Patent ID: 8166973
Filing Date: 2012-05-01
Classification: A62B,B63C

Abstract:
1. A breathing apparatus structure with a two-stage reduced-pressure spare air bottle head structure, mounted on an outlet end of a spare air bottle, comprising: an air bottle head having a bottom protruding downwards to mount a connector, the connector being threaded to an outlet of the spare air bottle, a bottom passage being axially mounted inside the connector, an inhalation mouthpiece being disposed in a manner of extending outwards from the air bottle head, a plurality of connecting holes being mounted on a top and a lateral side of the air bottle head, the plurality of connecting holes being in communication with a plurality of passages; an air-filling head, screwed to a first connecting hole on one lateral side of the air bottle head, the first connecting hole being provided with an air-filling passage at a center thereof, the air-filling passage being in communication with the bottom passage in the connector; a safety bolt, threaded to a second connecting hole on one lateral side of the air bottle head close to one side of the air-filling head, a center of the second connecting hole being provided with a safety bolt passage, which is in communication with the bottom passage in the connector, an air bottle head switch, screwed to a third connecting hole on one lateral side of the air bottle head close to one side of the air-filling head, the third connecting hole being provided with a first passage and a second passage therein and being plugged upon being pressed against by a threaded plug formed at an inner end of the air bottle head switch, the first passage being located at an eccentric position of the third connecting hole and being in communication with the bottom passage in the connector, the second passage being located at a center of the third connecting hole and being opened or closed by rotating an operating rod of a rear side of the air bottle head switch to loosen or tighten the threaded plug; a high pressure reducing valve, disposed on a fourth connecting hole of the air bottle head between the air bottle head switch and the safety bolt, the fourth connecting hole being provided with a third passage and a fourth passage therein, the third passage being located at a center of the fourth connecting hole and in communication with the second passage of the air bottle head switch, the third passage being opened or closed under the control of a piston of the high pressure reducing valve, the fourth passage being located at an eccentric position of the fourth connecting hole; and a low-pressure valve, screwed to a fifth connecting hole on a top surface of the air bottle head, the low-pressure valve being in communication with the fourth passage of the high pressure reducing valve and having a pressing rod for controlling a piston of the low-pressure valve to be opened or closed, wherein the air bottle head switch, the high pressure reducing valve and the low-pressure valve are sequentially disposed and connected in series on an air passage of the air bottle head for connecting the outlet end of the air bottle to the inhalation mouthpiece.