Dust disposal attachment for a rotary element of a power tool
First Claim
1. In a saw having a housing, a rotary shaft extending from said housing, and a circular saw blade attached to said rotary shaft, the improvement comprising a dust control attachment including a blade guard attached to said housing to define a dust confining channel about the periphery of a portion of said circular saw blade, an impeller coupled to said rotary shaft and residing outside of said dust confining channel, and an impeller confining structure defining an impeller enclosure, an impeller dust discharge outlet from said impeller enclosure, and a dust transfer passageway to said impeller from said dust confining channel.
2 Assignments
0 Petitions
Accused Products
Abstract
An attachment is provided for a saw or other power tool having a rotary shaft and a circular blade mounted on the shaft. A substitute saw blade guard is fastened on the saw housing to define a dust confining channel about the periphery of a portion of the circular rotary saw blade. A shaft extension is fastened to the exposed tip of the shaft and an impeller is fastened to the shaft extension outside of the dust confining channel. A bonnet with an internal dust transfer passageway is secured relative to the dust guard to confine the impeller within an impeller enclosure. Operation of the rotary blade causes the impeller to rotate to create a suction, thereby drawing air and dust from the channel about the periphery of the rotary blade and into the vortex created at the axial center of the impeller. The impeller discharges air laden with dust from a discharge outlet in the impeller bonnet.
98 Citations
15 Claims
- 1. In a saw having a housing, a rotary shaft extending from said housing, and a circular saw blade attached to said rotary shaft, the improvement comprising a dust control attachment including a blade guard attached to said housing to define a dust confining channel about the periphery of a portion of said circular saw blade, an impeller coupled to said rotary shaft and residing outside of said dust confining channel, and an impeller confining structure defining an impeller enclosure, an impeller dust discharge outlet from said impeller enclosure, and a dust transfer passageway to said impeller from said dust confining channel.
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8. A dust control attachment for a saw having a housing and a rotary blade secured for rotation on a shaft comprising:
- a blade guard secured on one side to said housing and forming a dust confining channel about a portion of the periphery of said rotary blade and also forming a dust confining cavity within which said blade rotates, an impeller coupled to said shaft and located outside of said dust confining cavity, an enclosing structure mounted to said housing to form an impeller cavity and to enclose said impeller within said impeller cavity and defining a dust transfer passageway from said dust confining channel to said impeller cavity and further defining a dust discharge outlet from said impeller cavity.
- View Dependent Claims (9, 10, 11, 12, 13)
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14. An attachment for a power tool having a disk-shaped rotatable element mounted relative to a housing for rotation on a rotary shaft having an axis and extending from said housing comprising:
- a guard secured too said housing and having an edge and opposite sides forming an arcuate channel about a portion of the periphery of said rotatable element and defining a dust passage opening to said channel and including a dust barrier plate on a side of said guard remote from said housing wherein said dust barrier plate defines a shaft opening aligned with said shaft axis, an impeller axially coupled to said rotary shaft remote from said housing, and a bonnet secured relative said housing to confine said impeller therewithin and defining a dust passage from said dust passage opening in said guard to the axial center of said impeller and defining a dust discharge outlet tangentially aligned with the periphery of said impeller.
- View Dependent Claims (15)
Specification