JPH0432216Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a hand tool for finishing, for example, a machine workpiece or removing rust from a metal surface.

(Conventional technology) Recently, advances in machine tools have made it possible to perform high-precision machining, but the final finishing of the resulting machined product still relies on polishing with coated abrasive paper. is the reality. In particular, when it is necessary to smoothen surfaces to be polished such as concave or convex curved surfaces, such as molds, or the inside of narrow gaps, manual polishing by workers using coated abrasive paper is mainstream. It is. In addition, polishing with an electric rotating brush is common for removing paint films and removing rust from metal surfaces, but when removing rust from areas where the electric rotating brush cannot penetrate, hand wire brushes or coated abrasive paper are used. It relies on the manual work of the workers who used it.

However, in polishing using coated abrasive paper, the operator presses his or her fingers from the back side of the coated abrasive paper and applies polishing pressure using finger pressure. It takes a lot of effort and requires great skill to polish uniformly. In addition, because polishing is performed by wrapping coated abrasive paper around the tip of a rod to polish areas that cannot be reached with fingers, it is not possible to apply a constant polishing pressure to the surface to be polished. In addition, a mechanical workpiece that has been chucked on a machine tool such as a lathe may be rotated, and a coated abrasive paper is pressed against the mechanical workpiece to polish it, but there is a risk of touching the rotating mechanical workpiece directly with fingers. This is dangerous work. moreover,
The above-mentioned hand-type wire brush has a structure in which a large number of wires are embedded in a part of the handle, and the brush surface cannot be strongly pressed against the surface to be polished, and if the wires become worn, the handle cannot be removed. It is uneconomical because the entire wire brush containing it is discarded.

(Problems to be solved by the invention) As mentioned above, conventional coated abrasive paper and wire brushes cannot achieve uniform polishing, are not easy to use, are dangerous, and are uneconomical. There is.

This invention was made with attention to the above-mentioned circumstances, and its purpose is to be able to uniformly polish concave or convex curved surfaces without requiring any skill. Moreover, the object is to provide a hand tool that is easy to use, highly safe, and economical.

[Structure of the idea]

(Means and effects for solving the problem) This invention includes a grip that can be held by an operator, a first support rod and a second support rod provided at one end of the grip, and a first support rod and a second support rod that are provided at one end of the grip. An elastic core material whose one end is hooked to the first and second support rods and extends along the longitudinal direction of the grip part, and a polishing part detachably attached to the outer peripheral surface of the core material. It includes an endless polishing body and a presser bar that is provided at one end of the grip part and presses down a part of the endless polishing body from above, and even if the core material is elastically deformed, the presser bar can perform endless polishing. A part of the body is pressed down from above to apply tension to the endless polishing body, and this tension allows the endless polishing body to be held fixedly.

(Embodiment) Hereinafter, a first embodiment of this invention will be described with reference to FIGS. 1 to 4.

1 and 2 show the entire hand tool, and 1 is a grip portion. A first support rod 2 and a second support rod 3 formed by bending a metal rod are attached to one end of the grip portion 1. At the ends of the support rods 2 and 3, hook parts 4 and 4 are formed which are bent in a direction perpendicular to the longitudinal direction of the grip part 1.

On the other hand, 5 is an endless coated abrasive paper serving as an endless abrasive body, which is hooked to the first and second support rods 2 and 3 via a core material 6 extending along the longitudinal direction of the grip part 1. has been done. That is, the core material 6 is placed on the upper surface of a band-shaped soft urethane rubber 7 having approximately the same width as the hooking portions 4, 4.
A metal plate spring 8 is attached from one end of the urethane rubber 7 to the other end, and horizontal hooking holes 9 are provided at one end of the urethane rubber 7. . One end of the core member 6 is attached to the first and second support rods 2 and 3 by hooking the hooking holes 9 to the hooking portions 4 and 4. In this case, the leaf spring 8 is curved in advance in an arc shape so that both ends are higher than the center part when viewed from the side, and the urethane rubber 7 is also curved in an arc shape following the leaf spring 8. Therefore, the upper surface of the core member 6 is formed with a concave arcuate surface 6a with a lower center portion, and the lower surface is formed with a convex arcuate surface 6b with a higher center portion.
Furthermore, the endless coated abrasive paper 5 includes an endless belt 10 having approximately the same width as the core material 6;
The endless belt 10 has a polishing portion 12 made of abrasive grains 11 bonded to the outer surface thereof. The endless coated abrasive paper 5 is removably attached to the core material 6 by fitting onto the outer peripheral surface of the core material 6. In this case, the distance from one end of the core material 6 to the other end is slightly longer than the distance from one end to the other end of the endless coated abrasive paper 5, and when the endless coated abrasive paper 5 is attached to the core material 6, the distance between the core material 6 6 is elastically deformed, the core material 6 is attached with a narrowed distance from one end to the other end, and after attachment, a predetermined tension is applied to the endless coated abrasive paper 5 due to the elastic restoring force, and this tension causes the endless abrasive paper 5 to be The coated abrasive paper 5 is held fixedly.

A presser bar 13 is attached to one end of the grip portion 1. This presser bar 13 is also formed by bending a metal rod-shaped body,
a first arm portion 14 extending along the longitudinal direction of the grip portion 1; a second arm portion 15 bent obliquely downward from the end of the first arm portion 14;
From the end of this second arm portion 15 to the grip portion 1
Presser part 1 bent in a direction perpendicular to the longitudinal direction of
It consists of 6. This holding portion 16 has approximately the same width as the endless coated abrasive paper 5, and is located at the center of the endless coated abrasive paper 5 in the longitudinal direction.

In the hand tool configured as described above, for example, an operator grasps the grip part 1 with one hand and holds the core member 6.
The polishing portion 12 of the endless coated abrasive paper 5 located on the lower surface is pressed against the surface to be polished. In this state, by reciprocating the endless coated abrasive paper 5 along the longitudinal direction, the surface to be polished is polished by the polishing section 12.
It can be polished by. At this time,
Even if the surface to be polished is a concave curved surface, since the convex arcuate surface 6b is formed on the lower surface of the core material 6,
Polishing pressure can be uniformly applied to the surface to be polished. If the surface to be polished is a convex curved surface, the core material 6 is turned over and the concave arc surface 6a is used; if the surface is flat, it is formed into a flat shape by a leaf spring 8 as shown in FIG. If a complex convex curved surface is used, a leaf spring 8 is used as shown in FIG.
By using core materials 6 with different shapes depending on the shape of the surface to be polished, such as using a core material 6 curved to match the complex convex curved surface, etc. Even the surface to be polished can be polished uniformly without requiring any skill. Moreover, when the endless coated abrasive paper 5 is pressed against the surface to be polished, the core material 6 is elastically deformed as shown in FIG. Even if the distance between one end and the other end becomes narrower and a part of the endless coated abrasive paper 5 separates from the outer peripheral surface of the core material 6, the endless coated abrasive paper 5 is
The central part of the endless abrasive coated paper 5 can be pressed down from above, and tension can be applied to the endless coated abrasive paper 5 by the pressing force of the presser rod 13. Therefore, the endless coated abrasive paper 5 can be fixedly held on the core material 6 by this tension, and the endless coated abrasive paper 5 can be prevented from shifting or coming off from the core material 6. Furthermore, since the endless coated abrasive paper 5 has a narrow width, it is possible to easily abrade every corner of the inside of a narrow gap or a concave groove. Furthermore, if the abrasive portion 11 of the endless coated abrasive paper 5 is worn out due to the above-mentioned abrasive process and the abrasive ability is reduced, the distance from one end of the core material 6 to the other end is narrowed, and the endless coated abrasive paper By shifting 5 in the direction of the arrow, the new polishing section 12 located on the top surface can be guided to the bottom surface side, and the worn polishing section 12 located on the bottom surface can be moved to the top surface side. Therefore, when the polishing portion 12 around the entire circumference is worn out, it is only necessary to remove the endless coated abrasive paper 5 from the core material 6 and replace it with a new coated endless abrasive paper 5, which is economical. Also,
The endless coated abrasive paper 5 is held in its center by a presser rod 13.
Since the polishing member 12 is pressed from above by the polishing member, the pressing force of the polishing part 12 against the surface to be polished becomes strong, and it is possible to polish the surface more uniformly.

FIG. 5 shows a second embodiment of this invention.

In this embodiment, the leaf spring 8 of the core material 6 is embedded inside the soft urethane rubber 7 in the first embodiment.

Also, Figures 6 to 10 show the third part of this invention.
An example is shown below.

This embodiment differs from the first embodiment in that the leaf spring 8 of the core material 6 is provided across the longitudinal direction of the soft urethane rubber 7 and is curved in an arc shape with respect to the width direction of the urethane rubber 7. It is.
In such a configuration, if the surface to be polished is a concave curved surface, it is polished into an arc shape by the leaf spring 8 so that both ends are higher than the center, as shown in FIGS. 6 and 7. If a curved core material 6 is used, or if it is a convex curved surface, the arc-shaped core material 6 is used upside down as shown in FIG. 8, and if it is a flat surface, it is used by turning it over as shown in FIGS. As shown, a core material 6 formed into a flat shape by a leaf spring 8 may be used. With this configuration, not only can the intended purpose of this invention be achieved, but also because the leaf spring 8 is curved in an arc shape with respect to the width direction of the soft urethane rubber 7, the core material 6 can be The bending strength in the thickness direction is increased, so that the surface to be polished can be polished more uniformly.

Furthermore, FIG. 11 shows a fourth embodiment of this invention.

In this embodiment, the core material 6 is replaced with a soft urethane rubber 7 and a hard urethane rubber 17 in the first embodiment.
By forming the hard urethane rubber 17 into a predetermined shape in advance, the core material 6 is formed into a predetermined shape.

In addition, in each of the above embodiments, the endless abrasive coated paper 5 was used as the endless abrasive body, but
An endless brush having a large number of wires implanted on the outer surface of the endless belt 10 may be used, and an endless nonwoven fabric or the like may also be used with appropriate replacement. It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effect of idea]

As explained above, according to this invention, even when polishing concave or convex curved surfaces, it can be polished uniformly without requiring any skill, and it is easy to use and highly safe. At the same time, it is possible to provide an economical hand tool.

[Brief explanation of drawings]

Figure 1 is a perspective view of a hand tool showing the first embodiment of this invention, Figure 2 is a side view of the hand tool, Figure 3 is a side view of the core, and Figure 4 is a side view of the core. 5 is a side view of a hand tool showing a second embodiment of this invention, FIG. 6 is a side view of a core material showing a third embodiment of this invention, and FIG. 7 is a side view of the core material as well. 8 is a side view of the core material, FIG. 9 is a sectional view of the core material, FIG. 10 is a partial sectional view of the core material, and FIG. 11 is a fourth diagram of the core material. It is a side view of the hand tool which shows the Example of this. DESCRIPTION OF SYMBOLS 1... Grip part, 2... First support rod, 3... Second support rod, 5... Endless abrasive coated paper (endless abrasive body), 6... Core material, 12... Polishing part, 1
3... Presser bar.

Claims (1)

[Scope of utility model registration request] A grip that can be held by an operator, a first support rod and a second support rod provided at one end of the grip, and one end of which is hooked to the first and second support rods. an elastic core extending along the longitudinal direction of the grip; an endless polishing body removably attached to the outer peripheral surface of the core and having a polishing portion on the outer surface; and an endless polishing body provided at one end of the grip A hand tool characterized by comprising a presser bar that presses down a part of the endless polishing body from above.