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Question:

What keeps a automatic door opener closed?

Ok, so I'm trying to figure out what exactley keeps a door opener closed.Why? I was helping my grandparents and discovered that a little tug and the door opens by itself.. bably the antique door openers...but it made me wonder, are new ones much better?

Answer:

they are held by motor that has been locked kinda,what happens is when the door gets to the end of the cycle that is programed into it,the motor stops in a locked position until the door opener is hit again then it runs through its cycle again,only in the oposite position

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