| 摘要 |
PROBLEM TO BE SOLVED: To provide a double cylinder capable of maintaining settability between an inner cylinder and an outer cylinder and making the combination of both difficult to be broken.SOLUTION: A double cylinder 1 includes an outer cylinder 2, and an inner cylinder 3 disposed inside the outer cylinder by its relative movement along a center axis with respect to the outer cylinder. In one of the outer cylinder and the inner cylinder, an engaging projected part 20 is formed to project in a radial direction toward the other of the outer cylinder and the inner cylinder, in the other of the outer cylinder and the inner cylinder, an engaging recessed part 40 through which the engaging projected part is inserted is formed, and at the projection end of the engaging projection part, a projected part 22 is formed to project from the projection end toward a peripheral direction and lock a locked part 42 formed in the other of the outer cylinder and the inner cylinder from the radial direction.SELECTED DRAWING: Figure 1 |
