JP2008066082A - Changeover switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve contact reliability of a contact point by making a movable contact and a fixed contact relatively greatly slide at opening and closing. <P>SOLUTION: A coupling neck part to have a narrow width is installed at a coupling part of a U-shape support frame formed at the tip part of a common terminal plate in order to support a movable member of a switch constituted of a movable contactor and an operation lever or the like with the common terminal plate, and by exposing it on an insulating base in which this coupling neck part supports a fixed terminal plate, and by reducing rigidity of the support frame, at an opening and closing operation, an insulating film formed on a contact surface is removed by greatly sliding the movable contact on the fixed contact. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a changeover switch used by being incorporated in a pushbutton switch or the like.

  This type of switch is already well known from Patent Document 1 and the like.

  FIG. 6 shows a typical configuration of a conventional changeover switch.

  The changeover switch of FIG. 6 includes a normally closed fixed terminal plate 4, a normally open fixed terminal plate 5, and a common terminal plate 6 as fixed members. As shown in FIG. 7, the normally closed fixed terminal plate 4 has a fixed contact 4a attached to the distal end portion and an external connection terminal 4b formed integrally with the proximal end portion. The normally open fixed terminal plate 5 is also provided with a fixed contact 5a at the tip, and is disposed below the fixed contact 4a of the normally closed fixed terminal plate 4 at a predetermined interval. The external connection terminal 5b is integrally formed at the base end. Further, the common terminal plate 6 is formed with a U-shaped support frame 6a for supporting movable members such as the movable contact 2 and the operation lever 3 at the distal end portion, and the external connection terminal 6b is integrally formed at the proximal end portion. Is formed. These fixing members are fixedly supported by an insulating base 1 made of a common insulating resin.

  The movable contact 2 that is a movable member is provided with a double-head movable contact 2a at the distal end, and a fulcrum portion 2c that is in contact with the support frame 6a at the base end and serves as a rotation fulcrum of the movable contact. The FIG. 7 shows the operation lever 3 which is another movable member, but the rotation lever is in contact with the support 1a supporting the operation lever provided on the insulating base 1 at the tip. A fulcrum part 3a is formed, and an operation piece 3b that is operated from the outside is provided at the base end part. The operation lever 3 is supported by a support frame 6a formed on the common terminal board 6, and thereby the upper limit position is limited.

  The movable contact 2 and the operation lever 3 pull hook-like hooks 8a and 8b provided at both ends of the operation spring 8 constituted by a tension coil spring in the locking holes 2h and 3h provided in these. It is connected by hanging.

  6 and FIG. 7, the changeover switch configured as described above is configured so that the operation spring 8 is connected to the distal end portion of the movable contact 2 and the operation lever 3 in a state where the operation piece 3 b of the operation lever 3 is on the upper side. In order to pull the base end upward, the movable contact 2 is rotated toward the normally closed fixed contact 4a, and the movable contact 2a contacts the fixed contact 4a. Thereby, the circuit between the common terminal board 6 and the normally closed fixed terminal board 4 is closed.

When the operation piece 3b is pushed down and the operation lever 3 is rotated counterclockwise with the fulcrum portion 3a as a fulcrum, the hook 8b on the operation lever side of the operation spring 8 moves downward from the center. Is reversed, the movable contact 2 is suddenly pulled downward, the movable contact 2a is closed by the fixed contact 5a of the normally open fixed terminal plate 5, and the common terminal plate 6 is switched to the normally open fixed terminal plate 5. Connecting.
JP 11-195346 A

  In such a changeover switch using the snap action by the operating spring 8, as means for improving the contact reliability of the contact portion, the spring force of the operating spring 8 is increased to increase the contact pressure, It is common to use expensive contact materials with gold plating on the contacts to prevent sulfidation and oxidation. However, increasing the spring force of the operation spring makes it difficult to assemble or use expensive contact materials. Then, the inconvenience that a manufacturing price becomes expensive arises.

  Also, if the contact is structured to slide relatively large when opening and closing, the insulating film formed on the contact surface by sulfidation / oxidation can be peeled off, improving the contact reliability of the contact, According to such a means, the above inconvenience can be solved.

