CN1218337C - Microswitch - Google Patents

Abstract

To reduce man hour of wiring and connection and aim at space saving in a micro switch to which a diode is connected.Into concave parts 14, 15 formed in a common terminal2 and terminal fittings 8, a lead terminal 13a of the diode 13 is press-fitted, and by putting a notch or crushing in the vicinity of concave parts 14, 15 and by calking, the diode 13 is made to be built in a micro switch 1.

Description

Micro switch and manufacturing method thereof

                    

The present invention relates to a micro switch capable of switching contacts in a snap action and a manufacturing method thereof.

Background technique

For a long time, in order to prevent noise caused by vibration, etc., diodes are often connected to micro switches. This type of diode is welded on the circuit board by soldering, and the micro switch is connected with a wire between the circuit board on which the diode is installed. .

In this prior art example, the diode needs to be welded on the circuit board by soldering method, and must carry out detour wiring with long wire between the micro switch and the circuit board, therefore, there is the need for wiring and connection. The number of man-hours is many, and the difficulty of increasing the wiring space.

Contents of the invention

The present invention has been developed in view of these difficulties, and the purpose is to reduce the number of man-hours required for wiring and connection of microswitches to which diodes are connected, and to save space.

In order to achieve the above objects, the present invention is constructed as follows.

That is, the microswitch of the present invention has built-in diodes, and at the same time, the terminals of the diodes are pressed into the recesses formed on the circuit terminals of the microswitch and connected, and the circuit terminals near the recesses are formed with cutouts, so that the concave portion deforms closely along the terminals of the diode.

Here, the term "circuit terminal" includes not only a common terminal, a normally open terminal, or a normally closed terminal of the microswitch, but also a portion serving as a circuit terminal such as a terminal component inside the microswitch. In addition, the recessed portion may be recessed in a groove shape or other shapes as long as it is recessed so that the diode terminal can be pressed in.

According to the present invention, since the diode is built into the micro switch, it is not necessary to weld the diode on the circuit board by soldering as in the prior art example, and at the same time, no circuitous wiring is required, and since the terminals of the diode are pressed into And connected to the recess formed on the circuit terminal of the micro switch, therefore, the connection between the diode and the micro switch can be easily completed.

According to the present invention, the concave portion is deformed along the shape of the terminal pressed into the concave portion, that is, crimped, so that connection reliability can be ensured.

In other preferred embodiments of the present invention, the circuit terminal near the concave portion is crushed, so that the concave portion deforms along the terminal of the diode and fits tightly.

According to the present invention, the concave portion is deformed along the shape of the terminal pressed into the concave portion, that is, crimped, so that connection reliability can be ensured.

Description of drawings

Fig. 1A, Fig. 1B, Fig. 1C are the figures that represent microswitch appearance of the present invention;

Fig. 2A, Fig. 2B are the longitudinal sectional front view and the figure of terminal part of the microswitch of Fig. 1A, Fig. 1B, Fig. 1C;

Fig. 3A, Fig. 3B are the figures that represent the detail of part A of Fig. 1A, Fig. 1B, Fig. 1C;

Fig. 4 is a diagram showing caulking after pressing the diode;

Fig. 5 is a diagram showing caulking in another embodiment of the present invention;

FIG. 6 is a diagram illustrating the caulking process in FIG. 5 in detail.

Detailed ways

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

Fig. 1A, Fig. 1B, Fig. 1C are the figures that represent the appearance of the microswitch of one embodiment of the present invention, Fig. 1A is a plan view; Fig. 1B is a front view; Fig. 1C is a side view, and Fig. 2A, Fig. 2B are its longitudinal section front view and As a side view of the terminal portion, FIGS. 3A and 3B are views showing details of part A of FIGS. 2A and 2B .

The micro switch 1 is a normally closed two-terminal switch in which a common terminal 2 and a normally closed terminal 3 protrude from the side of the housing, and a connector type micro switch in which the terminals 2 and 3 are shaped like connectors.

