Patent Application
20110079125
1. Field of the Invention
The present invention relates to a circular saw, and more particularly to a circular saw device which has sufficient cleaning efficiency and is safe and convenient in use.
2. Description of Related Art
Conventional circular saws are used to cut woods or other constructing materials and thus generate swarf and dust inevitably during operation. Therefore, a market-available conventional circular saw is equipped with a dust-collecting structure to collect the swarf and dust. As shown in
The swarf and dust generated during operation are blown to fly along with the airflow shown as Arrow A occurred by rotation of saw plate 16.
However, the above-mention dust-collecting structure cannot efficiently collect the swarf and dust with quiet little specific gravity. Moreover, the swarf and dust flows along with the airflow are usually emitted out of the dust-collecting hood 14 via an opening for the saw plate 16 extending out of the hood 14. Thus, the dust-collecting efficiency is corresponding deteriorated. The swarf and dust not only pollute the working environment but also likely damage the trachea of workers if the workers inevitably inhale swarf and dust during operation.
A main objective of the present invention is to provide a circular saw that has excellent dust-collecting efficiency and is safe and convenient in use.
To achieve the foregoing objective, the circular saw comprises:
a working platform;
a saw base with a saw plate pivotally mounted on the working platform;
a saw cover pivotally attached to the saw base to perform a dust-collecting hood with a bottom opening to accommodate the saw plate, wherein the saw plate partially emerges out of the bottom opening and is driven by a motor;
a first air-hole defined on a top of the dust-collecting hood over the bottom opening;
a second air-hole defined on a sidewall of the dust-collecting hood facing the saw plate;
one enclosed sheet formed on the saw base and another enclosed sheets formed on the saw cover correspondingly to narrow the bottom opening to only allow passing the saw plate.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
A circular saw in accordance with the present invention is substantially composed of a working platform, a saw base with saw plate, and a saw cover, wherein the saw base and the saw cover are combined together to perform a dust-collecting hood with a bottom opening to accommodate the saw plate. The dust-collecting hood has a first air-hole defined on a top and a second air-hole defined on a sidewall respectively to completely keep the swarf and dust inside the dust-collecting hood to sufficiently improve the dust-collecting efficiency. Moreover, the saw base and the saw cover have an enclosed sheet respectively to make the bottom opening narrowed to only allow the saw plate passing therethrough to further significantly improve the dust-collecting efficiency, to achieve highly efficiency for collecting swarf and dust, and to keep working environment clean.
A preferred embodiment of the circular saw is shown in
Additionally, a subsidiary hood 4 with an outlet 40 and an inlet 42 covers two sides of the saw plate 28 at the channel 26. Another sealing 5 is mounted to fill the gap between the subsidiary cover 4 and the working plate 20.
As shown in
Additionally, by defining the first air-hole 222 on the top 220 at the bottom opening 3 and the second air-hole 244 on the sidewall 242 facing the saw plate 28 on the dust-collecting hood, a negative pressure status is incurred by introducing air into the dust-collecting hood through the channel 26 when saw plate 28 rotates. Therefore, the dwarf and the dust cannot flow out of dust-collecting hood. By defining the first air-hole 222 and second air-hole 244, the negative pressure problem is resolved and the pressure balance is achieved.
Except the above-mentioned channel 26, by performing the first air-hole 222 on the saw base 22, a better airflow-trimming efficiency is achieved and also a dust-containing airflow and a clean airflow are separated. Thus, the circular saw 2 in the present invention not only improves the flow path of airflow but also discharge surplus dust in small quantity via the channel 26 by pressurizing efficiency of the first air-hole 222.
Moreover, by having the enclosed sheet 29 on the saw base 22 and the saw cover 24 respectively, the convection efficiency of airflow is increased and the bottom opening 3 is narrowed to only allow the saw plate 28 passing therethrough so that the swarf and dust generated by operation of the circular saw 2 are completely retained between the saw base 22 and the saw cover 24 to sufficiently improve the dust-collecting efficiency.
As shown in
Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present invention of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts any be resorted to without departing from the spirit and scope of the invention.