  However, the conventional change-over switch described above uses the insulating terminal to fix the fixed terminal plates 4 and 5 and the common terminal plate in order to increase the rigidity of the support frame 6a formed on the common terminal plate 6 that supports the movable member such as the movable contactor. When the insulating base 1 is formed by insert molding 6, as shown in FIG. 7, the horizontal piece 6 c (see FIG. 7) of the U-shaped support frame 6 is embedded in the base 1. For this reason, even when the support frame 6a receives the spring force of the operation spring 8 during the opening / closing operation, since the amount of bending of the support frame 6a is small, the movable contact 2a of the movable contact 2 is almost on the fixed contacts 4a and 5b. Does not slide.

  For this reason, in the conventional change-over switch, the peeling action of the insulating film formed by sulfidation / oxidation on the surface of each contact due to the sliding of the movable contact and the fixed contact at the time of switching open / close is not performed sufficiently, There is a problem that contact reliability cannot be increased.

  In order to solve such a problem, the present invention provides a change-over switch capable of improving the contact reliability of a contact by causing the movable contact and the fixed contact to slide relatively large during opening and closing. This is a problem.

  In order to solve such a problem, the present invention provides a normally closed fixed terminal plate in which a fixed contact is attached to the distal end portion and an external connection terminal is formed at the proximal end portion, and a U-shaped at the distal end portion. And a common terminal plate with an external connection terminal plate formed at the base end, and these terminal plates are made of insulating resin by exposing the fixed contact and the support frame and the external connection terminal plate. The fixed contact attached to the normally closed fixed terminal plate and the fixed contact attached to the normally open fixed terminal plate are arranged opposite each other on the insulated base by being embedded and fixed on the formed insulating base. A movable contact is attached to the distal end, and a movable contact that forms a fulcrum that becomes a pivot fulcrum by contacting the support frame at the base end, and is pivotally supported by the support frame. Rotating support in contact with the support provided on the insulating base The fulcrum part is formed, and an operation lever provided with an operation piece operated from the outside is connected to the base end part by an operation spring to form a snap action mechanism, and the operation piece of the operation lever is rotated in the vertical direction. Switching is performed so that the movable contact is reversely driven by a moving operation to alternately switch the contact of the movable contact at the tip to the fixed contact of the normally closed fixed terminal plate and the fixed contact of the normally open fixed terminal plate. In the switch, a connection neck portion having a narrow width is provided at a connection portion with a common terminal plate of a U-shaped support frame formed at a distal end portion of the common terminal plate, and the common neck portion is exposed on the insulating base. The terminal board is embedded in the insulation base.

  Further, in the present invention, a ring-shaped engagement portion is provided at both ends of the operation spring, and a locking piece for hooking the engagement portion is provided on the movable contact and the operation lever. It is possible to connect the movable contact and the operation lever by the operation spring by hooking the engaging portion of the operation spring on the locking piece.

  Further, in the present invention, when the normally closed fixed terminal plate, the normally open fixed terminal plate and the common terminal plate are embedded in the insulating base, the alignment position of the insert molding die by the insulating resin is set in the plate thickness direction of each terminal plate. It is better to set the same position.

  According to the present invention, the common terminal plate having the U-shaped support frame formed at the front end portion includes the connection neck portion having a narrow width at the connection portion with the support frame, and the connection neck portion is exposed from the insulating base. Since it is embedded in the insulating base, the support frame is easily bent at the connection neck due to the spring force of the operating spring when opening and closing, and it is greatly displaced, so the movable contact of the movable contactor is greatly displaced along with this. It will slide greatly on each contact point which contacted. For this reason, even if an insulating film is formed on the surface of each contact by sulfidation / oxidation, the insulating film peeling action due to the sliding of the movable contact on the fixed contact is increased, and the contact reliability of the contact can be improved.

  Embodiments of the present invention will be described based on examples shown in the drawings.

  1 and 2 show an embodiment of a changeover switch according to the present invention. FIG. 1 is a perspective view thereof, and FIG. 2 is a longitudinal sectional view thereof.

  In these drawings, the same components as those of the conventional switch are denoted by the same reference numerals.

