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WO2014070105A1 - Systèmes élévateurs à échelle - Google Patents

Systèmes élévateurs à échelle Download PDF

Info

Publication number
WO2014070105A1
WO2014070105A1 PCT/SG2012/000422 SG2012000422W WO2014070105A1 WO 2014070105 A1 WO2014070105 A1 WO 2014070105A1 SG 2012000422 W SG2012000422 W SG 2012000422W WO 2014070105 A1 WO2014070105 A1 WO 2014070105A1
Authority
WO
WIPO (PCT)
Prior art keywords
ladder
brace
lift system
carriage
truss frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SG2012/000422
Other languages
English (en)
Inventor
Aziz Amirali Hasham MERCHANT
Chun Ta CHAN
Wenjin Wu
Wee Leong YAP
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seatrium Offshore and Marine Technology Centre Pte Ltd
Original Assignee
Keppel Offshore and Marine Technology Centre Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keppel Offshore and Marine Technology Centre Pte Ltd filed Critical Keppel Offshore and Marine Technology Centre Pte Ltd
Priority to PCT/SG2012/000422 priority Critical patent/WO2014070105A1/fr
Publication of WO2014070105A1 publication Critical patent/WO2014070105A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/16—Platforms on, or for use on, ladders, e.g. liftable or lowerable platforms
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/06—Ladders for resting against objects, e.g. walls poles, trees in one piece
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/04—Ladders for resting against objects, e.g. walls poles, trees
    • E06C1/08—Ladders for resting against objects, e.g. walls poles, trees multi-part
    • E06C1/10—Sections fitted end to end
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/12—Lifts or other hoisting devices on ladders

