US5074044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust disposal attachment for a rotary element of a power tool
Assignee: International Surface Preparation Group Inc
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Filing: 1991-04-26
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Granted: 1991-12-24
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Expires: 2011-04-26
Abstract
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.
Inventors
- 👤 C. Warren Duncan
- 👤 William D. Glynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:21
CPC Classifications
B; B27; B27B; B27B9/00; B23; B23D; B23D59/00; B23D59/006; B23D59/0064; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0046; B24; B24B; B24B55/00; B24B55/06; B24B55/10; B24B55/102
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
101 words
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.
Claim 2
Dependent Claim
101 words
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.
Claim 3
Dependent Claim
65 words
A saw according to claim 1 wherein said blade guard includes a dust barrier plate having a shaft receiving opening therethrough and located on a side of said saw blade opposite said housing, and said impeller is mounted coaxially with said shaft remote from said housing, whereby said dust barrier plate serves as a partition that separates said dust confining channel from said impeller enclosure.
Claim 4
Dependent Claim
29 words
A saw according to claim 2 wherein said impeller confining structure is comprised of a bonnet secured to said blade guard and defining said dust transfer passageway interiorally therewithin.
Claim 5
Dependent Claim
36 words
A saw according to claim 3 wherein said bonnet is formed of a unitary interiorally concave molded shell and an interior partition secured therewithin to define said dust transfer passageway between said shell and said partition.
Claim 6
Dependent Claim
48 words
A saw according to claim 3 further comprising a shaft extension secured to said shaft and extending completely through said dust confining channel, through said shaft receiving opening in said dust barrier plate, and into said impeller enclosure, and said impeller is secured directly on said shaft extension.
Claim 7
Dependent Claim
41 words
A saw according to claim 1 further comprising a shaft extension attached to said shaft and extending entirely through said dust confining channel and protruding therebeyond through said blade guard, and power transmission means connecting said shaft extension to said impeller.
Claim 8
Dependent Claim
21 words
A saw according to claim 6 further characterized inn that said power transmission means is comprised of a belt drive system.
Claim 9
Dependent Claim
120 words
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.
Claim 10
Dependent Claim
120 words
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.
Claim 11
Dependent Claim
66 words
A dust control attachment according to claim 8 wherein said blade guard has a dust barrier plate with a shaft receiving opening therethrough located on a side of said rotary blade remote from said housing, said impeller is mounted coaxially relative to said shaft, and said enclosing structure is formed as a bonnet attached to said blade guard to define said dust transfer passageway interiorally therewithin.
Claim 12
Dependent Claim
27 words
A dust control attachment according to claim 9 further comprising a shaft extension attached to said shaft, and said impeller is mounted directly on said shaft extension.
Claim 13
Dependent Claim
49 words
A dust control attachment according to claim 10 wherein said bonnet is formed as a unitary molded, interiorally concave shell and an interior partition disposed within said shell to define said dust transfer passageway between said interior partition and a portion of the interior surface of said molded shell.
Claim 14
Dependent Claim
28 words
A dust control attachment according to claim 8 further comprising power transmission means interposed between said shaft and said impeller to drive said impeller remotely from said shaft.
Claim 15
Dependent Claim
18 words
A dust control attachment according to claim 12 wherein said power transmission means includes a belt drive system.
Claim 16
Dependent Claim
155 words
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.
Claim 17
Dependent Claim
155 words
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.
Claim 18
Dependent Claim
22 words
An attachment according to claim 14 further comprising a shaft extension secured to said shaft and upon which said impeller is mounted.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |