Step plate mechanism for door opening and closing device
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United States of America Patent
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Sep 20, 2016
Grant Date -
Oct 23, 2014
app pub date -
May 11, 2012
filing date -
May 11, 2011
priority date (Note) -
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Abstract
A step-plate mechanism is provided for a door-opening/closing device that is powered by the downward movement of a step plate caused by a stepping force of a pedestrian, with the step plate being disposed on a floor at both the front and back of a door as seen by a pedestrian, including a return mechanism is provided to bias the step plate, which moves downward by the stepping force of the pedestrian, to return to its original position after the pedestrian passes.
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