JP2021084179A - Tool for changing grindstone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a dedicated tool used when replacing a grindstone of a disc grinder. A grindstone replacement tool 1 is used to rotate a grindstone 6 when a grindstone (grind wheel 5) fixed to a spindle 43 of a disc grinder 3 is replaced by a locknut 6. .. The grindstone replacement tool 1 includes a disk portion 11 formed in a disk shape as a tool body, pin-shaped protrusions 12a and 12b formed on one of the disk portions 11 and fitted with the locknut 6, and a disk. A hexagon bolt head portion 13 having a bolt head shape formed so as to project from the other board surface of the portion 11 is provided. [Selection diagram] Fig. 1

Description

The present invention relates to a grindstone replacement tool used when replacing a grindstone of a disc grind.

Conventionally, there is a disc grinder or the like as a power tool for processing the surface of an object to be processed by driving a rotary tool such as a rotary grindstone with a power source. A disc grinder is used to grind the surface of an object to be processed by driving a rotary tool with an electric motor or an air motor. Examples of the rotary tool include a disk-shaped grindstone, a diamond cutter, a cup-shaped grindstone, a wire brush, and the like, and an arbitrary rotary tool is selected according to the type of the object to be processed. For example, in order to grind the surface of an object to be processed such as concrete or stone, a grindstone wheel provided with a diamond grindstone is selected as a rotary tool, and the surface is ground by a disc grinder.

As an example of such a disc grinder, Patent Document 1 describes a rotary tool having a structure in which a grindstone is attached to a spindle of an electric disc grinder main body and fixed with a locknut.

JP 2013-75345

The locknut used in the conventional disc grinder described in Patent Document 1 has a special shape in order to avoid contact with the object to be processed, and needs to be strongly tightened to the spindle in order to prevent the grindstone from falling off. There is. For this reason, in conventional disc grinders, it is common to bundle a long dedicated spanner as an accessory of the disc grinder as a device for rotating the locknut, which makes it difficult to control the product price of the disc grinder. There are problems such as the packaging box of the disc grinding machine becoming large and the user having difficulty in securing a storage place for a dedicated spanner.

An object of the present invention is to provide a grindstone replacement tool capable of downsizing a dedicated tool used for replacing a grindstone of a disc grinder.

The grindstone replacement tool according to claim 1 is a grindstone replacement tool used to rotate the lock nut when the grindstone fixed to the spindle of the disc grinder by the lock nut is replaced. A fitting portion to be fitted with the lock nut is formed on one side of the main body, and a protruding portion having a bolt head shape is formed on the other side of the tool main body.

The grindstone replacement tool of the invention according to claim 2 is a grindstone replacement tool used to rotate the lock nut when the grindstone fixed to the spindle of the disc grinder by the lock nut is replaced. A disk portion formed in a disk shape as a main body, a fitting portion formed on one disk surface of the disk portion and fitted with the lock nut, and a bolt head formed so as to project from the other disk surface of the disk portion. It is characterized by including a protruding portion having a portion shape.

The grindstone replacement tool according to claim 3 is the grindstone replacement tool according to claim 1 or 2, wherein the fitting portion is formed in a plurality of fitting holes in which the locknut is formed. It is characterized by having a plurality of pin-shaped protrusions to be fitted.

The grindstone replacement tool of the invention according to claim 4 is the grindstone replacement tool according to any one of claims 1 to 3, and the tool body is provided with the grindstone fixed to the spindle. It is characterized in that a recess into which the tip of the spindle is inserted is formed at the time of replacement.

The grindstone replacement tool of the invention according to claim 5 is the grindstone replacement tool according to any one of claims 1 to 4, and the tool body has a hanging portion that can be hung from a hook. Is provided.

The grindstone replacement tool of the present invention has made it possible to reduce the size of the special tool used for replacing the grindstone of the disc grinder.

It is 1st explanatory drawing which shows the grindstone exchange using the grindstone exchange tool which concerns on 1st Embodiment of this invention. It is a 2nd explanatory drawing which shows the grindstone exchange using the grindstone exchange tool which concerns on 1st Embodiment of this invention. It is a 3rd explanatory view which shows the grindstone exchange using the grindstone exchange tool which concerns on 1st Embodiment of this invention. It is a perspective view of the grindstone replacement tool which concerns on 1st Embodiment of this invention. It is a top view and the side view of the grindstone replacement tool which concerns on 1st Embodiment of this invention. It is a top view and the side view of the grindstone replacement tool which concerns on the 2nd Embodiment of this invention.

<First Embodiment of the present invention>
Hereinafter, the grindstone replacement tool according to the first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a first explanatory view showing a grindstone replacement using a grindstone replacement tool according to the first embodiment of the present invention. FIG. 2 is a second explanatory view showing grindstone replacement using the grindstone replacement tool according to the first embodiment of the present invention. FIG. 3 is a third explanatory view showing grindstone replacement using the grindstone replacement tool according to the first embodiment of the present invention. FIG. 4 is a perspective view of the grindstone replacement tool according to the first embodiment of the present invention.

In FIG. 1, reference numeral 1 is a grindstone replacement tool, reference numeral 2 is a double-ended wrench for a general-purpose hexagon bolt, and reference numeral 3 is a disc grinder.

<Overall Configuration of Disc Grinder> Next, the structure of the disc grinder 3 using the grindstone replacement tool 1 according to the first embodiment of the present invention will be described.

In FIG. 1, the disc grinding machine 3 is used for grinding the surface of a concrete or stone material as an object to be processed, and the disc grinding machine main body 4, the grindstone wheel 5, and the locknut 6 are used. It is composed of and.

The disc grinder main body 4 has a handle-shaped motor case 41 and a gear case 42 attached to the tip of the motor case 41.

An electric motor is housed inside the motor case 41 as a power source. The electric motor is driven by electric power supplied from a battery attached to the rear end side of the motor case 41. A first bevel gear is attached to the rotating shaft of the electric motor.

On the other hand, the spindle 43 is arranged at right angles to the rotation axis of the electric motor by the gear case 42, and a second bevel gear that meshes with the first bevel gear is attached. With such a structure, the spindle 43 is rotationally driven by the electric motor.

The first and second bevel gears are housed in the gear case 42. The spindle 43 is rotatably supported by bearings attached to the gear case 42.

The tip of the spindle 43 protrudes from the gear case 42, and the grindstone wheel 5 as a rotary tool is detachably attached to the tip by the rotary tool holder 44. The rotary tool holder 44 is mounted on the spindle 43 in a state of being abutted against the abutting surface formed on the spindle 43. A right-handed male threaded portion 45 is formed at the tip of the spindle 43.

In FIG. 2, the gear case 42 is provided with a wheel guard 46 that covers about half of the inscribed angle of the grindstone wheel 5 attached and fixed to the spindle 43 (see FIG. 1).

A lock button 47 that locks the rotation of the spindle 43 is provided on the right side of the back surface of the gear case 42. A power switch 48 for turning on / off the electric motor is provided on the tip end side of the back surface of the motor case 41.

In FIG. 1, the grindstone wheel 5 has a substrate 51 formed of a steel plate in a circular silver shape, and a plurality of diamond grindstones are fixed to the front surface of the substrate 51 by means such as brazing. A through hole 52 into which the tip end side of the spindle 43 is inserted is formed in the center of the substrate 51. A circular pinched portion 53 sandwiched by the rotary tool holder 44 and the locknut 6 is formed around the through hole 52.

The locknut 6 is made of stainless steel and has a disk portion 61 formed in a disk shape. At the center of the disk portion 61, a female screw portion 62 into which the male screw portion 45 of the spindle 43 is screwed is formed.

The locknut 6 is detachably attached to the spindle 43 by screw-coupling the male screw portion 45 provided at the tip end portion of the spindle 43 to the female screw portion 62.

Further, the disk portion 61 is formed by arranging four fitting holes 63a, 63b, 63c, and 63d on the circumference and penetrating the disk surface. Inside the circumference corresponding to the four fitting holes 63a, 63b, 63c, and 63d of the disk portion, a step portion 64 that serves as a guide for fitting the grindstone replacement tool 1 is formed.

<Overall configuration of double-ended wrench> The double-ended wrench 2 is a general-purpose product that has been commercially available for fastening and loosening bolt heads, nuts, etc., and is gripped by an operator. A first spanner opening 22 formed at one end of the handle 21 and for sandwiching a bolt head, a nut, etc., and a second spanner opening 22 formed at the other end of the handle 21 for sandwiching a bolt, a nut, etc. It is equipped with a 2-spanner mouth 23.

As shown in FIG. 3, the first spanner opening 22 and the second spanner opening 23 can also sandwich the hexagon bolt head portion 13 of the grindstone replacement tool 1.

<Overall Configuration of Grindstone Replacement Tool> As shown in FIG. 1, the grindstone replacement tool 1 has a lock nut 6 when the grindstone wheel 5 fixed to the spindle 43 of the disc grinder 3 is replaced by the lock nut 6. It is used to rotate the.

