CONTACT DEVICE AND ELECTROMAGNETIC RELAY EQUIPPED WITH THE CONTACT DEVICE

• US 20150194284A1
• Filed: 07/01/2013
• Published: 07/09/2015
• Est. Priority Date: 07/06/2012
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Enomoto, Hideki, Uruma, Katsuya, Ikeda, Yohji
• Granted Patent: US 9,881,758 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01H 1/06 characterised by the shape or structure of the contact-making surface, e.g. grooved
• CPC Class Codes: H01H 1/2083 Bridging contact surfaces directed at an oblique angle with respect to the movement of the bridge
• CPC Class Codes: H01H 2050/025 containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction
• CPC Class Codes: H01H 2201/022 Material
• CPC Class Codes: H01H 50/546 for contactors having bridging contacts
• CPC Class Codes: H01H 50/64 Driving arrangements between movable part of magnetic circuit and contact structurally associated with contact spring sets H01H50/58
• CPC Class Codes: H01H 9/443 using permanent magnets

Abstract

A contact device includes: a contact block including a plurality of fixed terminals on which fixed contacts are formed, and a movable contactor on which movable contacts contacting and leaving the fixed contacts are formed; and a driving block that drives the movable contactor. Moreover, it is made possible to extinguish arcs, which are generated in an event where the contacts contact and leave each other, by arranging permanent magnets on a periphery of the contact block. Then, at least one fixed terminal among the plurality of fixed terminals is formed so that the fixed contact and the movable contact can abut against each other in a region other than a side opposite to the other fixed terminal.

Claims

1. A contact device comprising:

a contact block including a plurality of fixed terminals on which fixed contacts are formed, and a movable contactor on which movable contacts contacting and leaving the fixed contacts are formed;

a driving block that drives the movable contactor so that the movable contacts can contact and leave the fixed contacts; and

a magnetic field forming unit that is arranged on a periphery of the contact block and forms a magnetic field,

wherein, the fixed contact of at least one fixed terminal among the plurality of fixed terminals abuts against the movable contact in a region other than a side opposite to other fixed terminal.

2. The contact device according to claim 1, wherein the magnetic field forming unit includes a pair of permanent magnets arranged opposite to each other through the contact block in a direction perpendicular to a contacting/leaving direction of the movable contacts and the fixed contacts, and polarities of surfaces of the pair of permanent magnets, the surfaces being opposite to each other, are same.

3. The contact device according to claim 1, wherein a magnetic material is provided on the movable contactor.

4. The contact device according to claim 1, wherein the fixed contact of the one fixed terminal is allowed to abut against the movable contact in the region other than the side opposite to the other fixed terminal by forming a step difference portion on at least one side of a fixed terminal side and a movable contactor side.

5. The contact device according to claim 4, wherein the step difference portion is formed on the movable contactor side.

6. The contact device according to claim 5,

wherein the movable contactor is driven by a driving shaft of the driving block, and

the step difference portion is formed to have a circular arc shape taking the driving shaft of the movable contactor as a substantial center when viewed from the above.

7. The contact device according to claim 4, wherein the step difference portion is formed on the fixed contact side.

8. The contact device according to claim 7, wherein the step difference portion is formed over an entire circumference of the fixed terminal side.

9. The contact device according to claim 4, wherein the step difference portion is formed so that a step difference surface that couples step differences to each other can extend in the contacting/leaving direction of the movable contacts and the fixed contacts.

10. An electromagnetic relay, wherein the electromagnetic relay is equipped with the contact device according to claim 1.