Movable or removable closures – Mounted for multidirectional or oblique movement – Swings on plural axes; e.g. – pivotal link arms
Patent
1986-09-19
1987-06-16
Downey, Kenneth
Movable or removable closures
Mounted for multidirectional or oblique movement
Swings on plural axes; e.g., pivotal link arms
49334, E05D 1528
Patent
active
046727728
ABSTRACT:
A balanced door operating mechanism comprising a floor sheave, a door sheave, an arm extending between the wheels, and a cable rotatably coupling the wheels. The floor sheave is fastened substantially adjacent a side jamb of the door frame between the threshold and the door, and is oriented with the axis of rotation thereof parallel to the axis of rotation of the door. The door sheave is fastened to the door coplanar with the floor sheave so that the axis of rotation of the door sheave is inset medially from and oriented parallel to the axis of the floor sheave. The substantially rigid arm is pivotably mounted at a proximal end on the floor sheave, and at a distal end on the door sheave, and carries at least part of the weight of the door. The cable frictionally engages peripheral grooves in the floor sheave and the door sheave, and extends between peripheral points of the sheaves which are closer to one face of the door than to the other. A coil type spring biases the door toward a normally closed position.
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Downey Kenneth
Graybeal John O.
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