Multiple area rear launch tube cover

Claim 2

Apparatus for normally closing one end of a launch tube for exhaust-propelled vehicles and for opening the end of the launch tube in response to the exhaust plume of the vehicle, said apparatus comprising: a launch tube; a duct disposed adjacent said launch tube for conducting away the exhaust of the vehicle; and a cover for normally blocking connection between said launch tube and said duct, said cover having at least one frangible central section capable of breaking in response to the pressure of the exhaust plume of the vehicle, thereby to establish connection between said launch tube and said duct.

Claim 3

Apparatus as defined in claim 1 wherein said cover includes a plurality of sections surrounding said central section, and further including means for causing breakage of said central and said surrounding sections successively in response to the exhaust plume increasing in diameter, thereby to create an exit for the exhaust gases sufficient to provide uninhibited access of the gases to said duct.

Claim 4

Apparatus as defined in claim 2 wherein said central section is substantially circular and said surrounding sections are substantially annular and concentric with said central sections.

Claim 5

Apparatus as defined in claim 3 wherein corner sections are provided surrounding the outermost surrounding section to provide a substantially rectilinear outline, and wherein grooves are provided to define said corner sections and to cause them to break away in response to a further increase in diameter of the exhaust plume.

Claim 6

Apparatus as defined in claim 2 wherein said cover consists of a single piece of heat-resistant material having grooves between said sections of a depth sufficient to cause said sections to break away successively in response to the increase in diameter of the exhaust plume.

Claim 7

Apparatus as defined in claim 5 wherein the groove surrounding said central section is deeper than the grooves between said surrounding sections.

Claim 8

Apparatus as defined in claim 5 wherein the groove surrounding said central section is the deepest groove, while the grooves between successive surrounding sections adjacent to said central section and the outer sections are of increasingly smaller depth so that said central section will first break off while successive surrounding sections will break off one after the other.

Claim 9

Apparatus for normally closing one end of a launch tube for exhaust propelled vehicles and for opening the end of the launch tube in response to the exhaust plume of the vehicle, said apparatus comprising: a launch tube; a plenum chamber disposed adjacent said launch tube for conducting away the exhaust of the vehicle; a cover for normally closing the connection between said launch tube and said plenum chamber, said cover being of rectilinear shape and having a substantially circular central section and a plurality of substantially annular surrounding sections, and corner sections between the outer edge of said cover and the outermost annular section; and a plurality of grooves between said central section, said annular surrounding sections and said corner sections, said grooves having a depth which is increasingly smaller from said central section outward between said annular surrounding sections and said corner sections, whereby said sections are capable of breaking successively in response to an expanding pressure of the exhaust plume of the vehicle.

Claim 10

Apparatus for normally closing one end of a launch tube for exhaust propelled vehicles and for opening the end of the launch tube in response to the exhaust plume of the vehicle, said apparatus comprising: a launch tube; a plenum chamber disposed adjacent said launch tube for conducting away the exhaust of the vehicle; a cover for normally closing the connection between said launch tube and said plenum chamber, said cover being of rectilinear shape and having a substantially circular central section and a plurality of substantially annular surrounding sections, and corner sections between the outer edge of said cover and the outermost annular section; and a plurality of grooves between said central section, said annular surrounding sections and said corner sections, said grooves having a depth which is increasingly smaller from said central section outward between said annular surrounding sections and said corner sections, whereby said sections are capable of breaking successively in response to an expanding pressure of the exhaust plume of the vehicle.