Three-position actuating mechanism for transfer switch

A transfer switch for transferring an electrical load from a normal power source to an emergency power source, and vice versa, comprising:

• (a) a rotatable cross bar which rigidly supports a plurality of movable contacts, said movable contacts being rotatable between a position contacting a normal power source stationary contact, a position contacting an emergency power source stationary contact, and an intermediate neutral position therebetween;
• (b) a driven disk having a shaft which is interconnected to said rotatable cross bar, said driven disk having an eccentric pin, wherein rotation of said driven disk causes rotation of said cross bar;
• (c) first and second rotatable drive disks in parallel relationship to each other and to said driven disk, each of said drive disks having an arcuate slot which slidably accommodates said pin;
• and
• (d) linear actuating means operably interconnected to said pin so as to cause arcuate movement thereof, wherein a transfer from one of said power source positions to a neutral position results in free movement of said pin in said slot of one of said drive disks, said other drive disk's rotation causing rotation of said driven disk and rotation of said cross bar.