JP3182390U - Slide switch - Google Patents

Abstract

A highly durable slide switch capable of maintaining a contact surface in a good state even when arc discharge occurs when switching a relatively large capacity current is provided at a relatively low cost.
SOLUTION: An elastic means 18 is provided for elastically pressing a front end portion and a rear end portion in a moving direction of a movable contact piece 17 toward a fixed contact 121, 131, 141 side, and each fixed contact 121, 131, 141 is provided. The contact surface with the movable contact piece 17 is located at a height from the substrate 11 common to other fixed contacts and is located on a plane parallel to the upper surface of the substrate 11, and descends from the first contact portion. And a second contact portion located on the inclined surface.
[Selection] Figure 2

Description

  The present invention relates to a slide switch that can be used for opening / closing and switching circuits of various office automation equipment, communication equipment, electrical measuring instruments, and the like.

  In the slide switch, a conductive movable contact piece that moves integrally with the knob moves on a plurality of fixed contacts arranged on the substrate and contacts or separates with any of the fixed contacts as the knob moves horizontally. As a result, the current is switched between on and off between the fixed contact and the fixed contact connected to the common terminal.

  This phenomenon is not a problem when switching a very small current of several milliamperes, but when switching a medium current of about 3A to 10A, a relatively large arc is generated between the movable contact piece and the fixed contact, which melts the contact. Wear. This arc phenomenon is a phenomenon common to a switch used for a current of medium capacity or more, such as a slide switch, a toggle switch, and a push switch, and affects the operating life of the switch. For this reason, conventionally, the use of pure silver, nickel silver, silver alloy, etc. as the contact material reduces the electrical resistance between the contacts or increases the hardness of the contact surface. Ingenuity to suppress melting has been performed. However, since such contact materials are expensive, there is a limit to the suppression of manufacturing costs.

  Further, Patent Document 1 discloses that the contact can be easily made even if an arc is generated by making the metal piece for the movable contact / fixed contact thick enough to withstand medium current. There has been proposed a push slide switch that does not wear out. However, increasing the plate thickness of the metal piece is also a limit to reducing the manufacturing cost.

Japanese Utility Model 583972

    The problem to be solved by the present invention is that even when arc discharge occurs when switching a relatively large medium current, it is not necessary to use expensive contact materials, and it is not necessary to increase the plate thickness. An object of the present invention is to provide a slide switch capable of holding a contact surface in a good state.

A slide switch according to the present invention has a plurality of fixed contacts arranged in a line on a substrate, and a movable contact piece movable along the arrangement of the fixed contacts. In the two fixed contacts selected from the fixed contacts, the selected two fixed contacts are electrically contacted with or separated from the other fixed contact while always in contact with one fixed contact. In slide switch to connect or disconnect,
The slide switch includes elastic means for elastically pressing the front end portion and the rear end portion in the moving direction of the movable contact piece toward the fixed contact side,
Each of the fixed contacts has a first contact portion whose contact surface with the movable contact piece is located on a plane parallel to the upper surface of the substrate at a height from the substrate common to the other fixed contacts, A slide switch comprising: a second contact portion that is continuous with the first contact portion and located on an inclined surface that descends from the first contact portion.

The slide switch includes an operation knob for holding the movable contact piece on a lower surface side,
The elastic means is provided between the operation knob and the movable contact piece. When one of the front end portion and the rear end portion of the movable contact piece is pushed down toward the fixed contact side, the movable contact piece 2. The slide switch according to claim 1, wherein the movable contact piece acts on the movable contact piece so that the other of the front end portion and the rear end portion is moved away from the fixed contact side.

  The elastic means is constituted by a leaf spring, and the leaf spring is bent so that a central portion in the longitudinal direction protrudes upward and is engaged with the lower surface of the operation knob, and both longitudinal ends are the movable contact pieces. It is good to provide so that it may latch with the said front-end part and rear-end part.

