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Classroom door hinge lock.
The doors are equipped with a one side locking mechanism.
An iowa teacher invents a school door lock which is designed to be installed in seconds to keep dangerous intruders out of classrooms.
That makes sense but the problem is that most classroom doors are only lockable from the outside.
Schools built this way made sense originally because you would only need to lock the door two times a day.
We re here mon fri 9 5 mtn time.
Many doors that do not have hardware that allows teachers to lock it from inside the classroom can be locked by turning a thumb turn or by pushing a button on the door.
Kwqc s tiffany liou reports.
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