EP1079062A2 - Stehleiter - Google Patents

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Publication number
EP1079062A2
EP1079062A2 EP00307287A EP00307287A EP1079062A2 EP 1079062 A2 EP1079062 A2 EP 1079062A2 EP 00307287 A EP00307287 A EP 00307287A EP 00307287 A EP00307287 A EP 00307287A EP 1079062 A2 EP1079062 A2 EP 1079062A2
Authority
EP
European Patent Office
Prior art keywords
legs
step ladder
assembly
support member
rung
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Withdrawn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
EP00307287A
Other languages
English (en)
French (fr)
Other versions
EP1079062A3 (de
Inventor
Bryan Philips
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.)
All Terrain Ladder Co Ltd
Original Assignee
All Terrain Ladder Co 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 All Terrain Ladder Co Ltd filed Critical All Terrain Ladder Co Ltd
Publication of EP1079062A2 publication Critical patent/EP1079062A2/de
Publication of EP1079062A3 publication Critical patent/EP1079062A3/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Withdrawn legal-status Critical Current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
    • 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
    • E06C1/382—Tripod ladders
    • 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
    • E06C1/39—Ladders having platforms; Ladders changeable into platforms
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/42—Ladder feet; Supports therefor
    • E06C7/44—Means for mounting ladders on uneven ground

Definitions

  • This invention relates to a step ladder.
  • step ladders have two support legs which are usually divergent away from a top platform and a pair of uprights, between which are arranged the rungs of the step ladder, the uprights also being connected to the top platform.
  • the uprights and the support legs are in contact with the ground when the step ladder is erected for use.
  • This conventional step ladder arrangement has the inherent problem of being unstable when placed upon rough or uneven ground where only three of the four possible points of contact do actually contact the ground.
  • a step ladder including a rung assembly and first and second legs and a single support member depending from the rung assembly such that, in use, an end of the support member and one end of each of the first and second legs define the contact points upon which the ladder rests.
  • the step ladder is foldable for storage.
  • At least one of said support member and said first and second legs terminates in a foot assembly adjustable in position relative to the respective leg or support member.
  • tie means capable of limiting the separation of the rung assembly and the legs.
  • said tie means includes a tie between said legs.
  • said tie means includes ties of adjustable length.
  • the legs and the rung assembly lie within the area defined by the platform when the step ladder is folded.
  • each of the legs and said support member has an adjustable foot assembly
  • the or each adjustable foot assembly has a projection slidably received in its respective leg or support member and retained in a selected position relative thereto by a spring loaded peg extending from the projection through a selected one of a longitudinal array of apertures in said leg or support member.
  • the step ladder is made of mild steel.
  • the step ladder may be made of either stainless steel or aluminium.
  • the step ladder 10 is constructed from mild steel components which are treated before or after assembly to provide corrosion protection and to enhance the visual appeal of the step ladder. It is to be understood that other materials, for example stainless steel, aluminium and aluminium alloys, may prove suitable for the construction of some all of the step ladder components.
  • the step ladder includes a rung assembly 12; elongate support legs 14,16 formed from tubular material of circular cross-section; a rectangular platform 18 and a handrail 19.
  • the rung assembly 12 comprises a pair of elongate uprights 20,22, formed from tubular material of circular cross-section, a plurality of rungs 24 and an elongate intermediate support 26 also formed from tubular material of circular cross-section similar to that of the legs 14, 16.
  • the uprights 20,22 are parallel and support the rungs 24 at regular intervals therebetween, the rungs being secured at their ends to the uprights by welding.
  • the support 26 extends parallel to the uprights 20,22, projecting beyond the uprights 20,22 at the lower end thereof and is secured to the rungs 24 by welding midway between the uprights 20,22.
  • a foot 28 extends from the lower end of the support 26.
  • the uprights 20,22 have welded thereto respective lugs (not shown) which project outwardly from the uprights and are pivotally connected by respective pivot pins to respective corners of the platform 18.
  • the upper end of the support 26 is pivotally connected by an appropriate pivot pin to a bracket (not shown) welded beneath the platform 18 between the uprights 20,22, such that the pivot axis of the support 26 and the pivot axes of the uprights 20,22 are coextensive and lie along one edge of, and are contained within, the thickness of the platform 18.
  • Each of the legs 14,16 receives a respective foot 31,32 at its lower end.
  • the upper end of each of the legs 14,16 is pivotally connected to the platform 18 at the corners thereof opposite to the uprights 20,22.
  • the pivot axes of the legs 14,16 are disposed at an angle of 45° relative to the pivot axis of the uprights 20,22 and support 26, so that the legs can splay outwardly in use.
  • the underside of the platform 18 has respective channel sections 34 welded therein for receiving the ends of the legs 14,16.
  • Each section 34 has an inner surface 36 against which the leg abuts when the step ladder is erect, to define the fully splayed state.
  • Each leg has a pair of concentric circular holes 38 in opposite sidewalls and seats inside its respective section 34.
  • a threaded pivot bolt 40 passes through holes in the side walls of the respective channel section 34 and the holes 38 to pivotally secure the respective leg to the platform 18.
  • Each bolt 40 is locked in position by a nut 42.
  • the pivot axis of the uprights 20,22, and the support 26 is coplanar with pivot axes of the legs 14,16, the pivot axes of the legs 14,16 being disposed at an angle of 90° to each other.
  • the splay of the legs 14, 16 and the support member 26 governs the area occupied by the step ladder and the "in use" height of the platform 18 for a given leg length. It is possible, through the use of stays or ties of adjustable length to provide a step ladder where the splay is adjustable, and such an arrangement is within the scope of this invention. However in the embodiment described herein the splay of the legs 14, 16 and the support 26 in the erected configuration of the step ladder is fixed by a folding tie 44 linking the legs 14, 16 and similar ties 46, 48 linking the support 26 and the legs 14 and 16 respectively.
  • Each of the legs 14,16 and the support 26 has welded thereto adjacent its mid-point, a bracket 75, 76, 77 each defining a pair of outwardly extending lugs indicated in Figure 6 by the suffix a and b respectively.
  • Each tie 44, 46, 48 is as depicted in Figure 7 and comprises two arms 78, 79 formed from substantially equal lengths of strip material overlapped at one end and interconnected for pivotal movement at right angles to the plane of the strip material by a bolt 80 and self-locking nut passing through the overlapping regions of the arms. As the ties 44, 46 ,48 are so similar only the tie 44 is shown in Figure 7.
  • the free end of the arm 78 of tie 44 is pivotally connected to the lug 75b by a bolt 81 and self-locking nut passing through overlapping regions of the arm and the lug.
  • the free end of the arm 79 of tie 44 is pivotally connected to the lug 76a by a bolt 82 and self-locking nut passing through the overlapping regions of the arm and the lug, the bolts 80, 81, and 82 being parallel.
  • the tie 46 similarly interconnects the lugs 75a and 77b while the tie 48 similarly interconnects the lugs 76b and 77a.
  • the pivotal connection of the arms of the ties 44, 46, 48 to each other and to the respective lugs allows the folding movement of the ties necessary to permit hinging of the legs 14, 16 and the support 26 relative to the platform 18 to move the step ladder between a storage configuration and an erected configuration.
  • the weight of the step ladder and any user will splay the legs and support 26 to the maximum amount such that the arms of the ties are aligned.
  • the arm 78 of each tie has a laterally extending flange 78a along its upper edge in and adjacent the region of overlap with the arm 79, the flange engaging the upper edge of the arm 79 when the arms are aligned (the position of maximum length of the tie).
  • the flange 78a can be integral with the arm or can be a strip welded thereto.
  • the spread of the legs 14, 16 at ground level should be about 1.8m and the spread of the support 26 to the legs 14, 16 at ground level should be about 2.3m.
  • the equivalent spread should be about 1.3m and 1.65m.
  • the handrail 19 comprises a vertical substantially U-shaped portion 50 and two angled portions 52,54.
  • the U-shaped portion 50 projects upwardly from, and spans, the platform 18 and is fixed thereto adjacent the pivot points of the legs 14,16.
  • the angled portions 52,54 depend from near the top of the U-shaped portion 50, being fixed to the platform 18 adjacent the pivot points of the uprights 20,22.
  • each of the legs 14, 16 and the support 26 has a foot assembly 28, 31, 32 at it lower end through which contact with the ground is made.
  • Each of the feet 28,31,32 is substantially identical and so only one (the assembly 32 of leg 16) will be described.
  • the foot assembly 32 as shown in Figure 5, comprises a flat square plate 63 with an inclined hollow projection 64 upstanding from the midpoint thereof.
  • the projection 64 is welded to the plate 63 and comprises a length of tubular material of a diameter such that it is received in the end region of the leg 16 as a sliding fit.
  • An aperture 56 in the wall of the projection 64 can be aligned, by sliding movement of the projection 64 within the leg 16, with any one of a longitudinal array of similar apertures 58 in the wall of the leg 16 such that a spring loaded peg 60 carried by the projection 64 can extend through the aligned apertures 56, 58 to lock the projection 64 in a selected position of extension relative to the leg 16.
  • the peg 60 is carried at the mid point of a spring strip 61 housed within the projection 64, the end regions of the strip 61 being bent back at 62 to engage the opposite inner wall of the projection 64 and thus to urge the peg 60 to project through the aligned apertures.
  • the user can alter the amount by which the foot assembly extends from the leg by depressing the peg 60 against the spring 61, 62 to free the peg 60 from the aperture 58 and so free the projection 64 for sliding movement relative to the leg 16 to align the aperture 56 and peg 60 with a different aperture 58.
  • Each foot assembly 28,31,32 may be independently distanced from the end of the respective leg 14,16 and support 26 in the manner described above in relation to the foot assembly 32 and leg 16, in order to accommodate the use of the step ladder on uneven ground.
  • the foot assemblies 28,31,32 typically have a length (height) adjustment range of 300mm. While the spring pressed peg 60 is the preferred adjustment device it is to be recognised that a simple pin passing through transverse holes in the components could be used if desired.
  • any of the foot assemblies 28,31,32 can be secured to the ground upon which it lies (not shown) by the use of a location pin 65 which, in use, is driven through an aperture 66 in the plate 63 into the ground.
  • a castor assembly can be added to each foot assembly if desired in order, for example, to facilitate moving the erected step ladder on smooth floors.
  • a nut 72 is fixed to the upper surface of the plate 63 within the projection 64.
  • a hole 74 in the plate 63 is aligned with the threaded bore of the nut 72 so as to receive, in use, a threaded shaft associated with the castor.
  • the castor is typically a swivel castor with a locking or braking mechanism.
  • the rung assembly 12 may be directly pivotally connected to the legs 14,16.
  • the wall 36 of the channel section 34 limits movement of the legs 14, 16 it would be possible to provide ties only between the legs 14, 16 and the rung assembly 22, but it is preferred to provide also the tie 44 between the legs 14, 16.
  • the lowest rung of the rung assembly may be narrower than the other rungs.
  • the narrow rung is centred on the axis of the rung assembly, thus gives increased stability as an initial load when a user climbs on the rung assembly will lie along the central axis of the support.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP00307287A 1999-08-25 2000-08-24 Stehleiter Withdrawn EP1079062A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9919991.1A GB9919991D0 (en) 1999-08-25 1999-08-25 Step ladder
GB9919991 1999-08-25

Publications (2)

Publication Number Publication Date
EP1079062A2 true EP1079062A2 (de) 2001-02-28
EP1079062A3 EP1079062A3 (de) 2001-06-13

Family

ID=10859696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00307287A Withdrawn EP1079062A3 (de) 1999-08-25 2000-08-24 Stehleiter

Country Status (2)

Country Link
EP (1) EP1079062A3 (de)
GB (1) GB9919991D0 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014132733A1 (ja) * 2013-02-26 2014-09-04 Aoi Tokuo 脚立
CN105317369A (zh) * 2015-10-08 2016-02-10 王广宁 采摘梯
USD757959S1 (en) 2015-04-28 2016-05-31 Tokuo AOI Stepladder
USD758615S1 (en) 2015-04-28 2016-06-07 Tokuo AOI Stepladder
USD761442S1 (en) 2014-07-10 2016-07-12 Tokuo AOI Stepladder
USD765269S1 (en) 2015-04-28 2016-08-30 Tokuo AOI Stepladder
US9534443B1 (en) 2011-12-27 2017-01-03 Robert C. Bogart Ladder and related methods
WO2023144429A1 (es) 2022-01-28 2023-08-03 Armosen, S.L. Estructura portatil, para ascender y descender de lugares inaccesibles, con plataforma de trabajo autoestable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976345A (en) * 1932-10-03 1934-10-09 Hruby Frank Ladder
FR881547A (fr) * 1941-02-27 1943-04-28 Appareil pour la cueillette des fruits et en particulier des olives
US4085820A (en) * 1977-07-05 1978-04-25 Cerny Louis F Ladder leveler
US4524849A (en) * 1984-06-11 1985-06-25 Terrence Arthur Riddle Tripod

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976345A (en) * 1932-10-03 1934-10-09 Hruby Frank Ladder
FR881547A (fr) * 1941-02-27 1943-04-28 Appareil pour la cueillette des fruits et en particulier des olives
US4085820A (en) * 1977-07-05 1978-04-25 Cerny Louis F Ladder leveler
US4524849A (en) * 1984-06-11 1985-06-25 Terrence Arthur Riddle Tripod

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9534443B1 (en) 2011-12-27 2017-01-03 Robert C. Bogart Ladder and related methods
WO2014132733A1 (ja) * 2013-02-26 2014-09-04 Aoi Tokuo 脚立
JP5956056B2 (ja) * 2013-02-26 2016-07-20 ▲徳▼夫 青井 脚立
US9689204B2 (en) 2013-02-26 2017-06-27 Tokuo AOI Stepladder
USD761442S1 (en) 2014-07-10 2016-07-12 Tokuo AOI Stepladder
USD757959S1 (en) 2015-04-28 2016-05-31 Tokuo AOI Stepladder
USD758615S1 (en) 2015-04-28 2016-06-07 Tokuo AOI Stepladder
USD765269S1 (en) 2015-04-28 2016-08-30 Tokuo AOI Stepladder
CN105317369A (zh) * 2015-10-08 2016-02-10 王广宁 采摘梯
CN105317369B (zh) * 2015-10-08 2017-03-01 王广宁 采摘梯
WO2023144429A1 (es) 2022-01-28 2023-08-03 Armosen, S.L. Estructura portatil, para ascender y descender de lugares inaccesibles, con plataforma de trabajo autoestable

Also Published As

Publication number Publication date
EP1079062A3 (de) 2001-06-13
GB9919991D0 (en) 1999-10-27

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