JPH0290426A - Multipolar electric switch - Google Patents

Abstract

PURPOSE:To prevent a contact from opening and make it small in size by installing a loop-like flexible conductor at a movable contact and coaxially moving a crossbar and a toggle link commonly used to the respective poles clockwise and counter-clockwise to perform switching operation. CONSTITUTION:A multipolar electric switch is equipped with a fixed contact 1 on a substrate 100 made up of insulating material. A movable contact 3 is circularly moved clockwise and counter-clockwise by means of the first toggle link 23 and the second toggle link 6 contact with and separate from the fixed contact 1. The movable contact 3 is integrally connected to a movable contact supporting member 5 supported on a frame 8 such that the shaft can be rotated, a link 6 and a shaft 7. A loop-like flexible conductor 15 is connected to a connecting section installed at a tail end of the contact 3. A contact spring which provides contact pressure of the contact 3 is made up of the first spring 18a and the second spring 18b. A crossbar 26 which interlocks each pole is demountably supported such that an arm 27 like a shape of 'U' integrally installed with the crossbar 26 has the same supporting point of circular movement as the link 23.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a multipolar electrical switch, and is particularly applicable to electromagnetic contactors, circuit breakers, and the like.

Conventional technology Generally, when a large current such as a short circuit current is passed through a closed contact device of an electrical switch, an electromagnetic reaction bowl phenomenon occurs between the contacts due to current concentration in the contact portion, causing an arc. , there is a problem that the contacts may melt or weld. One way to solve this problem is to use the electromagnetic force generated in the contactor device and convert the acting force into a pressing force on the contactor to cancel the electromagnetic reaction force. There are several other methods for such means, but the movable contactor is of a rotating type, a contact part is connected to one end and a flexible lead is connected to the other end, and the flexible lead forms a loop. The electromagnetic force that tends to expand this loop when a large current is applied is transmitted to the movable contact, and the contact pressure is increased using the rotation axis of the movable contact as a fulcrum. There is. However, even with this method, a strong reaction force, which is the result of the electromagnetic reaction force and the electromagnetic force of the loop, acts on the rotating shaft of the movable contact and the opening/closing mechanism at the preceding stage, causing deformation or retraction of the mechanism. , floats up and separates, causing melting and arcing. In order to prevent this phenomenon, a toggle link mechanism is used for the opening/closing operation mechanism, and the link configuration is made as close to a straight line as possible in the closed state to gradually reduce the amount of reaction force transmitted to the operation mechanism. A high force toggle link mechanism is used in conjunction with a flexible lead loop configuration to prevent electromagnetic repulsion of the contacts.

Problems to be Solved by the Invention As mentioned above, the toggle link 8 has a flexible lead formed into a loop shape to prevent the electromagnetic reaction force of the contact and to increase the closing force! In the conventional configuration that uses a fence, the crossbar needs to be thicker to prevent the crossbar from curving due to the electromagnetic force generated in the contactor, causing the contactor to float and arc, resulting in a large switch. There are drawbacks to becoming In addition, in order to prevent phenomena such as levitation, separation, melting, and arcing of the contacts, it is necessary to prevent electromagnetic force from being transmitted to the opening/closing mechanism via the crossbar, and to ensure that the toggle link mechanism It is necessary to securely support the fixed frame provided for each pole, and all shafts, including the pins that connect the toggle links, must be firmly installed, and for this purpose, it is necessary to increase the shaft diameter, etc. Although required, it is preferable to apply shear stress rather than bending stress to the shaft in order to avoid increasing the size.

Therefore, the first object of the present invention is to solve the above-mentioned problems by compensating for the electromagnetic reaction force generated in the contact by a loop-shaped flexible conductor provided on the movable contact to open the contact. The frame supports the multi-pole toggle link to prevent separation and prevent the strong electromagnetic force transmitted to the toggle link mechanism from being released.It is compact and has improved contactor short-circuit current resistance. The purpose of the present invention is to provide a multipolar electric switch.

In order to reliably support the above-mentioned toggle link mechanism, when providing a multi-pole frame that serves as a support part for the toggle link, conventionally, as shown in the explanatory diagram of the four-cylinder mechanism in FIG. A first toggle link 201 is rotatably supported by a support shaft 202 on a frame 200 provided at a pole, and a cross bar 203 that interlocks the multiple poles is at a position away from the support shaft 202 of the first toggle link 201. The crossbar 2 is provided so as to be rotatably supported separately at the
03 and one end of the first toggle link 201 are connected by connecting shafts 206 and 207, respectively, by a connecting link 205. The cross bar 2 serves as the support shaft 202 of the toggle link 201 of No. 1 and the support shaft of the link arm 204.
03 forms a four-cylinder mechanism with a fixed link.

Such a four-cylinder mechanism is generally applied to a method of separately linking multiple poles. With such a four-tube mechanism, dimensional errors in parts occurring between the respective pole tiles can be absorbed by the rotation of the cross bar 203 that interlocks the multi-poles, allowing smooth operation. However, the support shaft 202 of the first toggle link 201 and the cross bar 203, which is the support shaft of the link arm 204 on the cross bar 203, are separated from each other, resulting in a disadvantage of increased size.

In addition, the present invention provides a first toggle link as an effective means to achieve the above-mentioned first objective and to reduce the size of the electric switch without using a four-cylinder mechanism, particularly to limit the depth dimension of the electric switch. A method is adopted in which the multi-pole toggle link is directly operated by a cross bar that has the same fulcrum as the frame, but simply fixing the cross bar to the multi-pole toggle link causes manufacturing errors in the frame, toggle link, and cross bar. Because of this, dimensional deviations occur between each pole phase tile, and 1, that is, J and "
Disadvantages such as "kinking" occur and the shaft is compressed and smooth rotation cannot be obtained. The cause of this is that when the crossbar is directly supported on all toggle links, the bearings of the toggle links are connected to the pair of left and right frames of the contact device for each pole and the pair of left and right opening/closing mechanisms installed side by side on the contact device. This is because, in the case of a large number of bearings, for example, a three-pole electric switch, the number of support points by the frame is as many as eight, resulting in slight differences in the respective axes.

As a means of solving this problem, the crossbar and toggle link were designed to be supported concentrically, separating the two, omitting some of the crossbar support parts, and creating a large number of frame groups. It is sufficient to select a small number of frames spaced apart from each other so as not to impede rotation, and to provide pivot support. In addition, in order to operate the toggle link with the crossbar, it is sufficient to provide an arm at each pole position of the crossbar and connect the two via pins, etc., but this connection cannot be achieved by pin connection by simple fitting. The difference in distance between the toggle link at the connection point and the axis of the crossbar, as well as the misalignment of both axes themselves, causes "clogs" and "kinks" again, and the effect of separating the two members disappears, and the initial purpose is lost. Since this cannot be achieved, it becomes necessary to absorb the dimensional error in the radial direction at the connection point between the two. This solution is achieved by forming at least one of the connecting points of the crossbar and the multipolar toggle link into a radially extending slotted hole.

Therefore, a second object of the present invention is to provide a multipolar electric switch in which smooth rotation of the crossbar and virtually concentric coupling between the crossbar and the toggle link are achieved. be.

Means for Solving the Problems In order to achieve the above-mentioned first and second objects, according to the present invention, a multi-pole electric switch includes a fixed contact for each pole,
A movable contact device that is rotated and operated to open and close by a toggle link mechanism consisting of a pair of first and second toggle links, and a frame that supports one end of the first toggle link are arranged in a multipolar manner on an insulating substrate. a movable contact support member arranged side by side and with the movable contact device rotatably supported on the frame; a movable contact support member rotatably supported by the movable contact support member and having a contact portion at one end and another A movable contact having a connection portion at an end, and a flexible conductor and a contact spring connected to the connection portion of the movable contact and formed in a loop shape surrounding the rotation axis of the movable contact support member. The first toggle link is operated to the open/close position by rotation of a crossbar common to each pole that rotates concentrically with the first toggle link.

Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Embodiment FIGS. 1 to 4A and 4B of the drawings show an embodiment of the multipolar electric switch of the present invention.

As shown in the figure, in the multipolar electric switch of the present invention, a fixed contact 1 having a fixed contact 2 at one end is mounted on a substrate 100 made of an insulator. In addition, a movable contact 3 having a movable contact 4 that comes into contact with and separates from the fixed contact 2 is connected to a lower second toggle link 6 and a movable contact supporting member 5 forming one of the toggle links of the opening/closing mechanism. They are connected together by 7. The movable contact support member 5 is a frame 8
The movable contact 3 is rotatably supported by a shaft, and a stopper 10 is implanted on the tip side so as to correspond to a notch 3a provided on the contact side of the movable contact 3.

The fixed side arc horn 11, which is bent into a horizontal V shape so as to approach the fixed contact 2 of the fixed contact 1, is provided with a slit in the vertical direction, and is movable so as to be inserted into this slit I when the circuit is closed. A side arcing horn 12 is correspondingly provided. The thin plate-shaped movable arc horn 12 also serves as the movable contact support member 5, and is formed such that its tip protrudes toward the fixed arc horn 11 from the fixed and movable contacts 2.4.

In addition, a notch 13 is provided in the upper part of the fixed side arc horn 11.
An arc extinguishing device 14 is provided, which is configured to stack arc extinguishing plates 13 from a plurality of magnetic bodies having a distance from each other at intervals.

A connecting portion is provided at the tail end of the movable contactor 3, and one end of the flexible conductor 15 is connected to this connecting portion. This flexible conductor 15 is formed into a loop shape, and the other end is connected to one end of a connecting terminal 16 by a screw 17. The contact spring 18 that applies contact pressure to the movable contact 3 is divided into a relatively weak first spring 18a and a relatively strong second spring 18b. A torsion spring mounted so as to wrap around the rotation shaft 9, and one end of which is provided at the tail end of the movable contact 3, is attached to the pin 19.
Moreover, the other end is installed between the fixing member 20 and can be operated in either the open or closed position. Furthermore,
The second spring 18b is installed between the head of the pressing member 21 to the tail end of the movable contactor 3 and the base plate 100, and
1 is movably supported through the substrate 100, and under normal conditions, the pressing member 21 is pushed up to a predetermined position limited by the stopper pin 21a provided at the lower end by the acting force of the spring] and 8b. . This pressing member 2
1 acts on the movable contact 3 only in the contact direction from immediately before the movable contact 4 contacts the fixed contact 2.

An upper first toggle link 23 is connected to the upper end of the lower second toggle link 6 by a connecting shaft 22, forming a toggle link mechanism for opening and closing the movable contact 3.

As shown in Fig. 3, the first 1
The Heggle link 23 is rotatably supported by a support shaft 24 installed on a pair of frames 8.8 provided on both sides so as to sandwich it therebetween, and a guide arm 8a provided on the frame 8.8 (Fig. ) is fitted with a guide pin 25 that is integrally attached to the first toggle link 23. The cross spar 26 that interlocks various parts is installed integrally with the cross spar 26 (the j-shaped U-shaped arm 27 is connected to the first toggle link 23).
The extended end of the support shaft 24 is supported outside the frame 8.8 so as to have the same pivot point as the support shaft 24.

In addition, in order to operate the first toggle link 23, a guide pin 25 integrated with the first toggle link 23 is attached to one end of the arm 27 of the cross spar 26 by a long thread 2'7a extending radially from the support shaft 24. connected.

Further, as shown in FIG. 3, in the case of a three-pole electric switch, an opening/closing operation mechanism is provided for integrally opening and closing the contact devices of each type A, B, and C. In this opening/closing operation mechanism, an operating arm 30 is integrally attached to one end extension side of a crossbar 26 that connects the first toggle links 23 of each type A, B, and C. It is rotatably supported by a support shaft 32 on a pair of frames 8.8, which are arranged side by side on both sides of the contactor device, and frames 31.31, which are arranged side by side in the same way.

The support shaft 32 is supported on an axis connecting the cross par 26 and various support shafts 24 that serve as rotational fulcrums for the first toggle link 23, and various contact devices are opened and closed by rotation of the operating arm 30. be done. In this case, the support shaft 24.32 has eight support points by the frame 8.31, and when assembled, there will be slight positional deviation in each axis, resulting in smooth rotation of the three poles as one unit. Therefore, the rotatable support shaft 24.32 of the cross spar 26 is selected from among the support points of the eight frames 8.31, with frames 8.31 spaced apart from each other to the extent that rotation is not hindered. It is supported by

That is, in the illustrated embodiment, the bearing shafts 2 are oriented in one direction.
4.32 is supported at three points, the P points indicated by arrows. In the supporting part of the cross spar 26, the support shaft 24.32 is firmly and rotatably supported on the frame 8.31 as shown in FIG. 4A, and in other parts, the cross spar 26 is rotated as shown in FIG. 4B. Freely movable support shaft 24
is inserted into a play hole 27b provided in the arm 27 of the cross spar 26, which is larger in diameter than the shaft diameter of the support shaft 24, and is configured so that it is not substantially supported.

