JPH0419656B2 - - Google Patents

Description

[Detailed description of the invention] 【Technical field】

The present invention relates to the structure of a display circuit block built into a switch that lights up a display element such as a neon tube when the switch is off to indicate the location of the switch in the dark.

[Background technology]

FIG. 1 shows a sectional view of a so-called firefly type switch, in which a movable contact body 4 is swingably supported by a support protrusion 3 of a conductive metal fitting 2 arranged at the bottom of a device body 1, and the switch can be operated. Central rib 5 of handle 5
The lower half of the coil spring 7 whose upper half has been inserted into the hole 6 provided in the section a is fitted into the movable contact body 4, and the coil spring 7 is bent and reversed in response to the reversing operation of the operating handle 5, and the movable contact body 4 The movable contact 8 provided on the upper side surface of the movable contact body 4 is rotated left and right around the support protrusion 3, and as a result of this left and right rotation, the movable contact 8 provided on the upper side surface of the movable contact body 4 is rotated to the fixed terminal plate 9. It contacts and separates from a certain fixed contact 10 to turn on and off. In the figure, 11 or 12 is a locking metal fitting for a quick connection terminal, and a quick connection terminal 13 or 1 is connected to the fixed terminal plate 9 or the terminal plate portion 2a of the conductive metal fitting 2.
4. In the figure, when the movable contact 8 and the fixed contact 10 are in contact with each other, current is applied between the quick connection terminals 13 and 14, and the switch is turned on. By the way, this type of switch is equipped with a display element 15 such as a neon tube to display the position of the switch when the switch is turned off, and is illuminated through a lamp cover of the operating handle 5 made of a transparent material. However, in the display circuit block built into a conventional switch, a display element 15 and a current-limiting resistor 17 are connected in series to a printed circuit board 16 by soldering, as shown in FIGS. 2a and 2b. The block member is attached to the operating handle 5 by inserting the central rib 5a of the operating handle 5 into the hole 18 provided in the printed circuit board 16. Then, one end of one lead wire 20 of the resistor 17 is electrically connected to the upper end of the coil spring 7, and the display element 1
A contact portion 19 connected to one end of the printed circuit board 16 is provided on the lower surface of the end of the printed circuit board 16, and when the operation handle 5 is turned to the off side, the contact portion 19 contacts the upper surface of the fixed terminal plate 9, and the quick connection terminal 14, An energizing circuit is formed of the conductive metal fitting 2, the movable contact body 4, the coil spring 7, the resistor 17, the display element 15, the fixed terminal plate 9, and the quick connection terminal 13, so that the display element 15 emits light. In this way, a switch is very convenient for the user because it can display the location of the switch in the dark by incorporating a display circuit block.However, as mentioned above, the conventional display circuit block
The resistor 17 and the display element 15 are connected in series on the printed circuit board 16 by soldering, and each component is made to stand upright on the printed circuit board 16, resulting in instability and difficulty in turning the operating handle 5 on and off. There was a problem in that vibrations were transmitted and wires were broken, and assembly was very troublesome. Further, as a display circuit block using a molded substrate, there is one described in Japanese Utility Model Application Publication No. 57224/1998. In other words, in this conventional example, a molded rib base for supporting the display element is integrally provided on the surface of the molded substrate, and a locking means for locking and holding the resistor is provided protruding from the surface of the molded substrate. The connection between the resistor and the resistor is made by directly connecting the lead wires to each other by soldering, etc., and connects them in series. Therefore, the electric circuit is exposed and there is a risk of being affected by arcing when used in a switch. Furthermore, when soldering the lead wires to each other, it is necessary to bend the lead wires and place them in a position where they can be joined, resulting in poor assembly efficiency and a structure unsuitable for automatic assembly.

