Apparatus and method for replacing cable or wire in a hoisting system

Patent metadata

Field	Value
Publication number	US-10351396-B2
Application number	US-201515503407-A
Country	US
Kind code	B2
Filing date	Jul 8, 2015
Priority date	Aug 15, 2014
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

A method for replacing a length of a wire/cable in a hoisting system. The wire/cable extends from a storage drum to a winch. The method includes removing at least one lock which prevents a deadline anchor arranged between the storage drum and the winch from rotating, reeling onto the storage drum a first length of the wire/cable with a simultaneous coordinated operation of the deadline anchor and the storage drum, the simultaneous coordinated operation being controlled so that the wire/cable is in a continuous tension between the deadline anchor and the storage drum, securing the wire/cable to an attachment point, cutting a section of the wire/cable between the attachment point and the winch and removing the cut section of the wire/cable, reattaching the wire/cable remaining to the winch, reeling out a second length of the wire/cable from the storage drum, and securing the wire/cable to the deadline anchor.

First claim

What is claimed is:

1. A method for replacing a length of a wire or cable in a hoisting system, the wire or cable extending from a storage drum at a first end to a winch at a second end, the method comprising:
removing at least one lock which prevents a deadline anchor arranged between the storage drum and the winch from rotating;
reeling onto the storage drum a first length of the wire or cable with a simultaneous coordinated operation of the deadline anchor and the storage drum, the simultaneous coordinated operation being controlled so that the wire or cable is in a continuous tension between the deadline anchor and the storage drum;
securing the wire or cable to an attachment point;
cutting a section of the wire or cable between the attachment point and the winch and removing the cut section of the wire or cable from the winch;
discarding the cut section of the wire or cable which has been removed from the winch;
detaching the wire or cable from the attachment point and reattaching the wire or cable remaining to the winch;
reeling out wire or cable onto the winch from the storage drum; and
securing the wire or cable to the deadline anchor.

2. The method as recited in claim 1 , wherein a length of the wire or cable reeled out onto the winch from the storage drum corresponds to at least one of a length of the section of wire or cable which was cut and removed from the winch and to a length of the wire or cable which is temporarily stored on the storage drum.

3. The method as recited in claim 1 , wherein the removing of the at least one lock which prevents the deadline anchor arranged between the storage drum and the winch from rotating further comprises:
adjusting a hydraulic operation of the storage drum so that the wire or cable is held substantially tensioned between the deadline anchor and storage drum.

4. The method as recited in claim 1 , wherein the reeling out of the first length of the wire or cable from the storage drum further comprises:
adjusting a hydraulic operation of the storage drum so that the wire or cable is held substantially tensioned from the storage drum.

5. The method as recited in claim 1 , wherein the step of cutting the section of the wire or cable between the attachment point and the winch and removing the cut section of the wire or cable further comprises:
reeling off the wire or cable remaining from the winch.

Assignees

• Mhwirth As

Inventors

• Nielsen Ragnar

Classifications

• B66D3/043

  Block and tackle system with variable number of cable parts · CPC title

• B66D1/26 Primary

  having several drums or barrels · CPC title

• E21B19/02

  Rod or cable suspensions · CPC title

• B66D3/06

  with more than one pulley · CPC title

• E21B19/008 Primary

  Winding units, specially adapted for drilling operations · CPC title