Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Paddle wheel 1 consists of a hub 2 carrying four paddles 3. Paddles 3 are embedded in hub 2 which is indented 4 at the exit point on either side of paddles 3. Indentation 4 follows the natural bending line of the flexible paddles. As a result, the paddle wheel may be used in both rotational directions. For centering and fixing the paddles in the hub, the latter is subdivided into an even number of segments 5. A continuous strip, forming two paddles and held in place by winding forces, is wound around every other segment 5. The winding forces may be increased by indenting the strip in the hub region.