MOULD TO MANUFACTURE CONCRETE AND REINFORCED CONCRETE PRODUCTS WITH PASSAGE FOR ELECTRIC WIRING Russian patent published in 1998 - IPC

FIELD: manufacture of construction structures - products of large-panel house-building. SUBSTANCE: mould has tray with sides through which holes ends of flexible tubular passage former are passed and arms fixing positions of passage former made fast to tray and sides. Each fixing arm is fabricated in the form of pair of cylindrical rollers with conical grooves which contact passage former located between them. Distance between rollers, their height and diameter, height of arrangement of grooves in rollers and their dimensions amount with reference to diameters of passage former correspondingly to 0.75, 1.30, 0.66, 0.75 and 0.25. Angle between conical generators of grooves amounts to 145-150 deg. End of passage former attached to side is bent at right angle. EFFECT: reduced labor input for installation of passage formers, enhanced reliability of their fixing and efficiency of their removal from concrete. 3 cl, 9 dwg