Patent GB-1306416-A (GB)
Title: Tyre building drum
IPC: B29D30/36
Filed: 1970-06-02
Abstract: 1306416 Tyre building machines NATIONAL-STANDARD CO 2 June 1970 [3 June 1969] 26496/70 Heading B7C  In a method of tyre building, an intermediate portion of a drum-supported cylinder of tyre carcass material is radially displaced to form a torus configuration which has a substantially cylindrical crown portion. Substantially radially inwardly extending sidewall portions and curved end connecting portions are formed between the crown portion and the sidewall portions. A tyre building drum for use in the method has end assemblies 16 and an intermediate assembly 15, which assembly 15 has a hub member 17 with a plurality of radially extending bores 25 lying alternately at opposite sides of a radial centre line 26 of the hub 17. Each of the bores 25 receives a telescopic assembly 27, one assembly 27 for each of a plurality of circumferentially arranged sections 30 of the assembly 15. Each section 30 comprises a body portion 32 which has a plurality of axially spaced first supporting blade-like members 33, the members 33 of circumferentially adjacent intermediate sections being interleaved so as to be movable radially and circumferentially with respect to one another by way of telescopic members 34, 35 and thus provide substantially cylindrical supporting surfaces of different predetermined radii in co-operation with blade means 38, comprising a plurality of first and second blade-like components 39, 40, while there are a plurality of blade-like second supporting members 37 one adjacent each of the axially outermost of the members 33, the members 37 of circumferentially adjacent intermediate sections being interleaved so as to be movable radially and circumferentially relative to one another. The members 37 have outer edges which define curved end surfaces extending radially inwardly of the substantially cylindrical surface formed by members 33 in their radially outermost positions. A hollow shaft 24 is rotatably mounted at its opposite ends by drive shaft means 42 whose opposite end portions are oppositely screw-threaded for receiving end head components 43 which are reciprocated axially towards and away from each other upon rotation of means 42. Guide block assemblies 44, and hence the end head components 43 are pivoted at 47 to one end of each of a pair of links 46, each link 46 being pivoted at its opposite end at 48 to a gear segment 50. The members 33, 37, 39, 40 are moved radially outwardly by co-operation with the gear segments 50 whose teeth engage laterallyspaced-apart rows of slots 51 formed in each of the blade members 39 of blade means 38 and the members 37 form rounded shoulders in the carcass material between the crown portion and side wall portions of the latter. A plurality of bead setting blocks 88 which have bead-defining recesses 89 each pivotally attached to a yoke 90 by a link 92 pivoted to the yoke 90 at 93 and to each block 88 at 94. The links 92 allow each bead set block 88 to expand or move with segment members 74. An elongated slot in a yoke block (72), Fig. 1b (not shown), allows the members 74 to move until restrained by beads 100.