JP2011222207A - Seesaw switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a long-life seesaw switch with a high contact reliability for its contact portion.SOLUTION: A seesaw switch includes: a central terminal 3 (a supporting plate 3b) and a fixed contact 7, which are provided apart from each other; a conductor plate 5 supported by the central terminal 3 at a point substantially in the middle of the conductor plate 5 lengthwise, seesawing on the central terminal 3 as a fulcrum A, and having a movable contact 6 which is provided on a first-side portion 5b in a longitudinal direction of the conductor plate 5 on one side relative to the central terminal 3 and which is brought into/out of contact with the fixed contact 7; a control body 8 seesawably supported along the longitudinal direction of the conductor plate 5; a compression coil spring 10 housed in the control body 8; a driving body 11 energized by the compression coil spring 10, and moving while pressing the conductor plate 5 as the control body 8 seesaws; and a metal spring 12 connecting between the conductor plate 5 and the central terminal 3 while keeping electrical continuity therebetween at all times. The metal spring 12 presses a second-side portion 5c of the conductor plate 5 from a side opposite to where the driving body 11 is located; the second-side portion 5c is lengthwise opposed to the first-side portion 5b, and located on another side relative to the central terminal 3.

Description

  The present invention relates to a seesaw switch used for a power switch of an electric device or an electronic device.

  This type of seesaw switch accommodates a compression coil spring inside an operation body, and a drive body is provided at the tip of the operation body. The operation body swings around a support shaft by a push operation and is urged by the compression coil spring. By moving the drive body while pressing a seesaw-shaped conductor plate (movable contact piece) with a movable contact at one end, the center terminal supporting the center of the seesaw-shaped conductor plate is used as a fulcrum. Oscillating (seesaw motion), the fixed contact and the movable contact arranged at a position opposite to the movable contact come in and out of contact. When the movable contact comes into contact with the fixed contact, the fixed terminal provided with the fixed contact conducts through the center terminal and the seesaw-shaped conductor plate, and connects the external circuit connected to the center terminal and the external circuit connected to the fixed terminal. To do.

  In the seesaw switch, bounce (a phenomenon in which the conductor plate jumps on the swing fulcrum and separates from the center terminal) is caused by the impact when the movable contact contacts the fixed contact. In this case, an arc is generated between the conductor plate and the center terminal. Therefore, the conductor plate and the center terminal are damaged by the heat of the arc, and the product life is significantly reduced.

  Under the above background technology, there is a technique for preventing an arc from being generated between the conductor plate and the central terminal even if bounce occurs by always conducting a conductive connection between the conductor plate and the central terminal using a metal spring. There is (for example, Patent Document 1).

JP-A-9-259704

  In the above prior art, the metal spring is elastically contacted with the conductor plate and the center terminal in a plane perpendicular to the swing fulcrum shaft, so that the elastic force of the metal spring presses the movable contact against the fixed contact by the biasing force of the coil bar spring. It becomes a load when obtaining the contact pressure, and there is a problem of poor contact due to a decrease in contact pressure of the contact.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a seesaw switch having a long life and a high contact reliability of a contact provided with a metal spring for always conducting a conductive connection between a conductor plate and a central terminal. There is.

  In order to achieve the above object, according to the first aspect of the present invention, a central terminal and a fixed contact that are spaced apart from each other, and a substantially middle portion in the longitudinal direction are supported by the central terminal, and the central terminal is A conductor plate that swings as a fulcrum and that has a movable contact that contacts and separates from the fixed contact on one side in the longitudinal direction on one side of the center terminal, and can swing along the longitudinal direction of the conductor plate An operation body supported by the operation body, a compression coil spring housed in the operation body, and a biasing force applied by the compression coil spring, and moves while pressing the conductor plate as the operation body swings. And a seesaw switch including a metal spring that always connects the conductor plate and the central terminal in a conductive manner. The metal spring is more than the central terminal on the side opposite to one side in the longitudinal direction of the conductor plate. The other side of the other side in the longitudinal direction Is characterized in that the pressing from the opposite side to the driver.

  According to a second aspect of the present invention, in the seesaw switch according to the first aspect, the metal spring is in contact with the central terminal, and the longitudinal direction of the conductive plate while the tip presses the conductive plate. A leaf spring having a spring piece that moves along the tip of the spring piece, the tip of the spring piece moves away from the center terminal when the movable contact is separated from the fixed contact, and the movable contact is When contacting the fixed contact, it moves in a direction approaching the center terminal.

  According to the first aspect of the present invention, in the seesaw switch, even if bounce occurs and the conductor plate jumps up on the swing fulcrum and separates from the center terminal, the conductor plate and the center terminal are always electrically connected by the metal spring. Therefore, there is no risk of generating an arc between the conductor plate and the center terminal, and the life can be extended as in the above prior art, but the metal spring is the center opposite to the one side in the longitudinal direction of the conductor plate. Since the other side of the longitudinal direction other than the terminal is pressed from the side opposite to the drive body, when the movable contact is in contact with the fixed contact, the elastic force of the metal spring causes the drive body of the conductor plate to Through swinging as a fulcrum, the movable contact is further pressed against the fixed contact, acting in the direction of increasing the contact pressure, and the urging force of the compression coil bar spring may cause a load when the movable contact is pressed against the fixed contact to obtain the contact pressure But Tondonaku, it is possible to obtain a large contact pressure as compared with the prior art. As a result, it is possible to provide a seesaw switch having a long life and a high contact reliability of a contact provided with a metal spring for always conducting and connecting the conductor plate and the central terminal.

  According to the invention described in claim 2, the metal spring includes a contact portion that contacts the central terminal, and a spring piece that moves along the longitudinal direction of the conductor plate while the tip portion presses the conductor plate. The leaf spring has a tip that moves in a direction away from the center terminal when the movable contact is separated from the fixed contact, and when the movable contact is in contact with the fixed contact. Since it moves in the direction approaching the center terminal, the distance between the tip of the spring piece (force point) and the tip of the drive body (fulcrum) is larger than when the movable contact is opened (OFF) away from the fixed contact. When the movable contact is in contact with the fixed contact, the closed contact (ON) becomes larger, and the elastic force of the metal spring can be efficiently converted to the contact pressure of the contact.

1 is an external perspective view of a seesaw switch according to an embodiment of the present invention. Sectional drawing at the time of opening of the seesaw switch of FIG. Sectional drawing at the time of closing of the seesaw switch of FIG. The perspective view which shows the contact part of the seesaw switch of FIG. The perspective view which shows the metal spring in the contact part of the seesaw switch of FIG. The external appearance perspective view of the metal spring of the seesaw switch of FIG. The top view which shows the 2 pole single throw structure of the seesaw switch of FIG. The perspective view which shows the 2 pole single throw structure of the seesaw switch of FIG. The other perspective view which shows the 2 pole single throw structure of the seesaw switch of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an external perspective view of a seesaw switch according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the seesaw switch of FIG. 1 when it is opened (OFF), and FIG. 3 is a closed (ON) of the seesaw switch of FIG. 4 is a perspective view showing a contact portion of the seesaw switch of FIG. 1, FIG. 5 is a perspective view showing a metal spring in the contact portion of the seesaw switch of FIG. 1, and FIG. 6 is a metal of the seesaw switch of FIG. It is an external appearance perspective view of a spring.

  1 to 6, the seesaw switch of this embodiment includes a case 1, a cover 2, a center terminal 3, a fixed terminal 4, a conductor plate 5, a movable contact 6, a fixed contact 7, an operating body 8, a knob 9, and a compression coil. A spring 10, a driving body 11, a metal spring 12, and a magnet 13 are included.

  A case 1 molded into a shallow box shape (bottomed rectangular tube shape) with an open top surface using an insulating material is provided with a central terminal 3 and a fixed terminal 4 spaced apart from each other at the bottom.

