US309626A

US309626A - johnson

Info

Publication number: US309626A
Authority: US
Publication date: 1884-12-23
Anticipated expiration: 1901-12-23

Description

(No Model.) i

' A. J. JOHNSON.

STEP LADDER.

No. 309,626. Patented Deo. 23, 1884.

w .E .mm vw ad y ,E

' @ai www,

arnnir rivier.

ANDREXV'J. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO JAMES O. GARDNER, OF SAME PLACE.

STEPm-LADDER.

SPECIFICATION forming part of Letters Patent No. 309,626, dated December 231, 1884.

Application filed May 24, 1884.

To @ZZ whom, it may concern/.-

Beit known that I, ANDREW J. JOHNSON, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Step-Ladders; and I do hereby declare that the following is a full, clear, and exact description t-hereof, reference beinghad to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to stepladdcrs having legs or braces pivoted at the upper end or at the bracket/7 and primarily concerns the devices for the arrest of the legs in their extended position.

It consists in certain features of construction, hereinafter described, and pointed out in the claims.

In the drawings, Figure l is a perspective view of a step-ladder constructed in accordance with my invention. Fig. 2 is a fragmentary side View enlarged. Fig. 3 is a horizontal sectionv through as a of Fig. 2. Fig. 4 is a perspective view of one desirable form of metal support for the pivot of the step-brace.

A A are the step uprights or standards. B is the top strip or platform. O O are brackets rigidly secured to the inner faces of the step-standards and to the under face of the step B. D D are the legs or braces, pivoted at d to the outer faces of the brackets O O, at the rear of the standards. The brace-legs are pivoted to the brackets C O, preferably at such points upon the latter as to fold rather closely against or near the rear edges of the step-standards, as indicated by dotted lines in Fig. 3, and at a distance of a few inches from the upper ends of said legs. To permit the said legs, thus pivoted, to be thrown outward, the stepstandards are cut away at the rear of their upper ends, forming faces a, of such an inclination as it is desired to give the legs and standards when extended. This allows the upper ends, d', of the legs to move forward as the feet thereof are thrown back, and the said inclined faces a of the standards form stops, which arrest the legs in their extended position. The usual contrivances of toggle-links, hooks, or cords for preventing spread of the ladder when in use are thus dispensed with, not only cheapening the construction of the ladder materially, but rendering its manipulation very convenient and adding to its durability.

(No model.)

The pivotsupporting plates, as herein shown,

are riveted or bolted to the standards A, and are upwardly extended and appropriately formed to also fasten to the under side of the step I3 by screws. Each of said plates is further shown as having its rear vertical edge turned inwardly to form a. flange, e, which rests against the bracket. Thus constructed, the parts joined mutually strengthen each other materially.

' The plates E may be of sheet metal or of malleable iron, as preferred.

As shown, the brackets O are of wood, nailed both to the step-standards and to the top step, B; but they may be of malleable iron and secured to the several parts in the usual way .by screws or otherwise.

The pivoted pail-shelf F is constructed with armsff, which engage the adjacent steps, a', in a familiar manner, to hold the legs eX- tended, and nothing is independently claimed upon this feature of the ladder.

I claim as my inventionl. The combination, with brackets O O, and brace-legs D, pivoted below their ends to said brackets, of step -standards secured to the brackets and beveled to form stops for the upper ends of the legs when the latter are eX- tended, substantially as described.

2. The combination, with the brackets,

brace-legs pivoted thereto, and the beveled stepstandards secured to the brackets on the same side thereof as the legs, of plates E, supporting the ends of the pivots, substantially as described.

3. The combination, with the brackets, the top step, brace-legs pivoted to the brackets, and beveled step-standards fixed to the brackets, of fixed pivot-plates E, secured to the standards and top step, substantially as described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

ANDREW J. JOHNSON.

IVitnesses:

M. E. DAYTON, OLIvnn E. PAGIN.

IOO