US3722622A - Folding and collapsible ladders - Google Patents

Folding and collapsible ladders Download PDF

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US3722622A
US3722622A US3722622DA US3722622A US 3722622 A US3722622 A US 3722622A US 3722622D A US3722622D A US 3722622DA US 3722622 A US3722622 A US 3722622A
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ladder
rungs
side rails
side walls
section
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E Lauring
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E Lauring
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    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06CLADDERS
    • E06C1/00Ladders in general
    • E06C1/02Ladders in general with rigid longitudinal member or members
    • E06C1/38Special constructions of ladders, e.g. ladders with more or less than two longitudinal members, ladders with movable rungs or other treads, longitudinally-foldable ladders
    • E06C1/383Foldable ladders in which the longitudinal members are brought together on folding

Abstract

A folding and collapsible ladder wherein the rungs are pivotally attached to the side rails and adjacent rungs are attached to the side rails in different planes, i.e., adjacent rungs are offset. To collapse or fold the ladder into a narrow but slightly longer mass, the rungs fold down like a closing parallelogram until the rungs are substantially parallel to the side rails. Rigidity of the ladder is provided by one or more braces pivotally attached at one end to one side rails and the opposed end of the braces provided with fastening means to removable secure the braces to the other side rail.

Description

United States Patent Lauring Mar. 27, 1973 {54] FOLDING AND COLLAPSIBLE 258,186 5/1882 Winters ..182/159 LADDERS 2,875,935 3/1959 Bultermore ..182/160 [76] lnvemor' x i ggga tai i g- 2 251 Primary ExaminerReinald0 P. Machado Fans, Minn 56649 1 AttorneyH. F. Woodward [22] Filed: Mar. 18, 1971 57 TR I 1 pp 1251689 A folding and collapsible ladder wherein the rungs are pivotally attached to the side rails and adjacent rungs 521 11.5. c1 ..182/159, 182/178 are attached to the Side rails in different Planes, [51] 0 adjacent rungs are offset. To collapse or fold the {58] Field of Search ..182/160, l59,95,96 ladder imo a narrow but Slightly longer mass, the rungs fold down like a closing parallelogram until the [56] References Cited rungs are substantially, parallel to the side rails. Rigidity of the ladder is provided by one or more braces UNITED STATES PATENTS pivotally attached at one end to one side rails and the 453,929 6/1891 Heister 182 160 pp end Of the braces Provided with fastening 3,517,770 6/1970 Loix ..l82/96 means to removable secure the braces to the other 1,887,301 11/1932 Gordon ..182/159 Side rail.

355,574 1/1887 Tilley 1 ..182/178 2,962,] 13 11/1960 Heimlicher 182/160 3 Claims, 10 Drawing Figures FOLDING AND COLLAPSIBLE LADDERS This invention relates to a folding ladder of the type of having a pair of side rails, collapsibly secured together and in which the side rails pivotally supports a series of spaced-apart rungs adapted to be secured in an operative position.

It is an object of the present invention to make a collapsible ladder construction in which the adjacent rungs are in different planes, i.e., offset from each other, and means being provided for locking or bracing the rungs in a parallel spaced-apart position, and which can be easily disengaged when desirable to fold or co]- lapse the ladder by closing the rails upon one another.

These and other objects and novel features will be more fully appreciated from the following description of preferred embodiments of the invention selected for purposes of illustrations and shown in the accompanying drawings in which:

FIG. 1 is a front elevational view of the novel folding or collapsible ladder:

FIG. 2 is a fragmentary view of the ladder fully col- 7 lapsed condition:

FIG. 3 is an end view showing brackets for pivotally attaching ladder rungs to the side rails:

FIG. 4 is a view of the ladder, with parts broken away, showing use of opposed channel bars for the side rails:

FIG. 5 is a view similar to FIG. 4 in which the side rails are channel bars with middle web or two channel bars secured together for side rails:

FIG. 6 is a view of the folding ladder, with parts broken away, showing solid material as side rails:

FIG. 7 is an end view of solid side rails showing two rows of rungs in different plan or offset each other:

FIG. 8 is a side view of an extension to be used with the folding ladder:

FIG. 9 is a front view, with parts broken away, showing folding ladder with folding extension: and

FIG. 10 is a side view showing the folding extension used with folding ladder to provide a self supporting ladder.

