JPS6216280Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sponge grindstone mounting device that allows the sponge grindstone to be easily and reliably mounted on the rotating shaft of a grinder.

Conventionally, as a mounting device for a sponge grindstone, a fixing attachment/detachment tool having a boss part in the center that can be screwed onto the rotating shaft of the grinder in a freely attachable/detachable manner is screwed and fixed to the rotating shaft of the grinder with the boss part. A sponge grindstone having a center hole through which the rotation shaft is inserted is brought into contact with the fixed attachment/detachment tool, and a nut is screwed onto the rotation shaft from above the sponge grindstone and tightened, thereby attaching the sponge grindstone to the rotation shaft of the grinder. It is known that the device is designed to be attached to the body.

However, with the above-mentioned conventional grinding wheel, when replacing the sponge grinding wheel due to wear, etc., it is necessary to use a tool to screw the rotating shaft of the grinder into the nut and unscrew it, so the replacement work takes time. In addition, when the nut is tightened, the center of the sponge grinding wheel tends to shift easily, and as a result, when using the grinder, the imbalance in rotational centrifugal force caused by the shift causes wobbling, making it difficult to use. It was hot.

The present invention has been developed in view of these points, and it is possible to easily and reliably attach the sponge whetstone to the rotating shaft of the grinder at a predetermined center position without requiring any tools when replacing the sponge whetstone. By doing so, we aim to provide a sponge grindstone mounting device that not only simplifies the replacement work but also prevents shaking due to imbalance in the grinder mounting state and improves operability. .

That is, the present invention includes a disk-shaped fixing attachment/detachment tool that is screwed and fixed to the rotating shaft of a grinder, a ring plate-shaped sponge grindstone having a disk-shaped hard elastic backing material affixed to the back surface, and the above-mentioned. It includes a disc-shaped clamping nut that clamps the sponge grindstone in cooperation with the fixed attachment/detachment tool. The fixing attachment/detachment tool has a truncated cone-shaped concave portion in the center, and a boss portion is provided upright in the center of the concave portion to be removably engaged with the rotating shaft of the grinder. A cutout surface is formed on the outer periphery of the boss portion, and a plurality of protrusions projecting horizontally at equal circumferential pitches are provided on the outer periphery of the tip of the boss portion. Further, the sponge grindstone has a center hole having a diameter substantially equal to the recessed portion of the fixing attachment/detachment tool. In addition, the above backing material is
It has a central hole in the center of which the boss portion and protruding portion of the fixing attachment/detachment tool are inserted and are prevented from rotating by the cutout surface. Furthermore, the clamping nut has an outer diameter that can be fitted into the center hole of the sponge grindstone, and has a center hole in the center through which the boss portion of the fixing attachment/detachment tool is inserted, and on the periphery of the center hole, Notches through which the protrusions of the fixing attachment/detachment device are inserted and locking grooves into which the protrusions are fitted and locked are alternately formed at equal pitches. Then, the sponge grindstone is brought into contact with the fixing attachment/detachment tool by fitting the boss part and the protruding part of the fixing attachment/detachment tool into the center hole of the backing material, and the nut is inserted into the center hole of the sponge grindstone. After the boss portion and the protruding portion are fitted into the notch, the nut is rotated while being pressed against the elasticity of the backing material to engage the protruding portion of the locking groove of the nut. By stopping the sponge grindstone, the sponge grindstone is held by the fixed attachment/detachment tool with a nut, and is attached to the rotating shaft of the grinder.

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

In FIGS. 1 and 2, 1 is a grinder, and 2 is a rotating shaft of the grinder 1. The rotating shaft 2 has a male threaded portion 2a formed on the outer periphery of the shaft end. Reference numeral 3 denotes a grindstone holder fixed to the rotating shaft 2 so as not to rotate.

Reference numeral 4 denotes a disk-shaped fixing/detaching tool mounted on the rotating shaft 2 via the grindstone holder 3, and the fixing/detaching tool 4 is made of metal or synthetic resin. Further, as shown in FIG. 3, the center portion of the fixing attachment/detachment tool 4 is recessed into a truncated cone shape, and a center portion of the recessed portion 4a is provided with a part that can be detachably attached to the male threaded portion 2a of the rotating shaft 2. A cylindrical boss portion 5 that can be screwed together and has cutout surfaces 5a, 5a in two opposing directions (left and right directions in the figure) on the outer periphery is integrally provided, and is connected to the externally threaded portion 2a of the rotating shaft 2. The boss portion 5 is screwed together and fixed. Further, on the outer periphery of the tip of the boss portion 5, a plurality of (two in the figure) protrusions 6, 6 protrude horizontally at the center between the notch surfaces 5a, 5a on the circumference.
is installed protrudingly. In addition, two tool insertion holes 7, 7 are bored in the outer peripheral edge of the recessed portion 4a at a portion facing the notch surfaces 5a, 5a of the boss portion 5, and the fixing attachment/detachment tool 4 is provided with two tool insertion holes 7, 7. The fixation and removal of the screws, especially when the screws are tightly tightened, can be easily performed by engaging tools in the tool insertion holes 7, 7.

On the other hand, 8 is a sponge grindstone, and as shown in FIG. 4, it is shaped like a ring plate and has a center hole 9 having a diameter substantially equal to that of the concave portion 4a of the fixing attachment/detachment tool 4. Further, a backing material 10 is attached to the back surface of the sponge grindstone 8. The backing material 10
is made of a hard elastic body such as glass fiber or hard paper, and the boss portion 5 and the protruding portions 6, 6 of the fixing attachment/detachment tool 4 can be inserted into the center thereof, and the notch surfaces 5a, A central hole 11 is formed in a shape that prevents rotation at 5a.

Furthermore, 12 is the center hole 9 of the sponge grindstone 8.
The nut 12 is a disc-shaped clamping nut having an outer diameter that can be fitted into the nut 12, and as shown in FIG. A center hole 13 is bored, and
The outer periphery of the nut 12 has notches 14, 1 for preventing slipping when rotating the nut 12.
4,... are formed. In addition, the above nut 12
The periphery of the center hole 13 on the back surface is formed with a bulge portion 15 that bulges out in a truncated conical shape corresponding to the concave portion 4a of the fixing attachment/detachment tool 4, while the periphery of the center hole 13 on the surface of the nut 12 is Projection part 6 of the above-mentioned fixing attachment/detachment tool 4
Two notches 16 through which the protrusions 6 can be inserted and two locking grooves 17 into which the protrusions 6 are fitted and locked are alternately formed at equal pitches of 90 degrees. Then, the boss portion 5 and the protrusions 6, 6 of the fixing attachment/detaching tool 4 are fitted into the center hole 11 of the backing material 10, and the sponge grindstone 8 is brought into contact with the fixing attachment/detachment tool 4. The nut 12 is inserted into the hole 9, and the center hole 13 of the nut 12 is inserted into the boss portion 5 and the protruding portions 6, 6.
After the notches 16 and 16 are fitted, the nut 12 is inserted against the elasticity of the backing material 10.
The sponge whetstone 8 is clamped onto the fixed attachment/detachment tool 4 by the nut 12 by rotating it through 90 degrees while pressing and locking the protrusions 6, 6 in the locking grooves 17, 17 of the nut 12. The rotary shaft 2 is configured to be attached to the rotary shaft 2. Incidentally, reference numeral 18 denotes a protective cover that protects the spongy whetstone 8 from being scattered when fragments of the whetstone 8 are used.

Next, to explain the operation of the above embodiment,
When attaching the sponge whetstone 8 to the rotating shaft 2 of the grinder 1, the whetstone holder 3 is fitted and fixed to the rotating shaft 2 in advance, and the boss portion 5 of the fixing attachment/detachment tool 4 is inserted from above the whetstone holder 3. The male threaded part 2a of the rotating shaft 2
By screwing the fixing attachment/detachment tool 4 into the rotating shaft 2,
Attach and secure it. Thereafter, the boss portion 5 and the protrusions 6, 6 of the fixed attachment/detaching tool 4 are fitted into the center hole 11 of the backing material 10, and the sponge grindstone 8 is brought into contact with the fixed attachment/detachment tool 4. After fitting the clamping nut 12 into the hole 9 by fitting the central hole 13 and notches 16, 16 of the nut 12 into the boss portion 5 and the protruding portions 6, 6,
While pressing the nut 12 against the elasticity of the backing material 10, the nut 12 is rotated 90 degrees to lock the locking groove 1 of the nut 12.
By locking the protrusions 6 and 6 with the protrusions 7 and 17, the sponge grindstone 8 is held by the nut 12 on the fixed attachment/detachment tool 4, and the rotating shaft 2 of the grinder 1 is held.
will be installed on the

In this case, the engagement between the protruding portion 6 and the locking groove 17 of the nut 12 becomes strong due to the reaction force from the elastically deformed backing material 10, so that the engagement naturally separates. Without this, the sponge grindstone 8 is securely and firmly fixed at a predetermined central position. As a result, when the grinder 1 is used, the sponge grindstone 8 does not shake, and its operability can be improved. Moreover, the protrusion 6
Since the engagement between the groove 17 and the locking groove 17 is easily performed by rotating the nut 12 against the reaction force of the backing material 10, the sponge grindstone 8 can be easily attached.

In addition, when removing the sponge grinding wheel 8 to replace it due to wear or the like, first rotate the nut 12 further 90 degrees against the elasticity of the backing material 10, and then rotate the nut 12 through the notch 16 of the nut 12. ,16
After aligning the nut 12 with the protrusions 6, 6 of the fixing attachment/detachment tool 4, the nut 12 is pulled upward to release the engagement with the center hole 9 of the sponge grindstone 8. After that, when the sponge grindstone 8 is pulled upward, the boss portion 5 and the protrusions 6, 6 of the fixed attachment/detachment tool 4 come out of the center hole 9 of the backing material 10, and the sponge grindstone 8 is removed from the rotating shaft 2 of the grinder 1. Can be easily removed.

