A tire pump comprises a first cylindrical body, a second cylindrical body, a two-way air admission piston, a piston rod, a first one-way valve, a hand grip, a second one-way valve, a third one-way valve, a fourth one-way valve, and an air valve connection head. The second cylindrical body is fitted to...http://www.google.es/patents/US5165876?utm_source=gb-gplus-sharePatente US5165876 - Tire pump
