Angle grinder accessory

Abstract

The invention provides an angle grinder accessory which is stable in structure, easy to install, safe and reliable, and belongs to the technical field of electric tools. The accessories comprise a bearing box, a scraper knife mounting sleeve, an ejector rod, an eccentric driving wheel, a ball bearing, an adaptive connecting piece and a scraper knife. The bearing box and the adaptive connecting piece can be quickly and stably connected through the first C-shaped connecting body and the second C-shaped connecting body; and the adaptive connecting piece can be quickly mounted on the shaft neck part of the angle grinder through the mounting ring of the adaptive connecting piece. The scraper knife mounting sleeve is arranged in the through hole of the bearing box, and the scraper knife is mounted in the scraper knife positioning sleeve through a positioning structure. The eccentric driving wheel is matched with the ball bearing to drive the ejector rod, and the ejector rod drives the scraper knife to achieve shoveling and chiseling operation. The accessory is suitable for various angle grinders of different models and can be rapidly and stably connected with the angle grinders, the scraper knife fixing mode is simple and effective, the eccentric driving assembly has lower abrasion and lower noise, and the accessory has lower manufacturing cost and longer service life.

Description

Technical Field

[0001] The invention relates to an angle grinder accessory, in particular to a chiseling and shovel-type accessory for an angle grinder, which is used for being attached to the angle grinder to realize chiseling and shovel cutting operations. Background Art

[0002] Angle grinder, as a widely used power tool, plays an important role in many fields such as metal processing and wood processing with its powerful rotational power. In order to expand the function of angle grinder, chisel shovel as an accessory came into being, which can convert the rotational power of angle grinder into impact force to realize the function of chiseling or shoveling.

[0003] In the prior art, the design of the chisel shovel usually includes a connecting mechanism and a driving mechanism. The connecting mechanism is used to be connected to the output shaft of the angle grinder, and the driving mechanism is used to drive the chisel shovel to move.

[0004] Although these chisel shovel accessories have met the needs of users to a certain extent, there is still room for some technical improvements, such as compatibility between accessories and different models of angle grinder hosts, quick installation, ease of use, low vibration, durability, operational safety, etc. Market users expect the emergence of chisel shovel accessories that are more efficient, safe, easy to use, and more durable. Summary of the invention

[0005] The present invention is directed to the above-mentioned chiseling and shoveling accessories, and aims to provide an angle grinder accessory device for chiseling operations which has a more stable structure, low vibration, low wear, is easy to install and can ensure safe operation.

[0006] To this end, the technical solution of the present invention is: An angle grinder attachment, comprising: A carrying box, wherein the carrying box has a first through hole extending from front to back; A blade mounting sleeve, wherein the blade mounting sleeve is at least partially located in the first through hole, and the blade mounting sleeve has a second through hole extending from front to back; a push rod, wherein at least a portion of the push rod is located in the second through hole; An eccentric drive wheel, wherein the eccentric drive wheel has an outer cylindrical surface; A ball bearing, wherein the inner ring of the ball bearing is fixedly connected to the outer cylindrical surface of the eccentric drive wheel; Adapting connectors; A shovel blade, wherein the shovel blade has a shovel handle, and the shovel handle can be inserted into the second through hole; The carrying box is an integrally formed part, which has a carrying body and a first C-shaped connecting body. The carrying body is also provided with a first positioning column and a second positioning column. The first C-shaped connecting body is provided with a plurality of first threaded connection holes. A first threaded fastener is provided in the first positioning column. A second threaded fastener, a positioning spring and a steel ball are provided in the second positioning column from top to bottom in sequence. A second positioning pit is provided on the shovel handle; The blade mounting sleeve is also provided with a first positioning pit and a second positioning through groove, the first threaded fastener can be inserted into the first positioning pit, and the steel ball is at least partially located in the second positioning through groove and the second positioning pit; The push rod can move axially and rotate circumferentially in the second through hole; The ball bearing abuts against the push rod with its outer cylindrical surface; The adapter connector comprises a mounting ring and a second C-type connector, the mounting ring is a non-closed ring, and the mounting ring has a first lug and a second lug protruding radially outward at both ends, respectively, and the first lug and the second lug are respectively provided with locking holes; a plurality of second connecting holes are provided on the second C-type connector corresponding to the first threaded connecting holes, the bottom surface of the second C-type connector contacts the top surface of the first C-type connector, and the first bolt passes through the second connecting hole from top to bottom and is screwed into the first threaded connecting hole; the mounting ring can be sleeved on the shaft neck of the angle grinder, the second bolt passes through the locking hole, and the mounting ring is fastened to the shaft neck of the angle grinder by a locking nut and the second bolt; It also includes a cover body, which surrounds the eccentric drive wheel and the ball bearing.