  The elastic means is composed of a long plate member and a pair of elastic members, and the plate member is bent so that the central portion in the longitudinal direction protrudes upward and is locked to the lower surface of the operation knob. , Both end portions in the longitudinal direction are provided so as to be engaged with the front end portion and the rear end portion of the movable contact piece, and the pair of elastic members are respectively connected to the front end portion or the rear end portion in the moving direction of the operation knob. You may arrange | position between the lower surface of this and the upper surface of the front-end part or rear-end part of the said plate member corresponding to it.

  The inclined surface on which the second contact portion of the fixed contact is located may be formed in a curved surface shape.

  The inclined surface on which the second contact portion of the fixed contact is located may be formed as a flat surface.

  In the slide switch according to the present invention, the movable contact piece movable along the arrangement of the fixed contacts is always in contact with one of the two fixed contacts selected from the plurality of fixed contacts, while the other fixed When selectively contacting or separating from the contact, the movable contact piece before contacting the other fixed contact does not support the lower surface of the front end, so the front end in the moving direction is pushed down by the elastic means and is movable. The contact piece tilts with one fixed contact supporting the lower surface of the intermediate portion as a fulcrum, and when the movable contact piece advances toward the other fixed contact in that state, the first contact between the movable contact piece and the other fixed contact is established. The contact is made with the second contact portion located at a position lower than the first contact portion of the other fixed contact, and then the movable contact piece comes into contact with the first contact portion of the other fixed contact. Advance until bottom surface is supported . In addition, the movable contact piece before separation from the other fixed contact begins to move, and the contact surface of the other fixed contact supporting the lower surface of the rear end portion moves from the first contact portion to the second contact portion. Since the height is lowered, the rear end portion in the moving direction is pushed down by the elastic means, and the movable contact piece tilts with one fixed contact supporting the lower surface of the intermediate portion as a fulcrum. The fixed contact is separated from the rear end portion of the movable contact piece and the second contact portion of the other fixed contact.

  Due to this action of the present invention, the arc discharge is caused by the movable contact piece with the second contact portion on the inclined surface at a position lower than the first contact portion of the fixed contact contacting the lower surface of the intermediate portion of the movable contact piece. Occurs at the start or separation of contact with the front or rear end. Therefore, the first contact portion of the fixed contact is not worn or melted by arc discharge. Thus, the operating life of the slide switch is greatly improved.

  Further, in the slide switch according to the present invention, since the metal excellent in arc discharge corrosion resistance, that is, expensive silver or silver alloy, is only used as a plating material, the manufacturing cost of the slide switch can be kept low.

FIG. 1 is a front view showing an embodiment of a slide switch according to the present invention. FIG. 2 is a partial longitudinal sectional view partially cut along the longitudinal direction of the slide switch shown in FIG. FIG. 3 is a plan view of the slide switch shown in FIG. FIG. 4 is a bottom view of the slide switch shown in FIG. It is a top view which shows the board | substrate used for the slide switch shown in FIG. 6 (1) is a perspective view showing a terminal used in the slide switch shown in FIGS. 1 to 4 in a state before assembly, (2) is a right side view of (1), and (3) FIG. 2 is a plan view of (2). FIG. 7 is a plan view showing a frame used in the slide switch shown in FIGS. 1 to 4 in a state before the terminals are assembled. 8 is a front view (left half) of FIG. 7 and a cross-sectional view taken along line 8-8 in FIG. 7 (right half). FIG. 9 is a view showing an assembly of the operation knob, the movable contact piece, and the leaf spring extracted from FIG. FIG. 10 (1) is a view showing the movable contact piece extracted from the movable assembly of FIG. 9, and (2) is a side view of the movable contact piece. FIG. 11 (1) is a view showing a leaf spring member extracted from the movable assembly of FIG. 9, and (2) is a plan view of the leaf spring member. FIG. 12 is a view similar to FIG. 9 showing a modification of the elastic means. FIGS. 13 (1), (2) and (3) are schematic diagrams for explaining the switch operation of the slide switch according to the present invention. FIGS. 14A and 14B are plan views showing the positional relationship between the fixed contact and the movable assembly in the slide switch according to the second embodiment of the present invention.

  Next, an embodiment of a slide switch according to the present invention will be described with reference to the accompanying drawings.

  1 to 4, a slide switch according to the present invention is shown as a front view, a partial longitudinal sectional view, a plan view, and a bottom view, respectively, in which the slide switch is generally indicated by reference numeral 10. It is.

  As shown in the figure, in the present embodiment, the slide switch 10 includes a substrate 11, three terminals 12, 13, and 14 fixedly held on the substrate 11, a frame 15 that fixes and holds the substrate 11, terminals 12, and And a movable assembly 16 configured to be movable so as to perform switching operation between electrical conduction between the terminals 13 and 14 and electrical conduction between the terminals 13 and 14.

  FIG. 5 is an enlarged plan view of only the substrate 11 extracted from the slide switch 10 of FIGS. 1 to 4. As shown in the figure, the substrate 11 has a rectangular shape and can be formed as a laminate of an appropriate synthetic resin material such as a phenol resin. In this embodiment, twelve slot-shaped openings 111 are formed in the substrate 11, and these openings 111 are arranged in three rows at equal intervals along the longitudinal direction of the substrate 11. As will be described later, in the present embodiment, six openings 111 (ie, three pairs of openings 111) included in the central two rows of the four rows of openings 111 have three terminals 12, 13, and 14. Used to fix and hold on the substrate 11.

  Further, as shown in FIG. 5, the substrate 11 is formed with a pair of notches 112 on both side edges along the longitudinal direction, and these notches 112 are formed in a frame 15 as will be described later. Is fixedly held on the substrate 11.

  In the present embodiment, the three terminals 12, 13 and 14 have the same configuration with the same size and shape. 6 (1), (2), and (3) are left side views of the terminal 12 (13, 14) in a state before assembly (that is, a state before being fixedly held on the substrate 11), respectively. A front view and a plan view are shown.

  As shown in FIG. 6 (1), the terminals 12, 13, and 14 are parallel to the moving direction of the head parts 121, 131, and 141 that are fixed contacts and the movable assembly 16d of the head parts 121, 131, and 141. Formed in the shape of a substantially inverted U shape comprising long legs 122, 132, 142 hanging from one of opposing side edges extending and short legs 123, 133, 143 hanging from the other of the opposite side edges Has been.

  As is clear from FIGS. 6 (1), (2), and (3), in this embodiment, the long legs 122 are provided on the heads 121, 131, and 141 that are fixed contacts of the terminals 12, 13, and 14, respectively. , 132, 142 and short legs 123, 133, 143 are not formed, and a pair of inclined surfaces 121b, 131b, 141b are formed so that ridgelines 121a, 131a, 141a are formed along a center line between both side edges. The ridgelines 121a, 131a, 141a are formed and extend in a direction perpendicular to the moving direction of the movable assembly 16. That is, the pair of inclined surfaces 121b, 131b, and 141b are between the ridgelines 121a, 131a, and 141a and the side edges where the long leg portions 122, 132, and 142 and the short leg portions 123, 133, and 143 are not formed. Formed. As shown in FIG. 6 (2), round holes 124, 134, 144 are formed on the lower ends of the long legs 122, 132, 142 of the terminals 12, 13, 14, and the round holes (124, 134 and 144 are used when the lead wires are entangled and soldered after the terminals 12, 13, and 14 are assembled.

  The ridgelines 121a, 131a, 141a of the head portions 121, 131, 141, which are fixed contacts, are positioned on a plane parallel to the upper surface of the substrate 11 at the same height from the substrate 11 common to the fixed contacts 121, 131, 141. doing. The inclined surfaces 121b, 131b, and 141b are inclined surfaces that descend from the ridge lines 121a, 131a, and 141a.

