A solenoid-driven automatic bus transfer switch may automatically transfer one or more electrical loads from a first power source to a second power source, or vice versa, in the event of a power failure or other casualty that affects either power source. The transfer switch may be operated in respon
A solenoid-driven automatic bus transfer switch may automatically transfer one or more electrical loads from a first power source to a second power source, or vice versa, in the event of a power failure or other casualty that affects either power source. The transfer switch may be operated in response to the energization of a solenoid coil, which causes a main shaft having a transfer element to rotate from being in contact with the first power source to being in contact with the second power source. The transfer element may be spring-mounted to the shaft, which ensures that a sufficient electrical contact exists between the surfaces of the transfer element and the respective leads of the first and second power sources, regardless of any wear or degradation that may be experienced at any of the surfaces.
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1. An automatic bus transfer switch for providing three-phase alternating current power to a three-phase load, the switch comprising: a normal source assembly comprising three normal source contacts, wherein each of the normal source contacts is adapted to receive alternating current power in one ph
1. An automatic bus transfer switch for providing three-phase alternating current power to a three-phase load, the switch comprising: a normal source assembly comprising three normal source contacts, wherein each of the normal source contacts is adapted to receive alternating current power in one phase from a normal power source;an alternate source assembly comprising three alternate source contacts, wherein each of the alternate source contacts is adapted to receive alternating current power in one phase from an alternate power source;a rocker assembly comprising three rockers and a shaft defining an axis, wherein each of the three rockers is mounted to the shaft, wherein each of the rockers comprises a normal rocker contact and an alternate rocker contact, wherein the normal rocker contact is adapted to make contact with one of the normal source contacts, and wherein the alternate rocker contact is adapted to make contact with one of the alternate source contacts;a solenoid-actuated automatic operator assembly mechanically connected to the shaft, the solenoid-actuated operator comprising a solenoid having at least one solenoid coil, a solenoid plunger and a mechanical linkage fixed to the solenoid plunger, the mechanical linkage providing the mechanical connection to the main shaft, wherein the automatic operator is adapted to rotate the shaft between a normal position and an alternate position, wherein each of the normal rocker contacts is in electrical contact with one of the normal source contacts when the shaft is in the normal position, and wherein each of the alternate rocker contacts is in electrical contact with one of the alternate source contacts when the shaft is in the alternate position;a main gear mounted to a proximal end of the main shaft;an idler shaft having an inertial cam connected to the mechanical linkage of the solenoid-actuated operator;a first idler gear fixed to a distal end of the idler shaft, wherein the first idler gear is meshed with the main gear;a load assembly comprising three load contacts, wherein each of the load contacts is adapted to connect with one phase of the three-phase load; andthree flexible conductors, wherein each of the flexible conductors provides an electrical connection between one of the rockers and one of the load contacts. 2. The automatic bus transfer switch of claim 1, wherein each of the flexible conductors comprises a braided copper loop providing two conductive paths between one of the rockers and one of the load contacts. 3. The automatic bus transfer switch of claim 1, wherein each of the rockers is mounted to the shaft in a spring-mounted connection, wherein each of the spring-mounted connections biases each of the normal rocker contacts into one of the normal source contacts when the shaft is in the normal position, andwherein each of the spring-mounted connections biases each of the alternate rocker contacts into one of the alternate source contacts when the shaft is in the alternate position. 4. The automatic bus transfer switch of claim 1, wherein the rocker assembly is mass-centered about the axis. 5. A transfer switch comprising: at least one first source contact;at least one second source contact;at least one load contact;a main shaft defining an axis, wherein the main shaft is adapted to rotate between a first angular position and a second angular position;at least one rotatable transfer element fixed to the main shaft, wherein the transfer element is adapted to rotate between a first contact position in which the main shaft is in the first angular position and a second contact position in which the main shaft is in the second angular position;a load platform providing support for the at least one load contact;a frame providing support for the main shaft and the load platform;a source platform providing support for the at least one first source contact, the at least one second source contact and the frame on a top side of the source platform;a base platform mounted to a bottom side of the source platform;a U-shaped source connector mounted to the at least one first source contact;a solenoid-actuated operator mechanically connected at least one rotatable transfer element, wherein the solenoid-actuated operator is adapted to cause the at least one rotatable transfer element to rotate between the first contact position and the second contact position; andat least one flexible conductor, wherein the at least one flexible conductor provides an electrical connection between the at least one transfer element and the at least one load contact;wherein the at least one first source contact is mounted to the source platform on a first side of the axis and the at least one second source contact is mounted to the source platform on a second side of the axis;wherein the U-shaped source connector is electrically connected to the at least one first source contact on the top side of the source platform and extends between the base platform and the source platform from the first side of the axis to the second side of the axis;wherein the at least one transfer element is in electrical contact with the at least one first source element when the at least one rotatable transfer element is in the first contact position, andwherein the at least one transfer element is in electrical contact with the at least one second source element when the at least one rotatable transfer element is in the second contact position. 