Patent ID: 6200098
Filing Date: 2001-03-13
Classification: F04D

Abstract:
A fan assembly comprising;a hub (12) adapted for driving connection to a rotary drive, anda plurality of fan blades (14) extending radially from the hub (12),said fan blades (14) consisting of a first composition and said hub (12) consisting of a second composition different from said first composition,said assembly characterized by a driving connection between said blades (14) and said hub (12) for rotating said blades (14) in unison with said hub (12) up to a predetermined rotational speed and for allowing rotation of said hub (12) independently of and at a higher speed than said fan blades (14) in response to said hub (12) rotating at a higher rotational speed than said predetermined rotational speed to prevent said fan blades (14) from bursting in response to centrifugal force.