Load-compensation device
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United States of America Patent
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Sep 15, 2015
Grant Date -
Jul 26, 2012
app pub date -
Jul 14, 2010
filing date -
Jul 15, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A load compensation device which can compensate loads on a working arm has a working arm supported by a first pivot-mounting part on a supporting body, an actuator cylinder supported by a second pivot-mounting part above the first pivot mounting part, and a piston rod of the actuator cylinder linked to a third pivot-mounting part of the working arm. A piston rod of a compensation cylinder is linked to a movable frame, and a piston of the compensation cylinder is urged upward by means of a compression coil spring which pushes the movable frame upward. The actuator cylinder and the compensation cylinder are linked by the inside of a conduit, and when the working arm is pivoted, the displacement of the piston of the actuator cylinder urges the piston of the compensation cylinder, a torque which balances the load torque of a load W on the working arm is generated.
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