A manually-operated device for safely inflating automotive vehicle tires. A pressurized gas cylinder is connected to a manual valve for delivery of pressurized gas to a vehicle tire. The gas pressure is safely controlled (regulated) by a stepped piston that is slidably arranged in a vent chamber. A small...http://www.google.es/patents/US4969493?utm_source=gb-gplus-sharePatente US4969493 - Supplementary tire inflator
