Patent ID: 9714534
Date: 2017-07-25
CPC Classifications: E05F,E05Y,F16K,Y10T

Claim:
1. A hydraulic overhead concealed door closer system comprising: a) a door frame defining a door opening, the door frame comprising a door frame width and a door frame top located above the door opening; b) a door comprising a door top and a door width, the door configured to pivot from a closed position in which the door covers the door opening, the door width is substantially parallel to the door frame width and the door top faces the door frame top, to an open position in which the door does not cover the door opening and in which the door width is not substantially parallel to the door frame width; and c) a hydraulic overhead concealed door closer located in the door frame top and comprising: wherein pivoting the door from the closed position to the open position is configured to cause the spindle to rotate about the spindle rotational axis and cause the piston to move within the cylinder at least partially along the cylinder length.