Direct current load breaking contact point constitution and switching mechanism therewith

• US 6,934,134 B2
• Filed: 03/03/2003
• Issued: 08/23/2005
• Est. Priority Date: 03/11/2002
• Status: Expired due to Fees

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Mori, Tetsuya, Funaki, Kenji, Takahashi, Yasusuke, Maenishi, Kozo
• Primary Examiner(s): Jackson, Stephen W.
• Application Number:
  US10/378,363
• Publication Number:
  US 20030184928A1
• Time in Patent Office: 904 Days
• Field of Search: 200/262, 200/266, 200/263, 361/2, 361/58, 361/6, 361/115
• US Class Current: 361/2
• CPC Class Codes: B22F 2207/20 Cooperating components
• CPC Class Codes: B22F 2998/00 Supplementary information concerning processes or compositions relating to powder metallurgy
• CPC Class Codes: C22C 32/0021 Matrix based on noble metals, Cu or alloys thereof
• CPC Class Codes: H01H 1/02372 containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te
• CPC Class Codes: H01H 1/02376 containing as major component SnO2
• CPC Class Codes: H01H 1/04 Co-operating contacts of different material

Abstract

The invention intends to provide a direct current load breaking contact point constitution that can make and break an electrical circuit under both direct current loads of direct current resistance load and direct current inductance load over a long period of time without causing problems such as {circle around (1)} the conduction defect due to the consumption of the contact point, {circle around (2)} the locking due to material transfer from one contact point to the other contact point, {circle around (3)} the welding between the contact points, and {circle around (4)} the abnormal arc continuation, and a direct current load breaking switching mechanism such as a relay, a switch and so on that has the contact point constitution. The direct current load breaking contact point constitution according to the invention comprises a movable contact point and a stationary contact point that face each other; wherein the movable contact point is made of AgSnO₂In₂O₃ alloy that contains at least Ag, 8 to 15% by weight in total of metal oxides including SnO₂ and In₂O₃, 6 to 10% by weight of SnO₂ and 1 to 5% by weight of In₂O₃; the stationary contact point is made of AgZnO alloy that contains at least Ag and 7 to 11% by weight of ZnO; and polarity of a movable side is (+) and that of a stationary side is (−).

Claims

1. A direct current load breaking contact point constitution, comprising:

a movable contact point and a stationary contact point that face each other;

wherein the movable contact point is made of AgSnO₂In₂O₃ alloy that contains at least Ag, 8 to 15% by weight in total of metal oxides including SnO₂ and In₂O₃, 6 to 10% by weight of SnO₂ and 1 to 5% by weight of In₂O₃;

the stationary contact point is made of AgZnO alloy that contains at least Ag and 7 to 11% by weight of ZnO; and

polarity of a movable side is (+) and that of a stationary side is (−

).

2. A direct current load breaking switching mechanism, comprising:

a contact point constitution set forth in claim 1.

3. A relay, comprising:

a contact point constitution set forth in claim 1.

4. A switch, comprising:

a contact point constitution set forth in claim 1.