Door Knobs are the round types of door handles that are gripped by the user to open or close a door. Door Knobs are one of the most common types of door handles. Door Knobs can be used in various indoor and exterior doors as well as multiple building types. Door Knobs embrace different designs ranging from decorative to minimal silhouettes. Door Knobs are mostly made of metals including copper, zinc, brass, steel, and even sometimes wood or porcelain. The different types of Door Knobs include the keyed door knob, passage door knob, privacy door knob, and dummy door knob.
Door knobs are not considered accessible as they require grasping and twisting to operate, which can be difficult for people with limited hand mobility. Lever handles are considered more accessible as they can be operated with a closed fist or by using the side of the hand, making them easier for people with disabilities to use.
Door knobs that cannot turn are called Dummy knobs or Fixed knobs, they are used for doors that do not need to be locked or where a push-pull function is required such as on a closet door. They are attached to the door surface and do not have any mechanism for latching or locking.
British door knobs are often placed in the center of the door because it is considered the traditional location for door knobs in the UK. This is because in older homes, door knobs were placed in the center of the door to make them easily accessible for people who were standing or sitting in a room, and also because it was a way to make the door knob symmetrical to the door itself. Additionally, this tradition was carried on from older architectural styles, such as Georgian and Victorian styles.