Patent US3883259A successfully refreshed from Google Patents.
US3883259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screeding beam for concrete
Assignee: Dynapac AB
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Filing: 1973-12-06
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Granted: 1975-05-13
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Expires: 1993-12-06
Abstract
Abstract This device, used for screeding newly placed concrete, or similar plastic materials, when constructing floor slabs or similar objects, comprises two horizontal beams capable of movement relative to one another. The beams are attached by means of flexible connecting rods and are moved relative to one another by a crankshaft or weight eccentrically mounted on a motor connected to one of the beams.
Inventors
- 👤 Sture Berg
- 👤 Torsten Fors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:24
CPC Classifications
E; E04; E04G; E04G21/00; E04G21/02; E04G21/06; E04G21/063; E04G21/066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A screeding beam for compacting concrete or similar plastic masses which comprises: a. two parallel, coplanar beams connected by a flexible assembly comprising leaf springs; and b. a motor mounted on one of said beams, the shaft of said motor having an eccentrically mounted connecting rod attached to the other of said beams adapted to cause said beams to describe an oscillatory motion relative to one another.
Claim 2
Dependent Claim
67 words
A screeding beam for compacting concrete or similar plastic masses which comprises: a. two parallel, coplanar beams connected by a flexible assembly comprising leaf springs; and b. a motor mounted on one of said beams, the shaft of said motor having an eccentrically mounted connecting rod attached to the other of said beams adapted to cause said beams to describe an oscillatory motion relative to one another.
Claim 3
Dependent Claim
18 words
The screeding beam of claim 1 further comprising a weight eccentrically mounted on the shaft of said motor.
Claim 4
Dependent Claim
25 words
The screeding beam of claim 2 wherein said eccentrically mounted weight rotates in a plane which is perpendicular to the longitudinal axes of said beams.
Claim 5
Dependent Claim
14 words
The screeding beam of claim 1 further comprising means for vertically vibrating said beams.
Claim 6
Dependent Claim
25 words
The screeding beam of claim 4 wherein said means for vertically vibrating said beams comprises a vertical vibrating element mounted on one of said beams.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |