Patent US4028765A successfully refreshed from Google Patents.
US4028765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floor or carpet sweeper
Assignee: Leifheit International GmbH
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Filing: 1976-07-19
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Granted: 1977-06-14
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Expires: 1996-07-19
Abstract
Abstract A floor or carpet sweeper has a hollow housing provided on its lower side with a plurality of floor-engaging wheels. The bottom of the housing is closed by means of a cover plate which is pivoted on the housing about an axis perpendicular to the forward and backward direction of travel of the housing during sweeping. This cover plate is formed with a throughgoing hole and is provided with upwardly bent tabs on which a cylindrical brush is rotatably mounted, this brush extending through the hole in the plate. In addition the ends of the brush are engageable with the wheels when the cover plate is closed on the housing so that the brush is rotatably driven by these wheels. A magnet holds the cover plate in place on the bottom of the housing and engages against an inclined surface on this cover plate. This magnet can be moved along the inclined surfaces so as to vary the height setting of the brush.
Inventors
- 👤 Johannes Liebscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/32; A47L11/33
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
124 words
A carpet or floor sweeper comprising: a housing displaceable forwardly and oppositely backwardly in a normal direction of travel and having an open bottom; a plurality of floor-engaging wheels rotatable on said housing; a cover plate closing said bottom of said housing and formed with a central hole and forming to at least one side of said hole a dust-catching receptacle; means pivoting said plate on said housing about an axis extending transverse to said direction; a rotatable brush elongated transverse to said direction extending through said hole; means mounting the elongated brush on said cover plate for rotation of said elongated brush about its longitudinal axis; and means operatively connecting said brush to said wheels for rotation of said brush by said wheels.
Claim 2
Dependent Claim
124 words
A carpet or floor sweeper comprising: a housing displaceable forwardly and oppositely backwardly in a normal direction of travel and having an open bottom; a plurality of floor-engaging wheels rotatable on said housing; a cover plate closing said bottom of said housing and formed with a central hole and forming to at least one side of said hole a dust-catching receptacle; means pivoting said plate on said housing about an axis extending transverse to said direction; a rotatable brush elongated transverse to said direction extending through said hole; means mounting the elongated brush on said cover plate for rotation of said elongated brush about its longitudinal axis; and means operatively connecting said brush to said wheels for rotation of said brush by said wheels.
Claim 3
Dependent Claim
81 words
The sweeper defined in claim 1 wherein said brush has two end portions and said plate has a tab portion adjacent each of said end portions and forming with the respective end portion a respective portion pair, one of each of said portions of each pair having a cylindrical hole centered on the brush rotation axis and the other portion of each pair having a pin received in said cylindrical hole, said pins and said cylindrical holes constituting said means mounting.
Claim 4
Dependent Claim
15 words
The sweeper defined in claim 2 wherein said pins are provided on said tab portions.
Claim 5
Dependent Claim
19 words
The sweeper defined in claim 3 wherein said plate is unitarily formed of sheet metal with said tab portions.
Claim 6
Dependent Claim
15 words
The sweeper defined in claim 4 wherein said pins are riveted in said tab portions.
Claim 7
Dependent Claim
24 words
The sweeper defined in claim 1, further comprising means for pivotally varying the position of said cover plate and said brush on said housing.
Claim 8
Dependent Claim
28 words
The sweeper defined in claim 6 wherein said means for varying includes a displaceable abutment on said housing engageable with said plate remote from the pivot axis thereof.
Claim 9
Dependent Claim
23 words
The sweeper defined in claim 7 wherein said plate has a surface inclined relative to said pivot axis and engageable with said abutment.
Claim 10
Dependent Claim
16 words
The sweeper defined in claim 8 wherein said plate has a bent-up tongue constituting said surface.
Claim 11
Dependent Claim
26 words
The sweeper defined in claim 9 wherein said plate is generally planar and said bent-up tongue has an edge inclined to the plane of said plate.
Claim 12
Dependent Claim
30 words
The sweeper defined in claim 6, further comprising a magnet engageable with said plate at a location remote from the pivot axis thereof for holding said plate on said housing.
Claim 13
Dependent Claim
32 words
The sweeper defined in claim 11 wherein said magnet constitutes said abutment and said means for varying includes a handle actuatable from outside said housing for displacing said magnet on said housing.
Claim 14
Dependent Claim
27 words
The sweeper defined in claim 12, further comprising a window on said housing and indicia carried by said abutment visible from outside said housing through said window.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |