Method and apparatus for molding an insulator device

Details Method and apparatus for molding an insulator device Method and apparatus for molding an insulator device

1998-06-22

2000-11-28

Davis, Robert

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

425125, 4251291, B29C 4514

Patent

active

061531405

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a device for molding a terminal composed of a base end and a resin section molded in an area extending from the base end to the halfway to a tip end.


BACKGROUND ART

For example, an insulator used in a switching device has such a structure as shown in FIGS. 6 and 7. The insulator 1 includes a terminal 2 bent at a substantially right angle at a bending section 2a at a base end. A resin section 3 having an electric insulating property is provided at the base end and an area of the halfway to a tip end 2b standing from the base end of the terminal 2.
The insulator 1 having such a structure has been conventionally insert-molded by a molding tool 4 as shown in FIGS. 8 and 9. Specifically, the molding tool 4 is composed of a fixed part 5 and a movable part 6. With the tip end 2b of the terminal 2 inserted in a holding section 6a of the movable part 6, molding resin 8 is poured into a molding space 7 formed in the molding tool 4 and solidified. Thereafter, the molding resin 8 is taken out from the molding tool 4 to mold the insulator 1.
However, in the above structure, the terminal is apt to become deformed, as indicated by a two-dot chain line in FIG. 8, owing to the pressure of the resin 8 flowing through the molding space in molding the resin section 3 (the direction of flow of the resin 8 is indicated by arrow A). In order to prevent such deformation, the thickness, width, height or strength of material of the terminal 2 is limited and hence the freedom of design is greatly restricted.
Therefore, an object of the present invention is to provide a device for molding a resin section of a terminal without causing the deformation of a terminal, which can widen the degrees of freedom in the strength and design of the terminal.


DISCLOSURE OF THE INVENTION

In order to attain the above object, the present invention, in a device for molding a terminal device in which in a state where the tip end of a terminal bent at a base end is held in a molding tool, resin having electrically insulating property is poured into a molding space of the molding tool to mold a resin section at the base end of the terminal and an area from the base end to the halfway to the tip end of the terminal, is characterized in that a supporting projecting section is provided in the movable part of the molding tool and, at the time of molding the resin section, the face of the terminal on the opposite side of the face which is apt to receive the pressure of a resin flowing in-a molding space is brought into contact with the supporting projecting section.
In accordance with the means described above, at the time of molding the resin section of the terminal device, even if the face which is apt to receive the pressure of the resin flowing in the molding space of the terminal receives the pressure of the resin, in the terminal, the face of the terminal on the opposite opposite side of the face which is apt to receive the pressure of the resin is supported by the supporting projecting section. Therefore, the deformation of the terminal by the pressure of the resin can be prevented surely.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention;
FIG. 2 is a sectional view taken in line a--a in FIG. 2;
FIG. 3 is a broken perspective view of the insulator;
FIG. 4 is a plan view of a terminal portion;
FIG. 5 is a left side view of the terminal portion partially broken;
FIG. 6 is a view corresponding to FIG. 3 showing a prior art;
FIG. 7 is a view corresponding to FIG. 4;
FIG. 8 is a view corresponding to FIG. 1; and
FIG. 9 is a sectional view taken in line b--b in FIG. 8.


EMBODIMENTS

Now referring to FIGS. 1-5, an explanation will be given of an embodiment of the present invention.
FIGS. 3-5 show the state of an insulator 11 serving as a terminal device after it has been molded. The insulator 11 includes a terminal 12 bent at a substantially right angle at a bending section 12a at a base end. A resin section 13 having an electric

REFERENCES:
patent: 3374503 (1968-03-01), Boniger
patent: 4381908 (1983-05-01), Roth
patent: 4959000 (1990-09-01), Giza
patent: 5458473 (1995-10-01), Banji

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