I ve designed what i believe to be a more simple method of creating a self locking chicken coop sliding door.
Making a sliding chicken coop door.
As it shifts to a lighter weight the door closes.
Build a cheap movable chicken coop.
When the door is closed it sits behind the board on the bottom to thwart raccoons and other small predators.
The chicken tractor door frame is finished.
There are no nails used in this chicken coop project.
Place where the sliding door of the chicken tractor is inserted.
Attach the front doors.
The idea is to use the combined weight of the chickens as they climb onto the roosting bar to sleep at night to pull the cables and pulleys and pop the door open.
Note that you may need a third hinge directly in the middle depending on how tall your chicken coop is.
The mobile hen house door frame is made with the same boards as the structure.
The cord pulls the door up or lowers it.
Screw in two hinges per door one about four inches from the top of the door and the other about four inches from the bottom.
You can also make a diy automatic chicken coop door and instead of using electricity or batteries use the chickens themselves.