  In the present invention, the head portion 131, which is a common fixed contact located at the center, is always in contact with the lower surface of the center portion in the longitudinal direction of the movable contact piece 17 described later included in the movable assembly 16, and the end portion of the movable contact piece 17. Therefore, the inclined surface 121b is not always necessary. However, the head portions 121 and 141 which are fixed contacts located on both sides of the head portion 131 are inclined at least on the side facing the central head portion 131 as a place where contact or separation with the end of the movable contact piece 17 is performed. The surface 121b and the inclined surface 141b need to be formed. The inclined surfaces 121b, 131b, and 141b of the head portions 121, 131, and 141 are formed as flat surfaces in the illustrated example, but may be formed as curved surfaces.

  According to this embodiment, the terminals 12, 13, and 14 themselves are formed from a relatively inexpensive good conductor metal, such as copper, and there is a metal material such as silver or a silver alloy (for example, silver nickel) having excellent arc discharge corrosion resistance. Alloy, silver-tungsten alloy, etc.). Therefore, the cost of the terminals 12, 13, and 14 themselves can be reduced as compared with the case where the entire terminals 12, 13, and 14 are formed of silver or a silver alloy.

  The long legs 122, 132, and 142 and the short legs 123, 133, and 143 of the terminals 12, 13, and 14 have the same width and thickness, and the width and thickness are the slot-shaped openings 111 of the substrate 11. Corresponds to the length and width. When the terminals 12, 13, and 14 are assembled to the substrate 11 and fixedly held there, first, the long legs 122, 132, and 142 and the short legs 123, 133, and 143 of the terminals 12, 13, and 14 are first assembled to the substrate. 11 are inserted through a pair of openings 111 in two central rows from a predetermined direction, and then the short leg portions 123, 133, 143 are bent on the surface side of the substrate 11, whereby each terminal 12 to the substrate 11 is bent. , 13, and 14 are completed (see FIGS. 1, 2 and 4).

  As shown in FIGS. 7 and 8, the frame 15 has a rectangular top plate 151, and a pair of attachment pieces 152 integrally projecting horizontally from both longitudinal ends of the top plate 151, It comprises a pair of side plates 153 that are integrally suspended from both side edges of the top plate 151. In the present embodiment, the frame 15 itself is formed from an appropriate low-cost metal material such as a steel plate through punching, bending, or the like.

  A rectangular opening 151 a is formed at the center of the top plate 151 of the frame 15, and the four corner portions of the top plate 151 that are left are engraved on the surface to form a recess portion 151 b. Corresponding protrusions 151c are formed on the back side (see FIG. 8).

  On the other hand, a mounting hole 152a is formed in each of the pair of mounting pieces 152 of the frame 15 (see FIG. 7), and a mounting screw (not shown) is inserted when the slide switch 10 is mounted to an external device. .

  A pair of gripping claws 153a are integrally formed projecting downward from the lower side of each of the pair of side plates 153 of the frame 15. The distance between the pair of gripping claws 153a coincides with the distance between the pair of notch portions 112 formed on both side edges extending along the longitudinal axis of the substrate 11, and the lateral width of each gripping claws 153a is the notch portion 112. Corresponds to the length of.

  The frame 15 is assembled to the substrate 11 by first fitting the gripping claws 153a into the corresponding cutouts 112 and then bending the gripping claws 153a to the surface side of the substrate 11, whereby the frame 15 with respect to the substrate 11 is assembled. Is completed (see FIGS. 1, 2 and 4). The actual assembly of the frame 15 to the substrate 11 is performed with the movable assembly 16 incorporated in the frame 15.

  The frame 15 can be formed from an appropriate low-cost metal material as described above, but may be formed as an integrally molded product from another appropriate material such as a hard synthetic resin material. Since the substrate is fixed and held with an adhesive or the like, the gripping claws 153a and the like are not necessary.

  Referring to FIG. 9, only the movable assembly 16 is shown extracted from the slide switch 10 of FIGS. The movable assembly 16 includes a movable contact piece 17, elastic means or a leaf spring member 18 incorporated on the movable contact piece 17, and an operation knob 19 that holds both the members 17 and 18 movably together. .

  Referring to FIGS. 10 (1) and (2), the movable contact piece 17 extracted from the movable assembly 16 of FIG. 9 is shown as a front view and a side view, respectively.

