JP5026379B2 - Switch device - Google Patents

Description

  The present invention relates to a switch device, and more particularly to a switch device including a snap action mechanism that operates in response to a pressing operation on an operation member.

2. Description of the Related Art Conventionally, there has been known a switch device that includes a snap action mechanism and rotates a movable contact in accordance with a pressing operation with respect to an operation lever that is a component thereof, and switches a fixed contact with which the movable contact contacts (for example, Patent Literature 1). In this switch device, the operation lever is configured to be able to rotate with a fulcrum provided at the tip of the operation lever in contact with a support projecting from the insulating base, and using the fulcrum as a rotation fulcrum.
JP 2008-66082 A

  However, in the conventional switch device described above, since the support body that rotatably supports the operation lever is formed of a resin material, the support body is deformed when the operation lever is rotated over a long period of time. there is a possibility. In this case, the rotation operation of the operation lever becomes unstable, and it is difficult to appropriately rotate the movable contact, and there is a problem that it is impossible to switch the fixed contact with which the movable contact contacts with high accuracy.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a highly reliable switch device capable of accurately switching a fixed contact with which a movable contact contacts over a long period of time.

  The switch device according to the present invention includes a housing having a storage portion, an operation member that receives a pressing operation, a fixed contact made up of a metal common contact and a metal switching contact that is erected in the storage portion, and the switching contact. And a snap action mechanism that drives the movable contact when the operation member is pressed to a predetermined position. The snap action mechanism is provided with the movable contact on one end side. On the other hand, a conductive first driving body having a fulcrum portion that forms a rotation fulcrum by contacting the common contact on the other end side, and a pressed portion pressed by the operating member on one end side. The second drive in which a fulcrum portion that forms a pivot fulcrum is formed on the other end side while abutting a part of the common contact side of the metal support erected in the storage portion on the other end side When, and having a said first driving body part and pulling the end portions and a portion of the second driving body is mounted a spring.

  According to the switch device, the fulcrum part constituting the rotation fulcrum of the first drive body is supported by a part of the common contact, while the fulcrum part constituting the rotation fulcrum of the second drive body is supported by the metal support body. Since the support is partially provided, it is possible to prevent the support body from being deformed with the rotation of the second drive body. For this reason, the second driving body can be stably rotated, and the first driving body can be appropriately rotated along with the rotation of the second driving body. It is possible to provide a highly reliable switch device that can switch the fixed contact with which the contact is made with high accuracy.

  In the switch device, it is preferable that the support is formed of a plate-like member, and a fulcrum portion of the second drive body is supported by a part of an end surface of the plate-like member. In this case, since the fulcrum portion of the second driving body can be more firmly supported by a part of the end surface of the plate-like member that constitutes the support body, the fixed contact with which the movable contact contacts for a longer period of time. It is possible to provide a highly reliable switching device that can switch between the two with high accuracy.

  In the switch device, the support is disposed between the common contact and the switching contact, and the switching contact and the support are erected on the same straight line with a resin portion interposed therebetween, It is preferable that the contact portion of the movable contact is brought into sliding contact with the switching contact. In this case, since the biasing force of the tension spring applied to the support via the second driving body is also received by the resin portion and the switching contact, the support can be reinforced by the resin portion and the switching contact. Further, it is possible to prevent the position of the support body from being shifted by the biasing force of the tension spring applied via the second drive body. In addition, since the contact portion of the movable contact is in sliding contact with the switching contact, the movable contact has a self-cleaning function, and even when used with a minute current, dust, contact surface sulfide, oxide film, Since a contact failure due to the influence of siloxane gas or the like is less likely to occur, it is possible to provide a switch device having a long life and high reliability.

  Further, in the above switch device, it is preferable that the contact portion of the movable contact has a shape for sandwiching the switching contact. In this case, the sliding contact between the contact portion of the movable contact and the switching contact can be stabilized, and the reliability at the time of switching the fixed contact with which the movable contact contacts can be improved.

  Further, in the above switch device, the movable contact is formed by bending an elastic metal plate, is located below the first driving body, and is provided with an opening portion and arranged opposite to each other. First and second connections that are arranged at a distance from each other, and one of which is connected to the tip of the first drive body and connects the first and second bases on the upper side. And first and second contact portions provided so as to protrude upward from the first and second base portions so as to face each other at a position between the first and second connecting portions. It is preferable. In this case, the switching contact can be appropriately held between the first and second contact portions by utilizing the space between the first and second base portions formed by the first and second connecting portions, respectively. In addition, the first and second connecting portions that connect the first and second base portions on the upper side can function as a spring span, so that the sliding between the first and second contact portions and the switching contact is possible. It is possible to stabilize the contact.

  In the switch device, the switching contact includes a first switching contact and a second switching contact that are spaced apart from each other along a rotation direction of the movable contact with an insulating portion interposed therebetween, and the first switching contact. The contact constitutes a normally closed contact, and has a regulating piece that contacts a part of the movable contact and regulates the movement of the movable contact on a part of the common contact side, and a part of the movable contact is It is preferable that the position in contact with the restriction piece is the initial position of the movable contact. In this case, since the movement of the movable contact can be restricted by using a part of the first switching contact and can be arranged at the initial position, the movable contact can be surely placed at the initial position without providing a special component. It becomes possible to arrange in.

  Furthermore, in the switch device, the second switching contact and the movable member are moved to the second switching contact on the side where the contact portion of the movable contact moves in response to the pressing operation on the operating member. It is preferable that an arc contact portion for generating an arc is provided prior to contact with the contact portion of the contact, and an arc contact portion that is in sliding contact with the arc contact portion is provided on the movable contact. In this case, since the arc contact portion and the arc contact portion that come into contact with each other are provided prior to the contact with the sliding contact portion in the contact portion, the wear of the contact portion due to the occurrence of the arc is avoided and the current exceeds the current. The switch device can be used even in an environment.

  According to the present invention, the fulcrum part constituting the rotation fulcrum of the first drive body is supported by a part of the common contact, while the fulcrum part constituting the rotation fulcrum of the second drive body is a part of the metal support. Since it is supported by the portion, it is possible to prevent the support body from being deformed along with the turning operation of the second drive body. For this reason, the second driving body can be stably rotated, and the first driving body can be appropriately rotated along with the rotation of the second driving body. It is possible to provide a highly reliable switch device that can switch the fixed contact with which the contact is made with high accuracy.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an appearance of a switch device 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the switch device 1 according to the present embodiment. As shown in FIG. 1, the switch device 1 according to the present embodiment projects a part of an operation member 5 to be described later from a part of the upper surface of a box-shaped housing 2, and an operator or the like at the projecting part It is comprised so that pressing operation may be received. A cover 3 for preventing entry of foreign matter such as dust and water into the housing 2 is attached to a part of the operation member 5 protruding from the housing 2.

  As shown in FIG. 2, the switch device 1 includes a housing 2 formed by molding an insulating resin material, for example. The housing 2 includes an upper case 21 having a box shape opened to the lower side, and a lower case 22 having a shape corresponding to the opening of the upper case 21 and constituting the inner bottom surface of the switch device 1. By combining the upper case 21 and the lower case 22, a housing portion that houses the components of the switch device 1 is formed inside the housing 2.

  On the upper surface of the upper case 21, an opening 211 is formed through which an upper end portion of a shaft portion 52 of the operation member 5 described later can pass. Further, on the upper surface of the case 2 and around the opening 211, a groove portion 212 into which the outer edge portion of the cover 3 described above is fitted is formed. The lower case 22 has a rectangular shape in plan view, and a protruding surface 221 having a shape corresponding to the opening of the upper case 21 is provided on the upper surface thereof. The upper case 21 is appropriately positioned by accommodating the protruding surface 221 with an opening. Further, the protruding surface 221 is provided with a protruding piece 222 as a resin portion and an insulating piece 223 as an insulating portion, which are formed when insert molding the fixed contact 4 described later, and protrude upward.

  The storage portion formed in the housing 2 is provided with a fixed contact 4 fixed to the lower case 22 and operates according to a pressing operation on the operating member 5 that receives a pressing operation by an operator or the like. The snap action mechanism 6 is accommodated. As will be described in detail later, the snap action mechanism 6 includes a first drive body 8 to which the movable contact 7 is attached, a second drive body 9 whose one end is pressed by the operation member 5, and the first drive body 8, The second drive body 9 is composed of a tension spring 10 having both ends attached thereto.

  The fixed contact 4 has a metal common contact 41 and a metal switching contact 42 which are insert-molded in the lower case 22. The common contacts 41 are arranged in the short-side direction of the lower case 22, and contact portions 411a and 411b that come into contact with fulcrum portions 83a and 83b of the first driver 8 described later, and lower ends of these contact portions 411a and 411b. And a terminal portion 412 which is bent to the opposite side to the switching contact 42 and extends downward from the end portion thereof. The contact portion 411b is bent toward the contact portion 411a at the lower end portion and is connected to the vicinity of the lower end portion of the contact piece 411a.

  The switching contact 42 includes a first switching contact 421 disposed outside the insulating piece 223 of the lower case 22 and a second switching contact 422 disposed between the protruding piece 222 and the insulating piece 223. . In the present embodiment, the first switching contact 421 and the second switching contact 422, the protruding piece 222 and the insulating piece 223 are arcuate along the rotational direction of the movable contact 7. The first switching contact 421 extends upward and extends along the long side direction of the lower case 22 at the upper end thereof, and the sliding contact portion 423 with which the movable contact 7 is in sliding contact with the sliding contact portion 423. And a terminal portion 424 extending downward from the lower end portion.

  The second switching contact 422 extends upward at the inner portion of the first switching contact 422, and is bent toward the common contact 41 from the sliding contact portion 425 where the movable contact 7 is in sliding contact, and the lower end portion of the sliding contact portion 425, And a terminal portion 426 extending downward from the end portion. In this case, the sliding contact portion 425 of the second switching contact 422 is disposed on the lower side of the sliding contact portion 423 of the first switching contact 421, and the upper end portion thereof is a position near the lower end portion of the sliding contact portion 423. Is arranged.

