Lawn mower blade rotation warning device
US4152881A · kind A · utility
8Cited by
8References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 5, 1977 |
| Grant date | May 8, 1979 |
| Priority date | — |
| Expiry date | May 5, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/20408
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A warning device for a lawn mower having a rotary blade driven from a motor through a centrifugal clutch and normally held stopped by a brake which is released by a deadman control. A clicker arm is pivoted to the clutch driver and spring-pressed toward engagement with the driven clutch drum so as to repeatedly strike a notch therein and sound a warning in the event the motor stops and thereby stops the driving clutch element while the brake is disengaged and allows the blade to spin from its own momentum. A centrifugal weight connected to the clicker arm retracts it when the clutch drive is operating normally.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.