초록 ▼

A reliable and economical apparatus for relieving pressure in a large aircraft cabin oxygen supply, where multiple oxygen cylinders are used concurrently. A series-parallel array of valves actuated by changes in differential pressure between the oxygen supply and the ambient cabin atmosphere provide

A reliable and economical apparatus for relieving pressure in a large aircraft cabin oxygen supply, where multiple oxygen cylinders are used concurrently. A series-parallel array of valves actuated by changes in differential pressure between the oxygen supply and the ambient cabin atmosphere provides overpressure relief The series connection of the valves reduces the risk of open-valve failures, while the parallel connection of sets of series-connected valves reduces the risk of closed-valve failures. The small number of valves used in its design reduces the cost of the apparatus. The series-parallel structure is optionally extended to larger numbers of valves to facilitate the use of less-expensive valves and supporting components without loss of reliability.

대표청구항 ▼

A reliable and economical apparatus for relieving pressure in a large aircraft cabin oxygen supply, where multiple oxygen cylinders are used concurrently. A series-parallel array of valves actuated by changes in differential pressure between the oxygen supply and the ambient cabin atmosphere provide

A reliable and economical apparatus for relieving pressure in a large aircraft cabin oxygen supply, where multiple oxygen cylinders are used concurrently. A series-parallel array of valves actuated by changes in differential pressure between the oxygen supply and the ambient cabin atmosphere provides overpressure relief The series connection of the valves reduces the risk of open-valve failures, while the parallel connection of sets of series-connected valves reduces the risk of closed-valve failures. The small number of valves used in its design reduces the cost of the apparatus. The series-parallel structure is optionally extended to larger numbers of valves to facilitate the use of less-expensive valves and supporting components without loss of reliability. having four legs; said frame being entered from said rear; b) a rear wheel, rotatably attached to the bottom at the rear rear of said walker frame; c) a leading wheel, rotatably attached to the bottom at the front front of said walker frame; said leading wheel having a lead low point; and d) an intermediate wheel rotatably attached to the bottom of said walker frame intermediate said rear and leading wheels and close to said leading wheel; said intermediate wheel having an intermediate low point; said intermediate low point being lower than said lead low point. 4. A rolling walker as claimed in claim 3 in which said intermediate wheel is larger in diameter than said leading wheel. 5. A method of fabricating a rolling walker comprising: a) fabricating a walker frame having four legs, said frame having a front, a rear and a bottom and being entered from said rear; b) providing a rear wheel; c) rotatably attaching said a rear wheel to the bottom rear of said walker frame; d) providing a leading wheel having a lead low point; e) rotatably attaching said leading wheel to the bottom front of said walker frame; f) providing an intermediate wheel, having an intermediate low point; and g) rotatably attaching said intermediate wheel, to the bottom of said walker frame intermediate said rear and leading wheels and close to said leading wheel so that said intermediate low point is lower than said lead low point. 6. A method of fabricating a rolling walker as claimed in claim 5 in which said intermediate wheel is larger in diameter than said leading wheel. ponding one of said telescopic legs; a trust pair of link members mounted to a pair of said top corner joints and to a corresponding pair of said leg slider joints mounted on each adjacent pair of said telescopic legs for providing a scissors connector and a plurality of canopy support arms each including a flexible hinge connector and each fixably connected to an corresponding one of said top corner joints and to a corresponding one of said leg slider joints for rasing a lowering said collapsible frame a stable and unitary structure. 19. The collapsible frame of claim 18 wherein said flexible hinge connector further includes a sliding sleeve.