Fluid flow apparatus

Claim 1

AN OXYGEN FLOW RESPONSIVE APPARATUS FOR INDICATING AN OXYGEN FLOW CONDITION COMPRISING (A) A HOUSING DEFINING AN OXYGEN INLET AND AN OPENING DISPOSED AT THE FRONT OF SAID HOUSING, (B) PRESSURE RESPONSIVE MEANS MOVABLY MOUNTED IN SAID HOUSING HAVING ONE SIDE THEREOF EXPOSED TO AND ACTUATED BY THE FLOW OF OXYGEN THROUGH SAID INLET, (C) A FRAME MEMBER HAVING AN APERTURE THERETHROUGH AND INTERPOSED BETWEEN SAID PRESSURE RESPONSIVE MEANS AND SAID OPENING, (D) A SHAFT, (E) A PAIR OF SUPPORTS EXTENDING FROM SAID FRAME MEMBER HAVING MEANS FOR SUPPORTING SAID SHAFT, (F) AN INDICATING MEMBER IN THE FORM OF A SINGLE STRUCTURE MOUNTED FOR ROCKING MOTION ON SAID SHAFT, SAID INDICATING MEMBER EXTENDING THROUGH SAID APERTURE HAVING ONE END OF TWO SECTIONS OF CONTRASTING COLORS AND VIEWABLE THROUGH SAID OPENING AND A SECOND END ARRANGED TO BE ACTUATED BY THE MOVEMENT OF SAID PRESSURE RESPONSIVE MEANS, (G) A STOP EXTENDING FROM SAID FRAME MEMBER, (H) TORSION SPRING MEANS DISPOSED AROUND SAID SHAFT HAVING A PORTION THEREOF RESTING AGAINST SAID INDICATING MEMBER FOR BIASING SAID INDICATING MEMBER AGAINST SAID STOP, THEREBY EXPOSING ONE OF SAID SECTIONS OF CONTRASTING COLOR TO VIEW THROUGH SAID OPENING.