JP2001310258A - Structure for mounting grinding wheel to grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for mounting a grinding wheel to a grinder allowing easy attaching/detaching of the grinding wheel to/from a rotating shaft without requiring a dedicated mounting nut. SOLUTION: The grinding wheel 2 and a joint member 3 for holding it are fitted to the rotating shaft 12 of the grinder 1. The joint member 3 comprises a magnet for securing the grinding wheel 2 so as to be adjustable for magnetic force acting on the grinding wheel 2 side. The grinding wheel 2 is formed by sintering after compressing and molding abrasive grains together with bond and the like into a disc shape, and a metal washer 23 is provided around an insertion hole 21 for insertion of the rotating shaft 12 of the grinder 1. The grinding wheel 2 is placed by being piled up on an upper face of the joint member 3, and the washer 23 is adhered to the joint member 3 by the magnetic force of the joint member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for detachably attaching a disk-shaped grinding wheel to a rotating shaft of a grinder.

[0002]

BACKGROUND OF THE INVENTION In order to easily perform cutting, grinding, polishing and the like, a hand-type grinder which can work by rotating a disk-shaped grinding wheel having a diameter of about 100 to 200 mm is used.

In order to attach a grinding wheel to this type of grinder, conventionally, a grinding wheel is fitted to a rotating shaft of the grinder via a washer, and then a dedicated nut is screwed into the rotating shaft to hold down the grinding wheel. It was fixed. However, in this method, it takes time and effort to attach and detach the dedicated nut to and from the rotating shaft, and it is not easy to change the grinding wheel. Polishing is usually performed in the order of rough, middle, fine, and finish, for example, by changing the count of about 10 ways, so operate the nut each time the roughness of the eyes changes. Changing the grinding wheel was extremely troublesome. In addition, the dedicated nut may be lost, and if it is lost, the grinder cannot be used, and the work may be interrupted.

Conventionally, in order to grind using a grinder, an elastic member such as rubber is attached to the rotating shaft, and sandpaper is attached to the tip end surface of the elastic member via a double-sided tape or a sheet fastener. Some were. However, in this method, there is a possibility that the adhesive force is reduced by heat generated at the time of processing and sandpaper is removed. In addition, the use of sandpaper was inferior in durability and required frequent replacement of sandpaper.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its main object no need for a dedicated mounting nut, therefore, no need for screwing work, and easy and quick attachment and detachment to a rotating shaft. It is an object of the present invention to provide a grinding wheel mounting structure for a grinder which can be surely performed, can easily change the roughness of eyes, and has excellent durability.

[0006]

In order to achieve the above object, a structure for mounting a grinding wheel on a grinder according to the present invention is a structure for detachably mounting a grinding wheel on a rotating shaft of the grinder. A grinding wheel and a joint member that holds the grinding wheel are fitted to the rotating shaft, and a magnet for fixing the grinding wheel to this joint member allows adjustment of the magnetic force acting on the grinding wheel side. It is characterized by being provided in.

Preferably, in addition to the above basic configuration,
The grinding wheel is formed by compression-molding abrasive grains into a disc shape together with a binder or the like and fired, and a metal washer is provided around the insertion hole to the rotating shaft of the grinder, The grinding wheel is mounted on the upper surface of a joint member so as to be superimposed thereon, and the washer can be attached to the joint member by a magnetic force of the joint member.

Alternatively, in addition to the basic structure, the grinding wheel is formed by compressing and shaping abrasive grains into a disc shape together with a binder and the like, and the joint member is disposed on a base end side of a rotating shaft. And a second joint member disposed on the tip side of the rotation shaft. After a grinding wheel is superimposed on the upper surface of the first joint member, a grinding wheel is formed between the first joint member and the first joint member. A second joint member is provided so as to sandwich the vehicle, and a part of the second joint member is connected to the first joint member by a magnetic force of a magnet provided in at least one of the joint members. A grinding wheel mounting structure for a grinder, characterized in that the grinding wheel is held between members.

