Patent ID: 8905113
Filing Date: 2014-12-09
Classification: E05D,E05F,E05Y,E06B

Abstract:
1. A door mechanism comprising: a rotatably mounted door shaft to operate a door, the door shaft rotating in a first direction in response to the door being raised, the door shaft rotating in a second direction in response to door being lowered, the door being biased to close; a drive sprocket fixed to the door shaft; a holding brake assembly to counter the closing bias of the door, the holding brake assembly comprising: a holding brake sprocket rotationally coupled to the drive sprocket; a freewheel coupled to the holding brake sprocket, the freewheel configured to provide free rotation of the holding brake sprocket in the first direction; and a first brake coupled to the holding brake sprocket via the freewheel, the first brake providing resistance to rotation of the holding brake sprocket in the second direction; a door release comprising: