lawler

Claim 1

IN A FAN HAVING A FRAME TO WHICH IS JOURNALED A SHAFT CARRYING A FAN ASSEMBLY AT ONE OF ITS ENDS AND A DRIVEN DISC AT ITS OTHER END, AND A MOTOR MOUNTED ON THE FRAME, A DRIVE CONNECTION BETWEEN SAID MOTOR AND THE DISC, AND A MEANS FOR INTEGRALLY CONNECTING THE DISC TO THE SHAFT WHICH COMPRISES A HUB WITH A NON-CIRCULAR CROSS SECTION CARRIED ON THE SHAFT, SAID DISC PROVIDED WITH A NON-CIRCULAR OPENING CENTRALLY LOCATED, AND ADAPTED WHEN IN ONE ROTARY POSITION RELATIVE TO SAID HUB TO RECEIVE INSERTION OF SAID HUB TO INTERMEDIATE ITS ENDS AND WHEN IN ANOTHER ROTARY POSITION RELATIVE TO SAID HUB TO INTERFERE WITH SAID HUB SO AS TO PREVENT MOVEMENT OF SAID HUB THERETHROUGH, SAID HUB PROVIDED WITH A RECESS ABOUT ITS SIDE EXTERIOR SURFACE IN A PLANE AT RIGHT ANGLES TO THE AXIS OF ROTATION OF SAID SHAFT, THE RECESS HAVING DIMENSIONS THAT PERMIT THE HUB TO BE ROTATED RELATIVE TO THE DISC WHEN THE DISC IS IN REGISTER WITH SAID RECESS TO PLACE SAID DISC IN SAID OTHER ROTARY POSITION RELATIVE TO THE HUB AND WITHIN THE RECESS, THE PORTIONS OF THE HUB IN WHICH THE DISC RESIDES UPON SUCH ROTATION TO SAID OTHER POSITION, PRESENTING CLOSELY ADJACENT CONFRONTING SURFACES TO THE DISC ABOUT SUCH OPENING SO THAT THE DISC IS HELD AGAINST LONGITUDINAL MOVEMENT RELATIVE TO THE HUB AND THE HUB HAVING A PORTION DISPLACED LONGITUDINALLY INTO SAID RECESS AND INTO THE OPENING IN SAID DISC AT A POSITION FURTHER FROM THE HUB AXIS THAN THE EDGE PORTION OF THE DISC OPENING IMMEDIATELY ADJACENT THERETO TO LOCK THE DISC AGAINST ROTATION RELATIVE TO THE HUB AND INTO AN INTEGRAL CONNECTION WITH SAID HUB IN ITS SAID OTHER POSITION.