Dust separators

Claim 1

A DUST SEPARATOR APPARATUS CONDITIONABLE SELECTIVELY FOR SEPARATING DUST FROM GAS FLOWING THROUGH SAID APPARATUS AND FOR ENABLING FLOW OF GAS THROUGH SAID APPARATUS WITH LESS DUST SEPARATION BUT WITH MINIMUM LOSS OF PRESSURE, SAID APPARATUS COMPRISING A CASING HAVING AN INLET FOR FLOW OF GAS INTO SAID CASING IN ONE DIRECTION AND AN OUTLET FOR FLOW OF GAS FROM SAID CASING IN ANOTHER DIRECTION TRANSVERSE TO SAID ONE DIRECTION; A PLURALITY OF FIRST VANES SPACED FROM ONE ANOTHER ACROSS THE PATH OF GAS FLOWING FROM SAID CASING THROUGH SAID OUTLET AND BEING GENERALLY PARALLEL TO SAID PATH; A PLURALITY OF SECOND VANES SPACED FROM ONE ANOTHER ACROSS SAID PATH UPSTREAM OF SAID FIRST VANES AND BEING ADJUSTABLE TO A FIRST POSITION WHEREIN SAID SECOND VANES WILL CAUSE AN ABRUPT CHANGE OF DIRECTION OF FLOW OF GAS FROM SAID CASING TO SAID FIRST VANES AND SAID OUTLET, THEREBY CONDITIONING SAID APPARATUS FOR SEPARATING DUST FROM THE GAS, AND TO A SECOND POSITION WHEREIN SAID SECOND VANES WILL GUIDE THE GAS BETWEEN SAID FIRST VANES WITH A LESS ABRUPT CHANGE OF DIRECTION, THEREBY CONDITIONING SAID APPARATUS FOR ENABLING FLOW OF GAS THERETHROUGH WITH A MINIMUM LOSS OF PRESSURE; AND A PLATE WITHIN SAID CASING INCLINED FROM ONE OF ITS EDGES ADJACENT TO SAID INLET AND RELATIVELY FAR FROM SAID VANES TO ITS OPPOSITE EDGE RELATIVELY FAR FROM SAID INLET AND RELATIVELY CLOSE TO SAID VANES.