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Elevator tension member assembly techniques

A lifter and pulling piece technology, which is applied to lifts, auxiliary devices for rope making, accessories of automatic teller machines, etc., can solve the problems of reduced service life, reduced breaking strength and bending fatigue resistance of lift belt ropes, etc.

Inactive Publication Date: 2006-12-27
OTIS ELEVATOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is very obvious
The required breaking strength and bending fatigue resistance of tension members in elevator belt ropes is reduced when this cut-and-weld technique is used
In some cases, service life based on bending fatigue is reduced by as much as 50%

Method used

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  • Elevator tension member assembly techniques
  • Elevator tension member assembly techniques
  • Elevator tension member assembly techniques

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] FIG. 1A shows a portion of an elevator belt rope 20 . A plurality of tension members 22 are encapsulated within a polyurethane sheath 24 . In one example, tension member 22 is a cable comprising 7 strands, each strand comprising 7 individual wires. The wires are twisted in a known manner to form strands, and the strands are twisted in a known manner to form cables. In the example shown, 12 tension members 22 (ie 12 cables) are provided. In another example, 8 tension members are provided along the width of the strap 20 .

[0021] FIG. 1B shows a sheathed cord 25 having a plurality of tension members 26 fabricated similarly to the exemplary tension member 22 shown in FIG. 1A . A polyurethane sheath 28 surrounds the tension members 26 twisted together into a rope.

[0022] FIG. 2 schematically shows an assembly process 30 in which a wire body 32 of individual wires is supplied to a cable twisting machine 34 which first twists a plurality of wires into individual strand...

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PUM

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Abstract

An elevator belt (20) or rope (25) includes a plurality of tension members (22, 26, 46) encased within a polyurethane jacket (24, 28). Each tension member includes a plurality of strands (42), which are each made up of a plurality of wires (40). During the manufacturing process, broken wire (44, 54) ends are recaptured so that they do not protrude outward from the strands (42) or cords (46). A variety of recapture techniques are disclosed.

Description

technical field [0001] The present invention relates generally to elevator tension members such as used in belts or ropes, and in particular the invention relates to the control and arrangement of tension member components in assemblies. Background technique [0002] Elevator systems typically include a car and counterweight supported by ropes or belts. Conventional equipment moves ropes or belts to move a car, for example, between floors of a building. Typically a wire rope is used. Recently, flat cable structures have been proposed. The flat strap offers advantages in terms of traction and bending fatigue resistance. [0003] An exemplary flat belt cable structure includes a plurality of steel tension members enclosed within a polyurethane sheath. The steel tension member may comprise a plurality of wires twisted together to form a cable for use as a tension member. It is possible for one or more wires to break at different times during the assembly process. Broken w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/02B42D9/04D07B7/02G07F19/00
CPCD07B7/08G07F19/201D07B2501/2007B21F7/00D07B2205/2064G07F19/20D07B7/02D07B2301/307D07B2801/22
Inventor H·J·奥唐纳
Owner OTIS ELEVATOR CO