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US 4,249,474 AGranted
Load-carrying slings
AssigneeSTAS Societe Technique d'Accessoires Specialises
InventorJean F. Archer
Life of this patent
Estimating the term…
Abstract
A sling has an indicator device which automatically registers the maximum permissible load which can be carried in accordance with the instantaneous angle of inclination of the strands of the sling.
Claims4
A sling assembly comprising:
- a support adapted to be suspended from a crane;
- a pair of load-bearing strands each connected at one end to said support and provided with load-engaging means at their opposite ends whereby, depending upon the locations of connection of said load-engaging means to a load, said strands can be spread apart to include a variable angle with a vertical, thereby varying the maximum permissible load which can be supported by said strands;
- and
- an indicator for displaying the maximum permissible load which can be supported by the strands as a function of the angle included between the strands and a vertical, said indicator comprising:
- a scale member provided with indicia representing the maximum permissible load to be displayed by said indicator and an indicator member slidably connected with said scale member for designating particular indicia of said indicator in dependence upon the relative positions of said members,
- first connecting means for connecting one of said members to said support, and
- second connecting means for connecting portions of the other of said members to said strands.
4 more elements
Dependencies are inferred from the claim text.