Hydraulic door construction

A door arrangement for a building comprising a door, a door frame including a pair of vertical door posts, means mounting the door on the door frame for pivotal movement about a horizontal axis adjacent the top of the posts from a closed position in which a plane of the door lies in the same plane as the posts to an open position in which the door extends outwardly from the horizontal axis, the door being formed in the first and a second part, the first part being mounted on the door frame at said horizontal axis for pivotal movement about said horizontal axis and the second being mounted on the first part and foldable relative thereto about a second axis parallel to said horizontal axis, the second part in the open position of the door being arranged such that it is folded under the first part so as to lie directly parallel thereto, and including a first and a second lever mechanism extending between said first part of the door and the second part of the door and arranged to cause movement of the second part of the door into the folded position in dependence upon pivotal movement of said first part about said horizontal axis, first and second coupling means each fixedly mounted on the first part of the door at a respective side thereof at a position projection outwardly from the plane of the door, and first and second extendable hydraulic cam means, means connecting one end of each ram means to a base of a responsive one of the posts to communicate force from the door solely to the base, means connecting an opposed end of each ram means to a respective one of the coupling means, the ram means being extendable from a first position in which the door is closed to a second position raising the door to the open position.