Sight-glass indicator or the like

Claim 1

FLUID FLOW INDICATOR COMPRISING A HOUSING BODY HAVING A BORE EXTENDING THERETHROUGH AND OPENING AT OPPOSITE ENDS THROUGH OPPOSITE SIDES OF THE BODY AND FORMING A FLUID CHAMBER, SAID BORE AT ONE OPEN END BEING BORDERED BY AN ANNULAR INWARDLY PROJECTING FLANGE, THE SAID FLANGE FORMING AN INWARDLY FACING SHOULDER AND DEFINING A WINDOW OPENING OF MATERIALLY SMALLER DIAMETER THAN THE BORE, SAID BORE AT ITS OTHER END HAVING A COUNTER-BORE FORMING AN ANNULAR COUNTER-BORE RECESS PROVIDING A SHOULDER FACING OUTWARDLY AWAY FROM SAID INWARDLY FACING SHOULDER, AXIALLY ALIGNED FLUID INLET AND OUTLET PORTS IN SAID HOUSING BODY DIRECTED TRANSVERSELY OF AND OPENING INTO SAID CHAMBER, A TRANSPARENT DISC BODY IN AND PARTITIONING THE CHAMBER FORMING BORE AT SAID ONE OPEN END, A GASKET BETWEEN SAID INWARDLY FACING SHOULDER AND SAID TRANSPARENT DISC AND FORMING A SEAL THEREBETWEEN, A RING GASKET IN SAID COUNTER-BORE RECESS, A TRANSPARENT FRUSTO-CONICAL DISC EXTENDING INTO SAID OTHER END OF SAID BORE THROUGH SAID RING GASKET WITH THE APICAL END THEREOF DIRECTED INTO THE CHAMBER AND HAVING THE TAPERED SIDE THEREOF ENGAGING AND COMPRESSING SAID RING GASKET LATERALLY IN SAID RECESS, A FLOW INDICATING VANE WITHIN SAID CHAMBER BETWEEN SAID DISCS AND COMPRISING AN ELONGATE HUB DISPOSED IN THE AXIAL CENTER OF THE SAID BORE AND CARRYING LONGITUDINALLY EXTENDING RADIALLY PROJECTING BLADES, MEANS POSITIONING THE ENDS OF SAID HUB ADJACENT TO AND IN OPPOSED RELATION WITH THE CENTERS OF SAID DISCS FOR FREE ROTATION OF SAID VANE BETWEEN SAID DISCS, MEANS SECURED TO THE HOUSING BODY AND ENGAGING AND PRESSING SAID TRANSPARENT FRUSTO-CONICAL DISC INWARDLY AND SECURING THE CHAMBER CONTAINING PARTS IN OPERATIVE POSITIONIN THE CHAMBER AND ALSO EFFECTING COMPRESSION OF SAID GASKETS AGAINST SAID SHOULDERS, AND MEANS IN SAID INLET PORT FOR DEFLECTING IN-FLOWING FLUID TOWARD AND AGAINST THE VANE BLADES ON ONE SIDE OF SAID HUB.