Stroller apparatus for juvenile car seat

In combination with a juvenile car seat having a supporting base formed of tubular members and adapted to be positioned on a vehicle seat;

• a stroller apparatus for converting such car seat into a mobile stroller unit, comprising a base frame encased in a rigid shell housing defined by front, rear and opposed side wall members and having an upper car seat receiving section and a lower base frame receiving portion, said base frame including laterally spaced outer side frame members and front and rear frame members interconnecting said side frame members, said base frame members being confined and secured within said front, rear and opposed side wall members of the lower portion of said shell housing to form an integral unit and said front, rear and side wall members also defining an open central area for direct access through the upper car seat portion thereof to said base frame, a set of front wheels mounted on said base frame for conjoint movement between an extended stroller position and a retracted car seat position in which said front wheels are recessed within said shell housing, a separate set of rear wheels mounted on said base frame for conjoint movement between an extended stroller position and a retracted car seat position recessed within the shell housing, each of said sets of front and rear wheels including laterally spaced apart pairs of elongated leg members disposed substantially parallel to said side frame members, said pairs of front and rear leg members having adjacent inner ends connected for turning movement relative to said base frame and remote outer ends having said front and rear wheels rotatably mounted thereon, lever means constructed and arranged for selectively actuating said leg members to move said wheel sets between said extended and retracted positions, extensible handle means on said stroller apparatus and being constructed and arranged for movement between an extended operative stroller position and an inoperative car seat position, releasable locking means for locking said handle means in at least one of said positions, and releasable latching means carried on said base frame and comprising a plurality of movable latch elements for engaging the tubular members of said supporting base to interlock said supporting base directly to said base frame, said base frame having slide bars traversing said frame members and orientation blocks adjustably secured on said slide bars, said latch elements being carried on said orientation blocks to an adjusted position aligned with the tubular members of the car seat supporting frame, and said latch elements having an open condition for receiving said tubular members and a closed condition for the releasable locking thereof.