JP5269277B2 - Push-on switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push-on switch capable of preventing inferior conduction between a ridge of a central part contact and the circumferential edge of a hole part of a movable contact. SOLUTION: An acute angle between a virtual perpendicular L passing through a convergent point C of the ridge 3d of the central part contact 3 and perpendicularly extending to the bottom of a recess part of an insulating case body 1 and the ridge 3d is set to 83 deg.-89 deg..

Description

BACKGROUND OF THE INVENTION
The present invention relates to a push-on switch and a manufacturing method thereof.

[Prior art]
As a push-on switch, an insulative case body having a recess, a flat center contact and an end contact fixed in the case body, a hole in the center, and an edge contacting the end contact A movable contact that can be reversed so that the central portion protrudes toward the opening in the recess, and an operation member that contacts the peripheral edge of the hole of the movable contact with the central contact. Some have. However, in such a push-on type switch, there is a problem that a contact failure occurs between the central contact and the movable contact when dust, dust or the like adheres to the flat central contact. Therefore, it protrudes toward the hole portion of the movable contact, to form the central portion contact the polygonal shape having at least two ridges of the outer surface converge toward the tip portion has been proposed. In this case, the acute angle between the virtual perpendicular extending through the convergence point of the two ridge lines and perpendicular to the bottom surface of the recess and the ridge line was about 82 °. In this push-on switch, since at least two ridge lines come into contact with the peripheral edge of the hole of the movable contact, even if dust or the like is interposed between one ridge line and the movable contact, it is movable with other ridge lines. Electrical contact can be maintained with the contacts. In addition, there is an advantage that even if dust or the like is attached to the ridgeline, it can be dropped naturally.

[Problems to be solved by the invention]
However, even in such a push-on type switch, there is a case where a conduction failure occurs between the ridgeline of the central contact and the peripheral edge of the hole of the movable contact.

An object of the present invention is to provide a push-on switch that can prevent a conductive failure between a ridge line of a central contact and a peripheral edge of a hole of a movable contact, and a method of manufacturing the same.

Another object of the present invention is to provide a push-on switch that can prevent a portion of an operating member that contacts a movable contact from being scraped, and a method of manufacturing the same.

Another object of the present invention is to provide a push-on switch and a manufacturing method thereof can be enhanced solderability of the terminal portions projecting from the case body is connected to the central portion contact and edge contact .

[Means for Solving the Problems]
A push-on switch to be improved by the present invention includes an insulating case body having a recess, a center contact and an end contact fixed in the recess of the case body, and a hole in the center portion. A movable contact that is housed in the recess so that the edge contacts the end contact and is curved so that the central portion protrudes toward the opening in the recess, and a hole in the movable contact when operated. And an operating member that moves in the recess so as to bring the peripheral edge of the portion into contact with the center contact. The central contact protrudes toward the hole of the movable contact, and the outer surface thereof has a polyhedral shape having at least two ridge lines that converge toward the tip. In the present invention, the acute angle between each of the imaginary perpendicular line extending perpendicularly to the bottom surface of the concave portion through the convergence point of at least two ridge lines and the ridge line is set to 83 ° to 89 °. More preferably, it is set to 85 ° to 87 °. As a result of various studies, the present inventor has found that when the angle range is set in this way, a conduction failure between the ridgeline of the central contact and the peripheral edge of the hole of the movable contact can be effectively prevented. This is because, when the angle is set to 83 ° to 89 °, the contact area between the ridgeline of the central contact and the peripheral edge of the hole of the movable contact can be increased as compared with the prior art, and variations in ridgeline formation can be reduced. it is conceivable that.

In another invention of the present application, at least a portion of the operation member that contacts the movable contact is formed of a resin material having a coefficient of dynamic friction with respect to copper of 0.3 or less. Normally, the portion of the operating member that contacts the movable contact is often designed so as not to contact the peripheral edge of the hole of the movable contact, but when operating the push-on switch, the operating member is shaken, The operation member may contact the peripheral edge of the hole of the movable contact. In such a case, if the operation member is formed of a resin material having a coefficient of dynamic friction with respect to copper that has been conventionally used of 0.5 or more, the operation member may come into contact with the peripheral edge or center contact of the hole and scrape off. . Therefore, if the portion of the operating member that contacts at least the movable contact is formed of a resin material having a coefficient of dynamic friction with respect to copper of 0.3 or less, the operating member can be prevented from being scraped. As such a resin material, polyamide, polycarbonate, polyvinyl chloride or polypropylene can be used. More preferably, a polyamide having a dynamic friction coefficient with respect to copper of 0.2 or less is used.

In such a case, the operating member is integrally formed, and an opening that surrounds the periphery of the hole is provided in the center of the portion of the operating member that comes into contact with the movable contact in a state of being larger than the hole and in contact with the movable contact. It is preferable to form a recess extending in a direction away from the movable contact. In this way, the operating member can be easily manufactured using a single material, and the portion of the operating member that contacts the movable contact contacts the peripheral edge of the hole of the movable contact due to the simple structure of the recess. Can be effectively prevented.

Further, even if the portion of the operating member that contacts at least the movable contact is made of metal, the operating member can be prevented from being scraped.

To reduce the number of components, the central portion contact and the end contact is preferably configured two types of connection terminal fittings integrally formed with the terminal portion projecting from the respective insulating case body. In this case, the insulating case body is formed by insert molding using two types of connection terminal fittings as inserts, and the surfaces of the two types of connection terminal fittings are entirely made of plated metal except for the tip of the terminal portion. It is preferable to cover. In this way, since the surfaces of the two types of connection terminal fittings are entirely covered with the plated metal except for the tip of the terminal portion, the solderability of the terminal portion can be improved.

The connection terminal fitting can be made of, for example, brass, iron, or phosphor bronze, and the plating metal can be silver plating. Use of silver plating has the advantage of improving solderability and preventing corrosion.

Although the movable contact can be formed using various conductive materials, it is preferable to form the movable contact using stainless steel in order to improve the reversal operation.

In order to manufacture the push-on type switch according to the present invention, first, a metal plate is subjected to press working, and a first connection terminal fitting integrally provided with a center contact and a terminal portion, two end contacts and a terminal portion. A hoop-shaped metal frame including a plurality of portions constituting the second connection terminal fitting integrally provided with the above is prepared. Next, the insulating case main body having the concave portion is formed such that the portion including the central contact and the two end contacts of the hoop-shaped metal frame is an insert, and the central contact and the two end contacts are exposed on the bottom surface of the concave portion. Then, it is formed by insert molding using a synthetic resin material. Next, a reversible movable contact that is provided with a hole in the central portion and curved so that the central portion protrudes toward the opening in the concave portion is placed in the concave portion so that the edge contacts the end contact. Store. Then, when operated, the switch assembly is manufactured by disposing an operation member on the movable contact so as to bring the peripheral edge of the hole of the movable contact into contact with the central contact on the movable contact. Thereafter, the hoop-shaped metal frame is cut at an appropriate location to complete a push-on switch having the first and second connection terminal fittings. In the manufacturing method of the present invention, the hoop-like metal frame is entirely plated on the metal plating. Conventionally, after metal plating for soldering is applied to a metal material plate, the metal material plate is pressed to make a hoop-like metal frame, so that the metal surface is not applied to the press cut surface, and the circuit of the connection terminal fitting There has been a problem that the effect of metal plating cannot be sufficiently obtained due to a decrease in solderability to a substrate or the like. In the present invention, a metal material plate is pressed to form a hoop-like metal frame, and then metal plating is performed, so that the hoop-like metal frame is entirely plated on the metal plating. Therefore, it is possible to prevent the effect of the metal plating from being lowered by applying metal plating to the press cut surface.

DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a push-on switch according to an embodiment of the present invention, and FIG. 2 is a plan view of an insulating case body of the push-on switch shown in FIG. It is. As shown in each drawing, the push-on switch of this example has an insulating case body 1, a center contact 3, a pair of end contacts 5, 7, a movable contact 9, and an operation member 11. The insulative case body 1 has a quadrangular outer shape, and a cylindrical recess 1a that opens upward is formed inside. The inner surface of the concave portion 1a includes flat surface portions 1b to 1e having flat surfaces protruding in four directions at intervals of 90 degrees, and curved surface portions 1f to 1i connecting the flat surface portions 1b to 1e. . These curved surface portions 1f to 1i form part of a cylindrical curved surface having the same radius.

The center contact 3 and the pair of end contacts 5 and 7 are embedded and fixed on the bottom surface of the recess 1a of the insulating case body 1 so as to be exposed on the bottom surface. As shown in FIG. 2, the central contact 3 is connected to the terminal portions 13 </ b> A and 13 </ b> B of the switch protruding from the insulating case body 1, and the terminal contacts 5 and 7 are switches protruding from the insulating case body 1. Terminal portions 13C and 13D. In this example, the center contact 3 is formed integrally with the terminal portions 13A and 13B to form a first connection terminal fitting, and the end contacts 5 and 7 are integrated with the terminal portions 13C and 13D. The second connection terminal fitting is formed by molding. Both the first connection terminal fitting and the second connection terminal fitting are formed by pressing a metal material plate made of brass, iron or phosphor bronze. The surfaces of the first connection terminal fitting and the second connection terminal fitting are entirely covered with silver plating except for the tip portions 13a of the terminal portions 13A to 13D. This silver plating is performed after the metal material plate is pressed. The insulating case body 1 is formed by insert molding using the first and second connection terminal fittings as inserts.

The portions of the pair of end contacts 5 and 7 that protrude toward the bottom surface of the concave portion 1a are base portions 5a and 7a that have a rectangular outer diameter, and so-called kamaboko-shaped contact portions 5b and 7b that protrude from the center of the base portion. It consists of and. As shown in FIG. 2, the base portions 5a and 7a have a length dimension substantially equal to the length dimension of the flat surface portions 1c and 1e of the insulating case body 1, and the end portion on the flat surface portion side is The width is such that it is embedded in the insulating case body 1.

The center contact 3 is disposed substantially at the center of the recess 1a, and includes a first portion 3a embedded in the bottom of the recess 1a and a second portion 3b exposed from the bottom surface of the recess 1a. The first portion 3a is connected to the terminal portions 13A and 13B via a neck portion 13E that is appropriately bent so that the second portion 3b is reliably exposed from the bottom surface of the recess 1a.

The second portion 3b of the center contact 3 has a polygonal shape such as a circle or a quadrangle on the bottom side, and the center protrudes toward a hole 9a of the movable contact 9 described later. As shown in FIG. 3, the outer surface shape of the second portion 3b has a regular polyhedral shape in which three unit surfaces 3c... Having the same shape having a fan shape are combined. As a result, the unit surfaces 3c on the outer surface of the second portion 3b have three ridge lines 3d that converge toward the tip portion at the mutual coupling portion. As shown in FIG. 4, an imaginary perpendicular L extending perpendicularly to the bottom surface of the recess 1a through the intersection of these three ridge lines 3d, that is, the convergence point C, is the center point of the hole 9a of the movable contact 9. It is located to pass. Further, the acute angle θ between each of the virtual perpendicular L and the ridgeline 3d... Is set to 86 °. This angle θ can be appropriately set within a range of 83 ° to 89 °. Further, it is preferably set to 85 ° to 87 °. When the angle is set in this way, it is possible to effectively prevent a conduction failure between the ridgeline of the central contact and the peripheral edge of the hole of the movable contact.

The movable contact 9 has a shape formed of elastic stainless steel and capable of reversing operation, and has a disk shape that is curved so that the central portion protrudes toward the opening side of the recess 1a. The circular end edge of the movable contact 9 is in contact with the four curved surface portions 1f to 1i constituting the inner peripheral surface of the recess 1a shown in FIG. 2, and is always in contact with the contact portions 5b and 7b of the end contacts 5 and 7. It is accommodated in the recess 1a so as to come into contact. A hole 9 a having a substantially circular peripheral edge is formed at the center of the movable contact 9.

As shown in FIG. 1, the operation member 11 includes a tubular pressing portion 11a, an annular flange portion 11b, and an operation portion 11c that is touched by an operator's finger, and is integrally formed of nylon resin. . The operation member 11 is arranged on the upper part of the movable contact 9 and reverses the movable contact 9 when operated so as to move toward the bottom surface side of the recess 1a. The hollow portion 11d of the tubular pressing portion 11a is configured by a concave portion extending in a direction away from the movable contact 9, and has a shape larger than that of the hole 9a of the movable contact 9 in the central portion on the lower surface side. An opening that surrounds the periphery of the hole 9a of the movable contact 9 is provided in contact. The flange portion 11b is opposed to the pressing portion 11a via an annular groove portion, and has an outer diameter dimension capable of smoothly sliding in a space surrounded by the curved surface portions 1f to 1i on the inner peripheral surface of the concave portion 1a. Yes. The operation member may be formed of a resin material having a coefficient of dynamic friction with respect to copper of 0.3 or less at least at a portion in contact with the movable contact. For example, the operation member can be formed using polyamide, polycarbonate, polyvinyl chloride, or polypropylene. .

A fixing plate 15 is provided at the opening of the insulating case body 1 so as to close the end surface on the opening side. A circular through hole 15 a into which the operation portion 11 c of the operation member 11 is loosely fitted is formed in the center portion of the fixing plate 15. As shown in FIG. 2, the fixing plate 15 is formed by inserting fixing protrusions 17 provided at the four corners of the upper surface of the insulating case body 1 into mounting holes (not shown) provided at corresponding positions of the fixing plate 15. It is fixed by welding 17. Further, the protrusion 17 may be mechanically deformed and fixed by pressing.

In the push-on type switch of this example, when the operating portion 11c of the operating member 11 is pressed toward the movable contact 9, the pressing portion 11a moves in the recess 1a and presses so that the movable contact 9 is reversed. As a result, the peripheral edge of the hole 9a of the movable contact 9 and the ridgeline 3d of the central contact 3 come into contact with each other, and conduction between the switch terminal portions 13A and 13B and the terminal portions 13C and 13D is achieved. When the finger is released from the operation portion 11c of the operation member 11, the pressing portion 11a moves in the concave portion 1a in the opposite direction to that described above, so that the movable contact 9 returns to the normal shape. As a result, the peripheral edge of the hole 9a of the movable contact 9 is separated from the ridge line 3d of the central contact 3, and the conduction between the switch terminal portions 13A and 13B and the terminal portions 13C and 13D is released.

The push-on switch of this example was manufactured as follows. First, the metal plate is pressed and the first connection terminal fitting integrally provided with the central contact 3 and the terminal portions 13A, 13B, the two end contacts 5, 7 and the terminal portions 13C, 13D are integrated. A hoop-shaped metal frame including a plurality of sets constituting the second connection terminal fitting provided in the above was prepared. Next, after silver-plating the hoop-like metal frame as a whole, the portion including the center contact 3 and the two end contacts 5 and 7 of the hoop-like metal frame is used as an insert, and the center contact on the bottom surface of the recess 1a. The insulating case body 1 was formed by insert molding using a synthetic resin material so that the three and two end contacts 5 and 7 were exposed. Next, the movable contact 9 that can be reversed and has a hole 9a in the central portion and is curved so that the central portion protrudes toward the opening in the concave portion 1a, the edge contacts the end contacts 5 and 7 It accommodated in the recessed part 1a. Next, after the operation member 11 was disposed on the movable contact 9, the fixing plate 15 was disposed. Then, the fixing plate 15 was fixed by the fixing protrusions 17 to manufacture the switch assembly. Next, the hoop-shaped metal frame was cut at an appropriate location to complete a push-on type switch having first and second connection terminal fittings. In the manufacturing method of this example, the metal plate is pressed after the metal material plate is pressed to form the hoop-like metal frame, so that the metal surface is also applied to the press cut surface to prevent the metal plating effect from being lowered. be able to.

【Effect of the invention】
According to the present invention, the acute angle between each of the virtual perpendicular and the ridge extending perpendicularly to the bottom surface of the recess through the convergence point of at least two ridges is set to 83 ° to 89 °. Conductive failure between the ridgeline of the partial contact and the peripheral edge of the hole of the movable contact can be effectively prevented.
[Brief description of the drawings]
[Figure 1]
It is a schematic sectional drawing of the push-on type switch of embodiment of this invention.
[Figure 2]
It is the top view which looked at the insulating case main body of the push-on type switch shown in FIG. 1 from the opening part side of the recessed part.
[Fig. 3]
It is a top view of the 2nd part of the center part contact of the push-on type switch shown in FIG.
[Fig. 4]
FIG. 2 is an enlarged view of a contact portion between a central contact and a movable contact of the push-on switch shown in FIG. 1.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulating case main body 1a Concave part 3 Center part contact 3d Edge line 5,7 End part contact 9 Movable contact 9a Hole part 11 Operation member 13A-13D Terminal part L Virtual perpendicular

Claims (6)

An insulating case body having a recess;
A center contact and an end contact fixed in the recess of the case body;
A hole portion is provided in the central portion, and an end edge is accommodated in the concave portion so as to come into contact with the end portion contact, and can be reversed so that the central portion protrudes toward the opening side in the concave portion. A movable contact;
An operation member that moves within the recess so as to contact the peripheral edge of the hole of the movable contact and the central contact when operated.
In the push-on switch in which the center contact protrudes toward the hole of the movable contact and the outer surface has a multi-face shape having at least two ridges that converge toward the tip,
The portion of the operating member that contacts at least the movable contact is formed of a resin material having a coefficient of dynamic friction with respect to copper of 0.3 or less ,
A push-on characterized in that an acute angle between each of the imaginary perpendicular line extending perpendicularly to the bottom surface of the recess through the convergence point of the at least two ridge lines and the ridge line is 85 ° to 87 ° Type switch.
The push-on switch according to claim 1, wherein polyamide, polycarbonate, polyvinyl chloride, or polypropylene is used as the resin material.
The operation member is integrally formed, and a center of a portion of the operation member that contacts the movable contact is larger than the hole and surrounds the periphery of the hole in a state of being in contact with the movable contact. The push-on type switch according to claim 2, wherein a recess having an opening and extending in a direction away from the movable contact is formed .
Before Symbol central contact and said end contact constitutes respectively the two types of connection terminal fittings are integrally formed with the terminal portion projecting from the insulating case body,
The insulating case body is formed by insert molding using the two types of connection terminal fittings as inserts,
2. The push-on switch according to claim 1, wherein the surfaces of the two types of connection terminal fittings are entirely covered with a plated metal except for the tip end portion of the terminal portion.
5. The push-on switch according to claim 4 , wherein the two types of connection terminal fittings are made of brass, iron or phosphor bronze, and the plating metal is silver plating.
6. The push-on switch according to claim 5 , wherein the movable contact is made of stainless steel.

Images