JP3179816B2 - switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to switches such as pull switches.

[0002]

2. Description of the Related Art A switch of this type is disclosed in
There was something like that found in No. 85573. FIGS. 8 to 10 show this conventional example, which is formed by embedding studs on a stepped portion 4 formed by separating a rib 2 and a serrated stepped portion 3 at the bottom of a main body 1 made of an insulator. A plurality of fixed contacts 5, a shaft body 6 made of a metal conductor, a rotating body 9 made of a conductor having two movable contact pieces 7 and a plurality of claws 8,
A handle fitting 12 having a downward tongue piece 10 and an engagement piece 11, a handle 13 made of an insulating material, and a coil spring 14
And a holding member 15, and the shaft 6 is supported at both ends by a holding member 15, both ends of which are supported by the main body 1, and the body 1. The rotating body 9, the handle metal 12, and the handle 13 are supported by the shaft 6. The handle fitting 12 and the handle 13 are rotatably fitted, and the engaging piece 11 of the handle fitting 12 is engaged with the notch 13a of the handle 13 so that they rotate together. Are fixed to a holding bracket 15 and a handle 13 at both ends of the coil spring 14.
Plays a role of always pressing the rotating body 9 against the bottom of the main body 1 via the handle 13 and the handle fitting 12, and at the same time applying a restoring force when the handle 13 is rotated.

When the handle 13 is turned by the drawstring 16, the downwardly extending tongue 10 of the handle fitting 12 is rotated.
The rotating body 9 is rotated by being caught by the claw 8 of the above, and the movable contact provided on the two movable contact pieces 7 is rotated by one step while sliding on the fixed contact 5 of the fan-shaped section. When the pulling string 16 is released, the rotating body 9 stops at that position, and the tongue piece 10 of the handle fitting 12 slides on the rotating body 9 to remove the handle 1.
Only the handle 3 and the handle fitting 12 return to the original state by the return force of the coil spring 14. When the drawstring is pulled again, the rotating body 9 moves one step further by the same operation as before.

The power supply path of this conventional switch includes a metal shaft 6 erected on a body 1 made of an insulator, a metal rotator 9, and a movable contact provided integrally with the rotator 9. The fixed contact 5 is in contact with the movable contact of the piece 7, and the terminal plate 17 is connected to the fixed contact 5 from outside the main body 1.

[0005]

In the case of the above prior art, the rotating body 9 is rotatably extrapolated to the shaft body 6;
Therefore, when contact between the shaft body 6 and the rotating body 9 becomes unstable, the shaft body 6, a metal pressing plate 15 connecting the tip of the shaft body 6, and the pressing plate 15 and the rotating body 9 A coil spring 14 contracted between a handle 8 for intermittently rotating the coil 9, a rotating body 9 with which the lower end of the coil spring 14 contacts, a movable contact of the movable contact piece 7, and a fixed contact 5 Current will flow through the path. Here, since the coil spring 14 requires mechanical strength, for example, a steel material such as a stainless wire is used. However, when electricity flows, the coil spring 14 generates heat and burns the handle 8 or the main body 1 made of an insulator. was there.

The contact pressure between the shaft body 6 and the rotating body 9 and the contact pressure between the movable contact 4 and the fixed contact 5 are obtained by the twisting force and the compressive force of the coil spring 14, respectively. However, there is a problem that the twisting force between the shaft body 6 and the rotating body 9 is unstable, and it is difficult to control the contact pressure. It is also conceivable to provide an auxiliary spring 18 in which one is held between the shafts 6 and the other is in contact with the back surface of the rotating body 9, and this auxiliary spring 18 is used as a bypass for the power supply path.

