JP2012198993A - Seesaw switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the operation speed of a seesaw switch and the opening and closing speed of a contact independently.SOLUTION: A first contact segment 116 is long. A movable contact is provided at one end of the first contact segment 116. The first contact segment 116 is supported slidably, at the middle on the lower surface side thereof, on a fulcrum part 118 and a movable contact 115 swings to approach a fixed contact 114 and to recede therefrom. A second contact segment 117 is elongated in the longitudinal direction of the first contact segment 116. A sliding contact part 121 is provided at the middle on the lower surface side of the second contact segment 117, and touches the upper surface side of the first contact segment 116 slidably. The second contact segment 117 swings about the sliding contact part 121. A pressing part 113 slides in the longitudinal direction of the second contact segment 117 according to the operation for a seesaw body 103 while touching the upper surface side of the second contact segment 117 with a pressing force.

Description

  The present invention relates to a seesaw switch.

  Patent Document 1 describes a changeover switch 40. The changeover switch 40 includes a contact portion 42 including the rotation bar 14, the sliding portion 16, the first fixed contact 19, and the second fixed contact 20. The rotation bar 14 rotates about the fulcrum portion 13 and swings like a seesaw. The rotating bar 14 has a first movable contact 17 and a second movable contact 18 on both sides. The first fixed contact 19 and the second fixed contact 20 are opposed to the first movable contact 17 and the second movable contact 18. The sliding portion 16 has a sliding convex portion 15 that is urged in a direction toward the rotation bar 14 and moves by an operation on the operation lever 12, and switches the switch by sliding on the upper portion of the rotation bar 14.

  In the changeover switch 40 described in Patent Document 1, when both ends of the motor M are short-circuited, the motor M stops. When the operating lever 12 is moved to stop the motor M and the sliding portion 16 is moved in the left direction (the direction of the arrow Q1 in FIG. 2 of Patent Document 1), the second movable contact 18 and the second fixed contact 20 are separated. The first movable contact 17 moves in the direction of arrow Q3 in FIG. 2 of Patent Document 1 and is electrically connected to the first fixed contact 19 (in the direction of arrow Q2 in FIG. 2 of Patent Document 1). Further, when the operating lever 12 is moved to move the sliding portion 16 to the right in order to supply the power source E to the motor M, the first movable contact 17 and the first fixed contact 19 are separated and opened (non-contact). State), the second movable contact 18 and the second fixed contact 20 are closed, and are electrically connected via the auxiliary contact 44 and the fixed contact piece 62 (state shown in FIG. 2) to supply power E Supply.

JP-A-11-162285 (paragraphs 0023 to 0034, FIG. 2)

  In the changeover switch 40 described in Patent Document 1, the rotation bar 14 and the sliding portion 16 are in direct contact with each other. The movement is linked. In this regard, as a safety standard for switches, there is a safety standard that requires that the opening / closing speed of the contacts must be independent of the operation speed, and the changeover switch 40 described in Patent Document 1 does not satisfy this requirement.

  The present invention has been made in view of the above points, and an object thereof is to make the operation speed of the seesaw switch independent of the opening / closing speed of the contact.

  The seesaw switch of the present invention includes (a) a fixed contact, (b) a fulcrum portion, (c) a movable contact facing the fixed contact, (d) a length, and the movable contact is at least one of the movable contacts. A first contact piece which is provided at an end portion and is slidably supported by the fulcrum portion on the first side, and swings so that the movable contact is moved close to and away from the fixed contact; (e) The first contact piece is elongated along the longitudinal direction, and has a sliding contact portion in the middle of the first side that slidably contacts the second side opposite to the first side of the first contact piece. A second contact piece that swings about the sliding contact part; and (f) a pressing part that contacts the second side of the second contact piece opposite to the first side with a pressing force. (G) An operation part for moving the pressing part in the longitudinal direction of the second contact piece.

  According to the present invention, when the operating portion is operated to move the pressing portion, first, the second contact piece swings around the sliding contact portion. At this time, the sliding contact portion of the second contact piece slides on the first contact piece. After that, the first contact piece is pushed by the sliding contact portion or the end portion of the second contact piece, and swings around the fulcrum portion while sliding on the fulcrum portion. Thus, in the seesaw switch, there is a time difference between the movement of the operation unit and the opening and closing of the movable contact with respect to the fixed contact, and the operation speed at the seesaw switch and the opening and closing speed of the contact can be made independent.

