JPS6187499A - Manufacturing method for speaker box net board mounting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a net plate mounting device for a speaker box, in which a recess for engagement can be formed by sink marks generated during resin cooling.

Conventionally, when attaching a net plate to a speaker box, as shown in Fig. 1, a cylindrical mounting part 2 is attached to the front plate 1 of the speaker box with screws 3, while a threaded part is attached to the net plate 4. Pi/6 having 6a, bulge 5b and flange 5C
and press-fit the pin/6 into the center hole 2a of the mounting part 2, so that the lower recess 6d of the bulge 6b engages with the protrusion 2b provided in the center hole 2a of the mounting part 2. ing.

However, when configuring such a pin 5, the second
Two molding molds 6N as shown in the figure.

It is necessary to butt the net plates 6b together, pour resin into the recesses 7 between them, and separate the molds in the directions of the arrows.Since the recesses 5d must be provided in the pins 6, the net plates 4 and It was extremely difficult to mold P/ε integrally with resin.

The present invention provides a method for manufacturing a speaker box net plate mounting device that solves these problems.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 3, 8 is a composite part of a net plate and a pin integrally molded with resin, 81L is a net plate part formed in a frame shape that covers the entire front surface of the speaker box, and 8b
80° 8d is a concave portion formed at both ends of the bottle portion 8b, and 8e is a concave portion sc and aa provided in the 67 portion 8b. This is a thick part that is relatively thicker than the tip and rear ends of the.

To resin mold such a composite part 8, molds 9a and 9b as shown in FIG. 4 may be used.

At this time, it is sufficient to simply provide the mold 9a with a cylindrical recess 9C corresponding to the pin portion 8b, that is, there is no need to provide any unevenness on the inner peripheral surface of the recess 9C.

In this state, resin is poured into the recess between the molds 9a and 9b, each of the molds 9a and 9b is separated in the direction of the arrow, the composite part 8 is released, and then cooled. Because the wall is thick, contraction is delayed compared to both ends of the pin part 8a, and as a result, after both ends of the pin part 8a solidify, the thick part 8
When the surface of e is semi-solid, it contracts inward. Therefore, a recess 8f, commonly called a sink mark, is formed around the thick portion 8e.

Therefore, this pin portion 8a is attached to the mounting part 2 shown in FIG.
When the net plate is press-fitted into the center hole 2Δ, the concave portion 8f of the bin 8a portion is engaged with the protrusion portion 2b, and the net plate can be detachably attached as in the conventional case.

In this way, the present invention utilizes the shrinkage that occurs when the resin cools to form an engaging recess around the mounting pin, so the projection of the recess for forming the recess in the molding die is There is no need to provide a section, and the mold shape can be simplified. Therefore, the net plate and the pins can be integrally molded from resin, and as a result, the manufacture of the net plate can be significantly facilitated.

[Brief explanation of the drawing]

Fig. 1 is an exploded sectional view of the conventional example, Fig. 2 is a sectional view showing the main parts of the manufacturing mold, Fig. 3 is a sectional view of the main parts of an embodiment of the present invention, and Fig. 4 is the manufacturing mold. It is a sectional view showing a mold. 8... Composite part, 8a... Net plate part, 8b... Pin part, sc, sd... Concave part, 8e... Thickness. Flesh part, 8f... Concavity due to sink mark. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 43 θ

Claims (1)

[Claims] A cylindrical mounting part is provided on the speaker box, a pin provided on the net plate is press-fitted into the center hole of the mounting part, and a protrusion provided in the center hole of the mounting part engages with a recess provided in the pin. In the speaker box net plate mounting device, the net plate is removably attached to the speaker box by fitting the net plate to the speaker box. A method for manufacturing a speaker box net plate mounting device in which a recessed portion for engagement due to sink marks generated during resin cooling is formed in the center portion.