Quadrangle flexible hinge

FIG. 1 is a perspective view of a quadrangle flexible hinge showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is an enlarged view of area 8 shown in FIG. 2 ;

FIG. 9 is an enlarged view of area 9 shown in FIG. 3 ;

FIG. 10 is an enlarged view of area 10 shown in FIG. 4 ; and,

FIG. 11 is an enlarged view of area 11 shown in FIG. 5 .

The dash lines encircling the areas of enlargement form no part of the claimed design.