US449159A - Collapsible ladder - Google Patents

Description

(No Model.) 7 Y W. W. HARRIS. GOLLA PSIBLE LADDER;

N0. 449,159. Patented M.a.r.'31, 1891.

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[\JESSES AT'fd NE/S UNITED STATES ATENT- OFFICE.

WILLIAM \V. HARRIS, OF CIIARLES'IOIVN, NEIV HAMPSHIRE.

COLLAPSIBLE LADDER.

SPECIFICATION forming part of Letters Patent No. 449,159, dated March 31, 1891.

Application filed October 13, 1890. Serial No, 367,892. (No model.)

To all whom it may concern.-

Be itknown that I, WILLIAM W. HARRIS, of Charlestown, in the county of Sullivan, State of New Hampshire, have invented a certain new and useful Improvement in Collapsible Ladders, of which the following is a description sufficiently full,.clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front elevation of a section of my improved ladder represented as open; Fig. 2, an edge elevation of the same; Fig. 3, a longitudinal section of one of the rungs.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates especially to folding or collapsible ladders; and it consists in certain novel features hereinafter fully set forth and claimed, the object being to produce a more simple, cheap, and effective device of this character than is now in ordinary use.

The nature of the improvement will be readily understood by all conversant with such matters from the following explanation.

In the drawings, A represents the side bars, and B the rungs. The side bars are preferably rectangular in cross-section, and the rungs B are pivoted to one face thereof by means of split pins (1. These pins have an eye f, adapted to encircle the rungs and rest in a groove g, (see Fig. 3,) the body of the pins passing horizontally through the said bars A. A ring it is passed onto the points of the pin at the face of the side bars opposite the eye f and the split points z of the pins are spread, as shown in Fig. 2, preventing said pins from being Withdrawn from the said bars While permitting it to rotate freely thereon. One or more of the rungs B are extended to project beyond the said bars A, as shown at m in Fig. 1, and, to each side bar a hook p is pivoted in position to overlap the end of said rung and prevent the ladder from accidentally collapsing when open.

The ladder as thus constructed is exceedingly durable, only a small hole or opening in the side bars being necessary to receive the pins d, and the strain resulting from'weight on the rungs being in a line parallel to said holes instead of at an angle thereto, as when the rung is inserted directly in the side bars, as in ladders of ordinary construction. The pins may readily be removed to replace a broken rung without detaching the side bars from the remaining rungs.

Having thus explained my invention, what I claim is- 1. A collapsible ladder com prising side bars and rungs pivoted thereto by split pins, arranged substantially as specified.

2. In a collapsible ladder, the side bars in combination with grooved rungs, and the split pins d, having an eye ffor receiving said rungs, all being arranged to operate substantially as described.

3. In a device of the character described, the side bars A, in combination with the rungs B, provided with the grooves g, the pins d, fitted to rotate in said side bars and provided with an eye f, and the rungs h for securing said pins.

4. In a collapsible ladder, the side bars connected by rungs pivoted thereto by split pins passing through said bars, one or more of the said rungs being extended beyond the bars to receive a hook or catch, substantially as and for the purpose set forth.

WILLIAM W. HARRIS. lVitnesses:

- EDWARD OLOOTT,

GEORGE OLOOTT.

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