JP2001259924A - Portable dust collecting and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable dust collecting and cutting tool capable of suppressing whistling noises generated in using a dust collector. SOLUTION: An inclining part 2a is provided to a saw cover 2 so as to vary a gap between saw blade 1 and an inner wall of the saw cover 2 at back of a root part space 3a of a chip discharging opening 3 in a rotating direction of the saw blade 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable dust collecting and cutting tool provided with a saw cover having a chip discharge port.

[0002]

2. Description of the Related Art FIGS. 6 to 8 show an example of a conventional portable dust collecting and cutting tool. 6 is a partially omitted front view showing an example of a conventional portable dust collecting and cutting tool, FIG. 7 is a sectional view of a main part of FIG. 6, and FIG.
FIG. 7 is a sectional view taken along line CC of FIG. 6. Hereinafter, the portable dust collecting and cutting tool will be described as a portable dust collecting circular saw.

[0003] A portable dust collecting circular saw shown in the figure has a shape in which almost the upper half of a saw blade 1 is covered by a saw cover 2, and cutting chips generated in the saw cover 2 at the time of cutting communicate with the inside of the saw cover 2. It was configured to discharge to the outside from the powder discharge port 3.

A dust collecting bag (not shown) for storing chips and a hose of a dust collector are attached to the chip discharging port 3 shown in FIG. As a result, chips generated in the saw cover 2 during cutting can be collected from the chip discharge port 3.

As shown in FIG. 8, in the portable dust collecting circular saw, a gap between the saw blade 1 and the inner wall of the saw cover 2 is formed below a root space 3a for communicating the inside of the saw cover 2 with the chip discharge port 3. By reducing the size, the chips are easily guided to the chip discharge port 3 by the rotation of the saw blade 1.

[0006]

In the portable dust collecting circular saw described above, the gap between the saw blade 1 and the inner wall of the saw cover 2 in the lower part of the root space 3a of the chip discharge port 3 is reduced, so that the chips are reduced. Although it was configured to be easily guided to the chip discharge port 3, as shown in FIG. 7, the guide is guided to the chip discharge port 3 in the rotation direction of the saw blade 1 behind the chip discharge port base space 3a. A step 2b is provided in the saw cover 2 for the purpose of reducing the speed of the swarf that has not been cut, and a gap is formed between the saw blade 1 and the inner wall of the saw cover 2 from the gap between the saw blade 1 and the inner wall of the saw cover 2 below the root space 3a. Was also configured to be large. With such a configuration, when a hose of a dust collector (not shown) is connected to the chip discharge port 3 and dust is collected in the saw cover 2 by the dust collector, the suction force of the dust collector is used as shown in FIG. 8, the air in the saw cover 2 flows as indicated by a chain line arrow, and when the air flows through the step 2b of the saw cover 2 and into the chip discharge port 3, the step 2b becomes a resistance to the flow of air. However, there is a drawback that a whistling sound may be generated.

An object of the present invention is to provide a portable dust collecting circular saw which can solve the above-mentioned drawbacks and suppress the occurrence of whistling noise when using a dust collector.

[0008]

The above object is achieved by providing the saw cover with an inclined portion for changing the gap between the saw blade and the inner wall of the saw cover in the rotation direction of the saw blade behind the space at the base of the chip discharge port. Achieved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the portable dust collecting circular saw of the present invention will be described with reference to FIGS. 1 is a partially omitted front view showing an embodiment of the portable dust collecting circular saw of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG.
4 is a view as seen in the direction of arrow A in FIG. 1, and FIG. 5 is a view as seen in the direction of arrow D in FIG.

As shown in FIG. 3, the gap between the saw blade 1 and the inner wall of the saw cover 2 is made small below the root space 3a of the chip discharge port 3, so that the flow of air generated by the rotation of the saw blade 1 is increased. This makes it easy for the chips to be guided to the chip discharge port 3. The portable dust collecting circular saw shown in the figure is configured such that the gap between the saw blade 1 and the inner wall of the saw cover 2 is reduced over the entire surface in front of the chip discharge port 3 in the rotation direction of the saw blade 1. The flow of air generated by the rotation of the blade 1 is strengthened so that chips are easily guided to the chip discharge port 3.

On the other hand, in order to reduce the speed of the chips not guided to the chip discharge port 3 behind the root space 3a of the chip discharge port 3 in the rotation direction of the saw blade 1, FIG. As shown in FIGS. 3 and 5, the gap between the saw blade 1 and the inner wall of the saw cover 2 is larger than the gap between the saw blade 1 and the inner wall of the saw cover 2 below the root space 3a.

As shown in FIG. 3, the space between the saw blade 1 and the inner wall of the saw cover 2 below the root space 3a of the chip discharge port 3 is small, and the saw is located behind the root space 3a in the rotational direction of the saw blade 1. An inclined portion 2a provided on the saw cover 2 is located between the blade 1 and the place where the gap between the saw cover 2 and the inner wall of the saw cover 2 is large, and the size of the gap between the saw blade 1 and the inner wall of the saw cover 2 is reduced by the inclined portion 2a. It changes gradually.

With the above-described configuration,
When a dust collector hose is connected to the chip discharge port 3 and dust is collected in the saw cover 2 by the dust collector, air is generated by the suction force of the dust collector so that the gap between the saw blade 1 and the inner wall of the saw cover 2 is large. It is possible to suppress the generation of a whistling sound when passing from the location to the chip discharge port 3 through a location with a small gap.

[0014]

According to the present invention, the saw cover is provided with an inclined portion for changing the gap between the saw blade and the inner wall of the saw cover in the rotation direction of the saw blade behind the root space of the chip discharge port. Since the size of the gap with the inner wall of the saw cover is gradually changed, it is possible to provide a portable dust collecting circular saw that suppresses generation of a whistling sound when a dust collector is used.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view showing an embodiment of a portable dust collecting circular saw of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a view in the direction of arrow A in FIG. 1;

FIG. 5 is a view in the direction of arrow D in FIG. 1;

FIG. 6 is a partially omitted front view showing an example of a conventional portable dust collecting circular saw.

FIG. 7 is a sectional view of a main part of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 7;

[Explanation of symbols]

1 is a saw blade, 2 is a saw cover, 2a is an inclined portion, 3 is a chip discharge port, and 3a is a base space of the chip discharge port.

Claims (1)

[Claims] 1. A housing having a built-in motor for driving, a saw blade driven by the motor to cut a work material, a saw cover having a shape that covers a part of the saw blade and having a substantially concentric shape, and a saw cover. A saw blade and a saw cover inner wall at a lower part of a root space of the chip discharge port that communicates with the inside and discharges chips generated at the time of cutting to the outside and at least communicates the inside of the saw cover with the chip discharge port. Portable dust collector with a small gap between the saw blade and the inner wall of the saw cover in the rotation direction of the saw blade behind the base space of the chip discharge port and larger than the lower part of the base space of the chip discharge port In the cutting tool, the saw cover is provided with an inclined portion that changes a gap between the saw blade and the inner wall of the saw cover in a rotation direction of the saw blade rearward of a root space of the chip discharge port. Portable dust collection cutting tool.