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US 12,060,137 B2Granted
Lifting device and methods of operating a lifting device
AssigneeMacArtney A/S
InventorsMads Drachmann, Lasse Møller Rasmussen
Life of this patent
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Abstract
A lifting element, such as for a vessel or vehicle, comprising a lifting element, such as an oblong element, rotated by a number of electrical motors via a rotatable, such as an eccentric, element. The eccentric element ensures that the lifting element can only be tilted within a predetermined angle area increasing the safety thereof. Multiple electric motors are used where one motor counteracts the other within an angle interval to ensure that the tilting element does not tilt undesirably.
Claims6
A lifting device for a vessel or vehicle, the lifting device comprising:
- a lifting element tiltable around a predetermined first axis,
- a drive arrangement for tilting the lifting element, the drive arrangement comprising:
- a drive rod connected to the lifting element,
- a rotatable element rotated by one or more electrical motors around a second axis, the drive rod being connected to the rotatable element so as to rotate around a third axis not identical to the second axis, the rotatable element being rotatable around the second axis between a first position where the distance between the second axis and a fourth axis is a minimum distance and a second position where the distance between the second axis and the fourth axis is a maximum distance, the motor (s) being configured to rotate more than 360° to bring the rotatable element from the first position to the second position, wherein, during a 360 degree rotation of the rotatable element around the second axis, the distance between the second axis and the fourth axis varies between a minimum distance and a maximum distance.
1 more element
Dependencies are inferred from the claim text.