[0007] Furthermore, the carrying box also has a reinforcement portion, and the reinforcement portion includes a side wall and a bottom wall. The carrying body and the first C-shaped connector are reinforced and connected via the side wall and the bottom wall.

[0008] Furthermore, a gasket, a return spring and a clamping ring are also sleeved on the push rod. The gasket can slide on the push rod. The return spring is located between the gasket and the clamping ring. The clamping ring is axially fixedly clamped on the push rod.

[0009] Furthermore, the lower part of the carrier has an arc surface, and a honeycomb is arranged on the arc surface.

[0010] Furthermore, a threaded fixing column is provided on the bottom surface of the first C-shaped connector, and the threaded fixing column is used to install the cover body.

[0011] Furthermore, the carrying box is an aluminum die-casting integrally formed part or a metal powder metallurgy integrally formed part.

[0012] Furthermore, the first through hole is a circular through hole.

[0013] Furthermore, the second through hole is a circular through hole.

[0014] Furthermore, the first positioning column and the second positioning column are arranged along the length direction of the carrier.

[0015] The beneficial effects of the present invention mainly include: 1. The overall structure is reasonably designed and the connections between components are firm, which improves the durability and reliability of the accessories.

[0016] 2. The structural optimization of the bearing box increases its strength, enabling it to withstand higher impact forces during work.

[0017] 3. The fixing method of the shovel blade is simple and effective, ensuring its stability and safety during the working process.

[0018] 4. The eccentric drive assembly uses the radial cylindrical surface of the ball bearing to drive the ejector rod, which can greatly reduce wear and noise.

[0019] 5. The design of the adapter connector allows the accessories to be quickly and firmly removed and installed on the angle grinder, thus improving work efficiency.

[0020] In summary, the angle grinder accessory of the present invention has the advantages of stable structure, easy installation, low vibration and noise, safety and reliability, etc., and is suitable for supporting use with various different models of angle grinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram showing the overall structure of the accessory device of the present invention is shown; Figure 2 A schematic diagram showing the exploded structure of the accessory device of the present invention; Figure 3 A schematic cross-sectional view of an accessory device of the present invention is shown; Figure 4 A schematic diagram showing the connection between the accessory device of the present invention and the angle grinder is shown; Figure 5 A schematic diagram of the blade structure is shown; Figure 6 A schematic diagram of the structure of the blade mounting sleeve is shown; Figure 7 A schematic diagram of the structure of the bearing box is shown; Figure 8 correspond Figure 7 A schematic diagram of the structure of the carrying box from another angle; Fig. 9 A schematic diagram of the structure of the adapter connector is shown; In the figure: 10-carrying box, 20-shovel blade mounting sleeve, 30-thrust rod, 31-gasket, 32-reset spring, 33-retaining ring, 40-eccentric driving wheel, 50-ball bearing, 60-adapting connector, 70-first threaded fastener, 80-second threaded fastener, 90-positioning spring, 100-steel ball, 110-first bolt, 120-second bolt, 130-locking nut, 140-cover, 1401-screw, 200-shovel blade, 201-shovel handle, 202-second positioning pit, 203-shovel blade, 11-carrying body, 12 -first C-type connector, 13-first positioning column, 14-second positioning column, 15-first threaded connection hole, 16-reinforcement portion, 1611-side wall, 1612-bottom wall, 1613-arc surface, 1614-honeycomb, 17-threaded fixing column, 21-first positioning pit, 22-second positioning through groove, h1-first through hole, h2-second through hole, 41-inner cylindrical surface, 42-outer cylindrical surface, 61-mounting ring, 62-second C-type connector, 63-first lug, 64-second lug, 65-locking hole, 66-second connection hole, 67-first bolt, 68-second bolt, 69-locking nut, 700-angle grinder, 701-shaft neck of angle grinder. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figures 1 to 6 As shown, the angle grinder accessory of the present invention mainly includes a carrying box 10, a blade mounting sleeve 20, a push rod 30, an eccentric driving wheel 40, a ball bearing 50, an adapter connector 60, and a blade 200.

[0024] The carrying box 10 has a first through hole h1 extending from front to back, and the blade mounting sleeve 20 is at least partially located in the first through hole h1. The blade mounting sleeve 20 has a second through hole h2 extending from front to back, and the front end of the push rod 30 is located in the second through hole h2, and the rear end extends backward from the blade mounting sleeve 20.

[0025] like Figure 3 , Figure 5 As shown, the front end of the blade mounting sleeve 20 is used to mount the blade 200. The blade 200 has a handle 201, and the handle 201 can be inserted into the second through hole h2.

[0026] The carrying box 10 is designed as an integrally formed part and can be made by aluminum die-casting or metal powder metallurgy. It has a carrying body 11 and a first C-type connector 12. The carrying body 11 is also provided with a first positioning column 13 and a second positioning column 14. The first positioning column 13 and the second positioning column 14 are arranged along the length direction of the carrying body 11. A plurality of first threaded connection holes 15 are provided on the first C-type connector 12. A first threaded fastener 70 is provided in the first positioning column 13. A second threaded fastener 80, a positioning spring 90 and a steel ball 100 are provided in the second positioning column 14 from top to bottom.

[0027] As a preferred embodiment of the present invention, the first through hole h1 is a circular through hole, the blade mounting sleeve 20 is cylindrical, and the blade mounting sleeve 20 has a second through hole h2 inside, and the second through hole h2 is preferably also a circular through hole. The blade mounting sleeve 20 can be inserted and installed into the first through hole h1 more conveniently, and a first positioning pit 21 is provided on the blade mounting sleeve 20. The first threaded fastener 70 is screwed to push it into the first positioning pit 21, thereby preventing the blade mounting sleeve 20 from axial movement and circumferential rotation.

[0028] A second positioning recess 202 is provided on the shovel handle 201. When the shovel handle 201 is inserted into the through hole h2 of the blade mounting sleeve 20, the second threaded fastener 80 can be screwed so that the positioning spring 90 applies a downward pre-tightening force to the steel ball 100, so that part of the steel ball 100 is located in the second positioning recess 202. This arrangement can prevent the blade 200 from loosening from the blade mounting sleeve 20, and can also prevent the blade 200 from freely rotating when the user is working, thereby making the chiseling and shoveling operation safer.

[0029] A push rod 30 is arranged in the rear end portion of the second through hole h2 of the blade mounting sleeve 20. The push rod 30 is preferably designed to have a circular cross section. When it is installed in the second through hole h2, it can move axially and rotate circumferentially. An eccentric drive wheel 40 is arranged behind the push rod 30. As a preferred embodiment of the present invention, the eccentric drive wheel 40 has an inner cylindrical surface 41 and an outer cylindrical surface 42 with different centers. The inner cylindrical surface 41 is provided with a thread, which is used to connect with the corresponding thread on the output shaft of the angle grinder 700. A ball bearing 50 is pressed into the outer cylindrical surface 42, and the inner ring of the ball bearing 50 is fixedly connected to the outer cylindrical surface 42 of the eccentric drive wheel 40. When the output shaft of the angle grinder 700 rotates, the eccentric drive wheel 40 is driven to rotate accordingly, and the eccentric movement between the inner cylindrical surface 41 and the outer cylindrical surface 42 is used to further drive the ball bearing 50 to move. During the movement of the ball bearing 50, the outer cylindrical surface of the ball bearing 50 can be used to support the push rod 30, providing a forward driving force for the push rod 30. The push rod 30 pushes the shovel blade 200 forward by abutting against the rear end of the shovel handle 202, and then the shovel blade 203 can be used to chisel and shovel the wooden workpiece.

