Patent ID: 6684931
Filing Date: 2004-02-03
Classification: E05D,E05Y

Abstract:
A counter weight door comprising:two guides each arranged to be located on a respective sides of an opening on a building; a door which is arranged to be supported on respective side thereon by the guides, the door having a plurality of panels each connected to the next one of the panels for common movement vertically in the guides; a counter weight system coupled to the door for providing counter weight for the weight of the door, the counter weight system having a plurality of counter weights each associated with a respective one of the panels; the counter weights being arranged vertically one above the next in a row; an interconnecting coupling connecting each of the counter weights to the next and arranged such that a bottom surface of each of the counter weights is spaced from a top surface of the next when the weight of the door is supported by the counter weights and such that the bottom surface of each is stacked on top of the top surface the next so as to be supported by the next as the door is moved to a position so that is not required to be supported by the counter weights; at least one of the counter weights comprising a base plate and side walls defining a cradle for receiving a plurality of individual weight members resting thereon such that the weight of said at least one counter weights can be adjusted by selecting a required number of the weight members.