US4100878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner dust container filling indicator device
Assignee: Electrolux AB
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Filing: 1976-12-02
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Granted: 1978-07-18
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Expires: 1996-12-02
Abstract
Abstract An indicator mounted on a vacuum cleaner housing for showing at any given time the degree of filling of the dust container. The indicator includes bellows which are connected to both the outside of the dust container and the interior of the vacuum cleaner housing whereby the bellows are acted upon under the influence of the changing pressure differential to respectively expand or contract the bellows thereby indicating the degree of clogging of the dust container.
Inventors
- 👤 Karl Eric Leinfelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:37
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
An indicator device for a vacuum cleaner visible from the outside thereof and showing the amount of filling of a vacuum cleaner dust container comprising: a casing for said indicator device having a transparent portion, a pair of resilient spaced closed bodies in said casing, a frame for said closed bodies in said casing, means interconnecting said closed bodies and mounted in said casing, said means comprising a frame having end pieces each of which is secured to an adjacent one of said closed bodies and arranged laterally of its respective end piece, a conduit connecting one of said closed bodies to the atmosphere, another conduit connecting the other of said closed bodies to the interior of said dust container, said closed bodies acting under the influence of the pressure differential between the atmosphere and the interior of said dust container to expand and contrast said closed bodies so that movement occurs linearly in said indicator device which can be visually observed through said transparent portion to indicate the amount of filling present at any given time in said dust container.
Claim 2
Dependent Claim
181 words
An indicator device for a vacuum cleaner visible from the outside thereof and showing the amount of filling of a vacuum cleaner dust container comprising: a casing for said indicator device having a transparent portion, a pair of resilient spaced closed bodies in said casing, a frame for said closed bodies in said casing, means interconnecting said closed bodies and mounted in said casing, said means comprising a frame having end pieces each of which is secured to an adjacent one of said closed bodies and arranged laterally of its respective end piece, a conduit connecting one of said closed bodies to the atmosphere, another conduit connecting the other of said closed bodies to the interior of said dust container, said closed bodies acting under the influence of the pressure differential between the atmosphere and the interior of said dust container to expand and contrast said closed bodies so that movement occurs linearly in said indicator device which can be visually observed through said transparent portion to indicate the amount of filling present at any given time in said dust container.
Claim 3
Dependent Claim
20 words
The indicator device as claimed in claim 1 wherein both of said closed bodies are in the form of bellows.
Claim 4
Dependent Claim
31 words
The indicator device as claimed in claim 1 wherein said means interconnecting wherein said frame is in the form of a U-shaped carrier movable from an initial position to another position.
Claim 5
Dependent Claim
39 words
The indicator device as claimed in claim 3 wherein both of said closed bodies are bellows, and each leg of the U-shaped carrier is secured to an adjacent bellows, with the latter being arranged outside of the respective legs.
Claim 6
Dependent Claim
33 words
The indicator device as claimed in claim 3 further comprising a support for said indicator device, a spring connected between said frame and said support which biases said frame into its initial position.
Claim 7
Dependent Claim
34 words
The indicator device as claimed in claim 5 further comprising a blocking assembly on said frame and said support for retaining the latter in the position it has moved to at any given time.
Claim 8
Dependent Claim
40 words
The indicator device as claimed in claim 6 wherein said blocking assembly includes a notched surfaces secured to the legs of said U-shaped carrier and arranged therebetween, a pawl-like element secured to said support and coacting with said notched surface.
Claim 9
Dependent Claim
56 words
The indicator device as claimed in claim 7 further comprising a finger-activated knob projecting out of said casing and means mounting said support for limited swinging movement so that when said knob is depressed externally said support is rotated against the pressure of said spring to release the pawl-like element from engagement with said notched surface.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |