Rotary cutting head for mowers equipped with flexible cutting blades
US4097991A · kind A · utility
Inventor
Key dates
| Filing date | Sep 10, 1976 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Sep 10, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D34/416
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved cutting head for rotary mowers, trimmers and edgers for vegetation is constructed with a generally cylindrical rotating body from which flexible flair-like cutting blades extend radially in a plane orthogonal to the rotational axis. The flails are preferentially formed of nylon monofilament and exit through grommets secured in the rotating body. The inner and outer portions of the channels through the grommets are flared into curvilinear funnels to allow the blade filaments to be flexed in any direction without undue stress. The flails are additionally protected by circumferential flanges running around the periphery of the cutting head, above and below the cutting plane, which project to radial dimensions beyond the outer lips of the grommets to prevent the filaments from being trapped between the body and a foreign object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.