WO2004109051A1 - Echelle - Google Patents

Echelle Download PDF

Info

Publication number
WO2004109051A1
WO2004109051A1 PCT/AU2004/000754 AU2004000754W WO2004109051A1 WO 2004109051 A1 WO2004109051 A1 WO 2004109051A1 AU 2004000754 W AU2004000754 W AU 2004000754W WO 2004109051 A1 WO2004109051 A1 WO 2004109051A1
Authority
WO
WIPO (PCT)
Prior art keywords
ladder according
secondary support
support member
ladder
rung
Prior art date
Application number
PCT/AU2004/000754
Other languages
English (en)
Inventor
James Leslie Mann
Original Assignee
Prairie Enterprises Pty 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 Prairie Enterprises Pty Ltd filed Critical Prairie Enterprises Pty Ltd
Priority to NZ544143A priority Critical patent/NZ544143A/en
Priority to AU2004245579A priority patent/AU2004245579B2/en
Publication of WO2004109051A1 publication Critical patent/WO2004109051A1/fr

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
    • 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
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/38—Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • 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
    • E06C7/086—Connections between rungs or treads and longitudinal members with a connecting piece inserted in a hollow rung

Definitions

  • the present invention generally relates to ladders.
  • the invention is a ladder provided in a disassembled condition which may be assembled on site to the required length.
  • ladders are required to be tailored to the required length.
  • ladders of different sizes are required to accommodate the constraints dictated by the position of the manhole relative to the ground. These constraints additional to the constraints imposed by the various regulations and standards relating to ladders.
  • a particular problem with ladders for sewer systems is that by the time the civil works are completed, the length of the ladder ordered, whilst meeting the specification as designed, may no longer meet the dimensions of the sewer after construction. This may be due to various factors arising during civil construction which change the sewer structure as originally designed.
  • a typical method of fixing ladders relative to a manhole is to insert a ferrule into the manhole wall so that a step may be secured thereto.
  • a ferrule With the settling and movement of the earth surrounding the manhole, it is quite common for water and other contaminants to pass through the hole and into the sewer. This leakage is undesirable and generally may only be rectified by digging an access hole adjacent the manhole to allow a repairer to attend to the problem from outside the manhole.
  • the present invention provides a ladder comprising a plurality of primary support members releasably supported in spaced apart relation by at least one elongate element, the at least one elongate element comprising a plurality of secondary support members adapted to slidingly engage each other in an end to end relationship to form the at least one elongate element.
  • each, secondary support member is adapted to receive at least one of the plurality of primary support members.
  • each elongate element defines a side of the ladder and supports the plurality of primary support members therebetween.
  • each primary support element defines a rung to support a person using the ladder.
  • each secondary support member supports one end of one rung such that the length of each secondary support member determines the distance between adjacent rungs.
  • Each secondary support member may provide an inner face and an outer face.
  • Each secondary support member may comprise an elongate intermediate portion, a first end portion located at one end of the intermediate portion and a second end portion located at the other end.
  • the first end portion may comprise a neck portion extending from the intermediate portion, and a head portion extending from the neck portion and having a recessed portion therein adapted to releasably receive the end of the rung.
  • the neck portion may extend substantially parallel to the longitudinal axis of the secondary support member.
  • the head portion may then extend from the neck portion, sloping away from the longitudinal axis and towards the intermediate portion.
  • the head portion may then extend away from the intermediate portion and taper towards the longitudinal axis of the secondary support member before terminating at a first edge substantially perpendicular to the longitudinal axis.
  • the recessed portion extends inwardly from the inner face and terminates a predetermined distance from the outer face, such that it does not go beyond the outer face.
  • the recessed portion may be open along the first edge of the first end portion such that an end of a rung is slidingly receivable in the recessed portion in a direction parallel with the longitudinal axis of the secondary support member.
  • the second end portion comprises a cut out section.
  • the cut out section may be contoured to slidingly receive the first end portion of an adjacent secondary support member in a direction transverse to the longitudinal axis, and providing a snug fit between adjacent secondary support members.
  • the second end portion also comprises a projection extending into the cut out section.
  • the projection may extend a predetermined distance along the longitudinal axis of the secondary support member.
  • the projection extends in the transverse direction from the inner surface of the secondary support member and terminates a predetermined distance from the outer face. Preferable this predetermined distance is substantially the same as the depth of the recessed portion located in the first end portion. Hence when two secondary support members are coupled together, the projection is received within the recessed portion of the other secondary support member.
  • each end of each rung may have a slot in an upper surface.
  • the slot may extend inwardly a predetermined distance from the end of the rung substantially parallel to the longitudinal axis of the rung.
  • the slot may be adapted to receive the projection of the second end portion of the secondary support member.
  • the ladder also comprises a plurality of locking means which, when assembled, prevents adjacent secondary support members unintentionally disengaging from each other and releasing the primary support member.
  • Each locking means may be received in each end of each rung to prevent adjacent secondary support member disengaging.
  • each end of each rung also comprises an aperture in communication with the slot.
  • the aperture extends from the slot through to the underside of the rung.
  • Each locking means may be adapted to be releasably retained in the aperture.
  • the locking means may comprise a tab section which is received in the slot and abuts the projection of the second end portion in the secondary support member, preventing it from disengaging the first end portion of the adjacent secondary support member when in an assembled condition.
