| 摘要 |
<p>A synthetic resin-made return spring (6) of a trigger (3), comprising a substrate (12) and a pair of spring pieces (29) for returning a plunger (5), wherein each of the spring pieces (29) further comprises a main leaf spring (32), an auxiliary leaf spring (33), and a lower end (30), the main leaf spring (32) is disposed on the plunger side and has a longitudinal cross section of generally arc shape, the auxiliary leaf spring (33) is disposed on the nozzle head side and has a longitudinal cross section constituting a generally constant load leaf spring, the main leaf spring (32) and the auxiliary leaf spring (33) are connected to each other at the upper end and a lower end (30), respectively, and the locus of elastic deformation of the main leaf spring (32) is substantially identical to an arc locus (Y, Z) including a tangential line (X) within the upper surface of the substrate (12).</p> |
