| 摘要 |
<p>Hand-operated duplex pump for wheels with pneumatic tires, especially bicycle or scooter wheels, comprises a nipple head (1), a moving pump housing (2) with cylinder chambers, and a hollow piston rod (3) in the nipple head. The piston rod has on its free end a piston (5) that is displaced in the same movement direction between two stops (4, 6) by pressure on moving the pump housing. On each movement of the piston one of the two air bores (7, 8) in the piston rod between the stops closes and the other air bore opens so that the compressed air is alternately discharged from one compressed cylinder chamber through the air bore that is open via the hollow piston rod to the nipple.</p> |
