Counterbalanced door assembly with reduced initial closing force
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United States of America Patent
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-
Apr 27, 1993
Grant Date -
N/A
app pub date -
Oct 1, 1992
filing date -
Oct 1, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A door closing mechanism, preferably mounted on a counterbalanced door assembly, which provides a mechanical advantage to close the door and overcome the forces of friction, inertia and any counterbalancing forces. A slot plate with a curved control slot is mounted to the door. A control arm, pivotally mounted at one end to the door frame, has a handle and slot engager mounted at the other end. The slot engager slides along the control slot and pulls the door closed as the handle is pulled. The control slot is preferably curved only along a first portion and straight in a second portion to provide greater mechanical advantage at the beginning of its motion.
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