Bottom silo unloader

Details Bottom silo unloader Bottom silo unloader

1976-09-07

1978-03-21

Hoffman, Drayton E.

Dispensing

Snap-acting outlet element

Axially movable tube, sleeve, or apertured cap

222228, B65G 6546

Patent

active

040798488

ABSTRACT:
A silo unloader for a bottom unloading type silo having a discharge opening in the bottom wall thereof comprises a housing adapted to be mounted in said opening and including an upper wall having a shaft opening. The shaft is supported on bearings in the housing below the upper wall and the shaft extends upwardly through the shaft opening into the silo for supporting a plurality of flexible silage dislodging members which rotate with the shaft. A rotary seal between the shaft and the shaft opening in the upper housing wall comprises an inside annular collar around the shaft extending upwardly of the upper wall of the housing and an outside annular collar around the inside collar and supported by the shaft to project downwardly below the upper end of the inside collar forming an overlapping seal between the relatively rotating collars. The lap seal prevents silage, water or other materials from moving downwardly through the shaft opening in the housing wall around the shaft and thus shields the bearings in the housing resulting in longer bearing life and reduced maintenance.

REFERENCES:
patent: 2293616 (1942-08-01), Meyers
patent: 2758685 (1956-08-01), Sisson
patent: 3062555 (1962-11-01), Britton
patent: 3828947 (1974-08-01), Leply
patent: 3908411 (1975-09-01), Fahmie

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