| 摘要 |
<p>The invention relates to a manually actuated distribution pump for a liquid product, said pump comprising a housing (10) and a piston (50) which slides in a sealed manner inside said housing (10), between a normal position and a distribution position. Said piston (50) comprises at least one lower sealing lip (51) which is in contact with the pump housing (10) in a sealed manner, and the pump housing (10) has a shoulder which extends radially inwards (11) and co-operates with the lower sealing lip (51) of the piston (50) in order to form an abutment for the piston (50) and to define its distribution position. The inventive distribution pump (10) is characterised in that the pump housing comprises an axial annular cut-away part (15) in the region of the radial shoulder (11), which causes the active sealing part (53) of the lower lip (51) to be at a distance from the radial shoulder (11) in the distribution position of the piston (50), such that no axial force is exerted on said external part (53).</p> |
