| 摘要 |
A rotational float system ( 44 ) that is meant to be used with existing side load protection systems and that may be selectively operated to permit a digger derrick rotation motor ( 20 ) or other rotatable equipment to freely rotate toward a side load to ease operation of and prevent damage to the digger derrick ( 10 ) and to assist in the correct installation of screw anchors. The rotational float system ( 44 ) includes valve structure ( 46 ) interposed between the ports ( 32, 34 ) of a hydraulic rotation motor ( 20 ) and a control mechanism ( 48 ) for selectively opening and closing the valve structure ( 46 ). The valve structure ( 46 ) is normally biased to a closed position and the control mechanism ( 48 ) is normally open. When the control mechanism ( 48 ) is operated, it opens the valve structure ( 46 ) to connect the ports ( 32, 34 ) of the rotation motor ( 20 ) to one another. This allows the pressure of the hydraulic fluid present at each of the ports ( 32, 34 ) to equalize so that the rotation motor ( 20 ) may float or rotate toward any external side loads.
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