WO2001020082A1 - Ladder fender - Google Patents

Ladder fender Download PDF

Info

Publication number
WO2001020082A1
WO2001020082A1 PCT/IB2000/000904 IB0000904W WO0120082A1 WO 2001020082 A1 WO2001020082 A1 WO 2001020082A1 IB 0000904 W IB0000904 W IB 0000904W WO 0120082 A1 WO0120082 A1 WO 0120082A1
Authority
WO
WIPO (PCT)
Prior art keywords
fender
ladder
rungs
stringers
quayside
Prior art date
Application number
PCT/IB2000/000904
Other languages
French (fr)
Inventor
Michael Stuart Anderson
Original Assignee
Transvaal Rubber Company (Proprietary) Limited
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 Transvaal Rubber Company (Proprietary) Limited filed Critical Transvaal Rubber Company (Proprietary) Limited
Priority to AU54201/00A priority Critical patent/AU5420100A/en
Publication of WO2001020082A1 publication Critical patent/WO2001020082A1/en

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
    • E06C7/08—Special construction of longitudinal members, or rungs or other treads
    • E06C7/082—Connections between rungs or treads and longitudinal members
    • E06C7/084—Rungs comprising projecting tabs or flanges
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/20—Equipment for shipping on coasts, in harbours or on other fixed marine structures, e.g. bollards
    • E02B3/26—Fenders
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C9/00—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes
    • E06C9/06—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted
    • E06C9/08—Ladders characterised by being permanently attached to fixed structures, e.g. fire escapes movably mounted with rigid longitudinal members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Definitions

