Patent ID: 7435071

Claim:
A clamping unit for an injection-molding device for processing thermoplastic, thermosetting or elastomeric material, comprising: tie bars arranged in vertical alignment, a displaceable platen arranged between two fixed platens, an upper fixed platen and a lower fixed platen, kept at a distance by means of the tie bars, one half of an injection mold arranged on the upper fixed platen and the other half of the injection mold arranged on the displaceable platen, a single centrally located force generating element arranged between the lower fixed platen and the displaceable platen and fastened centrally to the displaceable platen, a movable locking element on the lower fixed platen which, in a controlled manner, either forms a stop for the force generating element on the lower fixed platen or exposes an opening for at least part of the force generating element to enter the lower fixed platen; wherein the force generating element is a hydraulic piston-cylinder system, comprising: a single cylinder connected to the displaceable platen and a single piston extending vertically downward in an axial direction from the cylinder; the locking element is a plate and is mounted displaceably in the horizontal direction in a guide; the opening is formed centrically in the lower fixed platen for the entry of the piston; and the lower fixed platen rests on a shop floor without a pit thereunder.