JPH052332U - Movable contact plate mounting structure of 3-contact type switch - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the ease of assembly of the movable contact plate and improve the ease of assembly. [Structure] The movable contact plate 21 has contacts 22a, 2 at three locations.
2b and 22c. On the line connecting the center G of weight and the center C of contact pressure of the movable contact plate 21, a narrow guide leg 23a is provided on the side of the center G of weight, and a wide guide leg 2 is provided on the side of the center C of contact pressure.
3b are provided respectively. The guide leg portions 23a and 23b are slidably engaged with the engagement groove portions 18a and 18b of the slider 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a movable contact plate mounting structure for a three-contact switch used for a fan switch of an automobile.

[0002]

[Prior Art]

 Conventionally, for example, a fan switch of an automobile is provided with a slider 30 which is slid by a lever as shown in FIG. 3, and a movable contact plate 33 is mounted on a coil spring 32 housed in a recess 31 of the slider 30. Is attached. The movable contact plate 33 has movable contacts 34a, 34b, 34c at three locations as shown in FIG. The movable contact plate 33 is urged toward the fixed contact by the coil spring 32 that abuts on the back surface of the contact pressure center C so that these contacts uniformly contact the fixed contact (not shown). The contact pressure center C is a centroid of a triangle connecting the movable contacts 34a, 34b, 34c.

[0003]

[Problems to be solved by the device]

 However, since the movable contact plate 33 has a different center of gravity G and center of contact pressure C due to plate cutting and the position of the contact point, as shown in FIG. There was a problem that it was difficult to sit and it was difficult to install. It is an object of the present invention to solve such a problem, and an object of the present invention is to provide a movable contact plate mounting structure for a three-contact switch in which the movable contact plate is well seated and easy to assemble.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention attaches a movable contact plate having contacts at three points to a slider, and a coil spring is brought into contact with the center of contact pressure of each contact to bring the movable contact plate to the fixed contact side of the base. In the mounting structure of the movable contact plate that is biased, on the line connecting the center of gravity of the movable contact plate and the center of contact pressure, a narrow guide leg is located on the center of weight side and a wide guide leg is located on the center side of contact pressure. Each of the guide legs is provided, and each guide leg is slidably engaged with the engagement groove of the slider.

[0005]

[Action]

 According to the above-mentioned structure, the movable contact plate includes the narrow guide leg portion provided on the weight center side and the wide guide leg portion provided on the contact pressure center side as a whole including these guide leg portions. The center of weight of is coincident with the center of contact pressure. Therefore, the movable contact plate is placed on the coil spring and sits comfortably.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a fan switch of an automobile having a movable contact plate mounting structure according to the present invention. This fan switch includes a terminal base 1, a case 2, a lever 3, and a slider 4. A terminal plate (not shown) serving as a fixed contact is provided on the inner surface of the terminal base 1 by insert molding. Two claws 5 that engage with engagement holes 11 of a case 2 to be described later are provided on each of both end surfaces of the terminal base 1.

The case 2 has a substantially rectangular box shape that is covered by the terminal base 1, and has a slit (not shown) horizontally formed in one end wall thereof so that the lever 3 described later can be inserted through the slit. It has become. Further, an arc-shaped guide groove 7 is formed in the protruding portion 6 provided above the slit. A lever mounting seat 8 is provided on the inner surface of the bottom of the case 2 so as to project. Further, the inner surface of the other end wall of the case 2 on the side opposite to the slit is curved outward as a whole, and the positioning grooves 9 are formed at predetermined intervals, and the positioning groove 9 is formed. There is a mountain portion 10 that curves inward between the two. Elastic protrusions 12 having engaging holes 11 are provided on the outer surfaces of both side walls of the case 2.

A long hole 13 is formed at one end of the lever 3, an operation knob (not shown) is attached to the other end, and a guide protrusion 14 is provided in the middle. The slider 4 has at one end a sliding groove 15 with which the tip of the lever 3 is slidably engaged in the longitudinal direction, and at the other end, an action spring 17 for urging the ball 16 outward is accommodated. A spring accommodating hole (not shown) is formed. Further, a narrow engaging groove portion 18a is formed on one side surface of the slider 4 near the spring accommodating hole, and a wide engaging groove portion 18b is formed on the other side surface. Further, a spring accommodating recess 20 for accommodating the coil spring 19 for supporting the movable contact plate 21 and biasing the movable contact plate 21 upward is formed on the upper surface between the engaging groove portions 18a, 18b. ..

