Marveille. Door Handles. October 04th , 2017.
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. Depictions of door handles in paintings dating to the first century CE are centrally placed hinged rings. The modern door knocker is a vestige of this style of primitive door handle. Doors were typically secured by bars and brackets to prevent them from being opened by either intent or accident.
There are two types of handles, when it comes to general use: external or outdoor handles which are utilized on all main entrances to the home, be it front door, back door, side door or service door; and internal handles which are used for the doors inside the house such as bedroom doors and toilet doors. One of the most popular broad types of external door handles is the lever type, which is commonly used in European homes. External latches are normally bigger as they frequently come with key-in locks for security, and are called lever lock handles. Indoor handles (or lever latch handles) are smaller, as they come without locks, and key-in locks are normally installed separately on the door. There are also external handles with combined door knockers, a very practical alternative when your electric door buzzer is out of order.
The other important aspect to consider when buying door handles is the aesthetic beauty. There are artistic knobs that may take diverse shapes such as a hand, bottle or a key. Some handles are placed at the center of the door for aesthetics. You can also get a see through knobs or a old fashioned ones. The door knobs also come in diverse colors to match with the door furniture and the rest of the house.
While different types of door handles are designed with unique components, the average handle has basic components. For instance, in addition to the knob top, which is the large knob that you would actually grab hold of to turn, handles are made with a spindle, shank, and knob rose. The knob rose is a round washer or plate used to form a socket. This piece is adapted so it can be attached to the actual door. Then, there is that spindle, which is the thin piece to which the handle attaches. The shank is the stem that projects from the door handle. Within the shank is a hole in which the spindle would be placed. For functionality, the door handle would be attached so the metal shaft can turn the latch to open the door.
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.
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