JP2001225275A - Buffing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffing tool capable of rapidly and uniformly polishing a surface to be polished by providing a rotary disc with moderate flexibility, and heightening the durability of the rotary disc and firmly fixing an output shaft to the rotary disc. SOLUTION: This buffing tool 1 has a driving motor 3 built in an insulating housing 2. The rotary disc 10 formed of an elastic material is fixed to the tip of the output shaft 8 of the motor 3. A buff 12 is detachably fitted to the front face (the lower face in figure 1) of the rotary disc 10. The outer peripheral part of the rotary disc 10 has through-holes H formed at specified spaces in a circumferential direction. The through-holes H are formed in non-angular shape such as circular or elliptic shape. Each through-hole H has the same hole shape, and each through-hole H is arranged on the circumference with a constant radius from the center of the disc face. Further, the width L of each rib formed between the circumferentially adjacent holes out of the through- holes H is set into the range of 5<=L<=20 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffing tool used for polishing, for example, an automobile body.

[0002]

2. Description of the Related Art In a buffing tool, a buff is rotated at a high speed by an output shaft driven by a motor to polish a surface to be polished. A turntable is provided at the tip of the output shaft, and a buff is detachably attached to the turntable. Rubber,
An elastic material such as plastic is used. Usually, these materials are formed into a disk shape, and the output shaft is fixed at the center position. When using a buffing tool, when the buffing surface is slightly inclined and pressed against the surface to be polished, the turntable bends backward,
The buff is pushed back by the repulsive force of the turntable, and a frictional force is generated between the polished surface and the buff surface.

[0003]

However, when such a conventional buffing tool is used, the polishing operation may be difficult to perform because the elastic force of the rotating disk is too large. For example, in the case of polishing a curved surface or an uneven surface, the rotating disk is hardly deformed along the surface to be polished, so that the contact area between the buff surface and the surface to be polished becomes narrow, and the polishing operation takes time.

On the other hand, it is conceivable to make the material of the turntable more flexible. However, if the turntable is made entirely flexible, the durability of the turntable decreases, and the output shaft and the turntable are connected. It becomes difficult to fix firmly.

Accordingly, the present invention has been made in view of such a situation, and provides a rotating disk with appropriate flexibility to quickly and uniformly polish a surface to be polished and to improve durability of the rotating disk. It is another object of the present invention to provide a buffing tool which can firmly fix an output shaft and a rotating disk.

[0006]

A buffing tool according to the present invention for solving the above-mentioned problems comprises a motor housed in a housing, an output shaft driven by the motor, and fixed to a tip end of the output shaft. A buffing tool having a rotating disk to be mounted and a buff detachably attached to the rotating disk, wherein a plurality of through holes are formed at predetermined intervals in an outer peripheral portion of the rotating disk.

[0007] According to the buffing tool of the present invention, appropriate flexibility is obtained in the outer peripheral portion of the turntable by the through hole. That is, when a force is applied in the circumferential direction of the turntable, the rib formed between the adjacent through holes easily bends up, down, left, and right with respect to the board surface. Thereby, even when polishing a curved surface or an uneven surface,
The buff surface is easily bent along the surface to be polished, and the workability can be improved. Further, since the flexibility of the outer peripheral portion is selectively enhanced as compared with the central portion of the rotating disk, the rotating disk can be formed of a relatively hard material. For this reason, the durability of the turntable is improved, and the fixing strength between the output shaft and the turntable can be increased.

[0008] It is desirable that the shape of the through hole is a cornerless shape such as a circle, an oval, and an ellipse. If the shape of the through-hole has a corner shape such as a rectangle or a sector, stress is concentrated around the corner of the hole of the rotating disk during polishing, and the rotating disk is easily damaged. On the other hand, by making the shape of the through-holes into a square shape, the force applied in the circumferential direction of the turntable is dispersed, so that the endurance of the turntable is improved and workability during polishing is improved.

It is preferable that the center of gravity of the rotary disk coincides with the center of the disk surface. More specifically, it is preferable that the shape of each through-hole is the same, and that each through-hole is arranged on a circumference having a constant radius from the center of the board (output shaft). This is for reliably preventing vibrations and the like of the turntable and improving workability.

It is preferable that a width L of a rib formed between circumferentially adjacent holes in the through hole is in a range of 5 ≦ L ≦ 20 mm. This is because, if it is set within the above range, the polishing operation can be performed more comfortably. According to the experiments by the inventors, when the width L of the rib is smaller than 5 mm, the rotating disk is too soft, the frictional resistance between the polished surface and the buff surface is reduced, and the workability is reduced. On the other hand, the width L of the rib
Exceeds 20 mm, the workability at the time of polishing is almost not much different from the case of using a rotary plate without through holes.

[0011] The rotating disk of the buffing tool according to the present invention is a buffing tool rotating disk in which a predetermined buff can be detachably attached to the tip of the output shaft of the buffing tool. A plurality of through holes are formed at predetermined intervals in the outer peripheral portion of the board.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
Has a motor 3 for driving incorporated in an insulating housing 2. The rotating disk 10 is fixed to the tip of the output shaft 8 of the motor 3. On the side surface of the housing 2, a main grip 4, a switch 5, and a sub grip 6 are provided. A power cord 7 is taken out from the rear end of the main grip 4.

A buff 12 is detachably attached to the front surface (the lower surface in FIG. 1) of the turntable 10. The buff 12 is made of sponge, cloth, or the like, and its front surface (buff surface) is pressed against the surface to be polished.

As shown in FIGS. 2 and 3, the disk-shaped rotary disk 10 is made of an elastic material such as rubber or plastic, and a cylindrical joint 13 is integrally formed at the center of the rotary disk 10. . When the joint 13 is inserted into the tip of the output shaft 8, the output shaft 8 is substantially perpendicular to the rotating surface of the turntable 10.

Oval through holes H are formed in the outer peripheral portion of the turntable 10 at predetermined intervals in the circumferential direction. Each through hole H has the same shape, and a rib 10a is formed between each hole. The positions of the through holes H are arranged at substantially equal intervals on a circumference around the output shaft 8. This allows
The center of gravity of the turntable 10 coincides with the rotation axis of the output shaft 8, so that the vibration of the turntable 10 during rotation is prevented.

On the opposing surfaces of the turntable 10 and the buff 12,
The hook-and-loop fastener 15 is fixed. The hook portion and the loop portion of the hook-and-loop fastener 15 are entangled with each other or separated from each other, so that the hook portion and the loop portion are detachable. An operator attaches various buffs 12 having different polishing forces to the surface fastener 15 according to a polishing purpose.

When the buffing tool 1 is used, first, a buff 12 is attached to the turntable 10, and a buffing surface is coated with a polishing wax, an abrasive, or the like, and is impregnated. Next, the power cord 3 is connected to a commercial power source, and the switch 5 is turned ON while holding the main grip 4 and the sub grip 6. Then, the output shaft 8 of the drive motor 3 and the rotating disk 10 rotate, and the buff 12 rotates accordingly.

When performing a polishing operation, as shown in FIG.
The buff surface 12a is slightly inclined with respect to the polished surface T, and the outer peripheral portion of the buff surface 12a is pressed against the polished surface T.
Then, the rotating disk 10 bends, and the buff 1
2, an appropriate frictional force is generated between the polished surface T and the buff surface 12a.

According to the turntable 10, since the outer peripheral portion of the turntable 10 is more easily bent by the through holes H, the contact area between the surface T to be polished and the buffing surface 12a is increased, and the polishing is performed uniformly and quickly. Work can be performed. Also,
Even when a curved surface or an uneven surface is polished, the buff surface 12a is easily deformed along the shape of the surface T to be polished, so that polishing unevenness hardly occurs.

