Patent ID: 6267271
Filing Date: 2001-07-31
Classification: B05B

Abstract:
A trigger-type liquid dispenser comprising an injector body (1) having an inverted L-shaped side shape, a nozzle head (2) mounted at a front end of the injector body (1), a trigger (3) hinged at a front portion of the injector body (1), a pump mechanism (4) in the injector body (1), said pump mechanism (4) including a plunger (5), and a spring member (6), characterized in thatthe 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 nozzle head side, and has a schematically arcuate longitudinal section,said second plate spring (33) is positioned at plunger 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, anda 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).