| 摘要 |
PROBLEM TO BE SOLVED: To provide a measuring instrument that can suppress a change in pressure of an inside of a casing.SOLUTION: A linear gauge 1 comprises: a cylindrical casing 2; a spindle 3 that is inserted into the casing 2, and moves along an own axial direction; and a bellows 4 that is attached so as to be across the casing 2 and spindle 3. The casing 2 comprises: a spindle holding part 5 that is formed so as to be concentric with the casing 2, and so as to protrude from a lower end face of the casing 2; a sensing part 6 that is housed inside the casing 2, and senses an amount of movement of the spindle 3; an air hole 7 that is formed on an upper end face of the casing 2 to communicate with an outside, and causes air to flow in and out an inside of the casing 2; and an air hole bellows part 8 that is provided inside the casing 2 so as to block the air hole 7.SELECTED DRAWING: Figure 1 |
