Repulsion type circuit breaker control device

Abstract

A repulsion type circuit breaker movable contact device comprising a first movable contact, an opening/closing mechanism which drives the first movable contact for opening and closing, a second movable contact for contacting the first movable contact, the second movable contact being freely pivotable and adapted to receive an electromagnetic repulsion force from said first movable contact, and a contact spring comprising a twisted coil spring disposed with its twisting fulcrum displaced from the rotational pivot of the second movable contact, the contact spring urging the second movable contact into contact with the first movable contact, whereby upon flow of a predetermined mount of electric current through the first and second movable contacts, the electromagnetic repulsion force moves the second movable contact apart from the first movable contact.

What is claimed is: 
     
       1. A repulsion type circuit breaker movable contact device comprising: a first movable contact;   an opening/closing mechanism operably attached to said first movable contact for driving said first movable contact between an open and a closed position;   a second movable contact for contacting said first movable contact when said first movable contact is in said closed position, said second movable contact being freely pivotable and adapted to receive an electromagnetic repulsion force from said first movable contact; and   a twisted torsional coil contact spring disposed with its .[.twisting fulcrum.]. .Iadd.point of application for twisting .Iaddend.displaced from the rotational pivot of said second movable contact, said contact spring urging said second movable contact into contact with said first movable contact, whereby upon flow of a predetermined amount of electric current through said first and second movable contacts, the electromagnetic repulsion force moves said second movable contact apart from said first movable contact.   
     
     
       2. A repulsion type circuit breaker movable contact device as in claim 1, wherein a pin is disposed in said second movable contact and an arm of said contact spring is engaged with said pin. 
     
     
       3. A repulsion type circuit breaker movable contact device as in claim 1, wherein a pin is disposed in said second movable contact and said contact spring includes a U-shaped portion, two arms and a coil disposed between said U-shaped portion and each of said arms, each of said arms engaged with said pin. 
     
     
       4. A repulsion type circuit breaker movable contact device as in claim 1, wherein said second movable contact is freely pivotable about a rotation .[.peg.]. .Iadd.pin disposed at the rotational pivot and .Iaddend.secured by at least one movable contact support from which said second movable contact receives electrical current through sliding contact. 
     
     
       5. A repulsion type circuit breaker movable contact device as in claim 2, wherein said second movable contact is freely pivotable about a rotationn .[.peg.]. .Iadd.pin disposed at the rotational pivot and .Iaddend.secured by at least one movable contact support from which said second movable contact receives electrical current through sliding contact. 
     
     
       6. A repulsion type circuit breaker movable contact device as in claim 3, wherein said second movable contact is freely pivotable about a rotation .[.peg.]. .Iadd.pin disposed at the rotational pivot and .Iaddend.secured by at least one movable contact support from which said second movable contact receives electrical current through sliding contact. 
     
     
       7. A repulsion type circuit breaker movable contact device as in claim 1, wherein a lead wire connected to said second movable contact provides electrical current to said second movable contact. 
     
     
       8. A repulsion type circuit breaker movable contact device as in claim 2, wherein a lead wire connected to aid second movable contact provides electrical current to aid second movable contact. 
     
     
       9. A repulsion type circuit breaker movable contact device as in claim 3, wherein a lead wire connected to said second movable contact provides electrical current to said second movable contact. 
     
     
       10. A repulsion type circuit breaker movable contact device as in claim 2, wherein upon the moving apart of the first and second movable contacts, said pin slides along said arm towards said contact spring .[.twisting fulcrum.]. .Iadd.point of application for twisting.Iaddend.. 
     
     
       11. A replusion type circuit breaker movable contact device as in claim 3, wherein upon the moving apart of the first and second movable contacts, said pin slides along said arms towards said contact spring coil. 
     
     
       12. A repulsion type circuit breaker movable contact device as in claim 1, wherein said contact spring exerts a force and .[.an annular.]. .Iadd.a rotational .Iaddend.moment on said second movable contact, the .[.annular.]. .Iadd.rotation .Iaddend.moment decreasing upon movement of contact, the said second movable contact by the electromagnetic repulsion force. .Iadd. 
     
     
       13.  A repulsion type circuit breaker movable contact device comprising: an opening/closing mechanism operably attached to said first movable contact for driving said first movable contact between an open position and a closed position;   second movable contact for contacting said first movable contact when said first movable contact is in said closed position, said second movable contact being freely pivotable and adapted to receive an electromagnetic repulsion force from said first movable contact; and   a contact pressure applying member for applying a contact force to urge said second movable contact into contact with said first movable contact, wherein the flow of a predetermined amount of electric current through said first and second movable contacts produces the electromagnetic repulsion force with sufficient magnitude to move said second movable contact apart from said first movable contact, and wherein said contact pressure applying member exerts an annular moment on said second movable contact, the annular moment decreasing upon movement of said second movable contact by the electromagnetic repulsion force. .Iaddend..Iadd.14. A repulsion type circuit breaker movable contact device as in claim 13, further including a pin disposed in said second movable contact and an arm provided on said contact pressure applying member in engagement with said   
     
     
        pin. .Iaddend..Iadd.15.  A repulsion type circuit breaker movable contact device as in claim 13, further including a pin disposed in said second movable contact, a U-shaped portion on said contact pressure applying member, two arms engaged with said pin, and a coil disposed between said U-shaped portion and each of said arms. .Iaddend..Iadd.16. A repulsion type circuit breaker movable contact device as in claim 13, wherein said second movable contact is freely pivotable about a rotation pin disposed at the rotational pivot of said second movable contact and secured by at least one movable contact support, said second movable contact receiving electrical current through sliding contact. .Iaddend..Iadd.17. A repulsion type circuit breaker movable contact device as in claim 14, wherein said second movable contact is freely pivotable about a rotation pin disposed at the rotational pivot of said second movable contact and secured by at least one movable contact support, said second movable contact receiving electrical current through sliding contact. .Iaddend..Iadd.18. A repulsion type circuit breaker movable contact device as in claim 15, wherein said second movable contact is freely pivotable about a rotation pin disposed at the rotational pivot of said second movable contact and secured by at least one movable contact support, said second movable contact receiving 
     
     
        electrical current through sliding contact. .Iaddend..Iadd.19.  A repulsion type circuit breaker movable contact device as in claim 13, further including a lead wire connected to said second movable contact to provide electrical current to said second movable contact. .Iaddend..Iadd.20. A repulsion type circuit breaker movable contact device as in claim 14, further including a lead wire connected to said second movable contact to provide electrical current to said second movable contact. .Iaddend..Iadd.21. A repulsion type circuit breaker movable contact device as in claim 15, further including a lead wire connected to said second movable contact to provide electrical current to said second movable contact. .Iaddend..Iadd.22. A repulsion type circuit breaker movable contact device as in claim 14, wherein said contact pressure applying member has a point of application for twisting, and wherein upon the moving apart of the first and second movable contacts, said pin slides along said arm towards said point of application for twisting. .Iaddend..Iadd.23. A repulsion type circuit breaker movable contact device as in claim 15, wherein said contact pressure applying member includes a coil, and wherein upon the moving apart of the first and second movable contacts, said pin slides along said arms towards said coil. 
     
     
        .Iaddend..Iadd.24.  A repulsion type circuit breaker movable contact device comprising: a first movable contact;   an opening/closing mechanism operably attached to said first movable contact for driving said first movable contact between an open and a closed position;   a second movable contact for contacting said first movable contact when said first movable contact is in said closed position, said second movable contact being adapted to receive an electromagnetic repulsion force from said first movable contact; and   a force application member for applying a contact force to urge said second movable contact into contact with said first movable contact, the electromagnetic repulsion force moving said second movable contact apart from said first movable contact in opposition to the contact force upon flow of a predetermined amount of electric current through at least one of said first and second movable contacts, and said force application member applying the contact force to said second movable contact, within a time period after initial separation of said first and second movable contacts in response to the repulsion force, such that the contact force decreases as the distance between said first movable contact and said second movable contact increases. .Iaddend..Iadd.25. A repulsion type circuit breaker movable contact device as in claim 24, wherein the rotation moment due to the contact force applied to said second movable contact by said force application member gradually decreases in correspondence with a degree of disconnecting said second movable contact from said first movable contact.   
     
     
        .Iaddend..Iadd.26.  A repulsion type circuit breaker movable contact device as in claim 24, wherein the force application member comprises a contact spring. .Iaddend..Iadd.27. A repulsion type circuit breaker movable contact device as in claim 26, wherein said second movable contact has a rotational pivot, and said contact spring has a point of application for twisting displaced from the rotational pivot of said second movable contact. .Iaddend..Iadd.28. A repulsion type circuit breaker movable contact device as in claim 27, wherein said contact spring includes an arm and a coil contact spring, and said second movable contact includes a pin, said arm of said contact spring being engaged with said pin, and upon the moving apart of said first and second contacts, said pin slides along said arm towards said contact spring coil. .Iaddend..Iadd.29. A repulsion type circuit breaker movable contact device as in claim 26, wherein said contact spring exerts a force and an annular moment on said second movable contact, the annular moment decreasing upon movement of said second movable contact by the electromagnetic repulsion force. .Iaddend..Iadd.30. A repulsion type circuit breaker movable contact device as in claim 24, wherein said force application member comprises a twisted torsional coil contact spring.