  The normally closed fixed terminal plate 4 and the normally open fixed terminal plate 5 are each provided with a normally closed fixed contact 4a and a normally open fixed contact 5a at the tip, and integrally formed external connection terminals 4b and 5b at the base end. ing. As shown in FIG. 5 alone, the common terminal plate 6 is formed with a U-shaped support frame 6a for supporting a movable member at the distal end portion, and an external connection terminal 6b integrally formed at the proximal end portion. Has been.

  The tips of the normally closed fixed terminal plate 4 and the normally open fixed terminal plate 5 are bent so that the normally closed fixed contact 4a and the normally open fixed contact 5a are arranged to face each other at a predetermined interval.

  These three fixed terminal plates 4 to 6 are arranged in one row and are embedded and fixed in an insulating base 10 made of insulating resin. Fixed contacts 4a and 5a at the distal end of each fixed terminal, support frame 6a and external connection terminals 4b, 5b and 6b at the proximal end are exposed from the insulating base 10. On the upper surface of the insulating base 10, a support body 10 a for supporting the fulcrum part 3 a at the tip of the operation lever 3 is projected.

  In the conventional apparatus, the common terminal board 6 having the U-shaped support frame 6a is embedded in the insulating base 1 up to the lower side 6c of the U-shaped support frame 6a. In the present invention, either one of FIGS. As is apparent from FIG. 6, the connection neck portion 6 d having a narrow width formed on the connection portion between the common terminal plate 6 and the U-shaped support frame 6 a on the upper surface of the insulating base 10 is exposed from the base 10. , Lower than this.

  As the movable member, there are provided a movable contact 2, an operation lever 3, and an operation spring 8 connecting these. As shown in detail in FIG. 4A, the movable contact 2 is provided with a double-headed movable contact 2a at the tip, and a fulcrum 2c that contacts the support frame 6a at the base and serves as a rotation fulcrum. Is formed, and a locking piece 2d is formed by cutting and raising for hooking the operation spring 8 near the tip of the intermediate portion. Similarly, as shown in FIG. 4B, the operation lever 3 is provided with a fulcrum portion 3a which is a pivotal fulcrum at the distal end portion, which is in contact with the support body 10a formed on the base 10. An operating piece 3b that is operated from the outside is integrally formed, and a locking piece 3d is formed by cutting and raising for hooking the operating spring 8 near the proximal end of the intermediate portion.

  Ring-shaped hooks 8c and 8d are formed at both ends of the operating spring 8 (see FIG. 1). By hooking these hooks on the locking piece 2d of the movable contact 2 and the locking piece 3d of the operating lever 3, respectively. The operation spring 8 is attached to the movable contact 2 and the operation lever 3 to connect them.

  The movable contact 2a at the tip of the movable contact 2 supported rotatably by the support frame 6a is switched to contact with the normally closed fixed contact 4a or the normally open fixed contact 5a as the movable contact 2 rotates. . When the movable contact 2a is in contact with the normally closed fixed contact 4a, the circuit between the common terminal plate 6 and the normally closed fixed terminal plate 4 is closed, and the contact of the movable contact 2a is cut into the normally open fixed contact 5a. In other words, the circuit between the common terminal board 6 and the normally open fixed contact 5 is closed.

  Such a switching operation of the movable contact 2 is performed by rotating the operation piece 3b of the operation lever 3 up and down. When the operation piece 3b of the operation lever 3 is on the upper side as shown in FIG. 2, the operation spring 8 acts to lift the movable contact 2 upward, so that the movable contact 2a is an upper normally closed fixed contact. Contact 4a.

  From this state, when the operating piece 3b of the operating lever 3 is pushed downward, the operating lever 3 pivots counterclockwise around the fulcrum portion 3a supported by the support 10a at the tip, and accordingly, the spring When the hook 8d of 8 is lowered and the locking piece 2d of the movable contact 2 and the locking piece 3d of the operation lever 3 are over the dead center aligned horizontally, the operation spring 8 acting on the movable contact 2 and the operation lever 3 is reached. The direction of the spring force is reversed and the movable contact 2 and the operating lever 3 are pulled downward from each other, so that the movable contact 2 suddenly rotates clockwise, and the movable contact 2 is switched to the normally open fixed contact 5a. To come into contact.

  Thus, when the switch performs a snap action switching operation by operating the operation lever 3, the spring force of the operation spring 8 causes the support frame 6 a of the common terminal plate 6 that supports the movable contact 2 and the operation lever 3. In addition, this acts in the direction of pushing and pulling left and right in FIG. The common terminal plate 6 is embedded in the insulating base 10, but the tip side is embedded only up to a height at which the narrow connection neck 6d that connects the common terminal plate 6 and the support frame 6a is exposed. The portion of the common terminal board 6 that supports the support frame 6a becomes a narrow connection neck 6d, and the rigidity is reduced.

  For this reason, when the spring force of the operation spring 8 is applied to the support frame 6a in accordance with the turning operation of the operation lever 3 and the movable contact 2 by the opening / closing operation, the support frame 6a is greatly bent at the connecting neck portion 6d and displaced to the left and right. become. As the support frame 6a is displaced, the movable contact 2a of the movable contactor 2 slides greatly in contact with the surface of the fixed contact 4a or 5a, so that the movable contact 2a and the fixed contact 4a or 5a The peeling action of the insulating film formed by sulfidation / oxidation on the surface of each contact due to mutual friction increases, and it is possible to prevent the contact resistance between the closed contacts from increasing. Therefore, according to the present invention, it is possible to maintain high contact reliability between the movable contact and the fixed contact without increasing the spring force of the operation spring 8 and using an expensive contact material for the contact. Can do.

  As described above, the operation spring 8 is provided with the ring-shaped hooks 8c and 8d at both ends, and the hooks are fitted to the locking pieces 2d and 3d cut and raised on the movable contact 2 and the operation lever 3. Since the operating spring 8 can be mounted on the movable contact 2 and the operating lever 3 by hooking, the mounting operation of the spring is facilitated.

  Next, a method for manufacturing the changeover switch of the present invention will be described with reference to FIG.

  FIG. 3A shows a step of punching a switch fixing member, and a normally closed fixed terminal plate 4 serving as a fixing member for one switch, which is punched and formed from a common conductive material flat plate by a press machine or the like. The normally open fixed terminal plate 5 and the common terminal plate 6 are shown in a plan view. The three terminal plates 4, 5, and 6 are coupled together by a coupling piece TB that is provided between the terminal plates and called a tie bar, and is cut out after assembly. In this figure, only a fixing member for one switch is shown, but actually, a plurality of fixing members are integrally connected.

  In this figure, 4a 'is a fixed contact mounting portion formed at the tip of the normally closed solid terminal plate 4, 5a' is a fixed contact mounting portion formed at the tip of the normally open fixed terminal plate 5, and 6a is It is a U-shaped support frame that supports a movable member formed at the tip of the common terminal plate 6. A connecting neck portion 6d having a narrow width is formed at a connecting portion between the common terminal plate 6 and the support frame 6a.

  FIG. 3B shows a molding process. In this process, the tip end portion of each flat terminal board is bent by 90 degrees horizontally or vertically as indicated by an arrow at the position of a horizontal or vertical folding line indicated by a dotted line in FIG. Is done.

  In the state in which this molding process is completed, as shown in FIG. 3B, the fixed contact mounting portion 4a ′ of the normally closed solid terminal plate 4 and the fixed contact mounting portion 5a ′ of the normally open fixed terminal plate 5 are These are arranged horizontally and opposed to each other with an interval in the vertical direction. In addition, the support frame 6a provided on the common terminal plate 6 is arranged to face the arrangement direction (horizontal axis direction) of each terminal plate while standing vertically. A normally closed fixed contact 4a and a normally open fixed contact 5a are respectively attached to the fixed contact mounting portions 4a 'and 5a' bent horizontally.

  Next, the process proceeds to a molding process for forming the insulating base 10 shown in FIG. This step is a step of forming the insulating base 10 in which the three terminal boards 4 to 6 are embedded using an insert molding machine. The insulating base 10 is formed by inserting a fixing member molded as shown in FIG. 3B into the molding die and integrally molding the insulating mold with an insulating resin.

  In this molding process, the mold-molding position is set to the same position in the plate thickness direction of each terminal plate of the fixing member as shown by the dotted line in FIG. The narrow connecting neck 6d that connects the common terminal plate 6 and the support frame 6a can be exposed without being embedded in the base 10.

In this way, the fixing member in which the insulating base 10 is integrally formed is cut out in the next connecting piece cutting step by cutting the connecting pieces TB connecting the terminal plates at the positions indicated by dotted lines in FIG. As shown in FIG. 3D, the fixing member in which the coupling piece TB is removed from each terminal board is completed. By mounting a movable member constituted by connecting the movable contact 2 and the operation lever 3 as shown in FIGS. 4A and 4B to the fixed member by the operation spring 8 (see FIG. 1). The changeover switch is completed.
As described above, when the normally closed fixed terminal plate 4, the normally open fixed terminal plate 5 and the common terminal plate 6 are embedded in the insulating base, the alignment position of the insert molding die by the insulating resin is set in the plate thickness direction of each terminal plate. If the same position is used, not only the configuration of the molding die (mold) is simplified, but particularly in the common terminal plate 6, the position where the mold is aligned is more than the connecting neck portion 6d connecting the terminal plate 6 and the support frame 6a. Therefore, the connecting neck 6d is exposed to the outside of the insulating base 10, thereby lowering the rigidity of the support frame 6a, making it easy to bend, and increasing the amount of sliding between the contacts during opening and closing. For this reason, the peeling action of the insulating coating on the contact surface can be improved. Therefore, the effect that the contact reliability of the contact can be enhanced is obtained.

It is a perspective view which shows the structure of the changeover switch by the Example of this invention. It is a longitudinal cross-sectional view which shows the structure of the changeover switch by the Example of this invention. It is a figure which shows the manufacturing process of the changeover switch by the Example of this invention. It is a perspective view which shows the structure of the movable member components used for the changeover switch by the Example of this invention. It is a perspective view which shows independently the common terminal board used for the changeover switch by the Example of this invention. It is a perspective view which shows the structure of the conventional changeover switch. It is a longitudinal cross-sectional view which shows the structure of the conventional changeover switch.

Explanation of symbols

2: movable contact 3: operating lever 4: normally closed fixed terminal plate 4a: normally closed fixed contact 5: normally open fixed terminal plate 5a: normally open fixed contact 6: common terminal plate 6a: support frame 10: insulating base 10a : Support

Claims (3)

  A normally closed fixed terminal plate with a fixed contact attached to the distal end and an external connection terminal formed at the proximal end, and a U-shaped support frame at the distal end and an external connection to the proximal end A common terminal plate on which terminal plates are formed, and these terminal plates are fixed by embedding them in an insulating base formed of an insulating resin by exposing the fixed contacts, the support frame, and the external connection terminal plates. On the base, the fixed contact attached to the normally closed fixed terminal plate and the fixed contact attached to the normally open fixed terminal plate are arranged to face each other with an interval in the vertical direction, and a movable contact is attached to the distal end portion. And a movable contact that forms a fulcrum portion that becomes a pivot fulcrum by abutting against the support frame, and a support that is pivotally supported by the support frame and that has a tip portion abutting on a support provided on the insulating base. To form a fulcrum part that serves as a pivotal fulcrum. The operation lever provided with the operation piece is connected by an operation spring to form a snap action mechanism, and the tip of the movable contact is driven in reverse by rotating the operation piece of the operation lever up and down. In a changeover switch configured to alternately switch the contact of the movable contact of the fixed contact of the normally closed fixed terminal plate to the fixed contact of the normally open fixed terminal plate, a U-shape formed at the tip of the common terminal plate A changeover switch characterized in that a connecting neck portion having a narrow width is provided at a connecting portion of the support frame with the common terminal plate, and the common terminal plate is embedded in the insulating base so that the neck is exposed on the insulating base. .   The thing of Claim 1 WHEREIN: While providing the ring-shaped engagement part in the both ends of the said operation spring, the latching piece which hooks this engagement part on the said movable contact and an operation lever is provided, A movable contact and A change-over switch characterized in that an engaging portion of an operating spring is hooked on a locking piece of the operating lever so that the movable contact and the operating lever are linked by the operating spring.   3. The terminal plate according to claim 1, wherein when the normally closed fixed terminal plate, the normally open fixed terminal plate, and the common terminal plate are embedded in an insulating base, the alignment position of the insert molding die with an insulating resin is set to each terminal plate. A changeover switch characterized by having the same position in the plate thickness direction.

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