US376794A - Extension-ladder - Google Patents

Description

(Nlo Model.) I

- H. BARNS.

.EXTFlxIsIolvv LADDER.

No. 376 794. x Patented Jan. 2 4, 1888.

1 l j www# SAW/MMM NITED STATES PATENT ''FFICEo n' HOSEA BARNS, OF KENOSHA,`WISCONSIN.

SPECIFICATION forming pm of'Leners'Patent No. 376.794, dated January 24, lesa.

Application filed November 17, 18:37. Serial No. 255,398, (No model.) i y i nosha, in the countyof Kenosha and State o f Wisconsin, have invented new and useful Improvenients in Extension-Ladders; and I do hereby declare the following tobe a full, clear, and exact description of said invention, -reference being hadv to the accompanying-drawings, and to the letters or figures of reference marked thereon, which form a part of this speciication.

My invention consists in the peculiary form and construction of the various parts and in the combination of theparts in a united mechanism.

In the drawings, Figure l shows my exten sion-ladder in three sections, but combinedv and arranged for selfsupport. Fig. 2 shows a portion of two sections of my ladder, exhibiting, particularly, the means for and method of securing two sections together in a straight ladder. Fig. 3 shows two sections ofthe ladder united, parts being broken away to show the relative position of other parts. l .v

In the drawings I have shown a ladder coinposed of three sections, AB, and C; but the ladder maybe made up of two or any greater number of sections. The side bars ofthe ladder, D, D', and D, are connected together in the' usual way by rigid rounds E, F, and G, which rounds form the steps of the ladder. rIhe upper end of each of the two side bars of each section, except the top one, is .provided with a longitudinal slot or recess, H, centrally laterally extending from the end into the bar a distance equal to the distance that two rounds are apart from each other. These side bars are, for the purpose of securin g strength with lightness, preferably constructed of wood, and on the outside Vof the bars of the lower sections andopposte to the recesses H, I attach and i and neatness of construction.

fix permanently to the bars metalplates I I, for the purpose of securing greater strength tance equal to the thickness of the side bars,

forming'pins or stays, and these outer ends of the rounds or stays K K are adapted to enter and rest in the recesses H II. The side bars The two lowerV of each section of the ladder above the lowest one are so much nearer together than theside bars of the section next below'it as equals the -thickness of the side bars, whereby the side bars of section C are adapted to slide inside of the side bars of section B, and the side bars lof, section B are adapted to slide with/in and between the side bars of section A; 'Ihe lower end of each of the side bars of each of the sections abo-ve the'lowest one isprovided with a recess, L, adapted to receive and fit upon the highest round of the next lower section, so that it will be seen Vthat when the sections are joined together end to end, as thefsections B and C are in Figs. 1 and 3, the ends K K of the two lowest rounds of the upper section, C, willv be within and be retained by the'side of the recess `H, while the uppermost round'offthe -lowersection, B, will be within and retainedbyl the sides'of the recess Lin the side ,bars of' the upper section, whereby a strong splice is made upon and in connection with three rounds ofthe ladder. To secure the sections of the ladder together, two hooks, M M, are pivoted one to the inside of each bar ofthe lower sec-` tion, A, at such point and in such manner as to hook upon and grapple the end K of the round of the next section between the adjoin` ingl sides of thesidebars of the two united sections. These hooks, for convenience yof manipulation, are each provided with flange,

attached, as shown i-n Fig. 3. The sections of connected together endto end, making a con- `tinuous straight ladder; or twojor more'secytionsfmay be put together end to end, as are sections C and `Bin Fig. l,`and a` third sec-` tion, A, may be used for a foot, as shown in Fig. I, thereby forming a self-supporting ladder. For the purpose of this self-supporting `ladder I provide braces OO, hinged or pivoted at one end to the respective side bars of one section and at'the other end hookinginto eyes or staples secured in the side bars of an'L other section of the ladder. These braces for in the bars, to which they are hinged,as shown in Fig. 2. The recesses I P (shown in `when not in use are supported in eyes there- ,A

roo H the side of the bars kof section G) are for use 85 l this ladderare intended and adapted to be when my ladder is combined in a form of stepladder not herein shown or claimed.

What I claim as new, and desire to secure by Letters Patent, is-

1. In extension-ladders, a lower section of the ladder, in which the upper ends of the side bars are each provided With a recess, H, and with a metal plate, I, in combination with another section of the ladder, having its side bars at such a distance apart as to be adapted to just slide Within the side bars of the next lower section of the ladder, and having the outer ends, K K, of its two lowest rounds extend beyond the side bars, forming stays adapted to enter the recesses H H, and being provided with recesses L L in the ends of its side bars, substantially as described.

2. In extension-ladders, a section of the ladderB and therein the rounds F F, the ends of which extend beyond the side bars, forming the stays K K, and the recesses L L in the lower ends of the side bars, in combination with the section A, the recesses H H in the upper ends of its side bars, with plates I I, secured to the ends of the side bars opposite to the recesses H H, and the hooks M M, pivoted to the side bars of the section A and adapted to engage the lowest round of the section C, substantially as described.

Y 3. In extension-ladders, asection of the ladder B, constructed and adapted to slide inside of `a section of the ladder A, the stays K K on the section B, adapted to enter the recesses H H in section A, and the side bars of section B, adapted to rest on the upper round ofthe section A, in combination with the hooks M M, pivoted to section A, which hooks are provided with knobs N and are adapted to engage the outer ends of the lower round, F', between the side bars of the section B and section A, substantially as described.

4. In extension-ladders, a foot-section, A, provided with recesses H H, plates I I, hooks M M, and braces O O, in combination with an upwardly-eXtending section, B, having stays K K entering recesses H H in section A, and being secured to foot-section A by the braces O O and hooks M M, substantially as described.

In testimony whereof I aix my signature. in presence of two witnesses.

HOSEA BARNS.

' Witnesses:

S. N. BARBER, SAMUEL Y. BRANDE.

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