shown from a closed toward an open position when the door is unlatched with reference now to fig8 9 in a fourth embodiment of hinge assembly 10 one or more coil springs 48 having spring arms 47 49 are disposed on axle 40 between a hinge cylinder 29 of door rail 12 and an adjacent hinge cylinder 39 of housing rail 16 one or both of the hinge cylinders 29 39 is adapted to accommodate in a space between adjacent hinge cylinders one or more coil springs 48 one coil spring arm 47 is disposed in contact with housing rail body side wall 34 the other coil spring arm 49 is disposed to come into contact with door rail 12 to cause coil spring 48 to be deformed by door rail 12 when a main door 42 44 is rotated toward a closed position to cover a predetermined portion of front opening 32 of housing 20 thus each main door 42 44 is urged by the energy stored in one or more of deformed coil springs 48 from a closed toward an open position when the door is unlatched as will now be apparent to one having ordinary skill in the art each embodiment of the present invention discussed above presents only a smoothly rounded housing corner with no openings or gaps for insertion of a tool when each main door 42 44 is in a closed position covering a.