Patent ID: 7086441

Claim:
A hydraulic governor device for use with a rotational shaft of a door assembly for controlling a rotation of said rotational shaft, the device comprising: a sleeve having first and second opposite ends, the sleeve comprising a chamber, and a tube being separate from said chamber; first and second end coverings each being provided with a recess shaped and sized to cooperate with the tube and the chamber, the first and second end coverings being mounted respectively onto the first and second ends of the sleeve so as to define a hydraulic flow path from one end of the chamber to another end of the chamber, said hydraulic flow path extending through the recess of the first end covering, the tube, and the recess of the second end covering; a fluid substantially filling the hydraulic flow path and being able to travel along said path; an input shaft extending through the ends coverings and the chamber, the input shaft being operatively connected to the rotational shaft of the door assembly so as to rotate with the same; a first piston disk positioned inside the chamber and mounted about the input shaft, the first piston disk being slidably movable along the input shaft; a second piston disk positioned inside the chamber and mounted about the input shaft, the second piston disk being slidably movable along the input shaft and being further connected to the first piston disk with spacer rods so as to slide in accordance with the first piston disk along the input shaft; and a reciprocating assembly operatively connected between the input shaft and the piston disks and cooperating with the same for converting a rotation of the input shaft into a reciprocating movement of the pistons disks within the chamber, so that said reciprocating movement of the pistons disks inside the chamber causes in turn the fluid to travel along a reciprocating movement along the hydraulic flow path, said reciprocating movement of the fluid along the hydraulic flow path causing a damping effect of the rotation of the input shaft and thus controlling the rotation of the rotational shaft of the door assembly via a damping effect.