Lifting mechanism for horizontal hinged doors
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 8, 2000
Grant Date -
N/A
app pub date -
Oct 1, 1998
filing date -
Oct 1, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A horizontal door assembly is provided with pivotal counter balancing spring comprising an upper cylinder and a mating lower cylinder to force the cover of the door to an open position when the door assembly is unlocked wherein the upper cylinder of the counter balancing spring is configured to reduce the forces of the spring on the pivot points of the counter balancing mechanism thereby increasing the life of the counter balancing mechanism. In a preferred embodiment, the counter balancing spring mechanism is made of plastic and has an ear at the upper end thereof with an elongated slot opening the slot having a longitudinal axis substantially parallel to the longitudinal axis of the cylinder for mating with a pin inserted in an opening in a yoke bracket attached to the lower side of the cover. When the cover is in the closed position, the bottom of the cover rests on the upper surface of the ear and the pivot pin is positioned intermediate the elongated slot opening thus reducing the spring forces on both the pivot point of the counter balancing spring mechanism and on the spring mechanism.
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