METHOD OF MANUFACTURING CEILING T- SHAPES Russian patent published in 2003 - IPC

FIELD: plastic metal working; particularly, production of ceiling shapes. SUBSTANCE: central portion of basic strip breakdown is formed to trough-shaped contour which is convex outward, then end portions of breakdown are bent outward; peripheral portions of breakdown are brought closer together by means of successive bends in direction of breakdown symmetry axis up to contact of symmetrically located breakdown portions with formation of double wall of shape, single symmetric flanges and hollow thicker part at wall basis. Then facing is formed out of coating strip breakdown. Double wall is squeezed by discs of joining device with making notches on joint surface of double wall. Preset number of holes is punched for fastening shapes to ceiling and in between, two connecting end members are cut out. EFFECT: reduced labor input of manufacture. 36 dwg