JPH0438538B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is capable of sharply polishing concave surfaces with an acute cross section, such as rib grooves on the body of an automobile, and other angles, as well as polishing various curved surfaces. This invention relates to an abrasive paper holder that is also capable of polishing.

(Prior Art and Problems to be Solved) Conventionally, when polishing a concave surface with an acute cross section, it has been common practice to wrap abrasive paper around a piece of wood or a spatula. However, since it is difficult to securely fix the abrasive paper to a piece of wood, etc., there is a risk that the abrasive paper may slip during polishing work, and the curvature of the surface to be polished often does not match, resulting in poor workability. Moreover, uniform polishing was difficult and the finished surface of the polished surface was insufficient. Furthermore, when a piece of wood is used as a stand, there is a risk that water will permeate into the wood piece during the wet sanding process, causing the wood piece to expand and cause distortion during the work. Furthermore, when polishing curved surfaces, various problems such as poor workability, poor surface finish, and damage to the abrasive paper arise due to insufficient fixation of the polisher to the tool.

(Means for Solving the Problems) However, in the present invention, a surface assener is layered on the peripheral surface of a hard base having a triangular cross section, leaving one corner, so that the abrasive paper covering the corner is applied to the surface of the peripheral surface of the base. Since it is firmly fixed by the assener, there is no risk of it slipping off, and since the abrasive paper and the base surface are in direct contact, it is possible to sharply and efficiently polish recesses and other corners with acute cross-sections. Furthermore, since at least one side of the hard base has an arcuate cross-section, even curved parts can be easily polished, thus solving the problems of the prior art.

That is, the present invention provides a method in which at least one side of a hard base having a predetermined length and a triangular cross section has a curved surface similar to the surface to be polished, and one corner of the hard base has two faces forming the minimum corner of the hard base. The abrasive paper holder has a narrow plane parallel to the top edge, and a surface assener is attached to the circumferential surface of the hard base other than one corner. Further, the hard base is made of metal or hard synthetic resin. Next, the curved surface similar to the surface to be polished has a convex arc-shaped cross section or a concave arc-shaped cross section. Further, the layered portion of the surface fastener on the hard base is formed to be lower than the non-layered portion by the thickness of the surface fastener.

(Function) Since the present invention has the above configuration, even when polishing a concave surface with an acute cross section, the abrasive paper and the surface to be polished can be brought into contact reliably and accurately. Furthermore, the support is rigid and there is no risk of deformation during use.

(Example) The present invention will be described below based on an example shown in the drawings. The acute edge 1 of a base 3 (for example, length 120 mm) made of metal (for example, aluminum) has a substantially triangular cross section with an acute edge 1 at one corner and a convex arcuate surface 2 (for example, radius of curvature 22 mm) at one corner. A surface assener 4 is layered on the entire circumferential surface with a small width left. The acute edge 1 and the two planes 5 and 6 of the base 3 are:
They are connected to each other via thick stepped portions 7 and 8 of the surface fastener. Therefore, the exposed surface 9 on which no surface attenuator is layered and the upper surface of the surface attenuator 4 are flush with each other. Further, a narrow flat surface 10 is provided on the acute edge 1 of the base 3.
(width approximately 2 mm), and a cavity 11 is provided in the center.

A method of polishing a corner using the abrasive paper holder A shown in the above embodiment is as follows.

The exposed end surface 9 of the abrasive paper holder is covered with an abrasive paper 12, and both back surfaces of the abrasive paper 12 are fixed to the surface assener 4. As shown in FIG.
can be fixed to. Thereafter, as shown in FIGS. 4 and 5, the acute edge side of the abrasive paper holder A is applied to the surface to be polished (corner) 14, and polished in the usual manner.

In this case, the hard base 3 and the back surface of the abrasive paper 12 are in direct contact with the acute edge side of the abrasive paper holder A. Therefore, not only can the force applied to the abrasive paper holder A be transmitted to the abrasive paper 12 without waste during polishing, but also the surface of the abrasive paper is not deformed, so that the abrasive paper in the portion corresponding to the acute edge 1 of the abrasive paper holder A is The shape can be made to follow the acute edge 1 as much as possible, and the corner 14 can be sharply ground.

