Bench grinder equipment

Abstract

The present invention relates to a bench grinder apparatus. The object of the present invention is to provide a bench grinder apparatus and method for safely and accurately grinding a tool while minimizing damage to the tool and the user during grinding. The bench grinder apparatus for grinding a tool comprises: - at least one grinding wheel having a grinding surface, the grinding wheel being arranged in a wheel housing, wherein the wheel housing is provided with a working opening, the working opening providing access to a portion of the grinding surface; - an operating device, the operating device being arranged relative to the grinding wheel and capable of rotating the grinding wheel; - at least one tool holder, the tool holder being movably connected to the wheel housing and being arranged at a predetermined distance from the grinding wheel; - at least one angle adjustment device, the angle adjustment device being capable of moving the tool holder from a first grinding angle position to a second grinding angle position at a predetermined distance.

Description

Technical Field

[0001] The invention relates to a bench grinder device. Background Art

[0002] A bench grinder is a useful tool for performing important tool repair tasks. The grinding wheel of a bench grinder for knives spins at high speeds to trim wood, metal, and plastic, or to sharpen blades. Most professional knife sharpening machines use a bench grinder to achieve their craft.

[0003] Depending on the intended use of the grinding wheel, a variety of profiles and cross-sections are available. Grinding wheels are usually made of a solid steel or aluminum disk with grains bonded to the surface. As the grinding wheel rotates on the grinding machine, it wears away the metal surface, causing the sharp edges of the grains to break off to leave a sharper edge or wear away. Gradually, the worn grains are pulled out of the binder to expose the sharper grains in place behind them. Bench grinder equipment can be equipped with grinding wheels of different grit sizes for roughing and finishing operations. Bench grinder equipment is very heavy and is fixed to a workbench or floor stand, making it difficult to move to another location.

[0004] US 4936053 A discloses a tool holder for a lawn mower blade having an adjustable device for changing the distance / grinding angle between the grinding wheel and the holder. The adjustable device for changing the distance / grinding angle has to be adjusted individually for each grinding of the tool. The holder is difficult for the user to use and takes time to adjust the correct position and the correct grinding angle. The result is a very expensive and complicated grinding process. Due to the difficulty in keeping the lawn mower blade stable during grinding, the grinding quality is poor. There is also a risk of injury to the user when the lawn mower blade is set in the tool holder and during the grinding of the lawn mower blade.

[0005] Most knives are sharpened while the user holds the tool and moves it accordingly. This is both dangerous for the user and provides unstable and inaccurate results. Since user error is very easy to occur, the tool may be defective during grinding, and worse, the user may be injured during the grinding process.

[0006] Purpose of the Invention

[0007] It is an object of the present invention to provide a bench grinder apparatus and method for safely and accurately grinding a tool while minimizing damage to the tool and the user during grinding. Summary of the invention

[0008] The present invention solves this problem by providing a bench grinder apparatus for grinding tools, the bench grinder apparatus comprising:

[0009] at least one grinding wheel having a grinding surface, the grinding surface being arranged in a wheel housing, wherein the wheel housing is provided with a working opening, the working opening providing access to a portion of the grinding surface,

[0010] - an operating device, which is arranged relative to the grinding wheel and is capable of rotating the grinding wheel,

[0011] at least one tool holder, which is movably connected to the wheel housing and which is arranged at a predetermined distance from the grinding wheel,

[0012] - at least one angle adjustment device capable of moving said tool holder from a first grinding angle position to a second grinding angle position at said predetermined distance from the grinding wheel.

[0013] Bench grinder apparatus is particularly useful in metalworking processes where the process of adjusting components of different sizes needs to be simplified and convenient for the user. Bench grinder apparatus may be used for repair and maintenance purposes where different types of tools may need to be ground to properly perform the tool function. The present invention provides a bench grinder apparatus having enhanced controllability and consistency in handling the tool during grinding. Alternatively, the portable bench grinder apparatus may be a portable bench grinder apparatus.

[0014] Bench grinder equipment can be equipped with replaceable grinding wheels so that the grinding wheel is suitable for the intended use of the grinding wheel. A grinding wheel is a wheel composed of an abrasive composite that is used in a variety of grinding, abrasive cutting and lapping machining operations. Grinding wheels can be made of a solid steel disk or an aluminum disk with grains bonded to the grinding surface. Cut-off wheels have several characteristics, such as material hardness, grain size, wheel grade, grain spacing, and bond type. These characteristics are usually indicated by a code on the grinding wheel label.

[0015] Fine grinding wheels are usually used to grind or polish steel or other metal tools. Coarse grinding wheels are usually used to repair tools. The abrasive grains in the grinding wheel remove material from the tool. Therefore, the grinding process can be handled carefully and precisely so that the tool is not damaged in the process. The grinding process also cannot take too long due to maintenance costs. A balance of work must be provided.

