DEVICE FOR STRETCHING SPRINGS Russian patent published in 2012 - IPC B21F35/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for spring reconditioning at repair fabrics. Proposed device comprises bed, rest bolted thereto and provided with support rollers to support screw mandrel. Mandrel end has groove corresponding to stretched spring ID. Device head with built-in roller has groove made on its outer radius to correspond to stretched spring coil radius. Threaded strut accommodates pressure screw to transfer motion to head roller. Another strut accommodates screw mandrel wherein clamp with hole is fitted to fix stretched spring first coil. Screw mandrel consists of cylindrical and threaded sections, made separate to allow their replacement. Screw mandrel cylindrical section is fitted in hole made in threaded section and clamp therein to fix first coil of stretched spring in screw mandrel. Device elements ensure tight contact between roller and stretched spring coil.

EFFECT: longer life, lower reconditioning costs.

3 cl, 5 dwg