[Purpose of the invention]

The present invention was made in view of the above-mentioned problems, and includes a built-in switch that can stably hold the resistor and display element and prevent the lead wires of the resistor and display element from breaking even when vibrations are applied. The purpose is to provide a display circuit block for

[Disclosure of the invention]

3a to 3c show a top view, a front view, and a sectional view of the molded substrate 22 of an embodiment of the display circuit block for built-in switch according to the present invention, with the molded substrate 22 taken out;
FIG. 4 shows a cross-sectional view of a switch incorporating this embodiment, in which a molded substrate 22 has a U-shaped recess 23 on one side of its surface on which the head of a display element 15 such as a neon tube is placed. A molded rib base 24 and a rib 29 are integrally provided, a hole 18 is opened in the center for inserting the central rib 5a of the operating handle 5, and a resistor 17 is engaged on the other side of the surface. Three molded protrusions 25 are provided to protrude for stopping. A part of a metal lead plate on which an electric circuit is formed by punching is inserted into the molded board 22, and a part of the metal lead plate is made to protrude from one side of the molded board 22, and the resistor 1 is inserted into the molded board 22.
a terminal 26 for fixing the lead wire 20' of No. 7;
Terminals 28, 28 are formed to fit and fix one ends of the lead wires 27, 27 of the display element 15. Further, a contact portion 34 whose upper surface is covered with a molding material is formed at one end of the molded substrate 22 by protruding a part of the metal lead plate. This contact portion 34 has a dowel 36 on its lower surface that constitutes a movable contact that comes into contact with and separates from the fixed contact plate 9 in the switch. The molded projections 25 of the molded substrate 22 consist of two molded projections 25 on one side, and one molded projection 25 arranged in parallel corresponding to the center of the two molded projections 25, 25,
As shown in FIG. 5, the resistor 17 is press-fitted and fixed between the molded protrusions 25, 25 and 25 on both sides. At this time, one lead wire 2 of the resistor 17
0' is placed on the U-shaped portion of the terminal 26, and is fixed to the terminal 26 by snapping the U-shaped portion. The other lead wire 20'' of the resistor 17 is bent in a vertical direction from the base, and further, the middle part is horizontal and at an angle of 45 degrees with respect to the resistor 17, and its tip is bent at the center of the hole 18 of the molded substrate 22. The lead wires 27, 27 of the display element 15 are bent downward to be located at the terminal 2.
8, 28, but the lead wires 27, 27 are bent at 90° and the display element 15
The head of the display element 15 is fitted into the U-shaped recess 23 of the molding rib base 24, and the lower surface of the display element 15 is placed on the rib 29 provided parallel to the molding rib base 24, thereby molding the display element 15. It is held on the substrate 22. NaoUU
The receiving surface of the display element 15 of the molded rib base 24 may be a flat surface without providing the letter-shaped recess 23. In this way, the display element 15 and the resistor 17 are attached to the molded substrate 22, and a series circuit of the resistor 17, the display element 15, and the contact part 34 is formed via the electric circuit of the built-in metal lead plate. be. In the thus completed display circuit block of the present invention, the central rib 5a of the operating handle 5 is press-fitted into the hole 18 of the molded substrate 22 and fixed before the switch is installed. During this press-fitting, the tip of the lead wire 20'' of the resistor 17 is inserted into the hole of the central rib 5a through the cutting groove (not shown) of the central rib 5a of the operating handle 5. The operating handle 5 with the molded board 22 inserted therein is inserted into the switch body 1 as shown in FIG. 6 and is electrically connected to the lead wire 20'' of the resistor 17 inserted in the hole 6, and the contact portion 34 of the molded board 22 is placed on the lower surface of the periphery of the operating handle 5, and is electrically connected to the lead wire 20'' of the resistor 17 inserted in the hole 6. It comes into contact with and separates from the fixed terminal plate 9 in accordance with the operation of the handle 5. In the figure, 37 is a release button, and 38 is a driver insertion hole. FIG. 5 is a perspective view showing a state in which the resistor 17 is locked with molded protrusions 25, 25, 25 in one embodiment. It should be noted that the resistor 17 can be locked by not only the three molded protrusions 25, 25, 25 in the above embodiment, but also by the sixth molded protrusion, for example.
The resistor 17 may be press-fitted between the molded rib bodies 39, 39 parallel to FIGS. 39 in the diagram
a is a recess into which the resistor 17 is fitted. Further, as shown in FIG. 8, a part of the metal lead plate 21 inserted into the molded board 22 is used to form a holding piece 21a, and the holding piece 21a and the molded rib body 40 hold the resistor 17 at both ends. It may also be locked from. Figure 9 shows the molded rib body 40 of Figure 8.
An embodiment is shown in which the holding piece 21a and the holding piece 21a are placed on opposite sides. Further, as shown in FIG. 10, the molded rib body 37 is not used and the metal lead plate 21 is used to hold the parallel presser pieces 21a, 21.
a' may be formed, and the resistor 17 may be locked between the holding pieces 21a and 21a'. Furthermore, as shown in FIG. 11, a part of the metal lead plate 21 may be curled, and the resistor 17 may be inserted into the curled portion 21b and locked therein. Furthermore, as shown in FIGS. 12a and 12b, molded projections 41, 41, 41 having an arc-shaped cross section are protruded on the same circumference so as to have a cylindrical shape, and these molded projections 41, 4
The resistor 17 may be press-fitted into the space surrounded by 1 and 41 and locked therein.

