Trigger-type liquid dispenser

摘要

A spring member (6) is made of synthetic resin, and comprises a base plate (12) and a pair of spring pieces (29) for returning the plunger (5). Each of said spring pieces (29) comprises a main plate spring (32), a second plate spring (33) and a lower end (30). Said main plate spring (32) is positioned at plunger side, and has a schematically arcuate longitudinal section. Said second plate spring (33) is positioned at nozzle head side, and has a longitudinal section constituting a substantially constant-load plate spring. Said main plate spring (32) and said second plate spring (33) are connected each other at an upper end and a lower end (30) thereof. A locus of elastic deformation of the main plate spring (32) substantially coincides with an arc locus (Y, Z) including a tangent line (X) in an upper surface of the base plate (12).