Abstract: The present invention provides a portable, motor driven air purifying instrument for purging impurities from the atmosphere about the user, i.e., from a more or less localized or confined body of air such as that in a room or in an automobile. It is designed to be used as a personal adjunct for purifying the atmosphere or body of air about a person with whom it is associated. It is designed for use indoors, i.e., in an enclosed or limited space.

Abstract: The present invention provides a compact, completely enclosed motor driven spark plug cleaner. It is preferably battery driven and is adapted to be held in the hand of the user. The invention provides a device for projecting granular abrasive against the electrodes and the insulation of a spark plug to clean them of carbon deposit. Safety features prevent projection of the abrasive particles into the face and particularly the eyes of the operator. Spark plugs of various sizes and screw threads may be treated without requiring any structural adjustments by the operator. The blast of abrasive particles is directed against the electrodes or "points" of the spark plug at an angle to the longitudinal axis of the plug, and the plug can be rotated and wobbled in its mount. This provides a novel and advantageous mode of operation and constitutes a novel method of cleaning a spark plug.