Patent GB-735160-A (GB)
Title: Vulcanising press for pneumatic tyres
IPC: B29D30/06
Filed: 1953-09-01
Abstract: 735,160. Tyre presses. GUHR, K., and HERBERT, A., [trading as MASCHINENFABRIK L. HERBERT]. Sept. 1, 1953 [Sept. 1, 1952], No. 24215/53. Class 87 (2). In a vulcanizing press for pneumatic vehicle wheel tyres, having a top mould part pivoted on two arms guided on a bottom mould part with each of the arms movable by a pair of toggle levers of which the hinge pin is operatively connected to a drive element, the arms are each provided, on a surface associated with a guide roller, with twc adjacent cam tracks and the guide roller is arranged to be ad justed selectively for engagement with one of the cam tracks The lifting arms 4 which carry the top mould part 3 are pivoted on a shaft 9 which moves in slots 10 in the base 2. The shaft. 9 is moved to raise or lower the arms 4 by the bending or straightening of a toggle comprising levers 6, 7 the outer end of the lever 6 being pivoted on a shaft 8 fixed to the base and the outer end of the lever 7 being pivoted to the shaft 9, while the pins 15 which join the toggle levers'are acted on to bend or straighten the toggle by a forked head 14 into which is screwed a spindle 13 operated through gearing 11 by a motor 12. The lifting arms 4 have guide tracks 30, 38, either being engaged by rollers 16 according to the position of the rollers. Before opening the mould the rollers 16, which are mounted on bearing plates 23, are moved into the tracks 38 by a lever 18, Fig. 3, pivoted at 20 to a lug on the bottom mould part, which moves one bearing plate 23 directly and moves that on the other side through a rod 22. The movement of the lever 18 uncovers a push button 27 by which the motor 12 is started to raise the top mould part 3, and covers a push button 29 by which the motor is started to lower the top mould part. 28 is a push button for stopping the motor. The lifting arms being set for the mould opening movement, the motor 12 is started to bend the toggle and raise the lifting arms, which are guided by the rollers 16 on the tracks 38 at one side and by rollers 17 at the other side. The movement impressed on the lifting arms 4 is such that the top mould part 3 is displaced rearwards parallel to the separation joint between the mould halves, the tyre 45 thus being tilted as shown in Fig. 4. This movement is possible because of a telescopic connection between the mould parts, comprising a piston and rod 32a, 32, pivoted at 48 to a lug on the top mould part, and a cylinder 34, pivoted to a lug on the bottom mould part. When the piston reaches the limit of its travel by meeting the cover 39 the top mould part 3 swings to the open position about the pivot 48. To close the mould, the lever 18 is moved so that the rollers 16 engage the guide tracks 30, the contour of which is such that, when the piston 32a strikes the damping spring 33, the top mould half 3 is swung into a position parallel to the bottom mould half, where it is held by projections 36 which bear on the arms 4. To allow for tyres of different widths, intermediate rings may be placed between the mould halves, and the travel of the top mould half is adjusted to compensate for those rings by inserts 44 of suitable thickness placed between blocks 41, which receive the supporting shaft 5 for the top mould part, and the upper ends of the lifting arms 4 which receive the blocks.