An integrated rear protective cover for a self-cleaning, dust-free miter saw

Abstract

This invention relates to the field of miter saws, and particularly to an integrated rear protective cover for a self-cleaning, dust-free miter saw. The left end of the rear protective cover (3) covers the saw blade (2) of the miter saw, and its right end is connected to the inner front wall of the blade cover of the miter saw. The rear protective cover (3) and the blade cover together form an upper dust-collecting channel for absorbing most of the dust and debris carried out by the saw blade (2) during high-speed rotating cutting. During the cutting process, the rear protective cover (3) is always in contact with the wood. Whether pushing or pulling, the rear protective cover can be freely lifted by the wood and rotate around the connection point. The rear protective cover provided by this invention rotates naturally upward along the connection point when cutting wood, whether pushing or pulling, allowing the miter saw to be pushed and pulled freely. When cutting wood, the dust and debris above the wood enters the dust-collecting channel of the frame through the rear protective cover, resulting in good dust collection.

Description

Technical Field

[0001] This invention relates to the field of miter saws, and particularly to an integrated rear protective cover for a self-cleaning, dust-free miter saw. Background Technology

[0002] Miter saws are widely used in the machinery industry for cutting materials such as metal, wood, plastic sheets, and fiberboard. During actual cutting, a large amount of sawdust and other dust is inevitably generated, which has a certain impact on the health of operators and causes significant pollution to the surrounding environment. However, there is a demand for miter saws with less impact on the environment and worker health, making the development of a miter saw that does not pollute the environment with sawdust and dust extremely necessary. A miter saw generally includes a base, a rotating disc mounted on the base, a sawing mechanism with a motor and saw blade located above the rotating disc, and a baffle on the disc for positioning the wood. The sawing mechanism is rotatably coupled to the disc around a pivot axis fixed relative to it, thereby cutting the wood. Currently, common miter saws on the market, whether with or without a pull rod, lack a self-cleaning dust function, thus failing to guarantee the physical and mental health of operators and their working environment.

[0003] Currently, some bevel saws with dust-collecting structures have appeared on the market. Patent application CN108162078 discloses a dust-free distance fine-adjustment bevel saw. A dust-collecting cover is set between the saw blade and the motor assembly. The bottom of the dust-collecting cover is equipped with a fan blade and a dust collection bag. The dust-collecting cover includes a first dust-collecting pipe and a second dust-collecting pipe, which serve as a lower dust-collecting channel. The dust generated by the saw blade cutting the material is sucked into the first dust-collecting pipe and the second dust-collecting pipe under the action of the fan blade and discharged into the dust collection bag. However, this patent does not have a rear protective cover. The blade cover has poor protection for the saw blade. When cutting wood, there is no obstruction along the direction in which the wood chips fly out. The self-collecting device has difficulty sucking in the flying wood chips, resulting in a very poor dust collection effect.

[0004] Patent 2021107638418 discloses a self-cleaning, dust-free miter saw. It utilizes a dual-channel dust collection design at the rear of the saw blade, a rear protective cover above the saw blade, and a vacuum dust collection channel inside the blade cover for dust collection. The rear protective cover is positioned at the lower rear of the blade cover via a guide plate connected to the saw blade shaft. Guide posts are provided on the outer side of the rear protective cover away from the saw shaft, and the guide plate near the saw shaft end has arc-shaped grooves. The guide posts fit into these grooves, and the guide plate is used to push and pull the rear protective cover. However, during push-cut or pull-cutting processes, the relative movement of the rear protective cover and the guide plate causes the guide posts to become stuck in the arc-shaped grooves, resulting in the rear protective cover being jammed by the wood, thus preventing the miter saw from performing push-cut or pull-cutting operations. Summary of the Invention

