hole saw

Abstract

To provide a hole saw that can easily push out a cut piece. [Solution] A hole saw 1 having a circular body 6, a cutting portion 7 having multiple cutting edges 8 formed at the tip of the body, a slit portion 9 that is wider than the width of the cutting edges and formed from the cutting edge to the body, and a drill portion 11 located in the center of the body, wherein the slit portion formed in the body of the hole saw is formed straight along the longitudinal direction of the body from the cutting edge to the body, and the width of the slit portion is wider than the width of one of the cutting edges.

Description

[Technical Field]

[0001] The present invention relates to a hole saw that can be attached to and detached from an electric drill. [Background technology]

[0002] Conventionally, one example of a hole saw that can be attached to and detached from an electric drill is the invention described in Patent Document 1 below (hereinafter, the invention described in Patent Document 1 will be referred to as the "Publication 1 Invention"). The Publicly Known Document 1 invention has a cylindrical body with a cutting edge formed at the tip and a long, thin hole formed on the side of the body. When a hole is drilled in a cutting object, a piece of the cutting object that is cut to the same shape as the inner diameter of the body remains inside the body, but a tool such as a screwdriver can be inserted into the hole, pushing the piece out and removing it from the body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-176673 Summary of the Invention [Problem to be solved by the invention]

[0004] The object to be cut with a hole saw is a steel plate, which is generally thin, so it is possible to push out the pieces. However, if the object to be cut is a thick piece of wood, for example, the pieces are also thick, making it difficult to push out the pieces. Also, if the object to be cut is a molded product made of resin such as polyvinyl chloride, the frictional heat generated by the rotation of the hole saw will cause the resin to burn, making it difficult to remove the pieces.

[0005] The present invention has been proposed in view of the above circumstances, and aims to provide a hole saw that makes it easy to push out the cut piece. [Means for solving the problem]

[0006] In order to achieve the above object, the hole saw of the present invention is characterized by having a circular body portion, a cutting portion having a plurality of cutting edges formed at the tip of the body portion, a slit portion that is wider than the width of the cutting edges and that extends from the cutting edge to the body portion, and a drill portion that is located at the center of the body portion.

[0007] The hole saw according to the present invention is characterized in that the slit portion is straight along the longitudinal direction of the body portion.

[0008] The hole saw according to the present invention is characterized by having a plurality of the slit portions.

[0009] The hole saw of the present invention is characterized in that it has longitudinal holes formed in the body along the longitudinal direction of the body, the holes being configured in pairs facing each other with the drill section at the center, the slits being configured in pairs facing each other with the drill section at the center, and the slits and the holes being arranged at equal intervals along the circumferential direction of the body.

[0010] The hole saw of the present invention is characterized by being bimetallic. [Effects of the Invention]

[0011] The hole saw according to the present invention includes a circular body, a cutting section with multiple cutting edges formed at the tip of the body, a slit that is wider than the cutting edges and extends from the cutting section to the body, and a drill located at the center of the body. Since the slit extends from the cutting section to the body, the cutting section is cut away and opened at the location where the slit is formed. An operator can insert a tool into the slit and move it along the slit to pass through the open area. Furthermore, the wide slit allows the operator to easily move the tool, thereby easily pushing out the cutting piece.

[0012] In the hole saw according to the present invention, the slit is straight along the longitudinal direction of the body, allowing the operator to move the tool straight along the slit, making it easier to push out the cut piece.

[0013] The hole saw of the present invention has multiple slits, allowing the operator to insert the tool into the slits from various directions to deal with the clogging of the cuttings, making it easier to push out the cuttings.

[0014] The hole saw according to the present invention has a pair of longitudinal holes formed in the barrel along the longitudinal direction of the barrel, with the holes facing each other around the drill portion, and a pair of slits facing each other around the drill portion, with each slit and hole being equally spaced along the circumference of the barrel. This allows the operator to insert a tool into the slit or hole from various directions to address the degree of chip clogging. This makes it easy to push out the chips. Furthermore, frictional heat generated by the rotation of the hole saw is dissipated through the slits and holes, thereby preventing deterioration due to frictional heat.

[0015] The hole saw of this invention is a bimetal. Bimetal hole saws, which are made of a combination of two types of metal, are flexible and durable, making them suitable for cutting metal, wood, resin, etc. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a side view of a hole saw according to an embodiment of the present invention. [Figure 2] FIG. 2 is a side half cross-sectional view of a main part of a hole saw according to an embodiment of the present invention. [Figure 3] 3 is a side cross-sectional view of the main part of the hole saw according to the embodiment of the present invention taken along the line III-III in FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] A hole saw according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 shows a side view of a hole saw 1 according to this embodiment. Figs. 2 and 3 show partial cross sections of the hole saw 1. In the following, the direction in which the cutting edge is located will be referred to as the tip, and the direction opposite to the tip will be referred to as the back (see Fig. 1).

[0018] 1 to 3, the hole saw 1 is comprised of a shank portion 2 and a blade body portion 3. The blade body portion 3 is a bimetal made of a combination of two types of metal and is generally cylindrical in shape. The blade body portion 3 has a disk-shaped base portion 4, a ring-shaped body portion 6 extending from the circumferential edge of the base portion 4 toward the tip, a cutting portion 7 formed at the tip of the body portion 6, multiple cutting edges 8 formed on the cutting portion 7, a drill portion 11 located at the center of the body portion 6, and slit portions 9 and holes 10 formed by cutting out the side of the blade body portion 3.

[0019] The base portion 4 has a mounting hole 5 formed in its center, and a tip protrusion (not shown) of the shank portion 2 is inserted into this mounting hole 5. A drill portion 11 is attached to the tip protrusion. The drill portion 11 extends further toward the tip than the cutting portion 7. A coil spring 12 is arranged around the drill portion 11. In other words, the drill portion 11 is inserted at the center of the coil spring 12. The body portion 6 is cylindrical, and the cutting portion 7 is connected to the end of the body portion 6 that extends toward the tip.

[0020] The slit portion 9 is formed straight along the longitudinal direction of the body portion 6, from the cutting portion 7 to the body portion 6, and is open at the tip. The width of the slit portion 9 is wider than the width of one cutting edge portion 8. The slit portion 9 is composed of a pair of slit portions 9 facing each other with the drill portion 11 at the center.

[0021] The hole portion 10 is an elongated or elliptical hole formed in the body portion 6, and does not reach the cutting edge portion 7. The hole portion 10 is oriented straight along the longitudinal direction of the body portion 6. The hole portion 10 is configured as a pair facing each other with the drill portion 11 at the center.

[0022] The pair of slits 9 and the pair of holes 10 are arranged at equal intervals along the circumferential direction of the body 6. Therefore, the slits 9 and the holes 10 are arranged alternately every 45 degrees around the circumference of the body 6.

[0023] Next, the operation and effect of the hole saw 1 will be described.

[0024] The bimetal hole saw 1 is flexible and durable, making it suitable for cutting objects (not shown), such as metal, wood, and resin. When the hole saw 1 is attached to an electric drill (not shown) and rotates, the hole saw 1 is pressed against the object to form a hole. First, the drill portion 11 is pressed against the object to form a small hole, and then the cutting edge 7 cuts off the periphery of the small hole to form a circular hole. At this time, a disc-shaped piece corresponding to the shape of the hole is cut out as cutting waste. When the drill portion 11 is passed through the small hole, the elastic force of the coil spring 12 pushes the piece toward the tip, separating it from the cutting edge 7. This prevents the piece from becoming pinched inside the body 6.

[0025] Even if a piece of material gets caught inside the body 6, the operator can insert a tool such as a screwdriver into the slit 9, move the tool straight along the slit 9 toward the tip, and pass through the open area, thereby pushing out the piece of material. In particular, because the slit 9 is straight along the tip and wide, the operator can easily move the tool and even insert a thick tool. This makes it easy to push out the piece of material.

[0026] Since the slits 9 are formed in two places, the worker can insert a tool into the slits 9 from various directions to deal with the clogging of the pieces depending on the degree of clogging. The worker can also insert a tool into the hole 10 to push out the pieces.

[0027] Frictional heat generated by the rotation of the hole saw 1 is dissipated through the slits 9 and the holes 10. This makes it possible to prevent deterioration due to frictional heat.

[0028] In another embodiment of the present invention, the slit extends obliquely along the longitudinal direction of the body. In other alternative embodiments, the number of slits is arbitrary, so the embodiment may have a single slit or more than two slits. In other alternative embodiments, the number of holes is arbitrary, so the embodiment may have a single hole or more than two holes. In other embodiments, the slits and holes may be arranged in any manner. Another alternative embodiment does not have any holes. Other alternative embodiments are not limited to bimetallic materials.

[0029] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design modifications can be made to the present invention without departing from the scope of the utility model claims. [Explanation of symbols]

[0030] 1 hole saw 2 Shank 3 Blade body 4 Base 5 Mounting holes 6. Torso 7 Blade part 8 Cutting edge 9 Slit section 10 hole 11 Drill Section 12 Coil spring

Claims

1. An annular root portion; A plurality of blade portions extending from the base portion toward the tip end; a groove formed in the root portion between the blade portions adjacent in the circumferential direction, The blade portion is composed of a long blade and a short blade that have different lengths from the base portion, a tip end of the long blade that is the longest from the groove is positioned higher than a tip end of the short blade that is the longest from the groove; A hole saw characterized by:

2. The depth of the groove from the long blade is greater than the depth of the groove from the short blade.

2. The hole saw of claim 1.

3. A tapered protruding blade portion is provided at the center of the base portion and extends further toward the tip than the blade portion.

3. A hole saw according to claim 1 or 2.

Images