GB190807A - Improvements in apparatus for controlling the delivery or discharge of high pressure air or gases - Google Patents

Abstract

190,807. Adams, F. H. Sept. 29, 1921. Inhalers. - In apparatus for administering anaesthetics the delivery of high-pressure air or gas from a container or other source is controlled by apparatus of the kind having a load-controlled valve which cuts the supply off when the pressure of the discharged gas rises unduly, the gas passing through. this valve passing to the outlet through an intermediate regulating chamber having outlets controlled by a second valve operated by the mechanism which operates the first valve. The valve is controlled by a diaphragm, and the gas passes to an expansible bag the inlet to which is automatically cut off on rise of pressure. In the apparatus shown, an intermediate receiver 10, Fig. 1, communicates through a valve-controlled tube 2 and a union tube 100 with a storage cylinder (not shown) of compressed gas, and communicates also through a pipe 30 controlled by a hand valve 55 with a bag 32, Fig. 4, connected with the pipe by a coupling 95. A valved pipe 86 leading from the receiver 10, and a valved pipe 88 leading to the pipe 30 communicate with a device for mixing the gas with chloroform or ether. The union 100 is formed with conical ends and with its nuts 17, 18 is reversible. The tube 2 is formed with inlet ports 66 controlled by a spring-pressed hollow valve 65 containing a reversible block 3 controlling the port 101 of the union 100. The valve is automatically closed by rise of pressure in the receiver 10 through a lazy-tongs pivoted at one end to a rod 7 secured to a diaphragm 19 covering the receiver and at the other end pivotally connected to a nut 6 screwed on the tube 2. The pressure at which the valve is closed is determined by springs 15, 16 surrounding the rod and abutting against a transverse member 71 of a gland 12 through which it passes. The valves may be positively actuated by Bowden wire mechanism in which the cable 75 is secured to the top of the rod 7 while the flexible tube is secured to a pillar 20, motion being communicated by a lever or a spring-controlled bolt having a pin entering one of a series of notches. The gas bag, Fig. 4, is enclosed within levers 33, 34 connected to a forked member 38 operating an inlet plug valve 44 through a link 42 in opposition to the action of levers 36 pressed by adjustable springs 39. The gas enters the bag through a stopped perforated silencing pipe, and passes out by a second pipe and a passage in' the valve casing to a mouthpiece connection. A spring-controlled piston or collapsible bellows. may replace the diaphragm, and the rotary plug valve of the gas bag may be replaced by a, valve of another kind.