US Patent 9194166 Modified door hinge comprising locking mechanism

Some implementations provide a hinge that includes a first wing, a second wing, a coupling pin, and a locking pin. The first wing includes a first knuckle and a second knuckle. The first knuckle includes a first hole. The second knuckle includes a second hole and a first locking hole. The second wing includes a third knuckle and a fourth knuckle. The third knuckle includes a third hole. The fourth knuckle includes a fourth hole. The coupling pin is configured to couple the first wing to the second wing through the first, second, third and fourth knuckles. The locking pin configured to limit the hinge in a particular position when the locking pin is inserted into the first locking hole of the second knuckle. The locking pin configured to lock the hinge in a particular position when the locking pin is inserted into the locking hole of the second knuckle.