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US 2019/0055111 A1Published application
Crane Position Indicator
OwnerRichard A. Cranney, IIIinventor
Life of this patent
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Abstract
A method and apparatus for lifting loads support from a crane to eliminate swaying of the load includes providing the crane with a laser source on either side of the crane. The center of gravity of the load is marked on the load and the boom is positioned such that the laser lights projection on the ground or on surface of the load and the center of gravity of the load are aligned in a straight line.
Claims7
A method of correctly lifting a load by a crane comprising;
- a) marking the center of gravity of the load on the load,
- b) locating a pair of laser lights on both sides of a lifting devices,
- c) manipulating the lifting device such that the projections of the laser lights on a surface and the center of gravity of the load are aligned in a straight line.
A laser light assembly comprising;
- a) a shaft,
- b) a housing rotatably supported on the shaft,
- c) a weighted arm extending outwardly from housing, the weighted arm including a laser light, a battery and a switch positioned within a hollow cylinder.
A method of erecting a stationary crane by a mobile crane that includes an extensible boom that also may be raised and lowered comprising;
- a) providing the mobile crane with a laser light source
- b) determining and marking on the ground the minimum and maximum radius of the boom from a ground point of the mobile crane, and
- c) manipulating the mobile crane boom such that laser light remains within the maximum and minimum radii of the boom.
Dependencies are inferred from the claim text.