Lawn mower blade control apparatus
US4148173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Jan 3, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D2101/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lawn mower blade mounted coaxially at the bottom of a vertical engine drive shaft is normally de-clutched from the shaft and stopped by a brake. When the engine is accelerated, the blade is released by the brake and clutched by a centrifugal clutch to the engine driven shaft. The blade carrier and clutch and brake drum are included in a compact assembly on a hub and mounted as a unit on the engine shaft. To replace the flywheel effect normally provided by a blade fixedly mounted on the engine shaft, the unitary assembly also includes a flywheel mounted on the hub. The assembly and flywheel are protected from blade cuttings by a protective bowl shaped to surround the flywheel and form a mounting platform for a brake band about the drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.