An example apparatus includes a sensor to detect a lateral edge of a door curtain within a guide of a door, and a controller to identify when the door curtain transitions from an operational state to a breakaway state based on a signal from the sensor, the operational state corresponding to when the lateral edge of the door curtain is enclosed by the guide as the door curtain moves between open and closed positions, and the breakaway state corresponding to when a portion of the lateral edge of the door curtain below an upper end of the guide breaks away from the guide.

An example apparatus includes a sensor to detect a lateral edge of a door curtain within a guide of a door, and a controller to identify when the door curtain transitions from an operational state to a breakaway state based on a signal from the sensor, the operational state corresponding to when the lateral edge of the door curtain is enclosed by the guide as the door curtain moves between open and closed positions, and the breakaway state corresponding to when a portion of the lateral edge of the door curtain below an upper end of the guide breaks away from the guide.

A thermal barrier configured to be rolled and unrolled while providing a thermal value of greater than about R=3. The thermal barrier comprises multiple layers including a first layer comprising a fiber mesh core and material selected from the group comprising: polyurethane, rubber, and polyvinylchloride, a second layer bonded to the first layer, the second layer comprising material selected from the group comprising: polyolefin foam, polyurethane foam and rubber based foam, and a third layer bonded to the second layer, the third layer comprising a thin film or fabric material selected from the group comprising: polyester, polyolefin, polyurethane and nylon, wherein the composite material maintains a consistent linear dimension within about 1% of total length in a coiled configuration compared with a linear configuration.

A thermal barrier configured to be rolled and unrolled while providing a thermal value of greater than about R=3. The thermal barrier comprises multiple layers including a first layer comprising a fiber mesh core and material selected from the group comprising: polyurethane, rubber, and polyvinylchloride, a second layer bonded to the first layer, the second layer comprising material selected from the group comprising: polyolefin foam, polyurethane foam and rubber based foam, and a third layer bonded to the second layer, the third layer comprising a thin film or fabric material selected from the group comprising: polyester, polyolefin, polyurethane and nylon, wherein the composite material maintains a consistent linear dimension within about 1% of total length in a coiled configuration compared with a linear configuration.

The present disclosure discloses a locking seat, which comprises a shell and a pivot seat pivotally installed on the shell, wherein the pivot seat is provided with a positioning hole, and a unidirectional positioning device is provided between the shell and the pivot seat. The present disclosure further discloses a simple telescopic door fence, which comprises two installing seats oppositely provided and a folding rod pivotally installed between the two installing seats, wherein at least one of the installing seats is provided with the locking seat, the folding rod is rotatable in a predetermined direction, at least two folding rods are provided, and a cloth is provided between the two folding rods. The unidirectional rotation of the folding rod is realized by the unidirectional positioning device, so that the cloth can be adjusted and rolled up.

A retractable door sill, including: a mounting base, the mounting base including an upper fixing base and a lower fixing base; a rotating drum, the rotating drum being arranged between the tipper fixing base and the lower fixing base, a partition cloth, a torsion spring being configured to make the rotating drum rotate in one direction around its axis, the rotating drum wind up the partition cloth; and an adjusting device, the adjusting device comprising an adjusting rod and an adjusting mechanism, one end of the torsion spring being connected to the rotating drum, the other end of the torsion spring being connected to the adjusting rod of the adjusting device, the adjusting mechanism being configured to enable the adjusting rod to rotate unidirectionally around its own axis, and the adjusting rod being configured to change a torsional deformation of the torsion spring through its own rotation.

The invention relates to a rolling door comprising a door leaf which can be moved between an open position, in which it at least partially releases a wall opening and forms a multi-layer winding above the wall opening, and a closed position, in which it at least partially closes the wall opening, as well as comprising joint assemblies arranged in the region of the lateral edges of the door leaf, at least sections of which are running in the direction of gravity in the closed position, and secured to the door leaf, for guiding the door leaf movement, each of which includes a plurality of joint elements articulately connected relative to joining shafts running perpendicular to the lateral edges and approximately parallel to the door leaf plane, wherein at least sections of the door leaf are made of a bendable material, such as a plastic film, which is stabilised by two, three or more stabilising devices running perpendicular to the lateral edges and in the door leaf plane, wherein the door leaf is only connected to the joint assemblies via the stabilising devices.

The invention relates to a rolling door comprising a door leaf which can be moved between an open position, in which it at least partially releases a wall opening and forms a multi-layer winding above the wall opening, and a closed position, in which it at least partially closes the wall opening, as well as comprising joint assemblies arranged in the region of the lateral edges of the door leaf, at least sections of which are running in the direction of gravity in the closed position, and secured to the door leaf, for guiding the door leaf movement, each of which includes a plurality of joint elements articulately connected relative to joining shafts running perpendicular to the lateral edges and approximately parallel to the door leaf plane, wherein at least sections of the door leaf are made of a bendable material, such as a plastic film, which is stabilised by two, three or more stabilising devices running perpendicular to the lateral edges and in the door leaf plane, wherein the door leaf is only connected to the joint assemblies via the stabilising devices.

A retractable curved door assembly includes a spring-loaded roller assembly having a reel structure configured to rotate about an axis of rotation thereof, a rail extending away from the spring-loaded roller assembly in a direction perpendicular to the axis of rotation of the reel structure with at least a portion of the rail curving about an axis arranged parallel to the axis of rotation of the reel structure, a door end structure slidably engaging the rail, a flexible screen coupled to the reel structure and to the door end structure, and a tension element coupled to the reel structure and the door end structure. A greater tensile force is applied to the tension element than to the flexible screen when the door end structure is slid along the rail in a direction away from the spring-loaded roller assembly to prevent buckling of the flexible screen.

Various embodiments include bullet-resistant multilayered curtain that can be quickly deployed to secure an entranceway from attackers and deter them from entering. A bullet-resistant multilayered curtain may be contained above an entranceway in a casing and supported by a quick release pin when in the stored configuration. The bullet-resistant curtain includes multiple horizontal bars that are distributed along the length of the bullet-resistant curtain. Firmly fixed on the perimeter of the entranceway are horizontal bar retainer clamps for locking the horizontal bars into place when the bullet-resistant curtain is in its deployed state. A vibration sensor control switch may be fixed on the perimeter of the entranceway and configured to activate vibration sensors fixed on the bullet-resistant curtain to detect vibrations and send notifications to remote authorities.