Circuit breaker protective shutter apparatus

Claim 1

A protective apparatus for electric board cubicle circuit breaker assemblies having a frame including at least rear and side walls defining a cubicle therebetween, means mounting high voltage line terminals on said rear wall such that said terminals extend at least partially into said cubicle, and a movable circuit breaker housing movable into and out of said cubicle and having contact members located thereon which mate with said line tErminals when said housing is fully drawn into said cubicle, said protective apparatus comprising: a protective shutter assembly, including a partition member located in said cubicle and having openings therein corresponding to the locations of said line terminals in said cubicle and a shutter member mounted on said partition member and horizontally movable therewith; means mounting said shutter assembly in said cubicle for substantially horizontal movement toward and away from said rear wall between first and second positions, wherein, in said first position said shutter assembly is spaced from said rear wall a distance greater than the distance said line terminals extend into said cubicle from said rear wall, and wherein, in said second position said shutter assembly is located adjacent said rear wall such that said line terminals project through said openings in said partition member; means for moving said shutter member substantially vertically between closed and open positions, wherein in said closed position, said shutter member covers said openings in said partition member to prevent access to said line terminals and in said open position, said shutter member uncovers said openings in said partition member to permit access to said line terminals; and means provided on said movable housing for moving said shutter assembly between said first and second positions and for moving said shutter member between said closed and open positions.