| 摘要 |
<p>A dispensing pump for liquid or pasty products comprising a housing (2), a piston (6) arranged to move telescopically within the housing between rest and activated positions and a plastics spring (9) arranged to return the piston from its activated to its rest position. The plastics spring has a folded, concertina configuration to provide the required return force for the piston. The spring also has end plates (91, 92), which can be adapted increased functionality. The whole pump may be moulded from a plastics material and has few component parts.</p> |
