Air-conditioning blow-out port device and process for two-stage injection molding of the same

A process for two-stage injection molding of an air-conditioning blow-out port device,

• said device comprising:
• a housing of synthetic resin;
• a plurality of blades of synthetic resin having a blade body disposed within the housing;
• pairs of shaft bores provided in a coaxial arrangement in each pair, and being in opposed portions of a peripheral wall of the housing and extending through said opposed wall portions;
• a pair of support shafts projectingly provided on opposite ends of the blade body and rotatably fitted in said shaft bores;
• a pivotal mounting portion provided on each of said blades;
• an interlocking link for interlockingly connecting the pivotal mounting portions of the blades, said pivotal mounting portion being comprised of a pivotal supporting shaft which is projectingly provided in parallel to said support shaft at a rear edge of an end of each blade body to extend through a pivotal supporting bore in said interlocking link, and a slip-off preventing projection raised outwardly from a rear side at a tip end of said pivotal supporting shaft to engage an edge of said pivotal supporting bore;
• said process comprising the steps of:
• closing a pair of opposed primary opening/closing dies and clamping between the primary opening/closing dies a plurality of first opposed slide dies which include a plurality of shaft bore forming cores, thereby defining a cavity for forming a housing in cooperation with the shaft bore forming cores;
• primarily injecting synthetic resin into said cavity to mold said housing:
• closing a pair of opposed secondary opening/closing dies and clamping said housing between said secondary opening/closing dies and a second slide die clamped between said secondary opening/closing dies and defining a plurality of blade body-forming cavities, while defining a plurality of pivotal supporting shaft-forming cavities between one of said secondary opening/closing dies and said second slide die, said pivotal supporting shaft-forming cavities communicating with a plurality of slip-off preventing projection-forming cavities provided in said one of the secondary opening/closing dies;
• and
• using said shaft bores in said molded housing as support shaft-forming cavities and secondarily injecting synthetic resin into said blade body-forming cavities, the support shaft-forming cavities, the pivotal supporting shaft-forming cavities and the slip-off preventing projection-forming cavities to mold the blades.