Marveille Door Handles September 23rd, 2017 - 05:24:09
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.
Also when it comes to fitting a lock to a door you will need to decide whether you are going to have a separate handle and lock, or a fitting that combines both. It may well be that like most people you do not need locks fitted to every door, however if you do need some doors to be fitted with locks, on storage cupboards as an example, and want to use handles fitted with integrated locks in them then make sure they are available in the range of handles you are considering buying.
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.
Depending on the website or the shop you are browsing through you may find the categories differ slightly but generally speaking with door handles you have a choice from Designer Door Levers on Round Rose, Designer Door Levers on Square Rose, Designer Handles on Backplate, Classic Handles, Stainless Steel Handles, Handles for Doors with Espagnolette Multipoint Locking Systems, Porcelain Door Levers on Rose, Porcelain Handles on Backplate, Black Antique Handles, and Aluminium Handles. Within each of these categories you will an array of individual door handles to choose from.