The micro switch 1 includes a main body housing 5 equipped with a snap-action switch mechanism 4 and a resin cover 6 fitted and connected to the main body housing 5. By pressing and operating the operation buttons 7 provided on the housings 5 and 6, the switch can be switched. The contacts of the switch mechanism 4 and make it actuate. A mounting hole 21 is provided below the operation button 7 for mounting the micro switch 1 on a predetermined position.

The switch mechanism 4, as shown in FIG. 2A and FIG. 2B, is composed of the above-mentioned terminals 2 and 3 equipped on the main body casing 5, a common terminal part 8, a movable piece 9 for contact switching, and the movable piece 9 The curved spring piece 10 that moves up and down quickly is formed. The base end of the movable piece 9 is fastened and supported on the fastened piece 8a provided on the terminal part 8 through the V-shaped fastening groove 11. The curved spring piece The base end of 10 is buckled and supported on another buckling piece 8b on the third fixed terminal 8 through the V-shaped buckling groove 12, and at the same time, the free end of the curved spring piece 10 is buckled and supported on the movable piece 9. on the free end side.

The operation button 7 is slidably mounted on the upper surface of the casing 5 so as to contact and act on the middle part of the movable piece 9 from above.

Although the common terminal 2 and the terminal part 8 of the prior art microswitch are integrally formed, the microswitch of this embodiment has a diode 13 built in to prevent noise caused by vibration, and is conveniently constructed as follows: The diode 13 can be installed between the common terminal 2 and the terminal part 8 as a circuit terminal.

That is, the common terminal 2 and the terminal part 8 are respectively bent downward relative to each other in the vicinity of the center in the longitudinal direction of the main body case 5, and the two lead terminals 13a of the diode 13 are pressed into and held in the bent portions 2a, 8c, respectively. At the same time, recesses 14, 15 for electrical connection are also formed respectively. In the recesses 14, 15, tapered guide surfaces 14a for guiding the lead terminals 13a of the diode 13 are respectively formed, and the recesses 14, 15 are made into a substantially Y shape Grooved.

As described above, since the tapered guide surfaces 14a are formed in the recesses 14, 15, the lead terminals 13a of the diode 13 can be smoothly pressed in along the guide surfaces 14a, thereby enabling automatic press-fitting.

Moreover, as shown in the sectional view of FIG. 3B viewed from the sectional line X-X' of FIG. 3A, in the main body case 5, a limiter 16 is formed to limit the press-in position of the lead terminal 13a, so that when the diode 13 is pressed in, the diode 13 is enclosed. The glass tube part of the element of the diode 13 will not contact the main body case 5 and be damaged.

Moreover, in this embodiment, in order to improve the contact reliability of the diode 13 pressed into the recesses 14, 15 of the common terminal 2 and the terminal part 8, after the lead terminal 13a of the diode 13 is pressed, as shown in FIG. 2 and near the recesses 14, 15 of the terminal part 8, use a special tool 17 with a sharp front end to form a cutout 18, so that the recesses 14, 15 are deformed along the shape of the lead terminal 13a of the diode 13 and closely attached, thereby improving the caulking strength. This ensures electrical continuity even when subjected to vibration and shock.

With the micro switch 1 of the above structure, as shown in Fig. 2A and Fig. 2B, in the normal state where the operation button 7 is not subjected to external force, the elastic restoring force of the curved spring piece 10 pushes the free end side of the movable piece 9 upward. , Make it displace, make the movable contact 9a on the free end of the movable piece 9 contact and hold the normally closed contact 3a of the normally closed terminal 3, and make the common terminal 2 and the normally closed terminal 3 become conduction state. Then, when the operation button 7 is pushed in and the middle part of the movable piece 9 is bent downward and displaced more than a set amount, the elastic restoring force of the curved spring piece 10 pushes the movable piece 9 downward so that it Displacement, the contact is disconnected after instantaneous reversal. In addition, once the push-in of the operation button 7 is released, the middle part of the movable piece 9 returns to rise, and then the elastic restoring force of the curved spring piece 10 pushes the movable piece 9 upward to displace it, and returns to the original position after being reversed. state.

The microswitch 1 having the above-mentioned structure is manufactured in the following procedure.

First, attach the movable piece 9 and the bent spring piece 10 to the terminal part 8 and put them into the main body case 5, then, after putting the common terminal 2 into the main body case 5, press and hold the diode 13 in the common terminal 2 and the terminal part 8, as mentioned above, use the special tool 17 to caulk, after the normally closed terminal 3 is installed in the main body casing 5, insert the operation button 7, and the cover 6 is fitted and connected to the main body casing 5, and then the end is completed.

In addition, in other embodiments of the present invention, as shown in FIG. 5 , a crimping tool 19 with a blunt front end can also be used to form a crushing portion 20 near the recesses 14, 15 of the common terminal 2 and the terminal part 8, so that the recess 14 , 15 are deformed along the shape of the lead terminal 13a of the diode 13 and closely attached to improve the caulking strength.

More detailed description is as follows, as shown in FIG. 6, the caulking tool 19 is pressed against the position 0.2mm to 0.3mm away from the recesses 14, 15 where the diode terminals 13a are inserted, and faces in the same direction as the grooves of the recesses 14, 15. Press the caulking tool 19 in the direction. Then, the terminal fitting 8 plugs the recesses 14, 15 and deforms to fix the diode terminal 13a.

Here, if the distance between the caulking tool and the recesses 14 and 15 is much greater than 0.3 mm, the entire terminal part 8 will be greatly deformed by the pressing of the caulking tool. On the other hand, if the caulking tool is close to the recesses 14 and 15 at a distance closer than 0.2 mm, the terminal parts 8 will be deformed after being pressed, and the thickness of the recesses 14 and 15 will be insufficient, and the diode terminal 13a will not work well. fixed.

To prevent both of these undesirable situations, it is important that the caulking tool fits snugly.

In the above-mentioned embodiment, although it is used for the microswitch having only the normally closed type fixed terminal, it can also be applied to the three-terminal microswitch which has the normally closed type fixed terminal and the normally open type fixed terminal.

Furthermore, in the above-mentioned embodiment, although it is used for a microswitch having connector-shaped terminals, the present invention can also be applied to a microswitch having soldered lead terminals.

According to the above-mentioned present invention, the terminals of the diodes are pressed into the recesses formed on the circuit terminals of the microswitch. Since the diodes are installed in the microswitches, it is not necessary to weld the diodes to the circuit by soldering as in the prior art. By routing wires on the board and connecting the micro switch to the circuit board, the number of man-hours required for wiring and connection can be reduced, and space can also be saved.

In addition, the caulking strength is improved by forming cuts or crushing near the fixed terminals, so that connection reliability can be ensured even when subjected to vibrations and shocks.

Claims (6)

1. microswitch, it is characterized in that, in diode is housed, and the terminal of described diode is pressed into and is connected in the recess that forms on the circuit terminal of this microswitch, on near the described circuit terminal the described recess, be formed with otch, described recess is adjacent to along the terminal distortion of described diode.

2. microswitch as claimed in claim 1 is characterized in that, with near the described circuit terminal conquassation the described recess, the terminal distortion of described recess along described diode is adjacent to.

3. microswitch as claimed in claim 2 is characterized in that, will be apart from the position conquassation of the described recess 0.2mm to 0.3mm of described circuit terminal.

4. the manufacture method of the microswitch of dress diode in a kind comprises the steps:

The terminal of diode is pressed in the recess on the circuit terminal of microswitch;

On near the described circuit terminal the described recess, form otch, described recess is adjacent to along the terminal distortion of described diode.

5. the manufacture method of the microswitch of dress diode in a kind comprises the steps:

The terminal of diode is pressed in the recess on the circuit terminal of microswitch;

Near the described recess of conquassation described circuit terminal makes described recess be adjacent to along the terminal distortion of described diode.

6. the manufacture method of the microswitch of dress diode in as claimed in claim 5, it is characterized in that: the step of the described circuit terminal of conquassation, be with caulking tool by the distance position of described recess 0.2mm to 0.3mm on and push, block described recess after the described circuit terminal distortion, fix the described diode terminal of inserting in the described recess like this.

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