EP0172284A1 - Dispositif stabilisateur d'échelle - Google Patents

Dispositif stabilisateur d'échelle Download PDF

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Publication number
EP0172284A1
EP0172284A1 EP84305669A EP84305669A EP0172284A1 EP 0172284 A1 EP0172284 A1 EP 0172284A1 EP 84305669 A EP84305669 A EP 84305669A EP 84305669 A EP84305669 A EP 84305669A EP 0172284 A1 EP0172284 A1 EP 0172284A1
Authority
EP
European Patent Office
Prior art keywords
ladder
elongate member
stabilising
elongate
foot
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Withdrawn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
EP84305669A
Other languages
German (de)
English (en)
Inventor
Robert Ralston
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.)
R.P.R. DESIGNS INC.
Original Assignee
Rpr Designs Inc
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
Priority to CA000415580A priority Critical patent/CA1174211A/fr
Application filed by Rpr Designs Inc filed Critical Rpr Designs Inc
Priority to EP84305669A priority patent/EP0172284A1/fr
Publication of EP0172284A1 publication Critical patent/EP0172284A1/fr
Withdrawn legal-status Critical Current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
    • E06C7/42—Ladder feet; Supports therefor
    • E06C7/423—Ladder stabilising struts

Definitions

  • the present invention relates to a ladder stabilising device for extension ladders having hollow rungs. More particularly, the invention relates to an adjustable ladder stabilising device which can be secured to one or to both sides of the ladder without interrupting the structural integrity of the ladder.
  • An object of the present invention is to obviate or to mitigate the above said disadvantages.
  • the invention solves the problem of providing a ladder stabiliser suitable for widespread use without destroying the structural integrity of the ladder by connecting a stabilising device to the ladder through the hollow rungs of the ladder.
  • the stabilising device is rapidly movable on the ladder between an in-use and an out-of-use position where the stabiliser lies along the side of the ladder and which allows the ladder to be stored easily and used with minimal time and effort.
  • stabilising apparatus for use with a ladder having hollow rungs, the apparatus having at least one stabilising device locatable at one side of the ladder, the stabilising device having at least one first connecting means for extending through a rung of the ladder and being securable at the other side of the ladder, the stabilising device having base means for supporting the stabilising device on a surface, whereby in use, the stabilising device has on a surface adjacent the ladder and effectively increases the base width of the ladder.
  • the ladder does not have its structural integrity destroyed by mounting the stabiliser
  • the hollow rungs serve as guides for members of the stabilising devices which pass through the rungs and act as reaction portions for securing the stabiliser to the ladder. Because damage to the ladder is avoided, the manufacturers warranty is not invalidated which is attractive to those dealing with insurance claims and workers compensation claims
  • the stabiliser folds up on the ladder to an out-of-use position it always remains on the ladder so it is readily usable and can be stored like a normal ladder with the stabiliser in the out-of-use postion.
  • the stabiliser is also height adjustable so that the feet of the ladder can be moved to accommodate the height of the ladder on uneven ground. Also because the height adjusting means are located at the upper end of the stabiliser the height can ber easily and rapidly adjusted by the user without stooping as is required with prior proposals.
  • a spring loaded pin is used to retain the stabiliser in a particular height position.
  • This pin rapidly and easily secures the stabiliser legs to the ladder frame and is also used to retain the stabiliser parallel to the side of the ladder in an out-of-use position so that the stabiliser lies against the side of the ladder to facilitate transport and storage.
  • the stabiliser has feet which are adaptd to lie substantially flat when the stabiliser is used when the ladder is in an inclined position, to further improve stability and to prevent the ladder moving away from the surface it is leaning against.
  • the ladder stabiliser is made using inexpensive, easily manufactured parts which pivot relative to each other in such a way that the stabiliser can lie flat against the ladder side for storage.
  • stabilisers can be attached to each other through the rungs of the ladder, or a single stabiliser can be mounted to one side of the ladder using parts secured through the ladder rungs. Also stabilisers on opposite sides of the ladder can be used independently and this is particularly suitable if the ladder is near a wall or fence. Some prior propsals do not readily demonstrate this flexibility of use.
  • stabilising apparatus for use with a ladder having hollow rungs, the stabilising apparatus having at least two stabilising devices, at least one stabilising device being located on each side of the ladder, each stabilising device having upper and lower bracket means connected together by linked upper and lower longitudinal members, the respective upper and lower members of the stabilising devices being connected together by respective rods which extend through the rungs of the ladder, whereby, in use, the lower longitudinal members lie adjacent a surface and increase the effective base width of the ladder.
  • each stabilising device is adjustable by varying the point of securement between the upper bracket means and the upper longitudinal members to alter the attitude of lower longitudinal member for support on the surface adjacent its side of the ladder.
  • an aluminum extension ladder generally indicated by reference numeral 20, has a lower section 22 with sides 24,26 interconnected by hollow rungs 28.
  • identical stabilising element 30, generally indicated by reference numeral 30, are connected to each other by threaded rods 32, which pass through the rungs of the ladder and each stabilising element 30 is independently adjustable.
  • a stabilising element 30 consists of an upper elongate U-shaped bracket 34 which has spaced apertures 36 in its base to register with rung-holes 38 to receive threaded bars 32 which pass through the ladder rungs. Nuts 40 are used to secure the bracket on the rods so that it lies against the side 24 of the ladder.
  • the bracket has a plurality of aligned spaced apertures 37 in each leg of the U to locate the upper end of the stabilising leg and for adjusting the height of the stabiliser support as will be described.
  • a lower U-shaped stabilising bracket 42 also has an aperture 44 for registering with a rung-hole 38 for receiving a threaded rod 32, so that the bracket can be secured against the ladder side by nut 46.
  • the bracket has aligned apertures 47 in the legs to receive a pin 48 for locating a stabilising strut for pivotal movement about the pin axis as will be described.
  • a steel stabilising leg 50 has a generally U-shaped cross section and its upper end 52 has aligned apertures 53 for registering with a respective pair of apertures 37 and is secured thereat by a spring loaded pin 54.
  • the lower end 55 of the leg 50 has a swivel foot 56, pivotally mounted thereto by a bolts 60, for contacting the ground for support.
  • the leg 50 has an aperture 62 intermediate its ends for permitting the stabiliser to be secured to the bracket 34 when the stabiliser is in a folded position.
  • the stabiliser leg 50 is connected to bracket 42 by a pair of U-shaped struts 64 for bracing the leg against the side of the ladder.
  • the struts are mounted at the leg end 65 by a pin 68 and nut 70 which permits relative pivotal movement between the struts 64 and the leg 50.
  • the struts are also pivotally mounted at the ladder end 67 by the pin 48 and a nut 49 as shown in the assembled stabiliser section on the other side of the ladder.
  • the pivotable connections at the ends of the struts allow each stabilizer section to be folded between an in-use position as shown and an out-of-use and storage position as shown in Fig. 3, the operation of which will be later described.
  • Fig. 2 shows a front view of a ladder with a stabilising element 30 folded up into a storage position at the side and the other stabilising element 30 shown in two possible different positions so that the foot of the stabiliser is supported on an uneven surface.
  • the leg and strut follows the path during folding as indicated by the arrows.
  • the swivel foot 56 of the leg 50 lies on the side 24 of the ladder above the bracket 42 and the leg is secured to the bracket by the pin 54 which passes through two sets of aligned apertures as best seen in Fig. 3.
  • the leg and stabilising element 30 does not substantially increase the width of the ladder or its thickness and storage of the ladder is not affected.
  • Fig. 2 also illustrates that each stabilising element 30 can be rapidly adjusted to accommodate uneven ground.
  • the end 52 of the leg 50 is secured by pin 54 to the lowermost apertures 37 in bracket 34 to locate the foot 56 beneath the feet of the ladder.
  • the stabiliser section can be easily and rapidly moved to another position, shown by a broken line, for example when the ground at the side of the ladder is higher than the ground under the feet of the ladder. In this position the upper end 52 is shown secured to the top end of the bracket.
  • Fig. 3 shows a sectional view along the line 2-2 in Fig. 1 , when the stabilising elements 30 are assembled. It will be seen that threaded rod 32 passes through the hollow rung 28 of the ladder and through respective apertures 36 in bracket 34 and the bracket 34 is secured to the side of the ladder by nuts 40.
  • the base 35 of the U-bracket 34 has a member projecting section 39 in which the apertures 36 are located and which securely fits in the rung hole 38 to assist in locating and securely mounting the bracket.
  • leg 50 On the right hand side of Fig. 3 it will be seen that the generally U-shaped channel section of leg 50 is received with U-shaped bracket 34 and that pin 54 passes through aligned apertures 37 and 62. Struts 64 are also shown. The pin 54 is held in place by spring 57 which must be displaced inwardly by force, e.g. by pulling or pushing to pass the pin 54 through an aperture.
  • leg 50 On the left hand side of Fig. 3 the leg 50 is shown extending outwardly and downwardly as in Fig. 2.
  • Fig. 4 is a sectional view taken along the line 4-4 in Fig. 2 and illustrates the mounting of the foot 56 to the leg.
  • the foot 56 overlies the leg and is secured thereto by bolts 60 which pass through each side of the leg to be secured by nuts 61.
  • the outwardly extending threaded ends of the bolts and nuts are accommodated in the distance between the struts 64 by using spacing washers 63 to space the struts from the leg 50 and bracket 42 as described above.
  • the shape of the foot 56 is best seen in Fig. 5.
  • the foot has a flat base 72 and sides 74, 76 inclined at an angle of 17° to the base so that when the ladder is resting at an incline of 17° the base 72 of the foot rests flat on the ground to give maximal surface contact and to further prevent the risk of the ladder sliding away from the wall.
  • stabiliser device is described for use with aluminum extension ladders it will be appreciated that it could be used with a non-extension ladder with hollow rungs.
  • the stabiliser components are made of steel but it will be appreciated that aluminum or any other suitable material could be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP84305669A 1982-11-15 1984-08-20 Dispositif stabilisateur d'échelle Withdrawn EP0172284A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA000415580A CA1174211A (fr) 1982-11-15 1982-11-15 Accessoire stabilisateur pour echelle
EP84305669A EP0172284A1 (fr) 1982-11-15 1984-08-20 Dispositif stabilisateur d'échelle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000415580A CA1174211A (fr) 1982-11-15 1982-11-15 Accessoire stabilisateur pour echelle
EP84305669A EP0172284A1 (fr) 1982-11-15 1984-08-20 Dispositif stabilisateur d'échelle

Publications (1)

Publication Number Publication Date
EP0172284A1 true EP0172284A1 (fr) 1986-02-26

Family

ID=25669862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305669A Withdrawn EP0172284A1 (fr) 1982-11-15 1984-08-20 Dispositif stabilisateur d'échelle

Country Status (2)

Country Link
EP (1) EP0172284A1 (fr)
CA (1) CA1174211A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113469A1 (de) * 1991-04-25 1992-10-29 Loh Kg Hailo Werk Leiter
US7017711B1 (en) * 2002-10-23 2006-03-28 Shaikh Mehboob Ali Method for extending the leg of a ladder and apparatus therefor
WO2012160372A1 (fr) 2011-05-23 2012-11-29 Steve Evans Dispositif pour mettre de niveau et stabiliser une échelle
US9187954B1 (en) 2009-01-26 2015-11-17 Andrew S. Parsons Angle configuring stabilizing assembly for extension ladders
CN106593286A (zh) * 2017-01-23 2017-04-26 黄崇华 折叠梯
CN111446658A (zh) * 2020-03-31 2020-07-24 湖南华润电力鲤鱼江有限公司 鱼竿式高空作业检修平台
US20210180404A1 (en) * 2019-12-12 2021-06-17 Albert Larry Gerbrandt Ladder stabilizer apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9507740D0 (en) * 1995-04-13 1995-05-31 Hunter Terence W Ladder brace
CN106121503B (zh) * 2016-06-23 2018-02-06 朱靖晖 一种防倾倒人字梯
CN111794670B (zh) * 2020-06-16 2022-04-15 兰新伟 一种电力检修用具有折叠结构的爬杆装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933221A (en) * 1971-12-17 1976-01-20 Sorenson Virgil H Ladder adjusting and stabilizing apparatus
NL7707754A (en) * 1977-07-12 1979-01-16 Burg & Muls B V Ladder with support feet - has feet hinging between extended and folded positions and lockable in both
GB2053334A (en) * 1979-07-18 1981-02-04 Sacome Int Sa Ladder struts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3933221A (en) * 1971-12-17 1976-01-20 Sorenson Virgil H Ladder adjusting and stabilizing apparatus
NL7707754A (en) * 1977-07-12 1979-01-16 Burg & Muls B V Ladder with support feet - has feet hinging between extended and folded positions and lockable in both
GB2053334A (en) * 1979-07-18 1981-02-04 Sacome Int Sa Ladder struts

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4113469A1 (de) * 1991-04-25 1992-10-29 Loh Kg Hailo Werk Leiter
US7017711B1 (en) * 2002-10-23 2006-03-28 Shaikh Mehboob Ali Method for extending the leg of a ladder and apparatus therefor
US9187954B1 (en) 2009-01-26 2015-11-17 Andrew S. Parsons Angle configuring stabilizing assembly for extension ladders
WO2012160372A1 (fr) 2011-05-23 2012-11-29 Steve Evans Dispositif pour mettre de niveau et stabiliser une échelle
CN106593286A (zh) * 2017-01-23 2017-04-26 黄崇华 折叠梯
US20210180404A1 (en) * 2019-12-12 2021-06-17 Albert Larry Gerbrandt Ladder stabilizer apparatus
US12065880B2 (en) * 2019-12-12 2024-08-20 Albert Larry Gerbrandt Ladder stabilizer apparatus
CN111446658A (zh) * 2020-03-31 2020-07-24 湖南华润电力鲤鱼江有限公司 鱼竿式高空作业检修平台

Also Published As

Publication number Publication date
CA1174211A (fr) 1984-09-11

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: R.P.R. DESIGNS INC.

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RALSTON, ROBERT

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19861027

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RALSTON, ROBERT