Definitions

  • Embodiments of the invention relate generally to ladder lift systems for transfer of loads between two bodies.
  • the above-identified ladder hoists are designed to operate at high tilt angles where an angle between the ladder and a horizontal is in the region of 70 degrees. If the ladder hoists were arranged at less than 70 degrees, the ladder hoist of U.S. Patent Number 3,1 15,21 1 , for example, would exhibit sagging in the ladder tracks and operate at substantially below full load conditions. Also, these ladder hoists are designed to transfer loads between stationary bodies. Consequently, the above-identified ladder hoists are not suitable to be employed in the offshore and marine industry where the loads to be lifted are much heavier, for example, cables, chains and tools, which can weigh up to 1 tonne or even more.
  • Embodiments of the invention disclose a ladder lift system which includes a ladder suitably dimensioned to traverse between two bodies (i.e. a first and a second body).
  • the ladder lift system includes a first brace secured to the second body and also disposed to support the upper end of the ladder to prevent relative movement between the upper end of the ladder and the second body.
  • the ladder lift system also includes a reinforcement system connected between the ladder and the first brace to prevent deflection of the ladder tracks.
  • the ladder lift system further includes a carriage movably coupled to the tracks, and a motor for driving the carriage along the tracks to transfer a load between the first and the second body, and vice versa.
  • the reinforcement system is an elongate truss frame, wherein the elongate truss frame has a lower end connected between the lower end of the ladder and the first body, and an upper end connected between the upper end of the ladder and the first brace.
  • the reinforcement system includes a second brace being secured to the first body, at least a first elongate member connected between the first brace and a first intermediate position along the ladder, and at least a second elongate member connected between the second brace and a second intermediate position along the ladder.
  • Figure 1 illustrates a ladder lift system in a load transfer position according to one embodiment of the invention
  • Figure 2A is a perspective view of a truss frame illustrated in Figure 1 ;
  • Figure 2B is a close-up view of wall support pads provided on the truss frame of Figure 2A;
  • Figure 2C is a front view of the truss frame of Figure 2A;
  • Figure 2D is a sectional view taken along line A-A in Figure 2C;
  • Figure 2E is a top view of the truss frame of Figure 2A;
  • Figure 3 illustrates a ladder lift system in a load transfer position according to another embodiment of the invention
  • Figure 4A is a perspective view of a truss frame provided at the first body as illustrated in Figure 3;
  • Figure 4B is a front view of the truss frame of Figure 4A;
  • Figure 4C is a sectional view taken along line B-B in Figure 4B.
  • Figure 4D is a top view of the truss frame of Figure 4A.
  • Figure 1 illustrates a ladder lift system 100 in a load transfer position according to one embodiment of the invention.
  • a first body 1 and a second body 2 are disposed across a body of water 3, e.g. sea, channel, for transferring loads to and/or fro.
  • the ladder lift system 100 includes a ladder 10 which traverses the body of water 3, and has a lower end and an upper end.
  • the ladder may be provided with parallel tracks with spaced apart rungs connected thereto.
  • the ladder 10 may be provided as a single section or as multiple sections which may be coupled to each other by means of bolts and nuts.
  • the lower end of the ladder 10 may be provided with foot supports which engage with a first body 1 when the ladder 10 is disposed in a load transfer position. Also in the load transfer position, the upper end of the ladder 0 is coupled to a first brace frame which is in turn secured to the second body.
  • the ladder lift system 100 includes a reinforcement system to stiffen the ladder 10.
  • the reinforcement system is provided as an elongate truss frame 1 10 which is coupled to the ladder 10.
  • Various methods are available to couple the elongate truss frame 1 10 to the ladder 10.
  • the elongate truss frame 110 and ladder 10 may be coupled by high strength bolt and nuts which will allow assembly and disassembly of the frame 0 and ladder 10 as and when required.
  • the frame 110 and ladder 10 may be coupled by welding into a fixed structure.
  • An upper end of the elongate brace frame 110 is connected between (or disposed in compression support between) the ladder 10 and the first brace frame 20, while a lower end of the elongate brace frame 10 is connected between (or disposed in compression support between) the ladder 10 and the first body 1.
  • the ladder 10 in the load transfer position, may be disposed at a lower tilt angle ( ⁇ ) of less than 70 degrees relative to a horizontal without causing deflection in the ladder tracks even when carrying loads.
  • the ladder lift system 100 also includes a first brace 20 which is secured to the second body 2 through conventional means such as cable, wires, etc. In the load transfer position, the first brace 20 supports an upper end of the ladder 10 to prevent relative movement between the upper end of the ladder 10 and the second body 2.
  • the first brace 20 may be provided as a first truss frame.
  • Figure 2A is a perspective view of an example truss frame that may be used as the first brace 20.
  • the truss frame may be formed of a plurality of straight members or bars whose ends are connected at joints. At one side of the truss frame, a plurality of wall support pads 22 may be provided (see Figure 2B). The wall support pads 22 allow the truss frame to support against a wall of the second body 2.
  • the truss frame may also provide a separate ladder that allows operator access to the truss frame as and when required.
  • the truss frame may be provided with a retainer structure or other appropriate structure to receive the upper end of the ladder when it is disposed in a load transfer position.
  • Figure 2C is a front view of the truss frame of Figure 2A.
  • Figure 2D is a sectional view taken along line A-A in Figure 2C.
  • Figure 2E is a top view of the truss frame of Figure 2A.
  • a carriage 40 is movably coupled to the ladder tracks where the carriage 40 is suitably constructed and arranged to support loads thereon.
  • the carriage 40 may be provided with a platform or housing (not shown) for retaining the load within the carriage 40 or securing the load to the carriage 40 during transfer.
  • a motor e.g. winch motor, (not shown) for driving the carriage 40 to and from the upper and lower ends of the ladder may be provided on the first body 1.
  • the motor may be electrically coupled to one or more control devices to control a movement of the carriage 40 along the ladder tracks. For example, if two control devices (i.e. a first and a second control device) are provided, the control devices may be respectively disposed on the first body 1 and the second body 2 so that control of the carriage 40 may be assumed from either end to increase convenience of the operators involved.
  • the carriage 40 may be provided with a sensor for detecting carriage overload conditions. For example, if the sensor ascertains that the carriage load exceeds a predetermined limit, the operator may be appropriately notified and the carriage 40 is prevented from moving towards an opposite end of the ladder 10.
  • the ladder lift system 300 of Figure 3 includes a ladder 10, a first brace 20, carriage 40 and motor as described in the foregoing paragraphs.
  • the ladder lift system 300 of Figure 3 also includes a reinforcement system which employs the first brace 20, a second brace 30 and elongate members 310 connected between (or disposed in compression support between) the first brace 20 and the ladder 10 as well as between the second brace 30 and the ladder 10.
  • the elongate members 310 are coupled to intermediate positions along the ladder 10 and are subject to compressive stress exerted by the ladder 10 and the respective brace frame 20 or 30 thereby stiffening the ladder 10.
  • the reinforcement system allows the ladder 10 to operate at a lower tilt angle of less than 70 degrees relative to a horizontal without causing deflection in the ladder tracks.
  • the second brace 30 is secured to the first body 1 and may be provided as a second truss frame.
  • Figure 4A is a perspective view of an example truss frame that may be used as the second brace 30.
  • the truss frame may be formed of a plurality of straight members or bars whose ends are connected at joints.
  • a hook 32 may be provided at one side of the truss frame to allow the second brace 30 secure to a wall of the first body 1 .
  • the hook 32 may be provided as a metal sheet having an angled end to adapt to the wall or physical profile of the first body 1 .
  • the truss frame of the second brace 30 may be provided with a separate ladder that allows operator access to the truss frame as and when required.
  • the truss frame may be provided with a retainer structure or other appropriate structure to receive the lower end of the ladder 10 when it is disposed in a load transfer position.
  • Figure 4C is a front view of the truss frame of Figure 4A.
  • Figure 4D is a sectional view taken along line B-B in Figure 4C.
  • Figure 4E is a top view of the truss frame of Figure 4A.
  • Embodiments of the ladder lift system as described herein provide various advantages including, but not limited to:
  • the ladder lift system is capable of transferring heavy loads without deflection in the ladder.
  • U.S. Patent Number 3, 1 15,21 1 a person skilled in the art would appreciate that the ladder hoist of '21 1 may carry loads up to 250 kg when the ladder is arranged with a tilt of around 70 degrees, however the ladder hoist of '21 may carry loads up to 100 kg with tolerable deflection in the ladder tracks when the ladder is arranged with a tilt of around 45 degrees.
  • a ladder lift system of the present invention would be able to carry loads up to 250 kg with no or insignificant deflection even if the ladder is arranged with a tilt of around 45 degrees. Accordingly, this reduces reliance on cranes to transfer heavy loads.
  • the ladder system of the present invention would be capable of carrying loads of up to 1 tonne or more.
  • the ladder connecting the two bodies may have to be arranged at low tilt angles due to the horizontal distance between the two bodies. This may cause sagging of the ladder due to the ladder track length as well as the weight of the ladder and any load.
  • embodiments of the invention allow the ladder to be arranged at low tilt angles during the load transfer position, i.e. less than about 70 degrees with respect to the horizontal, without deflection in the ladder. This increases the reliability and safety of the ladder lift system even under high load conditions.
  • embodiments of the invention are also suitable in other situations where the two bodies are separated by a region which is less accessible to operator personnel, e.g. mud, sand, etc.
  • the overload sensor allows overload conditions to be detected before the carriage moves off along the tracks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)

Abstract

Des modes de réalisation de la présente invention concernent des systèmes élévateurs à échelle pour le transfert de charge entre deux corps qui sont disposés d'un côté et de l'autre d'un corps d'eau. Les systèmes élévateurs à échelle sont pourvus d'un système de renfort pour permettre à l'échelle de fonctionner à de faibles angles d'inclinaison et de transférer de charges lourdes sans déflexion dans l'échelle.
PCT/SG2012/000422 2012-11-05 2012-11-05 Systèmes élévateurs à échelle Ceased WO2014070105A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SG2012/000422 WO2014070105A1 (fr) 2012-11-05 2012-11-05 Systèmes élévateurs à échelle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SG2012/000422 WO2014070105A1 (fr) 2012-11-05 2012-11-05 Systèmes élévateurs à échelle

Publications (1)

Publication Number Publication Date
WO2014070105A1 true WO2014070105A1 (fr) 2014-05-08

Family

ID=50627825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2012/000422 Ceased WO2014070105A1 (fr) 2012-11-05 2012-11-05 Systèmes élévateurs à échelle

Country Status (1)

Country Link
WO (1) WO2014070105A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183423A (en) * 1976-08-12 1980-01-15 Lewis James P Ladder hoist
US4222140A (en) * 1979-02-23 1980-09-16 F. C. Schaffer & Associates, Inc. Boarding platform
US4414911A (en) * 1981-06-19 1983-11-15 Belinsky Sidney I Berth for mooring supply ship to an offshore platform and for transferring personnel between them
US20080011546A1 (en) * 2005-10-05 2008-01-17 Korchagin Pavel V Hoisting systems for high-rise building maintenance
US7424932B1 (en) * 2004-09-02 2008-09-16 Patrick Arthur Murphy Lifting hoist assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183423A (en) * 1976-08-12 1980-01-15 Lewis James P Ladder hoist
US4222140A (en) * 1979-02-23 1980-09-16 F. C. Schaffer & Associates, Inc. Boarding platform
US4414911A (en) * 1981-06-19 1983-11-15 Belinsky Sidney I Berth for mooring supply ship to an offshore platform and for transferring personnel between them
US7424932B1 (en) * 2004-09-02 2008-09-16 Patrick Arthur Murphy Lifting hoist assembly
US20080011546A1 (en) * 2005-10-05 2008-01-17 Korchagin Pavel V Hoisting systems for high-rise building maintenance

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