TIN COVER AND SEAM-BINDED LID Russian patent published in 2009 - IPC B21D51/26 

FIELD: mechanics.

SUBSTANCE: invention refers to metal forming, particularly to sheet metal cover structure. Drawn aluminium tin cover has a peripheral rim connected by means binding seam to an edge of aluminium tin enclosure with generally flat central panel connected by an inclined curved or rectilinear partition wall with an inclined internal wall of a ring U-shaped chamfer bit provided with an external wall coupled with an inclined bottom wall adjoining the wall holder in junction below the central panel. The wall adjoining the holder has a curved or inclined top wall coupled which an internal rim wall. In addition, the wall adjoining the holder has an intermediate wall forming a sharp bend, while internal lower width of the chamfer bit is less than radial width of the partition wall. The inclined upper wall adjoining the holder passes at an angle exceeding that of the inclined lower wall adjoining the holder.

EFFECT: improved cover quality.

15 cl, 13 dwg