| 摘要 |
<p>A drive assembly, particularly for driving arms (15,16,17) around a compartment in a waste material digester, comprises a rotatable hub (21) having an inner drive plate (24) and a ratchet plate (23) secured thereto for rotation therewith. Positionally opposed, parallel piston and cylinder drive means (36,37) recipocatably drive an outer drive plate (35), drive arms (38,39) pivotally carried on the outer drive plate (35) engaging with drive pins (32) on the inner drive plate (24) to drive the hub in one direction. Movement of the hub in the opposite direction is prevented by latches (48,49) engaging with respective shoulders (29) of the ratchet plate (23) when the outer drive plate moves in said opposite direction. <IMAGE></p> |
