An emergency bi-fold door closing prevention system includes a building having an access opening with an upper edge. A bi-fold door is hingedly mounted to the building wall and includes a plurality of panels each being laterally elongated. The plurality of panels includes a bottom panel having a bottom edge that is positionable adjacent to a floor surface to define a closed position. A safety line assembly is attached to and extends between the building wall adjacent to the upper edge and the bi-fold door adjacent to the bottom edge. The safety line has an extendable length. The length of the safety line assembly extends when the bi-fold door moves toward the closed position below a threshold velocity. The length of the safety line assembly is inhibited from extending when the bi-fold door moves toward the closed position above the threshold velocity to prevent unimpeded falling of the bi-fold door.

Provided is a self-retracting device including a rotatable hub assembly. The rotatable hub assembly includes a first half and a second half. The first half includes a slot for an axle. The second half includes a retraction member and a slot for the axle. The self-retracting device also includes an axle with a body extending through the slot of the first half and the slot of the second half and a line. A first end of the line includes a loop, wherein the loop is between the first half and the second half and the axle body extends through an opening defined by the loop. The rotatable hub assembly is configured to retract the line when the rotatable hub assembly moves in the first rotational direction and pay out the line when the rotatable hub assembly moves in a second rotational direction opposite the first rotational direction.

A rotational friction brake actuated and regulated by the rate of change of the angular speed is disclosed. The rotational friction brake includes a first body and a second body rotationally attached to the first body. The second body is arranged to rotate around a rotational center axis of the second body. An actuator arrangement is configured to move a second friction surface into frictional engagement with a first friction surface. The actuator arrangement includes an actuator arm pivotably attached to the second body in a pivot point that is eccentrically offset to the rotational center axis. The actuator arrangement has a radius of gyration (RG) longer than a distance from the pivot point to the rotational center axis. The actuator arrangement has an internal flexibility which allows its shape to depend on centrifugal forces. A fishing reel comprising such a rotational friction brake is also disclosed.

A slow retraction mechanism, a locking-type slow retraction device and a winding device. The slow retraction mechanism fits with a winder including a main shaft and a main body rotatably sleeved thereon. The main body can rotate around the main shaft to wind or unwind flexible materials. The slow retraction mechanism includes a blocking part, a decelerating part rotatably arranged on the main body, and an elastic part arranged on the main body and connected with the decelerating part. When the main body rotates around the main shaft in a first direction to wind the flexible material, the decelerating part rotates relative to the main body along a second direction opposite to the first direction to approach the blocking part to rub against the blocking part to reduce a rotation speed. The elastic part applies an elastic force to hinder the decelerating part from rotating along the second direction.

A rotational friction brake actuated and regulated by the rate of change of the angular speed is disclosed. The rotational friction brake includes a first body and a second body rotationally attached to the first body. The second body is arranged to rotate around a rotational center axis of the second body. An actuator arrangement is configured to move a second friction surface into frictional engagement with a first friction surface. The actuator arrangement includes an actuator arm pivotably attached to the second body in a pivot point that is eccentrically offset to the rotational center axis. The actuator arrangement has a radius of gyration (RG) longer than a distance from the pivot point to the rotational center axis. The actuator arrangement has an internal flexibility which allows its shape to depend on centrifugal forces. A fishing reel comprising such a rotational friction brake is also disclosed.

A vehicle having a door slidably mounted on a shell. The vehicle includes at least one assistance device, comprising both a winder carrying a strap and a receptacle, the winder including a brake for braking unwinding of the strap from the winder, one of the winder and receptacle being fastened to the shell and one of the winder and receptacle being fastened to the door, the strap carrying a latchplate suitable for being reversibly attached to the receptacle.

The present disclosure is directed to swing systems and methods of using same. In particular, the present disclosure is directed to swing propulsion systems including a belt device and a handheld swing device.

A slow retraction mechanism, a locking-type slow retraction device and a winding device. The slow retraction mechanism fits with a winder including a main shaft and a main body rotatably sleeved thereon. The main body can rotate around the main shaft to wind or unwind flexible materials. The slow retraction mechanism includes a blocking part, a decelerating part rotatably arranged on the main body, and an elastic part arranged on the main body and connected with the decelerating part. When the main body rotates around the main shaft in a first direction to wind the flexible material, the decelerating part rotates relative to the main body along a second direction opposite to the first direction to approach the blocking part to rub against the blocking part to reduce a rotation speed. The elastic part applies an elastic force to hinder the decelerating part from rotating along the second direction.

A vehicle having a door slidably mounted on a shell. The vehicle includes at least one assistance device, comprising both a winder carrying a strap and a receptacle, the winder including a brake for braking unwinding of the strap from the winder, one of the winder and receptacle being fastened to the shell and one of the winder and receptacle being fastened to the door, the strap carrying a latchplate suitable for being reversibly attached to the receptacle.

An emergency bi-fold door closing prevention system includes a building having an access opening with an upper edge. A bi-fold door is hingedly mounted to the building wall and includes a plurality of panels each being laterally elongated. The plurality of panels includes a bottom panel having a bottom edge that is positionable adjacent to a floor surface to define a closed position. A safety line assembly is attached to and extends between the building wall adjacent to the upper edge and the bi-fold door adjacent to the bottom edge. The safety line has an extendable length. The length of the safety line assembly extends when the bi-fold door moves toward the closed position below a threshold velocity. The length of the safety line assembly is inhibited from extending when the bi-fold door moves toward the closed position above the threshold velocity.