The grindstone replacement tool 1 is made of stainless steel, has a disk-shaped disk portion 11 as a tool body, and as shown in FIG. 4, a pin that fits the locknut 6 on one surface of the disk portion 11. Shaped protrusions 12a and 12b are formed, and as shown in FIG. 1, a hexagon bolt head 13 serving as a hexagon bolt head-shaped protrusion is formed on the other disc surface of the disk portion 11.

The pin-shaped protrusions 12a and 12b shown in FIGS. 1 and 4 are formed in a pin shape, and among the four fitting holes 63a, 63b, 63c and 63 formed of the locknut 6 shown in FIG. It is fitted into each of the two diagonally arranged fitting holes.

As shown in FIG. 4, a recess 14 into which the tip of the spindle 43 is inserted is formed in the central portion of one of the disc surfaces of the disk portion 11 when the grindstone wheel 5 fixed to the spindle 43 is replaced. ing.

A step portion 15 for inserting a claw or the like when removing the grindstone replacement tool 1 from the locknut 6 is formed on the outer peripheral portion of one of the disc surfaces of the disk portion 11.

On the outer peripheral surface of the disk portion 11, a U-shaped hanging portion 16 that can be suspended from a hook attached to a wall of a work place or a belt of an operator is provided.

<Size of Grindstone Replacement Tool> The size of the grindstone replacement tool 1 will be described with reference to FIG.

5A and 5B show a grindstone replacement tool according to the first embodiment of the present invention, FIG. 5A is a plan view seen from one surface of the disk portion 11, and FIG. 5B is a pin-shaped protrusion. A side view seen from the forming side of the portion 12b, FIG. 5C is a side view seen from the forming side of the hanging portion 16.

In FIG. 5, the grindstone replacement tool 1 corresponds to the replacement of the grindstone wheel 5 having a diameter of 100 mm.

As shown in FIG. 5A, the length from the side surface of the disk portion 11 to the tip of the hanging portion 16 is 25.94 mm. The lengths of the straight portions 16a and 16b of the hanging portion 16 are 19.2 mm. The width between the straight portions 16a and 16b of the hanging portion 16 is 16 mm. The radius of curvature of the curved portion 16c of the hanging portion 16 is 10 mm.

As shown in FIGS. 5A and 5B, the thickness of the straight portions 16a and 16b and the curved portion 16c of the hanging portion 16 is 2 mm.

As shown in FIG. 5B, the length from the hanging portion 16 to the stepped portion 15 of the disk portion 11 is 3.5 mm.

As shown in FIG. 5C, the diameter of the disk portion 11 is 34 mm. The height of the hexagon bolt head 13 is 8 mm. The length from the other disc surface of the disc portion 11 to the step portion 15 of the disc portion 11 is 9 mm. The depth of the step portion 15 is 1 mm. The lengths of the pin-shaped protrusions 12a and 12b are 5 mm. The diameters of the protrusions 12a and 12b are 4 mm. The depth of the recess 14 is 5 mm. The diameter of the recess 14 is 11 mm.

<Replacement work of the grindstone wheel using the grindstone replacement tool> Hereinafter, the replacement work of the grindstone wheel 5 using the grindstone replacement tool 1 according to the first embodiment will be described.

In the replacement work of the grindstone wheel 5, the operator first removes the battery from the disc grinder 3. If the disc grinder 3 is an AC machine, unplug it. During the replacement in this way, the power is cut off from the disc grinder 3. Next, the operator pushes the lock button 47 of the disc grinder 3 shown in FIG. 2 to lock the rotation of the spindle 43 and prevent the grindstone wheel 5 from moving.

Next, while pressing the lock button 47, the operator attaches the pin-shaped protrusions 12a and 12b of the grindstone replacement tool 1 shown in FIGS. 1 and 4 to the four formed locknuts 6 shown in FIG. Of the fitting holes 63a, 63b, 63c, and 63 of the above, the fitting holes are fitted into two diagonally arranged fitting holes, respectively. As a result, the grindstone replacement tool 1 and the locknut 6 are in a fitted state.

Next, while pressing the lock button 47, the operator inserts the hexagon bolt head 13 of the grindstone replacement tool 1 into the first spanner opening 22 or the second spanner opening 23 of the double-ended wrench 2, and the double-ended wrench 2 By operating the handle 21 of the wrench to rotate the wrench replacement tool 1 and the locknut 6 counterclockwise (counterclockwise), the tightening of the spindle 43 and the locknut 6 is loosened. When the locknut 6 is loosened to some extent, the locknut 6 can be removed by a direct rotation operation with a finger.

