JP4225665B2 - Portable electric cutting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable electric cutting tool.
[0002]
[Prior art]
FIG. 3 shows an enlarged cross-sectional view of a main part of a conventional portable electric cutting tool.
[0003]
In the figure, 1 is a rotating shaft that rotates upon receiving the drive of an electric motor (not shown), 2 is a bearing that rotatably holds the rotating shaft 1, and 3 and 5 are a pair that is attached to the rotating shaft 1 and clamps and fixes the rotating blade 4. When the rotary shaft 1 is rotated by receiving the drive of the electric motor, the rotary blade 4 is rotated integrally with the washers 3 and 5 to cut a workpiece (not shown).
[0004]
[Problems to be solved by the invention]
Conventional portable cutting tool, since the outer diameter of the washer 3 and 5 as shown in FIG. 3 were those that had been formed in the same size, the waterproof sealing member 8 with a sticky 4 When the attached cut material 7 such as a siding material is cut, the waterproof seal material 8 is wound around the washer 3, and the waterproof seal material 8 uses a ball bearing for the clearance between the rotary shaft 1 and the bearing 2 or the bearing 2. May intrude into the ball bearing, hindering the operation of the rotary shaft 1 or the bearing 2 and reducing the life of the portable electric cutting tool.
[0005]
The objective of this invention is providing the portable electric cutting tool which can eliminate the said fault, suppresses that a waterproof seal material penetrate | invades into a bearing side rather than a washer, and can suppress lifetime reduction.
[0006]
[Means for Solving the Problems]
The object is to provide an inclined portion inclined toward the rotary shaft side toward the rotary blade side on the outer peripheral surface of the bearing side washer, and to reduce the radial dimension of the bearing side washer toward the rotary blade side. This is achieved by forming a storage portion between the inclined portion and the rotary blade.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the portable electric cutting tool of the present invention. Since the configuration other than the washer 3 on the bearing 2 side is the same as that of the conventional portable electric cutting tool, the description thereof is omitted.
[0008]
As shown in the drawing, a protrusion 3 a is provided on the outer peripheral surface 3 b of the washer 3 on the bearing 2 side so as to protrude outward in the radial direction of the washer 3. The protrusion 3 a is formed so that the side surface 3 c of the protrusion 3 a on the rotary blade 4 side is separated from the side surface 4 a of the rotary blade 4 by a dimension A, and the outer peripheral surface 3 d of the protrusion 3 a extends from the outer peripheral surface 3 b in the radial direction of the washer 3. It is formed so as to be separated from dimension B. The dimensions A and B are set to be at least larger than the diameter dimension of the waterproof sealing material 8.
[0009]
As described above, by providing the washer 3 with the protrusion 3 a, the storage portion 10 is formed between the side surface 4 a of the rotary blade 4 and the bearing 2 side surface of the washer 3 by the protrusion 3 a and the side surface 4 a of the rotary blade. It will be. By accommodating portion 10 is formed protruding portion 3a as described above, the dimension in the axial direction A, has a structure having a dimension B in the radial direction, the waterproof sealing member 8 as shown in FIG. 3 mounted When the waterproof sealing material 8 is wound around the washer 3 when the cut material 7 is cut, the waterproof sealing material 8 is stored in the storage portion 10 and is prevented from entering the bearing 2 side of the washer 3. It becomes like this.
[0010]
In addition, even if the waterproof seal material 8 is wound around the washer 3 several times by setting the dimension B of the storage portion 10 to be larger, the waterproof seal material 8 is prevented from entering the bearing 2 side than the washer 3. can do.
[0011]
In FIG. 1, the inclined portion 3 f is provided on the outer peripheral surface 3 b of the washer 3 so that the storage portion 10 is formed by the inclined portion 3 f and the side surface 4 a of the rotary blade 4.
[0012]
FIG. 2 shows another embodiment of the portable electric cutting tool of the present invention.
[0013]
2, the washer 3 having the inclined portion 3 f shown in FIG. 1 is attached with a protruding member 6 that protrudes radially outward from the outer peripheral surface 3 b of the washer 3. The storage portion 10 is formed by 4a.
[0014]
The embodiment shown in FIGS. 1 and 2 is one in which the axial dimension A of the storage portion 10 is formed larger than the diameter dimension of the waterproof seal material 8, and when the waterproof seal material 8 is wound around the washer 3. The waterproof seal material 8 is prevented from entering the bearing 2 side of the washer 3 by accommodating the waterproof seal material 8 in the storage portion 10. In the embodiment shown in FIG. 1, the radial dimension B of the washer 3 of the storage unit 10 is formed to be smaller than the diameter dimension of the waterproof seal material 8, but even in this configuration, the washer 3 is waterproof. When the sealing material 8 is wound, the waterproof sealing material 8 can be prevented from entering the bearing 2 side.
[0015]
【The invention's effect】
As described above, according to the present invention, the outer peripheral surface of the bearing side washer is provided with the inclined portion inclined toward the rotary shaft side toward the rotary blade side, and the radial dimension of the bearing side washer is set on the rotary blade side. By making it smaller as it goes, it is possible to prevent the waterproof sealing material from entering the bearing side from the washer by forming a storage part between the inclined part and the rotary blade, and to reduce the service life. A portable electric cutting tool that can be suppressed can be provided.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view showing a main part of an embodiment of the portable electric cutting tool of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part showing another embodiment of the portable electric cutting tool of the present invention.
FIG. 3 is an enlarged cross-sectional view of a main part showing an example of a conventional portable electric cutting tool.
FIG. 4 is a perspective view showing an example of a material to be cut.
[Explanation of symbols]
1 is a rotary shaft, 2 is a bearing, 3 and 5 are washers, 3a is a protrusion, 3b is an outer peripheral surface, 4 is a rotary blade, and 4a is a side surface of the rotary blade.

Claims (2)

A portable electric motor comprising: an electric motor; a rotating shaft that rotates by receiving the rotation of the electric motor; a bearing that rotatably supports the rotating shaft; and a pair of washers that are attached to the rotating shaft and sandwich and fix the rotating blade. In the cutting tool,
An inclined portion inclined toward the rotary shaft side is provided on the outer peripheral surface of the bearing side washer toward the rotary blade side, and the radial dimension of the bearing side washer is reduced toward the rotary blade side so that the inclination is reduced. A portable electric cutting tool characterized in that a storage part is formed between a rotary part and the rotary blade.   The portable electric cutting tool according to claim 1, wherein a protruding member that protrudes radially outward from an outer diameter of the washer is attached to the bearing-side washer.

Images