Patent ID: 7373675

Claim:
A convertible sofa bed ( 10 a , 10 b ) comprising: a seat frame ( 16 ); a back frame ( 20 ); a support structure ( 26 ); and a linkage assembly ( 102 , 103 ) pivotally coupling the seat frame ( 16 ) to the back frame ( 20 ), and pivotally coupling the seat frame ( 16 ) to the support structure ( 26 ), and pivotally coupling the back frame ( 20 ) to the support structure ( 26 ); said convertible sofa has an electrical drive assembly ( 144 , 146 , 148 , 150 , 152 , 160 , 162 ) having a motor ( 144 ) mounted to the support structure; a cable drive ( 146 , 148 ) rotatably coupled to and extending from the motor ( 144 ); a threaded drive screw ( 160 , 162 ) having an external thread; a right angle gear box ( 150 , 152 ) mounted to an aft portion of the support structure ( 26 ), the right angle gear box ( 150 , 152 ) having a first input rotatably coupled to the cable drive ( 146 , 148 ) and a second input rotatably coupled to a first end of the threaded drive screw ( 160 , 162 ), the right angle gear box ( 150 , 152 ) responsive to the motor ( 144 ) to rotate the threaded drive screw ( 160 , 162 ) in a substantially horizontal plane; and a drive nut assembly mounted to the back carrier link and the threaded drive screw, the drive nut assembly ( 176 , 178 ) adapted to linearly travel on the threaded drive screw ( 160 , 162 ) to cause movement of the back carrier link ( 107 , 118 ) in response to rotation of the threaded drive screw ( 160 , 162 ).