US3835626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner
Assignee: Sanyo Electric Co Ltd
•
Filing: 1971-11-04
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Granted: 1974-09-17
•
Expires: 1991-11-04
Abstract
Abstract A vacuum cleaner including a two-stage filtering system positioned within a cleaner body for filtering the air before it passes through an electric motor fan unit. The two-stage filtering system comprises a first dust collecting receptacle having incorporated therein a filtering screen of a relatively large mesh size and detachably positioned within the cleaner body. The filtering system further includes a second filtering member of fine mesh size located immediately downstream of the first dust collecting receptacle within the cleaner body with its inlet opening communicating with the outlet opening of the first receptacle. Air with entrained dirt and dust particles taken into the cleaner body passes initially through the first receptacle where dust having a relatively large size is filtered from the air stream by the filtering screen and through the second filtering member where fine dust particles are removed from the air flow.
Inventors
- 👤 Y Miyake
- 👤 H Kashiwara
- 👤 J Mizukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1409; A47L5/00; A47L5/12; A47L5/22; A47L5/36; A47L5/362; A47L9/102; B; B01; B01D; B01D50/00; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
368 words
A tank type vacuum cleaner comprising a main housing having a recessed portion, a demountable case attached to said main housing formed to provide a dust collecting chamber, said case located in said recessed portion and forming a portion of the overall contour of said main housing and extending into the interior of said main housing, said case having an inlet opening and an outlet opening, said main housing having an inlet fitting adapted for connection to a suction hose through which collected particles are supplied to the vacuum cleaner, the outlet of said inlet fitting and said inlet fitting being separate from but in fluid flow communication with the inlet opening of said case when said case is mounted to said main housing, filter screen means located on said case and attached thereto covering the outlet opening thereof and having a portion thereof of relatively large mesh size located within in the fluid flow path between the inlet and outlet openings of said case so that particles of a relatively large size can be accumulated thereon and compressed in a layer to form an additional medium which can filter particles of relatively smaller sizes, the interior of said case also collecting particles of dust which do not pass through said filter screen, means forming a passage within said main housing, a filter bag located in said passage mounted separately from said case and having an inlet end in fluid flow communication with and covering the outlet opening of said case when said case is mounted to said main housing, means on said housing providing access to the interior of said passage and to said filter bag, said means forming said passage in which said filter bag is located also formed with an exhaust opening, a motor-fan unit located in said main housing adjacent said exhaust opening of said passage to produce upon operation thereof a fluid flow stream with collected particles entrained therein from said main housing inlet fitting, then through the inlet opening on the case, the filter screen and the outlet opening of the case, the filter bag and said exhaust passage, the particles passing through said filter screen being collected in said filter bag.
Claim 2
Dependent Claim
368 words
A tank type vacuum cleaner comprising a main housing having a recessed portion, a demountable case attached to said main housing formed to provide a dust collecting chamber, said case located in said recessed portion and forming a portion of the overall contour of said main housing and extending into the interior of said main housing, said case having an inlet opening and an outlet opening, said main housing having an inlet fitting adapted for connection to a suction hose through which collected particles are supplied to the vacuum cleaner, the outlet of said inlet fitting and said inlet fitting being separate from but in fluid flow communication with the inlet opening of said case when said case is mounted to said main housing, filter screen means located on said case and attached thereto covering the outlet opening thereof and having a portion thereof of relatively large mesh size located within in the fluid flow path between the inlet and outlet openings of said case so that particles of a relatively large size can be accumulated thereon and compressed in a layer to form an additional medium which can filter particles of relatively smaller sizes, the interior of said case also collecting particles of dust which do not pass through said filter screen, means forming a passage within said main housing, a filter bag located in said passage mounted separately from said case and having an inlet end in fluid flow communication with and covering the outlet opening of said case when said case is mounted to said main housing, means on said housing providing access to the interior of said passage and to said filter bag, said means forming said passage in which said filter bag is located also formed with an exhaust opening, a motor-fan unit located in said main housing adjacent said exhaust opening of said passage to produce upon operation thereof a fluid flow stream with collected particles entrained therein from said main housing inlet fitting, then through the inlet opening on the case, the filter screen and the outlet opening of the case, the filter bag and said exhaust passage, the particles passing through said filter screen being collected in said filter bag.
Claim 3
Dependent Claim
22 words
The vacuum cleaner of claim 1 wherein said inlet and outlet openings for said case are part of said filter screen means.
Claim 4
Dependent Claim
79 words
A tank type vacuum cleaner as in claim 1 wherein said filter screen has an elongated generally cylindrical portion which extends into said dust collecting case and defines a continuous surface, the inlet of said filter bag opening into said elongated portion of said filter screen so that the particles collected in said filter bag can be emptied into said filter screen and held therein for later removal when the dust collecting case is detached from said main housing.
Claim 5
Dependent Claim
34 words
The vacuum cleaner of claim 3 wherein said inlet and outlet openings for said case are part of said filter screen means and said elongated portion of said screen means overlies said outlet opening.
Claim 6
Dependent Claim
51 words
A vacuum cleaner according to claim 1 in which said inlet fitting is formed adjacent the top of said main housing and elongated in a substantially horizontal direction, said passage in which said filter bag is located being elongated and having a substantial portion thereof positioned beneath said elongated inlet fitting.
Claim 7
Dependent Claim
64 words
A vacuum cleaner according to claim 5 in which a portion of said elongated passage housing said filter bag lies forward of the front end of said inlet fitting and said dust collecting case is mounted to the rear of the outlet end of said inlet fitting and the end of the passage at which the inlet end of the filter bag is located.
Claim 8
Dependent Claim
25 words
A vacuum cleaner as in claim 5 in which said access means to said passage in which said filter bag is located comprises a lid.
Claim 9
Dependent Claim
41 words
A vacuum cleaner according to claim 5 in which said main housing has a rear end on which said housing may stand lengthwise, said access means to said passage containing said filter bag being accessible when said housing is standing lengthwise.
Claim 10
Dependent Claim
90 words
A vacuum cleaner according to claim 1 in which said inlet fitting is formed adjacent the top of said main housing and extends in a substantially vertical direction into said dust collecting case, said passage in which said filter bag is located being elongated and extending in a substantially horizontal direction so that the inlet end of said filter bag is adjacent and to the rear of said inlet fitting, said dust collecting case being located in said housing beneath said inlet fitting and a portion of said elongated passage.
References Cited (Backward Citations)
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Cited
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |