Quick-change structure of an angle grinder protective cover

Abstract

The application provides a quick-change structure of a protective cover of an angle grinder, which comprises a handle, a transmission shaft rotatably installed at the end of the handle, an angle grinding disc detachably connected to the end of the transmission shaft, and a protective cover covering the outside of the angle grinding disc, wherein the inside of the protective cover is connected with a limiting ring, the end of the handle is connected with a shell, the shell is provided with a ring groove in the circumferential direction, and a plurality of clamping holes are formed on the side of the ring groove close to the protective cover, and the inside of the limiting ring is provided with a plurality of clamping blocks matched with the clamping holes, so that when the limiting ring is installed on the shell, the clamping blocks are inserted into the clamping holes and are limited and matched with the ring groove by the clamping blocks; the application improves the convenience of disassembling the protective cover and does not affect the cutting depth of the angle grinding disc.

Description

Technical Field

[0001] This invention relates to the field of angle grinders, and in particular to a quick-change structure for an angle grinder protective cover. Background Technology

[0002] An angle grinder, also known as a grinding machine or disc grinder, is a handheld electric abrasive tool used for cutting and polishing, mainly for cutting, grinding, and brushing metals and stone.

[0003] When using an angle grinder, it is necessary to install an angle grinding disc for cutting and grinding. Since sparks are generated during the processing of the angle grinding disc, current angle grinders are usually equipped with a protective cover to prevent sparks from flying.

[0004] However, the existing protective cover installation method basically uses trigger fixing, which has the disadvantage that the trigger will affect the cutting depth of the angle grinder, making it difficult for the angle grinder to perform deep cutting processing. In addition, the trigger fixing method is difficult to disassemble, which makes the replacement of the existing protective cover inconvenient. Summary of the Invention

[0005] The purpose of this invention is to provide a quick-change structure for the protective cover of an angle grinder that improves the ease of disassembly of the protective cover without affecting the cutting depth of the angle grinder disc.

[0006] To solve the above-mentioned technical problems, the present invention provides a quick-change structure for an angle grinder protective cover, including a handle, a drive shaft rotatably mounted on the end of the handle, an angle grinding disc detachably connected to the end of the drive shaft, and a protective cover covering the outside of the angle grinding disc. A limiting ring is connected to the inner side of the protective cover, and a housing is connected to the end of the handle. The housing has an annular groove along its circumference, and a plurality of slots are formed on the side of the annular groove near the protective cover. The inner side of the limiting ring has a plurality of locking blocks that match the slots, so that when the limiting ring is installed at the housing, the locking blocks are inserted into the slots and the locking blocks and the annular groove are engaged for limiting.

[0007] Furthermore, a lever is rotatably provided on the side of the housing, and the end of the lever has a positioning flange. The side of the limiting ring is provided with a plurality of positioning holes spaced apart circumferentially, so that the positioning flange is fastened in one of the positioning holes.

[0008] Furthermore, a rotating shaft is connected between the lever and the housing, a reset component is sleeved on the rotating shaft, and a lever has a paddle at the end away from the positioning flange.

[0009] Furthermore, the bayonet includes a first bayonet and a second bayonet, the opening width of the first bayonet is greater than the opening width of the second bayonet, and the card block includes a first card block and a second card block, the first card block matching the first bayonet and the second card block matching the second bayonet.

[0010] Furthermore, a fixing block is fixedly provided at the end of the drive shaft, and a fastener is threadedly provided at the end of the drive shaft. An angle grinding disc is located between the fixing block and the fastener. Several adjusting grooves are provided circumferentially inside the fixing block. The adjusting block is movably installed in the adjusting grooves. A through groove is provided on one side of the adjusting groove. A variable diameter rod is connected to the side of the adjusting block near the through groove so that when the adjusting block moves relative to the adjusting groove, the variable diameter rod moves along the through groove.

[0011] Furthermore, a drive groove is provided at one end of the adjustment groove, and the drive block is movably installed in the drive groove. The drive block and the adjustment block are wedge-shaped, so that when the drive block moves along the drive groove, the adjustment block moves along the adjustment groove. A first elastic element is connected between one end of the drive block and the drive groove, and a second elastic element is connected between one end of the adjustment block and the adjustment groove.

[0012] Furthermore, a tightening ring is threadedly fitted at the end of the transmission shaft. The tightening ring is located on the side of the fastener away from the fixed block, and a connecting ring is rotatably provided on the side of the tightening ring close to the fastener. Several tightening rods matching the driving block are provided on the side of the connecting ring close to the driving block, so that when the tightening ring rotates along the transmission shaft, the tightening rods drive the driving block to move.

[0013] Furthermore, the drive block has a guide hole on the side near the clamping rod, and the fastener has several arc grooves along the circumference so that the clamping rod passes through the arc grooves and is inserted into the guide hole, and the width of the arc groove is greater than the outer diameter of the clamping rod.

[0014] Furthermore, the end of the variable diameter rod is detachably connected to a sleeve so that the inner ring of the angle grinding disc abuts against the sleeve.

[0015] Furthermore, the protective cover includes an inner cover and an outer cover. The connection between the inner cover and the outer cover is a stepped structure, and a retaining plate is connected to the side of the outer cover near the inner cover. A buckle matching the retaining plate is provided on the side of the inner cover near the outer cover, so that when the outer cover and the inner cover are connected, the retaining plate is fastened in the buckle. A pressing groove is provided on the side of the buckle, and the pressing groove corresponds to the end of the retaining plate.

[0016] The beneficial effects of this invention are as follows: When installing the protective cover, the limiting ring is aligned with the outer periphery of the shell and fitted, and several locking blocks are inserted one by one with several locking slots, so that several locking blocks are engaged in the ring groove. Then, the protective cover is controlled to rotate along the shell, so that the limiting ring drives several locking blocks to rotate along the ring groove, thereby making the locking blocks and locking slots interlock, so that the ring groove limits the locking blocks, thus quickly completing the installation of the protective cover. Moreover, since the locking blocks, buckles and other structures are all located at the position of the limiting ring, the connection structure of the protective cover will not affect the grinding depth of the angle grinding disc, thereby improving the cutting efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the connection between the fixing block and the fastener in this invention.

[0019] Figure 3 This is a side view of the fastener in this invention.

[0020] Figure 4 This is the present invention. Figure 3 Cross-sectional view along line AA.

[0021] Figure 5 This is the present invention. Figure 4 A magnified view of a portion of point A in the middle.

[0022] Figure 6 This is a schematic diagram showing the connection between the inner cover and the outer cover of the present invention.

[0023] Figure 7 This is an exploded view of the inner and outer covers of the present invention.

[0024] Figure 8 This is a half-sectional view of the present invention.

[0025] Figure 9 This is the present invention. Figure 8 A magnified view of a section at point B in the middle.

[0026] Figure 10 This is a schematic diagram of the assembly of the bayonet and the card block in this invention.

[0027] Reference numerals: 1. Handle; 2. Drive shaft; 4. Protective cover; 41. Inner cover; 42. Outer cover; 43. Clamping plate; 44. Buckle; 45. Pressing groove; 5. Limiting ring; 6. Housing; 7. Ring groove; 8. Bayonet; 9. Clamping block; 10. Lever; 11. Positioning flange; 12. Positioning port; 13. Rotating shaft; 14. Reset component; 15. Paddle; 16. Fixing block; 17. Fastener; 18. Adjusting groove; 19. Adjusting block; 20. Through groove; 21. Variable diameter rod; 22. Drive groove; 23. Drive block; 24. First elastic element; 25. Second elastic element; 26. Tightening ring; 27. Connecting ring; 28. Tightening rod; 29. ​​Guide hole; 30. Arc groove; 31. Sleeve. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0029] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0030] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0031] like Figures 1-10 The present invention provides a quick-change structure for an angle grinder protective cover, including a handle 1, a drive shaft 2 rotatably mounted on the end of the handle 1, an angle grinding disc detachably connected to the end of the drive shaft 2, and a protective cover 4 covering the outside of the angle grinding disc. A limiting ring 5 is connected to the inner side of the protective cover 4. A housing 6 is connected to the end of the handle 1. The housing 6 has an annular groove 7 along its circumference, and a plurality of slots 8 are provided on the side of the annular groove 7 near the protective cover 4. The inner side of the limiting ring 5 has a plurality of locking blocks 9 that match the slots 8, so that when the limiting ring 5 is installed at the housing 6, the locking blocks 9 are inserted into the slots 8, and the locking blocks 9 and the annular groove 7 are engaged for limiting.

