Onan Corporation

Alan Norman Fabian

Rickie A Evenson

Nadir Sharaf

Michael J Jannesari

An electric transfer switch includes a three-position toggle mechanism and a crossbar which is mounted on the toggle mechanism. The crossbar carries a plurality of moveable contacts and is rotated by the toggle mechanism. The moveable contacts normally contact one set of the stationary contacts in one closed position which are connected to a normal main power supply. The moveable contacts are rotated to a neutral non-power line in an open position, and are further rotated to another closed position, which are connected to a standby emergency power supply to supply electricity to the transferred electrical loads. The toggle mechanism includes a multi-bar linkage which is rotated by a handle of the toggle mechanism among the open position and two closed positions. A plurality of springs and catches are used to maintain the contact between the moveable contacts and the stationary contacts, even when a 'fault' current passes through the contact tips of the moveable and stationary contacts.

Electric transfer switch having three-position toggle mechanism

A three-position actuating mechanism (10) for a transfer switch (11) is disclosed. The transfer switch is movable by the actuator (10) between a contact block (13) corresponding to a normal power source, and a contact block (14) interconnected to a standby or emergency power source. The actuator (10) has a pair of disk drives (22, 23) interconnected to solenoids (20, 21) by means of linkages (33, 34). The disk drives (22, 23) are interconnected to each other and to a driven disk (26) by means of a pin (30). Energization of the solenoids (20, 21) causes movement of the corresponding solenoid plunger (31, 32) and rotation of the disk drives (22, 23), so as to cause rotation of the contact crossbar (16) and transfer of the contacts (15, 18) between the two power sources.

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Roseville, MN, United States of America

Alan Norman Fabian