Lamp filament winding machine

Claim 1

IN A FILAMENT COILING MACHINE FOR THE WINDING OF FINE WIRE FILAMENTS FOR ELECTRIC LAMPS, THE COMBINATION OF: (A) A WINDING HEAD FOR SUPPORTING A MANDREL GUIDE THROUGH WHICH A MANDREL WIRE IS ADVANCED, TOGETHER WITH A BOBBIN SUPPLYING A FINE FILAMENT WIRE, AND A BRIDGE PIN, SAID HEAD BEING OPERABLE UPON ROTATION TO DRAW THE FINE FILAMENT WIRE FROM SAID BOBBIN ACROSS SAID BRIDGE PIN AND WIND SUCH WIRE IN THE FORM OF A TIGHT HELIX UPON SAID MANDREL WIRE AS IT IS ADVANCED; (B) DRAG TORQUE MEANS CARRIED BY SAID WINDING HEAD AND ROTATABLE THEREWITH FOR APPLYING A DRAG TORQUE TO SAID BOBBIN TO MAINTAIN A UNIFORM TENSION ON THE FINE FILAMENT WIRE AND PREVENT UNDESIRABLE UNSPOOLING THEREOF FROM SAID BOBBIN UPON ANY VARIATION IN ROTATION SPEED OF SAID WINDING HEAD, (C) CONTROL MEANS CARRIED BY SAID MACHINE ADJACENT SAID DRAG TORQUE MEANS AND OPERABLE TO CAUSE THE LATTER TO APPLY A PRESELECTED DRAG TORQUE TO THE BOBBIN CARRIED BY SAID WINDING HEAD, (D) AND MEANS CARRIED BY SAID WINDING HEAD AND OPERABLE UPON DECELERATION OF THE LATTER TO DECREASE THE SPEED OF ROTATION OF SAID BOBBIN AND PREVENT OVERRIDING THEREBETWEEN AND THEREBY MAINTAIN SUFFICIENT TENSION OF SAID FINE FILAMENT WIRE TO ELIMINATE TANGLING THEREOF.