Everyone's missing the real issue. Springs, motors, or pneumatics don't matter if there's something in the way preventing it from closing. A cheap fridge on an uneven floor will close the door itself if there's nothing in the way, but if the jug of milk is hanging off the edge of the shelf with no room behind it, the door isn't closing without something getting damaged.
Additionally I might want it open for an extended period of time, such as loading or unloading a lot of items
Or, you know, a cat or child climbed in and the door closed on them…
Doors can have a notch in the hinge (like a car door) so that once it opens far enough it will stay open until pulled.
The doors at my work (that close due to springs) also have that notch.
Everyone's missing the real issue. Springs, motors, or pneumatics don't matter if there's something in the way preventing it from closing. A cheap fridge on an uneven floor will close the door itself if there's nothing in the way, but if the jug of milk is hanging off the edge of the shelf with no room behind it, the door isn't closing without something getting damaged.
Additionally I might want it open for an extended period of time, such as loading or unloading a lot of items
Or, you know, a cat or child climbed in and the door closed on them…
Doors can have a notch in the hinge (like a car door) so that once it opens far enough it will stay open until pulled.
The doors at my work (that close due to springs) also have that notch.