Further, in order to operate the first toggle link 23 between the three poles by rotating the cross par 26, an arm 27 is provided at each pole pairing position of the cross par 26, and a guide installed on the arm 27 and the first toggle link 23 is provided. The pin 25 is connected to the pin 25. If the connection is normal at this connection point, the first toggle link 23 of each girder and the support shaft 24 of the crossbar 26
1) - The guide pin provided on the glu link 23 because the three poles are not aligned due to component errors and slight differences and misalignment of the axes occur, resulting in "clogs" and [kinks]. 25 and the arm 27 of the cross bar 26 through a long groove hole 27a extending in the radial direction from the support shaft 24, so as to absorb dimensional errors occurring between each girder.

Effects of the Invention As described above, the present invention is rotated to open and close by a toggle link mechanism consisting of a fixed contact 1 provided for each pole and a pair of first and second toggle links 23.6. A movable contact device and a frame 8 that supports one end of the first toggle link 23 are arranged side by side on an insulating substrate 100 for multiple poles, and the movable contact device is rotated on the frame 8. a movable contact supporting member 5 rotatably supported by a rotating shaft 9; and a movable contact rotatably supported by a shaft 7 and having a movable contact 4 at one end and a connecting portion at the other end. 3, a flexible conductor 15 connected to the connection part of the movable contactor 3 and formed in a loop shape surrounding the rotating shaft 9 of the movable contactor device, and a contactor spring 18, A cross bar 2 common to each pole is provided concentrically with the toggle link 23 of
The desired purpose can be achieved by being configured to be operated to the open/close position by the rotation of 6.

In addition, the first toggle link 23 can be used without using the four-cylinder mechanism.
The crossbar 26, which has the same fulcrum as the electric switch, allows the toggle links of each girder to be directly operated to smoothly open and close the movable contact device, thereby further reducing the size of the electrical switch. In addition, according to the present invention, it is possible to obtain a multipolar electric switch which is small in size and has improved short-circuit current resistance.

[Brief explanation of the drawing]

Figures 1 to 4A and 4B show an embodiment of the multi-polar electric switch of the present invention, with Figure 1 showing the closed circuit state and Figure 2 showing the open circuit state, respectively. 3 is a plan view of the main part of the triode in a closed circuit state, FIG. 4A is a perspective view showing the state in which the crossbar is supported by the frame, and FIG. 4B is a perspective view showing the state in which the crossbar is not supported. , Figure 5 shows a conventional toggle link I! using a four-cylinder mechanism. FIG. 2 is a side sectional view of an electric switch with an ellipse. In the figure, 1: fixed contact, 2:
Fixed contact, 3: Movable contact, 4: Movable contact, 5: Movable contact support member, 6.23 Nidoguru link, 8.31: Frame, 11: Fixed side arc horn, 13: Arc extinguishing plate, 1
3a: Notch, 14: Arc extinguisher, 15: Flexible conductor, 1
6: Connection terminal, 18: Contact spring, 18a, 18b = Spring, 20: Fixing member, 21: Pressing member, 24.32: Support shaft, 25: Guide pin, 26: Cross bar, 27 = Arm, 27a: Long groove Hole, 30: Operation arm. Patent Applicant Terasaki Electric Industry Co., Ltd. Same as above Agent Patent Attorney Dosho Sowa Proceedings Amendment 6゜Contents of Amendment October 31, 1985 (1) Changed ``between tying'' on page 6, line 6 of the specification to ``tying'' line J

Claims (2)

[Claims] (1) A fixed contact for each pole, a movable contact device that is rotated to open and close by a toggle link mechanism consisting of a pair of first and second toggle links, and one end of the first toggle link. A movable contact support member in which a supporting frame is disposed horizontally on an insulating substrate for multiple poles, and the movable contact device is rotatably supported on the frame; a movable contact rotatably supported and having a contact portion at one end and a connection portion at the other end; the first toggle link is operated into an open/close position by rotation of a crossbar common to each pole that rotates concentrically with the first toggle link; A multi-pole electrical switch characterized by: (2) The crossbar is supported by a plurality of frames selected from a frame group consisting of a frame of a multi-pole contact device and a frame of an opening/closing operation mechanism arranged side by side with the contact device, and A crossbar and a first toggle link of each pole are substantially concentric, the crossbar is provided with an arm at a position for each pole, and at least one of the arm and the first toggle link has a radius. The multipolar electric switch according to claim 1, wherein the multipolar electric switch is connected by a pin or a protrusion inserted into a long slot that is movable in a direction.