CRANE COMPRISING A CONICAL PEDESTAL
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United States of America Patent
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Issued Date -
Aug 4, 2016
app pub date -
Sep 2, 2014
filing date -
Sep 2, 2014
priority date (Note) -
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Abstract
A crane includes a pedestal having a circular periphery, a base supported with respect to the pedestal so as to be rotatable along a substantially vertical axis, a boom fitted to the base so as to be rotatable along a horizontal axis and adjustment elements for adjusting the angle of inclination of the boom. The base is provided with a series of rolling elements which each have a substantially vertical axis, which series of rolling elements can be rolled over the circular periphery of the pedestal and which is always situated on the pedestal facing the boom. As a result, the series of rolling elements is subjected to a tensile load on account of the torque exerted on the pedestal by the boom and is held against the circular periphery of the pedestal. In order to simplify the construction, the base is designed as having a strip-shaped pulling element.
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