| 摘要 |
This invention relates to an improved jack bit comprised of a tubular jack actuator for driving a scissor or screw type jack and a shaft having a curved latch end engaged within the jack actuator for effecting rotation of the jack actuator. The improvement resides in a centering barrel slidably carried on the shaft and within the jack actuator whereby on rotation of the shaft by a power driver, the centering barrel provides for smooth and continuous transfer of energy of the shaft engaged with the jack actuator.
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