[0005] The purpose of this invention is to solve the shortcomings of existing miter saws with dust-collecting structures that cannot move freely in the dust-free cutting process and can only be pushed or pulled to cut. Therefore, an integrated rear protective cover for self-collecting dust-free miter saws is proposed.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention provides an integrated rear protective cover for a self-cleaning, dust-free beveling saw, characterized in that the left end of the rear protective cover 3 covers the saw blade 2 of the beveling saw, and its right end is connected to the front inner wall of the blade cover of the beveling saw; the rear protective cover 3 and the blade cover together form an upper dust suction channel for absorbing most of the dust and debris brought out by the saw blade 2 during high-speed rotating cutting; wherein,

[0007] During the cutting process, the rear protective cover 3 is always in contact with the wood and is lifted up by the wood, rotating upward around the connection point, with its upper left corner always close to the inner wall of the blade cover.

[0008] As an improvement to the aforementioned device, the oblique cutting saw includes: a base, a disc mounted on the base, and a sawing structure disposed above the disc; wherein,

[0009] The sawing mechanism includes a saw blade, a blade cover disposed above the saw blade, and an upper dust suction channel;

[0010] The bevel saw also includes a lower dust suction channel, which is located at the rear of the disc. One end of the lower dust suction channel is connected to the disc, and the other end of the lower dust suction channel is connected to the self-dust suction device of the bevel saw through a pipe. The lower dust suction channel includes a dust outlet assembly.

[0011] The dust outlet assembly includes an upper channel and a lower channel, wherein,

[0012] The upper channel has a curved groove structure to collect dust and debris from above the disc platform;

[0013] The lower channel is connected to the cavity below the disc cutter plate, and is used to collect dust and debris from below the cutter plate.

[0014] As an improvement to the aforementioned device, the rear protective cover 3 includes: a front section of the rear protective cover, an arc-shaped transition connecting section, and a rear section of the rear protective cover; wherein,

[0015] The outermost part of the front section of the rear protective cover has an arc-shaped groove for covering the saw blade 2;

[0016] The arc-shaped transition section forms a protrusion to cover the protruding saw blade locking screw 32;

[0017] The rear section of the rear protective cover is rotatably connected to the front inner wall of the blade cover.

[0018] As an improvement to the above-mentioned device, the front section of the rear protective cover is provided with a limiting opening 25. The upper left corner of the rear protective cover is limited inside the blade cover by a positioning screw through the limiting opening 25. One end of the positioning screw passes through the limiting opening 25 and is fixed to the inner wall of the blade cover.

[0019] As an improvement to the aforementioned device, the top plate of the front section of the rear protective cover is arc-shaped, and its two side plates are fan-shaped, together forming an arc-shaped groove.

[0020] As an improvement to the above-mentioned device, the arc-shaped transition connecting section of the rear protective cover 3 is obtuse, and its position corresponds to the position of the saw blade locking screw 32; wherein, the depth of the arc-shaped transition connecting section is greater than the distance by which the saw blade 2 locking screw protrudes from the saw blade 2; and the width of the arc-shaped transition connecting section is greater than the diameter of the saw blade locking screw 32.

[0021] As an improvement to the above-mentioned device, the rear section 3 of the rear protective cover is triangular near the connection point, which is used to avoid the wood when the rear protective cover 3 falls naturally.

[0022] As an improvement to the above-mentioned device, a rear protective cover roller 4 is also provided at the front section of the rear protective cover where it is in contact with the wood.

[0023] As an improvement to the above-mentioned device, during the process of the rear protective cover 3 being lifted by the wood, the outermost outer wall of the front section of the rear protective cover, in the pushing and cutting state, fits against the cutting object from top to bottom; wherein, the tangent at the point where the rear protective cover fits against the wood forms an angle of 40-45 degrees with the upper surface of the wood.

[0024] During the cutting process, the wood pushes the rear protective cover 3 upwards through the outermost part of the front section of the rear protective cover, and then the lower left corner of the rear protective cover 3 rests against the wood.

[0025] During the cutting process, the wood pushes the rear protective cover 3 upwards through the lower side of the rear protective cover 3, and the lower left corner of the rear protective cover 3 rests against the wood.

