Patent GB-190706396-A (GB)
Title: Improvements in the Manufacture of Bricks or like Articles made from Powdered Clay or like Material.
Inventor: STANLEY REGINALD
Filed: 1907-03-16
Granted: 1908-03-16
Abstract: 6396. Stanley, R. March 16. Moulding bricks. - Bricks formed from clay dust are faced with a layer of fine dust, which is supplied to the mould at the same time as the main portion or "body-dust," the whole being then pressed together to form a complete brick. Various devices for supplying the two kinds of clay dust to the mould are described. Fig. 1 shows a form in which two plates D', D' form a chamber 11 in the front of the feedbox a to convey the facing-dust to the mould E. Body-dust is supplied through a hopper a<1> and facing-dust through a small auxiliary shoot b<1>, which is normally closed by a spring-retained bottom plate b<2>, stops b<4> being provided on the end of the feed-box for opening the shoot b<1> when the feedbox is under the hopper a'. The bottom of the feed-box is closed by a plate 2<c>, Fig. 5, which is withdrawn, when the feed-box is in position over the mould E, by means of the engagement of projecting pins q, carried by levers 6<c> connected to the plate by links with stops 9<d>. The slide is retained by a spring 10. The plates D', D<2> are carried by levers E<1>, E<2>, Fig. 1, which are rocked by the engagment of a stop with projections on the lever when the feed-box a is near the end of its travel ; this causes the plates to descend into the mould E and deliver the layer of facing-dust, the body-dust being delivered at the same time. As the feed-box continues its movement, the projections ride over the stop, allowing the plates D', D<2> to be raised by means of springs; the projections are so formed that the plate D<1> rises first. Fig. 7 shows a modification in which the levers E<1>, E<2> are operated by the ends 16<b> of the levers 16 which actuate the feed-box a through pin-and-slot devices. The facing-dust chamber 11 may be in the form of a box open at top and bottom. The apparatus may be modified so that facing-material is supplied on more than one side of the brick. The plates D', D<2> may be withdrawn upwardly so that the facing-dust is left in the chamber in the feed-box and falls into the mould together with the body-dust. Where the facing-dust is of a loose nature, means are provided for moving the plates D<1>, D<2> towards each other to press the facing-dust into a flat cake which drops into the mould more readily. Fig. 13 shows a modified means for withdrawing the bottom plate 2<c>, in which the levers 6c are rocked by means of links 4<b> carrying stop-bolts q which engage with stops 9<d>. Fig. 11 shows a modification in which the bottom plate is formed in two portions 2<a>, 3<a> operated by means of levers 6<a>, 6<b> connected by links 4, the levers 6<b> carrying pins 7<a> which engage with stops 9<a>, 9<b> on the frame to close and open the slide. To prevent the facing- dust from falling prematurely into the mould, the space between the plates D', D<2> is closed by a plate 22, Fig. 15, hinged to the plate D', which is turned when the plates are in their lowered position by means of rods 23 carrying stops at their upper ends. Instead of the double plates, a single plate may be employed, either in the feed-box or in the mould, to form a chamber for the facing-dust. Fig. 24 shows the application to a hand brick-press, in which a plate 5 is carried by a frame 8 slidably mounted in guides 9 carried by guide-rods 14. The plate 5 is lowered into the mould and facing- dust is fed from a sifter through a hopper 17 which is lowered on to the mould. The body-dust is also fed in aud the frame 8 is raised and withdrawn and the plunger N lowered to compress the material. A plate 6 prevents the body-dust from overlapping the facing-dust, and an inclined plate 7 presses the body-dust against the facing-layer as the plate 5 is raised. Fig. 29 shows a modification in which the chamber in the feed-box is divided by a plate or plates 5<a>, 5<b>, 5<c>, the descent of the body-dust being regulated by means of projections 26, Fig. 30, or 27, Fig. 31. The facing and body dust may be caused to fall together by causing a sudden blow or jar to be given. To ensure the complete filling of the chamber 11 when a very thin facing-layer is employed, the facing-material is supplied in a loose state by a vibrating sieve 15<a>, Fig. 34, which is rocked against the action of a spring 33 by the engagement of pins on the gear-wheel 28 with a rod 30 connected to the sieve by means of a lever 32.