  • THIS invention relates to a ladder fender
  • Ladder fenders which integrate the functions of a ladder and fender in a single unit, are typically used in quayside applications In such applications the ladder fender is mounted vertically to extend down the vertical face of a quayside to provide for personnel access and to serve as an impact absorbing fender for vessels approaching the quayside or moored there
  • the present invention seeks to provide an alternative ladder fender 82 _ ⁇ _ PCT/IBOO/00904
  • a ladder fender comprising a ladder having one or more stringers and rungs transverse to the st ⁇ nger(s), and at least one hollow, tubular fender structure which is made of resilient material and which is penetrated transversely by the rungs of the ladder with no rigid connection between the fender structure and the ladder, whereby the fender structure is capable of at least limited resilient deformation relative to the ladder
  • each fender structure preferably comprises a plurality of hollow cylindrical fender elements arranged coaxially in end to end relationship Conveniently, the fender elements are held in coaxial alignment by means of resilient alignment elements each locating partially in one fender element and partially in an adjacent fender element
  • each stringer is threaded through openings in the rungs and has a suspension formation, possibly in the form of an eye, at an operatively upper end thereof by means of which it can be suspended from a supporting structure on a quay so as to hang vertically adjacent the quayside
  • Tread portions of the rungs which are located outside the fender structures are preferably coated with rubber to provide a non-slip characteristic
  • a quayside ladder fender installation comprising a ladder fender as summarised above and a fixed supporting structure extending laterally over the quayside, the st ⁇ nger(s) of the ladder fender being suspended from the supporting structure with fender structure(s) lying adjacent an upright wall of the quayside, the suspension of the ladder fender from the supporting structure being such as to allow at least limited swinging movement of the ladder fender relative to the supporting structure
  • a ladder fender comprising a ladder and a resilient, hollow tubular fender structure, the ladder including at least one stringer relative to which a plurality of rungs extend transversely and which extends axially and with clearance in the hollow of the fender structure
  • Figure 1 shows a partly sectioned side view of a ladder fender according to this invention
  • Figure 2 diagrammatically illustrates how the ladder fender of Figure
  • FIG. 3 shows a partly sectioned side view of another ladder fender according to this invention DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
  • the ladder fender 10 seen in Figure 1 has an elongate ladder including a pair of parallel stringers 12 with a series of spaced rungs 14 extending transversely between the stringers, and a pair of fender structures 16
  • the stringers 12 are slender stainless steel bars and are fitted with eyes 18 at their upper ends
  • the rungs are stainless steel tubes formed with vertical openings 20 towards their opposite ends through which the stringers 12 are threaded
  • Each rung is also formed with further vertical openings 22, adjacent the openings 20, to take vertical locating pins 24 as described below
  • Each fender structure 16 is composed of fender elements 26
  • Each fender element 26 is a hollow tubular member made of a resilient material such as rubber
  • the elements 26 are arranged end to end to form the illustrated, elongate, hollow, tubular fender structure They are maintained in coaxial alignment by hollow cylindrical alignment elements 28 fitting snugly in the ends of the fender elements and locating partially in one element and partially in the next
  • Each fender element 26 is formed with two diametrically extending openings 30 which intersect the central bore thereof
  • the ends of the rungs 14 penetrate the fender elements through these openings and extend into the central hollows of the fender elements
  • the stringers 12 pass vertically through the fender structures and are threaded through the openings 20
  • the lower ends of the stringers are threaded to take nuts 32 beneath the lowest rung 14
  • the tread portions 34 of the rungs are encased in rubber to provide a non-slip characteristic
  • the stringers 12 of the ladder pass loosely, with clearance, through the fender elements 26 and the alignment elements 28 and the rungs 14 of the ladder likewise pass loosely through the openings 30.
  • the ends of the rungs are located with respect to the fender elements by means of the vertical locating pins 24 which, as mentioned previously, are inserted in the openings 22
  • the fender structures are capable of deforming relative to the ladder and without transferring the applied loading and deformation to the ladder
  • the ladder fender 10 is suspended vertically at a quayside.
  • Figure 2 in which the numeral 36 indicates the vertical quayside wall and the numeral 38 the horizontal quay surface
  • An arched hand-rail 40 is secured to a structure 42, mounted on the surface 38, which has portions 44 projecting out over the quayside as illustrated.
  • the eyes 18 of the str ⁇ ngers12 are located over hooks at the ends of the projecting portions 44 so that the ladder fender can hang vertically with the fender structures 16, at rest, lying against the quayside wall 36
  • FIG 3 which illustrates another embodiment 46 of the invention
  • components corresponding to those in Figure 1 are indicated with the same reference numerals
  • this embodiment which is suspended at the quayside in the same manner as the ladder of Figure 1 , there is a single fender structure 16 located centrally between the stringers 12
  • the rungs 14 extend diametrically through the fender elements 26 of the fender structure and are located with respect thereto by pairs of locating pins 24 inserted in vertical openings in the rungs, within the fender structure, as illustrated.
  • the outer tread portions 34 of the rungs are rubber coated to reduce slippage
  • the fender structure(s) 16 have a considerably greater transverse dimension, in a direction normal to the quayside wall 36, than the ladder itself
  • the fender structures are able to serve a normal fender function to absorb impacts from vessels approaching or moored at the quayside, thereby protecting the quayside and ladder as well as the vessel itself from damage
  • the illustrated embodiments have the important advantage that resilient components of the fender structure(s) and the rigid components of the ladder are not firmly connected to one another thereby allowing the relative deformation mentioned above to take place
  • the resilient components can deform to absorb the impact forces without transferring undue loading and possible deformation to the rigid ladder components
  • a further advantage of the illustrated embodiments arises from the manner in which they are suspended at the quayside, allowing them to swing relatively freely if impacted upon This is in contrast to conventional ladder fenders which are rigidly bolted or otherwise fixed to the vertical quayside wall
  • the stringers 12 of the ladder are in the form of stainless steel rods or bars It is however within the scope of the invention for these components to be provided by lengths of flexible, typicially stainless steel cable

Abstract

The invention concerns a ladder fender comprising a ladder having one or more stringers and rungs transverse to the stringer(s), and at least one hollow, tubular fender structure which is made of resilient material and which is penetrated transversely by the rungs of the ladder. There is no rigid connection between the fender structure and the ladder. As a result, the fender structure is capable of at least limited resilient deformation relative to the ladder, thereby reducing potential damage to the ladder.

Description

LADDER FENDER
BACKGROUND TO THE INVENTION
THIS invention relates to a ladder fender
Ladder fenders which integrate the functions of a ladder and fender in a single unit, are typically used in quayside applications In such applications the ladder fender is mounted vertically to extend down the vertical face of a quayside to provide for personnel access and to serve as an impact absorbing fender for vessels approaching the quayside or moored there
In known ladder fenders steel components of the ladder are moulded into the rubber of the fender This type of construction has been found to be unsatisfactory because vessel-applied impacts on the ladder fender and consequent bending and flexing thereof can cause premature ladder and/or fender failure
The present invention seeks to provide an alternative ladder fender 82 _η_ PCT/IBOO/00904
SUMMARY OF THE INVENTION
According to one aspect of the invention there is provided a ladder fender comprising a ladder having one or more stringers and rungs transverse to the stπnger(s), and at least one hollow, tubular fender structure which is made of resilient material and which is penetrated transversely by the rungs of the ladder with no rigid connection between the fender structure and the ladder, whereby the fender structure is capable of at least limited resilient deformation relative to the ladder
In one embodiment of the invention, there is a pair of parallel stringers each extending longitudinally through a fender structure, the rungs extending between the stringers through transverse openings in the fender structures In another embodiment of the invention, there is a pair of stringers located on opposite sides of a fender structure, the rungs extending transversely through the fender structure between the stringers In a third embodiment of the invention, there is a single stringer extending longitudinally through a fender structure, the rungs having respective portions which penetrate the fender structure and extend to opposite sides of the stringer
In each embodiment, each fender structure preferably comprises a plurality of hollow cylindrical fender elements arranged coaxially in end to end relationship Conveniently, the fender elements are held in coaxial alignment by means of resilient alignment elements each locating partially in one fender element and partially in an adjacent fender element
Typically each stringer is threaded through openings in the rungs and has a suspension formation, possibly in the form of an eye, at an operatively upper end thereof by means of which it can be suspended from a supporting structure on a quay so as to hang vertically adjacent the quayside
Tread portions of the rungs which are located outside the fender structures are preferably coated with rubber to provide a non-slip characteristic According to another aspect of the invention there is provided a quayside ladder fender installation comprising a ladder fender as summarised above and a fixed supporting structure extending laterally over the quayside, the stπnger(s) of the ladder fender being suspended from the supporting structure with fender structure(s) lying adjacent an upright wall of the quayside, the suspension of the ladder fender from the supporting structure being such as to allow at least limited swinging movement of the ladder fender relative to the supporting structure
According to yet another aspect of the invention there is provided a ladder fender comprising a ladder and a resilient, hollow tubular fender structure, the ladder including at least one stringer relative to which a plurality of rungs extend transversely and which extends axially and with clearance in the hollow of the fender structure
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail, by way of example only, with reference to the accompanying drawings in which
Figure 1 shows a partly sectioned side view of a ladder fender according to this invention,
Figure 2 diagrammatically illustrates how the ladder fender of Figure
1 is suspended in use, and
Figure 3 shows a partly sectioned side view of another ladder fender according to this invention DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
The ladder fender 10 seen in Figure 1 has an elongate ladder including a pair of parallel stringers 12 with a series of spaced rungs 14 extending transversely between the stringers, and a pair of fender structures 16
The stringers 12 are slender stainless steel bars and are fitted with eyes 18 at their upper ends The rungs are stainless steel tubes formed with vertical openings 20 towards their opposite ends through which the stringers 12 are threaded Each rung is also formed with further vertical openings 22, adjacent the openings 20, to take vertical locating pins 24 as described below
Each fender structure 16 is composed of fender elements 26 Each fender element 26 is a hollow tubular member made of a resilient material such as rubber The elements 26 are arranged end to end to form the illustrated, elongate, hollow, tubular fender structure They are maintained in coaxial alignment by hollow cylindrical alignment elements 28 fitting snugly in the ends of the fender elements and locating partially in one element and partially in the next
Each fender element 26 is formed with two diametrically extending openings 30 which intersect the central bore thereof The ends of the rungs 14 penetrate the fender elements through these openings and extend into the central hollows of the fender elements The stringers 12 pass vertically through the fender structures and are threaded through the openings 20 The lower ends of the stringers are threaded to take nuts 32 beneath the lowest rung 14
Between the fender structures 16 the tread portions 34 of the rungs are encased in rubber to provide a non-slip characteristic There is no bond between the fender structures and the ladder, so that the fender structures are not rigidly connected to the ladder The stringers 12 of the ladder pass loosely, with clearance, through the fender elements 26 and the alignment elements 28 and the rungs 14 of the ladder likewise pass loosely through the openings 30. The ends of the rungs are located with respect to the fender elements by means of the vertical locating pins 24 which, as mentioned previously, are inserted in the openings 22 In the absence of a bond or other rigid connection between the steel ladder components and the rubber or rubber-based fender structures, it will be understood that the fender structures are capable of deforming relative to the ladder and without transferring the applied loading and deformation to the ladder
In use, the ladder fender 10 is suspended vertically at a quayside. This is illustrated in Figure 2 in which the numeral 36 indicates the vertical quayside wall and the numeral 38 the horizontal quay surface An arched hand-rail 40 is secured to a structure 42, mounted on the surface 38, which has portions 44 projecting out over the quayside as illustrated. The eyes 18 of the strιngers12 are located over hooks at the ends of the projecting portions 44 so that the ladder fender can hang vertically with the fender structures 16, at rest, lying against the quayside wall 36
In Figure 3, which illustrates another embodiment 46 of the invention, components corresponding to those in Figure 1 are indicated with the same reference numerals In this embodiment, which is suspended at the quayside in the same manner as the ladder of Figure 1 , there is a single fender structure 16 located centrally between the stringers 12 The rungs 14 extend diametrically through the fender elements 26 of the fender structure and are located with respect thereto by pairs of locating pins 24 inserted in vertical openings in the rungs, within the fender structure, as illustrated. The outer tread portions 34 of the rungs are rubber coated to reduce slippage It will be appreciated that the fender structure(s) 16 have a considerably greater transverse dimension, in a direction normal to the quayside wall 36, than the ladder itself As a result, the fender structures are able to serve a normal fender function to absorb impacts from vessels approaching or moored at the quayside, thereby protecting the quayside and ladder as well as the vessel itself from damage
When compared to conventional ladder fenders the illustrated embodiments have the important advantage that resilient components of the fender structure(s) and the rigid components of the ladder are not firmly connected to one another thereby allowing the relative deformation mentioned above to take place Thus if the fender structure 16 of either embodiment is impacted by a vessei the resilient components can deform to absorb the impact forces without transferring undue loading and possible deformation to the rigid ladder components It is accordingly envisaged that ladder fenders of the invention will be less prone to failure than currently known ladder fenders
It will also be understood that, should damage occur, individual fender elements 26, stringers 12 and/or rungs 14 can be replaced without undue difficulty
A further advantage of the illustrated embodiments arises from the manner in which they are suspended at the quayside, allowing them to swing relatively freely if impacted upon This is in contrast to conventional ladder fenders which are rigidly bolted or otherwise fixed to the vertical quayside wall
In another embodiment of the invention, not illustrated, there is a single stringer passing vertically through a single fender structure similar to those described above, with a series of rungs through which the stringer is threaded centrally The rungs penetrate diametrically through the fender structure with free, outer ends of the rungs on either side of the fender structure serving as treads As in the previous embodiments, there is no bond between the fender structure and stringers and rungs of the ladder This embodiment is however less preferred since the freely projecting ends of the rungs are exposed to potential impact damage
In each of the embodiments described above, the stringers 12 of the ladder are in the form of stainless steel rods or bars It is however within the scope of the invention for these components to be provided by lengths of flexible, typicially stainless steel cable

Claims

1
A ladder fender comprising a ladder having one or more stringers and rungs transverse to the strιnger(s), and at least one hollow, tubular fender structure which is made of resilient material and which is penetrated transversely by the rungs of the ladder with no rigid connection between the fender structure and the ladder, whereby the fender structure is capable of at least limited resilient deformation relative to the ladder
2
A ladder fender according to claim 1 comprising a pair of parallel stringers each extending longitudinally through a fender structure, the rungs extending between the stringers through transverse openings in the fender structures
3
A ladder fender according to claim 1 comprising a pair of stringers located on opposite sides of a fender structure, the rungs extending transversely through the fender structure between the stringers
4
A ladder fender according to claim 1 comprising a single stringer extending longitudinally through a fender structure, the rungs having respective portions which penetrate the fender structure and extend to opposite sides of the stringer 5
A ladder fender according to any one of the preceding claims wherein each fender structure comprises a plurality of hollow cylindrical fender elements arranged coaxially in end to end relationship
6
A ladder fender according to claim 6 wherein the fender elements are held in coaxial alignment by means of resilient alignment elements each locating partially in one fender element and partially in an adjacent fender element
7
A ladder fender according to any one of the preceding claims wherein each stringer is threaded through openings in the rungs
A ladder fender according to any one of the preceding claims wherein each stringer has a suspension formation at an operatively upper end thereof by means of which it can be suspended from a supporting structure on a quay so as to hang vertically adjacent the quayside
9
A ladder fender according to claim 8 wherein the suspension formation is an eye
10
A ladder fender according to any one of the preceding claims wherein tread portions of the rungs, which are located outside the fender structures, are coated with rubber to provide a non-slip characteristic 1 1
A quayside ladder fender installation comprising a ladder fender according to any one of the preceding claims and a fixed supporting structure extending laterally over the quayside, the strιnger(s) of the ladder fender being suspended from the supporting structure with fender structure(s) lying adjacent an upright wall of the quayside, the suspension of the ladder fender from the supporting structure being such as to allow at least limited swinging movement of the ladder fender relative to the supporting structure
12
A ladder fender comprising a ladder and a resilient hollow tubular fender structure the ladder including at least one stringer relative to which a plurality of rungs extend transversely and which extends axially and with clearance in the hollow of the fender structure
13
A ladder fender substantially as herein described with reference to Figure 1 or Figure 3 of the accompanying drawings
14
A quayside ladder fender installation substantially as herein described with reference to Figure 2 of the accompanying drawings
PCT/IB2000/000904 1999-09-14 2000-07-05 Ladder fender WO2001020082A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54201/00A AU5420100A (en) 1999-09-14 2000-07-05 Ladder fender

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA995905 1999-09-14
ZA99/5905 1999-09-14

Publications (1)

Publication Number Publication Date
WO2001020082A1 true WO2001020082A1 (en) 2001-03-22

Family

ID=25587916

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2000/000904 WO2001020082A1 (en) 1999-09-14 2000-07-05 Ladder fender

Country Status (2)

Country Link
AU (1) AU5420100A (en)
WO (1) WO2001020082A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9365268B1 (en) 2012-07-16 2016-06-14 Bombardier Recreational Products Inc. Fender for a watercraft
WO2017151186A1 (en) * 2016-03-03 2017-09-08 Fender, Llc Fender with enhanced functionality

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE702434A (en) * 1967-08-08 1968-01-15
US4198919A (en) * 1978-06-02 1980-04-22 Oreco Iii, Inc. Bumper protection device
US4376419A (en) * 1981-07-08 1983-03-15 Sidewinder International, Ltd. Marine fender
GB2121732A (en) * 1982-06-08 1984-01-04 Bridgestone Tire Co Ltd Marine fender
US4494474A (en) * 1981-10-27 1985-01-22 Sumitomo Gomu Kogyo Kabushiki Kaisha Fender and life ladder in one
US4546856A (en) * 1981-08-15 1985-10-15 Sumitomo Gomu Kogyo Kabushiki Kaisha Fender beam and life ladder in one
EP0468190A1 (en) * 1990-07-24 1992-01-29 Martin T. Schydlo Step-ladder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE702434A (en) * 1967-08-08 1968-01-15
US4198919A (en) * 1978-06-02 1980-04-22 Oreco Iii, Inc. Bumper protection device
US4376419A (en) * 1981-07-08 1983-03-15 Sidewinder International, Ltd. Marine fender
US4546856A (en) * 1981-08-15 1985-10-15 Sumitomo Gomu Kogyo Kabushiki Kaisha Fender beam and life ladder in one
US4494474A (en) * 1981-10-27 1985-01-22 Sumitomo Gomu Kogyo Kabushiki Kaisha Fender and life ladder in one
GB2121732A (en) * 1982-06-08 1984-01-04 Bridgestone Tire Co Ltd Marine fender
EP0468190A1 (en) * 1990-07-24 1992-01-29 Martin T. Schydlo Step-ladder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9365268B1 (en) 2012-07-16 2016-06-14 Bombardier Recreational Products Inc. Fender for a watercraft
WO2017151186A1 (en) * 2016-03-03 2017-09-08 Fender, Llc Fender with enhanced functionality

Also Published As

Publication number Publication date
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