Run-out switch arrangement for sideby-side roll-type filter

Claim 1

A FILTER ASSEMBLY COMPRISING: A PAIR OF SIDE-BY-SIDE FILTER HOUSING EACH INCLUDING A FILTER MEDIUM SUPPLY SECTION, A FLUID TREATING SECTION, A FILTER MEDIUM TAKE-UP SECTION, AND A SUPPLY OF FILTER MEDIUM SUPPORTED IN ROLL FORM UPON A MANDREL IN SAID SUPPLY SECTION; COMMON POWER OPERATED MEANS TO MOVE SAID FILTER MEDIUM SIMULTANEOUSLY FROM SAID ROLLS IN SAID SUPPLY SECTIONS IN BOTH OF SAID HOUSING THROUGH THE RESPECTIVE FLUID TREATING SECTIONS TO THEIR RESPECTIVE TAKE-UP SECTIONS, A SINGLE UNITARY COMMON "ON-OFF" CONTROL SWITCH DISPOSED BETWEEN SAID SIDE-BY-SIDE HOUSINGS AND CONNECTED TO SAID POWER OPERATED MEANS; EACH OF SAID HOUSING INCLUDING A RUN-OUT PLATE PIVOTALLY MOUNTED TO SAID HOUSING TO MOVABLY ENGAGE AGAINST SAID FILTER MEDIUM IN SAID SUPPLY SECTION; AND SWITCH ACTUATING LINKAGE FOR EACH OF SAID HOUSING, EACH OF SAID SWITCH ACTUATING LINKAGES BEING CONNECTED AT ONE END TO SAID RUN-OUT PLATE AND EXTENDING BETWEEN SAID SIDE-BY-SIDE HOUSING TO COMMUNICATE WITH SAID COMMON "ON-OFF CONTROL SWITCH TO ACTUATE SAID CONTROL SWITCH TO "OFF" POSITION WHEN SAID SUPPLY ROLL OF EITHER OF SAID HOUSINGS HAS A PRESELECTED QUANTITY OF MEDIUM REMAINING THEREON.