A single-edged Reuleaux triangular circular saw blade to be attached to an electric circular saw.

Abstract

This machine accurately cuts foamed resin-based architectural insulation material that is surface-coated with a thin aluminum film or plate while minimizing dust generation. [Solution] A circular saw blade with a Reuleaux triangle shape and a single-edged sharpened cutting edge as shown in Figure 1 is attached to a handheld electric circular saw for woodworking, and used to cut foamed resin-based building insulation material that is surface-coated with an aluminum thin film or plate.

Description

[Technical field]

[0001] This relates to an electric circular saw blade that cuts architectural foam resin insulation material covered with an aluminum thin film, thin plate, or fiber sheet using a handheld electric tool, while suppressing dust. [Background technology]

[0002] When cutting foamed resin insulation for construction using a conventional handheld electric tool, an electric circular saw, dozens of saw blade-like hard chips are placed on the outer periphery of a circular metal plate. For example, for a 1mm metal plate, the hard chips are extended to the left and right to create a cutting width of 1.8mm. In this case, cutting a 50mm thick foamed resin insulation material with a cutting distance of 910mm generates hundreds of thousands of dust particles. In a day's work volume, this amount exceeds 100 times. This large amount of dust can be harmful to the health of workers, and cutting on the roof of an architect's house is also known to be dangerous because the dust can cause workers to slip. The dust generated by cutting foamed resin insulation material is light and fine, so it scatters when the wind blows, causing a nuisance to neighbors, and cleaning up takes a lot of time and effort.

[0003] Although power tool manufacturers and peripheral equipment manufacturers around the world have some products that deal with dust, it is still an unsolved problem. There are methods to cut without generating dust using hand tools such as cutter knives, but cutting by hand is slow and the cutting angle is extremely inaccurate, making it difficult to cut according to the roof slope and resulting in poor workmanship, so cutting is generally done with an electric circular saw, which is fast and has an accurate cutting angle. Summary of the Invention [Problem to be solved by the invention]

[0004] One way to reduce dust when cutting foamed resin insulation for construction is to attach a Reuleaux triangular blade to an electric circular saw. A normal tipped circular saw blade has dozens of saw-shaped hard tips on the outer periphery of a circular metal plate, which rotates and scratches the workpiece as it rotates, but a Reuleaux triangular blade cuts into the workpiece as the blade slides in as it rotates. This can reduce dust from thermally melted foamed resin insulation for construction to less than one percent. With a Reuleaux triangular blade, the loss of foamed resin insulation due to cutting for every 1mm of metal plate is about 0.6mm, and the remaining 0.4mm is the cutting resistance. The remaining 0.4mm is not a problem with ordinary foamed resin insulation for architectural use, but with foamed resin insulation for architectural use covered with a thin aluminum film or plate, there is no reduction in thickness due to cutting of the thin aluminum film or plate, and the 1mm thickness of the circular saw blade becomes a cutting resistance that causes the electric circular saw to lose its ability to move in a straight line. The present application aims to provide an electric circular saw blade capable of cutting in straight lines even foamed resin-based insulation materials for construction that are surface-coated with a thin aluminum film or plate. [Means for solving the problem]

[0005] The aluminum thin film / sheet attached to the foamed resin insulation material for construction is divided into a flat side that is not subjected to cutting resistance and an inclined side that pushes aside the cutting resistance, and by grinding it into a single-edged blade with the flat end as the cutting edge, it becomes possible to maintain the straightness of the electric circular saw.

[0006] There is a method of adjusting the saw blade called "relaxing" for saws that have existed since ancient times and for modern rotary blade electric circular saw blades. The tip of the saw blade is extended to the left and right (set), and the flat surface of the metal plate of the saw blade is made thinner in advance, because even slight distortion or bulging of the flat surface of the metal plate of the saw blade generates unnecessary resistance when cutting. For electric circular saw blades, the metal plate is 1mm, and the tip is extended to the left and right 0.4mm (set) for a total cutting width of 1.8mm, making it easier to pass through a 1mm metal plate. In this application, the cutting width of the metal plate is 1 mm and 0.6 mm or less, so the blade is single-edged, and the flat surface is completely punched out to create many holes and grooves that create hollows, thereby reducing the cutting resistance of the flat surface of the metal plate. If the area of ​​the flat surface is halved, the probability of distortion and swelling is also halved, and friction is also halved. In addition, the holes and grooves of the electric circular saw blade are known to have the functions of cooling and heat dissipation by passing air through them, saving power by reducing the weight of the metal plate, and cushioning sudden loads on the cutting edge, but in this application, they also serve to indicate the distance from the center. Effect of the Invention

[0007] When cutting architectural foam resin insulation material covered with thin aluminum films or plates, workers can complete the work without being exposed to large amounts of dust.

[0008] When cutting architectural foam resin insulation covered with thin aluminum films or plates, workers can significantly reduce cleaning time. [Brief description of the drawings]

[0009] [Figure 1] From the left, the plan view, the cross section, and the enlarged view of the single blade in the circle on the right. Reference number 1 is the hole for attaching the metal plate circular saw blade to the electric circular saw, and is the inner diameter according to the Japanese Industrial Standards. In handheld electric circular saws for woodworking with an outer diameter of 100 mm or more but less than 200 mm, the inner diameter is often 20 mm in Japan. In the United States, 5 / 8 inches = about 16 mm is common regardless of the outer diameter. Reference number 2 is a completely punched hollow groove, and indicates each intermediate distance from the center of rotation to the tip of the blade. Conventional engravings or paint printing on the surface of metal plates disappear due to friction and become invisible due to the adhesion of resin and rust, but the groove of this application is hollow, so it does not disappear due to friction, does not adhere to resin or rust, and does not become invisible. It is generally called a slit. Reference number 3 is the tip of the apex and has the shape of a single blade. Reference number 4 is the tip of the outer periphery and has the shape of a single blade. In this application, it is used as the name "single blade" generally used for kitchen knives. Number 5 is a completely punched hollow hole. The effect is the same as number 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] This involves attaching a single-edged triangular circular saw of the present invention to a hand-held electric circular saw for woodworking and rotating it to cut the material to be cut, which is a foamed resin insulation material for construction that is surface-coated with an aluminum thin film or plate.

[0011] It is difficult to build buildings such as houses exactly according to theoretical values, and errors of a few millimeters will occur. Handheld circular saws for woodworking can be carried and used by people, so they can cut foam resin-based architectural insulation that has already been applied to roofs and walls of buildings, making it possible to fine-tune the shape and dimensions of the insulation and eliminating errors. EXAMPLES

[0011] The Reuleaux triangular circular saw blade was invented and used 21 years ago. During use, we have repeatedly tested the blade against wood and nails, which are not intended for cutting, to explore the dangers and problems involved, but we have not yet seen any damage or deformation. However, it was found that the straightness of the blade is lost when using foamed resin-based building insulation materials that are covered on one or both sides with thin aluminum films or plates, in order to improve the performance of conventional foamed resin-based building insulation materials. To overcome this, the blade edge is formed and ground to a single edge, allowing the blade to maintain straightness. [Industrial Applicability]

[0012] Demand for foamed resin insulation materials for construction is increasing due to international trends to reduce the energy consumption for heating and cooling of buildings and reduce the environmental burden, such as the ZEH initiative by the Agency for Natural Resources and Energy in Japan and the mandatory construction of highly insulated homes in the UK. However, cutting with an electric circular saw is common for cutting quickly and accurately, and it is a well-known fact in Japan and around the world that workers are troubled by large amounts of dust. As a countermeasure for the cutting of architectural foamed resin insulation, various power tool companies around the world have developed and sold jigsaw blades, table circular saw blades, and specialized power tools. However, these tools fall far short of the standards in terms of cutting speed, accuracy of cutting angle, and ability to suppress dust when cutting architectural foamed resin insulation, which is a heat-melting material. Our products are the global standard for cutting foamed resin insulation materials for construction.

Claims

1. A handheld electric circular saw for woodworking has a rotating circular saw blade that cuts architectural foam resin insulation material whose surface is coated with an aluminum thin film or plate while suppressing dust. The electric circular saw blade that rotates and cuts metal plates has an outer shape that is a Reuleaux triangle, and the ground cutting edge is a single-edged electric circular saw blade with one side flat and the other side inclined from the vicinity of the cutting edge, with the end of the flat surface being the cutting edge.

2. 2. The electric circular saw blade according to claim 1, wherein the electric circular saw blade has holes or grooves indicating intermediate distances from the center of rotation to the apex of the cutting edge.

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