  A cover 2 molded into a relatively deep box shape (a square cylinder shape with a ceiling) made of an insulating material is externally fitted to the case 1, and the case 1 forms a switch outer box. The cover 2 is fixed in a removable manner by fitting a plurality of engaging projections 1 a projecting from the outer surface of the case 1 and a plurality of engaging holes 2 a opened at the bottom of the cover 2. The top of the cover 2 is formed with a rectangular recess 2b in which the knob 9 is disposed. The recess 2b opens a skylight 2c through which the operating body 8 is inserted at the bottom, and rises from four side edges of the bottom. Of the four peripheral side surfaces, the operating body 8 is swingably supported along the longitudinal direction (length direction) of the conductor plate 5 on two peripheral side surfaces facing each other in the short direction (width direction) of the conductor plate 5. For this purpose, a pair of inverted U-shaped bearings 2d are provided.

  The center terminal 3 formed by punching and bending a metal plate has an upper and lower middle part fixed to the bottom of the case 1 and is a lower part that hangs down from the bottom of the case 1 at a right angle to the outside of the case 1. And a terminal plate 3a for connecting the external electric circuit (primary side) and a support plate 3b serving as a swinging fulcrum of the conductor plate 5 at an upper portion standing inside the case 1 at a right angle from the bottom of the case 1. . The support plate 3b is provided with a pair of locking pins 3c that are erected from both sides of the upper edge.

  The fixed terminal 4 formed by punching and bending a metal plate has an upper and lower middle portion fixed to the bottom of the case 1 and is a lower part that hangs down from the bottom of the case 1 at a right angle to the outside of the case 1. And a terminal plate 4a that connects the external electric circuit (secondary side) and an upper part that protrudes from the bottom of the case 1 along the inner surface thereof to the inside of the case 1 to form a contact mounting seat 4b.

  The conductor plate 5 formed into a rectangular plate shape by punching and bending a metal plate has a pair of notches 5a formed at substantially the middle portions on both side edges in the longitudinal direction, and a pair of notches 5a. The stop pin 3c is inserted from below, and the lower surface of the substantially middle portion of the conductor plate 5 between the pair of notches 5a is placed on the upper edge of the support plate 3b between the pair of locking pins 3c. Thereby, the movement of the conductor plate 5 in the longitudinal direction is restricted by the pair of notches 5a and the pair of locking pins 3c, and the conductor plate 5 is substantially in the middle of the conductor plate 5 between the pair of notches 5a. The contact point between the lower surface of the part and the upper edge of the support plate 3b between the pair of locking pins 3c is supported as a swing fulcrum (swing shaft) A so as to be swingable (seesaw motion) on the support plate 3b. Mounted inside the case 1.

  When mounted, the conductor plate 5 extends along a direction in which the central terminal 3, the fixed terminal 4, and the fixed contact 7 are separated from each other, and is one side in the longitudinal direction on one side of the support plate 3b (swinging fulcrum A). The part 5b extends to one side of the support plate 3b on which the fixed terminal 4 is disposed, and the end of the one side part 5b is located at the upper part facing the contact mounting seat 4b. On the other hand, the other side portion 5c in the longitudinal direction on the other side of the support plate 3b extends to the other side of the support plate 3b where the fixed terminal 4 is not disposed, and the end portion of the other side portion 5c is inside the bottom portion of the case 1. It is located in the upper part opposite to the seat part 1b which protruded and formed on the surface.

  The movable contact 6 formed of a metal material in a rivet shape having a shaft portion and a head portion is inserted into the through hole provided at the end portion of the longitudinal side portion 5b of the conductor plate 5 from below, and the head portion Is fixed to the end of the one side portion 5b in the longitudinal direction of the conductor plate 5 in a state of being disposed on the lower surface of the end portion of the one side portion 5b in the longitudinal direction of the conductor plate 5.

  The fixed contact 7 formed of a metal material in a rivet shape having a shaft portion and a head portion penetrates the shaft portion from above through a through hole provided in the contact attachment seat 4b, and the head portion is arranged on the upper surface of the contact attachment seat 4b. In the state where it is provided, it is fixed to the fixed terminal 4 and disposed below the movable contact 6.

  The operation body 8 molded of an insulating material is inserted into the skylight 2c of the cover 2, and the upper part protrudes into the recessed part 2b of the cover 2 and the lower part protrudes into the inside of the cover 2; The lower part of the operating body upper part 8 a is integrally formed with a rectangular bar-like operating body lower part 8 b disposed inside the cover 2, and the upper part of the operating body upper part 8 a protruding into the recessed part 2 b of the cover 2 is provided. Among the upper four outer surfaces, the axis (center line) of the operating body upper portion 8a and the operating body lower portion 8b is formed from the two outer surfaces facing the two peripheral side surfaces of the recess 2b provided with the pair of bearings 2d. ) And a pair of support shafts (trunnion arms) 8c that are coaxial with an axis parallel to the swing support point (swing shaft) A, and the pair of support shafts 8c are closed by the pair of bearings 2d. Insert at the top. Thereby, the operating body 8 is supported by the cover 2 so as to be swingable along the longitudinal direction of the conductor plate 5 with the pair of support shafts 8c as swing support points.

  Knob 9 molded into a box-like shape (opened square cylinder) with an open bottom surface is made of insulating material. From the center of the square-shaped top that opens upward, the upper surface on one side is a pressing operation surface for opening the seesaw switch. 9a, the upper surface on the other side is a pressing operation surface 9b for closing the seesaw switch, and the lower end surface on one side of the knob 9 on the opening pressing operation surface 9a side is in a plane substantially parallel to the pressing operation surface 9a. The lower end surface of the knob 9 on the side of the closing pressing operation surface 9b is formed in a plane substantially parallel to the pressing operation surface 9b, and constitutes a seesaw button as a whole. The knob 9 is provided with a boss 9c that protrudes from the center of the top to the inner center of the knob 9 and a plurality of hooks 9d that protrude from the top to the periphery of the boss 9c.

  The knob 9 has a boss 9c inserted into a boss hole 8d formed at the upper end portion of the operating body upper portion 8a from above, and a plurality of hooks 9d are formed on a ring-shaped engaging protrusion 8e formed on the outer surface of the upper end portion of the operating body upper portion 8a. In a state where it is hooked from below, it is detachably attached to the upper end of the operating body 8 and is disposed in the recess 2 b of the cover 2. As for the knob 9 at the time of attachment, a top part protrudes upwards from the recessed part 2b of the cover 2. As shown in FIG.

  The operating body lower portion 8b has a bag-like inner hole 8f with the upper end closed, and constitutes a cylinder. A compression coil spring 10 made of a metal wire is accommodated in the inner hole 8f, and a driving body 11 molded into a square bar shape with an insulating material is slidably fitted into the inner hole 8f below the compression coil spring 10. The compression coil spring 10 constantly urges the operating body 8 and the drive body 11 in opposite directions along the axis (center line) of the operating body upper portion 8a and the operating body lower portion 8b, and a pair of support shafts 8c of the operating body 8 is provided. Is inserted and held in the closed upper part of the pair of bearings 2d of the cover 2, and the lower end of the driving body 11 protruding from the inner hole 8f to the lower end side of the operating body 8b is pressed against the upper surface of the conductor plate 5.

  The metal spring 12 made of a metal leaf spring forms a flat fixed portion 12a along the inner surface of the bottom portion of the case 1 at an intermediate portion in the longitudinal direction, and is bent in a longitudinal direction from one end of the fixed portion 12a. A contact portion 12b that contacts the support plate 3b is formed on one side, and the other end of the fixing portion 12a is bent from the other end of the fixing portion 12a so as to be inclined to the upper portion of the fixing portion 12a. And a contact portion 12d in contact with the conductor plate 5 is formed at the tip of the spring piece 12c, and the support plate 3b and the conductor plate 5 are always inserted and connected.

  The metal spring 12 fixes the fixing portion 12a to the inner surface of the bottom portion of the case 1 at the lower portion opposite the other side portion 5c of the conductor plate 5, and one end portion of the fixing portion 12a on the contact portion 12b side connects the lower portion of the support plate 3b. To penetrate. As a result, the contact portion 12b stands along the support plate 3b between the rib 1c and the support plate 3b that are formed to protrude from the bottom inner surface of the case 1 at the opposite lower side of the one side portion 5b of the conductor plate 5. It is held in pressure contact with the support plate 3b. Further, the spring piece 12c is disposed at a lower portion facing the other side portion 5c of the conductor plate 5 with an inclination approaching the support plate 3b as it goes upward, and the contact portion 12d is disposed on the other side portion 5c of the conductor plate 5. Press the lower surface of. The positioning of the fixing portion 12a is performed by press-fitting a boss 1d formed to protrude from the inner surface of the bottom portion of the case 1 at the lower portion facing the other side portion 5c of the conductor plate 5 into the boss hole 12e formed in the fixing portion 12a. This is performed simultaneously with the fixing of the fixing portion 12a.

  A rectangular parallelepiped magnet (permanent magnet) 13 is surrounded by a magnet housing wall 1e raised from the bottom inner surface of the case 1, and is disposed around the gap between the movable contact 6 and the fixed contact 7 when the seesaw switch is opened. The At this time, the outer side surface of the magnet 13 facing the gap is not surrounded by the magnet housing wall 1e except for both side edges (corner corners) of the magnet 13 and directly faces the gap.

  Next, the operation of the seesaw switch of the present embodiment having the above structure will be described with reference to FIGS.

  As shown in FIG. 2, when the seesaw switch is opened (OFF), the knob 9 attached to the upper end of the operating body 8 has the right opening pressing operation surface 9 a lowered, and the right lower end surface is a recess of the cover 2. 2b, with the pivot 8c extending in the direction perpendicular to the paper surface of FIGS. 2 and 3 as the center, the upper and lower portions can be swung in the left and right directions (clockwise and around the pivot 8c). The operating body 9 (which can be rotated counterclockwise within a predetermined angle range) has a lower part than the support shaft 8c at a swing end position in the left direction of FIGS. 2 and 3, and slides the upper part on the lower part 8b of the operating body. The drive body 11 that is movably fitted and urged by the compression coil spring 10 accommodated in the operation body lower part 8b extends in the left-right direction in FIG. 2 and FIG. , Supported by the upper edge of the support plate 3b rising from below, the contact point between the two is the swing fulcrum A As shown in FIGS. 2 and 3, the left side portion 5c and the right side portion 5b can swing upside down (predetermined in the clockwise and counterclockwise directions around the swing fulcrum A). It is positioned on the upper surface of the left side portion 5c of the conductive plate 5 that can be rotated within an angular range, and the upper surface of the left side portion 5c is pressed downward, and the conductive plate 5 has its left side portion 5c lowered and its end portion The lower surface is in contact with the seat 1b formed to protrude from the bottom of the case 1, and the right side 5b provided with the movable contact 6 at the end rises and can be moved from the fixed contact 7 installed at the lower portion opposite to the movable contact 6. The contact 6 is pulled upward. Therefore, the electric circuit connected to the central terminal 3 having the support plate 3b and the electric circuit connected to the fixed terminal 4 having the fixed contact 7 are in a non-conductive state. For example, when the seesaw switch is used as a power switch of an electric device, the electric device is in a power “off” state.

  At this time, the metal spring 12 is elastically contacted with the lower surface of the left side portion 5c where the conductor plate 5 is lowered at the position where the contact portion 12 is closest to the support plate 3b, and the spring piece 12c is bent with the fixed portion 12a side as a fulcrum. The power is stored.

  To close (ON) the seesaw switch in the open state shown in FIG. 2, as shown by the arrow P <b> 1 in FIG. 2, the pressing operation surface 9 b for closing on the left side of the knob 9 is pushed down from above. As a result of this push operation, as shown in FIG. 3, the operating body 8 moves counterclockwise around the support shaft 8c until the lower end surface on the left side of the knob 9 comes into contact with the bottom of the recess 2b of the cover 2. It pivots around the support shaft 8c and swings the lower part to the right, and stops at the position where the lower end surface on the left side of the knob 9 contacts the bottom of the recess 2b of the cover 2. Along with this, the driving body 11 moves rightward while pressing the upper surface of the conductor plate 5 downward, moves from the upper surface of the left side portion 5c to the upper surface of the right side portion 5b beyond the swing fulcrum A. Stop. As a result, the conductor plate 5 suddenly rotates clockwise around the swing fulcrum A when the driver 11 moves over the swing fulcrum A and moves to the upper surface of the right side 5b. The left side 5c is swung upward about the fulcrum A, the lower surface of the end is pulled upward from the seat 1b, and the right side 5b is swung downward about the rocking fulcrum A. The movable contact 6 is brought into contact with the fixed contact 7. Accordingly, the central terminal 3 and the fixed terminal 4 are conducted through the conductor plate 5. Therefore, the electric circuit connected to the central terminal 3 and the electric circuit connected to the fixed terminal 4 are in a conductive state. For example, when the seesaw switch is used as a power switch of an electric device, the electric device is in a power “on” state.

  At this time, the load transmitted to the knob 9 gradually increases while the driving body 11 moves on the upper surface of the left side portion 5c of the conductor plate 5, but moves beyond the swing fulcrum A to the upper surface of the right side portion 5b. At this point, it becomes abruptly reduced, so that a clear moderation (operation feeling) can be obtained.

  Even if bounce occurs and the conductor plate 5 jumps up on the swinging fulcrum A and is separated from the support plate 3b, the conductor plate 5 and the support plate 3b are always conductively connected by the metal spring 12. There is no possibility of generating an arc between the support plate 3b and the support plate 3b, and it is possible to prevent the product life from being significantly reduced by damaging the conductor plate 5 or the support plate 3b due to the heat of the arc, thereby extending the product life. .

  Further, the drive body 11 moves from the upper surface of the left side portion 5c to the upper surface of the right side portion 5b while pressing the upper surface of the conductor plate 5 downward, whereas the metal spring 12 is Since the lower surface of the left side portion 5 c of the conductor plate 5 is pressed upward, when the movable contact 6 is in contact with the fixed contact 7, the elastic force of the metal spring 12 is different from the upper surface of the right side portion 5 b of the conductor plate 5. The conductor plate 5 is rotated clockwise with the contact point with the lower end of the drive body 11 as the swing fulcrum B, the left side portion 5c is swung upward about the swing fulcrum B, and the swing fulcrum The right side 5b is swung downward about B, and the movable contact 6 is further pressed against the fixed contact 7 to increase the contact pressure. The elastic force of the metal spring 12 causes the elastic force of the metal spring 12 to hardly become a load when the movable contact 6 is pressed against the fixed contact 7 by the urging force of the compression coil spring 10 to obtain a contact pressure. As a result, the contact pressure increases and the contact reliability of the contact can be improved.

  Further, the metal spring 12 is disposed with an inclination in which the spring piece 12c approaches the support plate 3b as it goes upward at the lower portion facing the left side portion 5c of the conductor plate 5, and the contact portion 12d As the left side portion 5c swings upward, it moves leftward while pressing the lower surface of the left side portion 5c of the conductor plate 5 and moves away from the support plate 3b, so that the contact portion 12d (power point) and the driving body 11 The distance of the lower end (fulcrum) becomes larger when the pole is closed than when the pole is opened, and the elastic force of the metal spring 12 can be efficiently converted into the contact pressure of the contact.

  In order to open the seesaw switch in the closed state shown in FIG. 3, as shown by an arrow P2 in FIG. 3, the pressing operation surface 9a for opening on the right side of the knob 9 is pushed down from above. By this push operation, as shown in FIG. 2, the operating body 8 rotates clockwise around the support shaft 8c until the lower end surface on the right side of the knob 9 comes into contact with the bottom of the recess 2b of the cover 2. The lower part of the knob 9 is swung leftward about the support shaft 8c, and stops at a position where the lower end surface on the right side of the knob 9 is in contact with the bottom of the recess 2b of the cover 2. Along with this, the driving body 11 moves to the left while pressing the upper surface of the conductor plate 5 downward, and moves from the upper surface of the right side portion 5b to the upper surface of the left side portion 5c beyond the swing fulcrum A. Stop. As a result, the conductor plate 5 suddenly rotates clockwise around the swing fulcrum A when the driver 11 moves over the swing fulcrum A and moves to the upper surface of the left side 5c. The left side 5c is swung downward about the fulcrum A, the lower surface of the end is in contact with the seat 1b, and the right side 5b is swung upward about the rocking fulcrum A to move the movable contact 6 is pulled upward from the fixed contact 7.

  At this time as well, the load transmitted to the knob 9 gradually increases while the driving body 11 moves on the upper surface of the right side portion 5b of the conductor plate 5, but exceeds the swinging fulcrum A and on the upper surface of the left side portion 5c. Since it becomes small rapidly when it moves, a clear moderation (operation feeling) can be obtained.

  Further, the metal spring 12 moves in the right direction while the contact portion 12d presses the lower surface of the left side portion 5c of the conductor plate 5 in accordance with the downward swing of the left side portion 5c of the conductor plate 5, and the support plate 3b. To approach.

  Further, at the time of such opening, an arc may be generated between the movable contact 6 and the fixed contact 7, but in the gap between the movable contact 6 and the fixed contact 7, the magnetic field lines flowing toward the magnet 13 across the gap When an arc current in the vertical direction flows between the movable contact 6 and the fixed contact 7, the arc is subjected to a lateral force and the flow path is extended. Can do.

  As is clear from the above, the seesaw switch of the present embodiment is supported by the central terminal 3 at the center terminal 3 (support plate 3b) and the fixed contact 7 that are disposed apart from each other, and at a substantially intermediate portion in the longitudinal direction. A conductor plate 5 that swings about the center terminal 3 as a fulcrum A and that has a movable contact 6 that contacts and separates from the fixed contact 7 on one side 5b in the longitudinal direction on one side of the center terminal 3. An operating body 8 supported so as to be swingable along the longitudinal direction of the conductor plate 5, a compression coil spring 10 housed in the operating body 8, and a biasing force by the compression coil spring 10. Is provided with a drive body 11 that moves while pressing the conductor plate 5, and a metal spring 12 that always connects the conductor plate 5 and the central terminal 3 in a conductive manner. The length on the other side of the central terminal 3 opposite to the one side portion 5b in the direction The direction of the other side 5c, has the structure of pressing the side opposite to the driver 11.

  With the above configuration, even if bounce occurs and the conductor plate 5 jumps up on the swinging fulcrum and is separated from the center terminal 3, the conductor plate 5 and the center terminal 3 are always connected to the metal spring 12 from the conductor plate. There is no possibility of generating an arc between 5 and the central terminal 3, and the life can be extended. In addition, when the movable contact 6 is in contact with the fixed contact 7, the elastic force of the metal spring 12 further swings the movable contact 6 to the fixed contact 7 through swinging with the driving body 11 of the conductor plate 5 as the fulcrum B. It acts in the direction of increasing the contact pressure by pressing, and there is almost no risk of becoming a load when the movable contact 6 is pressed against the fixed contact 7 by the biasing force of the compression coil spring 10 to obtain a large contact pressure. it can. As a result, it is possible to obtain a seesaw switch having a long life and high contact reliability of the contact provided with the metal spring 12 that always connects the conductor plate 5 and the central terminal 3 in a conductive manner.

  Further, in the seesaw switch of this embodiment, the metal spring 12 is in contact with the central terminal 3 along the longitudinal direction of the conductor plate 5 while the contact portion 12b and the tip portion (contact portion) 12d press the conductor plate 5. A leaf spring having a moving spring piece 12c, the tip 12d of the spring piece 12c moves away from the central terminal 3 when the movable contact 6 is separated from the fixed contact 7, and the movable contact 6 is fixed. When contacting the contact 7, the contact 7 moves in a direction approaching the center terminal 3.

  With the above configuration, the distance between the distal end portion 12d (force point) of the spring piece 12c and the distal end portion (fulcrum) of the drive body 11 is greater than that when the movable contact 6 is opened (OFF) when the movable contact 6 is separated from the fixed contact 7. Is larger at the time of contact closing (ON) in contact with the fixed contact 7, and the elastic force of the metal spring 12 can be efficiently converted into the contact pressure of the contact.

  7 to 9, the seesaw switch of this embodiment is a two-pole single-throw type, and the operating body 8 is formed with a T-shape in which the operating body upper portion 8a is inverted upside down. The operating body lower part 8b is integrally formed at both ends of the lower part of the operating body upper part 8a so as to have two operating body lower parts 8b. Each operation body lower part 8b is provided with the central terminal 3, the fixed terminal 4, the conductor plate 5, the movable contact 6, the fixed contact 7, the compression coil spring 10, the drive body 11, and the metal spring 12, and has one knob. 9 and the operation body upper part 8a are configured with two first and second switch sections SW1 and SW2, and the two first and second switch sections SW1 and SW2 are simultaneously opened and closed by a push operation of one knob 9. Is.

  Moreover, as shown in FIGS. 7-9, two 1st and 2nd switch part SW1, SW2 is arrange | positioned parallelly so that the mutual conductor plate 5 may be parallel in the transversal direction, Case 1 is The partition wall 14 is raised from the bottom between the two first and second switch portions SW1 and SW2 except between the end portions of the one side portion 5b of the conductor plate 5, and the one side portion 5b of the conductor plate 5 is A magnet housing wall 1e is raised between the end portions, and one magnet 13 is configured to be shared by the two first and second switch portions SW1 and SW2.

3 central terminal 3b support plate 5 conductive plate 5b one side 5c other side 6 movable contact 7 fixed contact 8 operation body 10 compression coil spring 11 drive body 12 metal spring 12b contact portion 12c spring piece 12d contact portion (tip portion)

Claims (2)

A central terminal and a stationary contact arranged spaced apart from each other;
A substantially intermediate portion in the longitudinal direction is supported by the central terminal, and swings around the central terminal as a fulcrum and is movable toward and away from the fixed contact at one side in the longitudinal direction on one side of the central terminal. A conductor plate with contacts;
An operating body supported so as to be swingable along the longitudinal direction of the conductor plate;
A compression coil spring housed inside the operating body;
A driving body that is biased by the compression coil spring and moves while pressing the conductor plate as the operating body swings;
In a seesaw switch provided with a metal spring that always conductively connects the conductor plate and the central terminal,
The seesaw characterized in that the metal spring presses the other side in the longitudinal direction on the other side of the central terminal opposite to the one side in the longitudinal direction of the conductor plate from the side opposite to the driving body. switch. The seesaw switch according to claim 1,
The metal spring is a leaf spring having a contact portion that contacts the central terminal, and a spring piece that moves along the longitudinal direction of the conductor plate while a tip portion presses the conductor plate,
The tip of the spring piece moves in a direction away from the center terminal when the movable contact is separated from the fixed contact, and approaches the center terminal when the movable contact is in contact with the fixed contact. Seesaw switch characterized by moving to.

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