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 View the rest of this article
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