Actuator for the release of an automatic emergency brake of a hand-operated powered tool
US4573556A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Apr 12, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D59/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Actuator for the release of automatic emergency brakes of hand-operated, powered tools, such as chain saws, having a driving shaft for the tool. Such emergency brakes are constituted of a brake mechanism released by means of stored energy. The actuator is constituted of a rotatable and balanced body with a small amount of friction on a shaft situated essentially parallel to the driving shaft. The actuator is fabricated of a permeable material, and has a mass having an essential inertia against rotation on the shaft. The actuator cooperates firstly with a magnet retaining the actuator with a predetermined magnetic force against rotation in an angular position of the actuator, and then with a sensor which is so arranged that an impulse for releasing the brake mechanism is given as soon as the actuator comes out of said angular position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.