Asphalt drum mixer with curved scoop-like mixing tips
US5380082A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Nov 23, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01C2019/109
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An asphalt drum mixer includes a rotating drum within a fixed sleeve which defines an annular chamber, and mixing tips mounted on the drum and in the annular chamber. The mixing tips pass through the hot mix asphalt laying in the bottom of the annular chamber and mix and shear the hot mix asphalt and increase its residence time in the drum mixer. In one preferred embodiment, the mixing tips may comprise curved scoop-like elements which lift the hot mix asphalt higher than conventional paddles and greatly increase residence time of the mix in the drum over conventional paddles. The quality of the mix is thus greatly improved. In another preferred embodiment the mixing tips may comprise curved scoop-like elements having slots which greatly increase sheering of the hot mix asphalt, thereby further improving the quality of the mix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.