[0016] The bench grinder device may be provided with a handle so that the bench grinder device is easily transported to another location. The bench grinder device may also be provided with a light source to emit light to the grinding work area, such as to emit light to a tool rack.

[0017] For safety protection, the grinding wheel can be arranged in the wheel housing. The wheel housing is provided with a working opening, which provides the user with access to a portion of the grinding surface. A protective cover is also provided for safety protection, for example, for protecting the user's face, especially the eyes, to prevent injury from being injured by a piece of a large amount of grinding wheel fragments and tool fragments, which are disposed of during grinding. The protective cover is pivotally connected to the wheel housing. The protective cover can cover a portion of the tool holding device, so that the portion of the tool holding device is arranged between the protective cover and the grinding wheel. The bench grinder device can also include a discharge system to discharge the grinding wheel fragments and tool fragments from the grinding area near the grinding wheel and the tool holder.

[0018] The grinding wheel includes a rubber surface. For example, the grinding wheel can be an aluminum wheel with a durable rubber coating or rubber layer. A grinding belt can be easily set on the grinding wheel, which is suitable for grinding items such as knives. When the grinding wheel is in a stop mode and not rotating, the grinding belt may not be tight. During grinding, when the grinding wheel rotates in a rotation mode, the rubber will be forced away from the rotating shaft. The rubber will expand outward and tighten the grinding belt to the grinding wheel, so that the grinding belt becomes firmly connected to the surface of the grinding wheel, thereby preventing any unnecessary vibration or oscillation during grinding and providing a smooth grinding function.

[0019] During grinding of metal objects, such as knives and tools etc., the rubber surface of the grinding wheel and / or the grinding belt may become hot. In order to prevent overheating during grinding, the rubber may be provided with a serrated surface for cooling purposes. The grooves in the rubber for cooling the grinding wheel provide a serrated surface, preventing the grinding wheel from increasing in heat during grinding. Therefore, the serrated rubber surface on the grinding wheel may have a predetermined pattern. The predetermined pattern may be related to the type of object to be ground and / or the rotation speed to be used during grinding.

[0020] Therefore, the grinding wheel can have an improved serrated dynamically balanced grinding wheel design to obtain high working efficiency, which increases the safety and durability of the bench grinder equipment.

[0021] The bench grinder apparatus may be provided with a replaceable grinding wheel, so that the user can change the grinding wheel so that it is optimal for the tool to be ground. Grinding wheel and / or grinding belt replacement is simple and quick. The bench grinder apparatus may provide a simple and quick process for shaping tool parts or various tools that need to be manufactured or repaired. The bench grinder apparatus may be operated partly manually and / or partly automatically using a control device.

[0022] An operating device is arranged relative to the grinding wheel, for example, the operating device is arranged in a control unit, and the control unit is connected to the base housing of the bench grinder device. The operating device can control a motor with an axis, which rotates the grinding wheel. The bench grinder device can be powered by batteries and / or electricity.

[0023] A tool such as a cutter or other tool can be easily arranged in the tool holder. Thereafter, the tool holder can be easily arranged relative to the tool holder. The tool holder is movably connected to the wheel housing and is arranged substantially adjacent to the grinding wheel, wherein the tool holder and the tool holder can be arranged substantially adjacent to the grinding wheel. The tool can then be kept in a stable position relative to the grinding wheel and in contact with the grinding wheel. The user does not need to hold the cutter during the grinding process, which provides safety for the user. The cutter is also kept in a stable position, which the user does not change during the grinding process. This reduces malfunctions during the grinding process.

[0024] The grinding wheel has a rubber layer surface, and the rubber layer surface is provided with a grinding belt, and the grinding belt includes a grinding surface arranged in the wheel shell. The rubber layer surface can be a serrated groove with a predetermined pattern. The wheel shell is provided with a working opening, which provides an entrance to a part of the grinding wheel and a part of the grinding surface. An airflow can be provided through the working opening. The airflow is generated by the rotation of the grinding wheel and discharges dust and / or sparks generated by grinding from the working area. Dust and / or sparks can be discharged from the bench grinder device through the tool holder or a part of the tool holder. The tool holder can be provided with an opening, so that dust and / or sparks can be discharged from the working area through the opening. Dust and / or sparks can be removed by using an exhaust system. An external exhaust system and exhaust device can be provided relative to the bench grinder device.

[0025] Preferably, the distance to the grinding wheel is kept constant to ensure accurate grinding of the tool. Some parts of the tool can be ground at one grinding angle and another part of the tool can be ground at another grinding angle. The bench grinder device includes a grinding angle scale. The bench grinder device includes at least one angle adjustment device. The angle adjustment device may include at least one retractable locking device to lock the tool holder in a predetermined position relative to the grinding surface. The angle adjustment device is capable of moving the tool holder from a first grinding angle position to a second grinding angle position at a predetermined distance from the grinding wheel. The angle adjustment device is also capable of moving the tool holder while rotating the grinding wheel. This ensures safe and accurate grinding of the tool and at the same time minimizes damage to the tool during grinding. The user does not have to stop the grinding process in order to further change the grinding angle or adjust the tool holder. This reduces the time and cost of grinding the tool.

[0026] In an advantageous embodiment of the invention, the angle adjustment device is able to move the tool holder steplessly using at least one sliding device. This makes it easy to provide a precise grinding angle between the tool and the grinding surface. The sliding device can be a groove or a track in which the angle adjustment device can slide back and forth. This makes it easy to provide a precise distance between the tool and the grinding surface.

[0027] In a further advantageous embodiment of the invention, the distance between the tool holder and the grinding wheel is adjustable using a distance adjustment device.

[0028] The tool holder can be adjusted relative to the grinding wheel. The distance between the tool holder and the grinding wheel depends on the shape and size of the tool to be ground. The distance adjustment device easily moves the tool holder in the horizontal and / or vertical direction away from or closer to the grinding wheel. When the tool holder is in the correct grinding position, the distance adjustment device connects the tool holder to the bench grinder device.

[0029] Alternatively, the distance adjustment device easily moves the tool holder with or without the tool holding device in the horizontal and / or vertical direction, making the tool holder away from or closer to the grinding wheel. When the tool holder (with or without the tool holding device) is in the correct grinding position, the distance adjustment device connects the tool holder to the bench grinder equipment.

[0030] The tool is arranged at a certain position on the tool holder. The distance between the tool and the grinding surface can be adjusted by the distance adjustment device. When the tool holder is moved from the first grinding angle position to the second grinding angle position, the distance to the grinding surface remains constant.

[0031] In an advantageous embodiment of the invention, the tool holder comprises a connecting device for connecting at least one tool holding device to the tool holder so that the tool holding device is arranged relative to the grinding wheel, and when the tool holder is moved, the angle adjustment device can move the tool holding device relative to the grinding wheel from a first position to a second position.

[0032] The tool holding device comprises a first flange and a second flange extending in substantially the same direction, wherein a flange distance between the first flange and the second flange is variable, wherein in use a tool is arranged between the first flange and the second flange.

[0033] The tool holding device is arranged relative to the tool holder. Part of the tool holding device is arranged above the tool holder. The first flange and the second flange extend away from the tool holder in substantially the same direction. The protective cover can cover parts of the first flange and the second flange, so that parts of the first flange and the second flange are arranged between the protective cover and the grinding wheel. A tool, such as a tool, is arranged between the first flange and the second flange. The cutting side on the blade of the tool faces upward and away from the tool holder. In order to achieve the purpose of a good tool, the edge of the cutting side must be sharp. If the edge of the cutting side is blunt, the blade can be sharpened using a bench grinder with a grinding wheel. Grind the edge of the cutting side until the cutting side becomes sharp again. The tool holding device ensures a safe grinding process for the user, so that the user does not need to hold the tool during the grinding process.

[0034] The tool holder can be arranged relative to the tool holder so that part of the tool holder is arranged above the tool holder, and the protective cover can cover part of the tool holder so that the part of the tool holder is arranged between the protective cover and the grinding wheel.

[0035] In another advantageous embodiment of the invention, the grinding angle is automatically adjustable using a control device to adjust the tool holder relative to the grinding wheel such that the tool holder moves from the first grinding angle position to the second grinding angle position at a predetermined distance from the grinding wheel.

[0036] The grinding of the tool may be performed by a controlled process. The control device may control one or more grinding functions. For example, the control device may control the speed of the grinding wheel, the grinding angle, and / or the distance between the tool and the grinding surface. The user may increase the grinding parameters. The control device may include a sensor capable of monitoring the grinding process. The grinding process may be related to the tool to be ground.

[0037] In a further advantageous embodiment of the invention, the tool holder comprises a connection device for connecting the tool holder to the tool holder in a predetermined position. The tool holder further comprises an opening for connecting the tool holder to the tool holder by means of the connection device. The tool holder may comprise a continuously adjustable connection device, so that the tool holder is continuously adjustable relative to the tool holder.

[0038] In a further advantageous embodiment of the invention, the tool holder comprises at least one elongated opening.

[0039] The tool holder can be perforated. When the grinding wheel rotates, an air flow is generated. The air flow captures the grinding dust and removes it through the openings to the exhaust port. Due to the openings in the tool holder, the grinding surface and the tool remain clean. This provides optimal tool grinding.

[0040] The tool holding device can be connected to a tool holder in a bench grinder.In a further advantageous embodiment of the invention, the tool holding device comprises at least one holding device, wherein the holding device is able to hold the tool in a grinding position.

[0041] The tool holder may comprise different shapes associated with a particular tool. During grinding, the tool may be correctly positioned in the shaped tool holder. The tool holder may comprise different shapes and sizes, such as grooves, protrusions and / or rails etc. The tool holder is provided with a connection device, so that the tool holder can be connected to a tool holder at a predetermined position.

[0042] The tool holder holding the tool can be adjusted relative to the grinding wheel, for example so that the blade of the tool is set at a grinding angle relative to the grinding wheel. The distance between the tool holder and the grinding wheel depends on the shape and size of the blade of the tool to be ground. The angle adjustment device easily pivots the tool holder relative to the grinding surface of the grinding wheel. The angle adjustment device connects the tool holder to the bench grinder device when the tool holder is in the correct grinding position. The angle adjustment device can be the same or equal to the distance adjustment device.

[0043] In a further advantageous embodiment of the invention, the tool holding device is adjustable in horizontal direction relative to the grinding wheel using a sliding device.

[0044] To ensure uniform grinding, the tool holder can be arranged on or in a sliding device, for example on or in a rail system. The tool holder can then slide back and forth on the rail system during grinding. If the shape of the cutting side is uniform along the edge of the cutting side, grinding will be easier to handle for the user, rather than the user holding the tool in their hands during grinding. If the shape of the cutting side is uneven along the edge of the cutting side, and if the angle adjustment device and the distance adjustment device can be automatically controlled by the operating device, the user can control the angle adjustment device and the distance adjustment device during the machining process.

[0045] In a further advantageous embodiment of the invention, the operating device controls the rotational speed of the grinding wheel.

[0046] The operating device can control the rotational speed of the grinding wheel. The rotational speed can be accelerated or decelerated, or maintained at a constant speed during the grinding process. The operating device can also take into account the type of grinding wheel and / or the size and / or shape of the tool to be ground. The operating device can also control the start and stop of the grinding process.

[0047] In another advantageous embodiment of the invention, the operating device controls the rotation direction of the grinding wheel so that the grinding wheel can be switched between clockwise and counterclockwise rotation relative to the rotating axis.

[0048] The operating device can control the direction of rotation of the grinding wheel. The direction of rotation can be clockwise and counterclockwise relative to the axis of rotation. The direction of rotation of the grinding wheel is important to control when shaping different types of tools. Bench grinder equipment tends to rotate downward toward the tool holder, where the tool is held. When rotating downward, unwanted burrs are formed on the top of the tool, such as on the edge of the cutting side of the tool. This is due to the deformation of the edge on the unsupported top surface of the tool when the grinding wheel moves to the edge.

[0049] A method for adjusting a tool holder in a grinding machine device comprises the following steps:

[0050] - Use the distance adjustment device to set the tool holder at a predetermined distance from the grinding wheel,

[0051] - Using at least one angle adjustment device, the tool holder is moved from a first grinding angle position to a second grinding angle position while maintaining a predetermined distance between the tool holder and the grinding wheel.

[0052] The tool holder is arranged at a predetermined distance from the grinding wheel using a distance adjustment device. The tool holder is moved from a first grinding angle position to a second grinding angle position using at least one angle adjustment device. The tool holder is kept at a predetermined distance from the grinding wheel.

[0053] A method for grinding a tool using a grinding machine comprises the following steps:

[0054] - provide the tool to be ground,

[0055] - arranging the tool on a tool holder or in a tool holding device on the tool holder and arranging the tool relative to the tool holder and the grinding wheel,

[0056] - placing the tool so that the tool part bears against the grinding surface of the grinding wheel at a predetermined angle,

[0057] - Make the grinding wheel rotate.

[0058] A method for grinding a tool using a grinding machine apparatus may include one or more of these steps, wherein the tool to be ground is arranged on a tool holder or in a tool holding device arranged on the tool holder. Alternatively, the tool is arranged in a grinding position relative to the grinding surface. The tool causes the tool part to abut against the grinding surface of the grinding wheel at a predetermined angle. The tool is ground while the grinding wheel is rotated. The grinding angle can be changed during grinding.

[0059] Then, the tool holder is moved from the first grinding angle position to the second grinding angle position using at least one angle adjustment device.

[0060] A method for grinding an article using a bench grinder apparatus comprises the following steps:

[0061] - provide the tool to be ground,

[0062] - arranging the tool in the tool holder and arranging the tool holder relative to the tool holder and the grinding wheel such that the tool and a part of the tool holder are covered with the protective cover,

[0063] - Make the grinding wheel rotate,

[0064] - Placing the tool part to be ground so that it rests on the grinding surface of the grinding wheel.

[0065] A bench grinder apparatus includes steps for grinding a tool or different types of tools. The bench grinder apparatus is placed in a position on a stable surface. A method for grinding a blade of a tool or other tool using a bench grinder apparatus includes one or more steps. First, a blunt tool is provided, wherein the blade of the tool needs to be sharpened. The tool is set in a tool holding device so that the cutting side on the tool blade faces upward and away from the tool holder. In addition, the tool holding device is set relative to the tool holder and the grinding wheel. The protective cover is pivoted to a position whereby the protective cover covers a portion of the tool and / or the tool holding device. During grinding, the tool holding device is fastened to the bench grinder apparatus in a fixed or variable position during grinding.

[0066] The distance between the tool holder and the grinding wheel is set so that the cutting side on the tool blade is in a predetermined position relative to the grinding wheel. The rotation direction of the grinding wheel is set to rotate clockwise or counterclockwise. The rotation speed of the grinding wheel is adjusted to a predetermined rotation speed. When the grinding wheel rotates, the edge of the tool blade is pressed against the grinding surface of the grinding wheel. During the grinding process, the grinding angle, rotation speed and rotation direction can be changed to provide a perfect grinding result.

[0067] When grinding a tool, an operating device is used to control the rotation speed or rotation direction of the grinding wheel. When grinding a tool, an angle adjustment device is used to adjust the grinding angle of the tool and the grinding wheel. The bench grinder device includes a control unit, which can control the operating device.

[0068] The invention has now been explained with reference to some embodiments which have been discussed merely to illustrate the many possibilities and design variations which may be achieved with embodiments of a bench grinder apparatus according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The embodiments of the present invention are described below with reference to the following contents:

[0070] Figure 1 An embodiment of a bench grinder apparatus is shown.

[0071] Figure 2 An embodiment of a bench grinder apparatus including a tool holding device is shown in a first side view.

[0072] Figure 3 An embodiment of a bench grinder apparatus including a tool holding device is shown in a second side view.

[0073] Figure 4 An embodiment of a bench grinder apparatus including a grinding angle scale is shown.

[0074] Figure 5a , 5b 5c shows an embodiment of a bench grinder apparatus including a tool holder arranged at different grinding angles.

[0075] Figure 6a , 6b An embodiment of a tool rack is shown.

[0076] Figure 7a , 7b 7c and 7d show embodiments of tool holding devices placed at different positions on a tool rack.

[0077] Figure 8a , 8b A grinding wheel comprising a rubber surface is shown. DETAILED DESCRIPTION

[0078] In the following detailed description, embodiments of the present invention are explained. It should be understood that the scope of the present invention is not limited to the following description or as shown in the accompanying drawings. The present invention is capable of other embodiments and can be practiced or carried out in various ways.

[0079] Figure 1 An embodiment of a bench grinder device 1 is shown. The bench grinder device 1 comprises a portable base housing 2 having a handle 3. The bench grinder device 1 further comprises operating means, such as a motor 4, a control unit 5 and a wheel housing 6. A grinding wheel 7 is arranged in the wheel housing 6 so that the grinding wheel can be rotated by the motor 4. The wheel housing 6 is provided with a working opening 8, which provides access to a part of the grinding surface on the grinding wheel 7.

[0080] The tool holder 9 is movably connected to the wheel housing 6 using a distance adjustment device 10, so that the tool holder 9 can change its position relative to the wheel housing 6 and the grinding wheel. The distance adjustment device 10 can be a threaded rod and a nut and / or a plurality of nuts, which can be fastened to each side of the tool holder 9 and / or the wheel housing 6. The tool holder 9 can be set at a predetermined position substantially adjacent to the grinding wheel 7. The tool holder 9 is set at a predetermined position that provides a gap between the tool holder 9 and the grinding surface of the grinding wheel 7, so that the tool holder 9 is not accidentally ground and / or damaged by the grinding wheel 7.

[0081] The shield 11 is a safety shield disposed above the tool holder 9, covering the hole of the working opening 8 or a portion of the working opening 8. The shield 11 is pivotally connected to the wheel housing so that the shield 11 can be pivoted upward and away from the tool holder 9. The shield 11 can be a transparent plate and / or a magnifying plate.

[0082] The bench grinder device 1 is provided with a control unit 5 , wherein the control unit 5 comprises operating means for controlling, for example, an on / off function, a rotation speed and a rotation direction of the grinding wheel 7 .

[0083] When the operating device is switched to a selected rotation direction, the rotation direction of the grinding wheel 7 can be switched between clockwise and counterclockwise rotation. When the operating device is adjusted stepwise and / or steplessly, the rotation speed of the grinding wheel 7 is adjustable. When grinding a tool, the rotation direction and the rotation speed can be operated simultaneously and relative to each other.

[0084] During grinding of the tool, the rubber surface of the grinding wheel 7 and / or the grinding belt may become hot. To prevent overheating during grinding, the rubber may be provided with a serrated surface for cooling purposes. The grooves in the rubber for cooling the grinding wheel provide the serrated surface. The working opening 8 and the grooves in the rubber provide an airflow generated when the grinding wheel 7 rotates. This prevents the heat of the grinding wheel from raising the temperature during grinding. The grinding wheel 7 has an improved serrated dynamic balanced grinding wheel design to improve working efficiency, which increases the safety and durability of the bench grinder device 1.

[0085] Figure 2 An embodiment of a bench grinder apparatus 1 comprising a tool holder 12 is shown in a first side view. The tool holder 12 holds a tool to be sharpened using a grinding wheel 7. The tool holder 12 is arranged relative to the tool holder 9. Part of the tool holder 12 is arranged above the tool holder 9 and part of the tool holder 12 is arranged below the tool holder 9. The part of the tool holder 12 arranged above the tool holder 9 is partially covered by the protective cover 11, so that part of the tool holder 12 is arranged between the protective cover 11 and the grinding wheel 7. The tool 13 can engage the grinding surface of the grinding wheel 7.

[0086] The tool holding device 12 comprises a tool plate or a flange so that the tool 13 can be held in a fixed position during grinding. The tool holding device 12 is capable of holding tools 13 or other types of tools of different sizes or shapes. If the tool holding device 12 comprises two plates or two flanges, the tool 13 can be securely arranged between the two plates or two flanges. The distance between the two plates can be varied accordingly so as to clamp the tool 13 in the correct grinding position.

[0087] The cutting side on the blade of the tool 13 faces upward and away from the tool holder 9. For the purpose of a good tool 13, the edge of the cutting side must be sharp. If the edge of the cutting side is dull, the blade can be sharpened using a bench grinder with a grinding wheel 7. Carefully press the edge of the blade against the rotating grinding wheel 7. Grind the edge of the cutting side until the cutting side becomes sharp again.

[0088] The distance between the tool holder 12 and the grinding wheel 7 can be adjusted using a distance adjustment device, which adjusts the tool holder 12 to a predetermined distance from the grinding wheel 7. The adjustable tool holder 12 is adjusted so that the tool 13 fixed in the tool holder 12 provides an optimal predetermined distance for the grinding effect on the blade of the tool 13. In addition, the tool 13 fixed in the tool holder 12 has a predetermined pressure towards the grinding surface to achieve an optimal grinding effect on the blade of the tool 13. If the predetermined distance and / or pressure are not optimal for the grinding effect, the grinding effect may cause irreversible damage to the tool 13 or the tool.

[0089] The X-axis represents the axis of the blade of the tool 13, and the Y-axis represents the tangential axis of the grinding surface of the grinding wheel 7. The angle between the X-axis and the Y-axis is the grinding angle The tool holding device is adjusted by using the angle adjustment device to adjust the grinding angle of the blade of the tool 13 relative to the grinding wheel 7. When the grinding wheel 7 rotates, the grinding angle of the blade of the tool 13 relative to the grinding surface A grinding effect is produced on the blade of the tool 13. During grinding, the grinding angle of the blade of the tool 13 relative to the grinding wheel 7 can vary. If the predetermined grinding angle is not optimal, the grinding effect can lead to prolonged grinding time and / or irreversible damage to the tool 13 or the tool.

[0090] Using slides, the tool holder can be adjusted horizontally relative to the grinding wheel. These slides are Figure 2 The slide device may be a rail that can slide the tool holder 12 to the first side or the second side relative to the grinding wheel 7. The slide device provides a uniform grinding effect for the blade of the tool 13 when the blade of the tool 13 is held in a predetermined position during grinding.

[0091] Figure 3 An embodiment of a bench grinder apparatus including a tool holder is shown in a second side view. A method for grinding a blade of a tool 13 using a grinder apparatus 1 comprises one or more of the following steps: First, one or more tools 13 are provided, wherein the blade of the tool 13 needs to be sharpened. The tool is arranged in a tool holder 12, and the tool holder 13 is arranged relative to the tool holder 9 and the grinding wheel 7. The protective cover 11 is arranged in a position so that the protective cover 11 covers the tool 13 and a part of the tool holder. During grinding, the tool holder 12 is fastened in a fixed position of the bench grinder apparatus 1.

[0092] The distance between the tool holding device 12 and the grinding wheel 7 is set so that the blade of the tool 13 is placed at a predetermined position relative to the grinding wheel 7. Figure 2 As shown, the grinding angle of the blade of the tool 13 is It is also arranged at a predetermined position relative to the grinding wheel 7.

[0093] The rotation direction of the grinding wheel 7 is set to clockwise or counterclockwise rotation. The rotation speed of the grinding wheel 7 is adjusted to a predetermined rotation speed, such as a low speed for sharpening the blade edge of the tool 13 or a high speed for fast and rough removal of metal. The blade of the tool 13 is pressed against the grinding surface of the grinding wheel, thereby sharpening the edge of the blade. During the grinding process, the grinding angle, rotation speed and rotation direction can be changed to provide a perfect grinding result.

[0094] Figure 4 An embodiment of a bench grinder apparatus including a grinding angle scale is shown. The distance from the tool holder 9 to the grinding wheel 7 is kept constant to ensure accurate grinding of the tool. Some parts of the tool can be ground at one grinding angle and another part of the tool can be ground at another grinding angle. The bench grinder apparatus includes a visible grinding angle scale 18. The bench grinder apparatus 1 includes at least one angle adjustment device, which includes an operating handle 3, a guide rail or a recess 19. The angle adjustment device may include at least one retractable locking device, which may be an operating handle that can be threadedly fastened in a certain position to lock the tool holder in a predetermined position relative to the grinding surface.

[0095] Figure 5a , 5b 5c shows an embodiment of a bench grinder apparatus including a tool holder arranged at different grinding angles. The angle adjustment device is capable of moving the tool holder upward and downward in an angled position and simultaneously moving the tool holder to a predetermined distance from the grinding wheel. The tool holder can slide from a first grinding angle position to a second grinding angle position. The angle adjustment device is also capable of moving the tool holder 9 as shown in dashed lines while rotating the grinding wheel. Figure 5a The tool holder 9 is shown at a grinding angle of approximately 70° positioned by the operating handle 31 in the guide rail. Figure 5b The tool holder 9 is shown at a grinding angle of about 25° positioned by the operating handle 32 in the guide rail. Figure 5c shows the tool holder 9 at a grinding angle of less than 15° positioned by the operating handle 33 in the guide rail. The user does not have to stop the grinding process in order to further change the grinding angle or adjust the tool holder.

[0096] Figure 6a and 6bAn embodiment of a tool holder is shown. The wheel housing is provided with a working opening which provides access to a portion of the grinding wheel 17 and a portion of the grinding surface 7. An air flow F can be provided through the working opening. The air flow F is generated by the rotation of the grinding wheel 17 and discharges dust and / or sparks generated by grinding from the working area. Dust and / or sparks can be discharged from the bench grinder device 1 through the tool holder 9 or a part of the tool holder 9. The tool holder 9 can be provided with openings 21, 22 so that dust and / or sparks can be discharged through the openings 21, 22 and leave the working area. Some openings 21 can be elongated and provide a larger area for air flow. Dust and / or sparks can be removed using an exhaust system. With respect to the bench grinder device 1, an external exhaust system and exhaust device can be provided, Figure 6a and 6b Not shown.

[0097] Figure 7a , 7b , 7c and 7d show embodiments of tool holders placed at different positions on the tool holder. The tool holder 9 may also include openings for connecting the tool holder 12 to the tool holder 9 using connecting means 23. The connecting means 23 may be a cotter pin / pin, a screw or a bolt. The tool holder includes connecting means for connecting the tool holder 12 to the tool holder at a predetermined position. The connecting means of the tool holder 12 may engage two different openings 21, 22 to maintain a predetermined position during grinding, such as Figure 7a and 7b shown. Figure 7c A tool holding device 12 ′, 12 ″ is shown which is divided into two parts and which enables the tool to be held in the correct position during grinding. Figure 7d . An embodiment of a tool holder 12 for holding a drill bit is shown. The tool holder 12 can hold drill bits of different sizes. The tool holder 12 can slide from one side to the other. The tool holder 12 comprises a continuously adjustable connection device, so that the tool holder is continuously adjustable relative to the tool holder 9, which is Figure 7a , 7b , 7c and 7d are not shown.

[0098] FIG8 shows a grinding wheel 7' comprising a rubber surface. The bench grinder apparatus 1 is provided with a replaceable grinding wheel 7' and / or grinding belt 7", so that the user can replace the grinding wheel 7' and / or grinding belt 7", so that the grinding wheel is optimal for the tool to be ground. When replacing the grinding wheel 7' and / or grinding belt 7", the wheel housing 6 is opened by pivoting part of the wheel housing 6 upward and away from the base housing 2, thereby exposing the grinding wheel 7' and grinding belt 7".

[0099] Figure 8aThe wheel housing 6 is shown opened. The spindle 14 is ready to receive the grinding wheel 7'. The grinding wheel 7' may comprise an aluminium wheel 15 having a durable rubber layer 16 and provided with a predetermined sawtooth pattern on a surface 17. The grinding belt 7" has a grinding surface 18 and is suitable for grinding knives and tools. The grinding belt 7" is adapted to the periphery of the grinding wheel 7'. The predetermined pattern on the surface 17 is related to the type of item to be ground and / or the rotation speed to be used during grinding.

[0100] Figure 8b An open wheel housing 6 is shown, which includes a grinding wheel 7' that receives a grinding belt 7". The grinding wheel 7' and / or the grinding belt 7" can be easily and quickly replaced. The grinding belt 7" is movably connected to the grinding wheel 7'. During the grinding process, when the grinding wheel 7' rotates, the rubber will be forced away from the rotating shaft due to the force opposite to the centripetal force. The rubber will expand outwards and tighten the grinding belt 7" to the grinding wheel 7', so that the grinding belt 7" becomes firmly connected to the surface of the grinding wheel 7'.

Claims

1. A bench grinder for grinding tools, characterized in that: The bench grinder equipment comprises: - at least one grinding wheel having a curved grinding surface, the grinding wheel being arranged in a wheel housing, wherein the wheel housing is provided with a working opening providing access to a portion of the grinding surface, - an operating device, which is arranged relative to the grinding wheel and is capable of rotating the grinding wheel, at least one tool holder movably connected to the wheel housing and arranged substantially adjacent to the curved grinding surface of the grinding wheel and at a predetermined distance from the curved grinding surface of the grinding wheel, - Angle adjustment means capable of moving the tool holder along a predetermined curve from a first grinding angle position to a second grinding angle position while maintaining the predetermined distance between the tool holder and the curved grinding surface, wherein the movement of the tool holder along the predetermined curve is facilitated by two separate guide rails for guiding the tool holder, so that the tool holder is guided in two guide rails simultaneously in a single movement.

2. The bench grinder equipment according to claim 1, characterized in that: The angle adjustment device can move the tool holder steplessly using a single slide device.

3. The bench grinder equipment according to claim 1 or 2, characterized in that: The bench grinder apparatus includes a distance adjustment device configured to adjust a predetermined distance between the tool holder and the grinding wheel.

4. The bench grinder equipment according to claim 1 or 2, characterized in that: The tool rack (9) is provided with through holes (21, 22) so that dust and / or sparks can be discharged from the working area through the through holes (21, 22).

5. The bench grinder equipment according to claim 1 or 2, characterized in that: The tool holder comprises a connecting device for connecting at least one tool holding device to the tool holder so that the tool holding device is arranged relative to the grinding wheel, and when the tool holding device is moved, the angle adjustment device can move the tool holding device from a first horizontal position to a second horizontal position relative to the curved grinding surface of the grinding wheel.

6. The bench grinder equipment according to claim 1 or 2, characterized in that: The grinding angle is automatically adjusted by a control device to adjust the tool holder relative to the grinding wheel so that the tool holder moves from the first grinding angle position to the second grinding angle position and maintains the predetermined distance from the tool holder to the curved surface of the grinding wheel.

7. The bench grinder equipment according to claim 1 or 2, characterized in that: The operating device controls the rotation speed of the grinding wheel.

8. The bench grinder equipment according to claim 1 or 2, characterized in that: The operating device controls the rotation direction of the grinding wheel so that the grinding wheel can switch between clockwise and counterclockwise rotation relative to the rotating shaft.

9. A tool holder for a bench grinder according to any one of claims 1 to 8, characterized in that: The tool rack comprises a connection device for connecting a tool holding device to the tool rack in a predetermined position.

10. The tool holder according to claim 9, characterized in that: The tool rack comprises an opening for connecting the tool holding device to the tool rack using the connecting device.

11. The tool holder according to claim 9 or 10, characterized in that: The tool holder comprises a continuously adjustable connection device, so that the tool holder is continuously adjustable relative to the tool holder.

12. The tool holder according to claim 9 or 10, characterized in that: The tool rack (9) is provided with through holes (21, 22) so that dust and / or sparks can be discharged from the working area through the through holes (21, 22).

13. A tool holding device for a bench grinder according to any one of claims 1 to 8, characterized in that: The tool holding device is connectable to a tool rack in the bench grinder apparatus.

14. The tool holding device according to claim 13, characterized in that The tool holding device comprises at least one holding device, wherein the holding device is capable of holding a tool in a grinding position.

15. A method for adjusting the angular position of a tool holder in a bench grinder according to any one of claims 1 to 8, characterized in that: The bench grinder apparatus comprises a grinding wheel having a curved grinding surface, the grinding wheel being disposed in a wheel housing, wherein the wheel housing is provided with a working opening, the working opening providing access to a portion of the grinding surface, the method comprising the following steps: - using a distance adjustment device to set the tool holder at a predetermined distance from the curved grinding surface of the grinding wheel, - using an angle adjustment device to move the tool holder from a first grinding angle position to a second grinding angle position along a predetermined curve while maintaining the predetermined distance between the tool holder and the curved grinding surface, wherein the movement of the tool holder along the predetermined curve is facilitated by two separate guide rails for guiding the tool holder, so that the tool holder is guided by the guide rails in both directions simultaneously in a single movement.

16. A method for grinding a tool using a bench grinder according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: - provide the tool to be ground, - arranging the tool on a tool holder or in a tool holding device on the tool holder and arranging the tool relative to the curved surface of the grinding wheel, - placing the tool so that a tool part bears against the grinding surface of the grinding wheel at a predetermined angle, - rotating the grinding wheel, and - moving the tool holder from a first grinding angle position to a second grinding angle position using an angle adjustment device while maintaining the predetermined distance from the tool holder to the grinding wheel.

17. The method according to claim 16, characterized in that The method further includes the step of ventilating the grinding wheel and the tool holder using air flow through a working opening.

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