CONCRETE INSERT FOR FASTENING IN HOLLOW AND SOLID BUILDING MATERIALS Russian patent published in 2004 - IPC

FIELD: concrete inserts. SUBSTANCE: concrete insert has anchor plates extending in longitudinal direction and spreading during screwing of stay screw into insert. Anchor plates of rear insert end are connected by sleeve-like member into which stay screw is introduced. Anchor plates of front insert end are connected by sleeve- like sharpened member into which stay screw is screwed. Anchor plates are also joined by expandable member locating along insert periphery. Sharpened member has V-shaped slots. One ledge of each slot rises towards thread pitch of stay screw, another ledge of each slot rises in opposite direction. EFFECT: easy screwing of stay screws into insert, increased reliability of connection, enhanced torsion rigidity of insert. 7 cl, 11 dwg