JPS6325626Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is made by fitting a transparent synthetic resin into the window hole of a non-transparent synthetic resin body such as a switch dial-type housing, and forming it by two-color injection. The light from the provided illumination lamp is transmitted through the translucent synthetic resin to illuminate characters, figures, etc. printed on the outer surface of the translucent synthetic resin from the back, or the rotation angle of the opaque synthetic resin body is In a lighting device for a switch that clearly indicates the on/off operating status of a switch, the molded bond between the non-transparent synthetic resin body and the translucent synthetic resin is strengthened, and the outer surface of the boundary area is This prevents crack-like peeling from occurring.

As shown in Fig. 6, the conventional switch lighting device engages with the rear side in the thickness direction of a translucent synthetic resin e that is fitted into a window hole b of an opaque resin body a and molded. A protruding ear f is integrally molded, and a hollow molded part c inside the non-transparent synthetic resin main body a is tightly joined to the outer surface g of the engaging ear f, so that the non-transparent part removed from the engaging ear f is formed. The inner surface d of the synthetic resin main body a and the inner surface h of the engaging lug f are made flush and smooth. The above-mentioned molding technique is common and the molding method is easy, but as time passes, the hole edge of the window hole b of the non-transparent synthetic resin body a and the transparent synthetic resin e
The boundary between the window hole b and the periphery that has been fitted into the window hole b peels off, producing a crack-like peeling line i shown exaggerated in the drawing, and from the surface of the transparent synthetic resin e. When the printed layer j is provided over a part of the surface of the non-transparent synthetic resin body a, the peeling line i appears more clearly. The above-mentioned drawbacks are due to various causes including minute differences in expansion coefficients between the non-transparent synthetic resin body a and the transparent synthetic resin body e. The present invention explores the causes of this problem and creates a structure that does not produce the above-mentioned peeling line i.

An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

31 in the figure is a switch, and the main case 32
A central shaft 39 is fitted into the main case 32 at the center of the upper surface of the opening so that the central shaft 39 can be freely rotated or fixed, and the surroundings of the central shaft 39 are aligned with the upper surface of the opening. Fixed contact 35
A group of illumination lamps 3 are attached on the upper surface.
The insulating fixing member 3 is provided with a rotation guide cylinder part 37 concentric with the central axis 39, and a light source leakage port 38 of the illumination lamp 36 is provided in the various guide cylinder parts 37.
4 is fitted and fixed, and the rotary knob 33 has a movable contact 41 fixed to the central shaft 39 or rotatably fitted on the inner surface thereof, and a movable contact 41 adapted to contact the group of fixed contacts 35. 40 is fitted and fixed, and then externally fitted to the rotation guide cylinder part 37 so as to be freely rotatable.

The above shows an example of a switch to which the present invention is applied, and the rotary knob 33 constitutes the non-translucent synthetic resin body 1 of the present invention as shown in FIG. A window hole 2 is formed in a part of the hanging peripheral edge 1a that is fitted into the window hole 2, and a translucent synthetic resin 11 (commonly referred to as a lens) is fitted into the window hole 2 and molded. The outer circumferential edge 12 of the translucent synthetic resin 11 that is in close contact with the inner circumferential edge 3 of the window hole 2 of the non-transparent synthetic resin body 1 has a concave portion 4 protruding into the central part of the main body 1 in the thickness direction. The embedded ear 13 is molded, and both sides 14 and 15 of the embedded ear 13 are attached to the edges 5 on both sides of the recess 4,
6 in a pinched shape.

When the embedded ear 13 extends over a horizontal portion that is bent, for example, 90 degrees from the hanging peripheral edge 1a of the non-transparent synthetic resin body 1 as shown in the figure, it is bent at an angle of, for example, 90 degrees as shown in the figure. In addition, the window hole 2 is made of non-transparent synthetic resin body 1.
When it is provided near the end edge 1b of the hanging peripheral edge 1a, or when it is provided as a notch-shaped hole from the end edge 1b, the embedded ear 13 is not molded only in the relevant part of the transparent synthetic resin 11. . However, implanted ears 13
The parts that are not molded must be limited to only the necessary parts.

The present invention has the configuration as exemplified above, and the light-transmitting synthetic resin 11 fitted into the window hole 2 of the non-light-transmitting synthetic resin body 1 has an inner peripheral edge of the window hole 2 on its outer peripheral edge 12. A concave portion 4 protrudes from the center in the thickness direction of 3.
The embedded ear 13 is formed in the outer peripheral edge 12 of the translucent synthetic resin 11, and the embedded ear 13 is formed in the recess 4 in the non-transparent synthetic resin body 1. Since it is inserted between the edges 5 and 6 of the window hole 2 and is sandwiched between the front and rear edges 5 and 6 in the thickness direction that substantially constitute the inner peripheral edge 3 of the window hole 2, it does not deteriorate due to aging. The light-transmitting synthetic resin body 1 and the light-transmitting synthetic resin 11 each warp on their own,
Or even if they try to separate due to slightly different expansion coefficients, the non-translucent synthetic resin body 1
There is no risk of peeling of the tightly joined portion between the inner peripheral edge 3 of the window hole 2 and the outer peripheral edge 12 of the transparent synthetic resin 11, and there is no possibility that fine peeling lines (see Fig. 6), which are a drawback of the conventional method, will occur in printing. Defects such as cracking of the layer or dirt entering the peel line, resulting in a dirty line, can be completely eliminated, and the possibility of spoiling the design of a switch having a window hole through which illumination light can be transmitted can be completely eliminated.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view of the central part of the switch to which the present invention is applied, Fig. 2 is a front view thereof, Fig. 3 is a plan view thereof, and Fig. 4 is an enlarged longitudinal cross-section of the main part showing an embodiment of the present invention. 5 is a front view showing only the translucent synthetic resin 11 separated, and FIG. 6 is an enlarged longitudinal sectional side view showing the conventional device and its drawbacks in an exaggerated manner. 1... Opaque synthetic resin body, 1b... Edge,
2...Window hole, 3...Inner peripheral edge, 4...Central part, 5,
6...Edge, 11...Translucent synthetic resin, 12...
Outer periphery, 13...embedded ears, 14, 15...both sides.

Claims (1)

[Scope of utility model registration request] A translucent synthetic resin 11 is fitted and molded into the window hole 2 of the non-translucent synthetic resin body 1, so that the light from the illumination lamp provided in the switch passes through the translucent synthetic resin 11. In a lighting device for a switch, an outer peripheral edge 12 of a translucent synthetic resin 11 that matches an inner peripheral edge 3 of a window hole 2 of the main body 1 protrudes into a recess 4 formed in the center of the main body 1 in the thickness direction. An embedded ear 13 is provided, and the embedded ear 13 is inserted into the recess 4.
, and both sides 14 and 1 of the embedded ear 13
5 is sandwiched between edges 5 and 6 on both sides of the recess 4.