Patent GB-190220423-A (GB)
Title: An Improved Machine for the Manufacture of Artificial Stones, Tiles and the like.
Inventor: BROECKER HEINRICH
Filed: 1902-09-18
Granted: 1903-01-08
Abstract: 20,423. Br÷cker, H. Sept. 18. Moulding blocks, slabs, and tiles.-Relates to a machine for the production of artificial stone, tiles, &c., and more particularly for the production of figured stones and tiles on which colouring-matter is strewed after the moulding operation. Fig. 1 shows the machine in side elevation, and Fig. 2 in plan. The material to be moulded is contained in a filling-box 1, Figs. 1 and 4, adapted to be closed by a slide 2 when the mould 3 is not beneath it. The mould carriage runs on rails 4, and is traversed backwards and forwards by means of tension rods 5, which are gripped between friction discs 6, 6<1>. The mould pushes the slide 2 back from beneath the box 1 when it moves towards the left for a fresh charge, and the hooks 8<1> engage with hooks 8 so that the slide 2 is drawn back with the mould when it returns towards the pressing-devices. The rod 7 rides up on an incline 10, and releases the slide when it is once more beneath the filling-box. A pushing or pressing roller or brush 11, of the same general configuration as the slab or tile to be moulded, is geared to run at a higher peripheral speed than the mould carriage, and serves to consolidate the material in the mould. The final compressing and moulding of the material takes place when the mould carriage passes beneath the smooth-surfaced mould cylinder 13, which, in the machine illustrated, produces a tile of the crosssection shown (at the ejecting point) in Fig. 14. In order to cause a uniform action of the cylinder 13 on the materials in the mould, the mould carriage is reciprocated so that the materials pass three times beneath the cylinder. This is effected as follows :-After the mould has passed beneath the cylinder 13 for the first time, a pawl 33 on the mould carriage turns the ratchet-wheel 25 through one tooth, and causes a nose of the cross-shaped cam 26 to depress a roller on the vertical slide 27 and rock a lever linked to an arm 31 on the shaft 21. The turning of the shaft 21 thus produced causes a tappet 22<1> to be interposed in the path of a pin 24 on the mould carriage. The shaft 21 is therefore moved lengthways when the pin 24 reaches the tappet 22', and the lever 19 and beltchanging device 17 are operated so as to reverse the rotation of the main shaft 12 of the machine. The mould is then carried back beneath the cylinder until the tappet 22 is struck, when a second reversal is effected. The ratchet-wheel 25 being turned through another tooth, the slide 27 is released, and the pin 24 passes on clear of the tappet 22<1>. It ultimately strikes the tappet 23<1>, when reversal takes place and the mould returns to receive a fresh charge. Before the tappet 23<1> is reached, however, the mould passes beneath a colour-strewer 34 and over the ejecting-plate 44. A brush 35, driven by friction bars or toothed racks on the mould carriage, rotates above the sieve bottom of a colour-container, and scatters the pigment on the surface of the moulded stone. A spring smoother 42 presses down the layer of colour which has been deposited. Ejection is effected by a plate 44, which lifts the ejecting-pins 48, Fig. 14, when the pin 47 engages with the forked end of the lever 46. Fig. 16 shows a cylinder 13 with nose 51 and recess 50' adapted for the production of flanged roofing-tiles 50. The uprights 52 co-operate with a cam-like disc 54 on the shaft of the cylinder 13 so as to ensure the proper register of the cylinder with the mould 3 in spite of any backlash in the gearing. The cylinder is preferably heated, either internally by steam supplied through a hollow shaft, or externally by gas flames impinging on it.