JPH0418837Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an undercut treatment device for an injection mold used for injection molding an article having a plurality of undercuts inside.

(Prior Art) A mold for injection molding an article having an undercut is provided with an inclined slide core, and when the molded product is removed from the injection mold, a part of the mold is allowed to escape in an oblique direction. ing. However, as shown in FIG. 4, when two inclined slide cores 21 and 22 are provided in positions close to each other in the injection mold 20, the second inclined slide core 2
If the rods 26 of 2 are extended as they are, the two slide blocks 2 on the ejector plate 23
4 and 25 overlap and interfere with each other, the first inclined slide core 21 has a normal type sliding structure, but the second inclined slide core 22 has a structure in which a pin 27 is provided in the middle of the rod 26. There are times when I have no choice but to do so. However, the undercut treatment device as shown in Fig. 4 has the disadvantage that a large force is repeatedly applied to the pin 27 when the ejector plate 23 is raised, resulting in poor durability and the pin 27 being easily broken. .

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and even when it is necessary to provide two inclined slide cores in close proximity to the injection mold, each inclined slide This was completed with the aim of creating an undercut treatment device for injection molding molds that allows the core to operate smoothly and has excellent durability.

(Means for solving the problem) The present invention is based on two
A second slide block for operating the other inclined slide core is slidably attached to the upper surface of the first slide block for operating one of the inclined slide cores. It is.

(Example) Next, the present invention will be explained in more detail with reference to the examples shown in FIGS. 1 to 3. 1 is an injection mold;
Reference numerals 2 and 3 indicate undercut portions provided in positions close to each other on the injection mold 1, and reference numerals 4 and 5 indicate first and second undercut portions provided corresponding to each undercut portion.
This is an inclined slide core. Reference numeral 6 denotes an ejector plate provided below the injection mold 1, and the tip of a rod 7 extending from the first inclined slide core 4 is slidably supported on the ejector plate 6, as in the conventional case. It is fixed to the first slide block 8. In the present invention, a second slide block 9 is attached to the slide block 8 so as to be slidable relative to the first slide block 8, and the lower end of the rod 10 extending from the second inclined slide core 5 is attached to the second slide block 8. 2
It is fixed to the slide block 9 of. In this embodiment, as shown in FIG. 2, the rod 7 of the first inclined slide core 4 is located in the center, and the rods 10 of the second inclined slide core 5 are located on both sides. The detailed structure is not limited to this.

(Function) In the device constructed as described above, the molded product 20 having an undercut inside is molded as shown in FIG. approach towards. At the same time, as shown in FIG. 3, the first inclined slide core 4 is connected to the first slide block 8.
At the same time, the second inclined slide core 5 is also pushed upward obliquely by the second slide block 9. In order for such push-up to be performed smoothly, each slide block 8, 9 needs to be able to slide freely relative to the ejector plate 6, but in the present invention, as clearly shown in FIG. In addition, since both slide blocks 8 and 9 can mutually slide freely and without interfering with each other, each inclined slide core 4 and 5 can each smoothly slide obliquely upward. As a result, molded product 20
In the process of being pushed upward as shown in the figure, each inclined slide core 4, 5 comes off from the undercut of the molded product 20, and the molded product 20 can be removed without any trouble. Moreover, since the rods 7 and 10 are both straight-shaped rods that have been widely used in the past, they have excellent durability and are free from the risk of breakage as shown in FIG. 4.

(Effects of the invention) As is clear from the above description, the present invention has the following advantages:
The two inclined slide cores disposed close to each other can be operated smoothly without mutual interference, and have excellent durability. Therefore, the present invention has extremely great practical value as an undercut treatment device for injection molding which eliminates the problems of the conventional method.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view of the main part as seen from the left side of Fig. 1, and Fig. 3 is a sectional view showing an embodiment of the present invention.
The figure is a sectional view showing an operating state, and FIG. 4 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Injection mold, 4, 5... Inclined slide core, 8... First slide block, 9... Second
slide block.

Claims (1)

[Scope of utility model registration request] A first slide block 8 for operating one of the two inclined slide cores 4 and 5 provided in the vicinity of the injection mold 1 has a plate on the upper surface thereof for operating the other inclined slide core 5. An undercut treatment device for an injection mold, characterized in that a second slide block 9 is slidably attached.