[sumit patni]

A movable joint used to attach, support, and turn a door (or cover) about a pivot; consists of two plates joined together by a pin which support the door and connect it to its frame, enabling it to swing open or closed.

Types of hinges :
Double action hinge,
butterfly hinge,
butt hinge,
dovetail hinge,
gravity hinge,
H-hinge,
HL-hinge,
pintle hinge,
side hinge,
strap hinge.



Gravity Hinge - A hinge that closes automatically as a result of the weight of a door to which it is attached.



HL hinge - A type of H-hinge that has a horizontal extension added to a foot of the hinge..

Pintle Hinge - A hinge that pivots about an upright pin or bolt.

Strap Hinge - A hinge fastened to a door and the adjacent wall by a long hinge.



Concealed hinge - Used for furniture doors (with or without self-closing feature, and with or without damping systems). They are made of two parts: One part is the hinge cup and the arm, the other part is the mounting plate.


Hinges

Steel is a favorite for hinges of all types. It is relatively cheap, strong, and durable. Its evolution from outcast to ordinary.

There are many steel alloys, but one in particular bears notice when it comes to hinges: stainless steel. This steel is composed of at least 10.5 chromium, which reacts with oxygen in the air to form a very thin film of chromium oxide on the surface of the steel.

The discovery of this corrosion-proof metal is generally credited to Harry Brearley, Both brass and bronze are alloys of copper, which is one of the very first alloy humans were able to master.

Brass, a mix of copper and zinc, was known to early civilizations, but did not enjoy the popularity of its bronze cousin largely because it was more difficult to produce. The Romans used it to a limited extent in coins and jewelry, but brass was not widely used until about the seventeenth century, when European woolmakers used brass pins in weaving. Brass has become even more popular since technology to reliably mass-produce it was introduced in the nineteenth century