US Patent 7137152 Bird-cap assembly

The combination comprising a figure element mounted on the bill of a cap. The figure element includes a removable compartment and the mounting means comprises an elongated threaded screw member having an enlarged head at one end engageable through a hole in the bill. A washer is disposed between the screw head and the bill. An enlarged tapered flexible ring is mounted between the outer surface of the bill and the bottom compartment. A lock washer threads on the shank of the screw remote from the head end. The flexible ring permits limited turning of the compartment when the screw is turned to a locked position to facilitate assembly and disassembly of the compartment from the figure element.