecting part is provided with a second groove on one or both sides, and a second protrusion is provided on the inner side of the second end of the first connecting segment and / or the inner side of the second end of the second connecting segment. The second protrusion and the second groove match to realize a detachable connection between the fourth connecting part and the base.

[0033] Furthermore, the first connecting part has a first recess on the side facing the first bracket, and the fourth connecting part has a fourth recess on the side facing the base, with the first recess and the fourth recess corresponding to each other.

[0034] And / or the first connecting segment and the second connecting segment are arranged in parallel, and / or the third connecting segment and the fourth connecting segment are arranged in parallel, and / or the fifth connecting segment and the sixth connecting segment are arranged in parallel;

[0035] And / or the fifth step is arc-shaped, and the third protrusion moves in an arc along the fifth step;

[0036] And / or the sixth step is arc-shaped, and the fourth protrusion moves in an arc along the sixth step;

[0037] And / or the outermost side of the first connecting segment is provided with two first highest points, the straight line formed by the line connecting the two first highest points is parallel to the horizontal bubble, and the height of the outer end of the third rectangular block does not exceed the height of the first highest point;

[0038] And / or the outermost side of the second connecting segment is provided with two second highest points, the straight line formed by the line connecting the two second highest points is parallel to the horizontal bubble, and the height of the outer end of the fourth rectangular block does not exceed the height of the second highest point;

[0039] And / or the plane at the bottom of the base is parallel to the horizontal bubble;

[0040] And / or the second end of the first connecting segment and the second end of the second connecting segment are provided with an outwardly extending extension segment and the two extension segments intersect to form an extension portion. The extension portion forms a hanging hole with the first connecting portion. The outer surface of the extension portion is straight or planar. The outer surface of the extension portion is perpendicular to the horizontal bubble. The straight line formed by connecting the first end of the first connecting segment and the first end of the second connecting segment is parallel to the horizontal bubble.

[0041] Alternatively, the second bracket may be arc-shaped.

[0042] Furthermore, the base is provided with a magnet, or the base is provided with a clamp for fixing the base to the blade, or the base is provided with a suction cup for fixing the base to the blade, or the base is provided with an adhesive part for fixing the base to the blade; and / or the base is also provided with a hanging hole;

[0043] Alternatively, the length, height, and width of the device used to observe and position the blade grinding angle shall not exceed 8cm.

[0044] In view of the above technical features, the present invention has the following beneficial effects:

[0045] 1. The device for observing and positioning the blade grinding angle in this invention involves placing the base on the blade (blade surface or cutting edge), then placing the blade on the whetstone according to the correct grinding angle range, and adjusting the angle between the level bubble and the base to ensure the level bubble is horizontal. During the dynamic process of blade grinding, the grinder or operator only needs to observe the position of the level bubble (i.e., the change in the positional relationship between the level bubble and the indicator line) and correct the blade's tilt angle in real time to ensure the level bubble is horizontal. This ensures that the blade grinding angle remains within the correct grinding angle range and conforms to the correct opening or grinding angle of the blade (or, in other words, the level bubble continuously displays and assists in correcting the correct grinding angle of a specific blade's cutting edge), resulting in excellent grinding effect and more precise blade grinding.

[0046] 2. The device for observing and positioning the grinding angle of the blade in this invention can be applied to various knives (i.e., knives with different widths of blades, knives with curved blades, or knives with different cutting angles). As long as the base is aligned with the blade to be ground, the correct grinding angle of the blade can be continuously displayed in real time through the bubble level within a certain range during the grinding process, and the correct grinding angle of the blade can be corrected.

[0047] 3. The device for observing and positioning the blade grinding angle in this invention adjusts the angle of the first included angle between the first bracket and the base through the base, the first bracket, and the second bracket (the angle value of the first included angle can be reflected by the angle value scale on the second bracket). Then, the base is placed on the blade surface, and the blade is rotated synchronously with the base until the level bubble on the first bracket measures that the first bracket is in a horizontal state (the level bubble is located in the middle of the tube). At this time, the grinding angle between the blade and the horizontally placed whetstone is equal to the angle of the first included angle. During the blade grinding process, the operator can observe the position of the level bubble to correct the blade grinding angle at any time, so that the blade grinding angle is kept at the correct angle, that is, to maintain a specific blade grinding angle for grinding, and to avoid the grinding angle from deviating.

[0048] 4. The device for observing and positioning the grinding angle of a cutting edge in this invention only requires placing or fixing the base on the blade surface (on a different blade surface than the blade to be ground). There are no interfering objects between the blade and the whetstone, and the whetstone will not be damaged. Even if there is a small flat area on the blade surface, the device for observing and positioning the grinding angle of the cutting edge in this invention can effectively maintain the grinding angle of the blade. In other words, changes in the width of the blade surface do not affect the function of the device for observing and positioning the grinding angle of the cutting edge in maintaining a constant grinding angle. The device for observing and positioning the grinding angle of the cutting edge is applicable to blades of any blade surface width, thus having a wider range of applications. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of a device for observing and positioning the grinding angle of a cutting edge in Embodiment 1 (open state, left view angle).

[0050] Figure 2 This is a schematic diagram of the structure of a device for observing and positioning the grinding angle of a cutting edge in Embodiment 1 (open state, perspective view).

[0051] Figure 3 This is a schematic diagram (folded state, perspective view) of a device for observing and positioning the blade grinding angle in Embodiment 1.

[0052] Figure 4 This is a schematic diagram of the tool structure in Example 1.

[0053] Figure 5 This is a three-dimensional representation of a device for observing and positioning the grinding angle of a cutting edge, as described in Embodiment 2. Figure 1 (Open)

[0054] Figure 6 This is a three-dimensional representation of a device for observing and positioning the grinding angle of a cutting edge, as described in Embodiment 2. Figure 2 (Open)

[0055] Figure 7 This is a right view (open state) of a device for observing and positioning the blade grinding angle in Embodiment 2.

[0056] Figure 8 This is a three-dimensional representation of a device for observing and positioning the grinding angle of a cutting edge, as described in Embodiment 2. Figure 3 (Folded state)

[0057] Figure 9 This is a schematic diagram of the base structure in Example 2.

[0058] Figure 10 This is a schematic diagram of the structure of the first support in Embodiment 2.

[0059] Figure 11 This is a schematic diagram of the structure of the horizontal bubble in Example 2.

[0060] Figure 12 This is a schematic diagram of the structure of the second support in Embodiment 2.

[0061] Figure 13 This is a three-dimensional representation of a device for observing and positioning the grinding angle of a cutting edge, as described in Embodiment 2. Figure 4 (Open)

[0062] Figure 14 This is a bottom view (folded state) of a device for observing and positioning the blade grinding angle in Embodiment 2.

[0063] Figure 15 This is a usage diagram of a device used to observe and position the blade grinding angle in Example 2.

[0064] Figure 16 This is a bottom view (folded state) of a device for observing and positioning the blade grinding angle in Embodiment 3.

[0065] Figure 17 This is a left view (folded state) of a device for observing and positioning the blade grinding angle in Embodiment 3.

[0066] In the diagram: 1, 1000, base; 1001, first included angle; 1002, second included angle; 1003, magnet; 1004, third concave part;

[0067] 1100, First connecting segment; 1101, First end of the first connecting segment; 1102, Second end of the first connecting segment; 1103, First shaft hole; 1104, Third shaft hole; 1105, Third rectangular hole; 1106, First highest point;

[0068] 1200, Second connecting segment; 1201, First end of the second connecting segment; 1202, Second end of the second connecting segment; 1203, Second shaft hole; 1204, Fourth shaft hole; 1205, Fourth rectangular hole; 1206, Second highest point;

[0069] 1300, First connecting part; 1301, First recessed area;

[0070] 1400, Extension; 1401, Hanging hole;

[0071] 1500, Second protrusion;

[0072] 2000. The first bracket; 2001. The first inner recess;

[0073] 2100, Third connecting section;

[0074] 2101. First end of the third connecting segment; 2102. Second end of the third connecting segment; 2103. First shaft; 2104. First auxiliary fixing part; 2105. Third protrusion;

[0075] 2200, Fourth connecting section;

[0076] 2201, First end of the fourth connecting segment; 2202, Second end of the fourth connecting segment; 2203, Second shaft; 2204, Second auxiliary fixing part; 2205, Fourth protrusion;

[0077] 2300, Second connecting part; 2301, Protruding rib;

[0078] 2400, Third auxiliary fixing part;

[0079] 2500, Fourth auxiliary fixing part;

[0080] 2600, Indicator section; 2601, Sharp-angled indicator head; 2602, Indicator groove;

[0081] 2700, concave area;

[0082] 3000, horizontal bubble;

[0083] 3100. Pipe body; 3101. Indicator line; 3102. Spirit bubble;

[0084] 4000, Second bracket; 4001, Second recess; 4002, Tooth;

[0085] 4100, Fifth connecting segment; 4101, First end of the fifth connecting segment; 4102, Second end of the fifth connecting segment; 4103, Third axis; 4104, Third rectangular block; 4105, Fifth step;

[0086] 4200, Sixth connecting segment; 4201, First end of the sixth connecting segment; 4202, Second end of the sixth connecting segment; 4203, Fourth shaft; 4204, Fourth rectangular block; 4205, Sixth step;

[0087] 4300, Angle value scale; 4301, Angle scale value; 4302, First protrusion; 4303, First groove;

[0088] 4400, Third connecting part;

[0089] 4500, Fourth connecting part; 4501, Second groove; 4502, Fourth recessed area;

[0090] 5000, Knife; 5001, Blade; 5002, Blade Face; 5003, Angle required for blade grinding; 5004, Blade Line; 5005, Blade Face; 5006, Edge Line; 5007, Edge Face; 5008, Blade Edge; 5009, Back Edge; 5010, Blade Belly; 5011, Blade Tip; 5012, Blade Back;

[0091] 6000, whetstone. Detailed Implementation

[0092] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0093] See Figures 1 to 4 Specific embodiment 1: This embodiment 1 provides a device for observing and positioning the grinding angle of a blade. The device is characterized by including a horizontal bubble 3000 for observing the change in the grinding angle of the blade and positioning the grinding angle of the blade, and a base 1000 for fixing the device to the blade body.

[0094] The horizontal bubble 3000 and the base 1000 are rotatably connected. For example, the horizontal bubble 3000 and the base 1000 can be connected by a shaft, allowing them to rotate relative to each other to adjust the angle between them. The horizontal bubble 3000 and the base 1000 can be directly connected (e.g., the horizontal bubble 3000 has a shaft that matches a shaft hole on the base 1000), or they can be indirectly connected (e.g., the horizontal bubble 3000 and the base 1000 are rotatably connected via a first bracket 2000, see [reference]). Figures 1 to 3Alternatively, the tightness of the shaft connection between the level bubble 3000 and the base 1000 can be adjusted. This tightness is determined by the friction between the mounting shaft and the bushing between the level bubble 3000 and the base 1000. By increasing the friction between the mounting shaft and the bushing between the level bubble 3000 and the base 1000, the goal is to allow the level bubble 3000 and the base 1000 to rotate and adjust their angle while maintaining a constant angle. That is, when the operator rotates the level bubble 3000 and the base 1000 to adjust their relative position, the angle between the level bubble 3000 and the base 1000 can be changed. When the operator releases the level bubble 3000 and the base 1000, the angle adjusted by the friction remains unchanged. This avoids changes in the angle between the level bubble 3000 and the base 1000 during blade sharpening, which would affect the accuracy of the blade sharpening angle. It also eliminates the need for manual adjustment or the use of other tools to fix the angle between the level bubble 3000 and the base 1000.

[0095] The blade includes the blade face 5002 and the cutting edge face 5005, or more specifically, the parts on the blade 5000 that can be used to place, fix, or connect the base 1000, so as to achieve the purpose of adjusting the blade sharpening angle by utilizing the angle between the base 1000 and the level bubble 3000. The blade sharpening angle refers to the angle between the center line of the blade and the whetstone when sharpening the edge face 5007 or the cutting edge face 5005.

[0096] The blade consists of a cutting edge 5007 and a sharpening edge 5005. For example, in the first scenario, when the blade's sharpening angle is based on the 0-degree reference point of the blade's centerline when it's vertical, the angle between the parallel centerlines of the cutting edge and the blade is the angle required for sharpening. The base 1000 is parallel to the blade's centerline (for example, most blade surfaces are parallel to this centerline). Fix the base 1000 to the blade's sharpening edge 5002, place the cutting edge 5007 or sharpening edge 5005 close to the whetstone, and then adjust the level 3000. Adjust to a horizontal position (rotate between level bubble 3000 and base 1000). At this point, the angle between level bubble 3000 and base 1000 is equal to the blade sharpening angle. As long as level bubble 3000 is horizontal, the blade can be sharpened at the correct angle. In other words, the operator can adjust the blade sharpening angle between the blade and the whetstone by observing whether level bubble 3000 is horizontal (by checking whether level bubble 3102 is between the two indicator lines 3101). This helps level bubble 3000 to be horizontal and also enables the operator to position the blade sharpening angle.

[0097] For example, in the second scenario, the blade face 5002 is not a plane parallel to the center line of the blade. When the base 1000 is fixed to the blade face 5002, or when the base 1000 is fixed to the cutting edge 5005, the parallelism between the base 1000 and the center line of the blade is not parallel. Fix the base 1000 to the blade face 5002, and align the edge 5007 or cutting edge 5005 parallel to the grinding surface of the whetstone 6000. Then adjust the level bubble 3000 to a horizontal state (rotate between the level bubble 3000 and the base 1000). At this time, although the angle between the level bubble 3000 and the base 1000 is less than the blade grinding angle, the angle value between the level bubble 3000 and the base 1000 is the angle supplement value required for grinding the edge 5007. As long as the level bubble 3000 is in a horizontal state, it can ensure that the knife maintains the blade grinding angle and ensures that the blade has a good grinding effect.

[0098] The horizontal bubble 3000 and the base 1000 are rotatably connected, either by the end of the horizontal bubble 3000 being rotatably connected to the base 1000, or by the end of the horizontal bubble 3000 being rotatably connected to the end of the base 1000, or by the end of the horizontal bubble 3000 being rotatably connected to the end of the base 1000.

[0099] For example, in the third scenario, when the blade is curved (i.e., the cutting edge 5007 or blade face 5005 corresponding to the belly of the blade 5010), or when a back edge 5009 needs to be ground (if the back edge is not sharpened, this corresponds to a false edge or blade back), for example, referring to... Figure 4 With its unique tool structure, the operator can adjust the position of the base 1000 on the blade so that the base 1000 corresponds to the blade edge of the part to be sharpened. For example, the blade edge of the part to be sharpened can be aligned with the first end of the base 1000 (for example, the first end 1101 of the first connecting segment and the first end 1201 of the second connecting segment correspond to the blade edge of the part to be sharpened). The principle and effect are basically the same as the first and / or second cases mentioned above, and will not be repeated here. It can also help to achieve the correct angle for sharpening blade edges with different curvatures, further expanding the applicability of this device.

[0100] See Figures 5 to 15Specific embodiment 2: This embodiment 2 provides a device for observing and positioning the sharpening angle of a blade. This device includes a base 1000, a first bracket 2000 for fixing a spirit level 3000, and a second bracket 4000. The first end of the base 1000 is rotatably connected to the first end of the second bracket 4000 (e.g., axially rotatable). That is, when the base 1000 is stationary, the second bracket 4000 can rotate or flip around the connection point between the first ends of the base 1000 and the second bracket 4000 as a fulcrum to adjust the second included angle 1002 between the base 1000 and the second bracket 4000. The base 1000... The second end of the first bracket 2000 is rotatably connected to the second end of the first bracket 2000 (for example, axially rotatably connected). That is, when the base 1000 is stationary, the first bracket 2000 can rotate or flip with the connection point between the second end of the base 1000 and the second end of the first bracket 2000 as the fulcrum, adjusting the angle 1001 between the base 1000 and the first bracket 2000. The first end of the first bracket 2000 is movably connected to the second bracket 4000, used to adjust the angle between the first bracket 2000 and the base 1000 (for example, the angle 1001).

[0101] Preferably, the second bracket 4000 has a scale.

[0102] The level bubble 3000 is used to observe the changes in the blade grinding angle and to position the blade grinding angle. The base 1000 is used to fix the device to the blade body, such as placing or connecting the device to the blade body (such as the blade face or cutting edge of the knife).

[0103] At this time, the base 1000, the first support 2000 and the second support 4000 form a triangle (preferably an acute triangle for a stable structure) or the base 1000, the first support 2000 and the second support 4000 form a fan shape (for example, the second support 4000 is an arc shape). The first end of the first support 2000 is movably connected to the second support 4000, that is, the first end of the first support 2000 can be connected to any point on the second support 4000, or the first end of the first support 2000 can slide along the second support 4000 while maintaining the connection with the second support 4000 during the sliding process.

[0104] Preferably, in this embodiment 2, the base 1000 is provided with a magnet 1003. The magnet 1003 can be attached to the bottom of the base 1000 or placed inside the base 1000. The magnet 1003 attracts the cutting tool, so that the base 1000 is fixed on the cutting tool surface, which helps to fix a device for observing and positioning the cutting edge grinding angle on the cutting tool surface or at a designated position on the cutting tool surface. For example, if an injection molding process is used, the magnet 1003 is added inside the base 1000 during the production process. For example, the magnet 1003 is built into the base 1000, so that the bottom of the base 1000 is more stable, not easy to fall off, and can also effectively prevent the magnet 1003 from rusting.

[0105] As an alternative, the base 1000 is provided with a clamp for fixing the base 1000 to the blade surface. For example, the end or bottom of the base 1000 is provided with a U-shaped clamp, and the blade back 5012 is embedded in the U-shaped clamp. The U-shaped clamp clamps the blade surfaces on both sides of the blade, thereby fixing the base 1000 to the blade surface. This helps to fix a device for observing and positioning the blade grinding angle on the blade surface or at a designated position on the blade surface. Alternatively, the base 1000 is provided with a suction cup, which is attached to the blade surface to fix the base 1000 and the blade 5000. Or, the base 1000 (preferably the bottom of the base 1000) is provided with an adhesive part, which is used to fix the base 1000 and the blade 5000.

[0106] As an alternative, even without magnet 1003 or clamps, the user can press the base 1000 onto the blade surface to fix the base 1000 onto the blade surface, thus helping to fix a device for observing and positioning the blade sharpening angle onto the blade surface or a designated position on the blade surface.

[0107] The level bubble 3000 fixed on the first support 2000 includes a tube 3100 with two indicator lines 3101 dividing the tube 3100 into three equal parts. The tube 3100 is equipped with a floating level bubble 3102, which is a bubble moving inside the tube 3100. By observing the positional relationship between the bubble and the indicator lines 3101, it is determined whether the plane of the object or other plane being measured by the level bubble 3000 is in a horizontal or vertical state or at a certain angle (e.g., corresponding to the angle range of 0-45° of this device). When the level bubble 3102 inside the tube 3100 is located within the equally divided space in the middle of the tube 3100, it indicates that the first support 2000 is in a horizontal state (for example, if the deviation angle between the first support 2000 and the actual horizontal line is within ±0.5°, it is considered that the first support 2000 is in a horizontal state, that is, the level bubble 3000 is considered to be in a horizontal state. Of course, the deviation angle range between the first support 2000 and the actual horizontal line can also be adjusted according to the actual situation. As long as the sharpener can keep the sharpening of the blade within the correct sharpening angle range when holding the tool to sharpen it, it is in line with the correct sharpening angle of the tool. Then, the deviation angle range between the first support 2000 and the actual horizontal line is also considered that the first support 2000 is in a horizontal state, that is, the level bubble 3000 is considered to be in a horizontal state). When the level bubble 3102 inside the tube 3100 is located within the equally divided space at both ends of the tube 3100, it indicates that the first support 2000 is deviating from a horizontal state.

[0108] Preferably, the base 1000 includes a first connecting segment 1100 and a second connecting segment 1200, which are arranged in parallel. Their corresponding ends are connected by a first connecting portion 1300. That is, the second end 1102 of the first connecting segment and the second end of the second connecting tube are connected by the first connecting portion 1300, forming a concave shape, namely a third concave portion 1004. When the first support 2000 and the horizontal bubble 3000 fixed thereto are folded (i.e., the first support 2000 is reversed towards the base 1000 and embedded in the base 1000), this third concave portion 1004 is used to house the first support 2000 and the horizontal bubble 3000 fixed thereto. The tube body 3100 of the horizontal bubble 3000 is parallel to the first support 2000, and their angles are consistent.

[0109] Preferably, the base 1000 is also provided with a hanging hole 1401, which can be used to thread a hanging rope or to hang a device for observing and positioning the grinding angle of a blade on a designated object (such as a keychain). This makes it easy to carry the device for observing and positioning the grinding angle of a blade, preventing it from being lost. The operator can use it anytime and anywhere, making it convenient to use.

[0110] At this point, the length, height, and width of the device used to observe and position the blade grinding angle do not exceed 8cm. The device is small in size, specifications, or volume, making it easy to carry and use at any time.

[0111] Preferably, the first bracket 2000 includes a third connecting segment 2100 and a fourth connecting segment 2200, the third connecting segment 2100 and the fourth connecting segment 2200 are arranged in parallel, and the first end 2101 of the third connecting segment is connected to the first end 2201 of the fourth connecting segment through a second connecting part 2300 to form a first concave part 2001 for placing a horizontal bubble 3000.

[0112] The second end 2102 of the third connecting section is provided with a first auxiliary fixing part 2104 for fixing the horizontal bubble 3000, such as a first step part for fixing one end of the horizontal bubble 3000 tube body 3100 (e.g., the second end of the horizontal bubble 3000 tube body 3100). The second end 2202 of the fourth connecting section is provided with a second auxiliary fixing part 2204 for fixing the horizontal bubble 3000, and a second step part for fixing one end of the horizontal bubble 3000 tube body 3100. The first step part and the second step part help to fix the end of the horizontal bubble 3000 tube body 3100 at the same end.

[0113] A third auxiliary fixing part 2400 for fixing the level bubble 3000 is provided between the first end 2101 of the third connecting section and the first end 2201 of the fourth connecting section. For example, it is used to fix a third stepped part at the other end of the level bubble 3000 tube 3100 (e.g., the first end of the level bubble 3000 tube 3100). The third stepped part is arc-shaped. The first stepped part, the second stepped part, and the third stepped part are located on the same side of the first support 2000 (e.g., above the first support 2000) to prevent the tube 3100 of the level bubble 3000 from accidentally coming off this side of the first support 2000 and to improve the stability of the first support 2000 in fixing the level bubble 3000.

[0114] The third connecting section 2100 and the fourth connecting section 2200 are also provided with a fourth auxiliary fixing part 2500 for fixing the horizontal bubble 3000. For example, the middle part of the third connecting section 2100 and the middle part of the fourth connecting section 2200 are each provided with a first protrusion protruding towards the horizontal bubble 3000. Both first protrusions are located on the other side of the first bracket 2000 (for example, below the first bracket 2000), and together they clamp and fix the tube body 3100 of the horizontal bubble 3000, preventing the tube body 3100 of the horizontal bubble 3000 from accidentally coming out from this side of the first bracket 2000, and improving the stability of the first bracket 2000 in fixing the horizontal bubble 3000. In addition, as long as the operator applies pressure to the body 3100 of the horizontal bubble 3000, when the pressure is large enough, the body 3100 of the horizontal bubble 3000 will slide from between the two first protrusions into the first concave portion 2001, thereby fixing the body 3100 of the horizontal bubble 3000 to the first bracket 2000, or the body 3100 of the horizontal bubble 3000 will slide out from between the two first protrusions into the first concave portion 2001, thereby detachably fixing the body 3100 of the horizontal bubble 3000 to the first bracket 2000.

[0115] Of course, the first auxiliary fixing part 2104, the second auxiliary fixing part 2204, the third auxiliary fixing part 2400, and the fourth auxiliary fixing part 2500 can also be partially applied, as long as they can securely fix the horizontal bubble 3000 (actually the horizontal bubble 3000 tube body 3100) inside the first recess 2001.

[0116] Preferably, the second bracket 4000 includes a fifth connecting segment 4100 and a sixth connecting segment 4200, which are arranged in parallel. The second end 4102 of the fifth connecting segment is connected to the second end 4202 of the sixth connecting segment through a fourth connecting part 4500 to form a second concave part 4001 for matching with the second connecting part 2300 of the first bracket 2000. That is, the second connecting part 2300 and the second concave part 4001 cooperate to realize the movable connection between the first end of the first bracket 2000 and the second bracket 4000. For example, the joint between the two is designed with a rack-and-tooth friction positioning structure.

[0117] The second bracket 4000 is provided with an angle value scale 4300. For example, the front side of the fifth connecting segment 4100 is provided with an angle value scale 4300 for displaying the angle between the first bracket 2000 and the base 1000. The front side of the sixth connecting segment 4200 is provided with a plurality of first protrusions 4302. A first groove 4303 is formed between adjacent first protrusions 4302. The plurality of first grooves 4303 correspond to different angle values ​​between the first bracket 2000 and the base 1000.

[0118] In this embodiment 2, the angle value scale 4300 ranges from 10° to 45°. Angle scale values ​​4301 that are multiples of 5 will be marked with numbers to facilitate the operator in identifying the approximate position corresponding to different angles. At the same time, several first grooves 4303 are evenly distributed and correspond to the angle values. The first grooves 4303 provide more accurate positioning for the angle value scale 4300.

[0119] The second bracket 4000 is provided with an arc-shaped step portion. For example, the fifth connecting section 4100 is provided with an arc-shaped fifth step portion 4105 on the rear side, and the sixth connecting section 4200 is provided with an arc-shaped sixth step portion 4205 on the rear side.

[0120] The first end 2101 of the third connecting segment forms a third protrusion 2105 on one side of the second connecting portion 2300, and the first end 2201 of the fourth connecting segment forms a fourth protrusion 2205 on the other side of the second connecting portion 2300; the third protrusion 2105 moves in an arc along the fifth step portion 4105, and the fourth protrusion 2205 moves in an arc along the sixth step portion 4205; that is, the first end of the first bracket 2000 moves in an arc along the second bracket 4000 to realize the angle adjustment between the first bracket 2000 and the base 1000.

[0121] Preferably, the fifth connecting segment 4100 is provided with a plurality of teeth 4002 on one side of the second concave portion 4001; and / or the sixth connecting segment 4200 is provided with a plurality of teeth 4002 on one side of the second concave portion 4001; that is, a single tooth 4002 is a protruding tooth, and a plurality of teeth 4002 correspond to one or both sides of the second concave portion 4001. For example, in this embodiment 2, 36 teeth 4002 are provided on each side of the second concave portion 4001, and the positions of the teeth 4002 on both sides are paired to form a set of teeth 4002, so that each set of teeth 4002 corresponds to a 1° angle change. This can also help the operator to position the indicator 2600 on the specific angle value scale 4300, thereby improving the accuracy of the angle adjustment between the first bracket 2000 and the base 1000. Of course, this is just an example. The specific number and / or the scale value range represented by the first groove 4303 can also be adjusted by adjusting the range value of the angle value scale 4300. The second connecting portion 2300 is provided with raised ribs 2301 on one or both sides. The raised ribs 2301 match the teeth 4002. In this embodiment 2, the second connecting portion 2300 is provided with one raised rib 2301 on each of its left and right sides. The two raised ribs 2301 match the teeth 4002 on both sides of the corresponding second concave portion 4001. When the angle between the first bracket 2000 and the base 1000 needs to be adjusted, the operator pushes the first end of the first bracket 2000 and the indicator 2600 to make an arc-shaped movement. The raised ribs 2301 can slide in several teeth 4002. When the first bracket 2000... When the first end and the indicator 2600 are moved to the scale position corresponding to the specified angle, the operator releases the first end of the first bracket 2000 and / or the indicator 2600. The protruding rib 2301 and the corresponding tooth 4002 form a locking state to help fix the angle of the first bracket 2000. When using a device for observing and positioning the blade grinding angle, the angle between the first bracket 2000 and the base 1000 will not change during tool grinding and / or normal vibration caused by the grinding action, thus avoiding indirect impact on the accuracy of tool grinding.

[0122] The second connecting part 2300 (preferably the front side of the second connecting part 2300, that is, the side of the second connecting part 2300 facing away from the horizontal bubble 3000, and the front end of the second connecting part 2300 when the first bracket 2000 is stored in the base 1000) is provided with an indicator part 2600 for indicating the angle between the first bracket 2000 and the base 1000.

[0123] The indicator 2600 includes two pointed indicator heads 2601 located at both ends of the indicator 2600. Each of the two pointed indicator heads 2601 corresponds to a raised rib 2301, ensuring that the angle value scale 4300 pointed to by the indicator 2600 matches the angle between the first bracket 2000 and the base 1000. A horizontal indicator groove 2602 is provided between the two pointed indicator heads 2601. The operator can align the pointed indicator head 2601 with the angle value scale 4300 (including the angle value scale 4300 mark and / or each first groove 4303), or align it with the angle value scale 4301 through the indicator groove 2602, or simultaneously align the pointed indicator head 2601 and the indicator groove 2602 with the angle value scale 4300. Ultimately, the indicator 2600 can be aligned with the angle value scale 4300, ensuring the accuracy of the included angle between the first bracket 2000 and the base 1000.

[0124] Two pointed indicator heads 2601, together with the third protrusion 2105 and the fourth protrusion 2205, form two recesses 2700 respectively. Two raised ribs 2301 are located in the corresponding recesses 2700. In addition, the two recesses 2700 also form a locking effect on the tooth 4002. That is to say, the second connecting part 2300 can move in an arc within the second inner recess 4001, but the second connecting part 2300 and the second support 4000 will not separate, ensuring the stability of the movable connection between the first support 2000 and the second support 4000 and the stability of the overall structure of the device for observing and positioning the blade grinding angle.

[0125] The rear side of the first end 4101 of the fifth connecting segment and the rear side of the first end 4201 of the sixth connecting segment are connected by the third connecting part 4400. The third connecting part 4400 will not interfere with the complete embedding of the indicator part 2600 between the first end 4101 of the fifth connecting segment and the first end 4201 of the sixth connecting segment. At the same time, it will also strengthen the stability of the structure of the second support 4000. At this time, the second support 4000 is quadrilateral. In addition, when the second support 4000 is flipped up, the third connecting part 4400 can be used to lift the first end of the first support 2000 to a certain height (for example, the indicator part 2600 is level with the starting scale at this time), which is convenient for the subsequent lifting of the first end of the first support 2000 and realize the adjustment of the angle between the first support 2000 and the base 1000.

[0126] The fourth connecting part 4500 is provided with a second groove 4501 on one or both sides, and a second protrusion 1500 is provided on the inner side of the second end 1102 of the first connecting rod connecting section and / or the inner side of the second end 1202 of the second connecting rod connecting section. The second protrusion 1500 and the second groove 4501 match each other to realize a detachable connection between the fourth connecting part 4500 and the base 1000.

[0127] Preferably, the second end 1102 of the first connecting rod connecting segment is provided with a first shaft hole 1103, and the second end 1202 of the second connecting rod connecting segment is provided with a second shaft hole 1203; the first end 1101 of the first connecting rod connecting segment is provided with a third shaft hole 1104, and the first end 1201 of the second connecting rod connecting segment is provided with a fourth shaft hole 1204; the second end 2102 of the third connecting rod connecting segment is provided with a first shaft 2103, and the second end 2202 of the fourth connecting rod connecting segment is provided with a second shaft 2203; the first shaft 2103 matches the first shaft hole 1103, that is, the first shaft 2103... The second shaft 2203 is embedded in the first shaft hole 1103, which helps to form a rotatable connection between the second end 2102 of the third connecting rod connecting segment and the second end 1102 of the first connecting rod connecting segment. The second shaft 2203 matches the second shaft hole 1203, that is, the second shaft 2203 is embedded in the second shaft hole 1203, which helps to form a rotatable connection between the second end 2202 of the fourth connecting rod connecting segment and the second end 1202 of the second connecting rod connecting segment. Thus, the first bracket 2000 and the base 1000 are rotatably connected as a whole, and the first bracket 2000 can be flipped relative to the base 1000.

[0128] Preferably, a third shaft 4103 is provided on the outer side of the first end 4101 of the fifth connecting segment, and a fourth shaft 4203 is provided on the outer side of the first end 4201 of the sixth connecting segment. The third shaft 4103 matches the third shaft hole 1104, that is, the third shaft 4103 is embedded in the third shaft hole 1104, which helps to form a rotatable connection between the first end 4101 of the fifth connecting segment and the first end 1101 of the first connecting segment; the fourth shaft 4203 matches the fourth shaft hole 1204, that is, the fourth shaft 4203 is embedded in the fourth shaft hole 1204, which helps to form a rotatable connection between the first end 4201 of the sixth connecting segment and the first end 1201 of the second connecting segment, thereby realizing the rotatable connection between the second bracket 4000 and the base 1000 as a whole, and realizing the flip-out movement of the second bracket 4000 relative to the base 1000.

[0129] Preferably, the outer end of the third shaft 4103 is provided with a third rectangular block 4104, the outer end of the fourth shaft 4203 is provided with a fourth rectangular block 4204, the first end 1101 of the first connecting segment is provided with a third rectangular hole 1105, the third shaft hole 1104 is located in the middle of the third rectangular hole 1105, the first end 1201 of the second connecting segment is provided with a fourth rectangular hole 1205, the fourth shaft hole 1204 is located in the middle of the fourth rectangular hole 1205, and the third rectangular block 4104 matches the third rectangular hole 1105, that is, the third rectangular block 4104 is embedded in the third rectangular hole 1105. Then, the installation between the first end 4101 of the fifth connecting segment and the first end 1101 of the first connecting segment is achieved. The fourth rectangular block 4204 matches the fourth rectangular hole 1205, that is, after the fourth rectangular block 4204 is embedded in the fourth rectangular hole 1205, the installation between the first end 4201 of the sixth connecting segment and the first end 1201 of the second connecting segment is achieved. When the second bracket 4000 is flipped relative to the base 1000, the third rectangular block 4104 and the third rectangular hole 1105 can achieve interlocking between the first end 4101 of the fifth connecting segment and the first end 1101 of the first connecting segment, and the fourth rectangular block 4204 and the fourth rectangular hole 1205 can achieve interlocking between the first end 4201 of the sixth connecting segment and the first end 1201 of the second connecting segment. This design can eliminate the metal fasteners used in the prior art, eliminate the need for punching, simplify assembly, and use injection molding process to form the second bracket 4000 and the base 1000. The product molding precision is high and the yield is high. The installation between the second bracket 4000 and the base 1000 is simple and quick, effectively reducing the processing and assembly costs of the second bracket 4000 and the base 1000. This structure provides the product (the device used to observe and position the blade grinding angle) with significantly better structural strength (eliminating the possibility of shaft and hole separation) and greater cost advantages (simpler production and assembly). In other words, the third rectangular block 4104 matches the third rectangular hole 1105, and the third shaft 4103 matches the third shaft hole 1104; the fourth rectangular block 4204 matches the fourth rectangular hole 1205, and the fourth shaft 4203 matches the fourth shaft hole 1204.

[0130] In this embodiment 2, the third rectangular block 4104 matches the third rectangular hole 1105 to achieve misalignment locking, and the fourth rectangular block 4204 matches the fourth rectangular hole 1205 to achieve misalignment locking. That is, the third rectangular block 4104 and the third rectangular hole 1105 are interlocked based on the third axis 4103, and the fourth rectangular block 4204 and the fourth rectangular hole 1205 are interlocked based on the fourth axis 4203. For example, the third rectangular block 4104 and the fourth rectangular block 4204 are both perpendicular to the second bracket 4000; the third rectangular hole 1105 and the fourth rectangular hole 1205 are both at an angle (for example, 45°) to the base 1000. When the third rectangular block 4104... The angles of the second bracket 4000 and the base 1000 are such that the angles correspond to the angles of the third rectangular hole 1105 (e.g., the angles or positions of the two coincide), and the angle of the fourth rectangular block 4204 corresponds to the angle of the fourth rectangular hole 1205 (e.g., the angles or positions of the two coincide). This ensures that during the installation operation between the second bracket 4000 and the base 1000, the angle between them is obtuse. When the base 1000, the first bracket 2000, and the second bracket 4000 are fully installed, no matter how the second bracket 4000 is rotated or flipped (at this point, the third shaft 4103 still rotates in conjunction with the third shaft hole 1104, and the fourth shaft 4203 rotates in conjunction with the fourth shaft hole 1204), the angle between the second bracket 4000 and the base 1000 will not form an obtuse angle. In other words, after the device for observing and positioning the grinding angle of the blade is installed, the angle of the third rectangular block 4104 and the angle of the third rectangular hole 1105 cannot correspond again (that is, the two cannot be separated or disconnected), and the angle of the fourth rectangular block 4204 and the angle of the fourth rectangular hole 1205 cannot correspond again (that is, the two cannot be separated or disconnected). Therefore, the third rectangular block 4104 and the third rectangular hole 1105 form a stable interlocking structure, and the fourth rectangular block 4204 and the fourth rectangular hole 1205 form a stable interlocking structure. This design can effectively prevent the second bracket 4000 and the base 1000 from accidentally falling off after installation, and improve the structural stability of the connection structure between the second bracket 4000 and the base 1000.

[0131] It should be noted that regardless of the angle between the third rectangular block 4104 and the fourth rectangular block 4204 and the second bracket 4000, or the angle between the third rectangular hole 1105 and the fourth rectangular hole 1205 and the base 1000, as long as they cooperate to achieve misalignment locking (or misalignment interlocking) between the third rectangular block 4104 and the third rectangular hole 1105, and between the fourth rectangular block 4204 and the fourth rectangular hole 1205, it falls within the scope of protection of this patent.

[0132] When the base 1000 does not have the hanging hole 1401, the first connecting part 1300 is straight or has a plane on its outer side. The first connecting part 1300 is perpendicular to the first connecting segment 1100 and the second connecting segment 1200 (or the plane on the outer side of the first connecting part 1300 is perpendicular to the first connecting segment 1100 and the second connecting segment 1200). That is to say, the first connecting part 1300 (or the plane on the outer side of the first connecting part 1300) is indirectly perpendicular to the level bubble 3000. This design allows the level bubble 3000 to measure whether an object is vertical or horizontal. For example, the first connecting part 1300 (or the plane on the outer side of the first connecting part 1300) is pressed against the surface of the object whose angle is to be measured, while keeping the level bubble 3000 tube body 3100. When placed horizontally, if the level bubble 3102 inside the tube 3100 is located within the equally divided space in the middle of the tube 3100, the surface of the object to be measured is in a vertical state. If the level bubble 3102 inside the tube 3100 is located outside the equally divided space in the middle of the tube 3100, the surface of the object to be measured deviates from a vertical state.

[0133] In this embodiment 2, the base 1000 is provided with a hanging hole 1401. The hanging hole 1401 is located on the outside of the first connecting part 1300. For example, the second end 1102 of the first connecting segment and the second end 1202 of the second connecting segment are both provided with outwardly extending extension segments, and the two extension segments intersect to form an extension 1400. The hanging hole 1401 is formed between the extension 1400 and the first connecting part 1300. At this time, the outer surface of the extension 1400 can also be straight or a plane is provided on the outer side of the extension 1400. The extension 1400 (or the plane on the outer side of the extension 1400) is perpendicular to the first connecting section 1100 and the second connecting section 1200. This design allows the level bubble 3000 to measure whether an object is in a vertical state. For example, the extension 1400 (or the plane on the outer side of the extension 1400) is pressed against the surface of the object to be measured, and the tube 3100 of the level bubble 3000 is placed in a horizontal direction. If the level bubble 3102 in the tube 3100 is located within the equally divided space in the middle of the tube 3100, then the surface of the object to be measured is in a vertical state. If the level bubble 3102 in the tube 3100 is located outside the equally divided space in the middle of the tube 3100, then the surface of the object to be measured is deviating from a vertical state. At this time, the extension 1400 also helps to improve the structural stability of the base 1000 (especially the base 1000 after the entire device for observing and positioning the blade grinding angle is installed).

[0134] Preferably, the first connecting part 1300 has a first recess 1301 on the side facing the first bracket 2000, and the fourth connecting part 4500 has a fourth recess 4502 on the side facing the base 1000. The first recess 1301 and the fourth recess 4502 are in corresponding positions. That is, when a device for observing and positioning the blade sharpening angle is in the storage state, the first bracket 2000 is embedded in the third recess 1004, and the second bracket 4000 is tightly attached to the base 1000 (i.e., the second groove 4501 and the second protrusion 1500 are locked together). At this time, the first recess 1301 and the fourth recess 4502 together form a hole or notch, which makes it easy for the operator to insert a fingernail or other tools, helping the second bracket 4000 and the base 1000 to separate quickly, that is, to complete the operation of quickly flipping up the second bracket 4000, thereby improving the efficiency of use.

[0135] In this embodiment 2, the installation steps of each component in a device for observing and positioning the blade grinding angle are as follows:

[0136] First, the first end of the second bracket 4000 is installed with the first end of the base 1000, that is, the third rectangular block 4104 and the third shaft 4103 are embedded in the third shaft 4103 and the third shaft hole 1104, and the fourth rectangular block 4204 and the fourth shaft 4203 are embedded in the fourth shaft 4203 and the fourth shaft hole 1204. At this time, the second bracket 4000 and the base 1000 can be flipped. At the same time, the base 1000, supported by the third connecting part 4400, also indirectly achieves a quadrilateral structure, which has better stability.

[0137] Next, the first end of the first bracket 2000 is obliquely embedded into the second concave portion 4001, the protruding rib 2301 corresponds to the tooth portion 4002, and the first bracket 2000 is rotated so that the two concave portions 2700 of the first bracket 2000 are engaged with the corresponding tooth portions 4002, and the concave portions 2700 and the tooth portions 4002 form a movable connection.

[0138] Next, the second end of the first bracket 2000 is installed with the second end of the base 1000, that is, the first shaft 2103 is inserted into the first shaft hole 1103 and the second shaft 2203 is inserted into the second shaft hole 1203. At this time, the first bracket 2000 and the base 1000 can be flipped. It should be noted that the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment are not connected, and there is an elastic gap between them. The size of this gap is slightly larger than the space required for shaft assembly (the elastic gap refers to the space that allows the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment to approach each other, so that the first shaft 2103 can be aligned with the first shaft hole 1103 and the second shaft 2203 can be aligned with the second shaft hole 1203. When the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment are released, the first shaft 2103 can be inserted into the first shaft hole 1103 and the second shaft 2203 can be inserted into the second shaft hole 1203. That is to say, the elastic space is larger than the first shaft hole 1103). (and the space required for assembly of the second shaft hole 1203), which makes it convenient for the operator to press the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment together, reducing the distance between them, making it easier to insert into the third recess 1004 of the base 1000. When the first shaft 2103 is aligned with the first shaft hole 1103 and the second shaft 2203 is aligned with the second shaft hole 1203, the operator releases the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment. After they rebound, they are respectively inserted into the corresponding first shaft hole 1103 and second shaft hole 1203. The installation between the first bracket 2000 and the base 1000 is more convenient, improving the efficiency of the assembly work. At this point, the first support 2000 cannot rotate again, and the locking state of the recess 2700 and the tooth 4002 of the first support 2000 cannot make contact. The first end of the first support 2000 can only slide or move in an arc along the tooth 4002 of the second support 4000. At this point, the overall stability of the device used to observe and position the blade grinding angle is better.

[0139] Finally, the horizontal bubble 3000 is inserted into the first recess 2001. At this time, the horizontal bubble 3000 also restricts the distance between the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment. That is, the second end 2102 of the third connecting segment and the second end 2202 of the fourth connecting segment cannot be elastically deformed to the middle to generate displacement. The first shaft 2103 cannot be separated from the first shaft hole 1103, and the second shaft 2203 cannot be separated from the second shaft hole 1203. Therefore, the connection between the second end of the first bracket 2000 and the second end of the base 1000 is more stable, improving the overall stability of a device for observing and positioning the blade grinding angle.

[0140] The order of the above installation steps cannot be changed, otherwise the installation cannot be completed. The structure of each component is mutually restraining and cooperating to realize the overall installation of a device for observing and positioning the grinding angle of the blade. It meets the overall stability requirements of a device for observing and positioning the grinding angle of the blade, and does not require additional auxiliary installation parts (such as bolts or hinges). The installation and operation of each component is simple and convenient, and the production cost is low.

[0141] In this embodiment 2, the device for observing and positioning the blade grinding angle has the following application scenarios:

[0142] 1. Angle-assisted manual sharpening: This refers to the manual sharpening or grinding of knives with a single-sided cutting angle of 10-45° or a double-sided cutting angle (such as a knife with a V-shaped blade) on a whetstone (or a whetstone board, sheet, sandpaper, ceramic grinding disc, or leather board, etc., which are tools for grinding flat surfaces).

[0143] First, attach the base 1000 to one side of the blade (such as the blade face or cutting edge). At this time, the blade edge 5001 to be ground (for example, the cutting edge 5007 between the edge 5008 and the cutting edge 5006, or the cutting edge 5005 between the cutting edge 5006 and the cutting edge 5004) is located on the other side of the blade 5000. At this time, the width of the blade face will not limit or affect the effect of maintaining the blade grinding angle using a device for observing and positioning the blade grinding angle. In other words, a device for observing and positioning the blade grinding angle is suitable for blades with various blade face widths, as long as the device can be placed on the blade face. This reflects the wide applicability and broad application range of a device for observing and positioning the blade grinding angle.

[0144] Next, the second bracket 4000 is flipped upwards so that the first bracket 2000 and the level bubble 3000 are flipped up simultaneously. The pointed indicator head 2601 and / or indicator groove 2602 of the indicator part 2600 are positioned on the specified angle value scale 4300 (that is, the angle 5003 required for the grinding of the blade of the tool 5000). At this time, the included angle formed by the first bracket 2000 and the base 1000 matches the specified angle value scale 4300.

[0145] Next, place the other side of the blade on the whetstone 6000 (plate) and observe the position of the level bubble 3102 in order to adjust the blade angle (i.e., the angle between the blade and the whetstone). When the level bubble 3102 is centered (i.e., the level bubble 3102 is located in the equally divided space in the middle of the tube body 3100), the blade is at the correct grinding angle.

[0146] Finally, keeping the level bubble 3102 centered, begin sharpening the tool. The tool can be stopped at any position on the sharpening stone (slab) as needed. The sharpening angle can be adjusted by observing the position of the level bubble 3102. Alternatively, the position of the level bubble 3102 can be observed continuously during the sharpening process to facilitate timely adjustments to the sharpening angle, ensuring the tool maintains the correct sharpening angle for better edge sharpening results. During the sharpening process, the level bubble will also be in constant motion. As long as the level bubble remains within the two indicator lines, it is considered to be in a horizontal state. At this point, the tool's sharpening angle is within a reasonable range and meets the required sharpening angle.

