(57) 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.
|
|
