US361202A

US361202A - aenold

Info

Publication number: US361202A
Authority: US
Publication date: 1887-04-12
Anticipated expiration: 1904-04-12

Description

(No Model.) 2 sheets sheet '1.

D. a; R. H. ARNOLD. EXTENSION LADDER. No. 361,202. Patent-ed Apr. '12, 1887.

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- WITNESSES s a/ flwvm lg .16. M

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EXTENSION LADDER.

No. 361,202 Patented Apt. 12, 1887.

WITNESSES M Attorneys Asa UNITED STATES PATENT OFFICE.

CALEB ARNOLD AND ROLLIN H. ARNOLD, OF HONEOYE, YORK.

I EXTENSION-LADDER.

SPECIFICATION forming part Of Letters Patent No. 361,202, dated April 12-, 1887.

Application filed June 30, 1886. Serial No. 206,736. (No model.)

vented certain new and useful Improvements in Extension-Ladders; and we do declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingdrawings, and to letters orfigures of reference marked thereon, which form a part of this specification.

Figure 1 of the drawings is a representation of a plan view showing ladder folded. Fig.2 is a vertical longitudinal section of the same on line at m, Fig. 1. Fig. 3 is a transverse vertical section of the same on the line 3 y, Fig. 1. Fig. 4 is a rear sectional elevation showing ladder raised. Fig. 5 is a vertical longitudinal section of the same on line 2 a, Fig. 5; and Fig.- 6 is adetail side elevation of the ladder detached, showing the course of the pulleys and rope or chain. I

This invention relates to extensiondadders; and it consists in the construction and novel combination of parts, as hereinafter described,-

and pointed out in the claim.

In the drawings, the letter A designates the lower ladder-section; B, the next section above, and O the succeeding section. Others may be added. The lower section is wider than that which succeeds it, as the side bars of the lat-.

rise or move upward, and may be termed the base section, while the other sections are rising or elevated sections. Each of thelatter sections is provided with the slide plates G G, which are secured to the lower edges of the rails at their lower end portions and extend outward sufficiently to engage the rail-grooves .leys from the top section. are placed at or near the lower ends of the p of the section next below when said sections are in connected position. The length of these slideplates is sufficient to provide a strong purchase when the ladder is in extended position.

The sections are provided with upper pulleys, H, and lower pulleys, K, said pulleys having guards L, to prevent the disconnection of the ropes. The lower pulleys may be omitted from the base section and the upper pul- The lower pulleys rails of eachsection, on the outside thereof, and the upper pulleys, also placed on the outside, are located at a distance from the upper ends of the rails about equal to thelength of the slide plates, so that the upper portion of each groove forms a stop-seat, and there is no liability of the disconnection of the sections. Stop-pins I may be employed in the grooves, at the bottoms of the sections, to prevent the latter from sliding down too far. chain, V, extending through transverse perforations m at the lower ends of 'the rails of the upper section, engages all the pulleys of the ladder, and is connected by its ends to a Windlass, W, which may be seated in bearings of the lower section, or may be connected to a wagon-base. In the latter case it is designed to pivot the lower ends of the base section to side bearings of the wagon, so that the ladder may lie upon the wagon in horizontal position when being transported.

In order to provide means for raising the ladder, the lower ends of the base section are provided with large segment-gears S, which engage the pinions P of the shaft Z, which is seated in bearings of the wagon-frame. When the shaft Z is turned, the latter is raised to upright or nearly upright position, and then by turning the Windlass the sections can be successively elevated. 5

Keys or dogs may be used to secure the shafts in place when the ladder has been raised to the desired position.

In some cases the grooves may be made in the outer walls of the side rails, and the slideplates secured to the upper ends of said rails, this construction being the equivalent of that hereinbefore described. 7

We are aware that the several parts of our A rope or apparatus are old when separately considered, and that many of them have been combined in the manner herein described; but we are not aware that all of the parts have ever been brought together in the precise manner hereinbefore pointed out.

Having described this invention, what we claim, and desire to secure by Letters Patent, 1s-

The improved extension -ladder and means for operating the same, herein described, e011- sisting of the main frame having the windlass journaled in the side walls thereof, the shaft carrying the pinion, also journaled in the said frame, the base ladder-seetion, A, journaled at its lower end in the arc-rack to engage the said Witnesses:

EUGENE UNDERHILL, SAMUEL B. SMITH.