JPH09147652A - Contact structure for sliding switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the carbonization of the slide face of a pole plate due to arc by providing the pole plate with a thin groove portion narrower than the width of the slide contact portion of a movable armature and a cavity portion peripherally provided in a fixed contact. SOLUTION: A slide-movable armature 1 has the end provided with a slide contact portion 1a put in slide contact with the plate face 2e of a pole plate 2 and a contact portion put in contact with a fixed contact 3a. In the pole plate 2, a groove 2a is made right under the center of the slide contact portion 1a of the movable armature 1. The groove 2a consists of a thin groove portion 2c narrower than the width L1 of the slide contact portion 1a of the movable armature 1 and a cavity portion 2d peripherally provided in the fixed contact 3a. A terminal 3 which has the fixed contact 3a at one end and a connection terminal at the other end in one unit is inserted and molded in the pole plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding switch contact structure.

[0002]

2. Description of the Related Art Conventionally, as a technique of this type, there is a technique disclosed in Japanese Utility Model Publication No. 46-4915. According to this technique, a groove and an auxiliary groove are formed on a pole board, and a circular fixed contact is installed at a position where the groove and the auxiliary groove intersect. The diameter of the fixed contact is a circular screw wider than the width of the groove and the auxiliary groove. The movable contact piece slides on the groove and the fixed contact. The width of the movable contact piece is made wider than the width of the groove so that the movable contact piece slides on the upper surface of the pole plate and the upper surface of the fixed contact without backlash.

[0003]

However, the above-mentioned prior art has a problem that the number of parts and the number of assembling steps are large because the fixed contact is a screw which is a member different from the terminal. The diameter of the fixed contact is wider than the width of the groove. In the movable contact piece, a sliding contact portion is also in sliding contact with the pole board at the wide portion of the fixed contact, and the other central portion is in sliding contact only with the fixed contact. When the movable contact piece comes into contact with the fixed contact and turns on,
The movable contact piece is in contact with the pole plate and the fixed contact piece. The pole board is
There is a problem that the resin is carbonized by the arc generated when the movable contact piece comes into contact with the fixed contact and the voltage drop becomes large.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been devised to solve the above-mentioned problems of the prior art. A sliding contact portion that slides and contacts the surface of the pole plate at its tip, and a fixed portion. A movable contact piece having a contact point contacting portion for contacting a contact, a pole plate having a groove formed below the contact point contact portion of the movable contact point, and a width narrower than the width of the sliding portion of the movable contact point. Of the narrow groove portion and a void portion exposing the fixed contact on the bottom surface, the fixed contact at one end, the connection terminal portion integrally formed at the other end, and a terminal insert-molded in the pole board, Become.

Further, the fixed contact of the present invention is arranged on substantially the same center line of the narrow groove portion and has a width narrower than the width of the narrow groove portion.

Further, according to the present invention, the terminal is formed of a conductive plate member, and the fixed contact is of an inverted container shape formed by deep drawing the terminal with a die.

Further, in the present invention, the terminal is formed of a conductive plate member, and the fixed contact is an end surface of the upper end of the terminal.

Further, according to the present invention, the groove forms a side wall on a boundary line between the narrow groove portion and the void portion, and the fixed contact has its end portion arranged on the boundary line.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail below with reference to FIGS. 1, 2, 3, and 4. 1 is the board surface 2 of the pole board 2
It is a movable contact piece that slides on e and fixed contact 3a. The movable contact piece 1 is, for example, an inverted rake-shaped conductive leaf spring member formed by integrally molding a plurality of protruding pieces. The movable contact piece 1 includes a sliding contact portion 1a which is in sliding contact with the board surface 2e of the pole board 2 on both sides of the tip of the protruding piece, and a fixed contact 3a at the central portion thereof.
It has a contact point contact portion 1b that contacts with.

The number of the movable contact pieces 1 and the fixing means are not particularly limited. The number of protruding pieces of the movable contact piece 1 may be increased or decreased according to the electric circuit using the switch. Further, the movable contact piece 1 may be attached to a movable plate (not shown) or may be insert-molded on the movable plate. In addition, the movable plate may include a plurality of movable contact pieces 1.

When the sliding contact portion 1a is OFF as shown in FIGS. 2 and 4, both ends are located on the board surface 2e of the pole board 2. When the sliding contact portion 1a is ON, the central contact portion 1b is located on the fixed contact 3a. Width L of sliding contact part 1a
1, the width L2 of the narrow groove portion 2c, and the width L3 of the fixed contact 3a
Have a relationship of L1>L2> L3 as shown in FIG. 4, and are arranged on the same center line. L4 is the length from the fixed contact 3a to the side wall of the groove 2a, and shows the length of the portion where the movable contact piece 1 does not come into contact with other objects.

The pole board 2 is formed of a resin material in which the terminals 3 are insert-molded. The pole board 2 has a fixed contact 3 on the upper surface.
a is led out and a groove 2a is bored, and a connector 2 is formed on the lower surface.
b is integrally molded.

The groove 2a is a narrow groove portion 2c formed right below the center of the sliding contact portion 1a of the movable contact piece 1 which moves linearly.
And a space 2d formed around the fixed contact 3a of the terminal 3
, And are connected in series. The depth H1 of the groove 2a is equal to that of the fixed contact 3
The height is the same as the height H2 of a. The groove 2a forms a side wall 2f on the boundary line XX between the narrow groove portion 2c and the void portion 2d. On the boundary line XX, the fixed contacts 3a are arranged so that their ends are aligned with each other.

The narrow groove portion 2c is for collecting the abrasion powder formed by the sliding contact between the board surface 2e and the movable contact piece 1 by dropping below the sliding contact surface. The width L2 of the narrow groove portion 2c is
It is narrower than the width L1 of the sliding contact portion 1a of the movable contact piece 1. The narrow groove portion 2c is formed in accordance with the center line of the movable contact piece 1 that slides, and is formed according to the number of contact contact portions 1b of the movable contact piece 1. The movable contact piece 1 is OF
When F, the contact contact portion 1b is on the narrow groove portion 2c.

The gap 2d is formed by the fixed contact 3a and the movable contact piece 1.
Abrasion powder formed by sliding contact with and is dropped below the sliding surface to be stored. The void portion 2d is continuous with the narrow groove portion 2c and exposes the fixed contact 3a on the bottom surface on the extension line of the center line of the narrow groove portion 2c. The void 2
The width, width and depth of d are not particularly limited.

On both sides of the narrow groove portion 2c on the board surface 2e, there are sliding surfaces 2g on which the sliding contact portion 1a of the movable contact piece 1 slides. The board surface 2e and the fixed contact 3a are on the same plane. Terminal 3
Are formed of a conductive plate member, one end of the connection terminal portion 3b projects into the connector 2b, and the other end of the fixed contact 3a is exposed from the bottom surface of the groove 2a and is integrally formed.

As shown in FIGS. 1 to 3, the fixed contact 3a is in the shape of an inverted container formed by deep-drawing one end of the terminal 3 with a press. The fixed contact 3a is formed integrally with the terminal 3, the fixed contact 3a is arranged substantially on the center line of the narrow groove portion 2c, and the width L3 is the width L of the narrow groove portion 2c.
It is a plate-shaped member shorter than 2. Further, the fixed contact 3a is, for example, an ellipse whose end is arranged on the boundary line XX. The fixed contact 3a makes the position of the upper surface on which the movable contact piece 1 slides coincide with the board surface 2e of the pole board 2.

The first embodiment of the present invention is configured as described above, and the operation will be described in detail with reference to the accompanying drawings. The movable contact piece 1 is in the position A of FIG. 3 when it is OFF. In the movable contact piece 1, both sides of the sliding contact portion 1a are on the board surface 2e.

From this position, the boundary line X- of the position B, which is slid toward the fixed contact 3a along the narrow groove 2c and moved by the distance S2.
It separates from the board surface 2e on X and contacts the end of the fixed contact 3a. In the movable contact piece 1, at the moment when the contact point 1b contacts the fixed contact point 3a, an arc is generated from the contact point between the contact point 1b and the fixed contact point 3a.

The contact contact portion 1b of the movable contact piece 1 contacts only the fixed contact 3a as shown in FIG. The contact point 1
The sliding contact surfaces 1a on both outer sides of b are in sliding contact with only the board surface 2e.
Then, there is a gap of length L4 between the contact point contact portion 1b and the board surface 2e with which the sliding contact portion 1a contacts. Therefore, when the arc occurs, the board surface 2 made of resin or the like
Prevent e from being carbonized in the arc.

Further, the contact point contact portion 1b and the sliding contact portion 1a.
Since there is a gap of length L4 between the board surface 2e and the contact surface 2e, it is possible to drop the abrasion powder generated by the sliding movement of the movable contact piece 1 into the groove 2a and prevent the contact failure due to the abrasion powder.
Further, since the movable contact piece 1 slides smoothly without rattling since the board surface 2e and the upper surface of the fixed contact 3a are on the same plane when passing on the boundary line XX, the operation feeling of the operation knob is improved. It is possible to be good.

As shown in FIG. 3, the movable contact piece 1 further moves a distance S3 and stops at the position C, and the state where the switch is turned on is maintained.

Next, the second aspect of the present invention will be described with reference to FIGS. 5 and 6.
Examples will be described in detail. In addition, the same shape as that of the above-described first embodiment of the present invention uses the same numeral, and the description thereof will be omitted. In the second embodiment of the present invention, the terminal 3 in the first embodiment is replaced with the terminal 4 shown in FIGS. That is, in the second embodiment of the present invention, the terminal 4 having the end surface 4b at one end as the fixed contact 4a and the other end as the connection terminal portion 4b provided in the connector 2b is provided.

The movable contact piece 1 is the same as that of the first embodiment.
The pole board 2 has the same groove 2a, connector 2b, and
It has a narrow groove portion 2c, a void portion 2d, and a board surface 2e. The terminal 4 is formed by pressing a thick conductive plate as shown in FIGS. The terminal 4 is formed of a conductive thick plate member. The terminal 4 has one end surface 4
The fixed contact 4a of b is exposed from the space 2d, the other connection terminal portion 4b is projected into the connector 2b, and the pole board 2 is insert-molded. The height H2 of the fixed contact 4a is equal to that of the groove 2a.
Is the same as the depth H1. The surface of the fixed contact 4a is flush with the board surface 2e.

The second embodiment of the present invention is constructed as described above. The operation is the same as that of the first embodiment of the present invention described above, and the description thereof will be omitted.

[0026]

Since the present invention is constructed as described above, the following effects can be obtained. (1) According to the invention of claim 1, a movable contact piece having a sliding contact portion that slides and contacts the surface of the pole board at a tip thereof, and a contact contact portion that contacts a fixed contact, and a contact contact of the movable contact piece. A pole plate having a groove formed in a lower portion of the portion, a narrow groove portion having a width narrower than the width of the sliding portion of the movable contact piece, and the groove having a void portion exposing a fixed contact on the bottom surface, Since the fixed contact is formed at one end and the connection terminal is integrally formed at the other end, and the insert is formed on the pole board, contact defects caused by abrasion powder generated by sliding of the movable contact piece are prevented. It can be prevented. (2) According to the invention of claim 2, the fixed contacts are arranged on substantially the same center line of the narrow groove portion and the width is formed narrower than the width of the narrow groove portion. It is possible to prevent the board surface of the pole board from being carbonized and causing a large voltage drop. (3) According to the invention of claim 3, the terminal is formed of a conductive plate member, and the fixed contact is an inverted container shape formed by deep-drawing the terminal with a press. Can be easily manufactured. (4) In the invention of claim 4, the terminal is formed of a conductive plate member, and the fixed contact is an end surface of the upper end of the terminal.
The structure of the terminal can be simplified and the cost can be reduced. (5) In the invention of claim 5, the groove forms a side wall on a boundary line between the narrow groove portion and the void portion, and the fixed contact has its end portion arranged on the boundary line, so that the switch is turned on, and OFF
When doing so, the movable contact piece can be prevented from rattling, the movement of the movable contact piece can be made smooth, and the operating feeling of the knob can be improved. In addition, the movable contact piece slides on the sliding surfaces on both sides of the narrow groove when the switch is OFF, and contacts the fixed contact when the switch is turned ON and emits an arc, thus sliding the pole plate made of resin. It is possible to prevent the surface or the like from being carbonized by the arc.

[Brief description of the drawings]

FIG. 1 is a drawing showing a first embodiment of the present invention and is a perspective view of a movable contact piece and a pole plate.

FIG. 2 is a drawing showing a first embodiment of the present invention and is an enlarged perspective view of a main part.

FIG. 3 is an enlarged cross-sectional view taken along line YY of FIG.

FIG. 4 is a drawing showing a first embodiment of the present invention, and is an enlarged cross-sectional view of a main part showing a state when a switch is turned on.

FIG. 5 is a drawing showing a second embodiment of the present invention and is an enlarged perspective view of a main part.

6 is an enlarged cross-sectional view taken along line ZZ of FIG.

[Explanation of symbols]

 1 movable contact piece 1a sliding contact part 1b contact contact part 2 pole board 2a groove 2b connector 2c narrow groove part 2d void part 2e board surface 2f side wall 3,4 terminal 3a, 4a fixed contact 3b, 4c connection terminal part 4b end surface

Claims (5)

[Claims] 1. A sliding contact portion (1a) which slides and contacts the sliding surface of a pole plate (2) with a plate surface (2e), and a contact contact portion (1b) which contacts fixed contacts (3a) and (4a). A movable contact piece (1), a pole plate (2) having a groove (2a) formed below the contact contact portion (1b) of the movable contact piece (1), and the movable contact piece (1). ) Width (L1) of the sliding portion (1a)
The groove (2a) consisting of a narrow groove (2c) having a narrower width (L2) and a void (2d) exposing the fixed contacts (3a), (4a) on the bottom surface, and the fixed contact (3a) at one end. ), The connection terminal portion (3
A contact structure for a sliding switch, characterized in that b) is integrally formed and terminals (3) and (4) are insert-molded on the electrode plate (2). 2. The invention according to claim 1, wherein the fixed contacts (3a), (4a) are the narrow groove portions (2).
A contact structure of a sliding switch, wherein the contact structure is arranged on substantially the same center line of c) and has a width (L3) narrower than a width (L2) of the narrow groove portion (2c). 3. The invention according to claim 1 or 2, wherein the terminal (3) is formed of a conductive plate member, and the fixed contact (3a) is formed by pressing the terminal (3) with a die. A contact structure for a sliding switch, which is formed in a reverse container shape by drawing. 4. The invention according to claim 1 or 2, wherein the terminal (4) is formed of a conductive plate member, and the fixed contact (4a) is an end surface () of an upper end of the terminal (4). 4b) is a contact structure of a sliding switch. 5. The invention according to claim 1, 2, 3 or 4, wherein the groove (2a) is a sidewall on a boundary line (XX) between the narrow groove portion (2c) and the void portion (2d). (2f) is formed, and the fixed contacts (3a) and (4a) are arranged such that their ends are located on the boundary line (XX).