Torque rod operated counterbalancing hinge and door assembly
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United States of America Patent
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-
Oct 17, 1989
Grant Date -
N/A
app pub date -
Oct 27, 1988
filing date -
Oct 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A torque rod operated counterbalancing hinge comprising first and second hinge members connected together at a hinge point, the second hinge member being curved with a cam surface to the first hinge member, and the other end rotatable relative to a pivot point located at a position displaced from the location of the hinge point. A lever arm has one end rotatably mounted at the pivot point and the other end has a bearing surface for contacting the cam surface. The rotating end of the torque rod is fixed relative to the lever arm whereby rotational hinge motion of the first hinge member relative to the second hinge member causes the cam surface to press upon the bearing surface through a moving contact point which rotates the lever arm to produce a counterbalancing twisting of the torque rod. The invention also includes a door assembly employing the counterbalancing hinges.
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