Door Handles. Thursday , September 13th , 2018 - 01:05:01 AM
Door handle is an ambiguous term, and includes door latches, bars, and knobs. Depending on the geographical location and its place in time, they vary in design, form and materials. The only constant is its function: an attachment used to open or close a door. The earliest doors extant are approximately 5000 years old. Door handles, as devices to manipulate a gateway, became a necessity shortly after the invention of the pivoting mechanism. To most, pivots are simply known as hinges, however, there are nearly as many hinge designs and configurations as there are handles. The simplest handle is a pull - or push - projection on the side opposite the hinge. The placement of the handle is generally where it will provide an optimal mechanical advantage; most doors operating as second class levers. Doors with centre pulls or rings, or a pivot point in a location other than one edge of the door, use first or third class lever principles.
When you consider that some 120 million doorways exist in the United States alone and another two million are installed each year, you can only imagine the vast number of door knobs. Going back in history, doors were initially made from textiles and animal hides. However, during the ancient Mesopotamia and Egyptian era, wooden doors were developed. Soon, materials for making doors expanded to include stone, glass, metal, and even paper. Doors throughout history have also changed regarding functionality. For instance, we still find doors of all types, those that roll, slide, swing, and fold. Of course, for doors to function, hardware is required to include door handles. Just as with doors, handles have a long history although these were first manufactured during the mid-19th century in America. The first handle was shaped like an egg and today, they are still found in many homes, especially older homes. Interestingly, because of the way this type of door handle is grasped, it has proved to be the easiest to open.
The entrance door handles are usually used for the doors furniture that lead to the outside of the house. The knobs come with a locking mechanism for security. The privacy knob locks will usually not come with a cylinder locking system. The security features are not major since the main aim of the door furniture is to enable privacy as opposed to security. Closet door knobs on the other hand do not have a locking system. They are used on hall ways and for closets door furniture. The knobs are used for pulling and returning the door. Dummy handles are used more for aesthetic beauty as opposed to functionality. Such handles are placed on electric doors, ball catch doors or spin doors.
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