| 摘要 |
The lock mechanism of a cylinder device is provided with: an engagement member (83) provided to either a cylinder (10) or a rod (12)in a protrudable manner; a cylindrical lock guide (85) provided to the other of the cylinder (10) and the rod (12) so as to be rotatable and so as to be prevented from moving in the axial direction; an engagement recess (123) provided in a facing surface (121) of the lock guide (85) and allowing the engagement member (83) to engage therewith; a rotation restriction mechanism (133) for restricting, during the movement of the rod (12) in the direction of extension thereof and while the engagement member (83) and the engagement recess (123) match each other in the circumferential direction, the rotation of the lock guide (85) from an axial position where the engagement member (83) is in contact with the one axial end side of the lock guide (85) to an axial position where the engagement member (83) engages with the engagement recess (123); and a helical groove (141) engaging with the engagement member (83) and helically formed in the facing surface (121) so as to extend from a position closer to the other axial end side than the engagement recess (123) to the one axial end side while avoiding the engagement recess (123) in the circumferential direction. |
