Patent US3615819A successfully refreshed from Google Patents.
US3615819A
Expired / Lapsed
US
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Nap-surface cleaning with tuned frequency beaters
Assignee: Bissell Inc
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Filing: 1970-01-19
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Granted: 1971-10-26
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Expires: 1990-01-19
Abstract
Abstract A nap-surface cleaning device includes a plurality of flexible rodlike beaters which oscillate to beat the surface and loosen dirt embedded therein. A motor drives the rods at a beating frequency. The rods are constructed so that their natural resonant frequency is closed correlated with the beating frequency.
Inventors
- 👤 Thomas K Cauley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:55
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
20 words
The device of claim 1 which includes: means to limit the upward excursion distance of the oscillating beater rod means.
Claim 2
Dependent Claim
24 words
The device of claim 2 in which said limiting means comprises: a relatively firm pad disposed above said rod means for striking engagement thereby.
Claim 3
Dependent Claim
25 words
The device of claim 1 which includes: means to remove dirt from the nap surface after the dirt has been loosened by said rod means.
Claim 4
Dependent Claim
25 words
The device of claim 3 which includes: means to remove dirt from the nap surface after the dirt has been loosened by said rod means.
Claim 5
Dependent Claim
18 words
The device of claim 1 in which said beater rod means comprises a plurality of spaced beater rods.
Claim 6
Independent Claim
44 words
A method of cleaning a nap surface, comprising: a. providing flexible beater rod means having a given natural resonant frequency, b. and oscillatingly driving said rod means against the nap surface at a beating frequency which is slightly less than said natural resonant frequency.
Claim 7
Dependent Claim
38 words
The method of claim 7: a. in which the oscillation of said rod means provides upward and downward excursions from the neutral position, b. and which includes the step of limiting the upward excursion of said rod means.
Claim 8
Dependent Claim
22 words
The method of claim 7 which includes the step of removing dirt loosened from the nap surface by said beater rod means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |