Rope
AssigneeGreening Donald Co. Ltd.
InventorRobert J. Wilcox
Life of this patent
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Abstract
The invention provides a rope having a central strand and a plurality of outer strands extending helically about the central strand. Each of the outer strands consists of a plurality of elements in a helical wrap, at least some of these elements having a core of synthetic plastic filaments extending generally in parallel with one another and a sheath about the core containing the filaments. The invention also provides a method of making the rope.
Claims11
A rope comprising:
- a central strand;
- a plurality of outer strands extending helically about the central strand;
- and
- the central and outer strands each comprising a plurality of elements wrapped helically, each of the elements having a core of synthetic plastic filaments of denier no greater than 21000 and extending generally in parallel with one another, and a sheath about the core containing the filaments.
A method of manufacturing a rope comrpising the steps:
- grouping synthetic plastic filaments into bundles having a denier less than 21000;
- passing each bundle through an extruder to coat the bundle with a synthetic plastic sheath to form elements;
- feeding groups of the elements into a device to wrap the elements helically to form strands;
- feeding groups of strands through a device to form the strands into a rope having a central strand and outer strands wrapped helically about the central strand.
In a rope comprising a central strand, outer strands wrapped helically about the central strand, and each of the strands being made up of helically-wrapped elements, the improvement in which the elements are made up of a core of synthetic plastic filaments having a denier of less than 21000 and a sheath extended about the filaments to contain the filaments and to protect the filaments from abrasion at crossovers with other elements.
Dependencies are inferred from the claim text.