JPS6140465Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to rotary grinding wheels such as resinoid offset grinding wheels and resinoid flexible grinding wheels. Specifically, the present invention eliminates the need for a fastening nut that is required when attaching a rotary grinding wheel to the rotating shaft on the grinder side. This invention relates to a rotating whetstone with an integrated nut-shaped metal fitting.

In general, rotating grindstones such as resinoid offset grinding wheels and resinoid flexible grinding wheels have a mounting hole in the center thereof, and are used by being mounted on the rotating shaft of a grinder through the mounting hole via a seat.
In this case, in order to attach the grindstone to the rotating shaft of the grinder, first insert a catch into the bolt part with a male thread formed at the tip of the rotating shaft of the grinder, and then insert the bolt part into the mounting hole of the grinding wheel. Another fastening nut is screwed onto the external thread of the grinding wheel from the surface side of the grinding wheel.

It is also known that resinoid flexible grinding wheels are used by being indirectly attached to the rotating shaft of the grinder by interposing an adapter between the grinder and the rotating grindstone to reinforce the offset portion of the rotating grindstone. In this case, to attach a rotating whetstone to the grinder rotation shaft, first attach the adapter to the grinder, and then attach the whetstone to the bolt part of the adapter as shown above. After that, attach it to the grinder rotating shaft.

In the conventional grinding wheel as described above, when replacing the grinding wheel due to wear, it is necessary to use a tool to unscrew the threaded connection between the bolt part of the rotating shaft on the grinder side and the above-mentioned another fastening nut, which reduces the workability. There was a problem that the fastening nut was extremely poor and required a separate fastening nut for attaching the grindstone.

The present invention was developed to improve this defect, and by integrating a nut-shaped metal fitting into the center mounting hole of the grinding wheel, the grinding wheel can be easily attached to and removed from the grinder without the need for a conventional fastening nut. In order to improve workability and reduce the cost of discarded whetstones when replacing the whetstones, we developed a center hole that is screwed into the external thread of the rotating shaft on the grinder side. A female screw, a nut-shaped washer that comes into contact with the peripheral edge of the mounting hole at the center of the grinding wheel, a hollow boss that rises from the washer and is inserted into the mounting hole, and a tip of the hollow boss. A nut-shaped washer consisting of a caulked part that is caulked to the circumferential edge of the back side of the mounting hole is clamped and fitted to the circumferential edge of the front and back side of the mounting hole by the washer part and the caulked part of the washer. We aim to provide a rotating whetstone that is made of

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In FIGS. 1 to 3, 1 is a rotating shaft of the grinder, and a male threaded portion 1a is formed on the outer periphery of the shaft end of the rotating shaft 1, and 2 is a seat, which is a seat for the rotating shaft 1. When inserted, the male threaded portion 1a is loosely inserted into the insertion hole 2a of the seat 2, and the upper part of the insertion hole 2a is partially formed into a rectangular shape 2b, and the shaft base of the rotating shaft 1 is inserted into the shaft end. One end is fitted into the square portion 1b to prevent rotation.

On the other hand, 3 is a rotary grindstone such as a resinoid offset grinding wheel, a resinoid flexible grinding wheel, etc. 4 is a grindstone part, and the grindstone part 4 has an offset part 4a raised in the shape of a truncated cone and the offset part 4a.
A ring-shaped grinding part 4b continuous to the outer periphery of the grinding part 4b, and a circular mounting hole 4c is provided at the center of the offset part 4a (the center of the grindstone part 4).
Reference numeral 5 denotes a nut-shaped metal washer, which is fitted into the mounting hole 4c of the grindstone portion 4 and clamps the front and back peripheral edges 4d and 4e of the mounting hole 4c. It is fixed integrally with the whetstone part 4 to constitute the rotary whetstone 3.

The details of the rotary grindstone 3 are as follows. FIG. 3 shows the state before the washer 5 is clamped and fitted to the grindstone part 4, and a part of the back surface side peripheral edge 4e above the mounting hole 4c of the grindstone part 4 has an outwardly expanding shape. It's summery. 6 is the mounting hole 4c with adhesive
It is coated on the hole surface, the front peripheral edge 4d of the mounting hole 4c, and the flared end portion of the back peripheral edge 4e. On the other hand, the washer 5 has a center hole 5a drilled in the center, and a female thread 5b is provided below the center hole 5a so that it can be tightened easily with respect to the male threaded portion 1a of the grinder side rotating shaft 1. A lower part thereof is formed into a nut-shaped washer 5c, and a cylindrical hollow boss 5d that rises from the nut-shaped washer 5c and is fitted into the mounting hole 4c is formed, and the upper tip of the hollow boss 5d is a thin-walled portion 5e that expands outward, and the thin-walled portion 5e is a caulked portion 5f (the first
(see Fig. 2). Note that 5g is a hole for engaging a tool drilled in the washer portion 6c.

The above-mentioned state in which the whetstone part 4 and the washer 5 are clamped and fitted is shown in FIGS. 1 and 2, and the upper surface of the nut-shaped part of the washer part 5c The hollow boss portion 5d is fitted into the mounting hole 4c, and the thin wall portion 5e at the tip of the hollow boss portion 5d is in contact with the peripheral edge 4d on the front side of the mounting hole 4c. Back side peripheral part 4e
It is swaged to form a swaged portion 5f. As described above, the washer 5 holds the peripheral edges 4d and 4e of the front and back surfaces of the mounting hole 4c of the grindstone part 4 in a sandwich-like manner by the upper surface of the nut-shaped part of the washer part 5c and the caulking part 5f, and the hollow boss part 5d above mounting hole 4
In conjunction with the fitting into c, the washer 5 is firmly clamped onto the grindstone portion 4. When such a rotary grindstone 3 is attached to the grinder rotation shaft 1, as shown in FIG. 1, the washer 5 is screwed onto the grinder rotation shaft 1 in the tightening direction. An upward thrust is generated, and the upper surface of the nut-shaped part of the washer part 5c makes contact with the upper surface of the whetstone part 4.
By press-contacting the back side peripheral edge 4e of the mounting hole 4c on the upper surface of the offset portion 4a and the caulking portion 5f of the back side peripheral edge 4e to the lower surface of the seat 2,
The grindstone 3 is more firmly clamped and fixed between the washer portion 5c and the seat 2.

In the above embodiments, the caulking portion 5f is
Although the thin wall portion 5e at the tip of the hollow boss portion 5d is caulked to the peripheral edge 4e on the back side of the mounting hole 4c that widens toward the end, the tip portion of the hollow boss portion 5d is not made thin, but has the same thickness. A caulked portion 5f may be formed as a thick part, and the peripheral edge 4e on the back side of the mounting hole 4c may also be a straight hole instead of expanding at the end. In these cases, the caulked portion 5f may be formed by caulking work.
protrudes upward from the rear peripheral edge 4e of the mounting hole 4c. In this case, if an annular groove is provided at a corresponding position on the lower surface 2a of the seat 2 to accommodate the protruding caulking portion 5f, the above-mentioned Similarly, the washer 5 is firmly clamped and fitted to the grindstone portion 4.

Furthermore, in the above embodiment, the attachment hole 4c of the grinding wheel portion 4 is a round hole, and the hollow boss portion 5d that is fitted therein is cylindrical, but the attachment hole 4c is not a round hole but a square or elliptical shape. If the shape is non-circular and the outer periphery of the hollow boss portion 5d is also formed into a corresponding non-circular shape, the state in which the grindstone portion 4 and the washer 5 are fixed will be more secure, and the rotation prevention effect will be further improved.

Further, in the above embodiment, the adhesive 6 was applied to the hole surface of the attachment hole 4c of the grindstone portion 4 and the peripheral edge 4d on the front side of the attachment hole 4c, but the diameter of the rotary grindstone 3 is small and the weight is If the size is small, the grindstone portion 4 and the washer 5 can be firmly clamped together even without adhesive.

Various other design changes are possible as long as they do not contradict the purpose of the present invention.

The present invention is constructed as described above, and when the rotary grindstone 3 is mounted on the rotary shaft 1 of a grinder, the catch seat 2 is placed on the shaft end of the rotary shaft 1 in advance as shown in FIG. At this time, rotate shaft 1
The male threaded portion 1a on the outer periphery of the shaft end is inserted into the insertion hole 2 of the catch seat 2.
The upper portion of the insertion hole 2a is inserted into the rectangular portion 1b of the shaft base of the rotary shaft 1, and is prevented from rotating. Thereafter, the shaft end of the rotary shaft 1 is fitted into the center hole 5a of the washer 5 of the rotary grindstone 3, and the male threaded portion 1a on the outer periphery of the shaft end of the rotary shaft 1 is inserted into the center hole 5a of the washer 5. It is installed by being screwed into the internal thread 5b. At this time, since the above-mentioned screws are formed to be tightened freely in the direction of rotation of the rotary shaft 1, even if the screws are initially loosened, the screws will tighten as the rotary shaft 1 rotates during use. Since it is tightened, the rotary whetstone 3 is securely attached to the rotary shaft 1, and the rotary whetstone 3 will not come off the rotary shaft 1 during use. Moreover, as the washer 5 is tightened, the washer portion 5 of the washer 5
The peripheral edge 4 on the back side of the mounting hole 4c on the upper surface of the offset portion 4a of the grinding wheel portion 4 due to the upward pressing force of c
e and the caulking portion 5f of the washer 5 are pressed against the lower surface of the catch seat 2, and the grindstone portion 4 is apparently held between the washer portion 5c of the washer 5 and the catch seat 2. Even if the rigidity of 5f is weak, the caulked portion 5f will not be damaged by the force acting on the grinding wheel 3 during use, and the washer 5 and the grinding wheel portion 4 will be firmly fixed together in an integrated state. Therefore, it is possible to reliably prevent the grindstone part 4 from spinning around or coming off due to separation of the two.

