Counterbalance mechanism for bottom-hinged aircraft fuselage doors
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United States of America Patent
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May 19, 2015
Grant Date -
May 22, 2014
app pub date -
Nov 20, 2012
filing date -
Nov 20, 2012
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Abstract
A counterbalance mechanism for counterbalancing weight of a bottom-hinged door (such as a clamshell-type airstair door of an aircraft) includes an operator handle, a hoist rod pivotally connected at one end to the operator handle and at an opposite end thereof to the door near a bottom region thereof. A force accumulator assembly is provided which includes a force biasing member which accumulates and dissipates a bias force when opening and closing the door, respectively, to provide mechanical counterbalance to the weight of the door. A bellcrank assembly operatively connects the operator handle to the force accumulator. In such a manner, weight counterbalancing of the door is achieved.
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