Centrifugal drainage pump with shock absorbing coupling...

Details Centrifugal drainage pump with shock absorbing coupling... Centrifugal drainage pump with shock absorbing coupling...

2006-05-29

2011-11-15

Kramer, Devon C (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S326000, C464S074000, C464S083000

Reexamination Certificate

active

08057199

ABSTRACT:
A pump assembly constructed to allow unloaded starting of the pump. The assembly includes a pump body, a permanent magnet rotor, a rotor shaft, a pump cover, a shaft sleeve and an impeller. The impeller includes a holding chamber for holding the shaft sleeve which is arranged proximate a center of the impeller. A stopping rib extends inwardly from an internal wall of the holding chamber of the impeller. The shaft sleeve includes a tubular body with a starting rib extending laterally from the body. During operation of the pump, the starting rib interferes with the stopping rib. A number of shock absorbing pads are disposed between the starting rib and the stopping rib and maintained thereat by a notch and ridge association that extends along each rib and pad. The pump includes a space that allows rotation of the starting rib relative to the stopping rib which provides unloaded starting of the pump.

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