Patent ID: 7341443

Claim:
A molding device for blow-molding or stretch-blow-molding containers from heated thermoplastic preforms, said device comprising at least one mold comprising at least two half-molds that can be moved with respect to each other between an open position in which they are parted from one another and a closed position in which they are firmly pressed against one another via collaborating respective bearing faces defining a parting line, locking means being provided to lock the two half-molds in the closed position, which locking means comprising on at least one side of the mold, a first lock element in the form of a hook secured fixedly to the first half-mold along the edge of the bearing face thereof, a second lock element in the form of a hook inverted with respect to the previous one and mounted such that it can pivot, on a rotation surface, on the second half-mold, and actuating means functionally associated with said second lock element in such a way as to move the latter transversely between a locked position in which it is engaged with the first lock element to lock the two half-molds in the closed position and an unlocked position in which it is disengaged from the first lock element to release the two half-molds that can then be parted from one another, wherein, in addition: the first and second hook-shaped lock elements extend respectively over the entire height of the first and second half-molds, the second half-mold has, along the edge of its bearing face and over at least most of its height, a radially projecting flange shaped, on its face facing away from the bearing face, as an arc of a circle and able to constitute a rotation surface, and said second lock element belongs to one end of a moving part provided with a transverse projecting flange defining a bearing surface in the shape of an arc of a circle facing toward the second hook-shaped lock element and able to bear continuously over the entire height of said rotation surface of the second lock element, whereby, when the mold is closed and locked and subjected to the blowing pressure, the force to which the second half-mold is subjected is reacted, by said moving part, substantially continuously over most of its height via said rotation surface.