A switch mechanism is provided that has a tubular enclosure; a contact pin electrically insulated from the tubular enclosure; a g-weight positioned inside the tubular enclosure and movable from an open position to a closed position; and a transparent closure that encloses one end of the tubular enclosure....http://www.google.com/patents/US7320286?utm_source=gb-gplus-sharePatent US7320286 - Setback switch for safe and arm
