JP7222541B2 - Spare blade for electric scraper - Google Patents

Description

The present invention removes adhesive residues, nails, and tacker nails from the surface of building materials by attaching and fixing it to a drive source that performs reciprocating circular motion with a very small amplitude (rotational angle), generally called an "oscillating multi-tool". It relates to the structure of a scraper replaceable blade for removing all such as.
In the following description, the term "arc vibration" is used to mean "reciprocating circular motion with a small amplitude (rotational angle)".

A scraper is a tool used to thinly scrape the outer surface or surface of an object, and is one of the most frequently used tools in construction work, especially in renovation work to beautify and strengthen existing facilities. For example, when renovating a room, the existing wallpaper or gypsum board is removed and replaced with a new one. At that time, residues such as nails (nails, tucker nails, etc.) and adhesives are usually left behind after the wallpaper or gypsum board is roughly peeled off. Therefore, in order to proceed with the work, it is essential to remove the residue (background adjustment work), which is unexpectedly troublesome.

To remove adhesive residues, if nails or tacker nails are protruding from the surface, remove them with a nail puller or hit them with a hammer, and if solidified adhesive is attached, scrape it off with a scraper. is the basis.
In other words, the basis of work is to carry a nail puller, a hammer, and a scraper, determine the type of adhesive residue, and select the appropriate tool from among them.
A scraper is a tool that presses a knife edge with a sharp tip against an object, so it is suitable for removing adhesive, but it is dangerous because the blade may be damaged if it hits a nail that has been driven into it. . Therefore, even in the work of pressing against the solidified adhesive and peeling it off, the work must be done while checking whether the nail heads are hidden under the adhesive. Of course, if a nail is found, it is necessary to avoid it or temporarily stop the work and switch to the nail removal work.

Nail pullers and hammers are used to handle nails, but when the nails are covered with adhesive, neither nail pullers nor hammers can be used. In such a case, it is difficult to remove the adhesive residue with a nail puller or a hammer, so it is necessary to remove it with a pliers or nippers.

JP-A-5-202621

Therefore, in order to carry out the work efficiently, various kinds of tools are required, and the work has been done while constantly worrying about whether there are any hidden nails or the like.

On the other hand, there is a tool called an oscillating multi-tool. In this method, cutting, scraping, polishing, and grinding are performed by attaching and fixing a replaceable blade or pad to a drive source that vibrates in an arc. Among such replaceable blades, those having sharpened knife edges are commercially available as scrapers.

As this blade is pushed into the trace of adhesive, the adhesive can be removed somewhat easily due to the combination of the pushing force and the arc vibration. However, even if it is a power type, there is no change in the trouble caused by encountering a nail or the like.

Therefore, the present inventors have made intensive research in view of the above points, and have finally completed the present invention. A replacement blade for a scraper that removes a certain adhesive residue and protruding metal, the thickness of the blade is constant at the tip, and the cutting teeth formed are cut in a plane perpendicular to the front and back surfaces of the blade. , and clams are not provided.

That is, first of all, the disposable blade of the electric scraper according to the invention does not have a sharp tip. In addition, the thickness of the tip portion is constant, and so-called "clams" are not attached. Furthermore, the cutting teeth are cut in a plane perpendicular to the front and rear surfaces of the blade, as if cutting with a jigsaw, and the teeth are not slanted. In other words, it can be said that it is a spare blade having a cutting tooth structure that cannot be called a saw, although it is provided with something like saw teeth.

As described above, while having the ability to scrape off the adhesive residue, it is also equipped with strength enough to cut nails and the like while proceeding.

First, the reason for having the ability to scrape off adhesive residue is explained. In the case of a conventional scraper with a knife edge, the wedge-shaped tip fits into the adhesive residue, and the wedge tip widens the gap between the adhesive residue and the base material. Easy to adhere to.
On the other hand, the disposable blade of the present invention does not have a knife edge. It has incisors instead. Therefore, the cutting teeth oscillate in an arc, so that the adhesive residue advances while breaking the bottom portion (the portion near the base material). The thickness of the blade is often smaller than the thickness of the adhesive residue, and in such cases, the blade penetrates into the residue while gouging the foot of the adhesive residue. And under such circumstances, it is unlikely that the gouged residue will adhere to the blade.

Next, the reason why it has enough strength to go forward while cutting a nail or the like even if it comes across is explained. The saw blade has serrations, each serration usually consisting of a face that cuts non-perpendicular to the broad face of the saw blade. However, in the present invention, the scraper has serrated cutting teeth, which consist only of surfaces perpendicular to the broad surface.
That is, cutting teeth are formed by cutting one side surface of a flat thin plate in a plane perpendicular to the side surface. The blade as a whole will oscillate in an arc, but at that time, the surface that constitutes the incisor will come into contact with the nail or the like while catching it from the front, reducing the possibility of chipping. In addition, since it does not have a knife edge, it has a very high strength.

In addition, claim 2 proposes that the planar shape of the incisors is a shape in which isosceles triangles of the same shape are connected. This shape is called a "zigzag shape". The zigzag shaped cutting teeth shall be referred to as "zigzag cutting teeth". By making the cutting teeth in a zigzag shape, the cutting ability becomes equal in the right and left directions when the blade is vibrating in an arc, so that the operator does not feel discomfort during work.

In the present invention, even if a nail or the like is encountered during the operation, the nail or the like is cut by cutting the nail or the like. Therefore, the strength (hardness/toughness) of the incisor portion is preferably high. Such improvements may be added as appropriate, and the present invention does not preclude such improvements.

The electric scraper blade according to the present invention is a scraper blade that removes adhesive residues and protruding metals on the surface of building materials by attaching and fixing to a drive source that performs a reciprocating circular motion with a small amplitude. , The thickness of the blade is constant at the tip portion, and the formed cutting teeth are cut in a plane perpendicular to the front and back surfaces of the blade, and are characterized in that no clams are provided, This is an extremely advanced invention having effects as described below.

(1) Although it is a scraper, it has cutting teeth like a saw blade, so it can remove both adhesive residue and protruding metal.
(2) Since the cutting teeth are cut perpendicular to the front and back surfaces of the blade, chipping of the blade is less likely to occur.

1 is a schematic plan view showing an example of a replaceable blade for an electric scraper according to the present invention; FIG. (a) and (b) show the vicinity of cutting teeth of a replaceable blade of an electric scraper according to the present invention, (a) being a schematic plan view and (b) being an enlarged view of part A thereof. (a) and (b) show the vicinity of the cutting teeth of the replaceable blade of the electric scraper according to the present invention, (a) being a schematic front view and (b) being an enlarged view of the B portion thereof. (a) and (b) show an example of the surface on which the replaceable blade of the electric scraper according to the present invention works. is shown. 1 is a schematic perspective view showing an example of an oscillating multi-tool to which a replaceable blade of an electric scraper according to the present invention is to be attached; FIG.

FIG. 1 shows an example of a replaceable blade 1 for an electric scraper according to the present invention (hereinafter referred to as "replaceable blade 1 of the present invention"). The replaceable blade 1 of the present invention is for an oscillating multi-tool, and as is clear from the drawing, the replaceable blade 1 of the present invention in this example is formed in a zigzag shape so that the cutting ability when reciprocating is equal to the reciprocating motion. with zigzag cutting teeth 2 that

On the side opposite to the side on which the zigzag cutting teeth 2 are provided, there is provided a connecting mechanism section with the oscillating multi-tool. In this example, a projection (not shown) on the vibrating multi-tool side is fitted into the connecting hole 3 so as to be combined. However, there are various structures for the connecting mechanism, and the structures are not limited to those shown in the drawings. FIG. 5 shows an example of a state in which the replaceable blade 1 of the present invention is being attached to an oscillating multi-tool.

The zigzag cutting teeth 2 are shown in FIGS. 2(a) and 2(b), which are plan views and enlarged views of part A, and FIGS. 3(a) and 3(b), which are front views and enlarged views of part B. , the end of one side of the blade is dressed to have a shape cut only on a plane perpendicular to the wide plane 4 . As is clear from FIG. 2, the zigzag cutting is formed by continuously repeating isosceles of the same shape with the tooth tip 21 as the vertex. If the incisors are zigzag, the cutting ability does not change between forward and backward movements. Due to the structural feature that the incisors slip when moving) and do not slip on the other side, the oscillating multi-tool behaves in such a way that it warps to one side from the pushing direction even though it is being pushed. This is especially true if the adhesive marks are extensive and the oscillating multi-tool drives through them. Therefore, when the incisors are zigzag as in the present invention, handling is facilitated.

Furthermore, a saw blade usually has a "set", but as is clear from FIG. Because there are no short-necked clams, the risk of the incisors damaging the substrate (body surface, wall surface, etc.) during scraper work is greatly reduced.

4(a) and 4(b) show a state in which the decorative board B is stretched over the wall A [FIG. 4(a)] and a state in which the decorative board B has been removed [FIG. 4(b)]. be. The state of FIG. 1(b) is the working portion of the replaceable blade 1 of the present invention. In the state shown in FIG. 4(b), the adhesive marks X of various sizes and the heads of the tucker nails Y are exposed. Both the adhesive and the tucker nail are used to join the wall A and the decorative board B, and when the decorative board B is removed, the head of the tucker nail Y is approximately the thickness of the decorative board B. It is away from the wall body A surface. Also, when peeling off, part of the decorative board B may remain on the adhesive side.
As for the method of removing the decorative board B, any method can be used as long as it can be indicated by the phrase "peel off", and the present invention is not involved. I will not go into detail.

For the peeling work, simply turn on the vibrating multi-tool equipped with the replaceable blade 1 of the present invention and move it on the wall A toward the adhesive mark X or the tacker nail Y. Since cutting of metal members such as nails is also assumed, the material must have not only hardness but also toughness.

1 Spare blade of electric scraper according to the present invention 2 Zigzag cutting teeth 21 Tooth tip 3 Connection hole 4 Wide surface (of saw blade) A Wall body B Decorative board X Adhesive trace Y Tucker nail

Claims (2)

A replacement blade for a scraper that removes adhesive residue and protruding metal on the surface of building materials by attaching and fixing it to a drive source that makes reciprocating circular motion with a small amplitude.The thickness of the blade is constant at the tip. 1. A spare blade for an electric scraper, characterized in that the formed cutting teeth are cut in a plane perpendicular to the front and back surfaces of the blade and are not provided with clams. 2. The replaceable blade for an electric scraper according to claim 1, wherein the planar shape of said cutting teeth is a shape in which isosceles triangles of the same shape are connected.

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