[0026] The upper left corner of the front section of the rear protective cover is always close to the inner wall of the blade cover. The integrated rear protective cover for a self-cleaning, dust-free miter saw provided by this invention has the following advantages:

[0027] 1) The rear protective cover provided by the present invention is installed on the outer blade cover. When cutting wood, whether pushing or pulling, the rear protective cover will rotate naturally upward along the connection point.

[0028] 2) The outermost side of the rear protective cover can be smoothly pushed up by the wood in the push-cut state, and in the pull-cut state, the lower side always adheres to the wood to ensure the best dust collection effect.

[0029] 3) When the outermost edge of the rear protective cover is in the pushing and cutting state, the tangent at any point on the arc surface forms an angle of 40-45 degrees with the wood, thus ensuring that the wood can lift the rear protective cover to complete the cut smoothly in the pushing and cutting state.

[0030] 4) The unique design of the saw blade rear guard allows the rear guard to move freely when pushed or pulled, while dust and debris on the wood during cutting enter the dust suction channel of the frame through the rear guard.

[0031] 5) The variety of cutting methods makes cutting more convenient and faster. Attached Figure Description

[0032] Figure 1 A perspective view of the rear protective cover 3 provided by the present invention;

[0033] Figure 2 A second perspective view of the rear protective cover 3 provided by the present invention;

[0034] Figure 3 Exploded view of a bevel saw with a rear guard installed;

[0035] Figure 4 A diagram showing the self-dust-collecting structure of a bevel saw with a rear protective cover installed.

[0036] Figure 5 Exploded view of the sawing mechanism of a bevel saw with a rear guard installed;

[0037] Figure 6 This is a partial view of the upper passage;

[0038] Figure 7 This is a second partial view of the upper passage;

[0039] Figure 8 This is the main view of the upper passage;

[0040] Figure 9 Airflow diagram of a self-dust-collecting structure for a bevel cutter with a rear protective cover;

[0041] Figure 10 A diagram of the dust collection cover for a bevel saw with a rear guard installed.

[0042] Figure 11 Diagram of the dust extraction port of a bevel saw with a rear protective cover installed;

[0043] Figure 12 This is a first schematic diagram of the integrated rear protective cover in the push-cut state;

[0044] Figure 13 This is a second schematic diagram of the integrated rear protective cover in the push-cut state.

[0045] Attached Figure Labels

[0046] 1. Left blade cover; 2. Saw blade; 3. Rear protective cover; 4. Protective cover roller; 5. Dust suction cover; 6. Right blade cover; 7. Volute A; 8. Volute B; 9. Wind deflector A; 10. Wind deflector B; 11. Armature assembly; 12. Stator; 13. Housing; 14. Housing rear cover; 15. Dust outlet elbow; 16. Dust outlet assembly; 17. Cutting plate; 18. Lower dust suction hose; 19. 20. Protective cover, 21. Disc, 22. Base, 23. Dust outlet hose, 24. Dust collection bag, 25. Rear protective cover connection opening, 26. Limiting opening, 27. Upper channel, 28. Lower channel, 29. Guide rib plate, 30. Dust suction port, 31. Dust suction chamber, 32. Wood, 33. Saw blade locking screw, 34. Outer pressure plate, 35. Inner pressure plate, 36. Output shaft, 37. Protective cover fixing plate. Detailed Implementation

[0047] The technical solutions provided by the present invention will be further illustrated below with reference to the embodiments.

[0048] The invention will now be further described with reference to the accompanying drawings.

[0049] This invention provides an integrated rear protective cover for a self-cleaning, dust-free miter saw, such as... Figure 12-13 As shown, the left end of the rear protective cover 3 covers the saw blade 2 of the bevel saw, and its right end is connected to the front inner wall of the bevel saw's blade cover; the rear protective cover 3 and the blade cover together form an upper dust suction channel, used to absorb most of the dust and debris brought out by the saw blade 2 during high-speed rotating cutting; wherein,

[0050] During the cutting process, the rear protective cover 3 is always in contact with the wood and is lifted up by the wood, rotating upward around the connection point, with its upper left corner always close to the inner wall of the blade cover.

[0051] like Figure 1-2 As shown, the rear protective cover 3 includes: a front section of the rear protective cover, an arc-shaped transition connecting section, and a rear section of the rear protective cover; wherein,

[0052] The outermost part of the front section of the rear protective cover has an arc-shaped groove for covering the saw blade 2;

[0053] The arc-shaped transition section forms a protrusion to cover the protruding saw blade locking screw 32;

[0054] The rear section of the rear protective cover is rotatably connected to the front inner wall of the blade cover.

[0055] The rear protective cover has a limiting opening 25 at its front section. The upper left corner of the rear protective cover is confined within the blade cover using a positioning screw through the limiting opening 25. One end of the positioning screw passes through the limiting opening 25 and is fixed to the inner wall of the blade cover. The top plate of the front section of the rear protective cover is arc-shaped, and its two side plates are fan-shaped, forming an arc-shaped groove. The arc-shaped transition connecting section of the rear protective cover 3 has an obtuse angle, and its position corresponds to the position of the saw blade locking screw 32. The depth of the arc-shaped transition connecting section is greater than the distance by which the saw blade locking screw protrudes from the saw blade 2; the width of the arc-shaped transition connecting section is greater than the diameter of the saw blade locking screw 32.

[0056] The rear section of the rear protective cover is triangular near the connection point, which is used to avoid the wood when the rear protective cover 3 falls naturally.

[0057] The front section of the rear protective cover is also provided with a rear protective cover roller 4 at the position where it fits against the wood.

[0058] like Figure 12-13 As shown, during the process of the rear protective cover 3 being lifted by the wood, the outermost outer wall of the front section of the rear protective cover, in the pushing and cutting state, fits against the cutting object from top to bottom; wherein, the tangent line at the contact point between the rear protective cover and the wood always maintains an angle of 40-45 degrees with the upper surface of the wood.

[0059] During the push-cutting process, the wood pushes the rear protective cover 3 upwards through the outermost part of the front section of the rear protective cover, and then the lower left corner of the rear protective cover 3 rests against the wood. During the pull-cutting process, the wood pushes the rear protective cover 3 upwards through the lower side of the rear protective cover 3, and then the lower left corner of the rear protective cover 3 rests against the wood. The upper left corner of the front section of the rear protective cover is always close to the inner wall of the blade cover. This unique design allows the rear protective cover to be pushed and pulled freely, while also allowing dust and debris to be better guided along the internal arc of the rear protective cover into the suction port. Figure 3-5 As shown, the oblique cutting saw includes: a base, a disc mounted on the base, and a sawing structure disposed above the disc; wherein,

[0060] The sawing mechanism includes: a saw blade, a blade cover disposed above the saw blade, and an upper dust suction channel;

[0061] The bevel saw also includes a lower dust suction channel, which is located at the rear of the disc. One end of the lower dust suction channel is connected to the disc, and the other end of the lower dust suction channel is connected to the self-dust suction device of the bevel saw through a pipe. The lower dust suction channel includes a dust outlet assembly.

[0062] The dust outlet assembly includes an upper channel and a lower channel, wherein,

[0063] The upper channel has a curved groove structure to collect dust and debris from above the disc platform;

[0064] The lower channel is connected to the cavity below the disc cutter plate, and is used to collect dust and debris from below the cutter plate.

[0065] like Figure 1-13 As shown, the oblique cutter saw equipped with a rear protective cover specifically includes: left blade cover 1, saw blade 2, rear protective cover 3, protective cover roller 4, dust collection cover 5, right blade cover 6, volute A 7, volute B 8, wind deflector A 9, wind deflector B 10, armature assembly 11, stator 12, housing 13, housing rear cover 14, dust outlet elbow 15, dust outlet assembly 16, cutting plate 17, lower dust collection hose 18, protective cover 19, disc 20, base 21, dust outlet hose 22, dust collection bag 23, rear protective cover connecting opening 24, limiting opening 25, upper channel 26, lower channel 27, guide rib plate 28, dust collection port 29, 30, dust collection chamber 31, wood 32, saw blade locking screw 33, outer pressure plate 34, inner pressure plate 35, output shaft and 36 protective cover fixing plate.

[0066] The bevel saw also includes a lower dust extraction channel, such as... Figure 6-8 As shown, the lower suction channel is a dual-channel design. The lower suction channel is located at the rear of the disc. One end of the lower suction channel is connected to the disc 20, and the other end of the lower suction channel is connected to the self-cleaning device of the bevel saw through a pipe. The lower suction channel includes a dust outlet assembly 16 and a dust outlet elbow 15. The pipe is a lower suction outlet hose 18. One end of the dust outlet elbow 15 is connected to the dust outlet assembly 16, and the other end of the dust outlet elbow 15 is connected to the suction port 29 inside the bevel saw blade cover through the lower suction outlet hose 18. That is, the other end of the dust outlet assembly 16 is connected to the dust suction chamber 30 formed by the dust suction cover plate 5 and the dust guide rib plate 28 inside the blade cover through the dust outlet elbow 15 and the lower dust suction hose 18; the dust outlet assembly 16 includes an upper channel 26 and a lower channel 27, wherein the upper channel 26 has an arc groove structure and is an open design, similar to a slide, for absorbing dust above the disc table; the lower channel 27 communicates with the cavity below the disc cutting plate 17 and is used to absorb dust below the cutting plate 17.

[0067] The blade cover is equipped with a dust guide rib plate 28 and a dust collection cover plate 5, such as Figure 10-11 As shown, the dust guide rib 28 closes to form a dust suction chamber 30, which is connected to a self-cleaning device via a dust suction port 29. One side of the blade cover (right blade cover) is connected to the self-cleaning device to collect all dust generated by the saw blade cutting material.

[0068] The bevel saw also includes a dust collection bag 23, which is connected to a self-cleaning device in the motor via a dust outlet hose 22. The bevel saw also includes a self-cleaning device, which is a single-blade design. Specifically, the self-cleaning structure of the single-blade motor is as follows... Figure 4 and Figure 9 As shown, the components in sequence include: left blade cover 1, saw blade 2, rear protective cover 3, dust collection cover 5, right blade cover 6, volute housing A 7, volute housing B 8, wind deflector A 9, wind deflector B 10, armature assembly 11, stator 12, housing 13, and rear cover of housing 14.

[0069] The specific working process of this invention is as follows: Figure 12-13 As shown, when cutting wood, the rear protective cover 3 always remains on the wood and is naturally lifted by the wood, rotating upwards around the connection with the blade cover; most of the wood chips generated during high-speed rotation cutting follow the rotation of the saw blade through the rear protective cover 3 along the arc into the inside of the blade cover, and finally enter the dust suction chamber closed by the dust suction cover 5 and the dust guide rib plate 28.

[0070] During cutting, a small portion of the dust particles above the disc and towards the rear of the wood block enters the upper channel 26 of the dust outlet assembly 16, while another small portion of the dust particles below the cutting plate 17 enters the lower channel 27 of the dust outlet assembly 16. Then, the wood particles from both channels of the dust outlet assembly 16 enter the dust outlet elbow 15, then the lower suction hose 18, and finally the suction chamber 30 inside the blade cover, which is sealed by the suction cover plate 5 and the dust guide rib plate 28.

[0071] Most of the wood chips generated during the high-speed rotary cutting, along with a small portion of the dust generated above the disc and below the cutting plate, are collected in the suction chamber 30. All the collected dust then enters the suction port 29, passes through the self-suction device assembly, enters the dust outlet hose 22, and then goes to the dust collection bag 23, ultimately achieving the purpose of dust collection.

[0072] This invention features a dual-channel dust extraction design at the rear of the saw blade and a unique dust extraction design on the rear protective cover above the rear saw blade. Through a vacuum dust extraction channel inside the blade cover, the dust extraction effect is maximized. The rear protective cover provided by this invention is installed on the blade cover and rotates at the connection point. When cutting wood, whether pushing or pulling, the rear protective cover will naturally rotate upwards along the connection point. The tangent line at the contact point between the rear protective cover and the wood always maintains a 40-45 degree angle with the upper surface of the wood.

[0073] In push-cut mode, the saw blade smoothly pushes the wood up, and in pull-cut mode, the lower side of the rear guard remains in contact with the wood to ensure optimal dust collection. The unique design of the saw blade's rear guard allows for free movement during both pushing and pulling, while dust and debris above the wood during cutting enter the frame's suction channel through the rear guard. This multi-modal cutting method makes cutting more convenient and faster.

[0074] All aspects not described in detail in this invention can be covered using conventional technical knowledge in the field.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated rear guard shield for a self- dusting dust-free miter saw, comprising: The rear protective cover (3) is wrapped around the saw blade (2) of the miter saw at the left end, and is connected with the front inner wall of the cutter cover of the miter saw at the right end; the rear protective cover (3) and the cutter cover form an upper dust suction channel together, which is used for absorbing most of the dust brought out by the saw blade (2) during high-speed rotation cutting; wherein, During the cutting process, the rear protective cover (3) is always in contact with the wood, whether it is pushed or pulled, and the rear protective cover can be freely lifted by the wood around the connection point; The rear protective cover (3) comprises a rear protective cover front section, an arc-shaped transition connection section and a rear protective cover rear section; wherein, The outermost side of the rear protective cover front section is a circular arc-shaped groove for wrapping the saw blade (2); The arc-shaped transition connection section forms a protruding part for wrapping the protruding saw blade locking screw (32); The rear protective cover rear section is rotatably connected with the front inner wall of the cutter cover; The rear protective cover front section is provided with a limiting opening (25), and the rear protective cover is limited to the cutter cover by the limiting opening (25) through a positioning screw, wherein one end of the positioning screw passes through the limiting opening (25) and is fixed with the inner wall of the cutter cover.

2. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, The miter saw comprises a base, a disc mounted on the base and a sawing mechanism arranged above the disc; wherein, The sawing mechanism comprises a saw blade, a cutter cover arranged above the saw blade and an upper dust suction channel; The miter saw also comprises a lower dust suction channel, which is arranged at the rear of the disc, one end of the lower dust suction channel is connected with the disc, and the other end of the lower dust suction channel is connected with the self-dust suction device of the miter saw through a pipeline; the lower dust suction channel comprises a dust outlet assembly; The dust outlet assembly comprises an upper channel and a lower channel, wherein, The upper channel has an arc-shaped groove structure for absorbing dust above the disc surface; The lower channel is communicated with the cavity below the disc kerf plate, and is used for absorbing dust below the kerf plate.

3. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, The top plate of the rear protective cover front section is circular arc-shaped, and the two side plates are fan-shaped, which together form a circular arc-shaped groove.

4. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, The arc-shaped transition connection section of the rear protective cover (3) is an obtuse angle, which corresponds to the position of the saw blade locking screw (32); wherein, the depth of the arc-shaped transition connection section is greater than the distance of the saw blade (2) locking screw protruding from the saw blade (2); the width of the arc-shaped transition connection section is greater than the diameter of the saw blade locking screw (32).

5. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, The rear protective cover rear section is triangular near the connection point, which is used to avoid the wood when the rear protective cover (3) naturally falls.

6. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, The rear protective cover front section is also provided with a rear protective cover roller (4) at the position in contact with the wood.

7. The one-piece rear guard for a self-cleaning dust-free miter saw of claim 1, wherein, During the process of the rear protective cover (3) being lifted by the wood, the outermost side of the rear protective cover front section is in contact with the cutting object from top to bottom in the pushed state; wherein, the tangent line at the contact position of the rear protective cover and the wood always maintains an angle of 40-45 degrees with the upper surface of the wood.

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