Photoelectric controller having a shutter which is angularly movable from outside the enclosure for adjusting sensitivity

Claim 1

PHOTOELECTRIC CONTROL APPARATUS COMPRISING FIRST AND SECOND MEMBERS MATED TOGETHER TO FORM A LIGHT-SHIELDING PROTECTIVE ENCLOSURE FOR CONTROL CIRCUIT ELEMENTS INCLUDING A LIGHT-RESPONSIVE DEVICE AND ELECTRICAL RELAY, SAID ENCLOSURE HAVING A RELATIVELY SMALL LIGHT-TRANSMITTING PORTION THERETHROUGH AT ONE POSITION, AND A SHUTTER MECHANISM INCLUDING A LIGHT MASKING MEMBER DISPOSED WITHIN SAID ENCLOSURE IN PROXIMITY WITH THE LIGHT-TRANSMITTING PORTION THEREOF, A PIVOT MEMBER MOUNTED FOR ANGULAR MOVEMENTS ABOUT AN AXIS ON ONE OF SAID MEMBERS, MEANS SECURING SAID LIGHT MASKING MEMBER WITH SAID PIVOT MEMBER FOR ANGULAR MOVEMENTS THEREWITH ABOUT SAID AXIS, AND MEANS FRICTIONALLY RESTRAINING ANGULAR MOVEMENTS OF SAID MASKING MEMBER IN RELATION TO SAID ENCLOSURE, SAID MECHANISM INCLUDING MEANS PROJECTING THROUGH SAID ENCLOSURE AND ANGULARLY MOVABLE FROM OUTSIDE SAID ENCLOSURE TO APPLY TURNING TORQUES TO SAID MECHANISM ABOUT SAID AXIS, WHEREBY TURNING OF SAID MECHANISM AGAINST RESTRAING OF SAID RESTRAINING MEANS IS EFFECTIVE TO ADJUST THE POSITIONS OF SAID MASKING MEMBER IN RELATION TO SAID LIGHT-TRANSMITTING PORTION OF SAID ENCLOSURE AND TO REGULATE THE LIGHT REACHING SAID LIGHT-RESPONSIVE DEVICE.