EP2060735A1 - Échelle trépied à rallonges amovibles - Google Patents

Échelle trépied à rallonges amovibles Download PDF

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Publication number
EP2060735A1
EP2060735A1 EP07121000A EP07121000A EP2060735A1 EP 2060735 A1 EP2060735 A1 EP 2060735A1 EP 07121000 A EP07121000 A EP 07121000A EP 07121000 A EP07121000 A EP 07121000A EP 2060735 A1 EP2060735 A1 EP 2060735A1
Authority
EP
European Patent Office
Prior art keywords
ladder
support legs
support
stepladder
hand rail
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Withdrawn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
EP07121000A
Other languages
German (de)
English (en)
Inventor
Jennhwa Alan Lo
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
Priority to EP07121000A priority Critical patent/EP2060735A1/fr
Publication of EP2060735A1 publication Critical patent/EP2060735A1/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Withdrawn legal-status Critical Current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
    • E06C1/00—Ladders in general
    • E06C1/02—Ladders in general with rigid longitudinal member or members
    • E06C1/14—Ladders capable of standing by themselves
    • E06C1/16—Ladders capable of standing by themselves with hinged struts which rest on the ground
    • E06C1/20—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles
    • E06C1/22—Ladders capable of standing by themselves with hinged struts which rest on the ground with supporting struts formed as poles with extensible, e.g. telescopic, ladder parts or struts
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C7/00—Component parts, supporting parts, or accessories
    • E06C7/18—Devices for preventing persons from falling
    • E06C7/181—Additional gripping devices, e.g. handrails
    • E06C7/182—Additional gripping devices, e.g. handrails situated at the top of the ladder

Definitions

  • the present invention relates generally to ladders and, more specifically, to an extension stepladder with tripod forming support rails.
  • the three legs of the tripod are the two support rails and the ladder which is described as one leg.
  • the tripod style extension stepladder of the present invention provides means for improved safety, increased capability and convenience.
  • the tripod legs maximize the base spans of the stepladder by extending divergently from the ladder portion creating a large base support. The higher the ladder extension the larger the base spans on the floor so that the user does not have to compromise the stability at any elevation setting.
  • Each of the support rails is independently telescopic to allow for use on uneven surfaces.
  • Each of the upper support legs have hollow shoe at the lower end.
  • the hallow shoe allow the retractable lower support leg and function as footing when the extension member is removed.
  • the upper ladder portion can be used independently as a tripod ladder.
  • the ladder portion is comprised of upper ladder portion and lower ladder portion with upper ladder portion terminating at its base in upper ladder footing and at its top end in top cap having rails extending therefrom terminating in hand rail with strap attached thereto.
  • Lower ladder portion has a track in each side rail for receiving the side rails of the upper ladder portion.
  • the height of support legs and ladder portion are adjustable by the lock key includes a locking pin that engages an aperture in the corresponding leg to secure the desired position. Indicia are further provided for aiding in setting up the ladder on a level surface.
  • lower support legs has a plurality of spaced apart apertures whereby one of said apertures is selectively aligned with upper support leg aperture so that lock key can be inserted therein fixing the support legs at a desired height and the upper ladder portion of the present invention can be used independently of its extension members.
  • the support legs comprise a locking member for securing the support legs to the ladder portion making the tripod stepladder easier to handle and transport.
  • individually lower support leg 66 providing means for compensating placement on a surface that is sloped or uneven, and the predetermined angle between the ladder portion 18 and support legs 20 is confined by the spanner 22, thereby preventing movement of the members when the tripod stepladder in the open position and forming a tripod support base having an improved side to side stability that is not currently available.
  • the user is provided with a tripod stepladder having means for setting to a desired height along with the improved stability features that allow the user to extend the lower support leg 66 to a user selected position that places the lower support leg 66 at a width far exceeding the typical width of the ladder portion 18 providing a side to side stability not currently available.
  • the support legs 20 angular inclination is fixed by multiple, rigid spanners 22 forming structurally integral tripod support members, wherein one end of a spanners 22 of the present invention and the means by which they connect to the outer surface of the support leg 20.
  • the spanner 22 is fastened to support leg bracket 86 by means of a fastener 42 whereby the spanner 22 is pivotally connected thereto, and another end of the spanner 22 is fastened to a ladder bracket 82 fixedly attached to the outer surface of the ladder portion 18.
  • the spanner 22 is connected by means of a fastener whereby the spanner 22 is pivotal.
  • Another spanner 22 has similar connection between the other support leg 20 and the opposing ladder side rail.
  • the third spanner 22 is pivotally connected between the two support legs 20.
  • means is provided for creating an integrally rigid tripod support frame for maintaining the angular divergence of the support legs 20 and an enhanced side to side stability.
  • a safety belt 36 is attached to the extendable hand rail 34 which is located at the top to the ladder system. Also shown are rungs 24, adjustment lock keys 28, top cap 32 with pivot 48 for connecting support leg 20, and lower support leg 66 and support leg 20.
  • the additional form of the present invention comprises an upper ladder portion and a lower extendable portion.
  • the rung 24 ladder portion 18 is comprised of upper ladder portion 52 and lower ladder portion 56 with upper ladder portion 52 terminating at its base in upper ladder footing 54 and at its top end in top cap 32 having rails 72 extending therefrom terminating in hand rail 34 with safety belt 36 attached thereto.
  • Lower ladder portion 56 has at its base lower ladder portion footing 58 and has a track in each side rail for receiving the side rails of the upper ladder portion 52.
  • Support legs 20 are pivotally attached to pivot 48 of top cap 32 and are comprised of upper support legs 60 terminating in hollow support leg shoes 64 and lower support legs 66 terminating with lower support leg footing 70.
  • Lower support legs 66 are sized to be slidably inserted into their respective upper support leg 60 via hollow support leg shoes 64.
  • lower support legs 66 has a plurality of spaced apart apertures 68 whereby one of said apertures 68 is selectively aligned with upper support leg aperture 62 so that lock key 28 can be inserted therein fixing the support legs 20 at a desired height and the upper ladder portion 52 of the present invention can be used independently of its extension members.
  • FIG. 6 shown is a cross sectional view taken from Figure 5 as indicated of the hollow support leg shoe 64.
  • the hollow support leg shoe 64 has chamber 74 and socket 76 for receiving upper support leg 60.
  • channel 78 for receiving the lower support legs 66 when used.
  • the hollow support leg shoe 64 has base 80 serving as support leg footing when the upper stepladder member is used without its extension members.
  • corresponding indicia 100 is placed on ladder 18 and lower support legs 66 to aid in positioning the ladder on a level surface when using the extension members.
  • the present invention overcomes the shortcomings of the prior art by providing means for telescopic adjustment of both support rails that form a tripod formation that in turn allows a user to adjust the ladder height, stabilize and level the stepladder for use on both an even and uneven surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
EP07121000A 2007-11-19 2007-11-19 Échelle trépied à rallonges amovibles Withdrawn EP2060735A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07121000A EP2060735A1 (fr) 2007-11-19 2007-11-19 Échelle trépied à rallonges amovibles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07121000A EP2060735A1 (fr) 2007-11-19 2007-11-19 Échelle trépied à rallonges amovibles

Publications (1)

Publication Number Publication Date
EP2060735A1 true EP2060735A1 (fr) 2009-05-20

Family

ID=39362276

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121000A Withdrawn EP2060735A1 (fr) 2007-11-19 2007-11-19 Échelle trépied à rallonges amovibles

Country Status (1)

Country Link
EP (1) EP2060735A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103821450A (zh) * 2014-02-12 2014-05-28 张广舜 一种新型多用梯子
US9534443B1 (en) 2011-12-27 2017-01-03 Robert C. Bogart Ladder and related methods
CN108868572A (zh) * 2018-07-02 2018-11-23 郭铁建 一种新式的农业用可调高多功能梯子

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE25746C (de) * 1883-07-20 1884-11-08 C. G. SCHELLER in Leipzig Verstellbare Leiter zum Fensterputzen
CH290834A (fr) * 1949-07-07 1953-05-31 Reitzer Charles Echelle.
FR2068180A5 (fr) * 1969-11-24 1971-08-20 Stalon Rene
GB2130289A (en) * 1982-11-18 1984-05-31 Quick Set Inc Latch mechanism for tripod and spreader legs
US4949809A (en) * 1989-12-07 1990-08-21 A. C. Innovations, Inc. Extendable pole locking mechanism for ladder stabilizer
FR2832755A1 (fr) * 2001-11-26 2003-05-30 Sevylor Internat Echelle de securite, notamment pour piscine, en particulier pour piscine hors-sol
US20050045423A1 (en) * 2003-08-27 2005-03-03 Meeker Paul K. Foldable step ladder with leg aligner and handle
US7255198B1 (en) * 2004-10-25 2007-08-14 Jennhwa Alan Lo Tripod extension stepladder

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE25746C (de) * 1883-07-20 1884-11-08 C. G. SCHELLER in Leipzig Verstellbare Leiter zum Fensterputzen
CH290834A (fr) * 1949-07-07 1953-05-31 Reitzer Charles Echelle.
FR2068180A5 (fr) * 1969-11-24 1971-08-20 Stalon Rene
GB2130289A (en) * 1982-11-18 1984-05-31 Quick Set Inc Latch mechanism for tripod and spreader legs
US4949809A (en) * 1989-12-07 1990-08-21 A. C. Innovations, Inc. Extendable pole locking mechanism for ladder stabilizer
FR2832755A1 (fr) * 2001-11-26 2003-05-30 Sevylor Internat Echelle de securite, notamment pour piscine, en particulier pour piscine hors-sol
US20050045423A1 (en) * 2003-08-27 2005-03-03 Meeker Paul K. Foldable step ladder with leg aligner and handle
US7255198B1 (en) * 2004-10-25 2007-08-14 Jennhwa Alan Lo Tripod extension stepladder

Cited By (4)

* 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
CN103821450A (zh) * 2014-02-12 2014-05-28 张广舜 一种新型多用梯子
CN108868572A (zh) * 2018-07-02 2018-11-23 郭铁建 一种新式的农业用可调高多功能梯子
CN108868572B (zh) * 2018-07-02 2019-12-06 浙江兴岛机械股份有限公司 一种新式的农业用可调高多功能梯子

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