When the locknut 6 is loosened to some extent, the operator removes the double-ended wrench 2 from the grindstone replacement tool 1, rotates the grindstone replacement tool 1 counterclockwise directly with a finger, and removes the locknut 6 from the spindle 43. As a result, the grindstone wheel 5 can be removed from the spindle 43.

The operator removes the old grindstone wheel 5 from the spindle 43 and attaches the new grindstone wheel 5 to the spindle 43.

After that, the operator screwed the male screw portion 45 of the spindle 43 into the female screw portion 62 of the lock nut 6 while pressing the lock button 47, and directly rotated the grindstone replacement tool 1 clockwise with his / her finger. Tighten the spindle 43 and the locknut 6 to the temporarily fixed state.

Next, while pressing the lock button 47, the operator inserts the hexagon bolt head 13 of the grindstone replacement tool 1 into the first spanner opening 22 or the second spanner opening 23 of the double-ended wrench 2, and the double-ended wrench 2 By operating the handle 21 of the wrench to rotate the wrench replacement tool 1 and the locknut 6 clockwise (clockwise), the spindle 43 and the locknut 6 are tightened. As a result, the grindstone wheel is firmly fixed to the spindle 43.

Next, the operator removes the grindstone replacement tool 1 from the lock nut 6 and releases the lock by the lock button 47 to complete the replacement of the grindstone wheel 5.

After that, the disc grinding machine 3 can be used by attaching a battery to the disc grinding machine 3 or by inserting an outlet when the disc grinding machine 3 is an AC machine.

To summarize the configuration and effect of the first embodiment of the present invention shown above, the grindstone replacement tool 1 is a grindstone (grindstone wheel 5) fixed to the spindle 43 of the disc grinding machine 3 by a locknut 6. Is used to rotate the locknut 6 when the locknut 6 is replaced.

In the grindstone replacement tool 1, a fitting portion (pin-shaped protrusions 12a, 12b) that fits with the locknut 6 is formed on one side of the tool body (disk portion 11), and the other side of the tool body. A protruding portion (hexagon bolt head 13) having a bolt head shape is formed in the bolt head.

The grindstone replacement tool 1 has a disk portion 11 formed in a disk shape as a tool body and a fitting portion (pin-shaped protrusion 12a) formed on one of the disk portions 11 and fitted with the locknut 6. , 12b), and a bolt head-shaped protrusion (hexagon bolt head 13) formed so as to protrude from the other disc surface of the disk portion 11.

The fitting portion is formed in a plurality of fitting holes (two fitting holes arranged diagonally among the four fitting holes 63a, 63b, 63c, 63) formed by the locknut 6, respectively. A plurality of pin-shaped protrusions (pin-shaped protrusions 12a, 12b) to be fitted.

The tool body (disk portion 11) has a
When the grindstone (grind wheel 5) fixed to the spindle 43 is replaced, a recess 14 into which the tip of the spindle 43 of the disc grinder 3 is inserted is formed.

The tool body (disk portion 11) is provided with a hanging portion 15 that can be suspended from a hook.

According to the grindstone replacement tool 1 having such a configuration, the hexagon bolt of the grindstone replacement tool 1 is used with a general-purpose tool such as a double-ended spanner 2 in a state where the lock nut 6 is fitted to the grindstone replacement tool 1. Since the lock nut 6 can be rotated by rotating the head portion 13, the grindstone replacement tool 1 which is a dedicated tool used when replacing the grindstone of the disc grinding machine can be miniaturized, and the disc grinding machine can be miniaturized. It is no longer necessary to attach a long dedicated spanner as an accessory to the product and sell it, it becomes easier to control the product price of the disc grinding machine, the packaging box of the disc grinding machine can be reduced, and the grindstone replacement tool 1 which is a dedicated tool can be used. A storage place can be easily secured.

Further, according to the first embodiment, since the grindstone replacement tool 1 is provided with a hanging portion 15 that can be hung on the hook, the risk of losing the small grindstone replacement tool 1 is avoided. Can be done.

<Second Embodiment of the Present Invention> The grindstone replacement tool 101 according to the second embodiment of the present invention will be described with reference to FIG.

FIG. 6 shows a grindstone replacement tool according to a second embodiment of the present invention, and FIG. 6A is a plan view of the grindstone replacement tool 101 as viewed from one of the discs 111 of the grindstone replacement tool 101. b) is a side view seen from the grindstone replacement tool 101 pin-shaped protrusion 112b forming side, and FIG. 6 (c) is a side view seen from the grindstone replacement tool 101 hanging portion 116 forming side.

In FIG. 6, the grindstone replacement tool 101 corresponds to the replacement of a grindstone wheel having a diameter of 180 mm.

