The present invention relates to circular saw technology and more particularly, to a circular saw and a dust collector for a circular saw.
Referring to
This dust collection measure has been widely used. However, because the dust bag 4 is shaped like a blade and the bottom end of the dust bag 4 is disposed above the elevation of the suction hole 203, when the operator biases the swinging portion 202 and the saw blade 3 upwards relative to the mounting portion 201 and then biases the swinging portion 202 and the saw blade 3 downwards relative to the mounting portion 201 during the cutting operation, as shown in
Further, the dust bag 4 has limited space for collecting dust. Thus, it is necessary to frequently shut down the machine and clean up the dust bag, which complicates the operation.
Moreover, if the length of the dust bag 4 is extended in order to increase the dust collection space, the dust bag 4 can interfere with the operation of the machine.
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a dust collector, which provides sufficient space for collecting dust, and is elastically deformable to avoid interference with the operation of the machine.
It is another object of the present invention to provide a dust collector in a circular saw, which prevents collected dust from reversely falling to the outside, facilitates dust collection over a long time, and is convenient to use.
To achieve these and other objects of the present invention, a dust collector comprises a dust bag. The dust bag is flexible, comprising a connecting end, an opposing bottom end, and an elastically deformable extending portion connected between the connecting end and the bottom end.
To achieve these and other objects of the present invention, a circular saw having a dust collector comprises a worktable, a suspension arm disposed above the worktable, a saw blade mounted at a distal end of the suspension arm, and a dust collector. The suspension arm comprises a mounting portion connected to the worktable, and a swinging portion pivotally connected to the mounting portion. The dust collector comprises a suction hole and a dust collection unit. The suction hole is located in one end of the swinging portion of the suspension arm adjacent to the mounting portion, defining a bottom opening that faces downwardly in a tangential manner relative to the cutting edge of the saw blade and an upward-facing top opening opposite to the downward-facing bottom opening. The dust collection unit is mounted at the suspension arm to face toward the suction hole, and comprises a flexible dust bag. The dust bag comprises a connecting end fastened to the top opening, and an opposing bottom end disposed below the elevation of the top opening.
The present invention achieves the following advantages and effects. The flexible characteristic of the dust bag of the dust collector prevents interference with the operation of the machine. Subject to the feature that the bottom end of the dust bag of the dust collection unit is disposed below the elevation of the top opening of the suction hole, the dust thrown away by the saw blade can be smoothly guided through the suction hole to the bottom end of the dust bag, and the collected dust can be prohibited from reversely falling out of the dust bag.
Other advantages and features of the present invention will be understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference characters denote like elements of structure.
It should be noted that the drawing figures are not necessarily drawn to scale, but instead are drawn to provide a better understanding of the components thereof, and are not intended to be limiting in scope, but rather to provide exemplary illustrations. It should further be noted that the figures illustrate exemplary embodiments of the present invention and the components thereof, and in no way limits the structures, configurations and components thereof according to the present disclosure.
Referring to
The suction hole 10 is located in one end of the swinging portion 140 of the suspension arm 110 adjacent to the mounting portion 130, defining a bottom opening 11 that faces downwardly tangential to the cutting edge of the saw blade 120 and an upward-facing top opening 12 opposite to the downward-facing bottom opening 11.
The dust collection unit 20 comprises a breathable and flexible dust bag 21, and a rigid support material 22 mounted inside the dust bag 21. The dust bag 21 is made from a breathable fabric.
The dust bag 21 comprises a connecting end 211 detachably fastenable to the top opening 12 by the binding member 30, a bottom end 212 opposite to the connecting end 211, an extending portion 213 connected between the connecting end 211 and the bottom end 212, an inner circumference 214 extending from the connecting end 211 to the bottom end 212, and a sealing member 215 mounted at the bottom end 212. The bottom end 212 is disposed at a relatively lower place than the top opening 12. In this embodiment, the position of the bottom end 212 of the dust bag 21 is also lower than the elevation of the bottom opening 11. Based on the flexible material property of the dust bag 21, the extending length of the extending portion 213 is adjustable. Further, in this embodiment, the sealing member 215 is a zipper, operable to close or open the bottom end 212. In this embodiment, the stretched length of the rigid support material 22 mates with the extended length of the extending portion 213. The rigid support material 22 is a stretchable rigid coil adapted to support the inner circumference 214 in shape, such that when adjusting the extending length of the extending portion 213, the rigid support material 22 is elastically deformed in the extending direction of the extending portion 213.
Referring to
Referring to
After a period of time in use, the operator can open the sealing member 215, and then clean up the dust that has accumulated in the bottom end 212.
Therefore, the invention has many advantages, such as the following:
It should further be appreciated that the coil design of the rigid support material 22 does not limit operation of the device. Alternatively, the rigid support material 22 can be composed of a plurality of rigid ring frames (not shown) fastened to the inner circumference 214 of the dust bag 21 and spaced from one another along the length thereof. These rigid ring frames can be variously configured in any of a variety of shapes, not limited to rectangular or circular shapes.
Referring to
The dust container 40 provides a larger space for collecting dust. Further, the dust container 40 has a three-dimensional shape, which facilitates positioning and gives better positionability. Further, the arrangement of the connection device 50 facilitates connection and disconnection between the dust bag 21 and the dust container 40.
In conclusion, the present invention provides a dust collector for a circular saw that has a simple structure and is easy to fabricate and install, and can achieve optimal dust collection performance. Therefore, the dust collector can readily achieve the aforementioned objects of the present invention.
Although particular embodiment of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Number | Date | Country | Kind |
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103104598 | Feb 2014 | TW | national |