US2040977A - Aluminum ladder - Google Patents

Description

May 19, 1936. s. H. cAR Bls ALUMINUM LADDER Filed Dec. 4, 1955 2 Sheets-Sheet 2 Q 0 U d am 0 P.......d M a we UN TE S T ALUD IINUM LADDER Samuel H. Carbis, Tarentum, Pa., ,ass'ignor to' Aluminum Ladder Company, Tarentum, Pa.

: Application December 4, 1935, Serial'No. 52,92 1 8Claims. (cLzza-is) The device iorming the subject matter of this application is 'an' extension ladder, preferably :made of metal, such as aluminum-and the in- .ventionaims to improve the'constructionoi the foot SeCtlOlTfllid. the head section, to provide novel means for assembling the foot section and the head section for relative longitudinal sliding movement, and, generally, to improve and to enhance the utility of devices of that type to which the invention appertains. J Y

With the above and other objects in ,view,

which will appear as the description proceeds, the

invention resides in' the combination and arrangement or parts and in the details of construction hereinafter described and claimed, it being understood that changes in the 'precise embodiment of. the invention he'rein disclosed,

' may be made within the scope of what is claimed,

without departing Irom' the spirit of the invention. r

In the accompanying drawings: Fig. 1 shows in --plan, Kan extension wherein the invention is embodledy- Fig. 2" is a side elevation'ot'the ladder; Fig. 3 is asection taken' pr 'oxi line-3-3 of ig.2;

.Fig." ,4" is a transverse ladder Fig. 5 is a transverse-se fication; v 'j :J' F g.61s a'section'j th .1111 oil-1 5;

Fig. 7 is'a transverse section'showing another modification v Fig; 8 is a: section on the line 8-4 of Fig. '7. The device forming the subject matter of this application is an all metal extension ladder, preierably made oi aluminum. It; comprises a foot sectionl anda head section 2 mounted for longitudinal slidingadjustment on the foot section I I. The foot section'willbe described ,flrst, then\ the head sectionfand then the relation between the foot section and the head section will be made manifest.

The foot section I comprises side members. Each side member includes oppositely disposed, transversely spaced rails 3, which are' bulb type T-bars, each including a body and a flange, the

flanges projecting toward each other, as shown in 'Figs..1 and 4. Inner and outer gusset plates 4 are mounted on the opposite sides of the flanges of the rails 3, and are connected thereto by securing elements, such as rivets 5.

Brackets 6, in the form of angle members (Fig. 4) are secured by certain 01 the rivets 5 to the inner surfaces of the inner gusset plates 4, near rivets Fare headed.

climber on the rungs.

' of the bosses III of the gusset plates. 4.

to one of the rails 3/ Channel-shaped guides I V abut against the inwardly projecting flanges of the angle brackets 6 and abut againstfth e inner suriaces oi the gusset plates 4. The guides l' 'are' 'secured'to theinner'and outer gusset plates 4 by securing-elements, such as rivets 8, passing through spacers 9, disposed between the gusset plates, the purpose of the spacers being topre- PAT-cur OFFICE 'vent the gusset plates from cavingin whenjthe I The gusset plates '4 have oppositely bulged bosses It, provided with openings" II, in which 1 the end portions'of tubular rungs I 2 are mounted. The rungs I2 are provided with longitudinal ribs I.4 which enhance the hold oi' the foot of 'the Expanding rings I 5 are. 1 forced under pressure into the ends or 'ther'ungs "I2, and expand the rungs sufficiently so that they,

are 'held tightly andjsecurely in the openings ;I I

The head section 215 construct-ed so nearlyi lik e thei'o'ot section I, that it need not be described in detail. The head section 2 does not havethe guides I and the angle brackets 6, and is not 25 so wide as the foot section I. With the foregoing diil'erentiatlng characteristics duly noted,

the head section 2 may be dismissed with the designation oi! the rungs of the head section by the numeral ll. 7

As to the manner of assembling the head section 2 with the foot section I, for relative slidtion 2 are received slidably in the channel-shaped guides I of the foot section I.

of being made as a practical article oi. manufacture, and convenient in the use. 7

-ing' movement, Figs. 4 and 2 will show that the I projecting ends of'the rungs I6 of the head sec- In Figs. 5 and 6, parts hereinbefore described have been designated by numerals previously used, with the suflix a. 1

As to the foot section la, the expanding rings II'oi' Fig. 4 are omitted, the rungs I2a being secured to the bosses I an and to channel rings I'I, disposed between the bosses I00 and including annular flanges I8.