As shown in FIG. 2, the movable contact plate 21 has a substantially isosceles triangular shape having contacts 22a, 22b, 22c at three positions. The plate itself has a contact pressure center C as described above. And the center of gravity G ′ do not match. However, a narrow guide leg 23a is formed at the bottom of the weight center G ', and a wide guide leg 23b is formed at the apex of the contact center C by bending. The weight center G of the movable contact plate 21 including the guide leg portions 23a and 23b moves to the apex side and coincides with the contact pressure center C.

Assembling of the fan switch having the above configuration is performed as follows. First, the tip of the lever 3 on the elongated hole 13 side is inserted into the case 2 through a slit (not shown) of the case 2, and the guide protrusion 14 is fitted into the guide groove 7 of the case 2 via the spring 25 and the washer 26. Then, a mounting screw 28 is inserted into the long hole 13 of the lever 3 via a washer 27, and the mounting screw 28 is fastened to the lever mounting seat 8.

Next, the action spring 17 and the ball 16 are inserted into a spring accommodating hole (not shown) of the slider 4, the slider 4 is accommodated in the case 4, and the sliding groove 15 is engaged with the tip of the lever 3. Let Then, the coil spring 19 is accommodated in the spring accommodating recess 20 of the slider 4, the movable contact plate 21 is placed on the coil spring 19, and the guide leg portions 23a and 23b thereof are respectively engaged with the engaging groove portions 18a of the slider 4. , 18b. At this time, since the contact pressure center C and the weight center G coincide with each other as described above, the movable contact plate 21 is placed on the coil spring 19 without tilting. Further, since the guide leg portions 24a and 24b are engaged only with the engaging groove portions 18a and 18b having the widths corresponding to the respective widths, the guide leg portions 24a and 24b cannot be mounted in the opposite direction, and misassembly is prevented.

After mounting the movable contact plate 21 on the slider 4 in this manner, the terminal base 1 is put on the case 2, and the claws 5 thereof are engaged with the engaging holes 11 of the case 2 to be attached. As a result, the contacts 22a, 22b, 22c of the movable contact plate 21 are pressed against the fixed contacts (not shown) on the inner surface of the terminal base 1 by the biasing force of the coil spring 19. In the fan switch thus assembled, if the knob (not shown) at the tip of the lever 3 is operated in the left-right direction, the lever 3 rotates about the elongated hole 13, but the guide protrusion 14 forms the arc shape of the case 2. Since it slides along the guide groove 7 of, the knob of the lever 3 moves linearly.

As the lever 3 is rotated, the slider 4 also rotates around the elongated hole 13 of the lever 3, and as a result, the contacts 22 a, 22 b, 22 c of the movable contact plate 21 are provided on other terminals (not shown) of the terminal base 1. The fixed contact is contacted to switch the contact. Further, the rotational position of the slider 4 is positioned by the ball 16 at the tip of the slider 4 getting over the mountain portion 10 of the case 2 and engaging with the positioning groove 9.

[0014]

[Effect of the device]

 As is clear from the above description, according to the present invention, the narrow guide leg and the wide guide leg balance the weight, the center of weight and the center of contact pressure coincide, and the guide legs are Since the part engages with the engaging groove part, the movable contact plate is placed on the coil spring and can be easily attached to the slider. In addition, since the guide leg portions have different width dimensions and engage only with the corresponding engaging groove portions, there is an effect that erroneous assembly can be prevented.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a fan switch having a movable contact plate mounting structure according to the present invention.

FIG. 2 is a plan view of a movable contact plate.

FIG. 3 is a partially cutaway side view showing an assembled state of a conventional movable contact plate.

FIG. 4 is a perspective view of a conventional movable contact plate.

[Explanation of symbols]

1 ... Terminal base, 4 ... Slider, 18a, 18b
... Engagement groove part, 19 ... Coil spring, 21 ... Movable contact plate, 22a, 22b, 22c ... Contact point, 23a, 23b ...
Guide leg.

Claims (1)

[Claims for utility model registration] [Claim 1] A movable contact plate having contacts at three points is attached to a slider, and a coil spring is brought into contact with the contact pressure center of each contact to fix the movable contact plate to the fixed contact side of the base. In the structure for mounting the movable contact plate of the three-contact type switch that is biased to, the narrow guide leg on the line connecting the center of gravity of the movable contact plate and the center of contact pressure A movable contact plate mounting structure for a three-contact switch, characterized in that wide guide legs are provided on respective sides, and each guide leg is slidably engaged with an engagement groove of a slider.