Spiral motor coil

Claim 2

An electromagnetic coil consisting of a rigid bimetallic plate of substantially uniform thickness and spiral configuration, the axis of the spiral extending in the direction of the thickness of the plate, the plate consisting of a first metal component and a second metal component laminated thereto, the plate having inner and outer convolutions provided with means for securing said convolutions to a rigid support structure, and means providing terminal connections to the coil.

Claim 3

An electromagnetic coil consisting of a rigid bimetallic plate, the plate consisting of a first metal component of substantially uniform thickness and spiral configuration, and a second metal component of substantially uniform thickness and spiral configuration superimposed on, and laminated to, the first component, the first metal component providing a rigid backing and the second metal component being of higher conductivity metal than the first, the plate having inner and outer convolutions provided with means for securing the convolutions to a rigid support structure, and means providing terminal connections to the coil.

Claim 4

An electromagnetic coil consisting of a rigid bimetallic plate, the plate consisting of a first metal component of substantially uniform thickness and spiral configuration, and a second metal component of substantially uniform thickness and spiral configuration superimposed on, and laminated to, the first component, the first metal component providing a rigid backing and the second metal component being of higher conductivity metal than the first, the plate having inner and outer convolutions provided with means for securing the convolutions to a rigid support structure, and means providing terminal connections to the coil.

Claim 5

An electromagnetic coil according to claim 2, wherein the first and second metal components are of stainless steel and copper, respectively.

Claim 6

An electromagnetic coil according to claim 3, wherein the copper is explosion bonded onto the steel.

Claim 7

An electromagnetic coil consisting of a rigid, bimetallic plate of spiral configuration, the plate consisting of a stainlEss steel backing having a cladding of copper explosion bonded thereto, the thickness of the backing being about four times the thickness of the cladding, the plate having inner and outer convolutions provided with means for securing said convolutions to a rigid support structure, and means providing terminal connections to the coil.

Claim 8

An electromagnetic coil consisting of a rigid, bimetallic plate of spiral configuration, the plate consisting of a stainlEss steel backing having a cladding of copper explosion bonded thereto, the thickness of the backing being about four times the thickness of the cladding, the plate having inner and outer convolutions provided with means for securing said convolutions to a rigid support structure, and means providing terminal connections to the coil.

Claim 9

In a vacuum circuit breaker: an evacuated housing, separable contact structure mounted within the housing, the contact structure including a movable contact movable from a closed circuit position to an open circuit position, a shaft connected to and movable with the movable contact, a fixed mounting structure within the housing, a pair of inner and outer support hubs rigidly mounted on the mounting structure, the support hubs having respective aligned openings for receiving and retaining the shaft in the respective closed circuit and open circuit positions, an annular conductive disc rigidly mounted on the shaft, an electromagnetic coil rigidly mounted on the mounting structure coaxially with the disc, the disc lying adjacent to the coil when the movable contact is in the closed circuit position, and means for supplying electric current to the coil whereby to repel the disc from the coil and so drive the movable contact rapidly to the open circuit position, the electromagnetic coil consisting of a rigid bimetallic plate of spiral configuration, the plate consisting of a first metal component and a second metal component of higher conductivity laminated to the first component, the second metal component defining the face of the plate nearer to the disc, the coil having inner and outer convolutions which are rigidly bolted to the mounting structure.

Claim 10

In a vacuum circuit breaker: an evacuated housing, separable contact structure mounted within the housing, the contact structure including a movable contact movable from a closed circuit position to an open circuit position, a shaft connected to and movable with the movable contact, a fixed mounting structure within the housing, a pair of inner and outer support hubs rigidly mounted on the mounting structure, the support hubs having respective aligned openings for receiving and retaining the shaft in the respective closed circuit and open circuit positions, an annular conductive disc rigidly mounted on the shaft, an electromagnetic coil rigidly mounted on the mounting structure coaxially with the disc, the disc lying adjacent to the coil when the movable contact is in the closed circuit position, and means for supplying electric current to the coil whereby to repel the disc from the coil and so drive the movable contact rapidly to the open circuit position, the electromagnetic coil consisting of a rigid bimetallic plate of spiral configuration, the plate consisting of a first metal component and a second metal component of higher conductivity laminated to the first component, the second metal component defining the face of the plate nearer to the disc, the coil having inner and outer convolutions which are rigidly bolted to the mounting structure.

Claim 11

In a vacuum circuit breaker: an evacuated housing, separable contact structure mounted within the housing, the contact structure including a movable contact movable from a closed circuit position to an open circuit position, a shaft connected to and movable with the movable contact, a fixed mounting structure within the housing, a pair of inner and outer support hubs rigidly mounted on the mounting structure, the support hubs having respective aligned openings for receiving and retaining the shaft in the respective closed circuit and open circuit positions, an annular conductive disc rigidly mounted on the shaft, a pair of electromagnetic coils rigidly mounted on the mounting structure coaxially with the disc, the disc lying adjacent to one coil when the movable contact is in the closed circuit position and adjacent to the other coil when the movable contact is in the open circuit position, and means for supplying electric current to the coils whereby to repel the disc from the adjacent coil so as to drive the movable contact rapidly from one position to the other, each electromagnetic coil consisting of a rigid bimetallic plate of spiral ocnfiguration, the plate consisting of a first metal component and a second metal component of higher conductivity laminated to the first component, the second metal component defining the face of the plate nearer to the disc, the coil having inner and outer convolutions which are rigidly bolted to the mounting structure.

Claim 12

In a vacuum circuit breaker: an evacuated housing, separable contact structure mounted within the housing, the contact structure including a movable contact movable from a closed circuit position to an open circuit position, a shaft connected to and movable with the movable contact, a fixed mounting structure within the housing, a pair of inner and outer support hubs rigidly mounted on the mounting structure, the support hubs having respective aligned openings for receiving and retaining the shaft in the respective closed circuit and open circuit positions, an annular conductive disc rigidly mounted on the shaft, a pair of electromagnetic coils rigidly mounted on the mounting structure coaxially with the disc, the disc lying adjacent to one coil when the movable contact is in the closed circuit position and adjacent to the other coil when the movable contact is in the open circuit position, and means for supplying electric current to the coils whereby to repel the disc from the adjacent coil so as to drive the movable contact rapidly from one position to the other, each electromagnetic coil consisting of a rigid bimetallic plate of spiral ocnfiguration, the plate consisting of a first metal component and a second metal component of higher conductivity laminated to the first component, the second metal component defining the face of the plate nearer to the disc, the coil having inner and outer convolutions which are rigidly bolted to the mounting structure.

Claim 13

A vacuum circuit breaker according to claim 7, wherein said first metal components are of stainless steel and said second metal components are of copper plate explosion bonded thereto.

Claim 14

A vacuum circuit breaker according to claim 8, wherein each of the coils is of conically shaped spiral configuration, and wherein the annular disc provides a pair of opposite faces of frusto-conical shape, each face being complementary to the nearer face of the respective coil.

Claim 15

A vacuum circuit breaker according to claim 9, wherein the annular disc is of high strength aluminum alloy.