US227312A

US227312A - Ladder

Info

Publication number: US227312A
Authority: US
Publication date: 1880-05-04
Anticipated expiration: 1897-05-04

Description

NITED STATES PATENT OFFICE.

JOHN L. SIPPY, OF VENICE, ILLINOIS.

LADDER.

SPECIFICATION forming part of Letters Patent No. 227,312, dated May 4, 1880.

Application filed October 21, 1879.

To all whom it may concern Be it known that I, JOHN L. SIPPY, of Venice, in the county of Madison and State of Illinois, have invented a new and Improved Ladder, of which the following is a specification.

The object of my invention is to furnish a simply-constructed, light, and easily-worked extension-ladder.

Figure l is a sectional side elevation of my improvement. Fig. 2 is a front elevation of the same. Fig. 3 is a cross-section of theladder, taken on line aw of Fig. 2; and Fig. 4 is an end elevation or view of the sections of which the ladder is composed.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A is the bottom section of the ladder, supported on legs B B, in which is pivoted horizontally a Windlass, 0, provided with a crank, a, and a ratchet, b, in position to be engaged by a pawl, c, pivoted to a cross-bar, (1, connecting legs 13 B.

In section A is a deep longitudinal groove, 6, and to the face of the section, on either side of groove 0, are fixed metal plates ff, which extend part way over groove 6, as shown in Fig. 3. In the upper end of section A is a recess, f, (indicated by dotted lines,) in which is pivoted a grooved pulley, g.

D is a movable or sliding section, having on its under side, next to section A, a metal faceplate, h, and near its lower end a tongue, i, which projects between and under plates f f into groove 0, and serves as a connection between sections A D.

E is a rope attached to Windlass O, and running up under section A into recess f, over pulley g, thence down through groove etc the lower end of section D, where it is fastened at j.

At the upper end of section A, on each side, are plates F, the projectingportions 75 7c whereof are turned over at right angles, so as to bear on the edges Z l of plate It. A groove, m, is cut in the section D just over the edges l, to allow the ends it opposite F to bear on edges 1 l. The plates F, bearing against the edges 1, serve as guides for the section D, and the bent ends is assist the tongue 2' in holding the section D in connection with the section A.

G is a folding leg pivoted to the under side of section A at n, so that it can be folded against section A or thrown out to serve as a brace for sustaining the ladder in an inclined position, as in Fig. 1. On each side of sections A D are projecting steps or rungs H, supported by brackets l.

When the ladder is set up, and it is wished to extend it, the rope E is wound on the windlass O. This draws section D up, thus adding its length to that of section A. It is retained in its extended position by the pawl c engaging ratchet b. To lower the extended section D, release the pawl a and turn the Windlass backward. This permits section D .to slide down section A until the tongue i reaches the end of groove 0.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- An extension-ladder consisting of the single-bar sections A D, provided with the steps or rungs H and the brackets l, substantially as shown and described.

JOHN LOVELL SIPPY.

Witnesses:

GHAs. S. YOUREE, RUDOLPH HAMMACHER.