In the above embodiment, the narrow plane 1 is attached to the acute edge 1.
0, as shown in FIG. 6, by bringing the narrow flat surface 10 into contact with the bottom surface of the rib groove 15 and polishing it, the rib groove 1, which has been extremely difficult to form in the past, is removed.
5 can be easily polished.

Further, in the above embodiment, since the tip exposed surface 9 and the upper surface of the surface assener 4 are flush with each other, the surface of the abrasive paper fixed to the area is flat, and the surfaces other than the acute edges are covered with the surface assener 4. Therefore, it is elastically supported. Therefore, when polishing is carried out by bringing the abrasive paper into contact with the flat surface 16 that is continuous with the corner 14 as shown in FIG. Therefore, there is no fear that a difference in level due to polishing will occur between the portion 16a of the plane 16 where the abrasive paper contacts and the portion 16b where the abrasive paper does not contact.

Furthermore, in the embodiment described above, since the cavity 11 is provided, the handle 17 can also be attached via the cavity 11.

Note that it is not an essential requirement that the narrow plane 10 and the cavity 11 be provided and that the tip exposed surface 9 and the upper surface of the surface fastener 4 be flush with each other.

Next, according to the abrasive paper holder A of the above embodiment,
By fixing the abrasive paper 12 to the convex arc-shaped surface 2,
The indentation 18 as shown in FIG. 7 can be polished. In this case, the abrasive paper holder A will rotate in the direction of the arrow in FIG.
Since it is fixed to the surface assener 4, there is no risk of the abrasive paper shifting during work. Incidentally, the surface having an arcuate cross section in this invention is not limited to the surface having a convex arcuate cross section as shown above, but may be a concave arcuate surface 19 (FIG. 8) which can be used to polish a curved convex portion.
As shown in FIG. 10, the two surfaces may have an arcuate cross section. Further, the curvature of the arcuate surface is appropriately selected depending on the object to be polished.

Further, as the material of the hard base in the present invention, in addition to metals such as aluminum, ABS resin and other hard synthetic resins can be used. In addition, if the abrasive paper fixed to the hard base is one with a raised cloth attached to the back side, there is no risk of the abrasive paper being damaged during use.

(Effects of the Invention) That is, according to the present invention, since the surface assener is layered on the circumferential surface of the hard base having a triangular cross-sectional shape except for one corner, the abrasive paper can be bent reliably and sharply as a holder. It can be fixed by As a result, it is now possible to sharply and efficiently polish recesses and other corners with acute cross sections, and it is also possible to easily polish the rib grooves of automobile bodies, which were extremely difficult to polish completely in the past. can. Furthermore, since the tip of the hard base is exposed, a sharp angle can be obtained at the tip, and the force applied to the polishing holder can be transmitted to the polishing surface without waste. Furthermore, since the cross section of at least one side of the hard base is arcuate,
Curves can also be easily polished, and the same tool can be used for both corner polishing and curve polishing.

It should be noted that the abrasive paper holder of the present invention is not limited to the material to be polished, and it goes without saying that metal, wood, synthetic resin, and other suitable materials can be used.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a perspective view with a part of the surface assener omitted, Fig. 3 is a partially enlarged sectional view of the abrasive paper fixed, and Fig. 4. 7 to 7 are side views showing the state of use, and FIGS. 8 to 10 are sectional views of other embodiments in which the surface fastener is omitted. 1...Acute edge, 2...Convex arcuate surface, 3...Base,
4... Surface assener, 9... Exposed tip surface, 10...
...Narrow plane, 11... Cavity, 12... Abrasive paper,
19... Concave arc surface.

Claims (1)

[Scope of Claims] 1. At least one side of a hard base having a predetermined length and a triangular cross-section has a curved surface similar to the surface to be polished, and one corner of the hard base forms the minimum corner of the hard base. An abrasive paper holder comprising two narrow flat surfaces parallel to the top edge, and a surface assener layered on the peripheral surface other than one corner of the hard base. 2. The abrasive paper holder according to claim 1, wherein the hard base is made of metal or hard synthetic resin. 3. The abrasive paper holder according to claim 1, wherein the curved surface similar to the surface to be polished has a convex arc-shaped cross section or a concave arc-shaped cross section. 4. The abrasive paper holder according to claim 1, wherein the layered part of the surface tensioner on the hard base is formed to be lower than the non-layered part by the thickness of the surface tensioner.