JPH08129921A - Switch device - Google Patents

Abstract

PURPOSE: To prevent a movable contact from being brought in contact with both mutually adjacent fixed contacts, by deviating the positions of the fixed contacts for switching the contact by the movable contact in relation to the position where a click piece is stabilized. CONSTITUTION: When an operating lever 27 is rotatably operated from a switch case 21, a movable contact switch 29 is moved so as to sequentially bring a contact part 32 in contact with to fixed contacts 23 to 26 in this order or in the reverse order while bring contact parts 30, 31 in contact with the fixed contacts 22, 23. At this time, the click piece 35 passes over click mountains 40 to 43 and engaged with respective click valleys 36 to 39, so as to hold respective contact positions of the switch 29. The contacts 23 to 26 are provided by deviating their positions from one another, so that the contact part 32 may not brought in contact with both mutually adjacent contacts in the stabilized position on the click mountains 40 to 43, particularly, so that the contact degree of the contact to which much current is allowed to flow may be sufficient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device having a moderation mechanism.

[0002]

2. Description of the Related Art Conventionally, for example, in an air flow rate changeover switch device used for air conditioning in an automobile, FIG.
The operation lever 1 is provided as shown in FIG. 2, and the movable contact 2 is moved by the operation lever 1 as shown in FIG. 9 to provide a plurality of (four in the illustrated example) fixed contacts 3, 4, 5, 6 Is selectively brought into contact therewith, so that a desired air volume can be obtained.

Further, in this structure, a plurality of moderation valleys 7, 8, 9 and 10 are formed corresponding to the contact positions of the movable contact 2 with respect to the fixed contacts 3 to 6, respectively.
12, 13, 14 are alternately provided, and a moderation piece 15 is elastically biased by a compression spring 16 on the operation lever 1, and the moderation piece 15 operates the operation lever 1 for moving the movable contact 2. In order to hold the movable contact 2 and the operation lever 1 at the respective contact positions of the movable contact 2 with respect to the fixed contacts 3 to 6 by sequentially passing over the moderation peaks 11 to 14 and engaging the respective moderation valleys 7 to 10. Has become.

[0004]

In the case of the above, the moderation piece 15 is stable when engaged in each of the moderation valleys 7 to 10, but reaches the vicinity of each apex of the moderation peaks 11 to 14 in contact with the moderation peaks 11 to 14. Sometimes it is stable due to mechanical balance. Then, the position where the moderation piece 15 is in contact with the moderation ridges 11 to 14 and becomes stable coincides with the position between the fixed contacts 3 to 6 at which the movable contact 2 switches the contact. Therefore, in FIG. As shown in the drawing, the contact portion 17 of the movable contact 2 may be stable at a position where the contact portion 17 of the movable contact 2 straddles between two adjacent fixed contacts (4,5 in the illustrated example) and contacts both of them. In this case, even if mechanically stable, it is conceivable that the contact degree of either one of the contacts, especially the contact through which a large amount of current flows, may be insufficient.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to provide a movable contact between two adjacent fixed contacts at a position where the moderation piece comes into contact with the moderation mountain and is stable. It is to provide a switch device capable of avoiding contact with both of them.

[0006]

In order to achieve the above object, in a switch device of the present invention, an operating lever,
A movable contact that is moved by the operation lever, a plurality of fixed contacts that the movable contact selectively contacts due to the movement, and a plurality of moderation valleys that are provided corresponding to respective contact positions of the movable contact with respect to the fixed contact, and A moderation piece located between the moderation valleys and a moderation piece which is elastically biased to the operation lever and moves the movable contact to sequentially move over the moderation peaks and engage with each moderation valley in response to the operation of the operation lever. And a position between the fixed contacts at which the movable contact switches the contact is shifted with respect to a position at which the moderation piece comes into contact with the moderation mountain and stabilizes.

[0007]

According to the above means, the position between the fixed contacts where the movable contact switches the contact is not aligned with the position where the moderation piece is in contact with the moderation peak and is stable, and thus the moderation piece is stable in contact with the moderation peak. In this position, the movable contact is prevented from straddling between two adjacent fixed contacts and coming into contact with both of them.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an air conditioner air volume changeover switch device for an automobile will be described with reference to FIGS. First, FIG. 1 shows a switch case 21, and a plurality of switch cases (in the example shown in FIG.
Individual fixed contacts 22, 23, 24, 25, 26 are provided.

Further, the switch case 21 has an operating lever 2
7 is pivotally supported by a support shaft 28 so as to be rotatable in the left-right direction in the drawing, and a movable contact 29 is integrally provided on the operation lever 27. Therefore, the movable contact 29 moves in an arc shape in the left-right direction in the drawing by the rotation of the operation lever 27, and by the movement, the fixed contacts 22 and 23.
In addition to the contact portions 30 and 31 that keep contacting with each other, the contact portion 32 that switches the contact in the order of the fixed contacts 23, 24, 25 and 26 or vice versa.

Further, a hole 33 is formed in the operation lever 27 at a position ahead of the movable contact 29, and a compression spring 34 as an elastic body accommodated in the hole 33 elastically biases a spherical moderation piece 35. . On the other hand, on the other hand, the cover (not shown) of the switch case 21 has movable contacts 2 for the fixed contacts 23 to 26.
Corresponding to each contact position of 9, a plurality of moderation valleys 36, 37,
38 and 39 are provided alternately with moderation peaks 40, 41, 42 and 43.

Therefore, in this structure, when the operation lever 27 is rotated from the outside of the switch case 21, the movable contact 29 moves to bring the contact portions 30 and 31 into contact with the fixed contacts 22 and 23, and at the same time, to the contact portion. 32 is sequentially contacted with the fixed contacts 23, 24, 25, 26 or vice versa (selective contact) to obtain desired air volume for air conditioning in the vehicle, for example, "off", "weak",
Obtained in the order of "Medium" and "Strong". Further, in this case, in accordance with the operation of the operation lever 27, the moderation piece 35 sequentially crosses the moderation ridges 40 to 43 and engages with the moderation valleys 36 to 39, thereby moving the movable contact 29 and the operation lever 27 to the fixed contact 23. To each contact position of the movable contact 29 with respect to 26 (FIG. 2 shows that the movable contact 29 brings the contact portion 32 into contact with the fixed contact 25, and the moderation piece 35 engages with the moderation valley 38 to retain the contact. Represents the state).

The moderation piece 35 is composed of moderation valleys 36 to 39.
Stable when engaged with each of the
It is the same as the conventional one that it is stable even when it comes in contact with 0 to 43 and reaches the vicinity of each apex. FIG. 3A shows this, and the operating load of the operating lever 27 shown along the vertical axis is, as shown by the curve A, when the moderation piece 35 goes up from one moderation valley to the adjacent moderation peak. It gradually increases and reaches its maximum just before reaching the summit of Moderation Mountain, and stabilizes due to mechanical balance. However, since the inclination of the slope of the moderation mountain becomes gentle at the top of the moderation mountain, the operation load of the operation lever 27 decreases, and thereafter, when the moderation piece 35 descends the moderation mountain, it is rapidly reduced, and the valley bottom part of the moderation valley. Immediately before reaching, the slope increases at the part where the slope becomes gentle and becomes null at the bottom of the valley and stabilizes. Curve B is the control lever 27
Shows the change in the operating load when moving in the opposite direction.
It has a hysteresis characteristic with respect to the curve A.

In the figure, C and D are moderation pieces 35.
Indicate the positions where the contact points 40 to 43 are in contact with the moderation ridges 40 to 43 and are deviated from the front and rear positions thereof, respectively, and the position where the movable contact 29 switches the contact (the position between the fixed contacts 23 to 26). ) Is (b) in the figure.
The area C is set as shown in FIG. 2 or the area D is set as shown in FIG.

FIG. 4 shows a specific structure of the movable contact 29, in which the position where the movable contact 29 switches the contact is set in the region C, in the relationship between the fixed contacts 24 and 25. A convex portion 25a is formed on the fixed contact 25, and the position between the fixed contacts 24 and 25 (the position where the movable contact 29 switches the contact) is displaced from the position where the moderation piece 35 contacts the moderation crest 42 and is stable. There is.

On the other hand, FIG. 5 shows a specific structure of the movable contact 29 in which the contact switching position is set in the region D in the relationship between the fixed contacts 24 and 25.
A convex portion 24b is formed on the fixed contact 24, and a concave portion 25b is formed on the fixed contact 25, and the moderation piece 35 sets the position between the fixed contacts 24 and 25 (the position where the movable contact 29 switches the contact). It touches 42 and is displaced from the stable position.

According to this structure, the positions between the fixed contacts 23 to 26 at which the movable contact 29 switches the contact are aligned with the positions at which the moderation piece 35 comes into contact with the moderation ridges 40 to 43 and becomes stable. Therefore, at the position where the moderation piece 35 is in contact with the moderation peaks 40 to 43 and is stable, the movable contact 29 is prevented from straddling between two adjacent fixed contacts and coming into contact with both of them. Specifically, in the configuration shown in FIG. 4, the movable contact 29 contacts only the fixed contact 25 (the convex portion 25a) as shown in FIG. 6, and in the configuration shown in FIG. As shown in, the movable contact 29 only contacts the fixed contact 24 (the convex portion 24b). Therefore, it is possible to prevent the contact degree of the contact having a large amount of current from becoming insufficient.

The present invention is not limited to the air conditioner air flow rate changeover switch device in the interior of an automobile, but can be widely applied and implemented as a switch device for other devices.

[0018]

As is clear from the above description, in the switch device of the present invention, the position between the fixed contacts at which the movable contact switches the contact is displaced from the position at which the moderation piece comes into contact with the moderation peak and is stabilized. The feature is that the movable contact straddles two adjacent fixed contacts and contacts both of them at a position where the moderation piece is in contact with the moderation mountain and is stable. This can be avoided, and it is possible to prevent the contact degree of the contact having a large amount of current from being insufficient.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is an overall front view in a different state.

FIG. 3 is a characteristic explanatory diagram.

FIG. 4 is a front view of a part of a fixed contact portion.

FIG. 5 is a front view showing a different form of some fixed contact portions.

FIG. 6 is a partial front view for explaining the operation.

FIG. 7 is a partial front view for explaining an operation in a different form.

FIG. 8 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 9 is a view corresponding to FIG.

FIG. 10 is a view equivalent to FIGS.

[Explanation of symbols]

Reference numerals 23 to 26 are fixed contacts, 24a is a concave portion, 24b is a convex portion, 25a is a convex portion, 25b is a concave portion, 27 is an operating lever, 29 is a movable contact, 32 is a contact portion, 34 is a compression spring, 35 is a moderation piece, 36 to 39 are moderation valleys,
40-43 show the moderation mountain.

Claims (1)

[Claims] 1. An operating lever, a movable contact that is moved by the operating lever, a plurality of fixed contacts that the movable contact makes selective contact by the movement, and a contact position of the movable contact with respect to the fixed contact. A plurality of moderation valleys provided and a moderation crest located between the moderation valleys, and the moderation peaks are sequentially crossed in accordance with the operation of the operation lever that elastically biases the operation lever and moves the movable contact. And a moderation piece engaging with each moderation valley, wherein the movable contact is provided so as to shift the position between the fixed contacts for switching the contact with respect to a position where the moderation piece is in contact with the moderation peak and is stable. Characteristic switch device.