[0147] During this process, the relative position between the device for observing and positioning the blade grinding angle and the blade remains unchanged, and the blade grinding angle can be displayed through the angle value scale 4300 and the indicator 2600; in addition, the device for observing and positioning the blade grinding angle will not come into contact with the whetstone (plate), thus avoiding mutual wear between the device for observing and positioning the blade grinding angle and the whetstone (plate).

[0148] II. Angle Assistance for Belt Sharpening: This method utilizes a belt sharpening machine to manually sharpen knives with an edge angle between 10-45°. The usage and working principle of a device for observing and positioning the sharpening angle are basically the same as in point I above. The difference is that the sharpening stone (plate) is replaced with the belt of the belt sharpening machine. Using the belt to sharpen the blade results in a faster sharpening speed. At this time, the knife and the device for observing and positioning the sharpening angle remain stationary, while the belt rotates to sharpen the blade. The operator only needs to keep the level bubble 3102 centered (i.e., the level bubble 3102 is located in the equally divided space in the middle of the tube body 3100), which means the knife is at the correct sharpening angle or grinding angle, resulting in a more precise blade sharpening angle.

[0149] III. Other scenarios requiring angle detection

[0150] 1. In horizontal assembly work, when it is necessary to check the horizontal angle of a workpiece, a device for observing and positioning the grinding angle of a cutting edge (preferably a folded device, meaning the first support 2000 and the level bubble 3000 are both housed within the third recess 1004 of the base 1000) is placed on the plane of the workpiece to be checked. The position of the level bubble 3102 is then observed. If the level bubble 3102 is centered (i.e., the level bubble 3102 is located within the equally divided space in the middle of the tube body 3100), then the plane is horizontal; otherwise, the plane is tilted. Because the device for observing and positioning the grinding angle of a cutting edge is small, it can be carried and used at any time. The level bubble 3000 of the device is used to determine the horizontality of the corresponding plane of the workpiece or item.

[0151] 2. When angular assembly of a workpiece is required, the base 1000 of a device for observing and positioning the grinding angle of a cutting edge is attached to the surface of the workpiece to be inspected, or fixed by other means (by pasting or by the operator pressing the base 1000). The second bracket 4000 is opened, the first bracket 2000 is raised, and the indicator 2600 is adjusted to the specified angle scale value 4301. Then, keeping the relative position between the device for observing and positioning the grinding angle of a cutting edge and the surface of the workpiece to be inspected unchanged, the device for observing and positioning the grinding angle of a cutting edge and the workpiece are rotated synchronously clockwise or counterclockwise until the level bubble 3102 is centered (i.e., the level bubble 3102 is located in the equally divided space in the middle of the tube body 3100). At this time, the angle of the surface of the workpiece to be inspected is the specified angle (i.e., the angle of the workpiece is the same as the specified angle scale value 4301), thus achieving precise angular installation of the workpiece. The whole operation is simple and convenient.

[0152] See Figures 16 to 17 In specific embodiment 3, this embodiment 3 provides a device for observing and positioning the grinding angle of a blade. The outermost side of the first connecting segment 1100 is provided with two first highest points 1106. The first highest point 1106 is the most protruding position on the outermost side of the first connecting segment 1100. The straight line formed by connecting the two first highest points 1106 is parallel to the level bubble 3000. The height of the outer end of the third rectangular block 4104 does not exceed the height of the first highest point 1106. That is to say, the outer end of the third rectangular block 4104 will not exceed the straight line formed by connecting the two first highest points 1106. When the first connecting segment 1100 corresponding to the base 1000 is in contact with any plane, the level bubble 3000 is horizontal with the plane, which makes it convenient to use the level bubble to measure whether the plane is horizontal.

[0153] The outermost part of the second connecting segment 1200 is provided with two second highest points 1206. The second highest point 1206 is the outermost and most protruding position of the second connecting segment 1200. The straight line formed by the line connecting the two second highest points 1206 is parallel to the level bubble 3000. The height of the outer end of the fourth rectangular block 4204 does not exceed the height of the second highest point 1206. That is to say, the outer end of the fourth rectangular block 4204 will not exceed the straight line formed by the line connecting the second highest points 1206. When the second connecting segment 1200 corresponding to the base 1000 is in contact with any plane, the level bubble 3000 is horizontal with the plane, which makes it convenient to use the level bubble to measure whether the plane is horizontal.

[0154] The plane at the bottom of the base 1000 is parallel to the horizontal bubble 3000. When the bottom of the base 1000 is placed on the blade, the horizontal bubble 3000 is parallel to the center line of the blade.

[0155] The second end 1102 of the first connecting section and the second end 1202 of the second connecting section are both provided with outwardly extending extensions, and the two extensions intersect to form an extension 1400. The extension 1400 and the first connecting section 1300 form a hanging hole 1401. The outer surface of the extension 1400 is straight or planar, and the outer surface of the extension 1400 is perpendicular to the horizontal bubble 3000.

[0156] The straight line formed by connecting the first end 1101 of the first connecting segment and the first end 1201 of the second connecting segment is parallel to the horizontal bubble 3000.

[0157] Such a device for observing and locating the grinding angle of a blade has at least three surfaces (left and right viewing angles and upward viewing angles) parallel to the horizontal bubble 3000, and at least two surfaces (front and rear viewing angles) perpendicular to the horizontal bubble 3000. When the device for observing and locating the grinding angle of a blade is in a folded state, one or more of the above five surfaces can be used in conjunction with the horizontal bubble 3000 to measure whether the plane of other objects is horizontal or vertical.

[0158] The terms used in this article, such as top, bottom, front, back, left, right, front, back, horizontal, and vertical, are for descriptive purposes only and are not intended to limit the product. If the product is rotated or its angle is changed, the corresponding orientation will also change.

[0159] The term “and / or” as used herein includes any and all combinations of one or more of the related listed items.

[0160] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A device for observing and positioning the grinding angle of a cutting edge, characterized in that: The device includes a horizontal bubble (3000) for observing changes in the blade sharpening angle and positioning the blade sharpening angle, and a base (1000) for fixing the device to the blade. The level bubble (3000) and the base (1000) are rotatably connected for adjusting the angle between the level bubble (3000) and the base (1000); The device includes a first bracket (2000) and a second bracket (4000) for fixing a level bubble (3000). The first end of the base (1000) is rotatably connected to the first end of the second bracket (4000), and the second end of the base (1000) is rotatably connected to the second end of the first bracket (2000). The first end of the first bracket (2000) is movably connected to the second bracket (4000) for adjusting the angle (1001) between the first bracket (2000) and the base (1000).

2. The device for observing and positioning the grinding angle of a cutting edge according to claim 1, characterized in that: The horizontal bubble (3000) and the base (1000) are axially rotatably connected.

3. The device for observing and positioning the grinding angle of a cutting edge according to claim 2, characterized in that: The first end of the base (1000) is axially rotatably connected to the first end of the second bracket (4000), and the second end of the base (1000) is axially rotatably connected to the second end of the first bracket (2000).

4. The device for observing and positioning the grinding angle of a cutting edge according to claim 3, characterized in that: The base (1000) includes a first connecting section (1100) and a second connecting section (1200). The second end (1102) of the first connecting section is connected to the second end (1202) of the second connecting section through a first connecting part (1300) to form a third recess (1004) for accommodating the first bracket (2000) and the level bubble (3000).

5. The device for observing and positioning the grinding angle of a cutting edge according to claim 4, characterized in that: The first bracket (2000) includes a third connecting segment (2100) and a fourth connecting segment (2200). The first end (2101) of the third connecting segment is connected to the first end (2201) of the fourth connecting segment through a second connecting part (2300) to form a first concave part (2001) for placing a horizontal bubble (3000).

6. The device for observing and positioning the grinding angle of a cutting edge according to claim 5, characterized in that: The second bracket (4000) includes a fifth connecting segment (4100) and a sixth connecting segment (4200). The second end (4102) of the fifth connecting segment is connected to the second end (4202) of the sixth connecting segment via a fourth connecting part (4500) to form a second recess (4001) for matching with the second connecting part (2300) of the first bracket (2000).

7. The device for observing and positioning the grinding angle of a cutting edge according to claim 6, characterized in that: The second end (2102) of the third connecting section is provided with a first auxiliary fixing part (2104) for fixing the level bubble (3000). And / or the second end (2202) of the fourth connecting segment is provided with a second auxiliary fixing part (2204) for fixing the level bubble (3000); A third auxiliary fixing part (2400) for fixing the bubble level (3000) is provided between the first end (2101) of the third connecting segment and the first end (2201) of the fourth connecting segment; and / or the third connecting segment (2100) and the fourth connecting segment (2200) are further provided with a fourth auxiliary fixing part (2500) for fixing the bubble level (3000).

8. The device for observing and positioning the grinding angle of a cutting edge according to claim 7, characterized in that: The second bracket (4000) is set with an angle value scale (4300); And / or the fifth connecting segment (4100) is provided with a plurality of teeth (4002) on one side corresponding to the second concave portion (4001). And / or the sixth connecting segment (4200) is provided with a plurality of teeth (4002) on one side corresponding to the second recess (4001); And / or the second connecting part (2300) is provided with raised ribs (2301) on one or both sides, and the raised ribs (2301) match the teeth (4002); And / or the second connecting part (2300) is provided with an indicator (2600) for indicating the angle between the first bracket (2000) and the base (1000).

9. The device for observing and positioning the grinding angle of a cutting edge according to claim 8, characterized in that: The fifth connecting section (4100) is provided with a fifth step (4105) on the rear side, and the sixth connecting section (4200) is provided with a sixth step (4205) on the rear side. The first end (2101) of the third connecting segment forms a third protrusion (2105) on one side of the second connecting part (2300), and the first end (2201) of the fourth connecting segment forms a fourth protrusion (2205) on the other side of the second connecting part (2300). The third protrusion (2105) moves along the fifth step (4105), and the fourth protrusion (2205) moves along the sixth step (4205); The indicator part (2600) includes two pointed indicator heads (2601) located at both ends of the indicator part (2600). Each of the two pointed indicator heads (2601) corresponds to a protruding rib (2301), and a horizontal indicator groove (2602) is provided between the two pointed indicator heads (2601). The two pointed indicator heads (2601) together with the third protrusion (2105) and the fourth protrusion (2205) form two recesses (2700) respectively, and the two raised ribs (2301) are located in the corresponding recesses (2700).

10. The device for observing and positioning the grinding angle of a cutting edge according to claim 9, characterized in that: The second end (1102) of the first connecting segment is provided with a first shaft hole (1103), and the second end (1202) of the second connecting segment is provided with a second shaft hole (1203). The first end (1101) of the first connecting segment is provided with a third shaft hole (1104), and the first end (1201) of the second connecting segment is provided with a fourth shaft hole (1204). The second end (2102) of the third connecting segment is provided with a first shaft (2103), and the second end (2202) of the fourth connecting segment is provided with a second shaft (2203). The first shaft (2103) matches the first shaft hole (1103), and the second shaft (2203) matches the second shaft hole (1203). The first end (4101) of the fifth connecting segment is provided with a third shaft (4103) on the outside, and the first end (4201) of the sixth connecting segment is provided with a fourth shaft (4203) on the outside. The third shaft (4103) matches the third shaft hole (1104), and the fourth shaft (4203) matches the fourth shaft hole (1204). The third axis (4103) has a third rectangular block (4104) at its outer end, and the fourth axis (4203) has a fourth rectangular block (4204) at its outer end. The first end (1101) of the first connecting segment has a third rectangular hole (1105), and the third axis hole (1104) is located in the middle of the third rectangular hole (1105). The first end (1201) of the second connecting segment has a fourth rectangular hole (1205), and the fourth axis hole (1204) is located in the middle of the fourth rectangular hole (1205). The third rectangular block (4104) and the third rectangular hole (1105) are interlocked based on the third axis (4103), and the fourth rectangular block (4204) and the fourth rectangular hole (1205) are interlocked based on the fourth axis (4203).

11. The device for observing and positioning the grinding angle of a cutting edge according to claim 10, characterized in that: The fifth connecting section (4100) has an angle scale (4300) on its front side for displaying the angle between the first bracket (2000) and the base (1000). The sixth connecting section (4200) has a plurality of first protrusions (4302) on its front side. A first groove (4303) is formed between adjacent first protrusions (4302). The plurality of first grooves (4303) correspond to different angle values ​​between the first bracket (2000) and the base (1000). The rear side of the first end (4101) of the fifth connecting segment and the rear side of the first end (4201) of the sixth connecting segment are connected by a third connecting part (4400); The fourth connecting part (4500) has a second groove (4501) on one or both sides, and a second protrusion (1500) is provided on the inner side of the second end (1102) of the first connecting segment and / or the inner side of the second end (1202) of the second connecting segment. The second protrusion (1500) matches the second groove (4501) to realize a detachable connection between the fourth connecting part (4500) and the base (1000).

12. The device for observing and positioning the grinding angle of a cutting edge according to claim 11, characterized in that: The first connecting part (1300) has a first recess (1301) on the side facing the first bracket (2000), and the fourth connecting part (4500) has a fourth recess (4502) on the side facing the base (1000). The first recess (1301) and the fourth recess (4502) are in corresponding positions. And / or the first connecting segment (1100) and the second connecting segment (1200) are arranged in parallel, and / or the third connecting segment (2100) and the fourth connecting segment (2200) are arranged in parallel, and / or the fifth connecting segment (4100) and the sixth connecting segment (4200) are arranged in parallel; And / or the fifth step (4105) is arc-shaped, and the third protrusion (2105) moves in an arc along the fifth step (4105); And / or the sixth step (4205) is arc-shaped, and the fourth protrusion (2205) moves in an arc along the sixth step (4205); And / or the outermost side of the first connecting segment (1100) is provided with two first highest points (1106), the straight line formed by the line connecting the two first highest points (1106) is parallel to the horizontal bubble (3000), and the height of the outer end of the third rectangular block (4104) does not exceed the height of the first highest point (1106); And / or the outermost side of the second connecting segment (1200) is provided with two second highest points (1206), the straight line formed by the line connecting the two second highest points (1206) is parallel to the horizontal bubble (3000), and the height of the outer end of the fourth rectangular block (4204) does not exceed the height of the second highest point (1206); And / or the plane at the bottom of the base (1000) is parallel to the horizontal bubble (3000); And / or the second end (1102) of the first connecting segment and the second end (1202) of the second connecting segment are provided with an outwardly extending extension segment and the two extension segments intersect to form an extension portion (1400). The extension portion (1400) forms a hanging hole (1401) with the first connecting portion (1300). The outer surface of the extension portion (1400) is straight or planar, and the outer surface of the extension portion (1400) is perpendicular to the horizontal bubble (3000). The straight line formed by connecting the first end (1101) of the first connecting segment and the first end (1201) of the second connecting segment is parallel to the horizontal bubble (3000); Alternatively, the second bracket (4000) may be arc-shaped.

13. The device for observing and positioning the grinding angle of a cutting edge according to claim 12, characterized in that: The base (1000) is provided with a magnet (1003), or the base (1000) is provided with a clamp for fixing the base (1000) to the blade, or the base (1000) is provided with a suction cup for fixing the base (1000) to the blade, or the base (1000) is provided with an adhesive part for fixing the base (1000) to the blade; and / or the base (1000) is also provided with a hanging hole (1401). Alternatively, the length, height, and width of the device used to observe and position the blade grinding angle shall not exceed 8cm.

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