  • the locking means may comprise at least one latch extending laterally from the tab section.
  • the at least one latch is resiliently flexible in a transverse direction.
  • the at least one latch When assembled, the at least one latch may engage an edge of the aperture to releasably retain the locking means thereto.
  • the locking means comprises two latches.
  • Figure 1 is a cross sectional view of a section of an assembled ladder
  • Figure 2 is a side view of a secondary support member from the inner face
  • Figure 3 is a cross-sectional side view down a longitudinal axis of the secondary support member
  • Figure 4 is a view similar to Figure 2 but from the outer face;
  • Figure 5 is an end view of a first end portion of the secondary support member;
  • Figure 6 is an end view of a second end portion of the secondary support member
  • Figure 7 is a plan view of an end section of a rung
  • Figure 8 is a cross-sectional side view of the end section of the rung
  • Figure 9 is a front view of a locking means
  • Figure 10 shows two secondary support members in sliding engagement, minus a rung
  • Figure 11 is a perspective view of the end of a rung received in the first end portion of the secondary support member
  • Figure 12 is a perspective view of an adjacent secondary support member slidingly engaging the partly assembled section shown in figure 11 ;
  • Figure 13 is a perspective view of the section shown in figure 12 assembled
  • Figure 14 is a view similar to figure 13 with a locking means being inserted in the rung;
  • Figure 15 is a perspective view of a completely assembled section of the ladder
  • Figure 16 is a perspective view from underneath a section of the assembled ladder. Best Mode(s) for Carrying Out the Invention
  • the invention according to an embodiment is in the form of a ladder 11 comprising two elongate elements 13 which support a plurality of primary support members in the form of rungs 15 therebetween.
  • Each elongate element 13 comprises a plurality of secondary support members 17 which slidingly engage each other in an end to end relationship to provide an elongate element 13, the length of which is governed by the number of secondary support members 17 used.
  • each secondary support member 17 comprises an inner surface 19, an outer surface 21 , a first end portion 23, a second end portion 25 and an intermediate portion 27.
  • the first end portion 23 comprises a neck portion 29 which extends from the intermediate portion 27 along a longitudinal axis 31 of the secondary support member 17.
  • the first end portion 23 also comprises a head portion 33 extending from the neck portion 29.
  • the head portion 23 initially extends outwardly from the neck portion 29 in a direction towards the intermediate portion 27 to provide angled shoulders 35 before extending away from the intermediate portion 27 and tapering towards the longitudinal axis 31 to terminate at a first edge 37.
  • the head portion 33 also comprises a recessed portion 39 having an opening 41 along the first edge 37 and extending transversely from the inner surface 19 and ending a predetermined distance from the outer surface 21.
  • the second end portion 25 comprises a cut-out section 43 which mirrors the profile of the first end section 23 such that the first end portion 23 may be slidingly received over the second end portion 25 of an adjacent secondary support member 17 such that there is a snug fit between adjacent secondary support members 17 when coupled together, as can be seen in figure 10.
  • the second end portion 25 also comprises a projection 45 extending into the cutout section 43 along the longitudinal axis 31. The projection 45 extends from the inner surface 19 and terminates substantially the same distance from the outer surface 21 as the recessed portion 39 of the first end section 23, for reasons which will be detailed below.
  • each end 47 of each rung 15 is adapted to be slidingly received in the recessed portion 39 of the first end portion 23.
  • Each end 47 of each rung 15 comprises a slot 49 extending from the end 47 and terminating a predetermined distance therefrom. Each end 47 also comprises an aperture 51 in communication with the slot 49 and a bottom edge 53 of each rung 15.
  • the ladder 11 also comprises locking means 55.
  • the locking means 55 comprises a tab 57 and two latches 59 resiliently displaceable.
  • the assembly of the ladder 11 from the component parts is depicted in figures 11 to 16.
  • the first step in assembling the ladder 11 is to place each end 47 of the rung 15 in the recessed portion 39 of the first end portion 23 of a secondary support member 17b, such that it is slidingly received in a direction parallel to the longitudinal axis 31.
  • the second end portion 25 of a further secondary support member 17a is caused to slidingly engage the first end portion 23 of the secondary support member 17b, as best shown in figure 12.
  • This engagement is in a direction transverse to the longitudinal axis 31 and is such that the second end portion moves in a direction from the inner surface 19 of the secondary support member 17b towards the outer surface 21.
  • the projection 45 is aligned and received in the slot 49 of the rung 15.
  • the locking means 55 When adjacent secondary support members 17 are in engagement the locking means 55 is inserted into the slot 49 such that the latches 59 are received in the aperture 51 , as best shown in figures 14, 15 and 16. As the locking means 55 is inserted into the aperture 51 the latches 59 are caused to move inwardly until they reach the end of the aperture 51 and engage the sides of the countersunk section, to be releasably retained therein.
  • the latches 59 To disassemble the ladder the latches 59 must be pushed towards each other such that the locking means 55 can be released from the aperture 51 and slot 49. This will allow the second end portion 25 to be slidingly released from the first end portion 23 of the adjacent secondary support member 17b allowing the release of the end 47 of the rung 15.
  • the secondary support members are constructed so as to provide a ladder of light construction whilst still providing the same, or greater strength and quality characteristics of ladders found in conventional assemblies.
  • the ladder components may be made from any suitable material which are selected depending on the application the ladder is to be used.
  • the ladder may be made of a non-conductive material for electrical applications or may be made of a non-corrosive material for the use in areas where corrosion is a factor.
  • Each elongate element 13 may have at its respective ends a slightly modified secondary support member whereby, for instance, either the first end portion, in the case of the secondary support member at the top end of the elongate element, or the second end portion, in the case of the secondary support member at the bottom end of the elongate element, is not present. This provides the elongate element with structurally sound ends for positioning on or against a surface.

Landscapes

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

Abstract

Echelle (11) composée d'une pluralité d'éléments de support primaires sous forme d'échelons (15) supportés de façon amovible par au moins un élément allongé (13) et éloignés les uns des autres. Cet élément allongé (13) comprend une pluralité d'éléments de support secondaires (17) conçus pour s'accoupler bout à bout de façon coulissante, de manière à constituer cet élément allongé (13).
PCT/AU2004/000754 2003-06-04 2004-06-04 Echelle WO2004109051A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NZ544143A NZ544143A (en) 2003-06-04 2004-06-04 Ladder
AU2004245579A AU2004245579B2 (en) 2003-06-04 2004-06-04 Ladder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2003902799 2003-06-04
AU2003902799A AU2003902799A0 (en) 2003-06-04 2003-06-04 Ladder

Publications (1)

Publication Number Publication Date
WO2004109051A1 true WO2004109051A1 (fr) 2004-12-16

Family

ID=31953840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/000754 WO2004109051A1 (fr) 2003-06-04 2004-06-04 Echelle

Country Status (3)

Country Link
AU (1) AU2003902799A0 (fr)
NZ (1) NZ544143A (fr)
WO (1) WO2004109051A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045019B1 (fr) * 1980-07-25 1983-11-02 Otto Schürch A.G. Armaturen für den Schachtbau Echelle démontable, particulièrement échelle pour puits de mine
EP0327323A1 (fr) * 1988-02-04 1989-08-09 Tristian Guy Melland Echelles
US4884659A (en) * 1988-11-30 1989-12-05 Patrick Chao Collapsible ladder
WO1997024506A1 (fr) * 1995-12-29 1997-07-10 Söll Gmbh Dispositif pour assembler deux elements d'echelle a un seul montant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045019B1 (fr) * 1980-07-25 1983-11-02 Otto Schürch A.G. Armaturen für den Schachtbau Echelle démontable, particulièrement échelle pour puits de mine
EP0327323A1 (fr) * 1988-02-04 1989-08-09 Tristian Guy Melland Echelles
US4884659A (en) * 1988-11-30 1989-12-05 Patrick Chao Collapsible ladder
WO1997024506A1 (fr) * 1995-12-29 1997-07-10 Söll Gmbh Dispositif pour assembler deux elements d'echelle a un seul montant

Also Published As

Publication number Publication date
NZ544143A (en) 2009-02-28
AU2003902799A0 (en) 2003-06-19

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