Mechanical pitch control
US7044682B2 · kind B2 · utility
2Cited by
20References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2003 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Dec 29, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F21/248
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A concrete finishing machine having a rotatable trowel blade assembly and a mechanism for controllably adjusting the pitch of the trowel blades relative to a wet concrete surface on which the blades rest. The machine's engine's drive shaft rotation itself is utilized to create changes in pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.