JPH06335904A - Dust collecting mechanism in motor-driven circular saw - Google Patents

Abstract

PURPOSE:To provide a dust collecting mechanism capable of effectively preventing scattering of dust produced at the time of cutting a gypsum board which has not been treated by a conventional dust collector in a motor-driven circular saw fitted with the dust collecting mechanism. CONSTITUTION:A pipe 3 stretched from the mouthpiece of a dust collecting bag 4 is inserted into the inside of a protective cover 2 from the front insertion hole 2a thereof. The upside of a circular saw edge 1 is covered with the protective cover 2. The tip part 3a of the pipe is made near to the front end part of the circular saw edge 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting mechanism that effectively collects chips from an electric circular saw.

[0002]

2. Description of the Related Art FIG. 4 is a side view of a conventional electric circular saw provided with a dust collecting mechanism. Conventionally, as shown in FIG. 4, a dust collecting bag 4 is arranged at the rear of the circular saw blade 1, a pipe 3 is extended from the bag mouth of the dust collecting bag 4, and a protective cover 2 for protecting the upper side of the circular saw blade is provided. An electric circular saw equipped with a dust collecting mechanism in which a suction port 2b is provided at an upper portion and the tip of the pipe 3 is fixed to the suction port 2b is well known. This is because, as the circular saw blade 1 rotates in the R direction in the drawing, the air flow caused by the air flow causes the chips generated at the front end 1a, which is the cutting portion of the circular saw blade 1, to move as shown by the arrow K. As the circular saw blade 1 rotates, it is sucked into the inside of the protective cover 2, and further, a dust collecting bag 4 is passed through a pipe 3 from an inlet 2a in the upper portion of the protective cover 2.
It has a dust collection structure that is stored inside.

[0003]

The electric circular saw is used for cutting wood, gypsum board, etc. However, since the cutting chips, namely sawdust, generated during the cutting of wood are relatively large, Even the dust collecting mechanism according to the conventional technique can sufficiently collect dust. However, when cutting plasterboard with an electric circular saw,
Since very fine dust is generated and the distance from the front end 1a of the circular saw blade 1 to the suction port 2b is long, only the air due to the rotational force of the circular saw blade 1 will make the light and fine dust cover the protective cover 2
The protective cover 2 cannot be completely introduced into the suction port 2a.
A lot of dust is also scattered from the side of, and the dust cannot be collected in the dust bag 4. Therefore, depending on the material of the cut object such as gypsum material, a large amount of dust is scattered during the cutting operation,
It is a hindrance to the work.

[0004]

The present invention uses the following means in order to solve the above problems. That is, in an electric circular saw, a pipe extending from the dust collecting bag mouth is fitted from the front part of the protective cover part that covers the upper side of the circular saw blade, and the pipe tip is brought close to the front end part of the circular saw blade. Let them do it.

[0005]

[Function] When cutting a gypsum board or the like using an electric circular saw, cutting chips and dust generated at the cutting portion of the tip of the circular saw blade come close to the front end according to the rotating flow of the circular saw blade. Most of the chips are introduced into the pipe from the tip of the pipe and are not scattered, and most of the chips are stored in the dust bag.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of an electric circular saw adopting the dust collecting mechanism of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is a partial rear view showing the shape of the pipe tip.

In the electric circular saw, as shown in FIGS. 1 and 2, a motor M is laterally arranged on the side of the main body, and a circular saw blade 1 is fixed to the tip of the drive shaft of the motor M. The circular saw blade 1 is driven to rotate in the R direction by driving, the cutting member is positioned at the front end 1a, and the electric circular saw is moved forward to perform cutting. Grips the handle portion 6 arranged on the upper part of the main body, and abuts the front end 1a of the circular saw blade 1 on the body to be cut to cut it. The circular saw blade 1
The upper half side of the circular saw blade 1 is covered with a protective cover 2 as shown in FIGS. 1 and 2 to ensure worker's safety, and the blade portion below the circular saw blade 1 is covered with a guide 5. .

Further, a pipe 3 is arranged along the upper surface of the protective cover 2, a dust bag 4 is connected to the rear end of the pipe 3, and the front end of the pipe 3 is fitted into the front end of the protective cover 2. Fits inside the hole 2a, and the pipe tip 3a
Is close to the front end 1a of the circular saw blade 1.

That is, the front end 1a of the circular saw blade 1 is a cutting portion and is a portion where chips are generated. The powder is introduced into the tip portion 3a before being scattered, and most of the powder is introduced into the pipe 3. Further, the surface of the pipe tip portion 3a close to the circular saw blade 1 is cut as shown in FIG. 3 so that more chips can be easily introduced.

Although cutting chips are naturally introduced into the pipe 3 by the flow of air due to the rotating force of the circular saw blade 1, in order to more reliably suck the cutting chips, the dust collecting bag 4 is provided. It is also possible to connect a suction device so as to more strongly suck in the dust collecting device, and to use the rotational force of the motor M to drive the suction fan to suck into the dust collecting bag 4. It is also possible to do so.

[0011]

The present invention having the above-described structure has the following effects. That is, by bringing the tip of the pipe extending from the bag mouth of the dust collecting bag close to the front end of the circular saw blade of the electric circular saw, the chips generated at the front end of the circular saw blade, Even very fine dust such as cutting chips of gypsum material is immediately introduced into the pipe, and most of it is stored in the dust bag. That is, since the distance from the front end of the circular saw blade, which is the generation point of cutting chips, to the suction port of the pipe is short, scattering of cutting chips that often occurs hardly occurs, even when cutting plaster material, etc. A comfortable cutting work can be obtained.

[Brief description of drawings]

FIG. 1 is a side view of an electric circular saw adopting a dust collecting mechanism of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a partial rear view showing the shape of the pipe tip.

FIG. 4 is a side view of an electric circular saw provided with a conventional dust collecting mechanism.

[Explanation of symbols] 1 circular saw blade 2 protective cover 2a pipe fitting hole 3 pipe 3a pipe tip 4 dust bag

Claims (1)

[Claims] 1. In an electric circular saw with a dust collecting mechanism, a pipe extending from a dust collecting bag mouth is fitted from a front portion of a protective cover portion covering an upper side of a circular saw blade, and a tip of the pipe is rounded. A dust collecting mechanism for an electric circular saw, which is located close to the front end of the saw blade.