In the structures shown in the drawings numerals l0 and 12 denote side rails of wood, magnesium, aluminum, or any suitable material. The side rails 10 and 12 may be of any desired dimensions, and may be solid material as shown in FIGS. 1, 2, 6 and 7, or may be in the form of channel bars as generally indicated at 26 and shown in FIG. 4, or modified channel bars as indicated at 28 and shown in FIG. 5. Braces 14 are provided between side rails as shown in FIGS. 1 and 9. It being understood that any suitable bracing means may be used, for example, brace shown in FIG. 80f U.S. Pat. No. 2,727,671 and as shown in FIG. 1 of U.S. Pat. No. 1,341,707.

The novel arrangement of parts which provide a way to fold or collapse a ladder so that it occupies a minimum of space. The folding is accomplished by offsetting or positioning in different planes, every other rung 16 so that they fold by each other. The rungs 16 are in a plurality of rows and are pivotally at 18 and 20 where they are attached to the ladder side rails 10 and 12. The-rungs can fold down like a closing parallelogram until the rungs become substantially parallel to the side rails.

The folded length of the ladder becomes longer by approximately the length of a rung. The thickness of the folded ladder may be as low as the thickness of the side rails.

Rigidity of the ladder is provided by suitable brace or braces 14. In FIGS. 6 and 9 diagonally cross members form the bracing effect. One end of braces 14 is hinged at 19 and 21 where they are attached to the side rails 10 and 12', and the other ends of the braces 14 are provided with suitable fastening devices 22 and 24 for remobile attaching them to side rails 10 and 12. The fastening devices in a simple form may be a self-locking snap-in pin in a hole in the side rails. When the ladder is in the folded position the diagonal braces 14 are folded down along the edge of the side rail to which it is attached. It is to be understood that a locking mechanism may be placed on the end or ends of each rung for providing rigidity to the folding ladder. The rungs may be made of wood, metal, composition, solid or hollow and in suitable geometric shape to provide strength.

The ladder may be of any practicable length and extra sections may be attached to give the desired length. The ladder sections may vary in width whereby the equivalent ofa tapered ladder is provided.

In FIG. 3 are shown one means of pivotally attaching rungs 16 to the side rails 10 and 12. This means includes generally U-shaped cross-section and having their bottoms sections 26 solidly secured to the side rails 10 and 12. If desired U-shaped means may be constructed as an integral part of the side rails of the types shown in FIGS. 4 and 5. The rungs 16 have their end portions journaled on the shafts 28. Spacers 30 between the rungs l6 and the flanges 32.

As shown in FIGS. 4 and 5 the channel-like members have bottoms, side walls extending outwardly from the bottoms and rib-like members extending longitudinal of each channel and parallel to the side walls. The rib does not extend outwardly a distance greater than the side walls/The ribs may be interrupted between areas of rung attachments (See FIG. 4).

If additional section are to be employed to make a longer ladder, one of the extensions as shown in FIG. 8 is made as shown and is narrower than the first section. Aperatures or openings 33 and 34 are provided in one end of the extensions side rails. If desirable locking devices or pins 36 may be used to secure the sections of the ladder together. In use the extension, in the most extended position, the bottom part thereof should have the top rung of the ladder fit into the openings 33 and tially equal to distance between adjacent rungs in the first section of the ladder.

In FIG. 10 is shown the novel ladder and an extension used as a self supporting IadderJWhen the ladder. is used in this manner a removable braces 38 are used and a modified rung receiving means 40 is provided. In

this use and some other uses the extension section only may 'not have the rungs off-set, but in casses the rung spacing must be greaterthan the length of the rungs to nel-like members side rails; each of said rails having bottom, outwardly extending side walls and longitudinal extending rib-like member projecting from the bottom and being substantially parallel to side walls; one section of said ladder having one end of each channel-like side rails provided with one wall, part of bot tom and rib, extending the distance between-adjacent rungsin the other section, beyond the remainder of bottom and other sidewall, the bottoms of unequal length having rung receiving openings therein; rungs pivotally attached to side walls and ribs, adjacent rungs at-least in one section attached to side walls and ribs in different planes whereby on collapsing the rungs fold down between side walls and ribs and means for maintaining ladder in uncollapsed position.

2. A collapsible ladder according to claim 1, in which said channel-like members arebraced in opened position by brace pivotally attached at one end to said channels and opposed end of said brace detachable secured to another channels.

