Photoelectric control device with rotatable housing for adjustable light control to the photosensitive element

Claim 1

A PHOTOELECTRIC CONTROL DEVICE COMPRISING, IN COMBINATION, A BASE MEMBER HAVING OPPOSITE SIDES, PHOTOELECTRIC MEANS MOUNTED ON ONE SIDE OF SAID BASE MEMBER AND HAVING A LIGHT SENSITIVE ELEMENT EXTENDING IN A PLANE, AN OPAQUE HOUSING COVERING SAID ONE SIDE OF SAID BASE MEMBER AND LEAVING SAID OPPOSITE SIDE THEREOF OPEN TO THE EXTERIOR OF SAID HOUSING, SAID HOUSING HAVING A LIGHT TRANSMITTING WINDOW THROUGH WHICH EXTERNAL LIGHT MAY ENTER THE INTERIOR OF SAID HOUSING, SAID HOUSING BEING ADJUSTABLE RELATIVE TO SAID BASE MEMBER BETWEEN A POSITION WHEREIN SAID LIGHT SENSITIVE ELEMENT DIRECTLY FACES SAID WINDOW SO AS TO BE SUBSTANTIALLY NORMAL TO THE AXIS THEREOF, AND A POSITION WHEREIN THE PLANE OF SAID LIGHT SENSITIVE ELEMENT IS AT A DIFFERENT ANGLE TO SAID WINDOW AXIS, AND SECURING MEANS RELEASABLY HOLDING SAID HOUSING AND SAID BASE MEMBER IN ADJUSTED POSITION, WHEREBY THE RESPONSE OF SAID PHOTOELECTRIC MEANS TO THE ILLUMINATION LEVEL OF THE ENTERING LIGHT MAY BE VARIED.