Closure mechanism for an injection molding machine or extrusion press

A closure mechanism for an injection molding machine or extrusion press, comprising frame means, a number of rods extending essentially in parallelism with one another, a first tool support fixedly connected with said frame means and a second tool support displaceable along said rods, a hydraulic mechanism for displacing the second tool support along said rods, said rods being equipped with engaging means, said second tool support being provided with engaging elements which can be engaged with the engaging means of the rods, said rods being displaceably connected with the first tool support, said hydraulic mechanism comprising at least one displacement device serving to displace the second tool support with respect to the rods and for each rod an additional displacement device fixedly connected with the first tool support and serving to displace each associated rod with respect to the first tool support, each rod possessing a number of lengthwise extending ribs distributed over its periphery, said lengthwise extending ribs being provided with threading forming said engaging means, and each engaging element possesses a threaded bore pierced by one of the rods and provided with lengthwise extending grooves corresponding to the ribs of the rods.