| 摘要 |
An oil pressure type pneumatic torque wrench which comprises a main shaft, a liner rotatable by a rotor with at least four seal points which are formed on the inner circumferential surface of the liner and two blades provided on the main shaft. The center of two opposing seal points on each of the shaft and liner are spaced equal distances from diametrical lines thereof so that each rotation of the liner produces one impulse.
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