[0009] More preferably, in addition to any one of the above configurations, the rotary shaft of the grinder, and the shaft holes of the joint member and the grinding wheel fitted to the rotary shaft are each formed in a polygonal shape. This is a structure for attaching a grinding wheel to a grinder. More preferably, the grinding wheel is attached to the grinder, wherein the rotating shaft of the grinder is provided with a stopper for preventing the grinding wheel from falling off from the rotating shaft.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure for mounting a grinding wheel on a grinder 1 according to the present invention will be described in further detail below. In addition,
Here, a case in which the grinding wheel 2 for polishing is attached to the hand-type grinder 1 will be described as an example. However, the configurations of the grinder 1 and the grinding wheel 2 are not limited to the following embodiments, and it goes without saying that the configuration can be changed as appropriate. No.

FIG. 1 is an exploded perspective view showing an embodiment of a grinding wheel mounting structure according to the present invention, and shows a tip end of a grinder 1. FIG. 2 is a longitudinal sectional view of the assembled state of the grinding wheel mounting structure of this embodiment.

As shown in FIG. 1, a horizontal plane 11 having a substantially semicircular shape in plan view is formed on the grinder 1 of this embodiment. The rotating shaft 12 is disposed at the center of the horizontal plane 11 so as to protrude upward. The rotating shaft 12 is rotatable by a motor built in the base end side of the grinder 1.

The configuration of the rotary shaft 12 is not particularly limited, and may be a general one having a circular cross section or a polygonal cross section. In the present embodiment, the rotary shaft 12 has a square cross section. A prismatic shaft is used. Along with this, if the shaft holes 21 and 31 of the grinding wheel 2 and the joint member 3 are formed in square holes that match the cross-sectional shape of the rotating shaft 12, the shaft holes 21 and 31 can be rotated without using screws or keys. The rotation of the shaft 12 can be reliably transmitted to the grinding wheel 21.

The grinding wheel 2 may be one in which sandpaper is provided on the cutting side surface of a base material made of an elastic material or the like, but in this embodiment, abrasive grains made of silicon carbide, gold sand and the like are used together with a binder and the like. What is formed into a disk shape by compression molding, firing, heat treatment to harden the binder and integrally molded is preferably used. In the grinding wheel 2 of this embodiment, the center portion is formed in a truncated cone shape and slightly recessed downward. A shaft hole 21 into which the rotating shaft 12 of the grinder 1 is inserted is formed through the center of the recess 22, that is, the center of the grinding wheel 2.

Shaft hole of this grinding wheel 2 (insertion hole to the rotating shaft)
Reference numeral 21 is substantially rectangular as described above. The grinding wheel 2 has a metal washer 2 around the shaft hole 21.
3 are provided. That is, as shown in FIG. 2, a thin metal plate is provided on the surface of the grinding wheel main body along the upper and lower surfaces around the shaft hole 21 of the grinding wheel 2 and along the inner peripheral surface of the shaft hole 21. . Instead of or in addition to the washer 23, the entire lower surface of the grinding wheel 2 may be covered with a metal plate or a metal coating.

A joint member 3 is provided on the lower surface of the center of the grinding wheel 2. The joint member 3 of this embodiment is
It is formed in a disk shape smaller in diameter than the grinding wheel 2. In the illustrated example, the diameter is slightly larger than the concave portion 22 of the grinding wheel 2, and the central portion is formed to have a shape matching the concave portion 22 of the grinding wheel 2. Therefore, the hollow portion 22 of the grinding wheel 2 is provided on the lower surface of the central portion of the grinding wheel 2 so as to be engaged with the hollow portion 22 from the outer surface side (lower side). A substantially rectangular shaft hole (insertion hole to the rotating shaft) 21 is formed through the center of the joint member 3 as in the case of the grinding wheel 2.

The joint member 3 has a magnet.
This magnet is for magnetically attaching the grinding wheel 2 to the joint member 3 in a detachable manner. In this embodiment, the grinding wheel 2
The grinding wheel 2 is magnetically attached to the joint member 3 via the metal washer 23 provided in the above. In order to facilitate attachment and detachment of the grinding wheel 2 and the joint member 3, it is preferable that the magnetic force acting on the grinding wheel can be adjusted.

