| 摘要 |
838,816. Moulding tubular air springs. FIRESTONE TIRE & RUBBER CO. Sept. 4, 1956 [Oct. 10, 1955], No. 26985/56. Class 87(2). [Also in Group XXXII] The bead 13, which may or may not have a twisted metal cable core, of an unvulcanized air spring blank 10a, tubular in form'and comprising two plies of rubberized fabric, is crimped by the edge of a metal end member 16 by placing the assembly, with the crimping partially performed, in a curling die, Fig. 4, comprising segments 24 supported in a stand 25 and together defining a groove 26, and pressing down a ram 27. The opposite bead of the air spring blank is similarly crimped to an end member 17. The blank with the end members crimped to it is then placed in a mould, Figs. 6 and 7, comprising a middle section 34 and end sections 31, 32. The middle section comprises two parts 34a, 34b hinged on a pin 37, and may be opened as in Fig. 7. The end sections are axially movable and as they are pressed together the blank is moulded by the middle section into the shape of bellows and steam or hot air is introduced to the interior through a conduit 33, the member 17 being perforated to allow its passage. The mould sections are also hollow for the passage of steam. The beading is then re-crimped to obviate looseness due to shrinkage. |
