US1134087A - Ladder. - Google Patents

Description

E. MATHEWS; E. G. .GHEMWETHla LADDER.'

APPLIUATION FILED OUT-.7, 1914.

z SHEETS-SHEET a.

Patented Mai'. 3Q,

@Macway Application iez Gambe? ff al a0/"wm mail! emmene:

Be ii; .known @het We, FRED MAH-EWS and DWIN G. Cfzewowe'fegeisizem ofthe United tetes, am?. denis of Cheage en@ Blue slend, espee'vevrin the eeun-y ef Cook and Sate of ineis, have invented new and 'useful mpfovemens in Ladders9 el While the oewng is full, clear, am?. eXee; de'- scrpton.

@ur invention relates t, ladders that ere pazteuery ed@ for uae on :zegh eere.

The @3Q-jee?. ef infenion is to prevfe e smpj/ consxueted sreng e116. durable me'al adfer the (ms of rungs of which are asezlee. ee-les heesf in such the dspeeemen thereof lenghwise or sidewse prevembed, ene. 4mm ing megs on their @Wn aries, or 'the vibraon hezee is entirey avoided. This We mempish by ehe means hereuafef ujy deserbec'l.` and as peneularly pone ou?, in the claims.

he QD s iff. l of lewe? breken away slmar te ne shown in Fin: 4 showiug in dotted lines the posiion of @he rung when. l'rs inserted zwei drewx co e arge'f scale. Fig. 6 is e secen of moe form of side re similar "that shown in Fig. 5. Fig. Z s a simie View of yet enothe mec'- ation. Fig. B is e. section of yet enothe' modificason te 'Jflee shew/m in Fig. eue with e mg ment of e Fmg heeo: used in eonneeon herewh. iff. .1 is a perspective View of e legment m th. s de-Te of our'nvenon.

'lle drawings, A, A, epre sent the angie-imm parallel sceres or frames of the aer, and B, B, ghe meta rungs thereof. These mils are piece@ so thai one of Ybhe zmges a of eeeh l will project toward and be at fight angie-s te ehe supporfJ to which the lacer is attached, and the other Harige of each rail will project toward. the 'wie Peil pereel ae sei@ supesges a of seid fails se cut away et the upper sur?. owe ends thereof ge-roje ms, subsi D mete reds he ends -eee rees a.. @ffy-s portieri a? e elige?, sseme bey/Ye* as right lles ei selel been a wub 'he enhe inn surface e Beween my f the 'fmges c3 e' L1e soles are mae, web L' to ferm e. gue m'- curved surface efe' ehe Trim set poion is seated, me tion of said Hnge on #se side heles between (che run of the :.mge---eu is buged om me io fofm e reverse gutee er see?, Q' in mumi sulnu fece of img-e fee surface of ehe extremities e En order te j erefen of 'ehe ende of :megs Y happen owing emeess e? mensip, We pee, when of the enges of me form seats or gutzers j", "Le tem of said 01 gutehe pane ihe omer suY substamey es shown, when one mii is secureci to suppm and the ese M5 ends of the mugs are nseed bhrough hoes c, said wings are ci: posed subseley at right mpjes @he eue-be. fzmge ef the mi and Cahen the ebhe will slipped. (wel: U ,-ff' rum-- i parallel with the support until the relative xpositions of said rails to the rungs'is the same. The unattached rail on the outer ends of the rungs is pushed toward and against its support and secured thereto in such manner as to seatthe ends of the rungs in gutters or seats f, holes c and inverted gutters g. In thus assembling the ladder, the rungs bear hard against the inclined surface of the bottom of the gutters f, which latter, while resisting the efforts to bring the rungs parallel to the support of the ladder, yield to a certain extent, and malte the outer extremity of the rungs bear outward against their seats g and securely hold and clamp the ends of the rungs, and prevent any vibration thereof independent of the side-rails.

ln Fig. 6 we show a modified form of our invention. This vmodification does not require any change in the construction of the rungs B, except the slight lengthening of the offset portions D thereof, and the only change in the construction of the rails is in the omission of the reverse seats g, shown in the first five figures of the drawings..

ln Fig. 7 we ,show yet another modification of said ladder which differs from that shoun in the preferred form to the extent of omitting the seats j andi-retaining' the reverse seats gin the rails G thereof.

ln Fig. 8 we show yet .another modification in which the angle-iron rails are disosed so that the flanges G thereof that are of the ladder are placed next said support, and the other flanges 7 thereof project outward. These llatter flanges 7 are provided with rung-holes 8 at about their centers of width, and between these holes and the free edge thereof its web is provided'with a transverse glitter or seat on the side opposite that from which the horizontal flange projects, and between said rung-hole and the inner angle of the rail the web is provided with a reverse transverse gutter or seat 10, shown only in dotted lines. The ends of. the rung 2 are crooked somewhat, similar to that of a lshepherds staflthat is they are a distance corresponding to the distance bctween the free edge of flange 7 and the rung-hole; said ends are then given a return bend 3 of sufficient length to pass through said rung-hole and then have their extremities l bent transversely again parallel to the axis ofthe first mentioned transverse portion of the crook. The ends of the rungs Q are inserted through holes 8, as shown in the drawings, and when the rails of the'ladder are fastened to its support the extremities @and the first mentioned transverse portions of the crooked ends of the rungs bent transversely for4 will seat themselves in the transverse seat 9 in flange 7 of the side-rails and be securely held therein against displacement.

lf desired, the bottom of seat 9 may be inclined toward the rung-hole 8, and when the latter is set up may yieldingly resist the pressure of the rungs and securely hold the ends of the same against vibration.

What we claim as new is:

1. A. ladder comprising metaly side-rails having flattened portions provided -with rung-holes therein and depressed transverse seats leading from said rung-holes, and metal rungs that have offset end portions that are adapted to extend through said holes and engage, said seats.

'2. A ladder comprising metal side-rails having a portion flattened parallel to the support thereof and provided with rungholes therein, and depressed transverse seats leading from said rung-holes, and metal rungs that have offset end portions that are adapted to extend through said holes and engage said seats.A

3. A ladder comprising angle-iron siderails one of the flanges of' each of which is parallel to the support thereof and provided with suitable rung-holes and depressed transverse seats therein between said holes and the free edge thereof, and metal rungs that have offset ends that pass through said holes and which engage said seats.

4. A. ladder comprising angle-iron siderails each having a portion that is parallel to the support of the ladder and provided with rung-holes and with depressed transverse seats leading from said holes the bottoms of which are inclined, and metal rungs that have offset portions that are adapted to extend through said holes` and which engage said seats.

5. A ladder comprising angle-iron siderails one of theflanges of each of which is parallel to the support of said ladder and has rung-holes in the same and opposite depressed transverse seats extending from said holes; one of said seats being made in the inner surface of said flange between the hole and the angle of the rail andthe opposite seat being made in the outer surface between the hole and the free edge of the flange and having its bottom inclined.

ln witness whereof we have hereunto set our hands this 29th day of September, 1914:.

lVitnesses:

FRANK D. THoMAsoN, Ftonmuin MiTCi-mtr..

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