On the other hand, when the rotary whetstone 3 is worn out and needs to be replaced, after the grinder has stopped, press your hand against the surface of the whetstone portion 4 of the rotary whetstone 3 in a direction opposite to the rotational direction of the rotary shaft 1 (i.e., in a direction opposite to the tightening direction). )
By turning the rotary whetstone 3, a large force couple acts on the rotary whetstone 3, so that the screw connection between the female thread 5b of the washer 5 of the rotary whetstone 3 and the male threaded portion 1a on the outer periphery of the shaft end of the rotary shaft 1 is loosened. As shown in FIG. 2, the rotary grindstone 3 can be easily removed from the rotating shaft 1. After that, a new whetstone 3, that is, one in which the whetstone part 4 and the washer 5 are integrated, can be screwed onto the rotary metal shaft 1 in the same manner as described above. Therefore, the rotary grindstone 3 can be easily and easily attached and detached without using any tools when replacing worn parts, and the workability can be improved. Further, when the couple is small, such as when the diameter of the rotary grindstone 3 is small, a tool may be used to separate it. Further, since the rotary grindstone 3 that is worn out and discarded is simply provided with a small washer 5, the cost per grindstone can be made relatively low.

Although the material of the washer 5 is not particularly specified, it is preferably made of metal or plastic having strength and rigidity similar to metal in terms of strength and rigidity. Particularly, from the viewpoint of reducing the load on the grinder, it is preferable to use a light material, for example, a light metal such as aluminum.

As detailed above, the rotating grindstone of the present invention has a female thread in the center hole of the washer so that it can be screwed into the male thread of the rotating shaft on the grinder side. It is easy to attach and remove, improving work efficiency when replacing worn-out rotary whetstones, and since the discarded rotary whetstones only have a small washer attached, it is possible to reduce the cost of whetstones. .

Further, the present invention provides the washer with a nut-shaped washer portion that comes into contact with the peripheral edge on the surface side of the mounting hole at the center of the grindstone portion, and a hollow boss portion that rises from the washer portion and is fitted into the mounting hole. The tip of the hollow boss part is configured by a caulking part formed by caulking the peripheral edge of the back side of the mounting hole, and the washer part and the caulking part clamp and fit the peripheral edge of the front and back side of the mounting hole of the grindstone part. The relationship between the grinding wheel part and the washer is firmly fixed as described above, and the two do not separate and rotate around, especially when an upward pressing force is applied to the seat when installed in the grinder. Both are more firmly attached.

In addition, the shape of the mounting hole of the grinding wheel part is made non-circular, and the corresponding part of the washer fitting into the mounting hole is made of the same non-circular shape. The rotation is even more securely stopped.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional side view of the rotary grindstone of the present invention when it is attached to a grinder, FIG. 2 is a vertical cross-sectional side view of the rotary grindstone of the present invention when it is removed, and FIG. It is a figure which shows the state before a grindstone part of a grindstone and a washer are clamped and fitted. DESCRIPTION OF SYMBOLS 1...Grinder rotating shaft, 1a...Male thread part, 4...Whetstone part, 4c...Mounting hole, 4d...Mounting hole surface side periphery, 4e...Mounting hole back side periphery, 5...Washer , 5a...center hole, 5b...female thread, 5c...nut-shaped washer part, 5d...hollow boss part, 5f...caulking part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A female thread in the center hole that is tightly screwed into the male thread of the rotating shaft on the grinder side, and a nut-shaped washer that comes into contact with the peripheral edge on the surface side of the mounting hole in the center of the grindstone part. a nut-shaped part, a hollow boss part that rises from the washer part and is fitted into the mounting hole, and a caulking part formed by caulking the tip of the hollow boss part to the peripheral edge of the back side of the attachment hole. A rotary whetstone comprising a washer that is clamped and fitted to the peripheral edge of the front and back sides of the mounting hole by the washer part and the caulking part of the washer. (2) Utility model registration claim No. (1) characterized in that the shape of the mounting hole is non-circular, and the corresponding portion of the washer that is inserted into the mounting hole has the same non-circular shape. Rotating whetstone as described in section.