| 摘要 |
PURPOSE:To always display the amount of the oil in a cartridge oil tank, by providing a load variable resistor capable of obtaining a relatively large change in a resistance value on the basis of small displacement. CONSTITUTION:When there is no oil in a cartridge oil tank 2 and the position of the leg part 4A of an auxiliary oil tank 3 brings the press lid 5 of a variable resistor 10 to the state shown by a solid line, the max. value is shown between the terminals of a resistance plate 13. Next, when the press lid 15 is pushed down by the increase in a wt. due to the injection of the oil, the shortcircuit piece 14 of a load variable resistor 10 becomes almost flat as shown by a dotted line from a bow shape and the leg part 4A displaces downwardly by D and a resistance value shows the min. value. Then, the load variable resistor 10 changing in its resistance value to a large extent on the basis of small displacement in response to the wt. of the oil in the cartridge oil tank 2 and an ammeter are combined and predetermined voltage is applied to perform the display of the ammeter in relation to the amount of the oil in the cartridge oil tank 2. By this method, the amount of the oil in the cartridge oil tank 2 can be always displayed.
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