Metal deforming – By deflecting successively-presented portions of work during... – To form helical coil or tube
Reexamination Certificate
2005-08-02
2005-08-02
Larson, Lowell A. (Department: 3725)
Metal deforming
By deflecting successively-presented portions of work during...
To form helical coil or tube
C226S181000
Reexamination Certificate
active
06923034
ABSTRACT:
A wire spring forming apparatus which can twist a direction of the wire material so as to coincide with a forming direction of the forming tools with a small moment of inertia by positioning a center point of gravity of the pressure feed rollers and a power transmitting means or transmitting a drive force to the pressure feed rollers near the axis of revolution, and has no deflection load in application of pressure to the pressure feed rollers, structured such that one pressure feed roller and a power transmitting means for the pressure feed roller are mounted to a main portion main frame of a revolving means rotatably supported to a main body frame, and another pressure feed roller is mounted to supporting arms swingably attached to a fulcrum shaft rotatably supported to the main frame in perpendicular to a pressure feeding direction of a wire, in the state that gears for driving the pressure feed rollers assembled with the respective pressure feed rollers are engaged together, and the pressure feed rollers are positioned at the substantially middle of a spindle having both ends supported or pivoted to the main frame and the supporting arms, and a point of application of pressure with respect to the pressure feed roller in the side of the supporting arm is positioned immediately above the pressure feed rollers.
REFERENCES:
patent: 738933 (1903-09-01), O'Donnell
patent: 2168340 (1939-08-01), Hill
patent: 5363681 (1994-11-01), Speck et al.
patent: 5657657 (1997-08-01), Welsh et al.
patent: 6151942 (2000-11-01), Itaya
Larson Lowell A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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