Mixer impeller shaft attachment apparatus

Details Mixer impeller shaft attachment apparatus Mixer impeller shaft attachment apparatus

B - Operations, Transporting

01

F

B01F 15/00 (2006.01)

Patent

CA 2046511

MIXER IMPELLER SHAFT ATTACHMENT APPARATUS A B S T R A C T A mixer impeller, which is adapted to mix and blend liquids and liquid suspensions in industrial and commercial applications and is subject to forces which tend to work the impeller loose from attachment with its driving shaft, is secured to the shaft by collars (locking rings) which are threaded on the ends of hubs from which the blades of the impeller extend. In order to secure the attachment of the collars to the hub, a locking key is inserted between the collar and the shaft. The key has a neck which is located in a keyway also used to key the hub to the shaft, in an impeller mounting area on the shaft. The locking key has a shoulder which bears against surfaces on the collar extending away from the hub. The inner periphery of the collars are tapered outwardly away from the shaft. The neck of the locking key has portions which are deflected against these tapered inner periphers when a pin is inserted through the neck of the locking key. A ramp on the collar mates with a ramp on the key to prevent reverse rotation (working loose) of the collar. In locking position, the keys lock the collar and, therefore, the entire impeller to the shaft, since they are restrained against axial movement by the collar and against rotational movement by being keyed to the shaft and restricted by the ramp on the collar. Removal of the key for impeller replacement and maintenance is readily accomplished using the ramps on the surfaces of the collars and shoulder of the key which bear against each other. Upon removal of the locking pin, the inside of the neck deflects inwardly and the key is urged out of the collar, when the collar is unscrewed from the hub.

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