Matsushita Electric Works, Ltd.

Panasonic Electric Works Co., Ltd.

Riichi Uotome

Ritsu Yamamoto

Takehiko Toguchi

Hideki Enomoto

Masahiro Ito

Narutoshi Hoshino

Katsuya Uruma

Takaaki Chuzawa

Motoharu Kubo

Mamoru Tateno

Kiyoshi Goto

Kouji Yokoyama

Hideki Kishi

Tsutomu Shimomura

Toshiyuki Suzuki

Hideya Kondo

Yoichi Yokoyama

Yoshiyuki Iwami

Masahiro Itou

Katsuyoshi Kamioka

Hirofumi Fukazawa

This electromagnetic switching device comprises an electromagnetic devicein which a movable corecomes into contact with or separates from a fixed corein response to energization of an excitation coilwound around a coil bobbina contact devicewith a fixed contactand a movable contact which comes into contact with or separates from the fixed contact in conjunction with a movement of the movable coreof the electromagnetic device, and a boxy caseconfigured to house the electromagnetic device and the contact device. The coil bobbinhas a flangeat its end in an axis direction of the coil bobbin, and the casehas, on its inner surface, a recessinto which a periphery of the flangeof the coil bobbin is fitted, and a cushioning memberfor absorbing an impact which is transmitted from the electromagnetic device to the case is disposed in the recess, and the flange of the coil bobbin is supported by the recess through the cushioning member whereby the electromagnetic device is supported in the case.

Electromagnetic switching device

A contact device including a pair of fixed terminalswith a fixed contacteach, a movable armaturewith movable contactswhich contact to or separate from the fixed contacts, a movable shaftconnected to the movable armatureat its one end, a movable coresecured to the opposite endside of the movable shaft, a movable core receiverslid onto the movable shaftso that it faces a surfaceon the movable armature side of the movable coreto receive the movable coredriven by an electromagnetic mechanism, an impact absorberdisposed on a surfaceon the movable armature side of the movable core receiverto absorb an impact generated when the movable corehit the movable core receiver, and a stopper(a movement restriction member) disposed on a surface on the movable armature side of the impact absorberto restrict a movement of the impact absorber

Contact device

In the electromagnetic switching device, it is possible to miniaturize and have low costs, have quiet operation noise, and also quickly extinguish the arc. The electromagnetic switching device has an electromagnetic actuator with a movable iron core, a pair of fixed terminals that respectively have a fixed contact point, a movable contact that has movable contact points on the right and left ends, a shaft, and an enclosing component that holds the movable contact points and the fixed contact points. The pair of movable contact points respectively contact with and detach from the pair of fixed contact points, and the pair of fixed contact points respectively conduct each other and are insulated again through the shaft by moving the movable iron core along the axis using the electric magnetic actuator. A quasi-hermetically sealed space, which is the extinguishing space, is formed by the enclosing component and a first yoke. A potting compound is charged, into the space between a body and the quasi hermitically sealed space.

A shunt resistor of the present invention has a configuration including a substantially planar resistor () having a predetermined resistance value; a first fixed terminal plate () that has one end portion () connected to an edge of the resistor (); and a second fixed terminal plate () that has one end portion () connected to the other edge of the resistor (), that has a portion in the vicinity of the end portion () which is bent substantially in the shape of the letter 'U', and that opposes at least a portion of the first fixed terminal plate (), wherein a plurality of terminal tabs () for taking a voltage drop in the resistor () as a voltage signal is provided protrusive from a side edge of the resistor (), and lead wires () are connected to the terminal tabs (). This configuration eliminates a conventional structural restriction requiring portions in the direction of to the sidewall of the resistorto be open, and consequently, enables the degree of freedom in design to be enhanced.

Shunt resistance and method of adjusting the shunt resistance

Each movable contactis given a first force by a drive mechanism along a direction for bringing the movable contact into contact with a fixed contactand given a second force through a legby deformation of a supporting memberresulted from an overtravel of the movable plate. The fixed contact and the movable contact are arranged such that a resultant force of the first and the second forces acts in a direction normal to a contact surface defined between the fixed contacts and the movable contacts. So, a component force of the resultant force parallel to the contact surface is not generated, therefore, a side slip of the movable contact can be prevented when the contacts are opened or closed.

In an electromagnetic switching device including a cylindrical part made of a magnetic material with a closed bottom for housing a movable iron core having a movable contact and so constructed as to render the movable contact movable toward and away from a fixed contact, a joint member made of a metallic material with an insertion hole formed substantially in the center thereof for movably receiving a movable shaft fixedly attached to the movable iron core, and a metal plate made of a non-magnetic material with a hole formed substantially in the center thereof with the inner diameter substantially the same as the inner diameter of the cylindrical part, the cylindrical part and the joint member are air-tightly jointed to each other with the metal plate provided therebetween, and the movable iron core is housed in the cylindrical part with a clearance defined between the movable iron core and the joint member corresponding to a required stroke within which the movable contact contacts the fixed contact. This arrangement provides improvement in magnetic efficiency of electromagnet of the device. Accordingly, improved energy saving performance is accomplished as compared with a case of a conventional electromagnetic switching device.

