Blade

Abstract

To solve the problem in a blade of a vibration multi tool which is provided with cutting teeth at the tip, the use of the blade enabling cutting of an object only by pressing a vibrating tip part against the object, in which when the vibrating tip part is brought into contact with the object, the cutting teeth bounce on a surface of wood or the like to scratch a surface of the object or cut a wrong part.SOLUTION: A blade for an electric tool having a drive shaft that performs reciprocating circular arc vibrations comprises: a tooth row formed linearly by a plurality of cutting teeth at a front end; and a connecting hole for connecting to the center of the drive shaft at a rear end. A first cutting tooth at a tip among the plurality of cutting teeth is formed with a tooth tip lower than that of an adjacent second cutting tooth, the second cutting tooth is formed with a tooth tip lower than that of an adjacent third cutting tooth, and the third cutting tooth is formed with a tooth tip lower than that of an adjacent fourth cutting tooth.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a blade for a power tool called an oscillating multi-tool. [Background technology]

[0002] An oscillating multi-tool is an electric tool that can perform cutting, peeling, grinding, etc. by replacing the blade. Since an oscillating multi-tool cuts an object by reciprocating the blade with a very small amplitude, it is safer than an electric circular saw, etc.

[0003] Some oscillating multi-tool blades have cutting teeth at the tip, and when using such blades, it is possible to cut an object by simply pressing the vibrating tip against the object. The width of the tip of a blade with cutting teeth at the tip is about 30 mm to 70 mm, and since it is possible to cut an object by simply pressing the vibrating tip against the object, it is suitable for cutting small parts.

[0004] When using a blade with cutting teeth at the tip to cut wood or other materials, the vibrating tip is brought into contact with the object, but at that time, the cutting teeth may dance on the surface of the object (wood, etc.), causing problems such as scratches on the surface of the object or cutting the wrong part.

[0005] For this reason, a vibration multi-tool blade is known in which the cutting teeth in the center of the tooth row are made higher than the other cutting teeth and cut first, thereby preventing the cutting teeth from dancing on the surface of the object. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2019-177515 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when using the blade of Patent Document 1, the cutting teeth in the center of the tooth row must be advanced in order to prevent the cutting teeth from dancing on the surface of the target object. Therefore, when the edge part of the blade's tooth row is used for more detailed work, the effect of preventing the cutting teeth from dancing on the surface of the target object cannot be achieved.

[0008] The present invention has been made in consideration of the problems with such conventional inventions, and provides an oscillating multi-tool blade that prevents the cutting teeth from dancing on the surface of wood, etc., even when the end portion of the blade is used for more detailed work. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention has at least the following configuration or executes the following procedures.

[0010] The blade of the present invention is a blade for an electric tool having a drive shaft that vibrates in a reciprocating circular arc, and is equipped with a row of teeth formed in a linear manner by a plurality of cutting teeth at the front end, and a connecting hole at the rear for connecting to the center of the drive shaft, and is characterized in that of the plurality of cutting teeth, the endmost first cutting tooth is formed so that its tip is lower than the adjacent second cutting tooth, the second cutting tooth is formed so that its tip is lower than the adjacent third cutting tooth, and the third cutting tooth is formed so that its tip is lower than the adjacent fourth cutting tooth. This configuration makes it possible to prevent the cutting teeth from dancing on the surface of wood or the like, even when using the edge portion of the blade to perform finer work.

[0011] Also, preferably, the first incisor teeth are formed with a tip 0.1 mm to 0.25 mm lower than the second incisor teeth, the second incisor teeth are formed with a tip 0.1 mm to 0.25 mm lower than the third incisor teeth, and the third incisor teeth are formed with a tip 0.1 mm to 0.25 mm lower than the fourth incisor teeth, and the width in which the tooth row is formed is in the range of 30 mm to 70 mm. With this configuration, the cutting teeth on the blade can be more reliably prevented from dancing on the surface of wood or the like. Effect of the Invention

[0012] As described above, by using the blade of the present invention, even when the edge of the blade is used to perform finer work, the cutting teeth of the blade can be prevented from dancing on the surface of wood, etc. This makes it possible to prevent scratches on the surface of the target object, such as wood, and to prevent cutting the wrong places. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a power tool 10 having a drive shaft 110 that oscillates in a reciprocating circular arc and to which a blade 100 according to a first embodiment of the present invention is attached. [Diagram 2] 1 is a diagram showing a blade 100 according to a first embodiment of the present invention. [Diagram 3] 1A and 1B are diagrams showing a case where a blade 100 according to a first embodiment of the present invention is brought into contact with an object, and a case where a conventional blade is brought into contact with an object. [Figure 4] FIG. 2 is a diagram showing a blade 200 according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, each embodiment of the present invention will be specifically described with reference to the drawings. Note that the embodiment described below is merely a specific example for carrying out the present invention, and is not intended to limit the present invention.

[0015] FIG. 1 is a diagram showing a power tool 10 having a drive shaft 110 that oscillates in a reciprocating arc and to which a blade 100 according to a first embodiment of the present invention is attached. The drive shaft 110 of the power tool 10 having a drive shaft that oscillates in a reciprocating arc has a very small vibration angle. Specifically, it oscillates in a reciprocating arc of 4.0 degrees or less. As a result, the blade 100 according to the first embodiment of the present invention also oscillates in a reciprocating arc, but since the angle is very small, it performs a pseudo linear reciprocating motion. Therefore, the blade 100 according to the first embodiment of the present invention has a structure that allows cutting of an object by simply pressing the cutting teeth 130 provided at the tip of the blade 100 against the object such as wood. The power tool 10 having the drive shaft 110 that oscillates in a reciprocating arc is a so-called vibration multi-tool.

