SPIRAL FORMING APPARATUS Russian patent published in 2005 - IPC

FIELD: equipment for winding spirals, possibly for spring mats, soft furniture.

SUBSTANCE: apparatus includes wire drawing mechanism having two drawing rollers; cylindrical mandrel mounted by cantilever fashion; guide arranged just near mandrel and having duct with diameter equal to that of wire used for winding spiral. Inlet part of mandrel is rigidly secured to housing of apparatus. Mandrel has groove in its outer cylindrical surface; said groove has three portions. One portion of groove is formed on inlet part (according to motion direction of wire) of mandrel along its generatrix and it has cone flare turned by its wide side to guide. Other portion of groove is arranged on outlet end of mandrel and it is in the form of helix with 1/3 - 2 turns having parameters of wound spiral. Third portion of groove is intermediate between said both portions, it extends along line joining them. Depth of groove is equal to diameter of wire used for winding spiral. Guide is wedge shaped one; it is rigidly secured to housing of apparatus and its wedge is turned to drawing rollers. Duct of guide is oriented along wire fed direction.

EFFECT: simplified design, enhanced operational reliability of apparatus.

2 cl, 4 dwg