Patent ID: 6990771

Claim:
In combination with a building structure, the building structure including first and second walls at an angle with respect to one another and coterminating at a corner, and including, to walk into and out of the building structure, a first opening formed in said first wall and having a first side spaced apart from said corner, and a second opening formed in said second wall and having a second side spaced apart from said corner, said second opening coterminating with said first opening at said corner in the building structure, improvements for accessing the building structure through said openings, said improvements including (a) a first horizontally oriented track extending across said first opening; (b) a second horizontally oriented track extending across said second opening and at said angle with respect to said first track; (c) at least a first panel slidable mounted in said first opening on said first track and having a leading portion and a rear portion; (d) at least a second panel slidable mounted in said second opening on said second track; (e) a first rotatable pulley ( 223 ) mounted at a position lateral from said first side; (f) a second rotatable pulley ( 222 ) mounted at a position lateral from said second side; (g) a first guide unit ( 140 A) mounted at said corner; (h) a second guide unit ( 140 ) mounted at said corner; (i) a belt ( 221 ) extending around said first and second pulleys and said first and second guide units such that sections of said belt extend from said first pulley ( 223 ) to said corner and generally are at said angle with respect to sections of said belt extending from said second pulley ( 222 ) to said corner, said belt including (i) first and second ends ( 224 ) ( 225 ) connected to said first panel ( 211 ), and (ii) an intermediate portion attached to said second panel ( 230 ); and, (j) a motor for driving one of said pulleys to move simultaneously each of said first and second panels with respect to said corner.