A rotary mower having a drive assembly which provides automatic de-clutching and prompt braking of the mower blade to a stop when the device is left unattended, while the engine keeps running. A blade carrier is mounted on an anti-friction bearing at the lower end of the drive shaft. A driving hub is...http://www.google.de/patents/US4306405?utm_source=gb-gplus-sharePatent US4306405 - Drive assembly for rotary mower or the like
