Patent GB-189722684-A (GB)
Title: Improvements in Presses for the Manufacture of and Undercutting of Tiles, Bricks, and other Articles.
Inventor: DALTON THOMAS
Filed: 1897-10-04
Granted: 1898-08-27
Abstract: 22,684. Dalton, T. Oct. 4. Moulding tiles, bricks, &c.-Dies or plungers for producing undercut recesses in the backs of facing-tiles and bricks are provided with pivoted, sliding, or movable projecting arms or tools, and cams, springs, links, or racks for automatically throwing them into and out of action. Fig. 2 is a vertical section showing an upper plunger A suspended from a ring a attached to the screw of a press. The undercutting-tools 7 are pivoted in a head carrying the die plate 2, and are provided with studs 6 working in inclined slots in the flattened end of a vertical operating- spindle d. The spindle is forced down to bring the tools into action when the ring a comes in contact with the upper end of the spindle, and a spring f, bearing against a collar e on the spindle, raises the spindle, and withdraws the tools from the undercut recesses of the tile on the upward motion of the screw. The plunger is connected to the ring a by a hollow flanged neck c, which is screwed into the plunger and arranged to slide in the ring. A flanged sleeve or socket b, screwed into the ring a, retains the flanged neck within the ring. In the arrangement shown in Fig. 5, the undercut recesses are produced by wedge-shaped pieces 8 which are arranged to slide on pins 9, and are forced outwards by the wedge-shaped end d<2> of the vertical spindle m. When the pressing-plunger is raised, the spindle is forced upwards by a spring o, and the undercutting-tools 8 are pressed inwards by springs 10. The plunger head H is screwed into a sleeve l arranged to slide in a crosshead h attached to the pressing-screw by a split collar. A bush k screwed into the head h forms a stop for the collar l<2> of the sleeve l, and a screw g entering a slot in the sleeve prevents the sleeve from turning within the head. Escape holes 11 are provided in the plunger. Fig. 10 shows an arrangement of pivoted undercutters 12 thrown into and out of action by a toothed spindle d<3> engaging with teeth of the cutters. In another arrangement, pivoted undercutters are thrown into action by a cam, and out of action by springs. In another form, the spindle is connected to undercutting-levers by links. The undercutting-blades 17 may be pivoted to the spindle d<6>, and slide in grooves 18 of the plunger, as shown in Fig. 13. Fig. 18 shows the application of the invention to the bottom die or plunger. The side portions 20 are pivoted to a crosshead 23 at the upper end of a spindle G, and are formed with trip-pieces 22 which strike against the central wedge-shaped portion 19 when the spindle is forced up. The central wedge 19 is secured to a sleeve F, and the spindle and sleeve are forced downwards by springs H, J. The die may be split as shown in Fig. 22, and the halves may be pivoted and forced apart when clear of the mould by pins working in inclined slots of the spindle. Several forms are described in which the cutters are pivoted to the die, and acted on by cams or projections on the spindle, or cam pieces on a base-plate or socket. Fig. 39 shows a die carrying cutters with tails projecting through slots in the sides of the mould. Adjustable wedges 46, bolted to the table, regulate the extent of the undercut. In this arrangement springs are dispensed with, and the cutters are au.tomatically retracted on the upward motion of the die. In other forms, a spindle or crosshead carries a wedge or pins working in slots of undercutting-levers, and a bent or coiled spring in compression is interposed between a flange of the spindle or the crosshead and the die. Disclaiming references are made to Specifications No. 20,280, A.D. 1891, No. 6661, A.D. 1893, No. 17,366, A.D. 1894, Nos. 4602 and 7198, A.D. 1896, and No. 224, A.D. 1897.