Convertible ladder

An adjustable hinge mechanism comprising:

• a first hinge plate having a first pivot aperture and at least one pair of first positioning apertures formed therein;
• a second hinge plate having a second pivot aperture and at least one pair of second positioning apertures formed therein;
• a hinge shaft having a first section and a second section, wherein the second section has a diameter that is smaller than the first section to define a shaft shoulder;
• a hub extending through the first and second pivot apertures to pivotally attach the first hinge plate to the second hinge plate, wherein the hub has a bore extending there through, wherein the bore has a diameter that is approximately the same as the first section, wherein the hub further has an end plate with an aperture formed thereon, wherein the end plate aperture is approximately the same as the second section;
• a spring extending over the second section between the shaft shoulder and the end plate, wherein the spring biases the hinge shaft away from the end plate;
• a first handle having a pair of locking pins extending therefrom, wherein the first handle is attached to the second section of the hinge shaft, wherein the locking pins are extendible through the first and second positioning apertures to retain the first and second hinge plates in a stationary relationship;
• a second handle attached to the hinge shaft opposite the first handle, wherein the second handle facilitates urging the locking handle from an engaged position where the locking pins extend into the positioning apertures to a disengaged position where the locking pins do not extend into both the first and second positioning apertures;
• and
• an engagement indicator, wherein the engagement indicator is visible when the adjustable hinge mechanism is in the disengage position and wherein the engagement indicator is not visible when the adjustable hinge mechanism is in the engaged position.