Patent US4435877A successfully refreshed from Google Patents.
US4435877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise reducing means for vacuum cleaner
Assignee: SHOP-VAC Corp A CORP OF NJ
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Filing: 1982-09-30
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Granted: 1984-03-13
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Expires: 2002-09-30
Abstract
Abstract A noise muffler for a vacuum cleaner is constructed of flexible open cell foam inserts, one of which extends across an opening through which working air flows between two plenums. At this opening the foam insert is provided with a plurality of relatively large perforations. Similar perforations may be provided at the ends of the other insert, this other insert being in the downstream plenum.
Inventors
- 👤 Robert C. Berfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:23
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/0081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A vacuum cleaner including a bypass-type blower motor, a main blower fan connected to said motor and driven thereby to create a stream of working air, a dust filter located in said stream and upstream of said fan, said stream also extending through first and second plenums disposed downstream of said fan with said second plenum being downstream of said first plenum, partition means defining said plenums and including a first partition separating said plenums, said first partition having an opening through which said working air flows from said first plenum to said second plenum, sound muffler means including a section extending across said opening and through which said working air flows in leaving said first plenum and entering said second plenum, said section being constructed of foam material and having a plurality of relatively large perforations aligned with said opening.
Claim 2
Dependent Claim
141 words
A vacuum cleaner including a bypass-type blower motor, a main blower fan connected to said motor and driven thereby to create a stream of working air, a dust filter located in said stream and upstream of said fan, said stream also extending through first and second plenums disposed downstream of said fan with said second plenum being downstream of said first plenum, partition means defining said plenums and including a first partition separating said plenums, said first partition having an opening through which said working air flows from said first plenum to said second plenum, sound muffler means including a section extending across said opening and through which said working air flows in leaving said first plenum and entering said second plenum, said section being constructed of foam material and having a plurality of relatively large perforations aligned with said opening.
Claim 3
Dependent Claim
69 words
A vacuum cleaner as set forth in claim 1 in which the muffler means also includes another section disposed inside said second plenum and positioned so that working air flowing through said section impinges upon a face of said another section at the central region thereof and divides to flow toward opposite ends of said another section and be discharged from said second plenum through exhaust opening means thereof.
Claim 4
Dependent Claim
22 words
A vacuum cleaner as set forth in claim 1 or 2 in which the foam material is of the open cell type.
Claim 5
Dependent Claim
19 words
A vacuum cleaner as set forth in claim 1 or 2 in which said first partition is generally arcuate.
Claim 6
Dependent Claim
23 words
A vacuum cleaner as set forth in claim 2 in which said first and second sections comprise respective first and second sheet members.
Claim 7
Dependent Claim
43 words
A vacuum cleaner as set forth in claim 5 in which the second sheet member is elongated and each end thereof is provided with a plurality of relatively large perforations through which said working air flows prior to reaching said exhaust opening means.
Claim 8
Dependent Claim
24 words
A vacuum cleaner as set forth in claims 5 or 6 in which said sheet members are flexible inserts retained in generally arcuate configurations.
Claim 9
Dependent Claim
16 words
A vacuum cleaner as set forth in claim 1 in which sid first partition is arcuate.
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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |