Opening a Door
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This is a model of a door-opening mechanism. The wings of the door are held by horizontal arms that are rotated by vertical shafts. The shafts are driven by devices (e.g., an electric motor) installed in the suspended ceiling.
Contributed by: Sándor Kabai (February 2008)
Open content licensed under CC BY-NC-SA
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"Opening a Door"
http://demonstrations.wolfram.com/OpeningADoor/
Wolfram Demonstrations Project
Published: February 12 2008