Abstract: Invalid's chair has a support frame which includes a main support section, a seat support section pivotable on the main frame section and a back frame section, pivotable on the seat support section of the frame. The chair includes a seat cushion mounted on the seat frame and lower and upper back support cushions carried by the back frame and being independently adjustable relative one another. The seat and back frame sections are tiltable on the main frame together and the back frame is also tiltable independently of the seat frame. A tilting control cylinder is disposed between the back support section of the frame and the seat section and another tilt control cylinder is disposed between the seat section and the main support section to enable tilting of the back and seat portions of the chair together and independent tilting the back portion. The back support frame section and seat frame section are each pivotable about pins which are disposed substantially forward of the back edge of the seat cushion.

Abstract: A pressure loss indicator employs a diaphragm which assumes one of two stable convex configured states in accordance with the pressure differential across the diaphragm. A trigger is responsive to the state of the diaphragm to release an indicator pin from the assembly upon occurrence of a reduction in the ambient pressure which results in a pressure differential across the diaphragm. A reference pressure is established in a reference chamber at one side of the diaphragm, the reference chamber being selectively isolated from the ambient pressure by a check valve.