  In the switch device 1 according to the present embodiment, the first switching contact 421 constitutes a normally closed contact, while the second switching contact 422 constitutes a normally open contact. When the first and second contact portions 75a and 75b of the movable contact 7 to be described later are in contact with the sliding contact portion 423, the first switching contact 421 as the normally closed contact and the common contact 41 are electrically connected. When the first and second contact portions 75a and 75b of the movable contact 7 come into contact with the sliding contact portion 425, the circuit is switched to a circuit in which the second switching contact 422 and the common contact 41 as normal open contacts are made conductive. It is configured.

  Between the common contact 41 and the second switching contact 422, the support 11 made of a metal plate member is disposed. The support 11 is disposed on the same line as the first switching contact 421 and the second switching contact 422, and is insert-molded in the lower case 22 so that the upper end of the support 11 protrudes. A fulcrum portion 93 of a second driving body 9 to be described later is brought into contact with the end surface of the support body 11 to support it. In the present embodiment, the support 11 has an arc shape.

  The operation member 5 is formed by molding, for example, an insulating resin material, and includes a generally rectangular pressing portion 51 and a columnar shaft portion 52 erected on the upper surface of the pressing portion 51. Yes. The pressing unit 51 presses one end of the second drive body 9 in response to a pressing operation on the operating member 5. A housing portion 511 that houses one end of the second drive body 9 is provided on the lower surface of the pressing portion 51. The shaft portion 52 is disposed with its upper end protruding from the opening 211 of the upper case 21 and receives a pressing operation. In the vicinity of the upper end portion of the shaft portion 52, a groove portion 521 is formed on the outer periphery thereof. In the groove portion 521, the inner edge portion of the hole 31 formed on the upper surface of the cover 3 described above is disposed.

  Here, the structure of the principal part of the switch apparatus 1 which concerns on this Embodiment is demonstrated. 3 and 4 are a perspective view and a side sectional view of the lower case 22 to which the fixed contact 4 and the support 11 are fixed in the switch device 1 according to the present embodiment. FIG. 5 is a perspective view of the movable contact 7 and the first driver 8 included in the switch device 1 according to the present embodiment. FIG. 6 is a side view (FIG. 6 (a)) and a top view (FIG. 6 (b)) of the movable contact 7 and the first driver 8 included in the switch device 1 according to the present embodiment. FIG. 7 is a perspective view of the second driver 9 included in the switch device 1 according to the present embodiment.

  As shown in FIGS. 3 and 4, the fixed contact 4 and the support 11 are embedded in a state in which a part thereof protrudes from the protruding surface 221 along the long side direction of the lower case 22. The common contact 41 includes a pair of contact portions 411a and 411b and is disposed in a state in which a portion that is generally U-shaped is projected. In the switching contact 42, the first switching contact 421 is disposed at a position sandwiching the insulating piece 223 between the first switching contact 421 and the second switching contact 422. The second switching contact 422 is disposed at a position between the insulating piece 223 and the protruding piece 222. The support 11 is disposed at a position spaced apart from the common contact 41 by a certain distance and corresponding to a part of the end surface of the protruding piece 222 on the common contact 41 side.

  These fixed contacts 4 and the support 11 are insert-molded when the lower case 22 is manufactured. The first switching contact 421, the insulating piece 223, the second switching contact 422, the protruding piece 222, and the support body 11 are arranged on the same straight line (same plane) and are in close contact with each other at adjacent portions. . For this reason, the sliding contact portion 423 of the first switching contact 421 and the sliding contact portion 425 of the second switching contact 422 are separated from each other with the insulating piece 223 interposed therebetween. The contact portions 411a and 411b of the common contact 41 are arranged on a straight line orthogonal to a straight line passing through the support 11 from the first switching contact 421.

  Concave portions 413a and 413b are formed in portions slightly above the central portion on the support 11 side in the contact portions 411a and 411b of the common contact 41. These concave portions 413a and 413b are portions for accommodating fulcrum portions 83a and 83b of the first driving body 8 to be described later. By accommodating the fulcrum portions 83a and 83b of the first drive body 8 with these concave portions 413a and 413b, the contact portions 411a and 411b support the first drive body 8 in a rotatable manner.

  A recess 111 is formed in the upper portion of the end surface of the support 11 on the common contact 41 side. The concave portion 111 is a portion that accommodates a fulcrum portion 93 of the second driving body 9 described later. By accommodating the fulcrum part 93 of the second drive body 9 in the recess 111, the support body 11 supports the second drive body 9 in a rotatable manner. In addition, this recessed part 111 is arrange | positioned in the position below the recessed part 413a, 413b provided in contact part 411a, 411b.

  An arc contact portion 425a for generating an arc at the upper end of the sliding contact portion 425 of the second switching contact 422 prior to contact with the first and second contact portions 75a and 75b of the movable contact 7 described later. Is provided. The arc contact portion 425 a is provided by projecting a part of the sliding contact portion 425 to the insulating piece 223, and the first and second contact portions 75 a and 75 b of the movable contact 7 are in contact with the sliding contact portion 425. It is comprised so that it may contact with the 1st, 2nd arc contact part 76a, 76b of the movable contact 7 mentioned later before doing.

  An end of the sliding contact portion 423 of the first switching contact 421 on the common contact 41 side is in contact with a part of the movable contact 7 to place the first driving body 8 in an initial position (a position where no pressing operation is performed). ) Is provided. The restricting piece 423a is provided so as to extend toward the common contact 41 side from the end of the insulating piece 223, and is configured to contact a first connecting portion 73 of the movable contact 7 described later.

  As shown in FIGS. 5 and 6, the movable contact 7 and the first driving body 8 are formed by punching and bending a metal plate having elasticity and conductivity. The movable contact 7 is provided at one end of the first drive body 8 and is configured to move integrally with the first drive body 8. The movable contact 7 has first and second bases 71 and 72 that are disposed opposite to each other by providing an opening 77 that opens to the lower side, and that extend at a position on the lower side of the first driver 8. ing. First and second connecting portions 73 and 74 are provided at both ends of the first and second base portions 71 and 72 to connect them to each other on the upper side. The first and second connecting portions 73 and 74 are each formed by being bent into a U shape. The movable contact 7 is fixed to the first driving body 8 by the connecting portion 73.

  First and second contact portions 75a and 75b and first and second arc contact portions 76a and 76b are provided so as to protrude upward from the upper end portions of the first and second base portions 71 and 72, respectively. The first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b provided on the first and second base portions 71 and 72 are arranged to face each other with a space therebetween. In the meantime, the switching contact 42 and the insulating piece 223 are configured to be accommodated. The tips of the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b are curved inwardly, and a part thereof is in sliding contact with the switching contact 42 and the insulating piece 223. It is possible. The first and second arc contact portions 76a and 76b are provided slightly longer than the first and second contact portions 75a and 75b.

  The first driving body 8 includes a base portion 81 having a generally rectangular shape and a pair of arm portions 82a and 82b extending from the base portion 81 to the side opposite to the movable contact 7, and has a generally Y-shape. Yes. A hole 81 a to which one end of the tension spring 10 is attached is formed in the central portion of the base 81. The movable contact 7 is provided at the end of the base 81 where the arms 82a and 82b are not provided. At the end portions of the arm portions 82a and 82b, fulcrum portions 83a and 83b are provided. These fulcrum portions 83a and 83b are in contact with the concave portions 413a and 413b provided in the contact portions 411a and 411b described above, and constitute a rotation fulcrum of the first driving body 8.

  In the switch device 1 according to the present embodiment, the case where the movable contact 7 and the first driver 8 are formed from the same metal plate has been described. It is good also as a structure which attaches the movable contact 7 to the edge part of the 1 drive body 8. FIG.

  The second driver 9 is formed by machining a metal material, for example. As shown in FIG. 7, the second driving body 9 has a generally long shape. One end side of the second driving body 9 is bent upward and constitutes a pressed portion 91 that receives the pressing force of the operating member 5 at its upper end portion. An opening 92 is provided in a lower portion of the pressed portion 91. The opening 92 is attached to the other end of the tension spring 10 having one end attached to the hole 81a of the first driver 8. A part of the other end of the tension spring 10 attached to the opening 92 is locked by a recess 91 a provided in the pressed part 91. Further, a fulcrum portion 93 is provided at the end of the second driving body 9 opposite to the pressed portion 91. The fulcrum portion 93 abuts on the concave portion 111 of the support body 11 described above, and constitutes a rotation fulcrum of the second drive body 9. The second driving body 11 is not limited to a metal material, and may be made of a material having rigidity.

  The switch device 1 according to the present embodiment is configured such that the first drive body 8 and the second drive body 9 having such a configuration are assembled to the lower case 22 in the state shown in FIG. Hereinafter, an example of the operation when the first driving body 8 and the second driving body 9 are assembled to the lower case 22 in the state shown in FIG. 3 will be described.

  When the first driver 8 and the second driver 9 are assembled to the lower case 22 in the state shown in FIG. 3, first, one end of the tension spring 10 is attached to the first driver 8. The sliding contact portion 423 of the first switching contact 421 is between the first connecting portion 73 of the movable contact 7 and the second connecting portion 74, and the first and second contact portions 75a, 75b and the first, The first driving body 8 is disposed so as to be disposed between the second arc contact portions 76a and 76b. At this time, the first driving body 8 is arranged so that the first connecting portion 73 of the movable contact 7 is positioned below the restriction piece 423a. Then, the fulcrum portions 83 a and 83 b of the first driving body 8 are brought into contact with the concave portions 413 a and 413 b of the contact portions 411 a and 411 b of the common contact 41. Thereafter, in the region below the first drive body 8, the second drive body 9 is arranged so as to pass between the contact portions 411 a and 411 b of the common contact 41, and the fulcrum portion 93 is disposed on the support body 11. It abuts on the recess 111. The other end of the tension spring 10 of the second driving body 9 in this state is attached.

  As described above, when the fulcrum parts 83a and 83b are brought into contact with the recesses 413a and 413b, and the hand is released in a state where the fulcrum part 93 is brought into contact with the recess 111, the urging force attracting each other by the tension spring 10 acts. The driving body 8 and the second driving body 9 are rotatably held at the fulcrum parts 83a and 83b and the fulcrum part 93, respectively. In the switch device 1, the snap action mechanism 6 is configured by the first drive body 8, the second drive body 9, and the tension spring 10 in the state assembled to the lower case 22 in this manner.

  Here, the configuration of the lower case 22 to which the snap action mechanism 6 is assembled in this way will be described with reference to FIGS. 8 and 9. FIG. 8 is a perspective view of the lower case 22 in which the snap action mechanism 6 is assembled in the switch device 1 according to the present embodiment. FIG. 9 is a side view (FIG. 9 (a)) and a top view (FIG. 9 (b)) of the lower case 22 in which the snap action mechanism 6 is assembled in the switch device 1 according to the present embodiment.

  As shown in FIGS. 8 and 9, in the state assembled to the lower case 22, the first drive body 8 is held in the state of facing upward toward the left side shown in the figure, while the second drive body 9 is held in a state of facing upward toward the right side shown in FIG. The movable contact 7 provided at the left side end portion shown in FIGS. 8 and 9 of the first driving body 8 extends to the upper left side shown in the drawing, and the first and second contact portions 75a thereof. , 75b and the first and second arc contact portions 76a, 76b are in sliding contact with the sliding contact portion 423 of the first switching contact 422.

  In this case, the first connecting portion 73 of the movable contact 7 is in contact with the lower surface of the regulating piece 423a of the sliding contact portion 423 of the first switching contact 421. Thereby, the movable contact 7 is in a state in which the upward rotation is restricted. In the switch device 1 according to the present embodiment, this state is the initial state of the snap action mechanism 6.

  Further, as shown in FIG. 9B, the movable contact 7 holds the sliding contact portion 423 between the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b. Placed in position. The tension spring 10 is attached to a hole 81 a formed in the base portion 81 of the first drive body 8 and an opening 92 of the second drive body 9, and a pair of arm portions 82 a and 82 b of the first drive body 8. Are arranged at corresponding positions. For this reason, even when the 1st drive body 8 rotates according to pressing operation with respect to the operation member 5, the tension spring 10 does not inhibit the rotation operation.

  In the switch device 1 according to the present embodiment, the upper case 21 is attached to the lower case 22 to which the snap action mechanism 6 is assembled in this manner in a state where the operation member 5 is disposed in the storage portion. Here, the internal configuration of the switch device 1 according to the present embodiment will be described. FIG. 10 is a side sectional view for explaining the internal configuration of the switch device 1 according to the present embodiment.

  As shown in FIG. 10, the operating member 5 accommodates the pressed portion 91 of the second driving body 9 in the accommodating portion 511 provided on the lower surface of the pressing portion 51 and allows the shaft portion 52 to pass through the opening 211. In a state of being placed, it is disposed in a storage portion in the housing 2. A cover 3 having an outer edge provided at the lower end thereof attached to the groove 212 is attached to the shaft 52 protruding from the opening 211. Note that the upper end portion of the shaft portion 52 protrudes from the hole 31 of the cover 3.

  In the switch device 1 according to the present embodiment, when a pressing operation is received by the operation member 5 arranged on the pressed portion 91 in this way, the pressed portion 91 is pushed downward. Accordingly, the second drive body 9 rotates in the direction of arrow A with the fulcrum portion 93 as a rotation fulcrum against the urging force of the tension spring 10. On the other hand, when the pressing operation on the operation member 5 is released, the fulcrum portion 93 is rotated in the direction of the arrow B with the fulcrum portion 93 as a rotation fulcrum according to the urging force of the tension spring 10. In this case, the first drive body 8 is rotated in the directions of arrows C and D with the fulcrum portions 83a and 83b as rotation fulcrums according to the rotation position of the second drive body 9.

  Hereinafter, the operation | movement accompanying the press operation with respect to the operation member 5 in the switch apparatus 1 which concerns on this Embodiment is demonstrated. FIGS. 11-13 is a side view for demonstrating the operation | movement accompanying the press operation with respect to the operation member 5 in the switch apparatus 1 which concerns on this Embodiment. 11 to 13, the upper case 21, the cover 3, and the operation member 5 are omitted for convenience of explanation.

  In a state where the pressing operation is not performed on the operation member 5 (initial state), the switch device 1 is in the state shown in FIG. In this case, the movable contact 7 extends to the upper left side shown in FIG. 9A, and the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b are provided. The sliding contact portion 423 of the first switching contact 421 is sandwiched and brought into sliding contact. In this case, the circuit having the first switching contact 421 as the normally closed contact and the common contact 41 is in a conductive state.

  When the pressing operation is received by the operation member 5 and the pressed portion 91 is pushed downward, the second driving body 9 rotates the fulcrum portion 93 against the urging force of the tension spring 10 as shown in FIG. It rotates in the direction of arrow A as a moving fulcrum. However, until the second drive body 9 rotates to the predetermined limit position, the first drive body 8 remains stopped at the initial position (position shown in FIG. 9). Accordingly, the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b of the movable contact 7 are maintained in a state of sliding contact with the sliding contact portion 423. In addition, in FIG. 11, it has shown about the state of the 2nd drive body 9 just before reaching a predetermined limit position.

  When the second drive body 9 rotates to a predetermined limit position, the direction of the biasing force of the tension spring 10 acting on the first drive body 8 and the second drive body 9 is reversed, and the first drive body 8 is moved downward. As shown in FIG. 12, the first driving body 8 instantaneously rotates in the direction of arrow C with the fulcrum portions 83a and 83b as rotation fulcrums. In this case, the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b of the movable contact 7 pass through the insulating piece 223 and are in sliding contact with the sliding contact portion 425. Become. As a result, the circuit having the second switching contact 422 as the normally open contact and the common contact 41 is switched to a conductive state.

  In the switch device 1 according to the present embodiment, when the movable contact 7 rotates as described above, the first and second contact portions 75a and 75b are first contacted with the sliding contact portion 425. 1 and 2nd arc contact part 76a, 76b contacts the arc contact part 425a. Thus, prior to the contact of the first and second contact portions 75a and 75b with the sliding contact portion 425, the arc contact portion 425a and the first and second arc contact portions 76a and 76b that are in contact with each other are provided. Therefore, the switch device 1 can be used even in an environment with a medium current or higher. That is, when an arc is generated by use in an environment of medium current or higher, the first and second arc contact portions 76a and 76b are consumed by this, and the first and second contact portions for circuit switching are consumed. The situation where 75a and 75b are consumed can be avoided. As a result, a situation in which the switching accuracy of the fixed contact 4 with which the movable contact 7 comes into contact due to wear of the first and second contact portions 75a and 75b can be prevented. The switch device 1 can be used.

  On the other hand, when the pressing operation with respect to the operation member 5 is released from the state shown in FIG. 12, the second drive body 9 has the fulcrum 93 as a rotation fulcrum according to the urging force of the tension spring 10 as shown in FIG. Rotates in the direction of arrow B. However, the first drive body 8 remains stopped at the position shown in FIG. 12 until the second drive body 9 rotates to the predetermined limit position. Accordingly, the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b of the movable contact 7 are maintained in a state of sliding contact with the sliding contact portion 425. FIG. 13 shows the state of the second drive body 9 immediately before reaching the predetermined limit position.

  Then, when the second driving body 9 rotates to the predetermined limit position, the direction of the urging force of the tension spring 10 acting on the first driving body 8 and the second driving body 9 is reversed, and the first driving body 9 is turned through the tension spring 10. The first drive body 8 is pulled upward, and the first drive body 8 instantaneously rotates in the direction of arrow D using the fulcrum portions 83a and 83b as rotation fulcrums and returns to the initial position (see FIG. 10). In this case, the first and second contact portions 75a and 75b and the first and second arc contact portions 76a and 76b of the movable contact 7 pass through the insulating piece 223 and are in sliding contact with the sliding contact portion 423. Become. As a result, the circuit having the first switching contact 421 as the normally closed contact and the common contact 41 is switched to a conductive state.

  As described above, in the switch device 1 according to the present embodiment, the first drive body 8 and the second drive body 9 constituting the snap action mechanism 6 are rotated in response to the pressing operation on the operation member 5 to thereby perform the first drive. The fixed contact 4 with which the movable contact 7 contacts is switched by moving the sliding contact position of the movable contact 7 provided on the body 8. In this case, since the fulcrum portion 93 is supported by the concave portion 111 formed on the metal support 11 as the rotation fulcrum of the second drive body 9, along with the rotation operation of the second drive body 9. A situation where the support 11 is deformed can be prevented. For this reason, since the 2nd drive body 9 can be rotated stably, the 1st drive body 8 can be appropriately rotated with rotation of this 2nd drive body 9, Since it is long-term, It is possible to provide a highly reliable switch device 1 that can switch the fixed contact 4 with which the movable contact 7 contacts over with high accuracy.

  In particular, in the switch device 1 according to the present embodiment, the support body 11 is constituted by a metallic plate-like member, and the fulcrum portion 93 of the second drive body 9 is formed by a part of the end surface of the plate-like member. Since it supports, the fulcrum part 93 of the 2nd drive body 9 can be supported more firmly, Therefore The fixed contact 4 which the movable contact 7 contacts for a long period of time can be switched accurately. It becomes possible to provide the switch device 1 with high reliability.

  In the switch device 1 according to the present embodiment, the support body 11 is disposed between the common contact 41 and the switching contact 42, and the switching contact 42 and the support body 11 are provided with a protruding piece 222 as a resin portion. Since they are erected on the same straight line, the urging force of the tension spring 10 applied to the support body 11 via the second drive body 9 is also received by the protruding piece 222 and the switching contact 42, and the support body 11 Can be reinforced by the protruding piece 222 and the switching contact 42, so that it is possible to prevent the position of the support 11 from being displaced by the urging force of the tension spring applied via the second drive body 9.

  Further, in the switch device 1 according to the present embodiment, the first and second contact portions 75a and 75b of the movable contact 7 are brought into sliding contact with the switching contact 42 (the first switching contact 421 and the second switching contact 422). Therefore, the movable contact 7 has a self-cleaning function, and even when used with a minute current, contact failure due to the influence of dust, contact surface sulfidation, oxide film, siloxane gas, etc. is less likely to occur. It is possible to provide a switch device 1 with a long life and high reliability.

  In particular, in the switch device 1 according to the present embodiment, the first and second contact portions 75a and 75b are configured to sandwich the switching contact 42 (the first switching contact 421 and the second switching contact 422). The sliding contact between the first and second contact portions 75a and 75b and the switching contact 42 can be stabilized, and the reliability at the time of switching the fixed contact 4 with which the movable contact 7 contacts can be improved.

  Further, in the switch device 1 according to the present embodiment, the movable contact 7 is formed by bending a metal plate having elasticity, and an open portion 77 is provided so as to be opposed to each other. 71, 72 are arranged at a distance from each other, and one of the first and second bases 71, 72 is connected to the front end portion of the first drive body 8 and the first and second base portions 71, 72 are connected upward. A first projection provided upward from the first and second bases 71 and 72 so as to oppose each other at a position between the coupling parts 73 and 74 and the first and second coupling parts 73 and 74. The second contact portions 75a and 75b are provided. As a result, the switching contact between the first and second contact portions 75a and 75b utilizing the space between the first and second base portions 71 and 72 formed by the first and second connecting portions 73 and 74, respectively. 42 can be appropriately clamped, and the U-shaped first and second connecting portions 73 and 74 that connect the first and second base portions 71 and 72 on the upper side can function as spring spans. Therefore, the sliding contact between the first and second contact portions 75a and 75b and the switching contact 42 can be further stabilized.

  Furthermore, the switch device 1 according to the present embodiment includes a first switching contact 421 and a second switching contact 422 that are spaced apart along the rotational direction of the movable contact 7 with the insulating piece 223 interposed therebetween. The first switching contact 421 constituting the normally closed contact is provided with a regulating piece 423a that abuts the first connecting portion 73 and restricts the movement of the movable contact 7, and the first connecting portion 73 contacts the regulating piece 423a. The contact position is the initial position of the movable contact 7. Thereby, since the movement of the movable contact 7 can be regulated by using a part of the first switching contact 421 and disposed at the initial position, the movable contact 7 can be surely initialized without providing any special components. It becomes possible to arrange in the position. Moreover, although the 1st connection part 73 contact | abuts to the control piece 423a for every operation, since it is metals, it is hard to wear and it becomes possible to maintain the movable contact 7 in an initial position reliably over a long period of time.

  In the above embodiment, the contact portion of the movable contact has a so-called double-sided sliding contact shape that sandwiches the switching contact, but it may have a single-sided sliding contact shape, and depending on the specifications, the switching contact provided up and down as in the past It is good also as a contact part of the shape which contacts / separates. Thus, the present invention is not limited to the above-described embodiment, and can be implemented with various modifications. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the above embodiment, the first switching contact 421 constitutes a normally closed contact, while the second switching contact 422 constitutes a normally open contact, and conducts with the common contact 41 according to the driving of the movable contact 7. Although the case where a single circuit for switching the first switching contact 421 and the second switching contact 422 is provided has been described, the number of circuits switched in the switch device 1 is not limited to this and may be changed as appropriate. Is possible. For example, two or more circuits may be provided and switched in synchronization with the driving of the movable contact 7.

  Moreover, in the said embodiment, although the case where the 1st drive body 8 is formed by giving a punching process and a bending process to a metal plate is demonstrated, the structure of the 1st drive body 8 can be changed suitably. It is. For example, the metal plate may be folded in half so that a part (for example, the base 81) or the whole of the first driver 8 is formed. When the first driving body 8 is formed by folding the metal plate in this way, the strength of the first driving body 8 to which the urging force of the tension spring 10 is applied can be secured, and according to the pressing operation on the operation member 5. It becomes possible to rotate the movable contact 7 to a desired position.

  Furthermore, in the said embodiment, although the case where the support body 11 is made into the structural member independent from the fixed contact 4 (common contact 41, the switching contact 42) is demonstrated, about the structure of the support body 11, it is to this. It is not limited and can be changed as appropriate. For example, the support 11 may be configured integrally with the common contact 41 and embedded in the lower case 22 by insert molding. In this case, since the common contact 41 that supports the first drive body 8 and the support body 11 that supports the second drive body 9 can be configured as one member, these are caused by the biasing force of the tension spring 10. Such a situation can be prevented that the first drive body 8 and the second drive body 9 can be appropriately rotated.

It is a perspective view which shows the external appearance of the switch apparatus which concerns on one embodiment of this invention. It is a disassembled perspective view of the switch apparatus concerning the said embodiment. It is a perspective view of the lower case to which the fixed contact and support in the switch device concerning the above-mentioned embodiment were fixed. It is a sectional side view of the lower case to which the fixed contact and support in the switch device concerning the above-mentioned embodiment were fixed. It is a perspective view of the movable contact and 1st drive body which the switch apparatus which concerns on the said embodiment has. It is the side view (a) and top view (b) of the movable contact which the switch apparatus which concerns on the said embodiment, and a 1st drive body. It is a perspective view of the 2nd drive which the switch device concerning the above-mentioned embodiment has. In the switch device concerning the above-mentioned embodiment, it is a perspective view of the lower case where the snap action mechanism was assembled. In the switch device concerning the above-mentioned embodiment, it is a side view (a) and a top view (b) of a lower case where a snap action mechanism was assembled. It is a sectional side view for demonstrating the internal structure of the switch apparatus which concerns on the said embodiment. It is a side view for demonstrating the operation | movement accompanying the press operation with respect to the operation member in the switch apparatus which concerns on the said embodiment. It is a side view for demonstrating the operation | movement accompanying the press operation with respect to the operation member in the switch apparatus which concerns on the said embodiment. It is a side view for demonstrating the operation | movement accompanying the press operation with respect to the operation member in the switch apparatus which concerns on the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switch apparatus 2 Housing 21 Upper case 211 Opening part 212 Groove part 22 Lower case 221 Projection surface 222 Projection piece (resin part)
223 Insulation piece (insulation part)
3 cover 31 hole 4 fixed contact 41 common contact 411a, 411b contact part 412 terminal part 413a, 413b recess 42 switching contact 421 first switching contact 422 second switching contact 423 sliding contact part 423a regulating piece 424 terminal part 425 sliding contact part 425a Arc contact portion 426 Terminal portion 5 Operation member 51 Press portion 511 Housing portion 52 Shaft portion 521 Groove portion 6 Snap action mechanism 7 Movable contact 71 First base portion 72 Second base portion 73 First connecting portion 74 Second connecting portion 75a First contact portion 75b Second contact portion 76a First arc contact portion 76b Second arc contact portion 77 Opening portion 8 First driver 81 Base portion 81a Hole 82a, 82b Arm portion 83a, 83b Support point portion 9 Second Drive body 91 Pressed portion 92 Opening portion 93 Support point portion 10 Tensile spring 11 Support body 111 Concave

Claims (7)

A housing having a storage portion; an operation member for receiving a pressing operation; a fixed contact formed of a metal common contact and a metal switching contact standing in the storage portion; and a contact portion that is separated from and connected to the switching contact. A movable contact, and a snap action mechanism that drives the movable contact when the operation member is pressed to a predetermined position;
The snap action mechanism has a conductive first driving body in which the movable contact is provided on one end side, and a fulcrum portion that forms a rotation fulcrum is formed in contact with the common contact on the other end side; A pressed portion to be pressed by the operating member is formed on one end side, and the other end side rotates in contact with a part on the common contact side of a metal support erected in the storage portion. A second driving body having a fulcrum portion forming a fulcrum; and a tension spring having both ends attached to a part of the first driving body and a part of the second driving body. Switch device to do.   2. The switch device according to claim 1, wherein the support is configured by a plate-like member, and a fulcrum portion of the second drive body is supported by a part of an end surface of the plate-like member.   The support is disposed between the common contact and the switching contact, and the switching contact and the support are erected on the same straight line with a resin portion interposed therebetween, while the contact portion of the movable contact is switched over. The switch device according to claim 2, wherein the switch device is slidably contacted with the contact.   The switch device according to claim 3, wherein the contact portion of the movable contact has a shape for sandwiching the switching contact.   The movable contact is formed by bending a metal plate having elasticity, and is positioned below the first driving body. The movable contact is provided with first and second bases disposed opposite to each other with an opening. A first and a second connecting portion, which are arranged at an interval, one of which is connected to the tip of the first driving body and connects the first and second bases on the upper side; The first and second contact portions provided so as to protrude upward from the first and second base portions so as to face each other at a position between the second connecting portions. Item 5. The switch device according to item 4.   The switching contact includes a first switching contact and a second switching contact that are spaced apart from each other along the rotation direction of the movable contact with an insulating portion interposed therebetween, and the first switching contact includes a normally closed contact. A position at which a part of the movable contact comes into contact with the part of the movable contact to restrict movement of the movable contact, and a part of the movable contact comes into contact with the restriction piece. The switch device according to claim 5, wherein is an initial position of the movable contact.   In contact with the second switching contact on the side where the contact portion of the movable contact moves in response to a pressing operation on the operating member, the contact between the second switching contact and the contact portion of the movable contact during the pressing operation of the operating member. 7. The switch device according to claim 6, wherein an arc contact portion for generating an arc is provided in advance, and an arc contact portion slidably in contact with the arc contact portion is provided on the movable contact.

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