JPH10277909A - Polishing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently polish a desired region of a surface to be polished without leaving an unprocessed part by rotationally moving a polishing part, which is coupled with a shaft part via a joint means, in the shaft diametrical direction so as to be brought in planar contact with the surface to be polished, suppressing the rotational movement in the shaft circumferential direction of the polishing part, and reciprocating on the surface to be polished. SOLUTION: A joint means 3 is constituted of a spherical recess part 31 and a ball part 32. A main body 22 constituted of an elastically deforming synthetic resin member and the spherical recess part 31 are integrally formed. The ball part 32 is pressed against the spherical recess part 31 whose entrance diameter is formed narrower than the diameter of the ball part 32 so that the spherical recess part 31 is elastically deformed and expanded, the spherical recess part 31 and the ball part 32 plus a ring recess part 33 and a ring projection part 34 extended parallel to each other in the longitudinal direction of the main body 22 are slidably engaged with each other respectively, and the entrance of the spherical recess part 31 is returned to its original state so that the ball part 32 is held in such a state as not being easily drawn out from the spherical recess part 31. As a result, the rotational movement in the shaft circumferential direction is suppressed and the polishing part 2 can be rotationally moved in the shaft diametrical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tool used for a hand-held polishing apparatus for reciprocating a polishing tool.

[0002]

2. Description of the Related Art Conventionally, a hand-held polishing device has been used for finishing or deburring a machine product such as a machine part or a mold. The hand-held polishing device revolves a polishing tool and a polishing tool. There are two types, which are properly used according to the shape of the surface to be polished and the desired finished surface. In particular, the latter hand-held polishing apparatus that reciprocates the polishing tool, a flat file-shaped polishing tool having a rectangular cross section,
Grinding tool with a grinding part and a shaft part that has a grinding stone part that performs circular or rectangular grinding in plan view via a ball joint is chucked to the holder and tilted as if holding a writing instrument. It is common to grind a flat surface or a vertical surface or a corner that rises from a flat surface in the manner of reciprocating the tip of a polishing tool to a desired surface to be polished. In the case of performing polishing, the above-mentioned ball joint type is used.

[0003]

However, when the corner portion W1 as shown in FIG. 6 is polished by using such a ball-joint type polishing tool D having a rectangular shape in a plan view, there is no problem. Since the joint is a free joint having a wide range of motion, the polishing section D1 is applied to the hand-held polishing apparatus B depending on the degree of application of force and the difference in surface roughness of the surface to be polished.
Is rotated (indicated by a two-dot chain line) and the desired region cannot be polished as desired. Therefore, the present invention is used in a reciprocating type hand-held polishing apparatus, and while maintaining an appropriate holding tilt angle, maintaining the orientation of the directional polishing unit in a desired direction, a desired surface to be polished. It is an object of the present invention to provide a polishing tool capable of efficiently performing a polishing process.

[0004]

The technical means taken to achieve the above object is to connect a polishing section having a grindstone portion for performing polishing and a main body supporting the grindstone portion, and connecting the polishing portion. And a shaft portion that supports the polishing portion is connected via joint means that suppresses rotation in the circumferential direction of the shaft and selectively rotates and detachably engages the polishing portion in a required direction in the shaft radial direction. It is characterized by the following.

According to the above technical means, a polishing tool is attached by chucking the base end side of the shaft portion to the chuck portion of the hand-held polishing device. And drive the hand-held polishing device,
When holding the hand-held polishing device and pressing the polishing part against the surface to be polished just as if holding a writing instrument, the polishing part connected to the shaft part via joint means rotates in the shaft radial direction and the grinding stone part The polishing unit is reciprocated on the surface to be polished while making surface contact with the surface to be polished and suppressing the rotation of the polishing unit in the axial direction. In addition, since the joint means is selectively rotated and removably engaged in a required direction of the shaft radial direction, the direction of the polishing portion formed in an arbitrary shape is appropriately selected, and the direction is maintained. , The grindstone portion comes into surface contact with the surface to be polished, and the polishing portion is prevented from rotating in the axial direction, and reciprocates on the surface to be polished (claim 1).

The above-mentioned main body is formed of an elastically deformable synthetic resin member, and the above-mentioned joint means is provided integrally with the main body and communicates with the outside through a deepest portion at a predetermined angle in a circumferential direction. A spherical concave portion provided with a plurality of annular concave portions and a spherical concave portion provided at an end of the shaft portion and having an annular convex portion provided on an outer peripheral surface of the outer peripheral surface so as to be slidably engaged with the annular concave portion. And a ball portion.

According to the above-mentioned technical means, the desired annular concave portion and the annular convex portion are made to coincide with each other, and the ball portion provided with the annular convex portion on the outer peripheral surface is formed of an elastically deformable synthetic resin member. By pressing against the spherical concave portion of the main body provided with the circular concave portion, the circular concave portion is elastically deformed, and the ball portion is rotatable in the axial radial direction with respect to the spherical concave portion of the main body. Engagement while suppressing rotation in the direction. Moreover, by appropriately selecting a plurality of annular concave portions provided at a predetermined angle in the circumferential direction of the spherical concave portion and engaging the ball portion and the spherical concave portion, the desired directivity is maintained and the shaft radial direction is maintained. To be rotatably engaged.

A plurality of annular concave portions are provided on the outer peripheral surface of the ball portion and an annular convex portion is provided on the inner surface of the spherical concave portion, or a spherical concave portion provided with a plurality of annular concave portions at the tip of the shaft portion is provided. Also, if the ball portion provided with the annular convex portion is provided in the polishing portion, the same operation and effect as those of the above-mentioned technical means can be obtained. However, from the viewpoint of productivity (workability), such a means as the above-mentioned means is obtained. The embodiment is preferable (claim 2).

[0009]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS. In the figure, reference numeral A denotes a polishing tool, reference numeral 1 denotes a shaft portion, reference numeral 2 denotes a polishing portion, reference numeral 3 denotes a joint means, and reference numeral B denotes a reciprocating hand-held polishing device.

As shown in FIGS. 1 and 2, a polishing tool A according to the present invention comprises a shaft 1, a polishing section 2, and joint means 3. The shaft 1 is made of a round bar-shaped metal member 11 formed by bending a predetermined angle from the vicinity of the tip.
A ball portion 32 described later is provided. Polishing unit 2
Paper, synthetic resin, sandpaper-shaped grinding stone portion 21 in which abrasive grains are fixed to a base material such as cloth, is made of an elastically deformable synthetic resin member such as nylon and Duracon, and has a rectangular shape in plan view. It is removably attached to the lower surface of the main body 22 via a buffer member 23 such as sponge or rubber. In addition, this buffer member
Although 23 is not always necessary, it is preferable to interpose 23 from the viewpoint of improving the adhesion to the surface W to be polished having minute irregularities and improving the polishing efficiency. A boss-shaped protrusion 24 is formed at the center of the upper surface of the main body 22, and the shaft 1 is formed at the center of the protrusion 24.
Spherical concave portion 31 that engages with ball portion 32 provided at the tip of
Is provided.

The joint means 3 comprises the above-mentioned spherical concave portion 31 and the ball portion 32. The spherical concave portion 31 is recessed so that the center of the ball portion 32 is located slightly lower than the upper surface level of the projection portion 24, and has a diameter such that it slides on a curved surface of the ball portion 32 described later. The spherical concave portion 31 is connected to the outside through the deepest portion at a predetermined angle in the circumferential direction (in 8 parallel directions with the long side or short side of the main body 22 and at equal intervals so as to intersect with each other; every 45 degrees). A plurality of annular concave parts 33
Is provided. By providing a plurality of annular concave portions 33 in this manner, the polishing portion 2 can be selected so as to be rotatable in a required direction in the axial direction. The ball portion 32 is
In the same direction as the bending direction of the shaft portion 1 and along the longitudinal center line of the shaft portion 1, a spherical shape having an annular convex portion 34 slidably engaged with the annular concave portions 33. Present.

In the joint means 3 constructed as described above, the main body 22 made of an elastically deformable synthetic resin member and the spherical concave portion 31 are integrally formed, and the entrance diameter is formed smaller than the diameter of the ball portion 32. By pressing the ball portion 32 against the spherical concave portion 31, the spherical concave portion 31 is elastically deformed and pushed and spreads, and the spherical concave portion 31, the ball portion 32, and the annular concave portion 33 parallel to the longitudinal direction of the main body 22 are formed. At the same time as the annular convex portion 34 is slidably engaged, the entrance of the spherical concave portion 31 is restored to the original state, and the ball portion 32 is held so as not to easily come out of the spherical concave portion 31. . The ball portion 32 is detached from the spherical concave portion 31 by pulling the shaft portion 1 with a required force. And the main body 22 thus engaged
The annular concave portion 33 parallel to the longitudinal direction and the annular convex portion 34, and the spherical concave portion 31 and the ball portion 32 suppress the rotation in the axial circumferential direction, and perform the grinding, and the grinding stone portion 21 and the grinding stone portion. The polishing section 2 having a main body 22 that supports the main body 21 is connected to the polishing section 2 so as to be rotatable in a shaft radial direction (in FIG. 1, a longitudinal direction of the main body 22).

Next, a reciprocating hand-held polishing apparatus B using such a polishing tool A will be briefly described with reference to FIG. This hand-held polishing apparatus B rotates the turbine b2 at a high speed by the compressed air ejected from the nozzle b1, so that the flexible connecting rod b4 eccentrically supported and eccentrically supported via the drive shaft b3 performs an eccentric rotation. Openable and closable chuck connected to connecting rod b4 via guide b5
b6 reciprocates based on the amount of eccentricity. The illustrated chuck portion b6 is a flat-split type in which a V-groove b7 is provided in the longitudinal direction, and includes a polishing tool A having a base formed in a rectangular cross section and a polishing tool A according to the present invention. Thus, both of the polishing tools having a round bar-shaped base can be held.

