| A spring hinge actuated by torsion springs has torque factors, requiring
accurate evaluation of the pressures, degrees of travel, frequency of use,
projected life expectancy, atmospheric conditions, and other conditions
which may affect its operation.
This type of hinge reaches its maximum tension at a given point and maintains this pressure (except for slight spring set) during it cycling term. Spring hinges. loaded to the open position, have a free position (in which the spring is relaxed) and the degree where full pressure is reached. As shown: 
Generally, a hinge, spring loaded to the closed position, is under tension
in all degrees of travel. A hinge of this type may have embossed leaves
to allow the spring legs freedom of movement in any method of attachment,
as shown below:
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