Floating vibrational screed
US4798494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1987 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Oct 28, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F21/242
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A vibrating screed for striking off, float finishing and vibrating plastic concrete in a single pass, without being supported upon forms. A rigid, buoyant pan which floats and supports the screed comprises a generally planar surface portion in contact with the plastic concrete and a terminal portion coupled to an associated blade assembly. The blade assembly includes a central L-bracket having a lower horizontal portion substantially parallel with the pan, which terminates in a leading edge adapted to first contact and strike-off unfinished concrete. An associated face plate includes a central portion adapted to be rigidly fastened to the pan terminal portion with the L-bracket substantially sandwiched therebetween. The face plate comprises a downwardly angled guard member which defines a flotation volume between itself and the lower L-bracket, and an upper, diverging wing portion which prevents the accumulation of stricken-off concrete interiorly of the pan. A plurality of spaced apart pneumatic vibrators responsive to external HP air vigorously vibrate the screed pan. A pair of handles pivotally associated with the frame facilitate screed manipulation by a pair of workmen who pul…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.