Method of injection-molding coil spool of ignition coil device

A method of molding a primary coil spool of a plug hole-installed stick ignition coil device for engines, the primary coil spool to be formed being cylindrically shaped and having a pair of flanges to define a main part therebetween to support a primary coil therearound in a facing relation to a secondary coil, the method comprising:

• arranging a ring-shaped gate of a molding die at a part where a portion of the primary coil spool other than where said main part is to be formed, the ring-shaped gate being circumferentially open;
• and
• injecting an insulating resin through the ring-shaped gate to form the primary coil spool.

A method of molding a primary spool of a stick ignition coil device to be installed in a plug hole of an engine, with a secondary coil and a secondary spool disposed coaxially inside the primary spool, the method comprising the steps of:

• positioning a ring-shaped gate of a molding die axially outside a winding area where a winding portion of the primary spool, which supports a primary coil thereon and faces the secondary coil, is to be formed, the ring-shaped gate being circumferentially opened;
• and
• injecting an insulating resin through the ring-shaped gate to form the primary spool.