[0030] As another alternative embodiment of the present invention, the eccentric drive wheel 40 may not adopt the method of setting a thread on the inner cylindrical surface 41, and the inner cylindrical surface 41 may also adopt other forms such as a non-circular cross-section, such as a polygonal cross-section. In this case, the eccentric drive wheel 40 can be driven to rotate by a corresponding polygonal shaft set on the angle grinder 700.

[0031] As for the backward return movement of the scraper 200, the restoring force can be provided by the reaction force when the scraper blade 203 abuts against the workpiece. In order to further improve the backward return movement, the present invention further includes a gasket 31, a return spring 32, and a retaining ring 33 on the push rod 30. The gasket 31 can slide on the push rod 30, and the return spring 32 is located between the gasket 31 and the retaining ring 33. The retaining ring 33 is axially fixedly clamped on the push rod 30. When the eccentric driving wheel 40 drives the push rod 30 forward, the return spring 32 is compressed. When the eccentric driving wheel 40 is disengaged from the push rod 30 backward, the return spring 30 provides a backward return force for the push rod 30, so that the outer cylindrical surface of the ball bearing 50 can always reliably keep in contact with the push rod 30 during the entire operation.

[0032] refer to Figure 2 and Fig. 9 In order to achieve better adaptation to different types of angle grinders and provide better impact resistance and improve the convenience of connection and disassembly. The adapter connector 60 has a mounting ring 61 and a second C-type connector 62. The mounting ring 61 is a non-closed ring. The two ends of the mounting ring 61 respectively have a first lug 63 and a second lug 64 protruding radially outward. The first lug 63 and the second lug 64 are respectively provided with locking holes 65; the second C-type connector 62 is provided with a plurality of second connection holes 66 corresponding to the first threaded connection hole 15. The bottom surface of the second C-type connector 62 contacts the top surface of the first C-type connector 12. The first bolt 67 passes through the second connection hole 66 from top to bottom and is screwed into the first threaded connection hole 15; the mounting ring 61 can be mounted on the shaft neck 701 of the angle grinder, and the second bolt 68 passes through the locking hole 65. The mounting ring 61 is fastened to the shaft neck 701 of the angle grinder 700 through the locking nut 68.

[0033] In order to provide safety protection for the eccentric drive wheel 40 and the ball bearing 50, a cover body 140 is also provided. The cover body 140 surrounds the eccentric drive wheel 40 and the ball bearing 50 from the outside. The cover body 140 is fixedly connected to the supporting box 10 by screws 1401. Preferably, a threaded fixing column 17 is provided on the bottom surface of the first C-type connector 12, and the screws 1401 fix the cover body 140 to the threaded fixing column 17.

[0034] The structural strength and impact resistance of the carrying box 10 have an important impact on the service life of the chisel and shovel accessories. The existing technology generally increases the strength by increasing the material thickness and increasing the size, but this undoubtedly brings problems such as heavier products and increased costs. Therefore, better structural design and lightweight materials are one of the ideas for improvement.

[0035] Please refer to Figure 7 and Figure 8 The carrying box 10 of the present invention further has a reinforcing portion 16, which includes a side wall 1611 and a bottom wall 1612. The carrying body 11 and the first C-shaped connector 12 are reinforced by the side wall 1611 and the bottom wall 1612. The side wall 1611 and the bottom wall 1612 firmly connect the carrying body 11 and the first C-shaped connector 12 together.

