EP0327323A1 - Leiter - Google Patents

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Publication number
EP0327323A1
EP0327323A1 EP89300947A EP89300947A EP0327323A1 EP 0327323 A1 EP0327323 A1 EP 0327323A1 EP 89300947 A EP89300947 A EP 89300947A EP 89300947 A EP89300947 A EP 89300947A EP 0327323 A1 EP0327323 A1 EP 0327323A1
Authority
EP
European Patent Office
Prior art keywords
stringer sections
modular ladder
modular
elements
stringer
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.)
Withdrawn
Application number
EP89300947A
Other languages
English (en)
French (fr)
Inventor
Tristian Guy Melland
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0327323A1 publication Critical patent/EP0327323A1/de
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • THIS invention relates to ladders.
  • One kind of known ladder is of fixed length and has no facility for increasing or decreasing that length.
  • Other known ladders are of telescopic construction.
  • the present invention seeks to provide a solution to this problem.
  • the invention provides a modular ladder element comprising :
  • the engagement means are in the form of slide formations which are slidably engageable with the slide formations of the stringer sections of the like modular elements upon relative movement between the modular ladder elements taking place in a direction transverse both to the stringer sections and to the step or steps.
  • the slide formations comprise alternating headed ribs and undercut grooves in which the headed ribs are slide fits.
  • the modular ladder element of the invention may also include stop means for limiting relative slideways movement between the slide formations of the modular ladder element and those of another like modular ladder element.
  • the means for releasably preventing disengagement of the engagement means comprises resilient tongues and recesses in which such tongues make clip fits.
  • a hand-engageable tab is provided for each resilient tongue for the purposes of releasing the tongue from a recess in which it is clipped.
  • the invention extends to a one-piece moulded modular ladder element which comprises a pair of parallel stringer sections spaced apart from and joined to one another by means of a single, central step spanning rigidly and transversely between the stringer sections, and engagement means at the ends stringer sections by means of which they can be connected releasably in end-to-end alignment with the stringer sections of other like modular ladder elements, thereby to form a ladder composed of like modular ladder elements.
  • the invention also extends to a ladder made up of modular ladder elements as specified above.
  • a modular ladder element 10 according to the present invention has spaced, parallel stringer sections 12A and 12B and a single rung or step 14 which spans rigidly between the stringer sections.
  • the step 14 is at right angles to the stringer sections, with the result that the element 10 has an H-shape when viewed in front elevation (see Figure 4).
  • the element 10 is formed as a unitary plastics moulding.
  • Each stringer section 12A and 12B has a channel-shape in cross-section.
  • the channel-shape is defined by a web 16 and spaced, parallel flanges 18 and 20.
  • the web 16 is formed with triangular apertures 22 in the interests of material savings.
  • the edges of the apertures 22 are ribbed towards the outside of the element 10 as indicated by the numeral 24.
  • Angled webs 26 extend between the flanges 18 and 20 to rigidify the structure. Further rigidity is provided by transverse end flanges 28.
  • the stringer sections 12A and 12B are identical mirror images of to one another.
  • Each flange 28 carries engagement means, in this case in the form of slide formations indicated generally with the numeral 30.
  • the slide formations 30 are identical mirror images of one another and are made up of alternating headed ribs 32 and undercut grooves 34. The ribs and grooves extend in a direction at right angles to the flanges 18 and 20.
  • one of the ribs carries a tongue which has an enlarged head 35 and a stem portion 37 which has inherent resilience because of its slenderness and which is defined by a slot 39.
  • a tab 36 projects laterally from each tongue and is movable by hand in the direction of the arrow 38 ( Figure 1) to flex the tongue in the same direction.
  • each stringer section there is a recess 40 (see the partially cut away portion of Figure 5) which is situated at the base of a groove 34 and which is complemental in shape to the head 35 of a tongue.
  • the single step 14 has generally a V-shape in cross-section, as will be apparent from the cross-section of Figure 5, and it has inclined, transverse, internal webs 54 providing reinforcement.
  • the extreme ends of the step 14 are outwardly belled at 56 where they meet the stringer sections 12A and 12B, the belled portions providing added strength at the locations where the greatest bending moments and shear forces will take place in use of the element 10.
  • the step 14 is perfectly symmetrical about a central plane 58 ( Figure 5).
  • Treads 60 are inclined to the central plane at an acute angle.
  • the treads 60 may be formed with grooves, or may be otherwise roughened, to increase the grip which the foot of a wearer will have on the step.
  • the acute angle is chosen so that the treads 60 will be substantially horizontal when a ladder, such as that of Figure 3, is assembled and inclined against a wall at an appropriately stable angle, typically 20° to the vertical. Of course, when the ladder is vertical, the treads 60 are inclined to the horizontal.
  • the treads 60 meet, at chamfered corners 62, with flat portions 64 which are contained in planes normal to the planes of the webs 16 of the stringer sections.
  • the elements are brought together with their stringer sections adjacent one another as illustrated in Figure 2.
  • the elements are then moved relatively to one another in a direction which is transverse both to the stringer sections 12A and 12B and to the step 14, as indicated by the arrows 50 in Figure 2.
  • the headed ribs 34 of the stringer sections of one element 10 enter the undercut grooves 34 of the stringer sections of the other element 10 in a slide fit. Slideways movement in the direction of the arrows 50 is continued until such time as the ribs of one element abut a flange 48 of the other element, at which stage the elements are correctly mated with their stringer sections 12A and 12B properly aligned.
  • the flange 48 thus serves as a stop to prevent slideways movement past the condition of correct alignment.
  • a series of modular elements may be mated end-to-end in this way to form a ladder as seen partially in Figure 3.
  • a major advantage of the illustrated modular elements is the fact that they can, when the ladder is taken apart, be conveyed compactly in, say, the boot of a passenger car.
  • a person needing a ladder only has to acquire as many modular elements as necessary to create the required length of ladder. If, at a later stage, a longer ladder is required for a particular job, a few more elements may be acquired. When the ladder is not in use, it can be taken apart with ease and the modular elements can be stored compactly for re-use when required.
  • the tabs 36 are used to release the tongues 35 from the recesses 40, this being achieved merely by pressing the tabs manually in the direction 38. Once the tongues are clear of the recesses, the modular ladder elements 10 can be separated by a relative sliding movement in a direction opposite to the arrows 50.
  • each assembled stringer which has ribs and grooves similar to those of the stringer sections to enable them to be connected to the lower end of each stringer section of the bottom element 10 in the ladder.
  • the footing has a surface adapted to grip well on the ground or other supporting surface on which the ladder rests in use.
  • Another accessory is a hinge attachable rib-and-groove fashion to the upper ends of the stringer sections of the top elements 10 of two different ladders, as shown schematically at 70 in Figure 7.
  • the result would be a step-ladder having relatively inclined ladders 72 and 74.
  • Straps 76, or centrally articulated tie members, span between the ladders 72 and 74 with their ends attached to the stringer sections.
  • Figure 8 shows schematically how two ladders 78 and 80 can be mated telescopically with one another to permit ready extension in the longitudinal direction.
  • a bracket 82 is arranged to embrace side-by-side flanges of the stringer sections of the two ladders, with the depressions 52 combining with one another to form a rectangular cavity.
  • the bracket 82 is fixed relative to one flange by means of a bolt 84 passing through aligned holes in the bracket and in the flange, and a nut 86.
  • the flange holes are illustrated at 60 in Figure 1. This arrangement permits one flange to slide longitudinally relative to the other for extension purposes.
  • Figure 8 only illustrates the situation on one side of the ladder it will be appreciated that a similar arrangement is provided on the opposite side as well.
  • the depressions 52 are not useful solely for the above-described purpose of permitting a telescoping ladder.
  • Various kinds of attachments can be attached slidably to the ladder.
  • a support platform or container for tools, building materials and the like could be attached slidably to the ladder.
  • brackets 62 such as those seen in Figure 1 could be engaged with the stringer sections in sliding fashion, the relevant platform, container or other attachment being carried by the brackets 62.
  • the brackets could be anchored at chosen elevations on the ladder.
  • non-sliding fixtures such as safety hoops, support platforms or the like can be connected to the stringer sections at chosen elevations using the holes 60.
  • a single step is preferable in that the overall length of the modular element will be less than an equivalent modular element having more than one step and this in turn means that the modular element can be more easily packed and handled.
  • a single step enables the length of an assembled ladder to be increased in single step increments.
  • Figures 9 to 15 illustrate diagrammatically the versatility of the illustrated modular element.
  • Figure 9 shows a typical assembled ladder while
  • Figure 10 shows a typical extension ladder, the extension facility being provided in the manner described in relation to Figure 8, the sliding brackets 82 being omitted in the interests of clarity.
  • Figure 11 depicts a trestle ladder in which a support platform is supported at an elevated position using the connection features described above in relation to Figure 8. Once again, the actual brackets which are connected to the ladders and which are used to support the platform are omitted.
  • Figure 12 shows a stair ladder which enables a worker to work on a staircase. Naturally, this kind of application is only permitted by the modular nature of the elements 10 which allows the user to create assembled ladders to suit the inclination of the staircase.
  • Figure 13 shows a step stool in which a support platform is provided.
  • Figure 14 shows an assembled ladder in which safety hoops, as referred to previously, are provided in the interests of user safety.
  • the actual brackets and hinges used to achieve the various connections are omitted.
  • the slide formations 30 at the ends of the stringer sections could be so arranged that appropriate connections can be made to other modular ladder elements irrespective of which way round the elements are.
  • the step 14 is situated centrally along the lengths of the stringer sections so that the step spacing in an assembled ladder remains constant irrespective of which way round the elements are placed relative to one another.
EP89300947A 1988-02-04 1989-02-01 Leiter Withdrawn EP0327323A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8802458 1988-02-04
GB888802458A GB8802458D0 (en) 1988-02-04 1988-02-04 Ladders

Publications (1)

Publication Number Publication Date
EP0327323A1 true EP0327323A1 (de) 1989-08-09

Family

ID=10631035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300947A Withdrawn EP0327323A1 (de) 1988-02-04 1989-02-01 Leiter

Country Status (6)

Country Link
EP (1) EP0327323A1 (de)
JP (1) JPH01310085A (de)
AU (1) AU2893889A (de)
GB (1) GB8802458D0 (de)
PT (1) PT89627A (de)
ZA (1) ZA89756B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468190A1 (de) * 1990-07-24 1992-01-29 Martin T. Schydlo Trittleiter
FR2716491A1 (fr) * 1994-02-18 1995-08-25 Rey Henri Echelle, notamment pour travaux domestiques.
WO2004109051A1 (en) * 2003-06-04 2004-12-16 Prairie Enterprises Pty Ltd Ladder
FR2884854A1 (fr) * 2005-04-26 2006-10-27 Sarl Creastuce Sarl Element d'echelle modulaire
AU2004245579B2 (en) * 2003-06-04 2009-04-02 Industrial Steps and Ladders Pty Ltd Ladder
WO2011003403A2 (de) 2009-07-10 2011-01-13 Poly-Tools Bennewart Gmbh Baukastenstecksystem
EP2397648A1 (de) * 2010-06-17 2011-12-21 Alpha Composites Limited Von Hand tragbare Strukturvorrichtung
WO2013032887A1 (en) * 2011-08-29 2013-03-07 Basf Se Ladder
GB2508640A (en) * 2012-12-06 2014-06-11 John Charles Warburton Apparatus and Method for retrieving injured person from confined space

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5985530B2 (ja) * 2014-03-28 2016-09-06 株式会社アールシーコア はしご付き棚

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053673A (de) * 1900-01-01
US2788167A (en) * 1953-07-13 1957-04-09 G B Haynes Molded ladder
DE2547637A1 (de) * 1975-10-24 1977-04-28 Wolfgang Naumann Daemmplatte aus kunststoffschaum
GB1508436A (en) * 1975-03-13 1978-04-26 Hickman Designs Ltd Ladders
DE3442710A1 (de) * 1984-11-23 1986-05-28 Dieter 4000 Düsseldorf Haber Aus einzel-bauteilen mittels steckverbindungen zusammengesetzte mehrzweckleiter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053673A (de) * 1900-01-01
US2788167A (en) * 1953-07-13 1957-04-09 G B Haynes Molded ladder
GB1508436A (en) * 1975-03-13 1978-04-26 Hickman Designs Ltd Ladders
DE2547637A1 (de) * 1975-10-24 1977-04-28 Wolfgang Naumann Daemmplatte aus kunststoffschaum
DE3442710A1 (de) * 1984-11-23 1986-05-28 Dieter 4000 Düsseldorf Haber Aus einzel-bauteilen mittels steckverbindungen zusammengesetzte mehrzweckleiter

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0468190A1 (de) * 1990-07-24 1992-01-29 Martin T. Schydlo Trittleiter
FR2716491A1 (fr) * 1994-02-18 1995-08-25 Rey Henri Echelle, notamment pour travaux domestiques.
WO2004109051A1 (en) * 2003-06-04 2004-12-16 Prairie Enterprises Pty Ltd Ladder
AU2004245579B2 (en) * 2003-06-04 2009-04-02 Industrial Steps and Ladders Pty Ltd Ladder
FR2884854A1 (fr) * 2005-04-26 2006-10-27 Sarl Creastuce Sarl Element d'echelle modulaire
WO2006114503A1 (fr) * 2005-04-26 2006-11-02 Societe Creastuce Element d'echelle modulaire
WO2011003403A2 (de) 2009-07-10 2011-01-13 Poly-Tools Bennewart Gmbh Baukastenstecksystem
WO2011003403A3 (de) * 2009-07-10 2011-03-10 Poly-Tools Bennewart Gmbh Baukastenstecksystem
EP2397648A1 (de) * 2010-06-17 2011-12-21 Alpha Composites Limited Von Hand tragbare Strukturvorrichtung
WO2011157977A1 (en) * 2010-06-17 2011-12-22 Alpha Composites Limited Manually portable structural apparatus
WO2013032887A1 (en) * 2011-08-29 2013-03-07 Basf Se Ladder
CN103874820A (zh) * 2011-08-29 2014-06-18 巴斯夫欧洲公司 梯子
EP2751367A4 (de) * 2011-08-29 2015-05-06 Basf Se Leiter
US9663991B2 (en) 2011-08-29 2017-05-30 Basf Se Ladder
GB2508640A (en) * 2012-12-06 2014-06-11 John Charles Warburton Apparatus and Method for retrieving injured person from confined space

Also Published As

Publication number Publication date
JPH01310085A (ja) 1989-12-14
ZA89756B (en) 1989-10-25
GB8802458D0 (en) 1988-03-02
PT89627A (pt) 1989-10-04
AU2893889A (en) 1989-08-10

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