JPS6350807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch contact mechanism used in a load switch such as a remote control switch device.

Remote control switch devices have been widely used recently because they can open and close power loads such as lighting equipment from various locations from a distance.
Its purpose is to switch on and off loads that are below the normal rating, and it cannot cut off overload currents or short-circuit currents. Therefore, overload currents and short-circuit currents are cut off by circuits or disconnectors such as distribution board breakers connected in series with this switch device. Therefore, when a large current flows through such a circuit, the remote control switch device will not allow the contacts attached to the contacts to weld or melt until the circuit breaker or breaker cuts off the current. It is required that the power continues to be applied without any interruption.

An example of a contact mechanism of a load switch used in a remote control switch device is shown in FIG. In FIG. 1, the contact mechanism is attached to a terminal plate 2 drawn in from the outside through a case 1, and supported by a fixed contact 4 having a fixed contact 5 and another terminal plate 3 drawn in from the outside. A movable contact 7 rotates around the terminal plate 3 as a fulcrum and has a movable contact 6 facing the fixed contact 5, and a spring 8 that reverses the movable contact 7 and applies contact pressure to the contacts 5 and 6. It is equipped with The movable contactor 7 is connected to the terminal plate 3 by a flexible conductor 12. 9 is a terminal screw.

When an operating force in the P direction is applied to the protrusion 7a of the movable contact 7 by an electromagnet (not shown), the movable contact 7 performs a reverse operation, and the movable contact 6 moves toward the fixed contact 5.
It connects and separates to open and close the load.

The contact mechanism of a switch used in such a remote control switch device is designed to reduce the strength of the spring and reduce the contact pressure of the contact in order to reduce the operating energy and extend the service life.
Generally, when an accident such as a short circuit occurs on the load side of a switch and a large current flows, the contacts of the switch open due to electromagnetic repulsion caused by the large current. Therefore, in the conventional contactor mechanism as described above, when a short circuit current flows through the contacts, the contact contacts are removed before the circuit breaker or breaker connected in series with the remote control switch device interrupts the short circuit current. The pressure becomes even lower and sometimes they open up. If the contact pressure is low, the contact resistance will be high, and the contacts may overheat and weld. Furthermore, if the contact opens, there is a risk that the contact will melt due to arcing and become unusable because it does not have the ability to cut off a large current such as a short circuit current.

In order to eliminate such drawbacks, the following proposals have also been made. That is, a U-shaped fixed iron piece 10 and an L-shaped movable iron piece 11 as shown in FIG. 3 are attached to the conventional contactor mechanism shown in FIG. 1, and the fixed iron piece 10 as shown in FIG. The iron piece 10 is
The leg 10a is attached to the fixed contact 4 so as to sandwich the fixed contact 4 with the leg 10a facing the movable contact 7. Of course, the fixed iron piece 10 may be attached to the terminal plate 2. One side 11a of the L-shaped movable iron piece 11 faces the end face of the U-shaped leg 10a of the fixed iron piece 10, and when both contacts 5 and 6 are closed, the surface of the movable iron piece 11 faces the end face of the U-shaped leg 10a of the fixed iron piece 10. L-shaped leg 1 (configuration shown in Figure 3) so as to maintain a slight gap from the end face.
1b to the movable contact 7.

The constant operation of this contactor mechanism is exactly the same as that of conventional ones, so the explanation will be omitted. However, if an accident such as a short circuit occurs in the load to which the contactor mechanism of this switch is connected, the fixed contact 5 and movable contact 6
When a large current flows between the contacts 5 and 6, a force tends to separate them from each other due to the electromagnetic force of the current flowing through the contacts 4 and 7, but the fixed iron piece 10 and the movable iron piece 11 Since the iron pieces 10 and 11 act in a direction in which they are magnetized and attracted to each other, the contacts 5 and 6 are pressed against each other via the fixed contact 4 and the movable contact 7 to which the iron pieces 10 and 11 are attached, respectively. Therefore, the contact pressure between the contacts 5 and 6 increases, and phenomena such as an increase in the contact resistance between the contacts 5 and 6 or an arc caused by the contacts 5 and 6 opening do not occur. During this time, the circuit breaker and disconnector cut off the large current, so there is no risk of welding or melting of the fixed contact 5 and the movable contact 6.

However, attaching the iron piece to the movable contact in this manner increases the number of parts, requires more man-hours to secure the movable contact and the iron piece by spot welding, etc., and increases equipment costs. Furthermore, since the weight of the movable contact increases by the amount that the iron piece is attached, there is a disadvantage that the structure of the movable part must be changed and the driving energy also increases.

The present invention eliminates the above-mentioned drawbacks, and the contact pressure of the contacts does not decrease even when a large current such as a short circuit current flows.
It is an object of the present invention to provide a contact mechanism for a switch which is simple and inexpensive, and whose switching characteristics do not change.

This purpose consists of a fixed contactor with fixed contacts,
An opening/closing device comprising a movable contact having a movable contact and a lead wire connected to the movable contact to make the movable contact contact and separate from the fixed contact, and the movable contact being mechanically held in the closed or open state of both the contacts. In the contact mechanism of the device, the movable contact is formed of an iron plate, the lead wire is directly connected to the movable contact, and a U-shaped fixed iron piece connects the end face of the U-shaped leg to the movable contact side. This is accomplished by mounting the U-shaped leg so that the end face of the U-shaped leg faces the movable contact with a slight gap between them when the fixed contact is in the closed state.

Next, embodiments of the present invention will be described in detail based on the drawings. In Fig. 4, the fixed contact 4 of the switch
1 or 2, it has a fixed contact 5 which is attached to a terminal plate 2 which is drawn in from the outside through a case 1. Further, a U-shaped fixed iron piece 10 as shown in FIG.
It is attached with the end face of 0a facing the movable contactor 7 side. As shown in FIG. 5, the movable contact 7 is formed of a single piece of iron, and the movable contact 6 is attached by caulking, and a wide part 7a corresponding to the fixed iron piece 10 is further provided in a part of its longitudinal direction. It is provided. This movable contact 7 is supported by another terminal plate 3 pulled in from the outside so as to face the fixed contact 4, and is reversely operated by a spring 8 to bring the fixed contact 5 and the movable contact 6 into and out of contact, thereby reducing the load. Open and close. When the fixed contact 5 and the movable contact 6 come into contact, the fixed iron piece 10
The end face of the movable contact 7 is designed to maintain a slight gap from the wide part 7a of the movable contact 7. The movable contact 6 is attached to the movable contact 7 by caulking, and the caulked portion protrudes from the back surface of the movable contact 7 as a projection 6a. One end of the flexible conductor 12 is connected to this projection 6a, and the other end is connected to the terminal plate 3.

The regular opening/closing operation of this contactor mechanism is the same as that shown in Fig. 1 or 2, and the suction operation between the fixed iron piece and the wide part of the movable contactor due to large current is also the same as that shown in Fig. 2. Since this is the same as the suction operation with the movable iron piece, the explanation will be omitted, but since the movable contact in this contactor mechanism is formed of an iron plate, the electrical resistance is high. However, with this movable contact, the movable contact and the terminal board are directly connected by a flexible conductor, so there is no problem with current flow, and the material cost is low because the copper or copper alloy movable contact replaces the iron plate. Become. Furthermore, since the weight of the wide portion increases only slightly, it is lighter than a movable contact made of copper or copper alloy with an iron piece attached, and opening/closing operations can be performed easily. Furthermore, there is no need for work to attach a piece of iron to the movable contactor, and no equipment is required, making both structural work simple and inexpensive.

As described above, the present invention has a fixed iron piece attached to the fixed contact side of a switch used in a remote control switch device, etc., and a movable contact made of an iron plate with a wide part facing the fixed iron piece. This is a contact mechanism in which a flexible conductor is connected directly to a movable contact that is fixed by caulking to the contact, and when a large current flows between these two contacts, the wide part of the fixed iron piece and the movable contact Since the two contacts attract each other with a force stronger than the electromagnetic repulsion caused by a large current, the contact resistance between the two contacts will not increase or they will open, and the life of the contacts will be long. In addition, the movable contact is constructed from a single plate, which eliminates the troublesome work and increase in weight that would occur when attaching a piece of iron to a conventional movable contact, making it inexpensive, simple, and excellent.

[Brief explanation of the drawing]

Figures 1 and 2 each show the contactor mechanism of a conventional switch, where A is a front view and B is a front view.
3 is an enlarged perspective view showing the configuration of both iron pieces and a movable contact used in the contactor mechanism of FIG. 2, and FIG. 4 shows the contactor mechanism of a switch according to the present invention.
A is a front view, B is a side view of A, and FIG. 5 is an enlarged perspective view of the fixed iron piece and movable contact used in FIG. 4. 4... Fixed contact, 5... Fixed contact, 6... Movable contact, 7... Movable contact, 10... Fixed iron piece,
10a... U-shaped leg of fixed iron piece, 12... Lead wire.

Claims (1)

[Claims] 1. A fixed contact having a fixed contact, and a movable contact having a movable contact to which a lead wire is connected and which makes the movable contact contact and separate from the fixed contact, and this movable contact closes or separates both the contacts. In a contact mechanism of a switch that is mechanically held in an open state, the movable contact is formed of an iron plate, the lead wire is directly connected to the movable contact, and a U-shaped fixed iron piece is connected to the U-shaped fixed iron piece. The end face of the U-shaped leg faces the movable contact and holds the fixed contact so that when both the contacts are in a closed state, the end face of the U-shaped leg faces the movable contact with a slight gap. A contactor mechanism of a switch, characterized in that it is attached.