US1250520A - Ladder-rung. - Google Patents

Description

A. SCHREINER.

v LADDER RUNG. I APPLICATION FILED SEPT-9| 1916- Pat nted Dec.18,1917.

K "1 'INVENTOR.

" UNITED STATES PATENTOFFICEQ2 ALBERT sennnrivnn, 0F Damn-6010mm, .assrenoa rornnscrinnmnrenannnn MANUFACTURING COMPANY, A CORPORATION or COLORADO.

Lanna-none.

Specification of Letters Patent. I 18,1917

Application filed September 9, 191's: serial-Nb. 119,202.

'struction the ends of which are adapted to,

be forced into the Wood of the side rails of a ladder so as to anchor the-'rungfirmly in place without "weakening the rails between which it isapplied. I H 1 Another object of my invention is to provide in connection with rungs" ofthe improved construction, means for securing the ladder rails against spreading, and still another object isto adapt the improved rungs for use on step ladders as well as-on 0rdinary ladders. u r

\Vith the above and-other objects in View, all of which will fully appear-in the course of the following desc-ription, myinvention comprises the constructions shown in the accompanying drawings in the various Views of which like parts are similarly designated, and in which Figure 1 represents an elevation of a ladder equippedwith my improved rungs.

Fig. 2, an enlarged cross sectionof the ladder showing the rung in elevation, a

- Fig. 3, a sectional" elevation of an end of the rung before it is placed on the ladder,

Fig. 4, a side elevation'of a portion of a ladder rail towhich the rung shown-in Fig.

. 3, is attached,

v a step ladder.

Referring to the drawings by numerical characters of reference, 2 designates the side rails of a ladder, and 3 the rungs connecting the same.

My improved rung consists of apiece of sheet metal bent to form a bar of channel section. One side, 4, of the bar is preferably reduced length which is bent to slantjdownmade wider than the otlier'side, 5, of the same, mainly for the purpose of reducing the cost of production and to avoid weakenmg the ladder rail to which the rung isapplied. g l;

I The face orcross plate 6 of the rung is incised 'at its; ends to. provide two tapering prongs '7 of which the end portions of the side plates' and 5 form part, and, intermediate of saidprongaa tapering prong 8 of w ardly asshown in Fig. 3. Y Y

-'To" apply a r'ung thus formedfito the 1 I,

ladder rails, its ends are"force'dinto the 5:

wood of the rails between which itis placed,

by means of a suitablyconstructed press.

The wedge-"shapedou'ter; pron gs '7 upon entering the wood, retain their original form anchors the rung against longitudinal displacement.

' After therung'has beenQ-driven intothe while the downwardly bent prong 8 isbent 'stlll further, as shown in Fig. 4,; and thus side rails,=until the edges o'f-its cross plate between the prongs, engage the inner surfacesthereof, 1t 1's='secured"by meansof nails 9 which 'a're' dr ven'into the rails and After the ,nails'are driven home,'metal straps "lOIare secured to the rails'to'cover the headsof the nails thereb -hold them in place.

through the side plates of the rung as is best 7 shown in Fig. 5.

To still further istrengthen 'the'structure and prevent :spreadingof the-side rails of the ladder, diagonal b'races 12am secured between the rails-landthe underside of some 7 of the rungs as shown in'F-i'g'. 1,'-i;t being in rung of a ladder' of are bent atan acute angle to its cross plate to correspond to the slant of the side rails when the latter is in its working position.

most instances {suffici'entr to-a'pply ithe'se i In securing the rung between the rails of a step-ladder, one of its side members is. placed in engagement with the edges of the side 7 posedpartiallyof the-side flanges of the 7 channel bar and partially ofportions of the webor face of tlrebar adjoining said flanges, are particularly adapted to withstand downward pressure and thereby .holdthe rungs against "displacement by the users weight.

rH-aving thus describedmy invention-in the best form atpresent known tome I desire itunderstood that modifications other than those mentioned in the foregoing "de scription, may be resorted within the spirit of l nyinven'tion asset forth in'the following claims.

LA ladder-rung comprising" a bar havingat each end, two outer 'prongs-and between the same aprong slanting from the frame of said bar, said prongs beingadapted to' be forced intothewood of side rails of a ladder between which 'the rung is placed.

a A ladder rung-coinprisingabar having at each end twog outer prongs'and: between the same ashortenprong slanting from the plane of said bar, saidprongs being adaptedto be-forced' into-the wood of side rails of a ladder between'which the rung is placed.

3.Aladder-rung comprising a bar-having at eachend'two putenprongs and between the-'same,a shorter, downwardly slanting prong, said prongs being adapted to be forced into the woodof said rails ofaladder between which therung is placed.

4. A ladder comprising a pair of side wooden rails,;and rungs composed of metal channel bars having at-t-heir ends integral prongs slanting from -thea planes of the =resp'ective bars which are forced into the substance of said rails.

"5. A ladder-rung comprising a bar havi'ng-at-ea ch end a prong extending substantially parallel with the plane of the bar, and a prong slanting from said plane, said prongs being adapted to penetrate wooden side rails of a ladder, between which the rung 'is 'placed.

6. A ladder rung comprising a channel bar having at each end three outwardly projecting integral prongs formed by incisions of: its cross member and adapted to penetrate'wooden side-bars ota ladder, between which the rung is placed, the middle prong at each end of the channel bar slanting from the-plane of the "same.

l. A ladder rung comprising a bar hav- '1ng' at-1ts opposite -ends,nitegral prongs which slant dlvergently from the plane of the bar and are adapted to penetrate wooden side-rails of a ladder,- between which the rung is placed.

1 8. A ladder comprising wooden side-rails,

and metal rungs having at their ends outwardly projecting prongs which are forced into the side rails and slant divergent-1y downwardly from the planes of the rungs;

"9. A ladder comprising a pair of wooden side rails, and metal rungs made of channelbars of a width less than that ofsaid side- ALBERT SCHREINER.

Witnesses L. RHOADES, Geno.

Copies of this patent may be obtained tor nvetents eaeh,;by addressing the Commissioner of latents,

washington, D. G.

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