Doorknobs have been made of many materials including wood ceramic glass plastic and different types of metal.
Materials used in door handle.
By pulling the string the homeowner could lock the door from the outside.
Door handles have been in existence for at least 5000 years and its design has evolved since with more advanced mechanism types and designs made.
Examples include brass white porcelain brown mineral cut glass wood and victorian bronze.
The average doorknob is 2 25 in 5 715 cm in diameter.
While brass remains the most common type of metal used for door knobs stainless steel and plastic have grown increasingly popular and cheaper as a material choice and that may be bad news for cutting back on the spread of germs.
Which one is best depends on your specific needs and.
Some door handles are arm or foot operated to reduce transmission of contagious illnesses.
This used a latchstring to pull a bolt through brackets in the door.
As a material for door handles stainless steel is thus best applied to heavily used doors particularly those in public buildings such as the public authorities hospitals on ships in motorway.
It can be plain white cream or black or combined with gold lines or brass chrome and bronze fittings.
Although not as popular porcelain door handles are available in many different colours.
The greeks developed a simple door lock by about 700 b c.
Then the string was stuffed back through the keyhole.
You can go as basic as a flat door or as ornate as panel doors with detailed carvings.
The key itself was a sickle shaped piece of metal from two to three feet long.
A combination of several materials is sometimes used but the three basic material choices for exterior doors are wood steel and fiberglass.
Wood doors are primarily used for interior door applications.
Door handles can be made out of a wide variety of materials.
Porcelain is mainly used for internal door knobs and is a very practical and low maintenance material.