| 摘要 |
A manually-actuated fluid dispenser pump including a pump body (10) and a piston (50) mounted to slide in leaktight manner in the pump body (10) between a rest position and a dispensing position, the piston (50) being provided with at least a bottom sealing lip (51) in leaktight contact with the pump body (10), the pump body (10) being provided with an inwardly-extending radial shoulder (11) co-operating with the bottom lip (51) of the piston (50) to form an abutment for the piston (50), and to define its dispensing position, the pump being characterized in that the pump body (10) is provided with an axial annular setback (15) at the radial shoulder (11) so that the active sealing portion (53) of the bottom lip (51) makes no contact with the radial shoulder (11) when the piston (50) is in its dispensing position, so that no axial force is exerted on the active portion (53).
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