US Patent 9004142 Blind assembly with two blind head rail

A blind for a building opening, having; an upper blind roller, located in an upper region of the head rail, a lower blind attachment located in a lower region of the head rail, an upper blind stored on the upper blind roller, a lower blind stored on the lower blind attachment, upper and lower blind control mechanism operable to operate the blinds and in which the upper blind roller is located in an upper plane in the head rail and the lower blind attachment is located in a lower plane, the axes being displaced vertically from one another, and in which the upper blind depends down beside the lower blind attachment, and in which the lower blind depends down alongside said upper blind, so as to provide a head rail having a slim, aesthetically pleasing profile.