JACK DEVICE AND WORK MACHINE EQUIPPED WITH SAME
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United States of America Patent
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Issued Date -
Oct 19, 2023
app pub date -
Sep 14, 2021
filing date -
Sep 30, 2020
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Abstract
Provided is a jack device rendering an operation of changing the posture of a jack cylinder easy without using a device that actively changes the posture. The jack device includes an arm, a jack body including the jack cylinder, and a reaction-force application unit supported by the arm. The reaction-force application unit makes a reaction-force moment act on the jack body in all postures from the upright posture to the storage posture in response to a force applied from the jack body. The reaction-force application unit makes a reaction-force moment greater than a self-weight moment act on the jack body in the storage posture and makes a reaction-force moment smaller than the self-weight moment act on the jack body in the upright posture.
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