| 摘要 |
PURPOSE:To make it possible to follow the variation in measuring span, by sliding a piston in a cylinder, communicating the inside of the cylinder and a tightly closed container, and arranging a sensor on the piston. CONSTITUTION:A hole 12, whose diameter is slightly larger than the diameter of a linking rod 11, is formed at the bottom part of a cylinder 6. The inside of the cylinder 6 and the inside of a tightly closed container are communicated with the hole 12. When a train is on a rail 1, under which a pressure sensor is provided, the sensor is deformed downward by a slight amount. Thus, a load is applied on the sensor 3. Oil is slowly moved into the container 7 through a slight gap between the linking rod 11 and the hole 12 of the cylinder 6. Then, the output of the sensor 3 is slowly decreased. In this way, followability to the variation of the measuring span can be obtained.
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