Therefore, since the sponge grinding wheel 8 can be easily attached to and detached from the rotating shaft 2 with simple operations, the work of replacing the sponge grinding wheel 8 is simplified, and thus Work efficiency can be improved.

In addition, the area around the center hole 13 on the back surface of the nut 12 is formed with a bulging portion 15 that bulges out in a truncated conical shape corresponding to the recessed portion 4a of the fixing attachment/detachment tool 4, so that no large force is required. The backing material 10 can be pressed and deformed, and therefore the nut 12 can be easily rotated, and work efficiency can be further improved.

Note that the present invention is not limited to the above-mentioned embodiments, but includes various other modifications. For example, in the above embodiment, the boss portion 5 integral with the fixing attachment/detachment tool 4 is provided upright at the center of the concave portion 4a of the fixation attachment/detachment tool 4, but a separate boss portion may be provided upright, and the same can be said. It is possible to achieve the following effects.

Further, in the above embodiment, two protrusions 6 that protrude horizontally on the outer periphery of the tip of the boss portion 5 are provided in two directions facing each other on the outer periphery, but three or more protrusions 6 may be provided at equal pitches on the circumference. Of course it's good.

Furthermore, it goes without saying that the number of cutout surfaces 5a formed on the outer periphery of the boss portion 5 for preventing rotation of the sponge grindstone 8 is not limited to two as in the above embodiment, and may be just one. .

Furthermore, the clamping nut 12 is not limited to the disc-shaped one having the notches 14, 14, . It can be of any shape.

As explained above, according to the present invention, the sponge grindstone can be easily attached to and removed from the rotating shaft without using any tools, and it can be attached reliably and firmly in the center position. This makes it possible to simplify the work of replacing the sponge grindstone, thereby improving work efficiency, and also to prevent the sponge grindstone from wobbling during use, thereby improving operability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical cross-sectional view when installed, FIG. 2 is a vertical cross-sectional view in an exploded state,
FIG. 3 is a plan view of the fixing attachment/detaching tool, FIG. 4 is a plan view of the sponge grindstone, and FIG. 5 is a plan view of the clamping nut. DESCRIPTION OF SYMBOLS 1... Grinder, 2... Rotating shaft, 4... Fixing attachment/detachment tool, 4a... Recessed part, 5... Boss part, 5a...
... Notch surface, 6 ... Protrusion, 8 ... Sponge grindstone, 9 ... Center hole, 10 ... Backing material, 11 ...
Center hole, 12... Nut, 13... Center hole, 15
...Bulging part, 16... Notch part, 17... Locking groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A disk-shaped fixed attachment/detachment tool that is screwed and fixed to the rotating shaft of the grinder, and a ring plate shape with a disk-shaped hard elastic backing material affixed to the back side. comprising a sponge grindstone and a disk-shaped clamping nut that cooperates with the fixed attachment/detachment tool to hold the sponge grindstone; , b. A boss portion is provided in the center of the concave portion to be removably screwed into the rotating shaft of the grinder, c. A cutout surface is formed on the outer periphery of the boss portion, and d. A plurality of protrusions projecting in the horizontal direction at equal circumferential pitches are provided on the outer periphery of the tip of the sponge grinding wheel, and the sponge grindstone has a center hole with a diameter substantially equal to the recessed part of the fixed attachment/detachment tool. The backing material has a central hole in the center of which the boss portion and the protruding portion of the fixing attachment/detachment tool are inserted and prevented from rotating by the notch surface, and the clamping nut has: a It has an outer diameter that can fit into the center hole of the sponge grinding wheel, has a center hole in the center through which the boss portion of the fixed attachment/detaching tool is inserted, and (b) has a center hole through which the boss portion of the fixed attachment/detachment tool is inserted. c) a notch through which the protruding part of the fixing attachment/detachment tool is inserted and a locking groove into which the protruding part is fitted and locked are alternately formed at equal pitches on the periphery of the center hole; Then, the sponge grindstone is brought into contact with the fixed attachment/detachment tool by fitting the boss part and protrusion of the fixing attachment/detachment tool into the center hole of the backing material, and the nut is inserted into the center hole of the sponge grindstone. After the boss portion and the protrusion are fitted into the notch, the nut is rotated while being pressed against the elasticity of the backing material, and the protrusion is inserted into the locking groove of the nut. A mounting device for a sponge grindstone, characterized in that the sponge grindstone is clamped and pressed by a fixed attachment/detachment tool with a nut by locking, and is mounted on a rotating shaft of a grinder. (2) The sponge whetstone according to claim 1, wherein the area around the center hole on the back side of the nut is formed into a truncated conical bulge corresponding to the recessed part of the fixing attachment/detaching tool. mounting device.