Safety shutter device for drawout type switch gear

A drawout type switch gear comprising:

• a base frame,
• a circuit breaker which is movably mounted on said base frame in a manner to be drawn out of or pushed into said base frame when transferred between a drawout position and a pushed-in position,
• at least a pair of breaker-side main circuit lead conductors provided on said circuit breaker and corresponding pair of base frame-side main circuit lead conductors provided on said base frame, said breaker-side main circuit lead conductors being arranged to connect to said base frame-side main circuit lead conductors in said pushed-in position through a pair of contact fingers provided on said base frame, and
• a safety shutter device which is provided on said base frame and including:
• at least one lead conductor-carrying member provided on said base frame, leaving at least one insertion space between said lead conductor-carrying members or between the side wall of said base frame and one of said lead conductor-carrying members,
• at least one fixed shutter blade provided on the front face of said lead conductor-carrying member and each having a pair of openings for permitting said breaker-side main circuit lead conductors to pass therethrough, and
• at least one shutter driving unit accommodated in said insertion space and secured there by said fixed shutter blade, each of which includes, and
• a pair of movable shutter blades provided in front of said shutter driving unit, which are capable of a limited vertical movement by said drawout and pushed-in operation of said circuit breaker and, when said shutter driving unit is accommodated in said insertion space, are located behind said fixed shutter blades to constitute a shutter-closed state for the switch gear in combination with said fixed shutter blades.