| 摘要 |
973,696. Rocket motor casings. MINNESOTA MINING & MANUFACTURING CO. Nov. 18, 1960 [Nov. 20, 1959], No. 39751/60. Heading F3A. A pressure vessel, Fig. 3, comprises segmental strips 13a, 13b, 13c retained in edge to edge abutment to form shell 13, the strips at least at one end curving inwardly to form an end wall 6b and being formed substantially entirely of resin bonded filaments extending longitudinally from one end of the shell to the other. In the embodiment of Fig. 1, a rocket motor casing 5 comprises a shell 13, an inner shell 12 of circumferentially oriented resinbonded filaments, and an outer shell 14 also of circumferentially oriented filaments. An extension of shell 13 forms boss 7 and an annular flange 15, the thickness of the shell increasing as the filaments converge to form orifice 8. A liner 19, which may be of nylon fabric impregnated with a flexible epoxy resin, is bonded to the inner surface of wall 6, a collar of circumferentially oriented filaments is formed around boss 7 and a moulded ring 18 abuts an inturned flange 17, which flange is a further extension of shell 13. A cover-plate 9 with exhaust tubes 10 is secured to the casing 5 by bolts 11. To manufacture the casing, fibre glass, for example, impregnated with an uncured resin, is wound on a suitable mandrel. The resin is cured to form shell 12, to which is added the liner 19 and ring 18, these components then being overlaid by the segmental portions of shell 13, a low temperature liquid amine curing epoxy being used as curing agent. Finally, shell 14 is wound on, its thickness increasing towards the cover-plate 9, and also collar 16, both being cured to form an integrated casing. The winding of shell 14 may be continued to merge with collar 16 and shell 12 may be continued inside wall 6, lining 19. being dispensed with. A second embodiment comprises a symmetrical casing having a boss 7 and orifice 8 at each end. Also more than one shell 13 may be used, each being sandwiched between shells of circumferentially oriented filaments.
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