CASTING MOULD FOR PRODUCING POLYMERIC ARTICLES WITH RING UNDERCUTTINGS Russian patent published in 1994 - IPC

FIELD: manufacturing of building materials. SUBSTANCE: mould has fixed plate 1, plate-copy 2 connected with it, intermediate plates 3 and 4 with grooves connected between themselves with spring-loaded limiters 30. The segments of the compound symbol are provided with spring-loaded bars 8 of rectangular form with rollers 14 on the face ends. The bars are mounted for different magnitude axial displacement in the grooves of intermediate plates and for interacting in succession with plate-copy 2 and with intermediate plate 3 adjoining it. The ejection mechanism comprises tail end 16 mounted along the mould axis in the movable plate, spring-loaded disk 17 connected with the tail end and a pair of double-arm levers 19. Some arms are connected between themselves by means of traction 22 with stop 24 at the end, and other arms with disk 17 and spring-loaded pusher. EFFECT: facilitated manufacture of articles with solid undercuttings. 1 cl, 8 dwg