Matsushita Electric Works, Ltd.

Yoichi Yokoyama

Hideya Kondo

Nobuhiro Kitamura

Naoki Kanemoto

Tetsuyasu Kawamoto

Kiwamu Shibata

Hiroaki Hamaguchi

Riichi Uotome

Takehiko Toguchi

Mamoru Tateno

Yoichi Kunimoto

Kiyoshi Goto

Masahiro Kutsuna

Masatoshi Yamamoto

Shigeru Honoki

Takatoshi Hongyou

Hirofumi Fukazawa

Manabu Yano

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.

Plural sealed contact units with common electromagnetic operating

A damper is provided by a plurality of chambers defined between stacked thin sheet members and containing a fluid for flowing therein through a communicating section, the chambers being made to be of a small height in the direction perpendicular to the plane of the sheet members and to form a buffer section with at least one of the chambers. With such damper employed in electromagnet assemblies and eventually relays including the assemblies, they can be sufficiently minimized in size, and their manufacture can be also made extremely easier.

Damper, electromagnet assembly employing the damper, and relay employing

An electromagnetic relay includes a pair of contacts of high fusion-bonding resistance and a further pair of contacts of low contact resistance, which pairs being connected mutually in parallel relationship, with an actuator of an electromagnet unit interposed between them and respectively having a movable contactor carrying a movable contact of the pair and provided for contact opening and closing with respect to a stationary contact of the pair by means of the actuator of the electromagnet unit, whereby the pair of contacts of low contact resistance can be prevented from causing any fusion-bonding and any temperature rise around the pair can be effectively restrained.

Electromagnetic relay

A contact device is provided with an additional mass member secured to a movable contactor carrying a movable contact capable of opening and closing contacts with a stationary contact, for providing to the movable contactor a mass acting in a direction perpendicular to longitudinal axis of the contactor. A rolling motion is thereby caused to occur in the movable contactor upon contact closing motion so that the movable contact can be prevented from being fusion-bonded to the stationary contact.

Welding free relay contact device

A circuit breaker includes an arc shearing plate which is driven to thrust between a pair of contacts being separated so as to shear an arc formed therebetween for rapid arc extinction. Included in the circuit breaker is an over-current responsive actuating member which applies an impact to one of the contacts for rapid contact separation in response to a predetermined over-current condition such as caused by a short-circuit. The actuating member is also coupled to the arc shearing plate so as to control the thrusting movement of the arc shearing plate in synchronism with the rapid contact separation, whereby the timing of inserting the plate between the contacts can be easily controlled with respect to that of separating the contacts for achieving rapid arc extinction and providing a high arc voltage and current limiting action.

Current limiting circuit breaker with an arc shearing plate

A remotely controllable relay comprises a rocker pivoted at an intermediate point for rocking at one end in normal or reverse direction in response to forward or backward motion of a movable member of an electromagnet means, and a movable contactor linked to the rocker for contacting with or separating from a fixed contactor in response to the rocking of the rocker. A larger momentum at the other end remote from the pivoted point of the rocker achieved with a smaller momentum of the movable member is utilized to sufficiently separate the movable contactor from the fixed contactor upon contact opening, the smaller momentum movable member allowing the electromagnet means to be minimized in size for a miniaturization of the relay and consumed power saving.

Remotely controllable relay

An improved remotely controllable circuit breaker comprises a manually operable switching mechanism for opening and closing a single set of first and second contacts, a trip mechanism for opening the contacts upon occurrence of predetermined overload current conditions, and a remotely controllable switching mechanism for selectively opening and closing the contacts in response to a control signal remote from the breaker. The manually operable switching mechanism includes a movable contact arm carrying the first contact to be brought into and out of contacting engagement with the second contact by manipulation of a manual handle. The second contact is operatively connected to the remotely controllable switching mechanism to be driven thereby for movement between an operative position where the second contact is engageable with the first contact and an inoperative position where it is prohibited from being engaged with the first contact independently of the position of the first contact. Accordingly, the remotely controllable mechanism can be entirely isolated from the manually operable switching mechanism when the former is responsive to the remote control signal for bringing the second contact into its inoperative position.

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Kadoma, Japan

Yoichi Yokoyama