[0036] As a further improvement, the lower part of the carrier 11 is designed as an arc surface 1613, and a honeycomb 1614 is provided on the arc surface 1613, which can further improve the stress. The carrier box 10 is preferably an aluminum die-casting integral part or a metal powder metallurgy integral part.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0038] In the above description of the present invention, it should be understood that the description of the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the above description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

Claims

1. An angle grinder accessory, comprising: A carrying box, wherein the carrying box has a first through hole extending from front to back; A blade mounting sleeve, wherein the blade mounting sleeve is at least partially located in the first through hole, and the blade mounting sleeve has a second through hole extending from front to back; a push rod, wherein at least a portion of the push rod is located in the second through hole; An eccentric drive wheel, wherein the eccentric drive wheel has an outer cylindrical surface; A ball bearing, wherein the inner ring of the ball bearing is fixedly connected to the outer cylindrical surface of the eccentric drive wheel; Adapting connectors; A shovel blade, wherein the shovel blade has a shovel handle, and the shovel handle can be inserted into the second through hole; Features: The carrying box is an integrally formed part, which has a carrying body and a first C-shaped connecting body. The carrying body is also provided with a first positioning column and a second positioning column. The first C-shaped connecting body is provided with a plurality of first threaded connection holes. A first threaded fastener is provided in the first positioning column. A second threaded fastener, a positioning spring and a steel ball are provided in the second positioning column from top to bottom in sequence. A second positioning pit is provided on the shovel handle; The blade mounting sleeve is also provided with a first positioning pit and a second positioning through groove, the first threaded fastener can be inserted into the first positioning pit, and the steel ball is at least partially located in the second positioning through groove and the second positioning pit; The push rod can move axially and rotate circumferentially in the second through hole; The ball bearing abuts against the push rod with its outer cylindrical surface; The adapter connector comprises a mounting ring and a second C-type connector, the mounting ring is a non-closed ring, and the mounting ring has a first lug and a second lug protruding radially outward at both ends, respectively, and the first lug and the second lug are respectively provided with locking holes; a plurality of second connecting holes are provided on the second C-type connector corresponding to the first threaded connecting holes, the bottom surface of the second C-type connector contacts the top surface of the first C-type connector, and the first bolt passes through the second connecting hole from top to bottom and is screwed into the first threaded connecting hole; the mounting ring can be sleeved on the shaft neck of the angle grinder, the second bolt passes through the locking hole, and the mounting ring is fastened to the shaft neck of the angle grinder by a locking nut and the second bolt; It also includes a cover body, which surrounds the eccentric drive wheel and the ball bearing.

2. The angle grinder attachment according to claim 1, characterized in that: The carrying box also has a reinforcement portion, which includes a side wall and a bottom wall. The carrying body and the first C-shaped connector are reinforcedly connected via the side wall and the bottom wall.

3. The angle grinder accessory according to claim 1, characterized in that: The push rod is also sleeved with a gasket, a return spring and a clamping ring. The gasket can slide on the push rod, the return spring is located between the gasket and the clamping ring, and the clamping ring is axially fixedly clamped on the push rod.

4. The angle grinder attachment according to claim 1, characterized in that: The lower part of the carrier has an arc surface, and a honeycomb is arranged on the arc surface.

5. The angle grinder attachment according to claim 1, characterized in that: A threaded fixing column is disposed on the bottom surface of the first C-shaped connector, and the threaded fixing column is used to install the cover body.

6. The angle grinder attachment according to claim 1, characterized in that: The carrying box is an aluminum die-casting integrally formed part or a metal powder metallurgy integrally formed part.

7. The angle grinder attachment according to claim 1, characterized in that: The first through hole is a circular through hole.

8. The angle grinder attachment according to claim 1, characterized in that: The second through hole is a circular through hole.

9. The angle grinder attachment according to claim 1, characterized in that: The first positioning column and the second positioning column are arranged along the length direction of the carrier.

Images