Improvements in and relating to doors

摘要

The present invention relates to an improvement to roller shutter doors comprising a curtain of linked slats operating between channels at the side of the door opening in a plane of opening between a retracted position allowing access and a deployed position closing such access. It is an advantage of the present invention that it allows for ready detection when the door encounters an obstacle while allowing for the construction of a robust and durable weather strip. In a first aspect a roller shutter door assembly comprises a central control unit (6), a motor (8) actuable by the central control unit to drive a roller (4), and a roller shutter curtain (2) connected to the roller and comprising a plurality of interlocking slats including at least a first slat and an adjacent second slat, each of the plurality of slats having a degree of play therebetween and being connected for pivoting movement therebetween, guide means (10) to each side of the curtain to guide the movement of the curtain, and signal means (52), in which the roller shutter door assembly further comprises a detection means (20) such that a predetermined relative vertical displacement between the first slat and the second slat will cause the detection means to actuate the signal means to send a signal to the central control unit (6), the central control unit then operating to stop the motor (8). In a second aspect the invention comprises a detection means (20,120) for fitting to a roller shutter door comprises a switch assembly itself comprising a signalling means (50,150), an actuating lever (26,126) and a return means.