| 摘要 |
<p>801,788. Valves. BENDIX AVIATION CORPORATION. March 6, 1956 [March 11, 1955], No. 7047/56. Class 135. A bellows 18, which has its ends soldered to an end cover 11 of an oxygen regulator body 10 and a slidable plate 19 in the latter, encloses a stop cylinder 45 and a spring 22 abutting the plate 19; a stem 25 fixed to the plate 19 and passing through the cover 11 embodies locking and setting flanges 26, 28 and, for setting purposes, is in two parts joined by a screw 29. Locking means in the form of a fork 32 hold the stem 25 and plate 19 in the inoperative position by straddling the stem 25, the outer ends of the fork 32 being lobe-shaped to facilitate insertion between the cover 11 and flange 26; in the locked position a stop 36 on the fork engages the edge of the flange 26. A locking pin extends through the fork arms and the stem. The fork is withdrawn from the locking position by a flexible metal cable 38. In operation, the locking pin is withdrawn and if necessary the fork 32 is shifted round the stem 25 to the most convenient position whereupon the cable 38 is then either pulled manually from any angle, or if attached to an aircraft is actuated upon operation of a pilot ejector seat, to withdraw the fork 32; the spring 22 then moves the plate 19 to open a conventional oxygen regulator valve 44, via a pin 43, the bellows 18 merely serving as a seal between a pressure chamber 40, intermediate the valve 44 and plate 19, and atmosphere. If the valve is a pressure regulator the oxygen released upon opening the valve 44 fills the chamber 40 and the interior of the body 10 and when the pressure rises to a given value the bellows 18 contract and release pin 43 allowing the valve 44 to close, the bellows being open to atmosphere by the clearance between the stem 25 and cover 11. The apparatus is returned to the inoperative position upon retracting the stem 25 by inserting a lever to engage the flange 28 and then replacing the fork. Retraction of the stem may also be effected by loosening screw 29, inserting the fork and then tightening the screw. The bellows may be omitted or replaced by some other pressure responsive element.</p> |