3. A collapsible ladderin accordance with claim 1, in which said means for maintaining ladder in uncollapsed position are cross members. i

Claims (3)

1. A folding and collapsible ladder comprising two sections; each section having oppositely facing channel-like members side rails; each of said rails having bottom, outwardly extending side walls and longitudinal extending rib-like member projecting from the bottom and being substantially parallel to side walls; one section of said ladder having one end of each channel-like side rails provided with one wall, part of bottom and rib, extending the distance between adjacent rungs in the other section, beyond the remainder of bottom and other sidewall, the bottoms of unequal length having rung receiving openings therein; rungs pivotally attached to side walls and ribs, adjacent rungs at least in one section attached to side walls and ribs in different planes whereby on collapsing the rungs fold down between side walls and ribs and means for maintaining ladder in uncollapsed position.
2. A collapsible ladder according to claim 1, in which said channel-like members are braced in opened position by brace pivotally attached at one end to said channels and opposed end of said brace detachable secured to another channels.
3. A collapsible ladder in accordance with claim 1, in which said means for maintaining ladder in uncollapsed position are cross members.
US3722622D 1971-03-18 1971-03-18 Folding and collapsible ladders Expired - Lifetime US3722622A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042991A (en) * 1976-06-21 1977-08-23 Suntech, Inc. Parallelogram structure
US4482029A (en) * 1983-06-23 1984-11-13 Prochaska William J Truck ladder
EP0136904A2 (en) * 1983-09-30 1985-04-10 Reitzer, Joseph Collapsible ladder
US4998982A (en) * 1988-12-16 1991-03-12 Arnold William F Metal ladder construction with reinforced side rails
US6145621A (en) * 1997-09-02 2000-11-14 Nye; John E. Boarding ladder for a boat bow
US6536558B2 (en) 2001-02-16 2003-03-25 Harold E. Price Folding ladder
US20060213721A1 (en) * 2005-03-25 2006-09-28 Mario Uttaro Multiple laddering system - the ultimate foldaway system
US8191685B1 (en) * 2011-05-16 2012-06-05 Geiselman Iii Grover J Folding ladder
US20130048429A1 (en) * 2011-08-31 2013-02-28 Ardisam, Inc. Self-locking bi-foldable load bearing segment
US9068394B1 (en) 2014-10-10 2015-06-30 Grover J. Geiselman, III Space saving ladder
US20160090741A1 (en) * 2013-05-23 2016-03-31 Les Enceintes Acoustiques Unisson Inc. Foldable structural truss
CN105971489A (en) * 2016-05-26 2016-09-28 沈炜 Power operation ladder
CN110656878A (en) * 2019-09-29 2020-01-07 国网青海省电力公司海西供电公司 Foldable fixed ladder

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042991A (en) * 1976-06-21 1977-08-23 Suntech, Inc. Parallelogram structure
US4482029A (en) * 1983-06-23 1984-11-13 Prochaska William J Truck ladder
EP0136904A2 (en) * 1983-09-30 1985-04-10 Reitzer, Joseph Collapsible ladder
EP0136904A3 (en) * 1983-09-30 1986-12-30 Reitzer, Joseph Collapsible ladder
US4998982A (en) * 1988-12-16 1991-03-12 Arnold William F Metal ladder construction with reinforced side rails
US6145621A (en) * 1997-09-02 2000-11-14 Nye; John E. Boarding ladder for a boat bow
US6536558B2 (en) 2001-02-16 2003-03-25 Harold E. Price Folding ladder
US20060213721A1 (en) * 2005-03-25 2006-09-28 Mario Uttaro Multiple laddering system - the ultimate foldaway system
US8191685B1 (en) * 2011-05-16 2012-06-05 Geiselman Iii Grover J Folding ladder
US20130048429A1 (en) * 2011-08-31 2013-02-28 Ardisam, Inc. Self-locking bi-foldable load bearing segment
US9027711B2 (en) * 2011-08-31 2015-05-12 Ardisam, Inc. Self-locking bi-foldable load bearing segment
US20160090741A1 (en) * 2013-05-23 2016-03-31 Les Enceintes Acoustiques Unisson Inc. Foldable structural truss
US9909314B2 (en) * 2013-05-23 2018-03-06 Les Enceintes Acoustiques Unisson Inc. Foldable structural truss
US9068394B1 (en) 2014-10-10 2015-06-30 Grover J. Geiselman, III Space saving ladder
CN105971489A (en) * 2016-05-26 2016-09-28 沈炜 Power operation ladder
CN110656878A (en) * 2019-09-29 2020-01-07 国网青海省电力公司海西供电公司 Foldable fixed ladder

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