[0032] When installing the protective cover 4, the limiting ring 5 is aligned with the outer periphery of the housing 6 and fitted, and several locking blocks 9 are inserted one by one with several locking slots 8, so that several locking blocks 9 are engaged in the annular groove 7. Then, the protective cover 4 is controlled to rotate along the housing 6, so that the limiting ring 5 drives several locking blocks 9 to rotate along the annular groove 7, thereby making the locking blocks 9 and locking slots 8 interlock, so that the annular groove 7 limits the locking blocks 9. The installation of the protective cover 4 can be completed quickly. Since the locking blocks 9, buckles 44 and other structures are all located at the position of the limiting ring 5, the connection structure of the protective cover 4 will not affect the grinding depth of the angle grinding disc, thus improving the cutting efficiency.

[0033] The drive shaft 2 is controlled by a motor to rotate, so that after the angle grinding disc is installed at the end of the drive shaft 2, the drive shaft 2 drives the angle grinding disc to rotate; the protective cover 4 has a protection angle of 180°, so that when the protective cover 4 blocks the sparks from the angle grinding disc, it will not interfere with the processing direction of the angle grinding disc.

[0034] In one embodiment of this solution, the bayonet 8 includes a first bayonet and a second bayonet, the opening width of the first bayonet is greater than the opening width of the second bayonet, and the card block 9 includes a first card block and a second card block, the first card block is matched with the first bayonet, and the second card block is matched with the second bayonet.

[0035] Specifically, the first and second locking blocks are adapted by first and second locking slots with different opening widths, so that after the locking block 9 passes through the locking slot 8, the limiting ring 5 rotates circumferentially, thereby preventing the first locking block from disengaging from the second locking slot, thus ensuring the stable connection of the protective cover 4 when it rotates with the limiting ring 5.

[0036] In this scheme, a first locking slot, two second locking slots, a first locking block, and two second locking blocks are preferably provided, so that the limiting ring 5 and the housing 6 can be limited at three points, thereby improving the installation stability of the limiting ring 5.

[0037] Preferably, the housing 6 is rotatably provided with a lever 10, the end of the lever 10 having a positioning flange 11, and the side of the limiting ring 5 is provided with a plurality of positioning holes 12 spaced apart along the circumference, so that the positioning flange 11 is fastened in one of the positioning holes 12.

[0038] Specifically, after the protective cover 4 is rotated to a suitable angle, the positioning flange 11 is fastened to the corresponding positioning port 12, so that the lever 10 can position the limiting ring 5, thereby limiting the radial direction of the protective cover 4 by the ring groove 7 and the circumferential direction by the positioning flange 11, thus increasing the overall stability of the protective cover 4; and since multiple positioning ports 12 are opened on the side of the limiting ring 5, the protection angle of the protective cover 4 can be adjusted at multiple angles.

[0039] Preferably, a rotating shaft 13 is connected between the lever 10 and the housing 6, a reset member 14 is sleeved on the rotating shaft 13, and the end of the lever 10 away from the positioning flange 11 has a lever piece 15.

[0040] Specifically, the rotating shaft 13 ensures the stable rotation of the lever 10, while the reset component 14 resets the lever 10 to ensure that the positioning flange 11 can be stably engaged in the positioning port 12. The setting of the lever 15 can assist the user in pushing the lever 10 away from the limit ring 5, so as to facilitate the removal or installation of the protective cover 4.

[0041] The reset component 14 adopts a torsion spring structure.

[0042] Preferably, a fixing block 16 is fixedly provided at the end of the transmission shaft 2, and a fastener 17 is threadedly provided at the end of the transmission shaft 2. An angle grinding disc is located between the fixing block 16 and the fastener 17. A plurality of adjusting grooves 18 are provided circumferentially inside the fixing block 16. An adjusting block 19 is movably installed in the adjusting groove 18. A through groove 20 is provided on one side of the adjusting groove 18. A variable diameter rod 21 is connected to the side of the adjusting block 19 near the through groove 20 so that when the adjusting block 19 moves relative to the adjusting groove 18, the variable diameter rod 21 moves along the through groove 20.

[0043] Specifically, when installing the angle grinder, the inner hole of the angle grinder is fitted onto the end of the drive shaft 2, and then one side of the angle grinder is pressed against the fixing block 16, so that the fastener 17 rotates along the drive shaft 2 and clamps and fixes the other side of the angle grinder.

[0044] Meanwhile, since angle grinding discs of different sizes have different inner hole dimensions, in order to ensure compatibility with the inner holes of various angle grinding discs, this solution is equipped with a variable diameter rod 21. After the angle grinding disc is placed on one side of the fixed block 16, the variable diameter rod 21 is moved along the through groove 20 by moving the adjusting block 19. This allows several variable diameter rods 21 to simultaneously abut against the inner hole of the angle grinding disc, ensuring the supporting effect of several variable diameter rods 21 on the inner hole of the angle grinding disc and improving the compatibility with the inner holes of different angle grinding discs. Then, the fastener 17 is tightened to limit the two sides of the angle grinding disc to ensure the stability of the center position of the angle grinding disc.

[0045] The through groove 20 is opened radially along the transmission shaft 2 to ensure that the variable diameter rod 21 moves radially along the transmission shaft 2, thereby stably adapting to the inner hole of the angle grinding disc.

[0046] Preferably, one end of the adjusting groove 18 is provided with a driving groove 22, and the driving block 23 is movably installed in the driving groove 22. The driving block 23 and the adjusting block 19 are wedge-fitted so that when the driving block 23 moves along the driving groove 22, the adjusting block 19 moves along the adjusting groove 18. One end of the driving block 23 is connected to the driving groove 22 with a first elastic element 24, and one end of the adjusting block 19 is connected to the adjusting groove 18 with a second elastic element 25.

[0047] Specifically, through the wedge engagement between the drive block 23 and the adjusting block 19, when the drive block 23 moves along the drive groove 22, the adjusting block 19 can be moved by the drive block 23 to ensure the stable use of the variable diameter rod 21. At the same time, the first elastic element 24 and the second elastic element 25 respectively reset and adjust the drive block 23 and the adjusting block 19 to ensure the subsequent reset stability of the variable diameter rod 21.

[0048] The first elastic element 24 and the second elastic element 25 can be spring structures.

[0049] Preferably, a tightening ring 26 is threadedly fitted at the end of the transmission shaft 2. The tightening ring 26 is located on the side of the fastener 17 away from the fixing block 16, and a connecting ring 27 is rotatably provided on the side of the tightening ring 26 near the fastener 17. A plurality of tightening rods 28 matching the driving block 23 are provided on the side of the connecting ring 27 near the driving block 23, so that when the tightening ring 26 rotates along the transmission shaft 2, the tightening rods 28 drive the driving block 23 to move.

[0050] Specifically, after placing the angle grinding disc between the fixing block 16 and the fastener 17, the angle grinding disc is initially positioned by the fastener 17. At this time, the fastener 17 is not tightened, allowing the angle grinding disc to be adjusted to a certain extent along the radial direction of the drive shaft 2. Then, several clamping rods 28 are inserted one by one to align with the position of the drive block 23 until the end of the clamping rod 28 abuts against the drive block 23. Subsequently, the clamping ring 26, through its threaded engagement with the drive shaft 2, causes the clamping ring 26 to drive the connecting rod to move towards the fastener 17. By pushing the drive block 23 through the clamping rod 28, the variable diameter rod 21 moves to adapt to the inner hole size of the angle grinding disc. Due to the connection between the clamping ring 26 and the connecting ring 27, the clamping ring 26 will not drive the connecting ring 27 to rotate when it rotates, thus ensuring the stability of the axial movement of the clamping rod 28.

[0051] Preferably, the drive block 23 has a guide hole 29 on the side near the tightening rod 28, and the fastener 17 has a plurality of arc grooves 30 along the circumference so that the tightening rod 28 passes through the arc grooves 30 and is inserted into the guide hole 29, and the width of the arc grooves 30 is greater than the outer diameter of the tightening rod 28.

[0052] Specifically, the end of the clamping rod 28 is guided and limited by the guide hole 29 to improve the pushing effect of the clamping rod 28 on the drive block 23. At the same time, due to the setting of several arc grooves 30, when the clamping rod 28 pushes the drive block 23, the radial direction of the angle grinding plate is limited. Since the fastener 17 has not yet fully clamped the side of the angle grinding plate at this time, the fastener 17 still needs to be tightened. However, due to the setting of the arc grooves 30, the clamping rod 28 is within the range of the arc grooves 30 during the tightening process of the fastener 17. Therefore, the rotation of the fastener 17 will not affect the clamping rod 28, but will only cause the clamping rod 28 to be relatively displaced with the arc grooves 30.

[0053] Preferably, the end of the variable diameter rod 21 is detachably connected to a sleeve 31 so that the inner ring of the angle grinding disc abuts against the sleeve 31.

[0054] Specifically, the sleeve 31 protects the outer circumference of the reducing rod 21, preventing wear and tear that could lead to instability in its operation. Furthermore, since the sleeve 31 is detachable, it can be replaced periodically to ensure the service life of the reducing rod 21.

[0055] Preferably, the protective cover 4 includes an inner cover 41 and an outer cover 42. The connection between the inner cover 41 and the outer cover 42 is a stepped structure. A retaining plate 43 is connected to the side of the outer cover 42 near the inner cover 41. A buckle 44 matching the retaining plate 43 is provided on the side of the inner cover 41 near the outer cover 42, so that when the outer cover 42 is connected to the inner cover 41, the retaining plate 43 is fastened in the buckle 44. A pressing groove 45 is provided on the side of the buckle 44, and the pressing groove 45 corresponds to the end of the retaining plate 43.

[0056] Specifically, the inner hole size of the angle grinding discs varies, and the outer diameter of the angle grinding discs also comes in various specifications. In order to ensure that the protective cover can be adapted to angle grinding discs with different outer diameters, so as to avoid the problem that the protective cover 4 is too large and affects the cutting, or that the protective cover 4 is too small and causes sparks to fly, this solution sets up an inner cover 41 and an outer cover 42. First, the inner cover 41 is fixed to the angle grinder by the limiting ring 5. Then, the user selects the appropriate size of the outer cover 42 according to the required outer diameter of the angle grinding disc, and aligns the clamping plate 43 of the outer cover 42 with the buckle 44 to snap it in place. Since the connection between the inner cover 41 and the outer cover 42 is a stepped structure, after the outer cover 42 is snapped in place, its two sides are limited by the stepped structure and the buckle 44 respectively, so as to ensure the stability of the protective cover 4 in use.

[0057] Meanwhile, due to the setting of the pressing groove 45, when disassembling the outer cover 42, the locking plate 43 at the pressing groove 45 can be pushed to make the locking plate 43 more easily disengage from the position of the buckle 44, thereby facilitating the replacement of the outer cover 42.

[0058] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A quick-change structure for an angle grinder protective cover, characterized in that: The device includes a handle (1), a drive shaft (2) rotatably mounted on the end of the handle (1), a grinding disc detachably connected to the end of the drive shaft (2), and a protective cover (4) covering the outside of the grinding disc. A limiting ring (5) is connected to the inner side of the protective cover (4). A housing (6) is connected to the end of the handle (1). The housing (6) has a circumferential groove (7), and several slots (8) are provided on the side of the groove (7) near the protective cover (4). The inner side of the limiting ring (5) has a... A number of locking blocks (9) are matched with the bayonet (8) so that when the limiting ring (5) is installed at the housing (6), the locking blocks (9) are inserted into the bayonet (8) and the locking blocks (9) and the ring groove (7) are used for limiting cooperation; the housing (6) is rotatably provided with a lever (10) on the side, and the end of the lever (10) has a positioning flange (11); the side of the limiting ring (5) is provided with a number of positioning holes (12) spaced apart along the circumference so that the positioning flange (11) is fastened in one of the positioning holes (12); A fixing block (16) is fixed at the end of the drive shaft (2), and a fastener (17) is threadedly fitted at the end of the drive shaft (2). An angle grinding disc is located between the fixing block (16) and the fastener (17). Several adjustment grooves (18) are opened circumferentially inside the fixing block (16). An adjustment block (19) is movably installed in the adjustment groove (18). A through groove (20) is opened on one side of the adjustment groove (18). A variable diameter rod (21) is connected to the side of the adjustment block (19) near the through groove (20) so that when the adjustment block (19) moves relative to the adjustment groove (18), the variable diameter rod (21) moves along the through groove (20). The adjustment groove (18) has a drive groove (22) at one end. The drive block (23) is movably installed in the drive groove (22), and the drive block (23) and the adjustment block (19) are wedge-fitted so that when the drive block (23) moves along the drive groove (22), the adjustment block (19) moves along the adjustment groove (18). A first elastic element (24) is connected between one end of the drive block (23) and the drive groove (22), and a second elastic element (25) is connected between one end of the adjustment block (19) and the adjustment groove (18). The drive shaft (2) is threadedly fitted with a tightening ring (26) at its end. The tightening ring (26) is located on the side of the fastener (17) away from the fixing block (16). A connecting ring (27) is rotatably provided on the side of the tightening ring (26) close to the fastener (17). A plurality of tightening rods (28) matching the driving block (23) are provided on the side of the connecting ring (27) close to the driving block (23), so that when the tightening ring (26) rotates along the drive shaft (2), the tightening rods (28) drive the driving block (23) to move.

2. The quick-change structure for the angle grinder protective cover according to claim 1, characterized in that: A rotating shaft (13) is connected between the lever (10) and the housing (6). A reset member (14) is sleeved on the rotating shaft (13), and a lever (15) is provided at the end of the lever (10) away from the positioning flange (11).

3. The quick-change structure for the angle grinder protective cover according to claim 1, characterized in that: The bayonet (8) includes a first bayonet and a second bayonet, the opening width of the first bayonet is greater than the opening width of the second bayonet, and the card block (9) includes a first card block and a second card block, the first card block is matched with the first bayonet, and the second card block is matched with the second bayonet.

4. The quick-change structure for the angle grinder protective cover according to claim 1, characterized in that: The drive block (23) has a guide hole (29) on the side near the tightening rod (28), and the fastener (17) has several arc grooves (30) along the circumference so that the tightening rod (28) passes through the arc grooves (30) and is inserted into the guide hole (29), and the width of the arc grooves (30) is greater than the outer diameter of the tightening rod (28).

5. The quick-change structure for the angle grinder protective cover according to claim 1, characterized in that: The end of the variable diameter rod (21) is detachably connected to a sleeve (31) so that the inner ring of the angle grinding disc abuts against the sleeve (31).

6. The quick-change structure for the angle grinder protective cover according to claim 1, characterized in that: The protective cover (4) includes an inner cover (41) and an outer cover (42). The connection between the inner cover (41) and the outer cover (42) is a stepped structure. A retaining plate (43) is connected to the side of the outer cover (42) near the inner cover (41). A buckle (44) matching the retaining plate (43) is provided on the side of the inner cover (41) near the outer cover (42) so that when the outer cover (42) is connected to the inner cover (41), the retaining plate (43) is fastened in the buckle (44). A pressing groove (45) is provided on the side of the buckle (44), and the pressing groove (45) corresponds to the end of the retaining plate (43).

Images