  The movable contact piece 17 includes a long and flat main body 171 and a bent upright portion 172 in which both end portions 17a and 17b are bent to stand upward. A manufacturing example of the movable contact piece 17 will be described. After a material obtained by developing the movable contact piece 17 in a planar shape is obtained by punching from a relatively inexpensive good conductor metal such as a copper plate material, both ends thereof are bent. . Next, the bent material is plated with a metal excellent in arc discharge corrosion resistance, such as silver or a silver alloy (for example, silver nickel alloy, silver tungsten alloy, etc.), whereby the movable contact piece 17 is obtained. .

  The movable contact piece 17 is movable along the arrangement direction of the fixed contacts that are the head portions 121, 131, and 141 of the terminals 12, 13, and 14, and functions as an electrical contact plate for the fixed contacts 121, 131, and 141. By the movement, the electrical conduction between the terminals 12 and 13 and the electrical conduction between the terminals 13 and 14 are selectively switched. For example, as shown in FIG. 2, when the movable contact piece 17 is positioned across the fixed contacts 131 and 141, electrical conduction between the terminals 13 and 14 is obtained, while the movable contact piece is obtained. When 17 is moved from the position shown in FIG. 2 toward the fixed contact 121 and is positioned across the fixed contacts 121 and 131, electrical continuity between the terminals 12 and 13 is obtained.

  Referring to FIGS. 11 (1) and 11 (2), the elastic means, that is, the leaf spring member 18 extracted from the movable assembly 16 of FIG. 9, is shown as a front view and a plan view, respectively.

  As shown in FIG. 11 (1), the leaf spring member 18 is bent from a long material such as phosphor bronze, and has a substantially inverted V shape having a top portion 182 that is bent so that the central portion in the longitudinal direction protrudes upward. It has the shape of a letter or mountain. Each of the both ends 181 has a hole 181a as shown in FIG. When the leaf spring member 18 is assembled to the movable assembly 16 as shown in FIG. 9, the top portion 182 is locked to the lower surface of the operation knob 19, and both ends 181 are bent upright portions 172 of the movable contact piece 17. The movable contact piece 17 is engaged with the front end portion and the rear end portions 17a and 17b so as to be inserted through the 18 holes 181a.

  Referring to FIG. 9 again, the operation knob 19 functions to cause the slider switch 10 shown in FIGS. 1 to 4 to perform power on / off or circuit switching operation, and is made of a suitable synthetic resin material such as polycarbonate resin. It is formed as an integral molded product. The operation knob 19 includes a knob main body 191 formed of a solid block body, and an accommodating portion 192 that accommodates the movable contact piece 17 and the leaf spring member 18.

  As apparent from FIGS. 1, 2, and 3, when the movable assembly 16 is assembled to the slider switch 10, the knob body 191 of the operation knob 19 has a rectangular opening 151 a formed in the top plate 151 of the frame 15. It protrudes from the outside. As shown in FIGS. 2 and 3, the length of the rectangular opening 151 a in the longitudinal axis direction is longer than the corresponding length of the knob body 191, and the length corresponds to the moving range of the movable assembly 16. In short, when the knob main body 191 is manually operated, the movable assembly 16 moves within the movement range, whereby the switch operation of the slider switch 10 is performed. The switch operation that characterizes the present invention will be described in detail later.

  The accommodating portion 192 of the operation knob 19 has a lateral width corresponding to the distance between the pair of side plates 153 of the frame 15 and extends over a distance shorter than the length of the pair of side plates 153 (see FIG. 2 and FIG. 2). (See FIG. 9). The accommodating portion 192 has an accommodating space 193, and the movable contact piece 17 and the leaf spring member 18 are accommodated in the accommodating space 193. As shown in FIG. 9, in the center of the ceiling side wall surface of the accommodation space 193, a space 192 a for receiving the central protrusion of the leaf spring member 18 having a mountain shape, that is, the top 182, is formed. A space 192b for receiving the bent upright portion 172 of the movable contact piece 17 is formed on each of both end sides of the ceiling side wall surface of the space 193.

  Further, as shown in FIG. 9, convex ridges 192 c and 192 c are integrally formed on both edge sides of the upper surface of the accommodating portion 192 of the operation knob 19. For example, when the movable assembly 16 moves from the left position shown in FIG. 2 toward the right position, first, the right protrusion 192 c in FIG. 2 is formed on the back side of the top plate 151 of the frame 15. At this time, a so-called clicking sound is generated. Next, when the movable assembly 16 moves toward the left position in FIG. 2, the left protrusion 192 c in FIG. 2 gets over the left protrusion 151 b formed on the back side of the top plate 151 of the frame 15. A so-called click sound is generated. In short, the occurrence of such a clicking sound gives the operator a sense of moderation that the switch operation has been performed when the slider switch 10 is operated.

  When the movable assembly 16 described above is assembled in the space formed by the substrate 11 and the frame 15 as shown in FIG. 2, the movable contact piece 17 is fixed to the fixed contact 121 by the elastic force of the leaf spring member 18. And 131 or the fixed contacts 131 and 141 are kept elastically pressed. In FIG. 2, the movable contact piece 17 is elastically pressed against the fixed contacts 131 and 141. In this state, the leaf spring member 18 tilts the movable contact piece 17 by elastically pushing down one of the front end portion and the rear end portions 17a and 17b of the movable contact piece 16 toward the fixed contact side of the movable assembly 16. At this time, the other of the front end portion and the rear end portions 17a and 17b of the movable contact piece 17 acts on the movable contact piece so as to move away from the fixed contact side.

  FIG. 12 shows a modification in which the elastic means of FIG. 9 is constituted by a long plate member and a pair of elastic members instead of the plate spring. In this figure, the same reference numerals as those in FIG. 9 are used for members other than the members constituting the elastic means.

  As shown in FIG. 12, the long plate member 38 has a substantially inverted V shape, that is, a mountain shape, which is bent from a long material in the same manner as the plate spring member 18 of FIG. 9, and the plate spring member of FIG. Similarly to 18, it is mounted on the movable contact piece 17 and assembled to the movable assembly 16. However, the plate member 38 is not given springiness. As shown in the figure, a pair of elastic members 40 are disposed between the upper surface of both end portions of the plate member 38 and the space 192b on the lower surface of the knob main body 191, so that the movable contact piece 17 moves up and down elastically during movement. Is possible. The material of the elastic member 40 may be either metal or synthetic resin, and the shape may be any of a coil shape, a log shape, and a prismatic shape.

  Next, the switch operation of the slide switch according to the present invention will be described with reference to FIGS. 13 (1), (2), and (3). In these drawings, in order to clarify the characteristics of the switch operation of the slide switch according to the present invention, the fixed contacts 121, 131, 141 and the movable contact piece 17 are illustrated as geometric schematic diagrams, and the fixed contact 121 , 131 and 141 are inclined sharply in an exaggerated manner rather than actual.

  The positional relationship between the fixed contacts 121, 131, and 141 and the movable contact piece 17 in FIG. 13B is the same as the state shown in FIG. 2, and the movable contact piece 17 is located on the top of the mountain-shaped fixed contacts 131 and 141. The ridgelines 131a and 141a are always pressed by the leaf spring member (18). Here, when the movable contact piece 17 moves toward the fixed contact 121 on the left in the drawing, the horizontal movement of the movable contact piece 17 is maintained until the rear end portion of the movable contact piece 17 passes the ridge line 141a of the fixed contact 141. Is done. At this time, the horizontal movement of the movable contact piece 17 is a plane extending in parallel with the upper surface of the substrate 11 on which the fixed contacts 121, 131, and 141 are arranged, and from the common substrate 11 to the fixed contacts 121, 131, and 141. It is performed along a plane including ridgelines 121a, 131a, 141a at the same height.

  When the rear end portion of the movable contact piece 17 passes the ridgeline 141a of the fixed contact 141, the rear end portion of the movable contact piece 17 is ridgeline of the fixed contact 141 by the elastic pressing force of the leaf spring member (18 / see FIG. 9). While being pressed against the left inclined surface 141b in the drawing of 141a, it moves in the left direction in the drawing along this left inclined surface 141b. At this time, the movable contact piece 17 tilts clockwise with the ridge line 131a of the fixed contact 131 as a fulcrum.

  As shown in FIG. 13B, when the movable contact piece 17 moves to a position where the center position CP in the longitudinal direction coincides with the ridge line 131a of the fixed contact 131, the rear end portion 17b of the movable contact piece 17 is fixed contact. 141 reaches the lower position LP1 of the left inclined surface 141b.

  As soon as the central position CP of the movable contact piece 17 exceeds the ridge line 131a of the fixed contact 131, the movable contact piece 17 begins to tilt counterclockwise, and the rear end portion of the movable contact piece 17 is the inclined surface 141b on the left side of the fixed contact 141. Get away from. An arc is generated when the movable contact piece 17 is separated from the fixed contact 141. Therefore, the position LP1 below the inclined surface 141b on the left side of the fixed contact 141 is the arc generation position.

  On the other hand, as shown in FIG. 13 (3), when the movable contact piece 17 tilts counterclockwise and the tip 17 a comes into contact with the inclined surface 121 b on the right side of the fixed contact 12, an arc is generated at that time. The arc generation position is a lower position LP2 where the distal end portion 17a of the movable contact piece 17 comes into contact with the inclined surface 121b on the right side of the fixed contact 12.

  Further, when the movable contact piece 17 moves leftward toward the ridgeline 121a of the fixed contact 121, the distal end portion 17a of the movable contact piece 17 is fixed by the elastic pressing force of the leaf spring member (see FIG. 9 / FIG. 9). It moves on the inclined surface 121b toward the ridgeline 121a while being pressed against the right inclined surface 121b. Along with this, the movable contact piece 17 tilts clockwise.

  When the distal end portion 17a of the movable contact piece 17 reaches the ridgeline 121a of the fixed contact 121, the movable contact piece 17 returns to the horizontal position, and after the distal end portion 17a passes through the ridgeline 121a, the position shown in FIG. And stop at a symmetrical position. When the movable contact piece 17 moves toward the position shown in FIG. 13 (1), the reverse of the above is followed. That is, the movable contact piece 17 starts to move in the right direction in the drawing. First, an arc is generated when the tip end portion 17a moves away from the lower position LP2 of the inclined surface 121b on the right side of the fixed contact 121, and then the movable contact piece 17 An arc is generated when the rear end portion 17b contacts the lower position LP1 of the inclined surface 141b on the left side of the fixed contact 141 in the drawing.

  In short, in the slide switch according to the present invention, with respect to the arrangement interval of the fixed contacts 121, 131, and 141 and the length of the movable contact piece 17, the movable contact piece 17 has a longitudinal center position CP and a ridge line of the fixed contact 131. When tilted toward the fixed contact 121 or the fixed contact 141 at a position coincident with 131a, the tip end portion 17a or the rear end portion 17b inclined downward is the lower position LP2 or the fixed contact of the inclined surface 121b on the right side of the fixed contact 121 141 is configured to come into contact with a lower position LP1 of the inclined surface 141b on the left side of 141. Thus, the generation of an arc in the vicinity of the ridgeline 121a of the fixed contact 121 and the vicinity of the ridgeline 141a of the fixed contact 141 is prevented. Thereby, the fixed contacts 12, 13, and 14 and the movable contact piece 17 are formed from a relatively inexpensive good conductor metal such as copper, and a metal material such as silver or a silver alloy (for example, silver nickel alloy, excellent in arc discharge corrosion resistance) on the surface. By simply plating with silver-tungsten alloy or the like, the operating life of the fixed contacts 12, 13 and 14 and the movable contact piece 17 can be extended greatly, and a low-cost switch capable of withstanding a large amount of current can be obtained. It can be provided.

  In the above, the first embodiment in which a plurality of fixed contacts are linearly arranged has been described. However, the slide switch according to the present invention is not limited to this, and the embodiment has a plurality of fixed contacts arranged in, for example, an arc shape or a circle. Applicable to form.

  The second embodiment will be described with reference to FIGS. 14 (1) and 14 (2). In FIG. 14 (1), fixed contacts 52, 53, 54 arranged in an arc shape, and an array of these fixed contacts. A movable assembly 56 is shown that is movable along the direction. The movable assembly 56 has an operation member 59, and the operation member 59 includes a main body 591, an arm 592, and an operation dial shaft 593 (not shown).

  14 (2) shows a diagram in which the fixed contacts 52, 53, 54 and the movable assembly 56 of FIG. 14 (1) are symmetrically added with the shaft 593 of the operation member 59 as the center. From this figure, it is possible to switch two slide switches at the same time by one operating member 59. If the fixed contacts are arranged in a circle, four or more slide switches can be simultaneously operated by one operating member 59. It will be understood that the switching operation can be easily performed.

  The relationship between the structure and operation of the fixed contacts 52, 53, 54 and the movable assembly 56 in the second embodiment is the same as the structure of the fixed contacts 121, 131, 141 and the movable assembly 16 in the first embodiment and both. Same as relationship.

  Since the problem of contact melting and wear due to arc discharge has been improved, the slide switch can be widely used for applications using a relatively large capacity current that has not been used so far.

10 Slide switch 11 Substrate 12, 13, 14 Terminal 17 Movable contact piece 18 Leaf spring (elastic means)
19 Operation knob 121, 131, 141 Fixed contact 121a, 131a, 141a 1st contact part LP1, LP2 2nd contact part

Claims (6)

A plurality of fixed contacts arranged on the substrate; and a movable contact piece movable along the row of the fixed contacts, the movable contact pieces being two fixed contacts selected from the plurality of fixed contacts In the slide switch that electrically connects or disconnects the two selected fixed contacts by selectively contacting or separating the other fixed contact while constantly contacting one of the fixed contacts.
Elastic means for elastically pressing the front end portion and the rear end portion in the moving direction of the movable contact piece toward the fixed contact side;
Each of the fixed contacts has a first contact portion whose contact surface with the movable contact piece is located on a plane parallel to the upper surface of the substrate at a height from the substrate common to the other fixed contacts, A slide switch comprising: a second contact portion located on an inclined surface descending from the first contact portion. The slide switch includes an operation knob for holding the movable contact piece on a lower surface side,
The elastic means is provided between the operation knob and the movable contact piece, and one of the front end portion and the rear end portion of the movable contact piece is arranged on the fixed contact side according to the movement position of the movable contact piece. The movable contact piece is tilted down elastically toward the movable contact piece and acts on the movable contact piece so that the other of the front end portion and the rear end portion moves away from the fixed contact side. The slide switch according to 1.   The elastic means is constituted by a leaf spring, and the leaf spring is bent so that the central portion in the longitudinal direction protrudes upward and is locked to the lower surface of the operation knob, and both longitudinal ends are the movable contact pieces. The slide switch according to claim 2, wherein the slide switch is provided so as to be engaged with the front end portion and the rear end portion.   The elastic means is composed of a long plate member and a pair of elastic members, and the plate member is bent so that the central portion in the longitudinal direction protrudes upward and is locked to the lower surface of the operation knob f. And both ends in the longitudinal direction are provided so as to be engaged with the front end portion and the rear end portion of the movable contact piece, and each of the pair of elastic members has a front end portion or a rear end in the moving direction of the operation knob. The slide switch according to claim 2, wherein the slide switch is disposed between a lower surface of the end portion and a corresponding upper surface of the front end portion or the rear end portion of the plate member.   The slide switch according to any one of claims 1 to 4, wherein the inclined surface on which the second contact portion of the fixed contact is located is a flat surface.   The slide switch according to any one of claims 1 to 4, wherein the inclined surface on which the second contact portion of the fixed contact is located is formed into a curved surface.

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