Patent ID: 8797830

Claim:
An explosion-proof system for generating airborne acoustic energy, comprising: a main housing including an open housing space and an opening; a cover structure configured for removable attachment to the main housing structure to cover the opening and provide an explosion-proof housing structure, the cover structure including an integral head mass having a front face, the cover structure and head mass forming a one-piece unitary structure having an inside surface and an outside surface from which the head mass protrudes, the explosion-proof housing structure configured to contain any explosive condition within the housing structure and prevent such condition from igniting an environment surrounding the housing structure; an acoustic energy generating assembly including a tail mass, an excitation assembly, and said head mass, said tail mass and said excitation assembly attached to the inside surface of the cover structure and configured to be disposed within said explosion-proof housing structure with the cover structure attached to the main housing, the head mass disposed outside the explosion-proof housing structure; a power source disposed within said explosion-proof housing structure; an electronic circuit disposed within said explosion-proof housing structure powered by the power source and electrically coupled to the excitation assembly, the electronic circuit configured to generate a drive signal for driving the excitation assembly to cause the acoustic energy emitting assembly to resonate and generate airborne acoustic energy from said front face of the integral head mass; the cover structure and the front face further characterized as being uninterrupted by any openings; and wherein the power source is a rechargeable battery, and the main housing includes a battery charging port for electrical connection to a battery charger in a charging mode, the battery charging port revealed by removal of a threaded plug which seals the port.