JP2003094402A - Arcuated saw for cutting circle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arcuated saw for cutting a circle according to a diameter of a circle. SOLUTION: Since curvature (11) of a width of a saw blade is an arcuated shape forming the same bend as that of each circumference of a circle according to the diameter, an object is cut along a line wherein each circle according to the diameter is drawn with the arcuated saw blade (1).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a saw for cutting a circle shape according to the diameter of the circle.

[0002]

2. Description of the Related Art Conventionally, a long saw-shaped triangular saw blade such as a tapering and straight drawing saw, a file-type hole-cutting saw, and a cylindrical saw having a blade cut on one entire circumference There were those that were cut into circles, those that were made through a thin through hole, such as a thread saw blade, to make a round hole in the circumferential direction.

[0003]

Problems to be Solved by the Invention The routing saw, the cutting saw, the hole saw, and the like have the following drawbacks.
I draw a circle and cut along the line, but even if I always pay attention to the line, it warps outside or inside the line, the circle is not accurate, the cut surface cut by the saw is rough, Since I did not put a saw vertically, the cut was often not perpendicular to the surface. A tool that draws a circle on an object and cuts a round hole, but the saw is used to make a cut at an angle, or a saw used to open a circle through an object, and a tool that makes a hole while conscious of the center of the circle There are few holes, and the hole saw requires electric power, and if it is installed improperly, it will rotate quickly, which is dangerous. The present invention was made to eliminate these drawbacks. [0004]

As shown in FIG. 1, an arc saw blade (1) is attached to a handle (2). Saw blade (1)
2 is shown in FIG. 2 and is in the shape of an arcuate saw blade. The arc-shaped saw blade (1) shown in FIG. 1 has a narrow tapered portion (3) and a wide portion (4). The arc-shaped saw blade (1) uses the same material as a conventional flat saw blade. It is made by first bending a flat saw blade or cutting it from a cylindrical saw blade material. The curvature of the arc is the same as the roundness on the circumference depending on the diameter, and the width of the arc may be one eighth or less of the circumference. The method of cutting the teeth of the saw blade of FIG. 1 is the same as that of a conventional saw blade. As an example, the shape shown in FIG. 3 is an arc-shaped saw blade, and the shape and width of the same curved arc as the arc AB (6) on the circle (5) centered on O are as shown in FIG. It is used for an arc-shaped saw blade (1), and the arc bending on the circumference depending on the diameter is a circle (5) centered on O in Fig. 3 and a small circle (7) centered on O '. Then, the curves are slightly different as seen in the arcs AB (6) and CD (8). This difference in bending is applied to an arc-shaped saw blade. When the object (9) is cut at the beginning of the round hole shown in FIG. 5, the third width of the arc-shaped saw blade (1) is reduced to one-third of the total length as the tapered portion (3) of FIG. I made it easy to enter the place where (10) was opened. FIG. 4 is a perspective view showing the arc-shaped saw blade (1) and the bending of the width (11) in an easy-to-understand manner, which is attached to the handle (2) and the tapered portion (3).
And a wide portion (4). The present invention is an arc-shaped saw having the above-mentioned configuration, which cuts a circle.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The practice of the present invention will be described.
With a saw in the shape of an arc, which is a part of a circle, when it is turned up and down so as to hold the center of the circle and directed in the circumferential direction, the component force that is pulled to the center and the component force that goes around the circle are combined to create a vector The arc force saw blade (1) cuts the object in a circular shape while turning in the circumferential direction by the resultant force. When using the present invention, a hole is first drilled through the object (9) shown in FIG. 5, such as a round drill hole (10), as round as the width of the tapered portion (3). While inserting the tapered portion (3) of the present invention into the penetrating hole and raising and lowering the saw blade, while sawing toward the thickness of the object (9), the circumference (1
If the width of the cut in the circumferential direction becomes the same as the width of the wide part (4) while turning in the direction of 2), the circle is drawn along the circumference drawn on the object only by the wide part (4). It is the one that cuts off. The arc-shaped saw blade (1) shown in FIG. 6 is cut along the circumference (12) into circles.

[0006]

This saw is made of the same material as a general saw. It is easy to manufacture by making the saw blade into an arc shape and making a tapered portion. It is shaped and utilizes the movement of the saw blade in the direction of the circumference. It quickly and accurately cuts a circle according to the diameter, and it is easy to cut the cut at right angles to the surface. An arc-shaped saw blade that is an arc shape that is a part of a circle corresponding to each diameter cuts an object and goes up and down, but since the surface of the saw blade has a curved shape, it naturally and physically acts. The saw blade naturally turns in the circumferential direction to penetrate the material and cut a circle. A circle cut by a saw blade having an arc shape having the same width as the arc AB (6) of the circle (5) whose shape is described in FIG. 3 as an example is a circle of the arc AB (6). If the diameter is 5 cm, a 5 cm circular shape can be created by pulling an object with an arc-shaped saw blade dedicated to 5 cm.
It is easy to make holes for plumbing in walls for electrical work and construction work, and it is advisable to prepare an arc-shaped saw blade with a width for each hole, depending on the diameter of each hole. Especially, it is of great value to be used as a tool that makes it easy for children to make holes in wood and other work. The material of the arc-shaped saw blade that cuts the soft material may be made of synthetic resin.

[Brief description of drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG. 1 of the present invention.

FIG. 3 is an illustration of the form of FIG. 2 of the present invention.

FIG. 4 is a perspective view of an embodiment of the present invention.

FIG. 5 is a perspective view of an embodiment of the present invention.

FIG. 6 is a perspective view of an embodiment of the present invention.

[Explanation of symbols]

1 arc-shaped saw blade 2 patterns 3 point details 4 wide part 5 yen 6 arcs AB 7 small circles 8 arc CD 9 objects 10 drill holes 11 width bend 12 circumference

Claims (2)

[Claims] 1. An arc saw that cuts a circle in which the cross-sectional shape of the blade surface of the saw is in the form of an arc of a suitable length that is a portion of the circumference depending on the diameter of the circle. 2. An arc saw that cuts a circle provided with a tapered portion that narrows the width of the saw blade at the end of the entire length of the arc saw blade according to claim 1.