Bermer tool die

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Furthermore, t. Attempts have been made to use springs to cause the ejector mechanism to move out of the core "cavity, but the limitations of space prevent the use of adequate spring power; furthermore, a spring suffers from the difficulty that its force decreases linearly as it expands.

In addition, a common difficulty experienced withsprings is that they may break after many operative cycles of the ejection mold and, when this happens, there is interference between the ejector pin and the core member with resulting damage Aquite high and the valving and the hoses which are necessary constitute aV very complicated mechanism.

These and other diiculties experienced with the prior art deivices have been obviated in a novel manner by the present invention. It is, therefore, an outstanding object of the present invention to provide a die in which means is provided for "positively assuring that there is no interference between 4sideaction mechanism operation and the operation of ejector mechanisms. Another object of this invention is the provision of a die foruse in the injection molding of a plastic article in which an inexpensive means is provided for assuring that the die is not damaged by engagement between an ejector pin and a side-action core member.

The character of the invention, however, may be best understood by reference to one of its structural forms as illustrated by the accompanying drawings in which:. Referring first to FIG. The lower portion 12 is bolted -to the top surfaces of upstanding side anges 13 and 14 of a base 15 which is adapted to be mounted, in turn, on the table of an injection molding machine not shown. The side anges and 14 definesa rectilinear recess 16 in which resides an ejector plate Formed on either side of the lower portion 12 are recesses Z1 in which are slidably mounted side-action mechanisms It extends downwardly across the end surface ofthe lower portion 12 to a position adjacent the ejector plate A toggle 26 is attached at one end to the lower portion 12 and at the Vother end to the ejector plate 17; -a similar toggle 27 is Hand the ejector plate The slot.

A set screw 39 is threaded through the half 36 adjacent the lower end and extends into the slot 33 and bears against the edge of the slot 33 formed on the opposite half The toggle 26 consists of an upper link 41 and a lower link At the other end the upper link 41 is provided with a socket 44 having a substantial circular edge 45 from one end of which extends 4a straight portion 46 and which at the other end terminates in a stra-ight portion The 4lower link 42 consists of a straight rectangular center portion 43 terminating at the upper end in a circular head 49 which exactly fits the circular edge 45 of the upper lever.

At the lower end the lower link 42 is provided with a circular head 51 which fits into a socket 52 formed in a socket member The socket member is suitably bolted to the end of the ejector plate The socket 52 consists of a circular portion 54 which terminates at one end in a straight portion 55 and at the other end in a straight portion The circular head 51 of the lower link 42 is provided with a peripheral groove 57 in which resides the pointed end of a set screw 58 which extends through the side of the socket member In a similar manner, the toggle 27 consists of an upper link 59 which is bolted at one end to the upper portion 12 by means of a pivot bolt 61 and at the other end is provided with a -socket 62 in which is locked a circular head 63 at the upper end of a lower link The lower link is provided at its lower end with a head 65 which is embraced by and held in a socket member 66 fastened to the end of the ejector plate The toggles are such that the sum of the effective lengths of the links is greater than the distance between the points of attachment to the ejector plate 17 and the upper portion 12, so that they are both always in a broken condition with -the center of the toggle, i.

The lower end of the upper link 41 is provided with a circular edge 67 concentric with the circular edge 45, while the lower end of the upper link 59 is similarly provided with a circular edge 68 concentric with the circular edge of the socket 62, these two circular edges 67 and 68 embracing opposite straight edges of the finger Referring to FIGS.

These surfaces are pressed together when the die is closed, as is shown in FIG. A plastic article 73 is shown in place within the mold cavity Entering the upper portion 11 and opening on the parting surface 69 is a part 74 of the molding cavity 72, while a similar part 75 extends into the lower portion 12 and opens on the parting surface For the purposes of description, the article 73 to be molded is shown as consisting of a tubular vertical portion 76 from which extends a ange 77 in which a vertical lrow of horizontal bores is to be formed, these lbores going entirely through the flange into the bore of the tubular portion If a mold cavity were formed with fixed metal fingers to form the bores in the flange 77, it would be impossible to withdraw the article laterally of the fingers from the cavity.

For that purpose, the side-action mechanism 22 is used; it is provided with -a block 78 slidable in the lower portion 12 and has an inclined bore 79 adapted to receive the lower end of the slanted peg. At its inner side the block 78 is provided with a plurality of core members or horizontal pins 82 adapted to form the bores through the flange 77 of the molded article Extending upwardly from the base 15 is a vertical post 83 which is adapted to reside in the mold cavity '72 and to define the bores for the tubular portion 76 of the molded article.

At its upper end the shaft 83 is provided with a reduced dowel portion 84 adapted to fit in a downwardlydirected vertical socket 85 formed in the upper portion 11 of the die. Surrounding this shaft, slidable upon it, and fastened at its lower end to the ejector plate 17 is a tubular ejector pin 86 which is approximately the same cross-sectional size yas the tubular portion 76 of the molded article and is coxial therewith.

The nature of this ejector pin would, of course, vary with the type of article being molded, as would the horizontal pins 82 forming the core members. It is interesting to note that underlying the inclined bore 79 in the block 78 is a recess 87 to receive the. In addition to the slanted peg 23, the upper portion 11 is provided with an inclined block 88 bolted to the lower surface of the upper portion 11 and having an inclined surface which engages a corresponding inclined surface on the block '78 of the side-action mechanism The slide core mold for injection molding according to claim 1, wherein the undercut core is provided separately from the slider block and detachably engaged in the front surface of the slider block.

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