Wire rope having an independent wire rope core

• US 5,946,898 A
• Filed: 07/28/1997
• Issued: 09/07/1999
• Est. Priority Date: 02/15/1996
• Status: Expired due to Fees

• Current Assignee: Shinko Kosen Kogyo Kabushiki Kaisha
• Original Assignee: Shinko Kosen Kogyo Kabushiki Kaisha
• Inventors: Ueki, Hirofumi, Sabae, Toshihiko, Kurata, Mikio
• Primary Examiner(s): STRYJEWSKI, WILLIAM T
• Application Number:
  US08/901,512
• Time in Patent Office: 771 Days
• Field of Search: 57/210, 57/212, 57/213, 57/214, 57/215, 57/216, 57/218, 57/219, 57/220, 57/231, 57/902, 57/9
• US Class Current: 57/215
• CPC Class Codes: D07B 1/0686 characterised by the core design
• CPC Class Codes: D07B 2201/2055 comprising filaments or fibers
• CPC Class Codes: D07B 2801/12 Strand
• CPC Class Codes: D07B 5/007 comprising postformed and thereby radially plastically deformed elements

Abstract

A wire rope including a core rope having a number of strands each made of a number of wires, and a number of outer strands closed on the core rope. Each strand of the core rope has a contact section where two or more wires of the strand of the core rope come into contact with the closed outer strand. A total of contact section rates Tz is 20 percent or more of a circumference of a circumscribed circle of the core rope: Tz (%)=Ti/C×100, wherein Tl denotes a length of a circumferential component of the contact section, "C" denotes a length of the circumference of the circumscribed circle of the core rope. A non-contact section rate Gz is below 20 percent of the circumference of the circumscribed circle of the core rope: Gz (%)={100-(n×Tz)}/n, wherein "n" denotes the number of strands.

Claims

1. A wire rope comprising:

a core rope including a plurality of core strands, each core strand having a plurality of core strand wires; and

a plurality of outer strands twisted together to surround the core rope, each of said outer strands including a plurality of outer strand wires;

each core strand of the core rope having such a flattened outside so as to provide a contact section where two or more core strand wires of at least one core strand come into contact with one of said outer strand wires of a juxtaposed outer strand;

said core rope having a total number of contact sections corresponding to the number of core strands such that the total of the contact sections Tz is 20 percent or more of the circumference of a circumscribed circle of the core rope, the contact section Tz being defined by the following equation;

space="preserve" listing-type="equation">Tz(%)=Tl/C×

100

wherein TI denotes the circumferential component of the contact section and C denotes the circumference of the circumscribed circle of the core rope.

2. A wire rope according to claim 1, wherein the core rope further has a plurality of non-contact sections where no core strand wires of the core strands of said core rope come into contact with the juxtaposed outer strand such that a non-contact section rate Gz is below 20 percent of the circumference of the circumscribed circle of the core rope, the non-contact section rate Gz being defined in Equation (2):

space="preserve" listing-type="equation">Gz(%)={100-(n×

Tz)}/n (2)

wherein n denotes the number of the core strands.

3. A wire rope comprising:

a core rope including a plurality of core strands, each core strand having a plurality of wires; and

a plurality of outer strands twisted together to surround the core rope, each of said outer strands including a plurality of outer strand wires;

each core strand of each core rope having such a flattened outside as to provide a contact section where two or more core strand wires of of at least one core strand come into contact with one of said outer strand wires of a juxtaposed outer strand;

said core rope further having a number of non-contact sections where no core strand wires of the core strands of the core rope come into contact with the outer strand wires of any outer strand such that a non-contact section rate Gz is below 20 percent of the circumference of the circumscribed circle of the core rope, the non-contact section rate Gz being defined by the following equation;

space="preserve" listing-type="equation">Gz(%)={100-(n×

Tz)}/n

wherein n denotes the number of the core strands.