| 摘要 |
To prevent breakage, a female screw member 4 has meshing parts 4b, a container rear part 2 has concave groove parts 2b, a clutch spring member 5 disposed on the rear side of the female screw member 4 has meshing parts 5d meshing with the meshing parts 4b, a spring part 5b urging the meshing parts 5d frontward, and convex parts Se entering into the concave groove parts 2b and being movable in the axial direction and not rotatable with respect to the container rear part 2, a rear part of the clutch spring member 5 beyond the spring part 5b is not movable in the axial direction with respect to the container rear part 2, and the spring part 5b contracts to cancel the meshing around the axis between the meshing parts 4b and 5d when an excessive rotation torque effects on a movable body 3.
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