Next, an experimental example regarding the size of the through hole of the rotating disk will be described. Through-holes of various sizes were formed in a conventional general rubber rotary disc, and the flexibility, polishing power, and workability were evaluated. In the experiment, a rotating disk having a diameter of 150 mm and a rubber hardness of 70 (according to JIS K6253 hardness testing method for vulcanized rubber and thermoplastic rubber) was used. The position of the through hole of the turntable is such that the center of the through hole is aligned on the circumference around the output shaft 8 and the hole diameter R1 in the radial direction of the through hole is 4 mm.
5 mm, the distance R2 from the outer diameter end of the turntable to the through hole
Was set to 10 mm (see FIG. 5). Then, by changing the length of the interval (rib width) L between the adjacent through holes, the flexibility, the polishing force, and the workability were compared with the case where no through holes existed. The "flexibility" refers to the ease of deformation of the rotating disk during polishing, the "polishing force" refers to the magnitude of the frictional resistance between the polished surface and the buff surface, and the "workability" refers to the buffing tool used during polishing. It means easy rampage. Table 1 shows the results.

[0021]

[Table 1] In Table 1, "△" is almost the same as that of no hole (Experimental Example 1).
“○” indicates good, and “◎” indicates extremely good. As shown in Table 1, when the rib width L was 30 mm, the evaluation was the same as in the case of no holes (Experimental Example 1) in terms of flexibility, polishing force and workability. Each evaluation of flexibility, polishing power, and workability was improved as compared with Example 1. On the other hand, when the rib width L becomes 5 mm,
The evaluation of the polishing force was lower than the rib width of 10 mm. From these experimental results, when the rib width L between the circumferentially adjacent through holes H is set in the range of 5 ≦ L ≦ 20,
The flexibility, the polishing power and the workability are all superior to those without holes (Experimental Example 1), and it can be seen that the polishing work becomes comfortable.

In the rotary disk 10, the shape of the through hole H is oblong. However, the shape of the hole is not limited to this, and may be changed to an ellipse, a circle, a square, a triangle, a fan, or the like. In particular, when the shape is a cornerless shape such as a circle and an ellipse, stress concentration on the corners of the turntable can be avoided, and the durability can be further improved. In the buffing tool 1, the present invention is applied to an electric motor type polishing tool. However, the present invention can be applied to an air motor type polishing tool.

[0023]

As described above, according to the buffing tool of the present invention, the following excellent effects can be obtained. (a) Since the flexibility of the turntable is improved and the contact area between the surface to be polished and the buff surface can be kept large, a uniform and quick polishing operation becomes possible. (b) Even when polishing a curved surface or an uneven surface, the rotating disk is easily deformed along the surface to be polished, so that polishing unevenness is reduced. (c) the turntable can be formed of a relatively hard material,
Durability can be increased. (d) The turntable and the output shaft can be firmly fixed,
Work reliability and safety are increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a buffing tool according to an embodiment of the present invention.

FIG. 2 is a plan view showing a turntable of the buffing tool according to the embodiment of the present invention.

FIG. 3 is a side view showing a turntable of the buffing tool according to the embodiment of the present invention.

FIG. 4 is a side view showing a use state of the rotating disk of the buffing tool according to the embodiment of the present invention.

FIG. 5 is a plan view for explaining a rotating disk of a buffing tool used in an experimental example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buffing tool 2 Housing 3 Motor 4 Main grip 6 Subgrip 8 Output shaft 10 Turntable 12 Buff

Claims (5)

[Claims] 1. A motor housed in a housing, an output shaft driven by the motor, a turntable fixed to a tip of the output shaft, and a buff detachably attached to the turntable. A buffing tool, wherein a plurality of through holes are formed at predetermined intervals in an outer peripheral portion of the rotating disk. 2. The hole shape of the through hole is circular, oval,
2. The buffing tool according to claim 1, wherein the buffing tool has an oval shape. 3. The buffing tool according to claim 1, wherein each of the through holes has the same hole shape, and the through holes are arranged on a circumference having a constant radius from the center of the board surface. 4. The buffing tool according to claim 1, wherein a width L of a rib formed between circumferentially adjacent ones of the through holes is set within a range of 5 ≦ L ≦ 20 mm. 5. A rotating disk of a buffing tool in which a predetermined buff can be detachably attached to a distal end portion of an output shaft of the buffing tool, wherein a predetermined distance is maintained at an outer peripheral portion of the rotating disk. A turntable for a buffing tool, wherein a plurality of through holes are formed.