Tamper resistant hinge assemblies

A bar lock comprising:

• a bar;
• first and second tamper resistant hinge assemblies, each hinge assembly comprising:
• a generally planar hinge plate having first and second ends, a pin-receiving portion disposed along the first end, the pin-receiving portion defining a passageway along the first end of the hinge plate, the hinge plate including a flat portion having a plurality of mounting holes formed therethrough;
• a generally planar pivot arm having first and second ends, a pin-receiving portion disposed along the first end, the pin receiving portion defining a passageway that is substantially coaxial with the passageway of the hinge plate, the second end of the pivot arm being arcuate in shape;
• a hinge pin disposed in the passageways to pivotally couple the pivot arm to the hinge plate;
• the pivot arm being pivotable between a closed position in which mating surfaces of the hinge plate and the pivot arm are substantially in contact with one another, and an open position in which the mating surfaces of the hinge plate and the pivot arm are not in contact with one another;
• the pivot arm including a domed portion forming a cavity positioned to overlie one of the mounting holes in the hinge plate when the pivot arm is in the closed position, the cavity being sized so as to provide clearance for a head of a mounting screw or bolt secured in the one of the mounting holes;
• a bar nested into and attached to the arcuate second ends of the pivot arms of the first and second hinge assemblies in a spaced apart configuration;
• and
• a handle coupled to the bar to rotate the bar to position the hinge assemblies in either of the closed position and the open position.