Patent ID: 9487984
Filing Date: 2016-11-08
CPC Classification: E05D,E05Y

Claim Text:
1. A trailer overhead door system for a trailer having a door opening, a floor opposite a roof, and a first side wall opposite a second side wall, and a door opening header above said door opening, the trailer overhead door system comprising: a trailer door for enclosing said door opening, said trailer door comprising a door top rail, a left vertical side and a right vertical side; a left track for slidable receipt with said left vertical side of the door, said left track extending along said first vertical side of said door opening and along a portion of the roof of the trailer; a right track for slidable receipt with said right vertical side of the door, said right track extending along said second vertical side of said door opening and along a portion of the roof of the trailer; a counterbalance system for maintaining said trailer door in an open position, closed position, and positions therebetween, said counterbalance system comprising at least one spring, a shaft, at least one cable drum, and at least one lifting cable, said lifting cable comprising a first end and a second end; and at least one return pulley for guiding said lifting cable, wherein said first end of said lifting cable runs generally parallel to said roof and is connected to said door top rail, wherein said lifting cable extends around said return pulley, and wherein said second end of said lifting cable connects to said at least one cable drum.