JPS6151702A - Manufacture of shade for lighting fixture - 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 Field of the Invention The present invention relates to a method of manufacturing a shade for a lighting fixture, which involves integrally fusion-bonding two or more shade bodies.

Conventional structure and its problems Traditionally, in order to give a shade different textures, methods such as partially printing on the shade or forming a satin pattern or a large number of lips on the shade have been used. However, with the former, there was a problem that the printing peeled off and the appearance deteriorated due to long-term use, and with the latter, there was a problem that it was impossible to vary the color locally.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a shade for a lighting fixture, which has almost no risk of deterioration in appearance even after long-term use, and allows for partially varying colors.

Structure of the Invention In order to achieve the above-mentioned object, the method for manufacturing a shade for a lighting device of the present invention includes a first step of molding a first shade body, a step of molding a second shade body, and a step of molding the first shade body. a second step of integrally fusing the two shade bodies, and in the second step, the mold is provided with a gas vent hole located corresponding to the boundary between the two shade bodies. The gas vent hole facilitates the removal of air from within the mold when molding the second shade element, thereby improving the welding to the first shade element. .

Description of examples Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the first step, in which a first shade body A is molded using upper and lower molds 1 and 2.

The first shade body A is molded from a synthetic resin such as styrene or acrylic, has a red color, and constitutes, for example, the lower part of the shade. During molding, the mold 1 is lowered to the position indicated by the dotted line, and the heated molten synthetic resin is press-fitted into the gate 1a, and a well-known runner (not shown) extending radially from the lower end of the gate 1a is used to connect the molds 1 and 2. It is injected into a space and molded into a predetermined shape, and the mold 1 is raised to take out the first shade body A.

FIG. 2 shows the second step, in which the second shade body B is molded by the upper and lower molds 3 and 4, and is integrally fused with the first shade body B. The second shade body is molded from synthetic resin such as sterol or acrylic, has a white color, and constitutes, for example, the upper part of the shade. At the time of molding, first, the first shade body A molded in the first step is held near the outer periphery of the mold 4, and then the mold 3 is lowered to the position indicated by the dotted line, and the heat-molten synthetic resin is Press in. This synthetic resin is injected into the space between the molds 3 and 4 by a well-known runner (not shown) extending radially from the lower end of the gate 3a, and the resin is injected into the space between the molds 3 and 4.
When reaching the edge of the first shade body A, the edge of the first shade body A is melted by the synthetic resin, and both shade bodies A and B are fused together. FIG. 3 is an enlarged view of the boundary between both shade bodies A and B, and the boundary C between both shade bodies A and B forms a diagonal step shape.
Care is taken to ensure good mutual fusion. and,
Since the mold 4 is provided with a gas vent hole 4a located corresponding to the boundary C between the two shade bodies A and B, the air contained in the space between the molds 3 and 4 is removed before injection of the synthetic resin. In order to be able to release the synthetic resin well and to reach the entire circumference of the edge of the first shade body A, both shade bodies A,
B can be fused and bonded all around the circumference without any gaps.

This gas vent hole 4a is formed in the mold 4 with a mold 8 4b,
A slight gap between the eight molds 4b and the donut-shaped outer mold 4c is utilized. Incidentally, in the first step, the slight gap between the molds 1 and 2 is used as a gas vent hole, but in the second step, the gap a between the molds 3 and 4 is used as the first shade element A. Because it is inserted,
It cannot be used as a gas vent hole, and as described above, for example, it is formed as a gas vent hole 4a by intentionally configuring the mold 4 like the 8 mold 4b and the outer mold 4C. The first shade body A is shown at the end, and FIG. 5 shows the state in which the first shade body A and the second shade body B are combined to form a shade at the end of the second step.

It is clear that a shade consisting of three or more shade bodies can also be manufactured using the same concept.

Further, the shape of the joint between the shade bodies can be manufactured in any desired shape, such as a wave shape, in addition to a straight shape as shown in the embodiment.

Effects of the Invention As is clear from the above description, according to the present invention, 2
It is possible to manufacture shades for lighting equipment by integrally fusing and bonding two or more shade bodies, so by varying the texture of each shade body, such as hue, saturation, pattern, etc., it is possible to create shades with a design effect. Moreover, there is almost no risk of deterioration in appearance due to long-term use.Furthermore, since the mold is provided with gas vent holes that correspond to the boundaries of adjacent shade elements, manufacturing defects can be almost completely eliminated, and the shade element It has excellent effects such as good bonding between bodies.

[Brief explanation of drawings]

The drawings all relate to one embodiment of the present invention, and FIG.
2 shows the second step, FIG. 3 shows an enlarged view of the main parts of the second step, and FIG. 4 is a perspective view of the first shade body completely formed in the first step, FIG. 5 is a perspective view of the shade completely formed through the second step. A...First shade body, B...Second
Shade body, C... Boundary, 4... Molding mold, 4a... Gas vent hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure (α Figure 4 Figure 5

Claims (1)

[Claims] a first step of molding a first shade body; a second step of molding a second shade body and integrally fusing it with the first shade body; A method for manufacturing a shade for a lighting device, characterized in that a mold is provided with a gas vent hole located at a position corresponding to the boundary between both of the shade bodies.