US4766639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking device for a vacuum cleaner
Assignee: Electrolux AB
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Filing: 1988-01-11
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Granted: 1988-08-30
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Expires: 2008-01-11
Abstract
Abstract In a vacuum cleaner having a disposable dust bag of the kind comprising an attachment plate of cardboard or the like, and a cover adapted to be opened for the replacement of the dust bag, a blocking device is provided which is adapted to prevent closing of the cover when the dust bag is missing. The blocking device includes a slide actuated by a spring to be moved to a first position in which the closing of the cover is prevented, and a toggle-joint mechanism adapted to be actuated by the attachment plate to move the slide to a second position for permitting closing of the cover.
Inventors
- 👤 Nils T. Lindquist
- 👤 Ann-Christine Hedin
- 👤 Kurt O. Francke
- 👤 Milos Vukotic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:34
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1427; A47L9/1472; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A vacuum cleaner, having a dust bag of the type provided with a rigid attachment plate, comprising: an openable cover for replacement of said dust bag, a blocking device for preventing the closing of said cover when a dust bag is missing in the vacuum cleaner, said blocking device including a slide, a resilient member biasing said slide to a first position within said vacuum cleaner whereby closing of said cover is prevented when the dust bag is missing in said vacuum cleaner, and a toggle joint mechanism actuated by said attachment plate to move said slide to a second position whereby the closing of said cover is permitted.
Claim 2
Dependent Claim
109 words
A vacuum cleaner, having a dust bag of the type provided with a rigid attachment plate, comprising: an openable cover for replacement of said dust bag, a blocking device for preventing the closing of said cover when a dust bag is missing in the vacuum cleaner, said blocking device including a slide, a resilient member biasing said slide to a first position within said vacuum cleaner whereby closing of said cover is prevented when the dust bag is missing in said vacuum cleaner, and a toggle joint mechanism actuated by said attachment plate to move said slide to a second position whereby the closing of said cover is permitted.
Claim 3
Dependent Claim
15 words
A vacuum cleaner as claimed in claim 1 wherein said resilient member is a spring.
Claim 4
Dependent Claim
40 words
A vacuum cleaner as claimed in claim 1 wherein said toggle joint mechanism includes two links which are pivotally interconnected, and in which one link is hinged to a stationary axis and the other link is hinged to said slide.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |