Abstract: A hinge assembly having a hinge member and two adjacent panels. The hinge member is elongated with an inner surface that is slightly dished. There is an entry slot in the center of the inner surface extending inwardly into the member, the entry slot diverging into two curved branch slots extending in opposite directions. Each panel has a curved hinge element at each side of the panel with one hinge element curved in one direction and the other hinge element curved in the other direction, both hinge elements also curved toward each other. The hinge elements of the adjacent panels are mounted in the hinge member, the hinge elements passing together into the central slot and then diverging from each other into the branch slots. The panels can be moved in the slots between a folded position where they are almost parallel and an unfolded position where they are against the inner surface, almost aligned, and extending away from each other.

Abstract: A drum for a roll-up closure, the closure having a door of hinged together slats, one end of the door adapted to be mounted on the drum, the door adapted to be wound on the drum as the drum is rotated. The drum has a wall defining its shape with a depression in the wall extending both inwardly and across the width of the drum. The cross-section of the wall defines an increasing spiral from one side of the depression to the other side of the depression. An extension of the wall extends from the one side of the depression towards the other side to partially close the depression. The partially closed depression is shaped to receive the one end of the door to mount the door on the drum.

Abstract: A drum for a roll-up closure, the closure having a door of hinged together slats, one end of the door adapted to be mounted on the drum, the door adapted to be wound on the drum as the drum is rotated. The drum has a wall defining its shape with a depression in the wall extending both inwardly and across the width of the drum. The cross-section of the wall defines an increasing spiral from one side of the depression to the other side of the depression. An extension of the wall extends from the one side of the depression towards the other side to partially close the depression. The partially closed depression is shaped to receive the one end of the door to mount the door on the drum.

Abstract: A spring tensioning unit for a roll-up closure, the closure having a pair of end plates and an axle rotatably mounted on the endplates. A drum for carrying a closure is rotatably mounted on the axle, and a tensioning coil spring is mounted on the axle and connected between the axle and the drum. The tensioning unit has a ratchet wheel fixedly mounted on the axle adjacent one end plate, the wheel having spaced apart teeth. A stop member is slidably mounted on the one end plate with a stop tab cooperating with the teeth on the wheel to stop rotation of the wheel in a direction reducing tension on the spring. A lever is mounted between the wheel and the end plate, the lever having a lever tab for cooperating with the wheel, the lever movable on the axle to position the lever tab against a tooth and to then rotate the tooth, and the axle, in a direction to increase tension on the spring.

Abstract: A spring tensioning unit for a roll-up closure, the closure having a pair of end plates and an axle rotatably mounted on the endplates. A drum for carrying a closure is rotatably mounted on the axle, and a tensioning coil spring is mounted on the axle and connected between the axle and the drum. The tensioning unit has a ratchet wheel fixedly mounted on the axle adjacent one end plate, the wheel having spaced apart teeth. A stop member is slidably mounted on the one end plate with a stop tab cooperating with the teeth on the wheel to stop rotation of the wheel in a direction reducing tension on the spring. A lever is mounted between the wheel and the end plate, the lever having a lever tab for cooperating with the wheel, the lever movable on the axle to position the lever tab against a tooth and to then rotate the tooth, and the axle, in a direction to increase tension on the spring.

Abstract: A hinge assembly having a hinge member and two adjacent panels. The hinge member is elongated with an inner surface that is slightly dished. There is an entry slot in the center of the inner surface extending inwardly into the member, the entry slot diverging into two curved branch slots extending in opposite directions. Each panel has a curved hinge element at each side of the panel with one hinge element curved in one direction and the other hinge element curved in the other direction, both hinge elements also curved toward each other. The hinge elements of the adjacent panels are mounted in the hinge member, the hinge elements passing together into the central slot and then diverging from each other into the branch slots. The panels can be moved in the slots between a folded position where they are almost parallel and an unfolded position where they are against the inner surface, almost aligned, and extending away from each other.