[0016] 2 is a diagram showing a blade 100 according to a first embodiment of the present invention. The blade 100 has a tooth row formed linearly by a plurality of cutting teeth 130 at its front end, and a connecting hole 120 for connecting to a drive shaft 110 of an electric tool at its rear. The width across which the tooth row is formed is 33.4 mm. The length from the center of the connecting hole 120 to the cutting tooth provided at the center is 77.5 mm.

[0017] The tooth row is formed linearly by a plurality of cutting teeth 130. It should be noted that not all of the cutting teeth 130 are arranged in a straight line, but the heights of the three cutting teeth at the end are slightly different. Specifically, among the plurality of cutting teeth 130, the first cutting tooth 131 at the end is formed with a tooth tip 0.2 mm lower than the adjacent second cutting tooth 132, the second cutting tooth 132 is formed with a tooth tip 0.2 mm lower than the adjacent third cutting tooth 133, and the third cutting tooth is formed with a tooth tip 0.2 mm lower than the adjacent fourth cutting tooth 134. By providing steps on the cutting teeth at the end in this way, it is possible to reduce shaking at the start of cutting. As a result of various experiments, a blade with a step of 0.2 mm each on the three cutting teeth at the end was particularly effective in reducing shaking, but this is not limited to this, and steps may be provided on three or more cutting teeth at the end. The step may be in the range of 0.1mm to 0.25mm, and a step with a difference of 0.2mm was particularly effective in reducing vibration. The pitch of the cutting teeth 130 of the blade 100 according to the first embodiment of the present invention is 1.6mm, and when the pitch is 1.6mm, the step is preferably 0.2mm, and when the pitch is 1.2mm, the step is preferably 0.1mm. In other words, it was confirmed that it is more effective to reduce the step by reducing the pitch. The width of the tooth row is preferably in the range of 30mm to 70mm.

[0018] All the incisors other than the first incisor tooth 131, the second incisor tooth 132, and the third incisor tooth 133 are the same height, the positions of the tips of the incisors are all aligned, and the tooth row is formed in a straight line. In other words, the incisors other than the first incisor tooth 131, the second incisor tooth 132, and the third incisor tooth 133 are formed in the same manner as the fourth incisor tooth 134.

[0019] The blade 100 according to the first embodiment of the present invention is provided with a so-called set. However, depending on the application, the thickness of the cutting teeth may be constant and no set may be provided.

[0020] 3 is a diagram showing a case where the blade 100 according to the first embodiment of the present invention is brought into contact with an object and a case where a conventional blade is brought into contact with an object. By providing steps in the first cutting tooth 131, the second cutting tooth 132, and the third cutting tooth 133, when the end portion of the blade 100 is used, each cutting tooth comes into contact parallel to each other, thereby preventing the cutting teeth from dancing on the surface of wood or the like.

[0021] Next, a blade 200 according to a second embodiment of the present invention will be described. Fig. 4 is a diagram showing the blade 200 according to the second embodiment of the present invention. Note that the same reference symbols are used in Fig. 4, and detailed description will be omitted. In this embodiment, the configuration different from the blade 100 according to the first embodiment of the present invention will be mainly described.

[0022] The blade 200 according to the second embodiment of the present invention, like the blade 100 according to the first embodiment, has a tooth row formed linearly by a plurality of cutting teeth 130 at the front end of the blade, and a connecting hole 120 for connecting to the center of the drive shaft 110 of the power tool at the rear. The length of the width where the tooth row is formed is 64 mm. The length from the center of the connecting hole to the cutting tooth provided at the center is 73.5 mm.

[0023] As described above, by using the blade according to the first embodiment of the present invention and the blade according to the second embodiment, it is possible to prevent the cutting teeth from dancing on the surface of wood, etc., even when using the end portion of the blade to perform more detailed work. [Industrial Applicability]

[0024] The blade according to the first embodiment of the present invention and the blade according to the second embodiment are oscillating multi-tool blades and are effective for performing more detailed work, and therefore are particularly effective when finishing the contents. [Explanation of symbols]

[0025] 10 Power tools 100 Blades 110 Drive shaft 120 Connection hole 130 Incisor 131 First incisor 132 Second incisor 133 Third incisor 134 Fourth incisor 200 Blades

Claims

1. A blade for a power tool having a drive shaft that vibrates in a reciprocating arc, At the front end is a row of teeth formed in a straight line by multiple incisors. a connecting hole at the rear for connecting to the center of the drive shaft; Among the plurality of cutting teeth, a first cutting tooth at an end is formed so that a tooth tip thereof is lower than a second cutting tooth adjacent thereto, The second cutting tooth is formed so that a tip thereof is lower than a tip of an adjacent third cutting tooth, A blade characterized in that the third cutting tooth is formed with a tip lower than the adjacent fourth cutting tooth.

2. The tip of the first cutting tooth is formed 0.1 mm to 0.25 mm lower than the tip of the second cutting tooth, The tip of the second cutting tooth is formed 0.1 mm to 0.25 mm lower than the tip of the third cutting tooth, The tip of the third cutting tooth is formed 0.1 mm to 0.25 mm lower than the tip of the fourth cutting tooth, 2. The blade according to claim 1, wherein the length of the width in which the tooth row is formed is in the range of 30 mm to 70 mm.

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