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A shut-off system for an orifice of a duct, particularly for an orifice of an air inlet passage that allows air into the combustion chamber of a ramjet, includes a shutter for shutting off the orifice of the duct, and a controllable actuating device capable of acting on the shutter to uncover the or

A shut-off system for an orifice of a duct, particularly for an orifice of an air inlet passage that allows air into the combustion chamber of a ramjet, includes a shutter for shutting off the orifice of the duct, and a controllable actuating device capable of acting on the shutter to uncover the orifice. The shutter includes a removable cap which is held on the duct and a locking device which keeps the cap on the duct by at least one locked jaw, which is unlockable. The actuating device includes at least one controllable striker which is capable of unlocking the jaw in such a way as to cause the cap to be ejected from the duct and to uncover the orifice.

대표청구항 ▼

A shut-off system for an orifice of a duct, particularly for an orifice of an air inlet passage that allows air into the combustion chamber of a ramjet, includes a shutter for shutting off the orifice of the duct, and a controllable actuating device capable of acting on the shutter to uncover the or

A shut-off system for an orifice of a duct, particularly for an orifice of an air inlet passage that allows air into the combustion chamber of a ramjet, includes a shutter for shutting off the orifice of the duct, and a controllable actuating device capable of acting on the shutter to uncover the orifice. The shutter includes a removable cap which is held on the duct and a locking device which keeps the cap on the duct by at least one locked jaw, which is unlockable. The actuating device includes at least one controllable striker which is capable of unlocking the jaw in such a way as to cause the cap to be ejected from the duct and to uncover the orifice. 45431, 19820800, Suzuki et al., 060/286; US-4649703, 19870300, Dettling et al., 060/275; US-4693078, 19870900, Dettling et al., 060/295; US-4706454, 19871100, Smith, Jr., 060/274; US-5367889, 19941100, Lanyon, 060/297; US-6584768, 20030700, Hecker et al., 060/297 cond foldable tabs are less than the lengths of the third and fourth foldable tabs.11. The ridge cover according to claim 1 wherein the roofing material comprises asphalt composition material.12. The ridge cover according to claim 1 wherein the roofing material comprises fiberglass material.13. The ridge cover according to claim 1 wherein the roofing material comprises rubberized material.14. The ridge cover according to claim 1 further comprising a first central tab integrally formed with the second end and having a width slightly less than the width of the first central portion and a second central tab integrally formed with the fourth end and having a width slightly less than the width of the second central portion.15. The ridge cover according to claim 14 wherein the first and second central tabs are each provided with a pair of notches for indicating the required extent of overlap of one ridge cover by the adjacent ridge cover when installed on a ridge.16. The ridge cover according to claim 14 wherein the first central tab is longer than the second central tab.17. The ridge cover according to claim 1 wherein the first sheet of roofing material is substantially the same size as the second sheet of roofing material.