This invention relates to sustained release preparations of insulin comprising polyamino acid particles, insulin and one or more preservative agents, and a method of preparing such preparations. The hinge assembly supports the drop down door with practically no deflection of the door or hinge assembly when normal loads are applied to the open door, but allows the door to drop from the horizontal when excessive loads are applied to the door, to preclude the tipping of an appliance to which the door is attached or the continued use of the door as a platform. The system type of a system containing the inputoutput interconnect ports is detected.