Method of lowering and raising loads by means of a jack assembly and lifting element
OwnerNils H. Ahlgreninventor
Life of this patent
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Abstract
In a method of lowering and raising loads by means of a jack assembly and lifting element the load is transferred from the lifting element by supporting means disposed on the lifting element and having a cross-section considerably larger than that of the lifting element. The supporting means are alternately carried by preferably dismountable carrying members with holes for the lifting element, which holes are smaller than the cross-section of the supporting means, the carrying members being mounted on relatively movable parts of the jack assembly.
Claims11
A method of lowering and raising a load by means of a jack assembly and lifting element, which comprises transferring the load from the lifting element by supporting means moveable along said lifting element and alternately carrying the supporting means by one-and-then the other of two carrying means having holes accommodating the passage of the lifting element, with said carrying means being mounted on [relatively moveable] parts of the jack assembly which are moveable relative to each other , and said lifting element being joined in series with other lengths of lifting element by connectors of a size incapable of passing through the holes of the carrying means and of a length substantially less than that of any one length of lifting element , and alternately dismounting the [carrier] carrying means to permit free passage of the connectors upwards and downwards and thus to permit free passage of the joined lengths of the lifting element.
A method of lowering and raising a load by means of a jack assembly and lifting element, which comprises transferring the load from the lifting element by supporting means moveable along said lifting element and alternatively carrying the supporting means by one-and-then the other of two carrying means having holes accommodating the passage of the lifting element, with said carrying means being mounted on parts of the jack assembly which are moveable relative to each other, and said lifting element being joined in series with other lengths of lifting element by connectors of a size incapable of passing through the holes of the carrying means and of a length substantially less than that of any one length of lifting element, and alternately dismounting said carrying means to permit free passage of said connectors upwards and downwards.
A method of lowering and raising a load by means of a lifting element and a jack assembly having load bearings parts;
- said method comprising the steps of:
- (a) transferring the support for a load carried by said lifting element from a first to a second supporting means which are movable along said lifting element and which may be fixed with respect to said lifting element at different positions therealong, carrying said first supporting means by a first carrying means to effect movement of the load, and thereafter carrying said second supporting means by a second carrying means to support the load so that said first carrying means and supporting means are free of load and may be moved relative to said lifting element;
- both said carrying means being provided with holes accommodating the passage of said lifting element therethrough and being removably mounted on said load bearing parts of said jack assembly;
- and
- (b) physically removing and remounting the carrying means which is free of load while the other of said carrying means is carrying its respective supporting means, to permit free passage of said supporting means upwards and downwards with respect to said lifting element.
Dependencies are inferred from the claim text.