For example, by providing the magnet in the joint member 3 so as to be rotatable by 90 degrees, it is possible to selectively direct any one of two adjacent surfaces of the magnet toward the grinding wheel 2. The magnetic force is reduced by providing a resin or the like on the surface of the magnet only on the other surface while leaving the magnet on the one surface. By doing so, when the one surface is turned to the grinding wheel 2 side, the magnetic force acts on the washer 23 of the grinding wheel 2 to firmly integrate the two 2 and 3 with each other. If the magnet is rotated so that the surface is directed toward the grinding wheel 2, the magnetic force acting between them is weakened, and the grinding wheel 2 can be removed from the joint member 3. Therefore, when changing the gear number or the like, the replacement of the grinding wheel 2 from the grinder 1 becomes easy. The adjustment of the magnetic force such as the rotation of the magnet is performed by a knob or the like disposed on the outer surface of the joint member 3.

The grinding wheel 2 is mounted on the rotating shaft 12 of the grinder 1 by inserting the grinding wheel 2 into the recess 32 of the joint member 3.
The two members 2 and 3 are integrated by the magnet of the joint member 3 by fitting the downwardly protruding portion (22) formed at the center of the member and overlapping them. Thereby, the grinding wheel 2
Since the shaft holes 21 and 31 of the joint member 3 are arranged at corresponding positions, the rotation holes 12 and 31 are provided in the shaft holes 21 and 31.
Just insert it.

When the bottom surface of the joint member 3 is fixed to the base end of the rotating shaft 12 of the grinder 1 by magnetic attachment or screwing, the grinding wheel 2 is magnetically attached to the joint member 3 and immediately. Polishing work and the like can be performed. For example, the polishing operation can be performed using the upper surface of the grinding wheel 2.

When the joint member 3 and the rotary shaft 12 of the grinder 1 are not fixed, or when it is desired to surely prevent the grinding wheel 2 from dropping from the grinder 1 during the work even if the fixing is performed, the rotary shaft is used. It is preferable to provide a stopper 13 at the tip end of 12. In the illustrated example, a horizontal groove 12a is formed in the outer peripheral portion of the distal end portion of the rotating shaft 12, and a substantially annular stopper 13 such as a clip is locked in the groove 12a. The clip 13 is movable in the diameter direction of the rotating shaft 12. When the clip 13 is disposed at the center of the rotating shaft 12 on each of the joint member 3 and the grinding wheel 2, both ends of the clip 13 project from the opposite side surfaces of the rotating shaft 12 by an equal distance. , Its clip 13
The fitting groove is formed at a position corresponding to the projecting portion.

Accordingly, when the grinding wheel 2 or the like is fitted on the rotating shaft 12, the clip 13 may be arranged at the center of the rotating shaft 12, and when the grinder 1 is used, the rotating shaft 12 rotates. The clip 1
Since the wheel 3 is biased so as to protrude greatly only from one side surface of the rotating shaft 12, it is possible to prevent the grinding wheel 2 from falling off from the rotating shaft 12.

The configuration of the stopper 13 can be changed as appropriate. For example, a pin may be provided so as to protrude from the side surface of the rotating shaft 12, and the pin may be pushed into the rotating shaft. In this case, the grinding wheel 2 or the like can be fitted to the rotating shaft 12 while pushing the pin so that the pin does not protrude from the side surface of the rotating shaft 12. It can again project radially outward from the rotating shaft 12 to prevent the grinding wheel 2 from falling off the rotating shaft.

When the grinding wheel 2 is replaced after the mounted grinding wheel 2 has been used, for example, by changing the number of the grinding wheel, the joint member 3 is operated to loosen the magnetic adhesion with the grinding wheel 2, and the joint member is removed. The wheel 2 can be removed from the wheel 3. Then, after that, a new grinding wheel 2 may be fitted to the rotating shaft 12 and strongly magnetized with the joint member 3.

FIG. 3 is a longitudinal sectional view showing an assembled state of another embodiment of the grinding wheel mounting structure of the present invention, and shows a leading end portion of the grinder 1. In this embodiment, the joint member 3 includes a first joint member 33 arranged on the base end side of the rotating shaft 2 and a second joint member 34 arranged on the distal end side of the rotating shaft 12. The first joint member 3
At least one of the third and second joint members 34 is provided with a magnet and is detachably magnetically attached to each other.

