from the position shown in fig1 towards the left and thus move mounting plate 14 and connecting plate 15 a short distance apart as a result the bush 8 attached to connecting plate 15 will move slightly relative to right mould plate 2 that is to say the gate 5 6 will be lengthened somewhat as a result of the tapering of gate 6 into bush 8 and of the widening 19 the sprue will always break in a controlled manner at the point of attachment to the product when a tensile force is exerted on bush 8 the maximum force for detaching the sprue from the article and removal from the gate is overcome with the aid of piston 16 fig2 when rod 40 is further retracted a point is reached at which plates 14 and 15 can no longer be driven further apart because they are stopped by bolt 23 after which piston 27 is driven to the right that is to say housing 26 together with mounting plate 14 are moved to the left because of the presence of the tapered sections 32 of drawing elements 31 the sprue is pulled in the manner known from the prior art from gate 6 and widening 19 of bush 8 fig3 when plate 14 is moved further to the left plate 48 is pulled to the left relative to plate 29 by hook element 49 during this movement the drawing elements come to lie entirely inside plate 48 so that the sprue is detached as.