Patent ID: 6021606
Filing Date: 2000-02-08
Classification: E02D,E04D,E05F,E05Y,Y10T

Abstract:
A horizontal door assembly with counter balancing spring means comprising:a door having an upper surface and a lower surface and hingedly mounted to a frame at a hinge point for motion between an open and closed position;a latch and a mating catch to enable the door to be maintained in a closed position;a counter balancing mechanism comprising an upper cylindrical member and a lower cylindrical member which members are sealed at the ends and which slide together about an internal spring, the upper member having at its upper end an ear with an upper surface and with a slot opening therein in an axis substantially along the longitudinal axis of the cylindrical members and being pivotally supported to the door at the slot and the lower member being pivotally supported to the frame at its lower end;a bracket attached to the lower surface of the door and having an opening therein;a pivot pin extending through the slot in the ear in the upper cylindrical member and the opening in the bracket to effect the pivotal movement of the upper cylindrical member of the counter balancing mechanism during opening and closing of the door;wherein when the door is in the closed position, the upper surface of the ear is in contact with the lower surface of the door and the pin extending through the slot is in a position intermediate the length of the slot.