In this case, the shaft body 6 and the auxiliary spring 18 must be strongly sandwiched, which makes it difficult to assemble, and a force against the contact pressure between the movable contact 4 and the fixed contact 5 acts. There has been a problem that the contact pressure is weakened and the contact is likely to be unstable. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to easily control contact pressure at an electric contact portion and to use only one current path. An object of the present invention is to provide a switch that does not generate heat due to energization in an electric circuit and can give a contact pressure between a movable contact and a fixed contact without waste.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an insulator having an erect shaft and a plurality of fixed contacts arranged on the same circumference around the axle. A main body formed by the above, a stepped portion divided by a sawtooth-shaped step in the circumferential direction around the shaft body, and a rotatable externally fitted to the shaft body, and a sawtooth-shaped stepped portion of the stepped portion by rotation. A metal rotating body that contacts and separates the movable contact piece provided with the fixed contact while sliding, and an operation unit that intermittently drives the rotating body by locking the rotating body in one direction and rotating the rotating body. It includes a return spring for returning the operation unit, and a common contact plate made of a leaf spring that is electrically connected to and contacts the rotating body and presses the rotating body.

[0009]

According to the structure of the present invention, the current path is constituted by a common contact plate, a rotating body, a movable contact piece and a fixed contact, and the contact pressure at the electric contact portion is the spring pressure of the common contact plate. It is easy to control the contact pressure,
The strength can be easily changed by changing the thickness of the common contact plate.

In addition, the above-mentioned current path is the only current path,
Therefore, when the current is not conducted through the current path, current does not flow through another path, and thus careless heat generation does not occur. Furthermore, since the rotating body is directly pressed by the common contact plate, the pressing portion comes close to the movable contact piece, and the contact pressure between the movable contact piece and the fixed contact can be transmitted without waste.

[0011]

The present invention will be described below with reference to examples. (Embodiment 1) FIG. 1 is an exploded perspective view of this embodiment, and FIG. 2 is an assembled sectional view thereof.
Is erected by embedding one end of a metal shaft body 6 on the inner bottom surface, and is provided on the inner bottom surface of the main body 1 around the shaft body 6 around the shaft body 6 by the ribs 2 and the saw-toothed step portions 3 in the circumferential direction. , A stepped portion 4 having seven fan-shaped sections is integrally provided. And a plurality of stud-shaped fixed contacts 5 embedded and formed on the sector-shaped section.
And two movable contact pieces 7 which are rotatably externally mounted on the shaft body 6 and are integrally formed so as to protrude outward on both sides from the peripheral portion, and a direction perpendicular to a position where the movable contact pieces 7 project. A rotating body 9 made of a conductor having a feeding claw 8 integrally protruded from a peripheral portion of the rotating body 9 and an engaging groove 27 for locking the feeding 8 in one direction are formed on the peripheral edge. A handle 21 in which a shaft 19 formed by swelling by drawing at the center of the body 9 is rotatably externally inserted into a shaft hole 20, and the upper surface of the shaft 19 protruding higher than the upper surface of the handle 21, FIG. As shown in FIG. 3, a contact portion 22 which elastically contacts and holds the rotating body 9 and a notch 23 which penetrates the shaft body 6 penetrating the shaft portion 19 are formed at the front portion, and the rear end is bent downward to be bent. The piece is supported between the inner surface of the main body 1 and a rib 24 erected from the bottom of the main body 1, A plate spring terminal portions 25a provided was penetrate outside from the bottom of the main body 1 to the common terminal plate 25
And a return spring 26 formed of a torsion spring for hooking the locking ring 26a on the hooking piece 21a of the handle 21 and fixing the one end 26b to the main body 1.

When the handle 21 is rotated by a drawstring (not shown), the engaging groove 27 of the handle 21 is hooked on the claw 8 of the rotator 9 and the rotator 9 rotates. The movable contact provided on the movable contact piece 7 rotates one step while sliding on the fixed contact 5 in the fan-shaped section. When the pulling string is released, the rotating body 9 stops at that position, the handle 21 slides on the rotating body 9, and only the handle 21 returns to the original state by the return force of the return spring 26. When the drawstring is pulled again, the rotating body 9 moves one step further by the same operation as before.

In this manner, the fixed contact 5 which is in contact with the movable contact is sequentially switched, and the conduction path is the common terminal plate 25, the rotating body 9, the movable contact piece 7
, The fixed contact 5 and the terminal plate 16, and the contact pressure of the electrical contact is obtained by the strength of the common terminal plate 25. As shown in FIG. 4, both sides of the common terminal plate 25 may be separated to form a handle pressing portion 28, and the upper surface of the handle 21 may be pressed by the handle pressing portion 26 during assembly.

As shown in FIGS. 5 and 6, the shaft portion 19 of the rotating body 9 is formed by curling so as to stabilize its height and the contact surface of the common terminal plate 25 with the contact portion 22. good. Furthermore, as shown in FIG.
The contact portions 22A and 22B are provided on both sides of the common terminal plate 25 so as to press the upper surface of the rotating body 9 instead of pressing the upper surface of the rotating member 9.
May be formed.

[0015]

According to the present invention, there is provided a main body made of an insulator having a plurality of fixed contacts arranged on the same circumference with the shaft as a center, and the shaft as a center. A movable contact piece which is rotatably externally mounted on the shaft body, and which is provided while sliding the saw-tooth-shaped step portion of the step seat portion by rotation. A rotating body made of metal that is brought into contact with and separated from the fixed contact, an operating section that is locked to the rotating body in one direction and intermittently drives the rotating body, a return spring that returns the operating section, and a rotating body. Since it is composed of a common contact plate made of a leaf spring that is in contact with and electrically connected and presses the rotating body, the conduction path is configured as a common contact plate, a rotating body, a movable contact piece, and a fixed contact. The contact pressure at the contact point is obtained by the spring pressure of the common contact plate, Has the effect that the strength can be changed by changing the thickness of the common contact plate, etc., and the above-mentioned current path is the only current path. If it is no longer possible, the current will not flow through other paths, so there is an effect that inadvertent heat generation does not occur.In addition, since the rotating body is directly pressed by the common contact plate, the pressing part is close to the movable contact, There is an effect that the contact pressure between the movable contact and the fixed contact can be transmitted without waste.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view in which a main part of an embodiment of the present invention is partially omitted and broken.

FIG. 2 is a cross-sectional view of one embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a main part of one embodiment of the present invention.

FIG. 4 is a perspective view of a common terminal board according to another embodiment of the present invention.

FIG. 5 is a perspective view of a rotating body according to another embodiment of the present invention.

FIG. 6 is a partially omitted cross-sectional view of a main part of another embodiment of the present invention.

FIG. 7 is an exploded perspective view of a main part according to another embodiment of the present invention, in which some parts are omitted.

FIG. 8 is a perspective view of a conventional example.

FIG. 9 is a sectional view of a conventional example.

FIG. 10 is an exploded perspective view of a conventional example, with a part omitted and broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 4 Step seat part 5 Fixed contact 6 Shaft body 7 Movable contact piece 8 Claw 9 Rotating body 16 Terminal plate 19 Shaft part 21 Handle 22 Contact part 25 Common terminal plate 27 Engagement groove

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 17/16-17/22 H01H 17/06

Claims (1)

(57) [Claims] A main body formed of an insulator having a plurality of fixed contacts arranged on the same circumference with the shaft as a center; and a circumferential direction centered on the shaft. A movable contact piece which is rotatably externally mounted on the shaft body and is provided with the movable contact piece provided while sliding on the sawtooth-shaped step portion of the stepped seat portion by rotation. A rotating body made of metal to be brought into contact with and separated from the rotating body, an operating unit that is locked in one direction to the rotating body and drives the rotating body intermittently, a return spring that returns the operating unit, A switch comprising: a common contact plate which is electrically connected and is a leaf spring for pressing a rotating body.