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US 4,423,685 AGranted
Crane trolley
AssigneeMannesmann Aktiengesellschaft
InventorWilhelm Kerckhoff
Life of this patent
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Abstract
A novel crane trolley has four guiding pulleys lying on opposed upper and lower guiding surfaces, arranged diagonally to eliminate the need for having eight guiding pulleys. On each side of the trolley are upper and lower guiding pulleys, with the lower in front on one side and the upper in front on the other side. The pulleys may be mounted under spring tension. Two such trolleys may be hinged together to support heavy loads.
Claims10
A crane trolley adapted to guide a carrying wheel along a beam, of the type having guide pulleys lying against upper and lower guide surfaces of said beam, the improvement comprising
- (a) only two upper guiding pulleys arranged diagonally facing each other at the upper guide surface,
- (b) only two lower guiding pulleys arranged diagonally facing each other at the lower guide surface and also placed diagonally from said upper guiding pulleys,
- (c) said upper and lower guiding pulleys lying closely against said upper and lower guide surfaces, respectively,
- (d) whereby imaginary connecting lines drawn between said four guiding pulleys would cross each other between said pulleys.
1 more element
Dependencies are inferred from the claim text.