BigPatents India

A molding device includes an upper mold a middle mold (20,20’, 20”), a lower mold coupling units (40,40’), and a friction (50,50’). Each of the coupling units (40,40’a lifting member (41,41’) (10,10’) (20, 20’ .20”) and extending in a di (10,10’) (30,30’) mechanism includes connected to the upper mold toward the middle mold reaction along which 10,10’) is moved to an open member (42,42’) connected (20,20’ .20”) to guide the lifting members (41,41’). The lifting members (41,41’) are located at positions symmetrical to a center line (L) which passes through the center of gravity (W) of the middle mold (20,20’,20”). The friction mechanism (50,50’) is connected to the middle mold (20,20’ .20”) and the lower mold (30,30’) fo temporarily preventing separation of the middle mold (20,20’ .20”) from the lower mold (30,30’) when the upper mold (10,10’) is moved away from the middle mold (20,20’ .20”) during an initial stage of a mold opening operation (FIG. – 3,15)