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US 4,236,859 AGranted
Mobile hoist
AssigneeMarine Travelift, Inc.
InventorsRichard A. Stearn, Gerald P. Lamer, Norbert W. Lenius
Life of this patent
Estimating the term…
Abstract
A straddle-type mobile hoist having loading slings operatively connected to automatically equalize the loading applied through the slings and adapted to vary the lateral spacing between slings.
Claims12
A mobile hoist for lifting and carrying loads comprising
- a frame freely movable upon a supporting surface and having spaced parallel support members carried above the supporting surface;
- a pluraliy of vertically movable load supporting slings carried by said support members with each one of said plurality extending therebetween,
- one of said plurality of load supporting slings being laterally movable upon said support members relative to another of said plurality of load supporting slings for effecting varying weight distribution of a load being supported thereby,
- said one of said plurality of vertically movable load suporting sling which is laterally movable upon said support member relative to another of said plurality of vertically movable load supporting slings being operatively connected to one of said other plurality of load supporting slings by a common cable means for effecting vertical movement of both of said load supporting slings and equalizing the force applied between said load supporting slings when engaging a load to be lifted and carried by said hoist,
- another one of said plurality of vertically movable load supporting slings being operatively connected to a second cable means for effecting vertical movement thereof independent of the vertical movement of said load supporting means coupled together by said common cable, and
- traveler means operatively positioned between said plurality of load supporting slings for moving said one of said plurality of load supporting slings laterally relative to another of said plurality of load supporting means.
3 more elements
A mobile hoist for lifting and carrying loads comprising
- a frame including at least two spaced parallel support members carried above and freely movable upon a supporting surface,
- a plurality of load supporting slings extending between and operatively coupled to said spaced parallel support members for engaging a load to be lifted and carried by said hoist,
- at least two hoist cable means each mutually exclusively supported from one of said support members and operatively interconnecting the adjacent ends of said plurality of load supporting slings for effecting vertical movement of said load supporting slings and equalizing the force applied between said load supporting slings when engaging a load to be lifted and carried by said hoist and
- force applying means for applying an equalizing force to said hoist cable means to effect equal vertical movement of each one of said plurality of load supporting slings when a loading force is not imposed thereon.
1 more element
A mobile hoist for lifting and carrying loads comprising
- a frame including at least two spaced parallel support members carried above and freely movable upon a supporting surface,
- a plurality of load supporting slings extending between and operatively coupled to said spaced parallel support members for engaging a load to be lifted and carried by said hoist,
- at least two hoist cable means each mutually exclusively supported from one of said support members and operatively interconnecting the adjacent ends of said plurality of load supporting slings for effecting vertical movement of said load supporting slings and equalizing the force applied between said load supporting slings when engaging a load to be lifted and carried by said hoist, and
- said cable means includes a multiple output variable torque drive with each output thereof coupled to a cable connected to one of each of said vertically movable load supporting slings for effecting variable loading of each of said loading supporting slings in response to the output of said variable torque drives.
1 more element
A mobile hoist for lifting and carrying loads comprising
- a frame including at least two spaced parallel support members carried above and freely movable upon a supporting surface,
- a plurality of load supporting slings extending between and operatively coupled to said spaced parallel support members for engaging a load to be lifted and carried by said hoist,
- at least two hoist cable means each mutually exclusively supported from one of said support members and operatively interconnecting the adjacent ends of said plurality of load supporting slings for effecting vertical movement of said load supporting slings and equalizing the force applied between said load supporting slings when engaging a load to be lifted and carried by said hoist, and
- force applying means for applying a predetermined force to said flexible hoist cable means in addition to the loading forces applied through said plurality of vertically movable load supporting slings to vary the distribution of the loading forces applied thereby.
1 more element
Dependencies are inferred from the claim text.