US1445573A - Ladder - Google Patents

Description

Feb. 13, 1923. 1,445,573.

` M. A. WILFORD.

LADDER.'

FILED APR. I8. i921.

`irarenee renin, iena irritants n. Writroian, or nivnnranzts, wrscoiisnii.`

LADDER.

`Applicaton filed April 18, 1921. Serial No. l162,106.

. To` all eli/om 'it nfl/ag] concern:

Be it known that I, MEARLE A.. llinronn, a citizen ot the UnitedStates, residing at River Falls, in the Stateor' Wisconsin, have inven ted new and useful improvements in liadders, of which the following isa specification. f

provision of a step-ladder wherein metallic rungs are combined With'ivooden sides or stilesin the production oitaladder that pos` sesses the desiredstabihty, and is also excep tionally light `in comparison to its strength. One ot the chiefcharacteristics of the in `fcntion resides in the manner ot associating the rungrs with the sides ot the ladder, so as to ijn'event the rungs "from being casually separated from said sides, which insures ety in use ot' theladder.` More specilically stated, t-.he invention contemplates the provision of metallic rungs,

which terminate to provide prongs adapted" to penetrate thesides ot the ladder and` have their `ends clinched against the outer side thereof.

" The nature and advifuitages ot'the invention will` be better understood when the fol- Vlowing detailed description is' read in con nection With the accompanying drawing, the

invent-ion residing in the combination, con`- y struction, and arrangement `of parts as claimed. 4 i i i In the drawing torinlng` part oit this ap plicatiou, likev numerals of reference indi-` fate similar wherein Figure 1 is a View in elevation of the ladder constructeril in accordance with iny, in- "\'ent1on.

Figure 2 is a sectional View taken on line tlf-2101? Figure l. y

Figure 3 a 'fragmentary edge elevation. Figure fl is a vieni ot one ot the rungs. Referring `to the drawing in detail, l() in# dientes the opposed sides oi the ladder,

which are connected together by rungs '11.

The `sides l0 are preferably constructed ot wood, while the Vrungs l1 `are constructed parts in the several views and from nietal to provide a ladder possessing,r strength and rigidity. While the rungs may vary in cross sectional coniiguration, they are preferably of .hollow or tubular construction, the diameter ot the rungs depending` upon the size of the ladder as a Whole. The

l rungsv `The present invention contemplates the ll are biturcated at `their ends pro-` vidinginner spaced parallel Walls and in clined Walls tapering from the outer' end ot the spaced parallel WallsA to provide prong i3 and defining thereby outwardly and oppositely inclined spreader Walls, which penetrate the sides l() oftheiladder and have their `ends subsequently bent or clinched against. the outer surface ot said sides. In addition to the .'tact that each end may be proifided :with any number of: prongs, these prongs may also vary in length according` to the thickness ot' the sides l0. lilanitestlyu, l haveprovided a ladder which eliminates the danger ot a rung breaking or separating; itself from the sides l() thereby insuring' safety in use ot the ladder. I

Vilhile it is believedthat trom the toregoing' description the nature and advantages of the invention `will be readily apparent, lf desire to have `it understood that I do not hnnt i'nysel't to what 1sv here shown and described," and that such changes may be `re'` `and inclined Walls tapering' from the outer i end ot the spaced` parallel Walls defining;4 spreader Walls thereby, each biturcated end constitutingl prongs piercingone ot' the side members, said prongs being deflected outir rdly and terminatingbeyond the outer suriace ot each side member with" the endv oit each prong bent against thesurtace o t the respective side member.

ln testimony whereof ljaiiix n'ly surnatiu'e.

Images