Patent ID: 7905720

Claim:
A molding unit for an installation for blow-molding or stretch-blow-molding containers from blanks made of thermoplastic material, said molding unit comprising: a pair of half-molds, each half-mold being provided with at least one mold half-cavity, respectively mounted on two supports which are mobile in horizontal translation in a transverse direction perpendicular to a longitudinal direction for supplying said blanks, between a closed position in which said supports are brought together and where said half-cavities jointly form a lateral wall of a mold cavity and an open position in which said supports are separated from one another; a primary transmission controlling displacement of said half-mold supports; a mold base mounted on a support which is mobile in vertical translation in a direction perpendicular to said longitudinal and transverse directions, between an upper position in which an upper surface of said mold base completes said mold cavity in said closed position of said supports and a lower position spaced apart from said upper position, below said upper position; a secondary transmission controlling displacement of said mold base support; a locking device which comprises two locks, each cooperating with a respective half-mold support, mobile in translation between a locked position in which said locks lock said half-mold supports in said closed position, and a released position in which said locks permit the passage of said half-mold supports into said open position; and a tertiary transmission controlling displacement of said locks, wherein said primary transmission comprises a primary cam mounted on a rotating shaft driven by a motor, in addition to a primary cam follower cooperating with said primary cam and coupled to each said half-mold support; said secondary transmission comprises a secondary cam mounted on said rotating shaft, in addition to a secondary cam follower cooperating with said secondary cam and coupled to said mold base support; and said tertiary transmission comprises a tertiary cam mounted on said rotating shaft, in addition to a tertiary cam follower cooperating with said tertiary cam and coupled to each said lock.