Patent ID: 6061965
Filing Date: 2000-05-16
Classification: E05F,E05Y

Abstract:
A door operator system, comprising:an expandable and retractable lattice assembly adapted for connection between a door and a stationary structure, said lattice assembly having a first pair of link arms pivotally connected together at a first middle pivot joint and at least a second pair of link arms pivotally connected together at a second middle pivot joint, the first pair of link arms being pivotally connected to the second pair of link arms at upper and lower pivot joints, such that the distance between a retracted position and an expanded position of said lattice assembly is relatively long; andan actuator having a first portion that is reciprocal with respect to a second portion between a first position and a second position, the distance between the first and second positions being relatively short, said first portion being operably connected to said lattice assembly at a first location and said second portion being connected to said lattice assembly at a second location spaced from the first location for expanding and contracting said lattice assembly;wherein first and second locations move during expanding and contracting of said lattice assembly;wherein movement of said first portion of said actuator between said first and second positions over said relatively short distance causes said lattice assembly to move between said retracted and expanded positions over said relatively long distance, thereby causing movement of the door with respect to the stationary structure over said relatively long distance when said lattice assembly is connected between the door and the stationary structure.