In a gas internal combustion type nailing machine, a tubular-shaped sleeve is fixed between a movable housing and a fan. Between the movable housing and sleeve, an annular space portion is formed. In such portions of the sleeve as existing respectively upwardly and downwardly of the fan, there are formed...http://www.google.es/patents/US8113403?utm_source=gb-gplus-sharePatente US8113403 - Gas internal combustion type nailing machine
