JPS60244520A - Hinge structure in blow molded product and method for molding the same - Google Patents

Abstract

PURPOSE:To mold a toilet main body with a hinge having strength, in molding the toilet main body, by molding an inlay groove by the core preliminarily inserted between molds and embedding a hinge pin in said molded groove. CONSTITUTION:Prior to molding a toilet main body 1, a core 8 is preliminarily adhered to the predetermined position of a mold 6. A parison is extruded into the mold 6 according to a blow molding procedure and the mold 6 is closed. after cooling, the mold 6 is opened to take out the toilet main body 1 having a required shape. Subsequently, the core 8 is pulled off from the lateral end surface of an inlay groove 2. Succeedingly, a hinge 3 is inserted into the groove to complete the assembling of a package toilet. The mount part 5 of the hinge pin 3 is clamped to a mounting blanket by rivets to be mounted in the trunk of a car.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hinge structure in a blow molded product and a method for molding the same.

For example, some package 1-lays used for the shelves of A7 automobile glue sheets are integrally molded from synthetic resin. There are various methods for molding C, but blow molding is also well known. However,
When blow molding a large item such as Package 1 to Lei, the meat may not reach enough to reach the bottle formed as the hinge part. In other words, because the end portion may not be polished and molded well, there are some lifts where the desired state of engagement between the pin and the bracket that supports it cannot be obtained. This results in poor rotational operability and detachment of the package tray. Also 1 [1-
Due to the characteristics of molding, the molded IC bottle is hollow, so there are problems with strength, and furthermore, there is a problem around the bottle after molding.
This is a protrusion that leaves a burr in the relationship, and as a result of the need to remove the burr, problems arise such as an increase in the number of pieces and a delay in work time.

Therefore, the first object of the present invention is to provide a hinge structure for a blow-molded product that has excellent strength and good operability, and the second object is to provide a more effective molding method to achieve this. Raise it. In order to achieve both of these objectives, the present invention is configured with the following points in point (9).

That is, in order to achieve the first purpose, the hinge bin is molded separately from the molded product, and the mounting bracket 1 to which the hinge bin is fixed to the molded product is designed to rotatably support the molded product. On the other hand, it is formed from a cylindrical hinge part for
A fitting vortex into which the hinge portion of the hinge pin is rotatably fitted is recessed at the center of rotation of the molded product, and the fitting vortex is shaped into an arc so that more than half of the outer periphery of the hinge portion is surrounded. It was formed in full glory.

Further, in order to achieve the second purpose, a hinge pin molded separately from the blow molded product may be recessed at a predetermined position on the molded product side and surround half or more of the outer periphery of the hinge pin. In the hinge WJ construction of a blow-molded product, which has an arc-shaped cross section on the right side and is fitted with a fitting groove that has an open end face on one side, the molded product is blown in order to form the fitting groove recessed.
1- At the time of molding, a nest capable of forming the fitting groove is removably attached to the molding surface of the blow molding die, and when the mold is opened, the molded product is fitted into the fitting groove. The nest, which is taken out at the same time, is extracted from the open end surface of the fitting groove.

Embodiments embodying the present invention will be described in detail below with reference to the drawings.

Figure 1 shows a package tray body 1 (hereinafter referred to as the 1-Heray body) used on the rear shelf of an automobile glue A7 sheet, viewed from the back side.
It is integrally molded into a hollow shape using a synthetic resin material.

1 to the main body 1 of the main body 1 are expanded from the rotation center side (lower side in Figure 1) to the free end side (upper side in Figure 1). It is formed into a predetermined shallow dish shape.

On the rotation center side of the tray main body 1, on both left and right ends of the back surface, fitting grooves 2 into which permanent hinge pins 3 can be fitted are recessed at symmetrical positions. Each of the fittings 2 is formed to open laterally and downwardly, and is formed into an arc-shaped groove cross section with a smaller opening angle than a semicircular arc so as to surround more than half the outer periphery of the hinge pin 3. (See Figure 2).

The hinge pin 3 is made of a synthetic resin material and is attached to the L-lay main body 1.
It is formed separately from the body, and is considered to be a solid body. This hinge pin 3 (G, L, 1) is a cylindrical hinge part 4 that can be loosely inserted into the groove 2 from the side opening end. It is formed integrally with the removable portion 5 having a screw hole 9 that can be tightened.

Next, an example of a method for forming the above-mentioned J: sea urchin 1 to lei body 1 will be described. The tray body 1 is molded using the blow molding method described above.

First, to briefly explain the molds used in this example, the molds are installed in pairs on the left and right, and each mold is provided with a predetermined molding surface on which the mold body 1 can be molded. FIG. 3 shows a part of the mold 6 on the side that molds the back surface of the tray body 1. This mold 6
On the molding surface 7 of the molding surface 7, the inner bottles corresponding to the two fittings M2M are each formed flat. At the time of molding, insert grooves 2 are molded and inserts 8 formed in a semi-cylindrical shape are pasted thereon.

