The interior swinging kitchen doors are using the floor mounted hinges. This type of hinge is using the system of spring tension. The spring system enables the door to swing out and into the room. The door will automatically return to closed position when it is pushed open. They are not often used for the kitchen doors or any other doors in the house, at least not as commonly as the regular open close door.
The interior swinging kitchen doors have their own advantages. It may not be a space saving door like the sliding door, but certainly they do not to have any knobs installed or any other devices to help you open and close the door when trying to enter the kitchen. Even though the swinging door is not as often used at homes, but when they are, they would be used at the doorway between the living room and the kitchen. Some other homeowners place it at the kitchen pantry so that the access to this area would be easier. After all, most of us leave the area with ingredients at our hands.
The interior swinging kitchen doors are used mainly for the houses which often entertain or do not have any space for dining room at the kitchens. The swinging door is similarly used for this area so that the people who are serving the food would not have to use the handles to open and close the door. Imagine how difficult it would be to have food on both hands and still have to turn the knob.
The hinges used for the interior swinging kitchen doors may vary. The ones being used at the residential doors would be the ball bearing system. The hinges look square. They are made of different materials and sizes. The most common materials would be brass and stainless steel.