The most basic of doorknobs is simply a protrusion on a door which provides a place for a hand to grab in order to pull the door towards you. However, most households prefer to use doorknobs which incorporate a mechanism which ensures the door remains closed until the mechanism is activated.
Doorknobs with this mechanism in work by use of a latch which extends from within the door into a recess in the frame This ensures that the door cannot be pulled open or perhaps blown open by a draft, but that the knob must be turned in order for the mechanism to work. The turning of the knob causes the latch to withdraw into the door itself, removing the blockage between the door and the frame and allowing the door to be opened. It is possible for knobs such as these to also incorporate a lock into them, which works by preventing the action of turning the handle. Generally these are in the form of a button in the centre of the knob which must be pushed in, or twisted depending on the style of knob, and which then stops the handle form being able to be turned. This is the simplest form of lock and can be useful in rooms such as bathrooms as they are simple to operate and means an...
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