公开(公告)号：US09969576B1

公开(公告)日：2018-05-15

申请号：US15439587

申请日：2017-02-22

申请人： Charles J. Ashelin ,  Collin Thole ,  Frank Heim ,  Timothy J. Schmidt

发明人： Charles J. Ashelin ,  Collin Thole ,  Frank Heim ,  Timothy J. Schmidt

IPC分类号： E04B1/34 ,  B65G69/00

CPC分类号： B65G69/008

摘要： Inflatable weather barriers for loading docks are disclosed. An example weather barrier includes an upper bellows defining a header air chamber between a top portion and a bottom portion of the upper bellows. A blower is in fluid communication with the header air chamber and the blower is selectively activated to discharge a pressurized air into the header air chamber to urge the upper bellows from a raised position toward a lowered position. The weather barrier includes a first extension spring that is under a first extension spring tension, a first pulley, and a first elongate member that is pliable. The first elongate member is under a first elongate member tension that urges the upper bellows toward the raised position. The first elongate member is wrapped at least partially around the first pulley and the first extension spring being connected to the first pulley such that the first pulley transmits the first extension spring tension to the first elongate member to subject the first elongate member to the first elongate member tension.