Mitsubishi Denki Kabushiki Kaisha

Masahiro Kakizoe

Teijiro Mori

Shigeru Masuda

Shizutaka Nishizako

Yuji Sako

Yuichi Wada

Hiroyuki Okado

Tatsuya Hayashi

Shigeharu Ootsuka

Yuji Mizuno

Shigeharu Otsuka

Shigeharu Ohtsuka

A switch which is superior in current limiting performance. The switch comprises a movable contact element having a pair of movable contacts secured thereto, a pair of fixed contacts individually secured to fixed contact elements for individually contacting with the movable contacts, an electromagnetic driving device including a movable iron core, and a first operating rod secured to the movable iron core. An electromagnet is disposed alongside the electromagnetic driving device and includes a movable iron core, and movement of the movable iron core of the electromagnet is transmitted to the movable contact element by way of a transmitting member and a second operating rod. The first and second operating rods are disposed for movement along a common axial line, and movement of the movable iron core of the electromagnetic driving device is transmitted from the first operating rod to the movable contact element either directly or by way of the second operating rod.

Switch

An electromagnetic apparatus has a connecting mechanism which transmits the operation of an actuator (28) of a main body to electric contact parts (13, 14) of a time delay unit 34 mounted on the main body. The connecting mechanism comprises a movable frame (31, 41, 51) for making the open/close operation of the electric contact parts (13, 14), and a connecting bar (30,60, 70) for connecting between the actuator (28) and the movable frame (31, 41, 51). The connecting bar (30, 60, 70) detachably engages with the actuator (28) and is connected to the movable frame (31, 41, 51) through a spring (32) which adjusts difference of operation stroke when the actuator (28) is moved over the operation stroke of the movable frame (31, 41, 51).

Electromagnetic apparatus

Electromagnetic contactor

Power switch

An electromagnetic contactor having an electromagnet consisting of a fixed core and an operating coil mounted on the fixed core, a plurality of fixed contacts, a crossbar disposed above the fixed core, a plurality of contact bars associated with the crossbar and each provided with a pair of movable contacts located opposite the corresponding fixed contacts, respectively, a movable core joined to the lower portion of the crossbar opposite to the fixed core, and a rigid frame consisting of two parallel polygonal bars and two parallel connecting bars interconnecting the respective opposite ends of the polygonal bars. The crossbar and the movable core are supported pivotally on the rigid frame. One of the polygonal bars is supported rotatably at the opposite ends thereof in bearings provided on a stand, while the other polygonal bar is urged upward by springs so that the rigid frame will swing to bring the movable contacts into contact with the fixed contacts, respectively, when the operating coil is energized to attract the movable core to the fixed core.

An electromagnetic contactor in which at least one pair of contacts which disengage from each other to interrupt a current are provided in an arc-extinguishing chamber defined by a partition wall of electrically insulating material. An absorbing member of porous metal is provided on the inner surface of the partition wall to absorb molten metal particles which are formed by arcing at the time of disengagement of the contacts. A shield plate of electrically insulating material is provided on the inner surface of the absorbing member, and through-holes are formed in the partition wall of the arc-extinguishing chamber and the shield plates in such a manner that the through-holes of the partition wall are non coincident in position with those of the shield plate so that the absorbing member is protected from damage.

An electromagnetic contactor in which an arc extinguishing chamber is defined by an insulating base and a box attached removably to the insulating base. In the arc extinguish chamber, there are accommodated fixed contact elements having fixed contacts, a movable contact element having a movable contact adapted to be brought into and out of contact with the fixed contacts of the fixed contact elements, a commutation electrode for receiving arcs established when the movable contact comes out of contact with the fixed contacts, arc extinguish metal plates for extinguishing arcs commutated to the commutation electrode, and an extinguishing plate support for supporting the arc extinguishing plates. The extinguishing plate support is formed with a groove or hole for receiving the end portion of the commutation plate so that it is held on the commutation electrode. By elastically clamping the commutation electrode between the inner wall faces of the box defining the arc extinguishing chamber, the extinguishing plate support is held in the arc extinguishing chamber by the commutation electrode.

The disclosed electromagnetic contactor has a base including a lateral opening and an internal space, and two rails disposed at the bottom of the internal space. A U-shaped stationary iron core including two guides on both sides is assembled into a coil holder so that one leg of the 'U' is surrounded by an operating coil held by the coil holder. Then the coil holder is inserted into the internal space in the base through the lateral opening with the guides engaging the rails until it is removably positioned in the internal space.

A power switching device including a fixed contact, a movable contact, an arc runner for transferring a leg of an electric arc to the outside of the fixed contact, a U-shaped fixed contactor electrically connected to the fixed contact, and a deionizing grid for extinguishing the arc. The side of the fixed contact is opposed to the side of the arc runner in three directions. At least the portion of the arc runner close to the fixed contact is kept away from the fixed contact and is physically separated therefrom by an electrically insulating medium. The arc runner is fixed and connected to a portion of the fixed contactor which is on the opposite side of the deionizing grid with respect to the fixed contact. Further, the runner extends so that it forms a continuous path along which the arc runs. Accordingly, after the arc has been transferred to the runner, it is urged toward the deionizing grid, thereby assuring continuous and smooth movement of the arc. Thus, a situation in which the arc is moved away from the grid resulting in incomplete extinction of the arc is prevented.

Power switching device

A power switchgear is equipped with a stationary contact and contact-maker, a movable contact and contact-maker, a commutating electrode and an arc runner. The elements are constructed and arranged such that when the contacts open, the resultant arc will be quickly driven from the contacts to the commutating electrode and arc runner, to increase the life of the contacts and shorten the arcing time.

Growing community of inventors

Nagoya, Japan

Masahiro Kakizoe