The polishing tool A configured as described above is used for the chuck b6 of the reciprocating type hand-held polishing apparatus B described above.
After the base side of the shaft portion 1 of the polishing tool A is clamped and attached, the polishing device B is driven, and the hand-held polishing device B is held as if holding a writing instrument, and the polishing portion 2 is attached to the surface W to be polished. When pressed, the polishing portion 2 connected to the shaft portion 1 via the joint means 3 described above rotates in the shaft radial direction, so that the grindstone portion 21 comes into surface contact with the surface W to be polished, and The reciprocating motion on the surface W to be polished is suppressed while suppressing the rotation in the direction, so that the polishing is performed efficiently. When polishing the surface W to be polished located at the corner portion W1 as shown in FIG. 4, the above-mentioned polishing tool A is attached to the annular recess 33 located at 45 degrees to the long side (or short side) of the main body. Is selected, and the spherical concave portion 31 and the ball portion 32 are engaged to press the polishing portion 2 against the surface to be polished W. When the polishing portion 2 is connected to the shaft portion 1 via the joint means 3 described above,
However, while maintaining its directionality, it rotates in the shaft radial direction to come into surface contact with the surface to be polished W and suppresses the rotation of the polishing unit 2 in the circumferential direction of the shaft. The polishing process is performed efficiently without intermittently contacting the vertical surface and reciprocating on the surface W to be polished without leaving an unprocessed portion.

Although the embodiment of the present invention exemplifies a polishing portion having a rectangular shape in a plan view, the present invention is not limited to this. The polygonal shape having a triangular shape, a square shape or a quadrangle or more, an elliptical shape, or Any shape such as an arbitrary shape having a free-form surface may be used. Furthermore, the corner portion of the polished portion having the illustrated rectangular shape in plan view may be formed into an R surface (curved surface), a C surface (chamfered shape), a combination of both, or a combination of the two. By making the dimensions of the surface and the C surface different for each corner, there is an advantageous effect that various shapes of the polished surface can be accommodated.

[0016]

As described above, the present invention has the following advantageous effects. According to the first aspect, the polishing portion connected to the shaft portion via the joint means rotates in the shaft radial direction to make surface contact with the surface to be polished and suppresses the rotation of the polishing portion in the circumferential direction of the shaft. Therefore, the desired region of the polished surface can be efficiently polished without leaving an unprocessed portion. Moreover, since the joint means can be selectively engaged in a required direction in the axial direction, the directionality of the polishing portion formed in an arbitrary shape is appropriately selected, and the desired shape of the surface to be polished and the corner of the polishing portion are selected. Since the polishing can be performed in accordance with the shape of the portion or the side portion, it is possible to easily cope with the surface to be polished formed in various shapes having various variations.
According to the second aspect, the main body supporting the grindstone portion is made of an elastically deformable synthetic resin member. The spherical concave portion provided integrally with the main body and having the annular concave portion and the annular convex portion provided at the tip of the shaft portion are provided. Since the joint means is configured with the provided ball portion, the number of parts is the same as that of the conventional ball joint type,
Moreover, since the structure is simple, the production cost can be kept low, and therefore, a polishing tool capable of efficiently polishing a desired surface to be polished can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a polishing tool according to the present invention.

FIG. 2 is a sectional view (A)-(A) in FIG. 1;

FIG. 3 is a partially enlarged view of a joint means.

FIG. 4 is an explanatory view showing a polished state of a surface to be polished at a corner;

FIG. 5 is a longitudinal sectional front view of a reciprocating type hand-held polishing apparatus.

FIG. 6 is an explanatory view showing a polished state of a polished surface on a corner using a conventional polishing tool.

[Explanation of symbols]

A: Grinding tool 1 ... Shaft 2 ... Grinding part 3 ... Joint means 21 ... Grindstone 22 ... Body 31 ... Spherical recess 32 ... Ball 33 ...
Annular concave part 34 ... Annular convex part

Claims (2)

[Claims] 1. A polishing section comprising a grinding stone section for performing polishing and a main body supporting the grinding stone section, and a shaft section connecting and supporting the polishing section suppresses rotation in a shaft circumferential direction. A polishing tool, wherein the polishing portion is connected via joint means for selectively rotating and detachably engaging the polishing portion in a required direction in the axial direction. 2. The apparatus according to claim 1, wherein the main body is formed of an elastically deformable synthetic resin member, and the joint means is provided integrally with the main body and is connected to the outside through a deepest portion at a predetermined angle in a circumferential direction. A spherical concave portion provided with an annular concave portion, and a ball portion detachably engaged with the spherical concave portion provided at an end of the shaft portion and having an annular convex portion slidably engaged with the annular concave portion on an outer peripheral surface. 2. The polishing tool according to claim 1, wherein the polishing tool comprises: