JP2016058271A - Switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switching device capable of reliably performing slide switching between a movable contact and a stationary contact.SOLUTION: When an operation body 50 is pushed, an operation conductor plate 30 is rotated by the operation body 50. A rotational force is given through two tensile coil springs 41 and 42 to an independent conductor plate 23 of a switching movable part 20, and the switching movable part 20 is rotated. The switching movable part 20 includes movable contacts 24, 25 and 26 and by a rotational operation of the switching movable part 20, the movable contacts 24, 25 and 26 are switched with sliding of sliding parts 17a, 17b and 17c. The two tensile coil springs 41 and 42 are adopted, thereby stabilizing an action of the switching movable part 20 and improving reliability of an electrification path.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a switching device in which a switching movable portion having a plurality of movable contacts and an operation conductor plate operated by an operating body are connected by a tension coil spring.

  Patent Document 1 describes an invention relating to a switch device in which a plurality of movable contacts are simultaneously operated by a pressing operation of one operation member.

  In the switch device, a first drive member having a plurality of movable contacts is supported on a base having a plurality of fixed contacts in a swingable manner with a fulcrum, and a second made of conductive metal. The drive member has a fulcrum and is swingably supported. The free end side of the first drive member and the free end side of the second drive member are connected by a single tension spring.

  When the free end side of the second drive member is pushed by the operating member, the second drive member swings toward the base, and the first drive member snaps by the biasing force of the tension spring along with the swing operation. Operates and swings. When the first drive member swings, the movable contact provided on the first drive member slides on the fixed contact provided on the base, and the conduction state of the contact is switched.

  The central movable contact provided on the first drive member is electrically connected to the second drive member via a tension spring, and the movable contact is connected to the base via the tension spring and the second drive member. It is electrically connected to the provided terminal portion.

JP 2012-64548 A

  The switch device described in Patent Document 1 can quickly perform sliding switching between a plurality of movable contacts and a plurality of fixed contacts by simultaneously operating a plurality of movable contacts by pressing the operation member. It is excellent in that it can be done. However, the following problems have not been solved.

  In the switch device described in Patent Document 1, the first drive member and the second drive member are connected by a single tension spring. Therefore, in order to operate the first drive member having a plurality of movable contacts quickly and reliably by swinging the second drive member, it is necessary to increase the spring constant of the tension spring. However, when the spring constant is increased, wear tends to occur at the latching portion between the tension spring and the first drive member and the latching portion between the tension spring and the second drive member. Since the tension spring also functions as an energizing path to the central movable contact, if the pressing operation by the operating member is repeated and the wear becomes severe, the reliability of the energizing path is impaired.

  In the switch device described in Patent Document 1, the contact portion between the movable contact and the fixed contact is located farther from the fulcrum of the first drive member than the latching portion between the tension spring and the first drive member. . For this reason, when the first drive member is swung by the tension spring, the driving force required to slide the movable contact and the fixed contact becomes large, and stable operation can be achieved unless the spring constant of the tension spring is increased considerably. It is difficult to ensure sex. As a result, the latching portion between the tension spring and each drive member is more likely to be worn.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a switching device capable of realizing stable operation and improving the reliability of energization through a tension coil spring.

  Another object of the present invention is to provide a switching device that can efficiently transmit the operating force when the operating body is pressed, thereby improving the reliability of the operation and reducing the operating load. Yes.

The present invention includes a base formed of an insulating material, a plurality of fixed conductors fixed to the base, a plurality of sliding portions formed on the base, a fixed contact provided on the sliding portion, In a switching device having a switching movable portion that supports a plurality of movable contacts that slide on each of the sliding portions, and an operation conductor plate that is operated by an operating body,
The switching movable portion is fixed to a movable insulator with a fulcrum conductor plate and an independent conductor plate separated from the fulcrum conductor plate, and the movable contact is provided on each of the fulcrum conductor plate and the independent conductor plate,
The switching movable portion is swingably supported with a contact portion between the fulcrum conductor plate and a part of the fixed conductor as a first fulcrum, and a base portion of the operation conductor plate is connected to another fixed conductor. The first fulcrum and the second fulcrum are arranged at positions spaced apart from each other with the abutting part supported as a second fulcrum, and the front end of the operation conductor plate is the first fulcrum. Located on the fulcrum side, the tip side can be pressed by the operating body,
A plurality of tension coil springs extending along a direction in which the first fulcrum and the second fulcrum face each other are provided, and one end of each of the tension coil springs is on the front side of the operation conductor plate. When the other end is hooked to the independent conductor plate and the operating conductor plate is swung by the operating body, the switching movable portion is moved along with the swinging motion. A snap action operation is performed by the urging force of the tension coil spring, and the movable contact slides on the sliding portion,
The operation conductor plate and the independent conductor plate are electrically connected via a plurality of the tension coil springs.

  In the switching device of the present invention, since a plurality of tension coil springs are hung between the independent conductor plate and the operation conductor plate provided in the switching movable portion, the operating force can be shared by the plurality of tension coil springs. it can. Therefore, the spring constant of each tension coil spring can be reduced, and the latching load at the latching part between the tension coil spring and the independent conductor plate and the latching part between the operation conductor plate can be reduced. Wear can also be reduced. Therefore, a plurality of parallel energization paths can be stably configured by the tension coil spring.

  In the switching device according to the present invention, the abutting portions between the sliding portion and the movable contact are arranged at intervals in a direction orthogonal to the direction in which the center line of the tension coil spring extends, and each tension coil The center line of the spring is located in the middle of the adjacent contact portions.

  For example, in the switching device of the present invention, in the switching movable portion, the fulcrum conductor plate is disposed on both sides of the independent conductor plate, and the tension coil spring is disposed between the fulcrum conductor plates.

  In the above configuration, the point of action of the driving force applied from the tension coil spring to the independent conductor plate is located in the middle of the plurality of contact portions where the movable contact and the slide portion slide, The load and the point of application of the biasing force of the tension coil spring can be arranged in a well-balanced manner. As a result, the switching movable part can be operated in a stable posture, and all the movable contacts can be simultaneously slid with respect to the sliding part.

  In the switching device according to the present invention, the movable contact and the sliding portion are in contact with each other between the latching portion (D1) of the tension coil spring and the independent conductor plate and the first fulcrum (S1). It is preferable that the part is located.

  Furthermore, in the switching device of the present invention, the distance (La) from the latching portion (D2) between the tension coil spring and the operation conductor plate to the second fulcrum (S2) is the same as the tension coil spring and the independent conductor. It is preferable that it is longer than the distance (Lb) from the latching portion (D1) to the plate to the first fulcrum (S1).

  In the switching device configured as described above, the operation conductor plate can be operated with a relatively light load, and the force transmission efficiency when operating the switching movable body with the tension coil spring is improved, and the movable contact is operated quickly. It becomes possible.

  Since the switching device of the present invention uses a plurality of tension coil springs, the switching movable body can be operated in a stable posture, and the reliability of the parallel current paths formed by the plurality of tension coils is improved. be able to.

  In addition, the switching device of the present invention can quickly and stably operate the plurality of movable contacts by the tension coil spring, and can further reduce the operation load when the operating body is pressed.

The perspective view which shows the external appearance of the switching apparatus of this invention, 1 is an exploded perspective view of the switching device shown in FIG. An exploded perspective view showing the main operating part of the switching device, FIG. 4 is an exploded perspective view showing only the conductive part of the main operating part shown in FIG. The side view which shows the state which the external force of the main operation | movement part shown in FIG. 3 is not acting, (A) is a side view with the base and the movable insulator removed, showing a state where no external force is acting, (B) is a schematic diagram showing the operating posture of each part at that time, (A) is a side view with the base and the movable insulator removed, showing a state in which the operating body is being pushed, (B) is a schematic diagram showing the operating posture of each part at that time, (A) is a side view in which the base and the movable insulator are removed, showing the timing when the contacts are switched, (B) is a schematic diagram showing the operating posture of each part at that time, (A) is a side view in which the base and the movable insulator are removed, showing a state where the operating body is completely pushed, (B) is a schematic diagram showing the operating posture of each part at that time, Explanatory drawing which shows the structure of the switching circuit of the switching apparatus of embodiment,

  FIG. 1 is an overall perspective view of a switching device 1 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In FIG. 2, the lid 3 is omitted.

  The switching device 1 switches a plurality of contacts simultaneously, and is used for an electronic circuit that requires high reliability, for example, for a vehicle.

<Structure of switching device>
As shown in FIGS. 1 and 2, the switching device 1 has a case 2 and a lid 3. The case 2 is formed of an insulating synthetic resin material, and has a rectangular parallelepiped shape having a bottom portion 2a and four side plate portions 2b and opened upward. The lid 3 is made of an insulating synthetic resin material, closes the opening of the case 2 and is fixed to the case 2 by means such as welding.

  3 and 4 show the main operating part of the switching device 1. FIG. 4 shows only the structure of an energization path formed of a conductive metal plate in the main operating part shown in FIG. Further, FIG. 10 shows a circuit diagram of a switching circuit constituted by each energization path.

  The bottom 2a of the case 2 shown in FIG. 2 has openings 2c formed at three locations, and the side bases 10a and 10b and the central base 10c are fixed to the respective openings 2c. The bases 10a, 10b, and 10c are made of an insulating synthetic resin material.

  As shown in FIGS. 2, 3, and 4, the side base 10a holds the first fixed conductor 11a, and the other side base 10b holds the first fixed conductor 11b. A terminal portion 11c is formed integrally with the first fixed conductor 11a, and the terminal portion 11c extends leftward from the side base 10a. A terminal portion 11d is also formed integrally with the first fixed conductor 11b, and the terminal portion 11d extends rightward from the side base 10b.

  The side base 10a holds the second fixed conductor 12a at a position spaced from the first fixed conductor 11a, and the terminal portion 12c integrated with the second fixed conductor 12a is connected to the side base 10a. It extends to the left. Similarly, a second fixed conductor 12b is also held on the side base 10b, and a terminal portion 12d integrated with the second fixed conductor 12b extends rightward from the side substrate 10b.

  An upper fixed contact 13a and a lower fixed contact 14a are held on the side base 10a with a space in the vertical direction. A terminal portion 13c is integrally formed with the upper fixed contact 13a, and a terminal portion 14c is integrally formed with the lower fixed contact 14a. The terminal portions 13c and 14c extend leftward from the side substrate 10a. An upper fixed contact 13b and a lower fixed contact 14b are held on the side substrate 10b. A terminal portion 13d is integrally formed with the upper fixed contact 13b, and a terminal portion 14d is integrally formed with the lower fixed contact 14b. The terminal portions 13d and 14d extend rightward from the side base body 10b. 3 and 4, the terminal portion 14d integral with the lower fixed contact 14b does not appear, and the terminal portion 14d is shown in the circuit diagram of FIG.

  An upper fixed contact 15a and a lower fixed contact 16a are held on the central base 10c. A terminal portion 15b is formed integrally with the upper fixed contact 15a, and the terminal portion 15b extends from the central base body 10c to the near side. A terminal portion 16b is formed integrally with the lower fixed contact 16a, and the terminal portion 16b extends from the central base body 10c in the back direction.

  In the manufacturing method of the switching device 1, first, the fixed conductors 11a and 12a and the fixed contacts 13a and 14a are arranged in the mold, and molten resin is injected into the mold, and the side base body 10a is formed by a so-called insert molding method. The Similarly, the side base 10b holding the fixed conductors 11b and 12b and the fixed contacts 13b and 14b is formed by the insert molding method, and the central base 10c having the fixed contacts 15a and 16a is formed by the insert molding method. . Thereafter, the bases 10a, 10b, and 10c holding the fixed conductor and the fixed contact are placed in the mold, the molten resin is injected into the mold, and the case 2 is formed by a so-called two-color molding method. Therefore, the bases 10a, 10b, and 10c are integrated and fixed in the three openings 2c of the bottom 2a of the case 2. A configuration including the integrated bottom portion 2a and the base bodies 10a, 10b, and 10c is referred to as a base.

  As shown in FIG. 3, an intermediate insulating portion 10d formed integrally with the side base 10a by an insulating synthetic resin material is interposed between the upper fixed contact 13a and the lower fixed contact 14a. A side sliding portion 17a is configured by the contact 13a, the lower fixed contact 14a, and the intermediate insulating portion 10d. In the side sliding portion 17a, the upper fixed contact 13a, the lower fixed contact 14a, and the intermediate insulating portion 10d are formed with the same width dimension. Similarly, in the side base 10b, a side sliding portion 17b is formed by the upper fixed contact 13b, the lower fixed contact 14b, and the intermediate insulating portion 10e. Further, in the central base body 10c, a central sliding portion 17c is constituted by the upper fixed contact 15a, the lower fixed contact 16a and the intermediate insulating portion 10f.

  As shown in FIGS. 2 and 3, a switching movable unit 20 is provided in the main operation unit. The switching movable unit 20 includes a pair of fulcrum conductor plates 21 and 22 and an independent conductor plate 23 positioned between the fulcrum conductor plates 21 and 22. The three conductor plates 21, 22, and 23 are formed of conductive metal plates, and each is held by the movable insulator 27. In the manufacturing process of the switching movable part 20, the three conductor plates 21, 22, and 23 are installed in a mold, molten resin is injected into the mold, and the movable insulator 27 is formed by an insert molding method.

  As shown in FIGS. 3 and 4, the fulcrum conductor plate 21 has a movable end portion 21 a on the front side in the drawing, and the fulcrum conductor plate 22 has a movable end portion 22 a on the front side in the drawing. A first fulcrum support portion 27a is formed on the first fixed conductor 11a held on the side base 10a, and the first fulcrum is supported on the first fixed conductor 11b held on the side base 10b. A support portion 27b is formed. The movable end portion 21a is hooked on the first fulcrum support portion 27a, the movable end portion 22a is hooked on the first fulcrum support portion 27b, and the switching movable portion 20 is connected to the movable end portions 21a and 22a. A contact portion with one fulcrum support portion 27a, 27b is supported as a first fulcrum so as to be swingable up and down.

  As shown in FIG. 4, the side movable contact 24 is fixed to the lower surface of the fulcrum conductor plate 21 on the free end side. The side movable contact 24 is formed of an elastically deformable conductive metal plate and is electrically connected to the fulcrum conductor plate 21. The side movable contact 24 is provided with a pair of sandwiching sliding pieces 24a and 24a facing left and right, and the side sliding portion 17a shown in FIG. 3 is sandwiched between the sandwiching sliding pieces 24a and 24a. Yes. Similarly, the side movable contact 25 is electrically connected and fixed to the lower surface of the free end side of the fulcrum conductor plate 22. A pair of sandwiching sliding pieces 25a and 25a is provided on the side movable contact 25, and the side sliding portion 17b is sandwiched between the sandwiching sliding pieces 25a and 25a. Similarly, the central movable contact 26 is conducted and fixed to the lower surface of the independent conductor plate 23. A pair of sandwiching sliding pieces 26a, 26a are provided on the central movable contact 26, and the center sliding portion 17c is sandwiched between the sandwiching sliding pieces 26a, 26a.

  As shown in FIGS. 2, 3, and 4, an operation conductor plate 30 is provided between the bases 10 a, 10 b, and 10 c and the switching movable unit 20 in the main operation unit. The operation conductor plate 30 is formed of a conductive metal plate. A pair of movable end portions 31 a and 31 b are formed on the base side which is one end portion of the operation conductor plate 30. As shown in FIGS. 3 and 4, a second fulcrum support portion 35a is formed on the second fixed conductor 12a held on the side base 10a, and the second fixing is held on the side base 10b. A second fulcrum support portion 35b is formed on the conductor 12b. The movable end portion 31a is hooked on the second fulcrum support portion 35a, the movable end portion 31b is hooked on the second fulcrum support portion 35b, and the operation conductor plate 30 is connected to the movable end portions 31a, 31b and the second fulcrum support portion 35b. A contact portion with the two fulcrum support portions 35a and 35b is supported as a second fulcrum so as to be swingable in the vertical direction.

  A first fulcrum that is a contact portion between the movable end portions 21a and 22a and the first fulcrum support portions 27a and 27b, and a contact portion between the movable end portions 31a and 31b and the second fulcrum support portions 35a and 35b. The second fulcrum is located at a position left and right apart in FIG. 5, and the free end of the switching movable portion 20 and the free end of the operation conductor plate 30 extend in opposite directions. That is, the first fulcrum and the second fulcrum are arranged at positions separated from each other in the extending direction (longitudinal direction) of the base bodies 10a, 10b, and 10c.

  As shown in FIG. 3, on the free end side of the switching movable portion 20, a pair of latching holes 23 a and 23 b are opened in the independent conductor plate 23, and on the free end side that is the other end portion of the operation conductor plate 30. Has a pair of retaining holes 32a and 32b. A pair of tension coil springs 41 and 42 are provided in the main operating part. One hook portion 41a of the tension coil spring 41 is hung on the retaining hole 23a, and the other hook portion 41b is suspended on the retaining hole 32a. One hook portion 42a of the tension coil spring 42 is hooked on the latch hole 23b, and the other hook portion 42b is hooked on the latch hole 32b.

  The tension coil springs 41 and 42 are formed of a conductive spring wire, and the tension coil springs 41 and 42 pull the free end side of the switching movable portion 20 and the free end side of the operation conductor plate 30 to each other. In addition, the independent conductor plate 23 and the operation conductor plate 30 are electrically connected via the tension coil springs 41 and 42.

  An operation piece 33 is bent at a tip portion located on the free end side of the operation conductor plate 30. As shown in FIG. 1, a sliding hole 3a is formed in the lid 3, and an operating body 50 is slidably supported in the sliding hole 3a. More precisely, the operating body 50 is supported by a guide portion (not shown) provided in the case 2 so as to be movable up and down. As shown in FIG. 5, inside the case 2, a pressing portion 51 is formed at the lower end portion of the operating body 50, and when the operating body 50 is lowered toward the inside of the case 2, The piece 33 is pushed downward.

  As shown in FIG. 4, holding pieces 23 c and 23 d are arranged on the independent conductor plate 23 provided on the switching movable portion 20 in a direction intersecting (orthogonal to) the direction in which the tensile force of the tension coil springs 41 and 42 acts. Are integrally formed. As shown in FIG. 3, the holding pieces 23 c and 23 d are held by the movable insulator 27, and the tip portions protrude from the movable insulator 27 to the left and right. Although the tensile force of the tension coil springs 41 and 42 is always applied to the independent conductor plate 23, the holding pieces 23 c and 23 d are held by the movable insulator 27, so that the independent conductor plate 23 is separated from the movable insulator 27. It is difficult to cause problems that come off.

<Assembly work>
The assembly work of the switching device 1 will be described.

  The side bases 10a and 10b and the central base 10c shown in FIGS. 2 and 5 are integrally fixed to the bottom 2a of the case 2 by a two-color molding method.

  The operation conductor plate 30 and the switching movable portion 20 connected by the tension coil springs 41 and 42 are incorporated in the case 2. At this time, the movable end portions 31a, 31b of the operation conductor plate 30 are second fulcrum support portions 35a, 35b formed on the second fixed conductors 12a, 12b located on the bottom 2a (base) side of the case 2. Be hooked on. Further, the movable end portions 21a and 22a of the fulcrum conductor plates 21 and 22 of the switching movable portion 20 are hooked on the first fulcrum support portions 27a and 27b formed on the first fixed conductors 11a and 11b.

  When the operation conductor plate 30 connected by the tension coil springs 41 and 42 and the switching movable portion 20 are incorporated in the case 2, the operation conductor is caused by the tensile force of the tension coil springs 41 and 42 as shown in FIG. 5. The plate 30 tends to be flipped up counterclockwise (α1 direction), and the switching movable portion 20 tends to be flipped up clockwise (β1 direction). However, the regulation piece 37 bent downward on the fulcrum side in the operation conductor plate 30 abuts against a stopper portion (not shown) formed on the bottom 2a of the case 2, so that the operation conductor plate 30 is counterclockwise (α1 direction). ) Is restricted. Further, the restriction protrusion 28 protruding downward from the movable insulator 27 hits the stopper portion 10g formed on the side bases 10a and 10b, and the switching movable portion 20 is restricted from being flipped up in the clockwise direction (β1 direction). Is done.

  Therefore, the operation body 50 and the lid body 3 can be easily assembled to the case 2 in a state where the operation conductor plate 30 and the switching movable portion 20 are incorporated in the case 2.

<Description of operation>
Next, the operation of the switching device 1 will be described.

  FIG. 6A is a side view in which the base (bases 10a, 10b, 10c, bottom 2a) and the movable insulator 27 are removed from the main operating part in a free state where no operating force is applied to the operating body 50. FIG. 6B is a schematic diagram showing the operating posture of each part in a free state.

  6 to 9, the movable end portions 21a and 22a formed on the fulcrum conductor plates 21 and 22 are in contact with the first fulcrum support portions 27a and 27b formed on the first fixed conductors 11a and 11b. The portion is shown as a first fulcrum S1, and movable end portions 31a and 31b formed on the operation conductor plate 30, and second fulcrum support portions 35a and 35b formed on the second fixed conductors 12a and 12b, Is shown as a second fulcrum S2. A hooking portion between the hook portions 41a and 42a of the tension coil springs 41 and 42 and the independent conductor plate 23 provided in the switching movable portion 20 is shown as a first biasing force application point D1, and the tension coil spring A hooking portion between the hook portions 41b and 42b of 41 and 42 and the free end of the operation conductor plate 30 is shown as a second urging force action point D2.

  In the free state shown in FIGS. 6A and 6B, the urging force F1a of the tension coil springs 41 and 42 acting on the first urging force acting point D1 and the tension coil acting on the second urging force acting point D2 are shown. The line of action with the urging force F2a of the springs 41 and 42 is located above the first fulcrum S1. Accordingly, the operation conductor plate 30 is rotated counterclockwise (α1 direction) about the second fulcrum S2, and the switching movable portion 20 is rotated clockwise (β1 direction) about the first fulcrum S1. It has been made. The rotation of the switching movable unit 20 in the clockwise direction is restricted by a part of the switching movable unit 20 on the left side in the drawing contacting the ceiling surface of the lid 3.

Therefore, the holding slide piece 24a of the side movable contact 24 provided in the switching movable portion 20 is in contact with the upper fixed contact 13a in the side slide portion 17a. Similarly, the holding sliding piece 25a of the side movable contact 25 is in contact with the upper fixed contact 13b at the side sliding portion 17b. Further, the holding sliding piece 26a of the central movable contact 26 is electrically connected to the upper fixed contact 15a at the central sliding portion 17c.
The circuit conduction state of the switching device 1 at this time is as shown in FIG.

(1) The first fixed conductor 11a is connected to the upper fixed contact 13a via the latching portion between the first fulcrum support portion 27a and the movable end portion 21a, the fulcrum conductor plate 21, and the lateral movable contact 24. The terminal portion 11c and the terminal portion 13c are in a conductive state.

(2) The first fixed conductor 11b is connected to the upper fixed contact 13b via the latching portion between the first fulcrum support portion 27b and the movable end portion 22a, the fulcrum conductor plate 22, and the lateral movable contact 25. The terminal portion 11d and the terminal portion 13d are in a conductive state.

(3) The second fixed conductors 12a and 12b are provided with latching portions between the second fulcrum support portions 35a and 35b and the movable end portions 31a and 31b, the operation conductor plate 30, and the two tension coil springs 41 and 42. And the upper fixed contact 15a through the independent conductor plate 23 and the central movable contact 26. Therefore, the terminal portion 12c, the terminal portion 12d, and the terminal portion 15b are in a conductive state.

  FIG. 7A is a side view in which the base and the movable insulator 27 in a state where the operating body 50 is being pushed are deleted, and FIG. 7B is an operation posture of each part in the middle state. It is a schematic diagram which shows. FIG. 8A is a side view in which the base and the movable insulator 27 at the time when the contact is switched are deleted, and FIG. 8B shows the operation posture of each part at the time when the contact is switched. It is a schematic diagram.

  When the downward operating force P acts on the operating body 50 and the operating body 50 is pushed down to the position of FIG. 7A toward the inside of the case 2, the operating conductor plate 30 rotates clockwise (α2 direction). Then, as shown in FIG. 7B, the second urging force action point D2 moves beyond the first fulcrum S1 and below it. Since the urging force action line connecting the first urging force action point D1 and the second urging force action point D2 moves downward from the first fulcrum S1, at this point, the switching movable part 20 is counteracted. A clockwise moment (β2 direction) starts to act.

  Further, the operating body 50 is pushed down to a predetermined position, and the counterclockwise (β2 direction) moment applied from the tension coil springs 41 and 42 to the switching movable portion 20 causes each movable contact 24, 25, 26 and the upper fixed contact. When it becomes larger than the resistance moment due to the static friction force with 13a, 13b, 15a, as shown in FIGS. 8 (A) and 8 (B), the switching movable part 20 rotates counterclockwise (β2 direction) in an instant. . That is, the switching movable part 20 performs a snap action operation by the urging force of the tension coil springs 41 and 42. At this time, the sandwiching sliding piece 24a of the side movable contact 24 slides on the side sliding portion 17a to contact the lower fixed contact 14a, and at the same time, the sandwiching sliding piece 25a of the side movable contact 25 is laterally slid. The moving portion 17b slides to contact the lower fixed contact 14b. Further, the sandwiching sliding piece 26a of the central movable contact 26 slides on the central sliding portion 17c and comes into contact with the lower fixed contact 16a.

  As a result, the contacts are switched in all three sliding portions 17a, 17b, and 17c, and in the circuit diagram shown in FIG. 10, the terminal portion 11c and the terminal portion 14c are in a conductive state, and the terminal portion 11d and the terminal portion are connected. 14d becomes conductive. Further, the terminal portions 12c and 12d and the terminal portion 16b are brought into conduction.

  FIG. 9A is a side view in which the base and the movable insulator 27 are removed in a state where the operating body 50 is pushed down to the operation dead center, and FIG. 9B shows the operation posture of each part at that time. It is a schematic diagram shown. 9A and 9B, the moment in the β2 direction acting on the switching movable portion 20 is maximized. Therefore, while the operating body 50 is pushed down to the position shown in FIGS. 9A and 9B, the switching movable portion 20 is reliably rotated and the contact is switched.

  In FIGS. 9A and 9B, the switching movable portion 20 rotates to a substantially horizontal posture and hits the stopper portion provided in the case 2, and cannot be rotated further counterclockwise (β2 direction). At this time, since the second urging force application point D2 moves to a position far away from the first fulcrum S1, the tensile force (F1b, F2b or F1c, F2c) of the tension coil springs 41, 42 A large moment in the counterclockwise direction (α1 direction) acts on the operation conductor plate 30. For this reason, when the operating force P applied to the operating body 50 is removed, the operating conductor plate 30 rotates counterclockwise (α1 direction) about the second fulcrum S2.

  While the operation conductor plate 30 returns to the initial posture shown in FIGS. 6A and 6B, the moment in the clockwise direction (β1 direction) applied to the switching movable unit 20 by the urging force of the tension coil springs 41 and 42 is as follows. When the resistance moment due to the static frictional force between the movable contacts 24, 25, 26 and the lower fixed contacts 14a, 14b, 16a becomes larger, the switching movable portion 20 instantly rotates clockwise (β1), and each movable contact 24 , 25 and 26 come into contact with the upper fixed contacts 13a, 13b and 15a, and the circuit returns to the initial state shown in FIG.

<Effects of the embodiment>
In the above embodiment, the independent conductor plate 23 provided in the switching movable portion 20 and the operation conductor plate 30 are connected by the two tension coil springs 41 and 42. Since the urging force for attracting the free end of the switching movable portion 20 and the free end of the independent conductor plate 23 is shared by a plurality of (two in the embodiment) tension coil springs, The spring constant of the tension coil spring is not excessively increased. Therefore, the load caused by the friction of the hook portions 41a, 42a and the hook holes 23a, 23b and the load caused by the friction of the hook portions 41b, 42b and the hook holes 32a, 32b can be reduced. As a result, the wear of the contact portions of the hook portion and the retaining hole is less likely to occur, and the energization path using the tension coil springs 41 and 42 can be set in a stable state.

  Further, as shown in the circuit diagram of FIG. 10, since the tension coil springs 41 and 42, which are conductors, are interposed in parallel between the operation conductor plate 30 and the independent conductor plate 23, the tension coil spring 41, The direct current resistance when 42 is used as an energization path can also be reduced.

  Furthermore, the point of application of the urging force that acts on the independent conductor plate 23 from the two tension coil springs 41 and 42 is disposed at equal positions on the left and right with respect to the center of the switching movable unit 20. Further, the two tension coil springs 41 and 42 are arranged between a pair of fulcrum conductor plates 21 and 21 located on the left and right sides. Therefore, the switching movable unit 20 is less likely to cause a twisting operation, and can be rotated in a stable posture around the first fulcrum S1.

  The center line of one tension coil spring 41 is located between the side movable contact 24 and the center movable contact 26, and the center line of the other tension coil spring 42 is located between the side movable contact 25 and the center movable contact. 26. Although the switching movable part 20 is rotated by the elastic force of the tension coil springs 41 and 42, the line of action of the urging force of the tension coil springs 41 and 42 is located between the adjacent movable contacts. A force for sliding the movable contacts 24, 25, 26 and the fixed contacts can be uniformly applied to the movable contacts, and the switching operation of the plurality of contacts can be stabilized.

  As shown in FIG. 8B, the distance from the first fulcrum S1 of the switching movable unit 20 to the first urging force application point D1 is L1, and each movable contact 24, 25, Assuming that the distance between the 26 sliding pieces 24a, 25a and 26a is L2, L1 is longer than L2 (L1> L2). That is, the clamping slide pieces 24a, 25a, and 26a are located between the first fulcrum S1 and the first urging force application point D1. Therefore, it becomes possible to amplify the operating force acting on the holding slide pieces 24a, 25a, 26a by L1 / L2 times with respect to the driving force acting on the first biasing force acting point D1, for example, FIG. (A) In the state of (B), the switching movable part 20 can be reliably rotated counterclockwise.

  As shown in FIG. 6B, the length La between the second fulcrum S2 of the operation conductor plate 30 and the second urging force action point D2 is the same as the first fulcrum S1 of the switching movable unit 20 and the first fulcrum S1. It is sufficiently longer than the distance Lb from the urging force acting point D1. Therefore, in the free state shown in FIG. 6B, the rotation angle θ2 of the operation conductor plate 30 with respect to the horizontal direction can be made relatively small. Therefore, even when the switching movable portion 20 is rotated at a relatively large angle θ1 and the sliding distance between the holding slide pieces 24a, 25a, and 26a is increased, the operating angle θ2 of the operation conductor plate 30 is reduced. can do. Therefore, the reaction force received from the operation conductor plate 30 when the operation body 50 is pressed can be made relatively small, and the operation feeling becomes good.

DESCRIPTION OF SYMBOLS 1 Switching apparatus 2 Case 3 Lid | cover body 10a, 10b Lateral base | substrate 10c Central base | substrate 11a, 11b 1st fixed conductor 12a, 12b 2nd fixed conductor 13a, 13b, 15a Upper fixed contact 14a, 14b, 16a Lower fixed contact 17a , 17b Side sliding portion 17c Center sliding portion 20 Switching movable portion 21, 22 Supporting conductor plates 21a, 22a Movable end portion 23 Independent conductor plates 24, 25 Side movable contact 26 Central movable contact 27 Movable insulators 27a, 27b First fulcrum support portion 30 Operation conductor plates 31a and 31b Movable end portion 33 Operation pieces 35a and 35b Second fulcrum support portions 41 and 42 Tension coil spring 50 Operation body S1 First fulcrum S2 Second fulcrum D1 First Energizing force action point D2 Second energizing force action point

Claims (5)

A base formed of an insulating material; a plurality of fixed conductors fixed to the base; a plurality of sliding portions formed on the base; a fixed contact provided on the sliding portion; In a switching device having a switching movable part that supports a plurality of movable contacts that slide on the moving part, and an operation conductor plate that is operated by the operating body,
The switching movable portion is fixed to a movable insulator with a fulcrum conductor plate and an independent conductor plate separated from the fulcrum conductor plate, and the movable contact is provided on each of the fulcrum conductor plate and the independent conductor plate,
The switching movable portion is swingably supported with a contact portion between the fulcrum conductor plate and a part of the fixed conductor as a first fulcrum, and a base portion of the operation conductor plate is connected to another fixed conductor. The first fulcrum and the second fulcrum are arranged at positions spaced apart from each other with the abutting part supported as a second fulcrum, and the front end of the operation conductor plate is the first fulcrum. Located on the fulcrum side, the tip side can be pressed by the operating body,
A plurality of tension coil springs extending along a direction in which the first fulcrum and the second fulcrum face each other are provided, and one end of each of the tension coil springs is on the front side of the operation conductor plate. When the other end is hooked to the independent conductor plate and the operating conductor plate is swung by the operating body, the switching movable portion is moved along with the swinging motion. A snap action operation is performed by the urging force of the tension coil spring, and the movable contact slides on the sliding portion,
The switching device, wherein the operation conductor plate and the independent conductor plate are electrically connected via a plurality of the tension coil springs.   The abutting portions between the sliding portion and the movable contact are arranged at intervals in a direction orthogonal to the direction in which the center line of the tension coil spring extends, and the center lines of the tension coil springs are adjacent to each other. The switching device according to claim 1, wherein the switching device is positioned in the middle of the matching contact portions.   3. The switching device according to claim 1, wherein in the switching movable portion, the fulcrum conductor plate is disposed on both sides of the independent conductor plate, and the tension coil spring is disposed between the fulcrum conductor plates.   An abutting portion between the movable contact and the sliding portion is located between a latching portion (D1) between the tension coil spring and the independent conductor plate and the first fulcrum (S1). Item 4. The switching device according to any one of Items 1 to 3.   The distance (La) from the latching portion (D2) between the tension coil spring and the operation conductor plate to the second fulcrum (S2) is the latching portion (D1) between the tension coil spring and the independent conductor plate. ) To the first fulcrum (S1), the switching device is longer than the distance (Lb).

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