However, regarding the method of attachment, C is double-sided adhesive l-11.
0 is used.

Now, prior to molding the 1-lay main body 1, the above-mentioned nest 8
The parison is pasted to a predetermined position in the mold 6 according to an appropriate positioning means. Under this, the parison is extruded between both molds 6 according to the normal 10-molding procedure. , the mold is closed. Then, when the mold 6 is opened after a predetermined cooling time has elapsed, the tray main body 1 of the desired shape is taken out. At this time, both the nests 8 are fitted into the fitting grooves 2. Tamamate・
It is separated from the molding surface 7 and taken out together with the tray body 1. Thereafter, the inserts 8 are each pulled out from the side end surfaces of the fully fitted parts 2 (see Fig. 4) and pasted again at the same position on the molding surface 7 of the mold 6 in preparation for the first molding operation. .

If the tray body 1 is molded as described above, the 1
~The aforementioned hinge pin 3 molded separately from the lay body 1
is rotatably inserted into the fitting groove 2, completing the assembly C of packages 1 to rays. The package tray is installed in the luggage compartment of an automobile by attaching the hinge pin 3 by tightening the portion 5 to a four-piece bracket (not shown) using screws or the like.

Next, the effects of this example will be listed.

(1) The hinge pin 3 has a predetermined quality.

This is because the hinge bin 3 and the 1-lay main body 1 are molded separately. In other words, in the case of a large molded product such as the J-eel of package 1-lay, the molding viscosity may decrease because the meat does not reach the protruding part of the wood end sufficiently. This can definitely be avoided. In addition, since it is molded separately, only the hinge pin 3 can be made into a solid body, which makes it possible to further improve the strength compared to the conventional one. In addition, the hinge pin 3 is molded integrally with the tray body 1, and the process of deburring after molding, which was conventionally considered essential for the T-culm, is no longer necessary, so the conventional process is more frugal. ]a', it is also possible to shorten old stories.

(2) The operability of packages 1 to ray is good.

(1) r: As shown, since the hinge pin 3 is molded with precision, the desired degree of fitting and leakage 2 can be achieved. Rotation repeat ('+ can be done as suff1-).

(3) The effect of preventing the hinge bin 3 from coming off from the tray body 1 is high.

This is because the fitting groove 2 surrounds more than half of the outer circumference of the hinge bin 3. This is achieved by a unique molding method according to the present invention.

In other words, if the opening and closing direction of the mold was set in the depth direction of the groove as is normally done in order to mold the fitting groove 2 having the shape described above, mold C1 would close due to interference. , the mold cannot be opened. Therefore, we have cleverly solved this problem by using a nest that is removable from the mold 6 and that can be taken out together with the tray body 1 while being fitted into the fitting vortex 2.

Although this example has been explained using packages 1 to 1 as an example, the present invention can also be widely used in other hinge groove structures such as automobile door grabs, console box hinges, etc.

As explained above, the novel hinge 4PJ structure obtained by the method according to the present invention is expected to significantly improve the molding accuracy and strength of the hinge bin, and also contribute to improved operability. I can do it.

[Brief explanation of drawings]

Figure 1 is a bottom view of the package tray, Figure 2 is an enlarged perspective view of the hinge part, Figure 3 is a perspective view of the main parts of one side of the mold, and Figure 4 is a perspective view of the insert. FIG. 3 is a perspective view showing the work of removing the product from the groove. 1...1~Rei book 44\2...II); including J+f
13... Hinge bin 4... Hinge part 5... Take (
=t G) Part 8...Input 7 Applicant Small h press affiliated stock i (association? J agent Patent attorney Oka III Fuhiko Figure 1 Figure 2 s3 Figure 1 Figure

Claims (2)

[Claims] (1) In a blow molded product equipped with a hinge bin,
The hinge bin is molded separately from the molded product, and the molded product is mounted by a mounting portion fixed to a bracket and a cylindrical hinge portion for rotatably supporting the molded product; A fitting groove is recessed in the rotational center position of the molded product to rotatably fit the hinge portion of the hinge pin,
A hinge structure for a blow-molded product, characterized in that the fitting groove is formed in an arcuate cross-section so that more than half of the outer periphery of the hinge portion is surrounded. (2) A hinge pin molded separately from the blow molded product is recessed in a predetermined position on the molded product side, has an arcuate cross section that can surround more than half of the outer circumference of the hinge pin, and has one side In the hinge structure of a blow molded product in which the end face of the blow molded product is fitted into a fitting groove with an open end, in order to provide the fitting groove concavely, the molded product is placed in the blow molding groove during molding. Six inserts capable of forming the fittings 114 are removably attached to the molding surface of the metal molding, and when the mold is opened, the inserts are taken out together with the molded product while being fitted in the fitting grooves. A method for forming a hinge structure in a blow molded product, characterized in that the hinge structure is extracted from the open end face of a groove.