US92708A - Robert r - Google Patents

Description

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@anni chimica ROBERT R. CROASDALE AND PETER RINK, OF REAVILLE, NEW

` JERSEY.

Letters Patent No. 92,708, dated'fuly 20, 1869.

. IMPROVED AID-TU' STABLE ASTEP-LAIDDER.

The Schedule referred to in these Letters Patent and making part of the B ame.

To all 'whom/it may concern:A

B e it known that we,`RoBEnT R. CRoAsDALn and PETER RINK, of Reaville, in the county of Hunterdon, and State of New Jersey, have invented a new and' improved Adjustable Step-Ladder; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use'the same, reference being had to the accompanying drawing, forming part of thisspecification.

The drawing represents a sectional side elevation of lour improved adjustable step-ladder.

This invention has for its object to construct a stepladder, en which the steps can be adjusted into a horizontal position, whatever may be the degree of elevation'of they ladder.

The invention consists inipivotng each end of each step in two side-bars, so that the latterwill beadjustn able, to, set the steps at any angle to the bars, and in providing a brace-flame, which has an lip-and-down adjustable connecting-rod. Y

A A, in the dra-wing, are the steps of our improved ladder.

Each step has two tenons, a a, projecting from each end, and is,-by means of thesame, pivoted to two sep; arate pairs of sidebars, B G. The brace-frame D is, at its upper slotted end, piv# oted to the inner bars, C.

The sideLbars Aof the brace-flame have notched slots',

a, in which a cross-bar, b, can be adjusted upv and down.

A rod, E, for connecting the middle portieri of the brace-frame with one of the steps A, is secured to the cross-bar l).

When the height of the ladder, and the consequent inclination of the side-bars BC, are determined, the brace-frame is connected with one step by the rod E.

The length of the bars B O is such, that when both are made to touch the ground, the steps will be level, or nearly so, as indicated by red-and black lines iu the drawing.

The higher the ladder is made-that is to say, the more the distance betweeuthe lower ends of C and D is reduced-the more is the cross-bar b setdown, as shown.

Having thus described our invention,

What we claim as new, and desire to secure by.

Letters Patent, is-

The adjustable step-ladder, which consists of -the steps A A, of whichI each has two pairs of tenons, of

the double side-bars B O, slotted brace-frameD, up-

and-down adjustable cross-bar brand connecting-rod E, all combined and arranged substantially as herein shown and described.

' 'ROBERT R. CROASDALE. Witnesses: PETER RINK.

R. W. HUNT, JOHN J. SUTPHIN.

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