Patent GB-364010-A (GB)
Title: Apparatus for use in the manufacture of pneumatic tyres
IPC: B29C33/76
Filed: 1930-08-29
Abstract: 364,010. Assembling articles with cores ; moulding wheel tyres. MATTIA, B. DE, Passaic, New Jersey, U.S.A. Aug. 29, 1930, No. 25831. Convention date, Aug. 29, 1929. [Classes 70 and 87 (ii).] An apparatus for inserting air or water bags into tyres prior to vulcanizing distorts the bag to a curved elongated shape prior to its insertion into the tyre. This enables bags to be inserted into tyres of small bead diameter. The bag is given a width slightly less than the bead diameter of the tyre; one end of this elongated bag is then inserted into the tyre and the bag then progressively pushed into the tyre while still being maintained so that its cross-sectional diameter is less than the bead diameter. As shown in Fig. 1, the bag 2 is bent from its normal circular shape into elongate form as for example, by pushing it through an elongated slot 3 in a plate 4, Fig. 2. In a tyre shaping press, Figs. 7, 9, and 10, which includes apparatus in accordance with the invention, a tyre 12 first in the form of a pulley band 13, is shaped between platens 10, 11. The casing 14 contains an arcuate holder 18 in which the bag 2 is placed, this holder having a bell-mouthed opening in platen 10 and being defined by side walls 19, and the curved rear wall 20 and an internal curved wall 21. The side walls 19 are spaced apart at a distance considerably less than the bead diameter of the tyre, being shaped so that as the bag is drawn into the holder 18 by means of hook 25 it is given the desired curved elongate shape. The hook member 25 is actuated by piston 34, through members 33, 31, 27, 26. Pressure fluid is supplied to the cylinder 35 through pipes 40, 41 under the control of valve 42. The upper movable platen 11 which is shaped so as to guide the bag into the tyre, and has a recess 11a to receive the upper tine 45 of the hook 25, is advanced or retracted by piston 70 actuating toggle links 58, 59 and 60, 61. To aid the platens 10, 11 in shaping the tyre, air under pressure is admitted to the sealed chamber which is formed between the pulley band and the platens through pipe 75 which is controlled by valve 76 which is adapted to be opened automatically by engagement of rod 77 on crosshead 52 with an actuating member 78. In operation the pedal arm 100 is depressed and hook 25 moves down into 18 carrying with it the end of the bag. Simultaneously, push-rod 104 is moved up into the path of the crosshead which on approaching the end of its stroke pushes the rod down, reversing valve 42 and thus the movement of hook 25 which now forces the bag into the tyre. The downward movement of the crosshead is effected by depressing pedal 115 which controls valve 90, and which, after pressure is released, is returned by spring 116. The bag may be inflated through hose 118 and pipe 120 from a valve 121 controlled by an arm 122 lying in the path of an offset portion 123 of pushrod 104. In operation, an air bag is placed on platen 10 in engagement with hook 25, and hose 118 is connected thereto. Pedal 100 is depressed and hook 25 drags the air bag down into holder 18. A tyre pulley band is now placed on platen 10 and pedal 115 depressed, platen 11 thus being caused to descend and in its descent admitting air to the interior of the tyre pulley band, shaping it and pushing the air bag whilst being inflated, into the shaped tyre by a series of operations as described above. An alternative arrangement, Fig. 13 and 14, embodies a means for pushing the end of the bag into final position. In this form the hook 25a is carried by a small rocking cylinder 125 slidable within which is a piston 126 carrying a pusher plate 134 which may also carry additional segments 135, 136. This pusher action is controlled by fluid pressure through valve 129 which is actuated by arm 131 lying in the path of an extension 31a on arm 31, this pusher action thus being initiated towards the end of the upward travel of the hook 25a.