Patent US4503207A successfully refreshed from Google Patents.
Patent US4663799A successfully refreshed from Google Patents.
US4663799A
Expired / Lapsed
US
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Dust collector
Assignee: Komatsu Zenoah Co
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Filing: 1986-01-23
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Granted: 1987-05-12
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Expires: 2006-01-23
Abstract
Abstract Dust collection apparatus is disclosed adapted for both vacuuming and blowing/sweeping functions. The apparatus consists of a single, self-contained unit comprising a blower, a cleaning hose, an engine, a collecting area, inlet and outlet passages, and a switching valve which can switch the internal airflow so as to convert the cleaning hose from a vacuuming function to a blowing/sweeping function.
Inventors
- 👤 Katsumi Kiyooka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:48
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A dust collector comprising a blower having an inlet opening and a discharge opening, a cleaning hose, an engine having a cylinder for driving said blower, a collection area which is communicated with said inlet opening to collect dust that is drawn in by said cleaning hose, an inlet passage communicated with said collection area, a discharge passage communicated with said discharge opening, a switching valve which can switch and connect said cleaning hose to one of said inlet passage and said discharge passage with the other closed and an opening-closing valve which opens said inlet passage 51 to the atmosphere when said cleaning hose is connected to said discharge passage wherein, a portion of the discharge air from said blower 26 is branched off and made to go around the outside of said cylinder of said engine.
Claim 2
Dependent Claim
138 words
A dust collector comprising a blower having an inlet opening and a discharge opening, a cleaning hose, an engine having a cylinder for driving said blower, a collection area which is communicated with said inlet opening to collect dust that is drawn in by said cleaning hose, an inlet passage communicated with said collection area, a discharge passage communicated with said discharge opening, a switching valve which can switch and connect said cleaning hose to one of said inlet passage and said discharge passage with the other closed and an opening-closing valve which opens said inlet passage 51 to the atmosphere when said cleaning hose is connected to said discharge passage wherein, a portion of the discharge air from said blower 26 is branched off and made to go around the outside of said cylinder of said engine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |