| 摘要 |
<p>1,256,262. Moulding tyres. A. HERBERT and M. GUHR, [trading as LEONHARD HERBERT, MASCHINENFABRIK]. 16 May, 1969 [17 May, 1968], No. 25159/69. Heading B5A. A tyre press with provision for vulcanizing tyres of different size which may be required to be re-treaded with one and the same heating bag includes an upper mould part 4 movable downwardly on to a lower mould part 6, a heating bag 18 locatable, when folded double, between cylinders 15, 17 and its edges clamped to the inner one, pressure fluid cylinders 12a, 12b acting on the base of the outer cylinder when the press is open to raise it to eject a tyre from the lower mould half, and a locking device for holding the inner cylinder at a predetermined level depending on the tyre size. The locking device may comprise a rod 27 depending from the base of the inner cylinder and clamped by a sleeve K secured to the press base. With the press open and the cylinders in position to receive an unvulcanized tyre, a seat ring 16 on the outer cylinder receives the tyre 59 whereupon an upper seat ring 48 secured to a cylinder 47 is driven downwardly relative the upper mould part by a fluid cylinder 44, and passes over the inner cylinder until a rod 51 depending from the cylinder 47 abuts a rod 36 upstanding from the inner cylinder base. The outer cylinder is thereby forced downwardly and slides along the bag which is guided into the tyre cavity by the ring 48; a little inflation pressure is simultaneously applied to the bag via passages 34, 35. When the ring 48 engages the upper bag clamping ring on the inner cylinder the upper mould half closes on to the lower mould half, and the cylinders 12a, 12b are actuated to move the cylinder 15 downwards slightly to bring the seat ring 16 into contact with the lower mould half. Pressure is then built up in the bag and vulcanization effected. Tyres of different sizes may be treated by replacing the mould parts 4, 6 and tyre seat rings and varying the height of the inner cylinder 17 with its associated bag clamping rings; for the latter purpose the rod 27 is unclamped from the sleeve K whereupon a compression spring 30 urges the cylinder 17 upwardly so that when the press is closed with the new mould parts in position the bag clamping rings take up a new position in which they are fixed by re-clamping the rod 27 by the sleeve.</p> |
