GB252415A - Improvements in and relating to apparatus for moulding and vulcanising pneumatic tyre covers and the like - Google Patents

Abstract

252,415. Dunlop Rubber Co., Ltd., Macbeth, C., and Mitton, J. Jan. 15, 1925. Moulding wheel tyres; mould opening-devices.-Relates to tyre moulding and vulcanizing apparatus of the type comprising a pair of horizontal steam chests embracing a divisible mould, one chest being hinged to the other, and consists in the provision of means to ensure automatically the separation of the tyre from the mould upon opening the apparatus. As shown, a lower chest 1 rigid with a base 3 is connected by a hinge 4 to a movable upper part 2 balanced by an adjustable weight 23, the chests being formed with cavities 5 each embracing one-half of a divided mould 6. In the closed position a spring latch 12 on the chest 2 engages a catch 14 on the chest 1 and the parts are clamped together by swivel bolts 7. The tyre cover is carried by a clip ring 25 having a projecting inner portion 26 adapted to seat on a flange 27 on a carrier ring 28 which normally rests upon the lower chest but is raised, as the upper chest 2 is opened, through levers 43, 39 and links 41, 29. The ring 28 slides on fixed posts 30<a> against which abut horizontal bolts projecting through the ring 28 above the clip ring, the bolts being drawn inwardly by springs 35. The ring 28 rises more slowly than the chest 2 and, at first, the horizontal bolts overlie the clip ring, causing detachment of the tyre from the upper mould shell. At the completion nf the upward movement the bolts withdraw inwardly over inclines 31, 32, leaving the tyre free for removal. To start the opening of the mould, the upper chest is forced away from the lower by a pointed, inclined screw 16 which also disengages the catch 12. The screw is operated by a nut 21 turned through gearing 17 - - 20. The tyre is supported by the usual air-bag 49 having an inlet valve 50 connected by flexible piping 51 to the air supply. To ensure correct alignment with the valve 50 the tube is provided with an extension 52a sliding through a pin trunnioned in bearings carried by a plate 53 spanning the ring 28 and connected to the valve 50 by a connection 56. According to the Provisional Specification, the screw for separating the chests is carried by the upper one; also the chests may be separated by lifting-tackle or prized apart by a crowbar.