Vacuum cleaner accessory pipe - contains propeller rotating freely on coaxial spindle to kill any wasps sucked in

摘要

The circular-section pipe is for use a vacuum cleaner accessory which is used when dealing with wasps' nests. It contains a coaxial spindle (3) on which a propeller-type fan (4), rotates freely, driven by the air stream, its blades (5) extending close to the internal walls of the pipe (1). The leading edges of the blades can be sharpened. The system is designed so that any wasp sucked out of the nest is killed by the blades of the propeller or fan. The fan rotates close to the radial struts.