Electromagnetic switching apparatus

A contact apparatus is provided having a permanent magnet disposed in a region where a fixing contact point is mounted to a fixing contact and a movable contact to which a movable contact point is mounted. An arc generated between both the contact points is moved in a lateral direction by the magnetic force of the permanent magnet and stretched. An arc-extinguishing member which is heated by the arc for generating arc-extinguishing gas is provided such as to surround the fixing contact point and the movable contact point.

Contactor

A single-pole relay switch capable of effective arc extinction irrespective of the current flowing directions in which the device is connected in a circuit. The switch has a housing and two sets of contacts located in the housing, each set being composed of a fixed contact and a movable contact. A contact carrier is provided to have first and second movable arms which extend commonly from a bridge and are provided respectively with the two movable contacts. An actuator applies a driving force to move the contact carrier between an ON-position of holding the movable contacts simultaneously in contact respectively with the fixed contacts, and an OFF-position of keeping the movable contacts at respective opening gaps from the fixed contacts. The housing includes a casing which is divided into first and second chambers respectively for receiving the contact sets, each of the first and second chambers being surrounded by a dielectric wall. Permanent magnet are disposed around the casing to stretch the individual arcs in opposing directions to each other and towards the dielectric walls of the first and second chambers, respectively. Thus, the individual arcs can be stretched individually within the separate chambers, i.e., in an isolated condition. Therefore, the individual arcs can be free from merging even when the current flows in such a direction as to drive the arcs in the approaching direction.

Single pole relay switch

A sealed switch has a vessel defining therein a hermetically sealed space which receives a pair of fixed contacts and a movable contact bridging the fixed contact. The movable contact is movable between an ON-position of closing with the fixed contact and an OFF-position of separating from the fixed contacts. Hydrogen gas or hydrogen rich gas is filled in the sealed space in order to suppress arc development between the movable and fixed contacts. The plunger carries at its axial one end the movable contact and carrying at the other axial end an actuator which moves the plunger axially for movement of the movable contact from the OFF-position to the ON-position. An over-travel spring is provided to give a bias for moving the movable contact relative to the plunger in order to develop a contacting pressure between the movable and fixed contacts. The over-travel spring is supported to a spring holder secured to the plunger. The plunger is formed with a threaded portion which extends through the actuator to allow the plunger to move axially relative to the actuator for adjustment of a contact gap between the movable and fixed contact, and the spring holder is formed with stopper protrusions which project in abuttable and slidable relation to the interior surface of the vessel such that the movable contact is prevented from rotating together with the plunger. Accordingly, the spring holder is best utilized to restrict the movable contact from rotating together with the actuator to enable an easy adjustment of the contact gap simply by rotating the actuator.

Sealed contact device with contact gap adjustment capability

A sealed contact device includes a sealed contact section having a sealed container defining therein a gas-tight space together with a bellows for housing therein electrodes and sealing therein a gas preferably consisting mainly of hydrogen, the electrodes including fixed electrodes and movable electrodes engageable with and separable from the fixed electrodes, a contact pressure spring biasing the movable electrodes in engaging direction with respect to the fixed electrodes, a resetting spring biasing the movable electrodes in separating direction from the fixed electrodes, and a movable shaft projected at an end out of the sealed container and coupled at the other end to the movable electrodes; a driving member providing at a movable part a drive force for driving the movable shaft in the direction of engaging the electrodes; and a relaying member interposed between the movable shaft of the sealed contact section and the movable part of the driving member and having a regulating element for regulating driving position of the movable shaft, the relaying member being coupled to the movable part and including a coupling element coupled through the regulating element to the movable shaft.

Sealed contact device and operating mechanism

A sealed contact unit that attains stabilized contact switching operation and effective dimensional minimization with an arrangement wherein a switching contact section including opposing movable and stationary contacting members is housed within a sealed container together with an electrically insulating gas, a movable shaft interlocked to the movable contacting member is hermetically passed through a wall of the container to be axially shiftable with an end projected externally while the movable contacting member biased away from the stationary contacting member by a resetting spring is mounted through a contact-pressure spring to the other end of the movable shaft inside the container, the contact-pressure spring being provided to coaxially enclose the movable shaft and biasing the movable contacting member against the biasing force of the resetting spring for attaining a contact-pressure when the movable contact member shifts to engage the stationary contact member fixed inside the container, a driving section for switching ON and OFF between movable and stationary contacts of the movable and stationary contacting members is engaged to the projected end of the movable shaft for axial drive of the shaft.

Growing community of inventors

Katano, Japan

Riichi Uotome