. Securing elements I! are mounted in the. bosses Illa andextend through the flanges Itjof the channelrings II Tubular spacers 20 surround the securingele "ments I9 and are interposed between I. o! the channelrings I1.

the flanges vAs to the head section ia, it is constructedv like the head section 2 of Fig. '4, saving forthe i'act that the expanding ring I5 ot'Fig. 4 is omitted, the construction shown at II, It, IS and 35' The device is simple in construction, capable I unnamed we the root sectionbeinl employed in connection with the-heed section in;

V .2; An'extension lndder compi'isinge' hesd sec V tionand aifo ot section esch comprising rails, innr endcuter gusset pistes, end for securing the gusset. pistes to opposite sidesoi' claimed is:

":1. An extensioneladdercomprisinge hendisec tion; and foot section,-each comprising tails in the form of T-b'ers', each I-bar embodying a transverse jand an inwardly I projecting? In Figs. 7 and}; parts hereinbeiore described have been designated by'numers'ls previously lised,'wlth the sum! b ".e Thez'ussetpitfall) are flat, anddo not hove the ll their place being by tubuhr ll flanges 22 secured to the inner pistes" by attaching elements ll." Theendsofthe runes lib are secured in the sleeves and sbut njgnin'st the inner g'us'setfpls'tes lb. iecttcn zb :is constructed" like toot in, stated, and need not be" described in detail,

parts 21, 22 nnd ll described'in connecfloniwlth the foot section lb being used in the bead v I m; h t mdwherein the-runner tion. 7 7

Having thus described flange; and inner end 'cuteri gusset plates secured to, opposite si'desot the flanges; ehennei-shspe'dguides; means Ifor esecuringf the guides uponthe' inner gusset plates oi the foot section, 'flrst r gs; extendedthrough'thegusset plates oikthe head section and having their endssiidably mounted in the guides, means i'or securing the ilrst rungs in'the zussetpiatesot rthe' head section, ond rungs, and means for securing the s'e'cond rungs ;to the plates of theioot sect on. e

the ireilsj channel-shaped guides, means ,forse cui'i'ng the guides upon'theinner gusset' pletes j 'o'f the foot section ,.flrst rungs extended through the gusset pleltes oi'the head-:s'ectionand hitting their eflds slide'biy mounted in-the guidesfmeans ior securing the'flrstruns in the gussetplntes oithe head section, second rungs, and me'ans folsecuring the second rungs to the gussetplates o'f 'the' fcot section. v

i 7 some"; 7 J

"einvention-insta- V I I r tne esnue ecurmc' j j i he um tothegussef tplates ar snid-.s'ection being rin s 10-.

a; sunset-1m is v t e, posedbetw; een 3c! tp ztootm i hi nnosi e terse-w t j sn d u he mm! s mm w th a. in combination mule m zyme-the Iuidesindeecured upon the inner'ol' the root netionbyuie z n- 1m xtension-Mae's n cnted within-.thejflriml's filid 1101111118 the 2 1ml set plates oigsa idhnei semen sndithi'oughxthe "7 extensionl'e'dder .constmctedas setiorth so in claiin 2, nnd'wherein the means for the rungsinone, of the sections embodiesch'nm ,nel-shajje'd rings to thefis'n'id' located pistes- 0: 3am sectioni the rings 'c mvrisihs cutstendine'i. ticnges tubuas lar spacers between the flanges, sndsecurinmelej-r' ments passing theough zthe' snacers, the flanges q and the gusset plates oisaidon'eisectioni I e. Anextension laddericpnstru'ctedges'setforth 7 in gclaim 2,.and wherein the mesns'iorysecuringq the rungs in one section comnri'sejsle'eves secured upon the inner gusset plate of one -section, the rungs being Secured in the sleeves.

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