Patent Application
20250025978
The present invention relates to a blade fastener for a grinder, and more particularly, to a blade fastener for a grinder in which the structure of the blade fastener for a grinder is improved, so that a grinder blade can be easily replaced and the vibration phenomenon of the blade can be minimized during work.
In general, hand grinders used for industrial machinery, shipbuilding, and other various structures are chiefly used for the purposes of smoothing rough surfaces of primarily processed parts or parts to be painted or partially cutting primary raw materials such as pipes, angles, steel plates, etc. For example, hand grinders receive power from an electric motor or compressor and operate grinder shafts at high speed, and are used for the purposes of polishing surfaces of objects made of stone or metal and performing finishing work by grinding or cutting unprocessed parts, edges, and the like. Usually, the grinder blade of such a hand grinder is used by attaching it to a grinder shaft using a method of inserting it into the grinder shaft and fixing it with a nut or a method of fixing the grinder blade by fastening a bolt to the grinder shaft.
Such a grinder blade has a short life cycle and must be replaced frequently during cutting or polishing work.
However, to replace the grinder blade, it is very difficult to loosen a nut or the like with human power or manual tools because secure tightening is performed or the nut is rotated further in the direction of force during use.
Accordingly, there is a problem in that the replacement work takes a lot of time, so that there is a disadvantage in that a grinding operation or cutting operation is delayed.
In order to overcome the above-described problems, the present invention provides a blade fastener for a grinder that prevents a fixing part from being further rotated around a drive shaft during grinding work after the installation of the fastener on the blade of the drive shaft of a grinder, so that the grinder blade can be easily replaced because the fixing part is easily separated from the drive shaft and so that the vibration phenomenon of the blade can be minimized during work.
In order to accomplish the above object, the present invention provides a blade fastener for a grinder, the blade fastener including: a fixing part configured to be screwed over a drive shaft for a grinder; a support part configured to be fitted over the lower portion of the fixing part and come into close contact with a blade for the grinder; a plurality of bearings configured to roll while rotating between the fixing part and the support part; and a snap ring configured to be installed in the lower portion of the fixing part and be caught on the support part.
The blade fastener for a grinder of the present invention includes the fixing part and the support part, so that the support part is rotated together with the grinder blade and a part is rotated together with the blade inserted into the drive shaft of the grinder, with the result that there are effects in that the grinder blade is easily replaced and the vibration of the blade is minimized during work.
The features will be understood by the embodiments described in detail below with reference to a blade fastener for a grinder according to the present invention.
Meanwhile, in the description of the technology, detailed descriptions of components that are widely known and used in the art to which the present invention pertains or does not pertain will be omitted. This is intended to omit unnecessary descriptions and more clearly convey the gist of the present invention accordingly.
As shown in
The grinder 10 has a conventional structure and is not described in detail. The grinder 10 is provided with a drive shaft 13, and a rotation guide member 11 is provided on the rear surface of the blade 12.
An upwardly protruding locking and unlocking guide portion 21 is formed on the upper portion of the fixing part 20, and a fitting portion 22 configured to be inserted into the support part 30, a fixing groove 23 formed in the outer surface of the fitting portion 22 and configured to fix the fixing member 50, a rotation support groove 24 configured to support parts of the surfaces of the bearings 40, and a screw hole 25 configured to be screwed into the drive shaft 13 are formed on the lower portion of the fixing part 20.
The outer surface of the locking and unlocking guide portion 21 may be provided in a quadrangular, pentagonal, hexagonal, or polygonal shape.
The support part 30 includes a rotation guide groove 31 formed to correspond to the rotation support groove 24 of the fixing part 20, a fitting hole 32 configured such that the fitting portion 22 of the fixing part 20 is inserted thereinto, and a stop protrusion 33 configured to prevent the fixing part 20 from being separated by fixing the fixing member 50 coupled to the fixing groove 23.
The bearings 40 are seated in the rotation support groove 24 of the fixing part 20 and the rotation guide groove 31 of the support part 30, and roll while rotating.
The fixing member 50 is provided in the shape of a ring having a constant thickness. The inner surface of the ring is inserted into the fixing groove 23 of the fixing part 20, and the outer surface of the ring is caught on the stop protrusion 33 of the support part 30 to prevent the fixing part 20 from being separated.
In addition, the fixing member 50 may be provided as a snap ring, a C ring, or the like.
As can be seen above, in the blade fastener for a grinder of the present invention, the blade 12 is first inserted into the drive shaft 13 and brought into close contact with the rotation guide member 11 at the same time. Thereafter, when the screw hole 25 of the fixing part 20 is screwed over the drive shaft 13, one side surface of the support part 30 comes into the outer surface of the blade 12. Thereafter, when the fixing part 20 is tightened to the drive shaft 13 by fastening a manual tool to the locking and unlocking guide portion 21, the support part 30 is brought into close contact with and fixed to the blade 12.
In this state, the blade 12 is rotated at a predetermined RPM by the driving shaft 13 having received the driving force of the grinder 10, and at the same time, the fixing part 20 and the support part 30 are rotated together. Thereafter, as the blade 12 comes into contact with the surface, RPM (rotational speed) is momentarily reduced, and the support part 30 is further rotated by 10° to 30 ° in the rotational direction of the blade 12 as shown in
As the fixing part 20 is easily separated from the drive shaft 13 as described above, the time taken to replace the blade 12 may be shortened.
In addition, the fixing part 20 and the support part 30 together with the blade 12 are primarily fixed to the drive shaft 13, and then the blade 12 is secondarily fixed to the support part 30 during polishing work. Accordingly, the vibration phenomenon of the blade 12 may be reduced.
Referring to
The protrusions of a spanner are inserted into the fastening guide depressions 26 and then the driving shaft 13 and the fixing part 20 are guided through tightening and loosening.
Although various design changes may be attempted within the same range as the subject of the present invention as described above, the design changes will not deviate from the scope of the present invention unless a new effect completely unexpected in the present invention appears.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0079360 | Jun 2022 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/018940 | 11/28/2022 | WO |