It is a perspective view of a seesaw switch. It is front sectional drawing of a seesaw switch. It is a disassembled perspective view of a seesaw switch. It is a perspective view of the metal member, the 1st contact piece, and the 2nd contact piece which were mutually assembled. It is a top view of a switch housing in the state where the 1st terminal and the metal member were attached. FIG. 6 is a plan view of the switch housing in a state where the first contact piece and the second contact piece are attached following FIG. 5. It is front sectional drawing which shows the internal structure of the seesaw switch in an OFF state. FIG. 8 is a front cross-sectional view showing the internal structure of the seesaw switch in a state where the on-side region starts to be pressed, following FIG. 7. FIG. 9 is a front cross-sectional view showing the internal structure of the seesaw switch in a state where the on-side region is further pressed down, following FIG. 8. FIG. 10 is a front cross-sectional view showing the internal structure of the seesaw switch in a state where the on-side region is further pressed down following FIG. 9. FIG. 11 is a front cross-sectional view illustrating the internal structure of the seesaw switch in a state where the on-side region is further pressed down, following FIG. 10. FIG. 12 is a front cross-sectional view illustrating the internal structure of the seesaw switch that has been turned on following FIG. 11.

  One embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view of the seesaw switch 101. The seesaw switch 101 includes a switch housing 102, a seesaw body 103 as an operation unit, and an element unit 104 (see FIG. 2 and the like).

  The switch housing 102 is a hollow box having a substantially rectangular parallelepiped shape made of a resin material, and looks like an elongated rectangular shape in plan view. An opening 105 is provided on the upper surface of the switch housing 102. A flange portion 102 a extends outward from the opening 105 around the opening 105 in the switch housing 102. A bearing hole 106 is opened in the vicinity of the flange portion 102a at the approximate center in the longitudinal direction in any of the pair of side portions on the long side of the switch housing 102.

  A latch 107 is provided on either of the pair of side portions on the short side of the switch housing 102. The latch 107 is bent into a “<” shape and protrudes outward from the switch housing 102. An anti-slip portion 107 a is formed on a slope that faces obliquely upward above the outside of the latch 107. The latch 107 has elasticity and bends when the vicinity of the “<”-shaped top portion 107 b is pressed.

  A first terminal 108 and a second terminal 109 protrude from the bottom of the switch housing 102 and are aligned in the longitudinal direction of the switch housing 102. An electric wire (not shown) extending from the electronic device is connected to the first terminal 108 and the second terminal 109.

  The seesaw body 103 is for moving the pressing pin 112 (see FIG. 2) in the longitudinal direction of the second contact piece 117 (see FIG. 2). The seesaw body 103 is inserted from the opening 105 of the switch housing 102 and is inserted into the switch housing 102. Is swingably attached. When the upper left region (off-side region 103p) in FIG. 1 is pressed on the upper surface of the seesaw body 103, the seesaw switch 101 is turned off, and the lower right region (on-side region in FIG. When 103q) is pressed, the seesaw switch 101 is turned on. The seesaw switch 101 shown in FIG. 1 is in an off state.

  A character portion 102b indicating the on / off side of the seesaw switch 101 is formed on the side of the switch housing 102 in the longitudinal direction.

  Inside the switch housing 102, a step portion 102c (see FIG. 2) for receiving the lower end portion of the seesaw body 103 is formed. The stepped portion 102c prevents the off-side region 103p and the on-side region 103q from being pushed too much.

  FIG. 2 is a front sectional view of the seesaw switch 101. FIG. 3 is an exploded perspective view of the seesaw switch 101. The seesaw body 103 has a boat shape and is used with the bottom of the boat shape facing upward. A shaft portion 103 a protrudes from both side surfaces of the seesaw body 103 in the longitudinal direction. The shaft 103a is fitted into a bearing hole 106 provided in the switch housing 102 (see also FIG. 1).

  From the inner bottom surface of the seesaw body 103, the cylindrical portion 103b protrudes downward. A spring 111 and a pressing pin 112 are fitted into the cylindrical portion 103b in this order. At this time, the tip of the pressing pin 112 faces downward. The tip of the pressing pin 112 is rounded so that it can slide on the upper surface side (second side) of the second contact piece 117. The spring 111 pushes the pressing pin 112 downward. The spring 111 and the pressing pin 112 constitute a pressing part 113.

  The element unit 104 switches between electrical connection and disconnection between the first terminal 108 and the second terminal 109 according to an operation on the seesaw body 103, and is housed in the switch housing 102. The element unit 104 includes a fixed contact 114, a movable contact 115, a first contact piece 116, a second contact piece 117, and a fulcrum part 118.

  The fixed contact 114 has a hemispherical shape and is located on the first terminal 108. The first terminal 108 has a plate shape extending in the vertical direction, and is inserted into the bottom of the switch housing 102 from above. The first terminal 108 is formed with a retaining portion 108a. When the first terminal 108 is inserted into the bottom of the switch housing 102, the retaining portion 108 a is not caught by the switch housing 102. As a result, the fixed contact 114 is fixed in the vicinity of the bottom of the switch housing 102 inside the switch housing 102.

  The fulcrum part 118 forms a part of the crank-shaped metal member M1, and is connected to the second terminal 109 that is also formed on a part of the metal member M1. The second terminal 109 has substantially the same shape as the first terminal 108, has a retaining portion 109a, and is fixed to the bottom of the switch housing 102 by being inserted from above. As a result, the fulcrum portion 118 is fixed in the vicinity of the bottom of the switch housing 102 inside the switch housing 102 and is positioned between the first terminal 108 and the second terminal 109.

  The movable contact 115 is provided at one end of the first contact piece 116 having a long plate shape, and is disposed so as to face the fixed contact 114. The first contact piece 116 swings so that the movable contact 115 approaches and separates from the fixed contact 114. A wing portion 119 is provided in the middle of the first contact piece 116. The wing part 119 extends in the width direction (short direction) of the first contact piece 116. The first contact piece 116 is bent upward with each of the edge portions 119a of the pair of wing portions 119 extending in the short direction of the first contact piece 116 as a fold. The other end of the first contact piece 116 is bent downward. The end surface of the other end of the first contact piece 116 serves as a contact portion 120 that contacts the second terminal 109.

  The second contact piece 117 has a long plate shape along the longitudinal direction of the first contact piece 116. A sliding contact portion 121 is provided in the middle of the second contact piece 117. The sliding contact portion 121 is formed by bending a portion extending in the width direction (short direction) of the second contact piece 117 in the middle of the second contact piece 117 and having an outer edge convex in an arc shape. It protrudes to the lower surface side (first side) of the contact piece 117. The second contact piece 117 is provided with a stopper portion 122. The stopper portion 122 is formed by bending both end portions of the second contact piece 117 so as to protrude from the upper surface (second side) of the second contact piece.

  FIG. 4 is a perspective view of the metal member M1, the first contact piece 116, and the second contact piece 117 assembled to each other. FIG. 5 is a plan view of the switch housing 102 in a state where the first terminal 108 and the metal member M1 are attached. FIG. 6 is a plan view of the switch housing 102 with the first contact piece 116 and the second contact piece 117 attached, following FIG. The metal member M1 will be described with reference to FIGS. 1 and 3 to 6. The metal member M1 has a crank shape, and includes the above-described second terminal 109, the above-described fulcrum portion 118, and a connecting portion 123 that connects them. The connecting portion 123 has a long plate shape along the longitudinal direction of the first contact piece 116 and is orthogonal to the second terminal 109. One end of the connecting portion 123 is connected to the upper end of the second terminal 109.

  Two fulcrum portions 118 protrude upward from the other end of the connecting portion 123. The two fulcrum portions 118 are separated in the width direction (short direction) of the connecting portion 123. Each fulcrum part 118 forms a flat part 118a and two inclined parts 118b. The flat portion 118 a is in surface contact with the lower surface side (first side) of the first contact piece 116. The inclined portions 118b are located on both sides in the longitudinal direction of the first contact piece 116 so as to sandwich the flat portion 118a. The inclined portion 118b is inclined with respect to the flat portion 118a so that the flat portion 118a faces up. The boundaries 126R and 126L between the flat portion 118a and the inclined portion 118b are angular. The fulcrum part 118 looks like a trapezoidal shape by the flat part 118a and the two inclined parts 118b.

  Four restricting arms 124 as restricting portions extend upward from the other end of the connecting portion 123. The restriction arm 124 sandwiches the fulcrum part 118 in the longitudinal direction of the connecting part 123. A chamfered portion 125 is formed at the upper end portion of the restriction arm 124 in order to facilitate the operation of introducing the wing portion 119 of the first contact piece 116 and the sliding contact portion 121 of the second contact piece 117 as will be described later. Is done.

  The procedure for assembling the seesaw switch 101 will be described below. First, the first terminal 108 and the metal member M1 are inserted from the opening 105 of the switch housing 102, and the first terminal 108 and the second terminal 109 are inserted into the bottom of the switch housing 102 (FIG. 5). Subsequently, the wing 119 is positioned between the two regulating arms 124 arranged in the longitudinal direction of the switch housing 102, and the first contact piece 116 is introduced from the opening 105 of the switch housing 102. The (first side) is supported by the fulcrum 118. Subsequently, the sliding contact portion 121 is positioned between the two regulating arms 124 arranged in the longitudinal direction of the switch housing 102, the second contact piece 117 is introduced from the opening 105 of the switch housing 102, and the sliding contact portion 121 is moved to the first contact portion 121. The contact piece 116 is brought into contact with the upper surface side (second side) of the wing portion 119 (FIG. 6). Here, the fulcrum portion 118 and the first contact piece 116 are slidable without being fixed, and the first contact piece 116 and the second contact piece 117 are slidable without being fixed. The restricting arm 124 sandwiches the wing part 119 and the sliding contact part 121 to restrict the movement of the first contact piece 116 and the second contact piece 117 in the longitudinal direction. Thereafter, the seesaw body 103 assembled with the spring 111 and the pressing pin 112 is introduced from the opening 105 of the switch housing 102, and the tip of the pressing pin 112 is brought into contact with the upper surface side (second side) of the second contact piece 117. The shaft portion 103 a of the seesaw body 103 is fitted into the bearing hole 106 of the switch housing 102. Thereby, the pressing pin 112 contacts the upper surface side of the second contact piece 117 with a pressing force. Further, the seesaw body 103 can swing about the shaft portion 103a with the shaft portion 103a supported by the bearing hole 106.

  The movement of the element unit 104 when the fixed contact 114 and the movable contact 115 are opened and closed by the seesaw switch 101 will be described with reference to FIGS. FIG. 7 is a front sectional view showing the internal structure of the seesaw switch 101 in the off state. In the off state, the off-side region 103p of the seesaw body 103 is pressed, and the lower end portion on the left side of the seesaw body 103 in FIG. 7 is received by the stepped portion 102c. Further, both the first contact piece 116 and the second contact piece 117 are pushed by the pressing pin 112 and are inclined so that the right side in FIG. 7 is downward, and the fixed contact 114 and the movable contact 115 are separated from each other. Yes. At this time, the sliding contact portion 121 of the second contact piece 117 and the right end portion 117R of the second contact piece 117 in FIG. 7 are in contact with the upper surface side (second side) of the first contact piece 116. . The lower surface of the first contact piece 116 is supported by a boundary 126R (a boundary between the flat portion 118a at the fulcrum portion 118 and the right inclined portion 118b in FIG. 7). Further, the second contact piece 117 is pushed by the pressing pin 112 and approaches the right side in FIG. 7, and the right end of the sliding contact portion 121 of the second contact piece 117 is in contact with the restriction arm 124. Further, the first contact piece 116 is pushed by the second contact piece 117 and approaches the right side in FIG. 7, and the right end of the wing portion 119 of the first contact piece 116 is in contact with the restriction arm 124. Further, the contact portion 120 of the first contact piece 116 is in contact with the second terminal 109.

  FIG. 8 is a front cross-sectional view showing the internal structure of the seesaw switch 101 in a state where the on-side region 103q starts to be pressed, following FIG. When the on-side region 103q of the seesaw body 103 is pressed in order to turn on the seesaw switch 101, the pressing pin 112 slides on the upper surface side (second side) of the second contact piece 117, as shown in FIG. Move to the left. Accordingly, the second contact piece 117 is pushed by the pressing pin 112 and moves to the left in FIG. 8, and the left end of the sliding contact portion 121 of the second contact piece 117 comes into contact with the restriction arm 124. Thereafter, the first contact piece 116 is pushed by the second contact piece 117 and starts to move to the left in FIG. 8 with a time difference.

  FIG. 9 is a front sectional view showing the internal structure of the seesaw switch 101 in a state where the on-side region 103q is further pressed down, following FIG. The left lower end of the seesaw body 103 in FIG. 9 is separated from the stepped portion 102c. Further, when the on-side region 103q is further pressed, the first contact piece 116 further moves to the left side in FIG. 8, and the left end of the wing portion 119 of the first contact piece 116 contacts the restriction arm 124. Further, the pressing pin 112 slides on the upper surface side (second side) of the second contact piece 117 and moves to the left side in FIG. As a result, the restricting arm 124 interferes with the sliding contact portion 121 of the second contact piece 117 to restrict the movement of the second contact piece 117 in the longitudinal direction, and the second contact piece 117 swings around the sliding contact portion 121. Then, the right end 117 </ b> R of the second contact piece 117 is separated from the upper surface side of the first contact piece 116. At this time, the sliding contact portion 121 of the second contact piece 117 remains in contact with the upper surface side (second side) of the first contact piece 116. Further, the contact portion 120 of the first contact piece 116 remains in contact with the second terminal 109.

  FIG. 10 is a front sectional view showing the internal structure of the seesaw switch 101 in a state where the on-side region 103q is further pressed down, following FIG. When the on-side region 103q of the seesaw body 103 is further pressed, the pressing pin 112 slides further on the upper surface side (second side) of the second contact piece 117 to the left side in FIG. At this time, the left end of the sliding contact portion 121 of the second contact piece 117 remains in contact with the restriction arm 124. When the pressing pin 112 slides, the restricting arm 124 interferes with the sliding contact portion 121 of the second contact piece 117 and restricts the movement of the second contact piece 117 in the longitudinal direction, and the second contact piece 117 slides. Further, the left end 117 </ b> L of the second contact piece 117 in FIG. 10 approaches the upper surface side (second side) of the first contact piece 116. The first contact piece 116 rotates around the boundary 126R, and the lower surface side (first side) of the first contact piece 116 is in surface contact with the flat portion 118a of the fulcrum 118. Further, the contact portion 120 of the first contact piece 116 is separated from the second terminal 109.

  FIG. 11 is a front sectional view showing the internal structure of the seesaw switch 101 in a state where the on-side region 103q is further pressed down, following FIG. When the on-side region 103q of the seesaw body 103 is further pressed, the pressing pin 112 slides further on the upper surface side (second side) of the second contact piece 117 to the left side in FIG. Thereby, the second contact piece 117 further swings around the sliding contact portion 121 and tilts so that the left side in FIG. The lower surface side (first side) of the first contact piece 116 starts to rotate around the boundary 126L (the boundary between the flat portion 118a in the fulcrum portion 118 and the left inclined portion 118b in FIG. 11) with a time difference, and the fulcrum. It leaves | separates from the flat part 118a of the part 118. FIG.

  FIG. 12 is a front sectional view showing the internal structure of the seesaw switch 101 that has been turned on following FIG. When the on-side region 103q of the seesaw body 103 is further pressed, the lower end portion on the right side of the seesaw body 103 in FIG. 12 is received by the stepped portion 102c. Further, the second contact piece 117 is pushed by the pressing pin 112 and is inclined so that the left side in FIG. 12 is downward, and the sliding contact portion 121 of the second contact piece 117 and the left side of the second contact piece 117 in FIG. Both of the end portions 117L are in contact with the upper surface side (second side) of the first contact piece 116. The first contact piece 116 further rotates around the boundary 126L, tilts so that the left side in FIG. 12 is downward, the movable contact 115 contacts the fixed contact 114, and the seesaw switch 101 is turned on. In the ON state, if there is a potential difference between the first terminal 108 and the second terminal 109, the current flows through the connecting portion 123, the fulcrum portion 118, the first contact piece 116, the movable contact 115, and the fixed contact 114 in this order. It flows in the reverse order.

  When the seesaw switch 101 is changed from the on state to the off state, the off-side region 103p of the seesaw body 103 is pressed. Accordingly, the pressing pin 112 slides the upper surface side (second side) of the second contact piece 117 to the right side in FIGS. 7 to 12, and the first contact piece 116 is pushed by the second contact piece 117. 7 to 12, the movable contact 115 is moved away from the fixed contact 114 and the contact portion 120 contacts the second terminal 109. Even when the on state is changed to the off state, the restriction arm 124 interferes with the sliding contact portion 121 of the second contact piece 117 to restrict the movement of the second contact piece 117 in the longitudinal direction, and the first contact piece. The movement of the longitudinal direction of the 1st contact piece 116 is controlled by interfering with the wing | blade part 119 of 116. FIG.

  As described above, in the seesaw switch 101 according to the present embodiment, when the seesaw body 103 is operated to move the pressing pin 112, first, the second contact piece 117 swings around the sliding contact portion 121. At this time, the sliding contact portion 121 of the second contact piece 117 slides on the first contact piece 116. After that, the first contact piece 116 is pushed by the sliding contact portion 121 and the end portions 117R and 117L of the second contact piece 117 and swings around the fulcrum portion 118 while sliding on the fulcrum portion 118. To do. As described above, in the seesaw switch 101 of the present embodiment, there is a time difference between the movement of the seesaw body 103 and the opening and closing of the movable contact 115 with respect to the fixed contact 114, and the operation speed and contact opening / closing speed of the seesaw switch 101 are reduced. Can be independent.

  Further, in the seesaw switch 101 of the present embodiment, the restriction arm 124 restricts the movement of the first contact piece 116 and the second contact piece 117 in the longitudinal direction. For this reason, even if the 1st contact piece 116 and the 2nd contact piece 117 are pushed by the press pin 112, they do not leave | separate from the fulcrum part 118. FIG.

  Further, in the seesaw switch 101 of the present embodiment, the stopper portion 122 protrudes from both end portions of the second contact piece 117. In general, in a seesaw switch, the fixed contact 114 and the movable contact 115 may be welded due to overcurrent or the like. Further, the second terminal 109 and the contact portion 120 of the first contact piece 116 may be welded due to overcurrent or the like. In the present embodiment, even if the first contact piece 116 does not move due to such an abnormal state, the seesaw body 103 moves and the tip of the pressing pin 112 abuts against the stopper portion 122. Dropping is prevented. Further, by applying a large force to the seesaw body 103 and moving the stopper portion 122 with the pressing pin 112, the first contact piece 116 and the first terminal 108 are welded, and the first contact piece 116 and the second terminal 109 are Can be peeled off. In the present embodiment, such a stopper portion 122 is formed by bending the second contact piece 117.

  Further, in the seesaw switch 101 of the present embodiment, the fulcrum part 118 is formed in a trapezoidal shape, and the first contact piece 116 makes surface contact with the flat part 118a or rotates around the boundaries 126R and 126L as the rotation center. For this reason, the movement of the first contact piece 116 according to the operation of the seesaw body 103 is stabilized, and the contact and separation of the movable contact 115 with respect to the fixed contact 114 are ensured.

101 Seesaw switch 103 Seesaw body (operation unit)
DESCRIPTION OF SYMBOLS 113 Press part 114 Fixed contact 115 Movable contact 116 1st contact piece 117 2nd contact piece 118 Support point part 118a Flat part 118b Inclination part 121 Sliding contact part 122 Stopper part 124 Restriction arm (regulation part)

Claims (4)

A fixed contact;
A fulcrum part,
A movable contact facing the fixed contact;
It is long and has the movable contact at at least one end, and is slidably supported by the fulcrum on the middle of the first side so that the movable contact is moved close to and away from the fixed contact. A moving first contact piece;
A sliding contact portion that is long along the longitudinal direction of the first contact piece and that slidably contacts a second side opposite to the first side of the first contact piece is formed in the middle of the first side. A second contact piece that swings about the sliding contact portion;
A pressing portion that contacts the second side of the second contact piece opposite to the first side with a pressing force;
An operation part for moving the pressing part in the longitudinal direction of the second contact piece;
Seesaw switch equipped with. A regulation part for regulating movement of at least one of the first contact piece and the second contact piece in the longitudinal direction;
The seesaw switch according to claim 1. A stopper portion provided at both ends of the second contact piece and protruding to the second side of the second contact piece;
The seesaw switch according to claim 1 or 2. The fulcrum part is
A flat portion in surface contact with the first side of the first contact piece;
An inclined portion that is located on both sides in the longitudinal direction of the first contact piece so as to sandwich the flat portion, and is inclined with respect to the flat portion;
The seesaw switch according to any one of claims 1 to 3, wherein the seesaw switch is formed.

Images