| 摘要 |
PURPOSE:To surely perform adjusting action also effectively prevent overadjustment, by arranging an adjuster not extensible at fluid pressure except a preset level in a pressure fluid chamber. CONSTITUTION:If high pressure fluid is fed to a pressure fluid chamber 7, pressing force to an adjusting bolt 10 rightward is increased, and a recessed part 21 of an adjusting bolt head part 10b is strongly contacted to a spherical part 23a of a rod 23 to increase friction resistance. In this way, friction resistance, limiting rotary movement of the adjusting bolt 10, becomes larger than rotary torque, and the adjusting bolt 10 can not be rotated. Further a protrusive stripe 11c in a head part 11b of a nut member 11 is set in such a manner as not to be disengaged from a grooved part 5d of a piston 5, and the nut member 11 is never rotated to perform adjustment. |