【Effect of the invention】

As described above, the present invention provides a hole approximately in the center for inserting a rib provided on the back of an operation handle that drives a movable contact body having a movable contact that can freely contact and release from a fixed contact in the reverse direction, and A molded rib base for receiving a display element is integrally provided on the surface of a molded substrate with a metal lead plate embedded therein, and a locking means for locking and holding a resistor is provided protruding from the surface of the molded substrate, and the side of the molded substrate is A terminal for caulking and fixing one end of one of the lead wires of the resistor, and a pair of terminals for caulking and fixing one end of both lead wires of the display element, respectively, are provided by protruding a part of the metal lead plate. A display element and a resistor are connected in series via a metal lead plate, and the other lead wire of the resistor, which is one end of the series circuit, is electrically connected to the movable contact body, and the other end of the series circuit is connected in series. The end is connected to a contact section provided on the back surface of the molded substrate, and the contact section is brought into contact with the fixed terminal board provided with the fixed contact when the operation handle is turned off, so that the display element and The placement position of the resistor can be determined by the molded rib base and the locking means, and the display element can be secured to the molded rib base and the resistor can be secured by the locking means, so the lead wire can be protected against vibration. This has the effect of preventing wire breakage, resulting in high reliability even when incorporated into a switch.Furthermore, since the metal lead plate for the electrical circuit is embedded within the molded base, it can be incorporated into the switch to open and close the contacts. Even when the wires are connected to each other, unlike printed circuit boards, the electrical circuits are not exposed, so they are not affected by arcs at all, and this has the excellent effect of increasing reliability. It has the advantage of being easier to position and easier to assemble than those that are joined together, making it ideal for automatic assembly.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a switch using a conventional example, Figures 2 a and b are front and side views of the conventional example, and Figure 3 a
~c is a top view and a front view of the molded substrate portion of the present invention,
4 is a sectional view of a switch using an embodiment of the present invention, 5 is a perspective view of the main parts of the same, and 6 The figure is a perspective view of a main part of another embodiment of the present invention, FIG. 7 is a front view of the same as above, and FIG. 8 is a perspective view of a main part of another embodiment of the present invention.
9 is a perspective view of a main part of a modification example same as the above, FIG. 10 is a perspective view of a main part of another embodiment of the present invention, and FIG. 11 is a perspective view of a main part of still another embodiment of the present invention. 12a and 12b are a top view and a perspective view of main parts of yet another embodiment, in which 5 is an operating handle, 15 is a display element, 17 is a resistor, 20', 20'' are lead wires,
21 is a metal lead plate, 22 is a molded substrate, 24 is a molded rib base, 25 is a molded protrusion, 26 is a terminal, 27 is a lead wire, and 28 is a terminal.

Claims (1)

[Claims] 1. A hole is provided approximately in the center for inserting a rib provided on the back of the operating handle that reversely drives a movable contact body having a movable contact that can be freely contacted and released from a fixed contact, and a metal lead plate for the electric circuit is installed inside. A molded rib base for receiving the display element is integrally provided on the surface of the embedded molded substrate, and a locking means for locking and holding the resistor is provided protrudingly on the surface of the molded substrate, and the resistor is attached to the side of the molded substrate. A terminal for caulking and fixing one end of one lead wire of the display element, and a pair of terminals for caulking and fixing one end of both lead wires of the display element, respectively, are provided by protruding a part of the metal lead plate to connect the display element and the resistor. The other lead wire of the resistor, which is one end of the series circuit, is electrically connected to the movable contact body, and the other end of the series circuit is connected in series through a metal lead plate. A display circuit block with a built-in switch connected to the contacts provided on the back side.