Patent GB-236637-A (GB)
Title: Improvements in stereotype plate moulds
IPC: B41D3/00
Filed: 1924-04-08
Abstract: 236,637. Thornton, A. A., (Plainfield Trust Co.). April 8, 1924. Stereotype, casting. In a stereotype-plate mould consisting of a fixed back 10, Fig. 3, and a core 14 capable of being moved into and out of the back, mcvable packing-strips 42, Fig. 9, are provided at the straight edges of the back adapted to engage the edges of a flexible matrix M in the back during casting, each strip being moved into position t'o receive the matrix again when the core is moved out of the back after one casing operation, by means of a finger 65 movable inwardly toward the casting space between the back and core. The packing-strips 42 are loosely pivoted on pins 46 in recesses 45 in the back, and the fingers 65 are slidable on brackets 66 attached to the back. Initially a flexible matrix M is placed in the back with its lower bolster resting on a ledge, as described in Specification 236,867, and its side bolsters B beneath the fingers 65 which are then in the innermost positions. A thin metal pouring sheet 55, as described in Specification 236,868, curved to fit the back is moved into the back so that its lower edge comes over the top of the matrix, the sheet serving to guide the molten metal past and over the top edge of the matrix. A ring 25 pivoted at 27<a> and supported by a spring 94 at its opposite edge, forms the bottom of the casting chamber and supports the core 14 when it is in casting position within the back 10. The core 14 is carried by brackets 16 having side extensions bearing rollers moving in V-grooves 13 on the side frames 12 of the machine. The end of the brackets 16 nearer the back 10 carry a shaft 21 to which is attached a lever 22 pivoted at 23 to the part 24 of the machine, frame. As the core is moved along the rails 13, this shaft and lever serve to tilt the core until its end rests on the ring 25 and the spring 94 is compressed. Means for locking the core to the back and at the same time forming side walls to the casting chamber, comprise two bars 34. Fig. 8, mounted between the brackets 16 and the core, and connected bv toggle links 36 to a central sliding rod 38. An operating lever is connected to one of the toggle links, so as to move the bars 34 apart, projections 40 on the bars being adapted to engage beneath projections 41 on the back so as to lock the core to the back. At the same time, these projections 40 force, back the fingers 65 and grip the matrix bolster B at each side between faces 44 and the packing-strips 42. The toggle-operating lever also serves to move the core into the back 10. Recesses 47, Fig. 9, in the bars 34, Figs. 8 and 9, form a circumferential extension of the casting chamber, and also a recess G at each side of the cast to take the guideways J, Fig. 13, of a finishing-machine having a shaving knife K. The recesses 47 do not extend the full length of the bars 34, so that longitudinal recessed nortions S, Fig. 3, are formed on the plate and serve for positioning the cast in a finishing-machine. When the metal has cooled, the toggle lever is operat'ed to unlock the core which is then tilted back to its horizontal position, carrying with it the casting and matrix, and also, during the initial part of its movement, the pouring sheet 55. As the core moves out of the back, the packing-strips 42 tilt back in their recess to let the casting C and matrix M pass, and afterwards, cams 71 carried bv the brackets 16 engage projections 72 on the fingers 65 and force the fingers 65 and packing- strips 42 back into position for receiving the matrix.