6. The transfer switch of claim 5, wherein the transfer switch is substantially mass-centered about a centerline defined by the axis. 7. The transfer switch of claim 6, further comprising a transfer operator assembly adapted to rotate the main shaft, wherein the solenoid-actuated operator comprises a solenoid having at least one solenoid coil, a solenoid plunger and a mechanical linkage fixed to the solenoid plunger, andwherein the mechanical linkage provides the mechanical connection to the main shaft. 8. The transfer switch of claim 7, wherein the solenoid comprises an adjustable spring providing tension to the solenoid plunger. 9. The transfer switch of claim 6, wherein the at least one flexible conductor is formed in at least one continuous loop having a first connection to the transfer element and a second connection to the load contact. 10. The transfer switch of claim 9, wherein the at least one continuous loop is substantially mass-centered about the centerline. 11. The transfer switch of claim 9, wherein the at least one continuous loop is a compressed mesh tubing. 12. The transfer switch of claim 6, wherein the at least one transfer element comprises a trench having a base, a first end and a second end. 13. The transfer switch of claim 12, wherein the at least one transfer element comprises a first transfer contact mounted to the first end and a second transfer contact mounted to the second end, wherein the first transfer contact is adapted to contact the at least one first source contact when the shaft is in the first angular position, andwherein the second transfer contact is adapted to contact the at least one second source contact when the shaft is in the second angular position. 14. The transfer switch of claim 12, further comprising at least a first spring and a second spring for fixing the base of the at least one transfer element to the main shaft, and wherein the first spring is configured to bias the at least one transfer element into contact with the at least one first source contact when the main shaft is in the first angular position, andwherein the second spring is configured to bias the at least one transfer element into contact with the at least one second source contact when the main shaft is in the second angular position. 15. The transfer switch of claim 5, wherein the transfer switch is adapted to transfer three-phase electrical power from one of a first power source and a second power source to at least one load. 16. The transfer switch of claim 5, wherein the transfer switch comprises three transfer elements, three first source contacts, three second source contacts, three load contacts and three flexible conductors, wherein each of the three transfer elements is fixed to the main shaft,wherein each of the three flexible conductors provides electrical connections between one of the transfer elements and one of the load contacts,wherein each of the transfer elements is in electrical contact with one of the first source elements when the main shaft is in the first angular position, andwherein each of the transfer elements is in electrical contact with one of the second source elements when the main shaft is in the second angular position. 17. A transfer switch comprising: at least one first source contact;at least one second source contact;at least one load contact;a main shaft defining an axis, wherein the main shaft is adapted to rotate between a first angular position and a second angular position;at least one rotatable transfer element fixed to the main shaft, wherein the transfer element is adapted to rotate between a first contact position in which the main shaft is in the first angular position and a second contact position in which the main shaft is in the second angular position;a solenoid-actuated operator mechanically connected to at least one rotatable transfer element, wherein the solenoid-actuated operator is adapted to rotate the main shaft to cause the at least one rotatable transfer element to rotate between the first contact position and the second contact position, the solenoid-actuated operator comprising a solenoid having at least one solenoid coil, a solenoid plunger and a mechanical linkage fixed to the solenoid plunger, the mechanical linkage providing the mechanical connection to the main shaft;at least one flexible conductor, wherein the at least one flexible conductor provides an electrical connection between the at least one transfer element and the at least one load contact;a main gear mounted to a proximal end of the main shaft;an idler shaft having an inertial cam connected to the mechanical linkage of the solenoid-actuated operator; anda first idler gear fixed to a distal end of the idler shaft;wherein the first idler gear is meshed with the main gear;wherein the transfer switch is substantially mass-centered about a centerline defined by the axis;wherein the at least one transfer element is in electrical contact with the at least one first source element when the at least one rotatable transfer element is in the first contact position; andwherein the at least one transfer element is in electrical contact with the at least one second source element when the at least one rotatable transfer element is in the second contact position. 18. The transfer switch of claim 17, further comprising: a manual operator mechanically connected to a second idler gear fixed to a proximal end of the idler shaft. 19. The transfer switch of claim 17, wherein the at least one flexible conductor is formed in at least one continuous loop having a first connection to the transfer element and a second connection to the load contact. 20. The transfer switch of claim 19, wherein the at least one continuous loop is substantially mass-centered about the centerline. 21. The transfer switch of claim 19, wherein the at least one continuous loop is a compressed mesh tubing.
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이 특허에 인용된 특허 (17)
Castenschiold Rene (New Vernon NJ) Andersen John P. (Hackettstown NJ), Automatic transfer switch.
Sharaf Nadir (Mounds View MN) Evenson Rickie Allen (Ham Lake MN) Fabian Alan Norman (Roseville MN), Electric transfer switch having three-position toggle mechanism.
Rademacher, Loren L.; Hokenson, Larry D.; Simon, Thomas C.; Morley, John E.; Smith, Larry H.; Peterson, Michael A.; Hawkins, Peter M.; Xykis, Constantine, Transfer switch with improved actuator.
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