As shown in FIG. 6A, the length from the side surface of the disk portion 111 to the tip of the hanging portion 116 is 35 mm. The lengths of the straight portions 116a and 116 of the hanging portion 116 are 24.55 mm. The width between the straight portions 116a and 116b of the hanging portion 116 is 24 mm. The radius of curvature of the curved portion 116c of the hanging portion 116 is 15 mm.

As shown in FIGS. 6A and 6B, the thickness of the straight portions 116a and 116b and the curved portions 116c of the hanging portion 116 is 3 mm.

As shown in FIG. 6B, the length from the hanging portion 116 to the step portion 115 of the disk portion 111 is 5 mm.

As shown in FIG. 6C, the diameter of the disk portion 111 is 54 mm. The height of the hexagon bolt head 113 is 8 mm. The length from the other disc surface of the disc portion 111 to the step portion 115 of the disc portion 111 is 13 mm. The depth of the step portion 115 is 1 mm. The lengths of the pin-shaped protrusions 112a and 112b are 7 mm. The diameters of the protrusions 112a and 112b are 4 mm. The depth of the recess 114 is 8 mm. The diameter of the recess 114 is 16 mm.

According to the grindstone replacement tool 101 according to the second embodiment described above, the same effect as that of the first embodiment can be obtained even when the grindstone wheel having a diameter of 180 mm is replaced.

In the first and second embodiments, the shape and material of each part of the grindstone replacement tools 1 and 101 can be changed in various ways. For example, the main body shape of the grindstone replacement tool may be other than the disk type. , Square plate type, etc., and various materials such as titanium alloy, carbon steel, etc. can be applied in addition to stainless steel as the material of the grindstone replacement tool.

Further, in the embodiment of the first and second embodiments, as a method of providing the hexagon bolt head and the hanging portion on the grindstone replacement tool, welding with the disc portion, integral molding, screwing, etc. Various applications are possible.

Further, in the embodiment of the first and second embodiments, the suspension portion may not be provided.

Further, in the embodiment of the first and second embodiments, the configuration corresponding to the replacement of the grindstone wheels of 100 mm and 180 mm, respectively, may be the configuration corresponding to the replacement of the other grindstone wheels.

Further, in the first and second embodiments, the hexagon bolt head shape used for the hexagon bolt was used as the bolt head shape, but the hexagon head shape used for the square bolt was used as the bolt head shape. It can be applied to various places such as the shape of the bolt head and the shape of the butterfly head used for the butterfly bolt.

As described above, the means, method, shape, etc. of the present invention can be variously changed without changing the gist of the present invention.

For example, it is possible to combine two or more means into one, and conversely, it is also possible to configure one means from two or more other means and connect them.

In addition, the first and second embodiments are only two of the best forms at present or similar forms.

1: Grinding tool replacement tool 2: Double-ended wrench 3: Disc grinder 4: Disc grinder body 5: Grinding wheel 6: Lock nut 11: Disc 1112a, 12b: Pin-shaped protrusion 13: Hexagon bolt head 14: Recess 15 : Step 16: Hanging 21: Handle 22: 1st wrench port 23: 2nd wrench port 41: Motor case 42: Gear case 43: Spindle 44: Rotating tool holder 45: Male screw part 46: Wheel guard 47: Lock Button 48: A power switch 48 is provided. 51: Substrate 52: Through hole 53: Holdn portion 61: Disk portion 62: Female threaded portions 63a, 63b, 63c, 63d: Fitting hole

Claims (5)

A grindstone replacement tool used to rotate the locknut when replacing the grindstone fixed to the spindle of the disc grinder with a locknut.
A grindstone replacement tool characterized in that a fitting portion that fits with the locknut is formed on one side of the tool body, and a bolt head-shaped protrusion is formed on the other side of the tool body. .. A grindstone replacement tool used to rotate the locknut when replacing the grindstone fixed to the spindle of the disc grinder with a locknut.
A disk portion formed in a disk shape as a tool body, a fitting portion formed on one disk surface of the disk portion and fitted with the locknut, and a bolt formed so as to project from the other disk surface of the disk portion. A grindstone replacement tool characterized by having a head-shaped protrusion. The grindstone replacement tool according to claim 1 or 2, wherein the fitting portion is a plurality of pin-shaped protrusions that are fitted into the plurality of fitting holes in which the locknut is formed. According to any one of claims 1 to 3, the tool body is formed with a recess into which the tip of the spindle is inserted when the grindstone fixed to the spindle is replaced. The described grindstone replacement tool. The grindstone replacement tool according to any one of claims 1 to 4, wherein the tool body is provided with a hanging portion that can be hung from a hook.

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