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Mixer impeller shaft attachment apparatus

  • US 5,152,606 A
  • Filed: 07/27/1990
  • Issued: 10/06/1992
  • Est. Priority Date: 07/27/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for mounting on the shaft having an axis of rotation, an impeller having a hub, said shaft having a mounting area, said area having a keyway which extends axially of said shaft and a turnable collar having an inner periphery and being removably attachable to said hub around said shaft, said apparatus comprising a tapered portion on the inner periphery of said collar which tapers outwardly from said shaft when said collar is attached to said shaft, a key having a shoulder and a neck with inner and outer sides, said outer side being deflectable away from said inner side, said key being disposed in locking position between said mounting area and the inner periphery of said collar with said shoulder bearing upon said collar and with said inner side of said keyway when said collar is attached to said hub, a pin having a surface defining its width, said pin being movable into said key into locking position in said neck between said inner and outer sides, said inner and outer sides each having a portion, said portions of said inner and outer sides facing each other, said portions of said inner and outer sides also being normally spaced from each other by a distance less than the width of said pin, said outer side being engaged by said surface of said pin and being deflected against said inner periphery of said collar and said tapered portion thereof when said pin is in locking position, said collar having a surface against which said shoulder of said key bears, said surface of said collar defining a ramp extending circumferentially along said surface of said collar, said shoulder of said key having a surface which bears upon said ramp when said key is in the locking position, said ramp of said collar and said surface of said shoulder having complementary inclinations which are disposed in mating relationship when said key is in said locking position, and said ramp on said collar applying force against said shoulder of said key to move said key out of said locking position when said collar is turned to release said collar from said shaft.

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