The first joint member 33 has substantially the same shape as the joint member 3 of the above embodiment. That is, it is formed in a shape that matches the outer shape of the concave portion 22 of the grinding wheel 2, and has a disk shape in which the central portion 32 is recessed downward.

On the other hand, the second joint member 34 is formed in a cylindrical shape having a flange 34a at the upper end. That is, in this embodiment, the flange portion 34a is formed in a rectangular cylindrical shape, and is integrally formed at the upper end portion so as to protrude radially outward.

In this embodiment, the first joint member 33
After fitting the grinding wheel 2 on the upper surface of the rotating shaft 12, the second joint member 34 is fitted on the rotating shaft 12. At this time, the cylindrical portion 34b of the second joint member 34 is fitted into the shaft hole 21 formed in the central portion of the grinding wheel 2, and the lower end surface of the cylindrical portion 34b is magnetically attached to the first joint member 33. Be worn. Also, the lower surface of the collar portion 34a of the second joint member 34
It is superposed on the upper surface of the grinding wheel 2. As a result, the grinding wheel 2 is divided into the first joint member 33 and the second joint member 3
As a result, each member is integrated with the corresponding one of the four brim portions 34a. In this embodiment, it is preferable that the magnetic force of the magnet is adjustable so that the magnet can be easily attached and detached between the joint members 33 and 34.

[0029]

As described above in detail, according to the grinding wheel mounting structure for the grinder of the present invention, the grinding wheel can be mounted in one touch with a magnet instead of the dedicated mounting nut. Therefore, the grinding wheel can be easily and quickly and reliably attached to the rotating shaft, and replacement is also easy. Therefore, it is easy to change the roughness of the grindstone, and work efficiency such as polishing work is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of a grinding wheel attachment structure to a grinder according to the present invention, showing a tip end portion of the grinder.

FIG. 2 is a longitudinal sectional view of the grinding wheel mounting structure of FIG. 1 in an assembled state.

FIG. 3 is a longitudinal sectional view showing an assembled state of another embodiment of the grinding wheel mounting structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinder 2 Grinding wheel 3 Joint member 12 Rotating shaft 13 Stopper 21 Insert hole (shaft hole) 23 Washer 31 Insert hole (shaft hole) 33 First joint member 34 Second joint member 34a Collar portion

Claims (5)

[Claims] 1. A structure for detachably attaching a grinding wheel to a rotating shaft of a grinder, wherein the rotating shaft of the grinder is fitted with a grinding wheel and a joint member for holding the grinding wheel. (3) A structure for mounting a grinding wheel on a grinder, wherein a magnet for fixing the grinding wheel to the joint member is provided so as to adjust a magnetic force acting on the grinding wheel side. 2. The grinding wheel is formed by compressing and shaping abrasive grains into a disk shape together with a binder and the like, and a metal washer is provided around a hole inserted into a rotating shaft of a grinder. The grinder according to claim 1, wherein the grinding wheel is provided so as to be superimposed on an upper surface of the joint member, and the washer can be attached to the joint member by a magnetic force of the joint member. Wheel wheel mounting structure. 3. The grinding wheel is formed by compressing and shaping abrasive grains into a disc shape together with a binder and the like, and the joint member is provided with a first joint member disposed on a base end side of a rotating shaft. , The second arranged on the tip side of the rotating shaft
A grinding wheel is superimposed on the upper surface of the first joint member, and a second joint member is provided so as to sandwich the grinding wheel between the first joint member and at least one of the joints. Due to the magnetic force of the magnet provided on the member, a part of the second joint member
The grinding wheel attaching structure to a grinder according to claim 1, wherein the grinding wheel is held between the two joint members by being connected to the joint member. 4. A rotary shaft of a grinder, and a shaft hole of a joint member and a grinding wheel fitted to the rotary shaft are each formed in a polygonal shape.
A grinding wheel mounting structure for a grinder according to any one of claims 1 to 3. 5. The grinding wheel mounting structure according to claim 4, wherein the rotating shaft of the grinder is provided with a stopper for preventing the grinding wheel from falling off from the rotating shaft.