Damper blades and means for pivoting same

Claim 1

A DAMPER OR THE LIKE COMPRISING A BLADE; POSITIONING MEANS ON SAID BLADE EXTENDING LONGITUDINALLY AND GENERALLY CENTRALLY THEREOF; AN AXLE HAVING A CYLINDRICAL BEARING PORTION, A SLOTTED PORTION OF UNIFORM CROSS SECTION THROUGHOUT ITS LENGTH, AND A SHOULDER THEREBETWEEN, SAID SLOTTED PORTION HAVING A SLOT ENGAGING AN END OF SAID BLADE, THE ENTIRE LENGTH OF THE EDGES OF THE SLOT EXTENDING LONGITUDINALLY OF SAID SLOTTED PORTION AND BEING CONTIGUOUS WITH AND PARALLEL TO SAID POSITIONING MEANS OVER SUBSTANTIALLY THE ENTIRE LENGTH OF SAID SLOTTED PORTION, SAID POSITIONING MEANS BEING EFFECTIVE TO PREVENT LATERAL MOVEMENT OF SAID SLOTTED PORTION OF SAID AXLE ON SAID BLADE AND TO MAINTAIN SAID SLOTTED PORTION IN A FIXED POSITION PARALLEL TO THE LONGITUDINAL EXTENT OF SAID BLADE AND IN A CENTRAL PORTION THEREOF, SAID BEARING PORTION OF SAID AXLE EXTENDING BEYOND THE END OF SAID BLADE, AND SAID SHOULDER OF SAID AXLE EXTENDING LATERALLY OUTWARDLY BEYOND SAID BEARING PORTION; A SIDE FRAME MEMBER; A BEARING IN SAID SIDE FRAME MEMBER TO RECEIVE SAID BEARING PORTION OF SAID AXLE; AND A FLANGE ON AN INNER END OF SAID BEARING AND COOPERATING WITH SAID SHOULDER FOR SPACING THE END OF SAID BLADE FROM SAID SIDE FRAME MEMBER.