Method and apparatus for the production of prestressed coil spri

Details Method and apparatus for the production of prestressed coil spri Method and apparatus for the production of prestressed coil spri

1974-11-22

1976-11-02

Larson, Lowell A.

Metal deforming

By deflecting successively-presented portions of work during...

To form helical coil or tube

72140, B21F 304

Patent

active

039889157

ABSTRACT:
A method and apparatus for producing prestressed coil springs whereby the wire is fed about a rotating spindle and taken up or drawn in with a predetermined spacing from the front end of the coils and guided to a point ahead of the front end of the coils in the form of an expanded helix. A stop block is movable along the spindle, fixed against rotation and provided with a plurality of wire grooves at different angles of inclination so that the wire passes beneath the already formed coil as it passes through one of the grooves to produce the desired stress.

REFERENCES:
patent: 548000 (1895-10-01), Lloyd
patent: 1124874 (1915-01-01), Diebel
patent: 2446755 (1948-08-01), Gates
patent: 3101750 (1963-08-01), Pfaffle

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