US808124A - Step-ladder. - Google Patents

Description

PATENTED DEC. 26, 1905.-

J. S. TILLEY. STEP LADDER.

APPLICATION FILED APB..17.1905.

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PATENT OFFICE.

JOHN S. TILLEY, OF WVATERVLIET, NEW YORK.

STEP-LADDER.

No. 808,124. Specification of Letters Patent. Patented Dec. 26, 1905.

Application filed April 17, 1905. Serial No, 255,933.

To all whom it may concern:

Be it known that 1, JOHN S. TILLEY, a citizen of the United States, residing at ater- ,vliet, in the county of Albany and State of New York, have invented certain new and useful Improvements in Step Ladders, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to step-ladders, and has for a primary object the provision of a device of this character possessing, generally speaking, the desirable characteristics of the tripod or three-legged type of ladder and provided with improvements rendering the same strong and durable, as also sufliciently rigid, to resist loosening or separation of the parts, whereby to overcome the tendency of either of the fore legs or feet to creep or spring out of their normal alinement under torsional stress to which tripod ladders are subjected, with the resultant effect that the ladder is under comparatively short use impaired to such an extent as to at least become noticeably unsteady and frequently dangerous.

iVith the above-stated object in view a convenient embodiment of the invention comprises a step-ladder having two forelegs and a relatively centrally arranged back leg, the back leg being pivotally connected at its upper end to the upper ends of step-supporting bars, and said bars and the steps carried thereby being in turn supported by the fore legs secured thereto and projecting laterally therefrom in a divergent manner to constitute the base of the ladder, in combination with a series of broad flat steps mounted between the side bars and extending for the greater portion of their length, and combined brace rods and steps passingthrough the lower ends of the side bars and the fore legs and secured thereto.

The novel details in the construction and arrangement of the several parts of the ladder will be apparent from the detailed description hereinafter when read in connection with the accompanying drawings, forming to corresponding parts in the two views, A designates the ladder proper, the same comprising relatively wide side bars a and broad ilat steps a of a width substantially that of said side bars and firmly secured at convenient distances apart therebetween. At the upper end of the portion A of the ladder is mounted the usual top piece or platform B, to which is pivoted a back leg C, the latter being arranged centrally of a pair of fore legs D. These fore legs are approximately the same width as the side bars a and are secured directly thereto at their upper ends at points relatively near the lower end of the side bars and diverge outwardly therefrom, as clearly indicated in Fig. 1, to provide bearing-points (Z at a distance apart much greater than the width of the ladder proper. That the portion A of the ladder may be rigidly supported upon the fore legs D and also that said fore legs may be firmly braced I provide thelower ends of the side bars a and the braces E with alined apertures c of a shape and size to reand steps E, the same being held in place by a snug engagement between the same and the walls of the apertures e and also through the medium oflo'cking-pins F, passing through the side bars a and fore legsDinto said bracerods. Owing to this arrangement any lat eral loosening or play of the brace-rods is absolutely prevented, and consequently the fore legs cannot creep or spring out of their normal alinement, thereby effectually overcoming this disadvantage, which would be incident to the ladder were the brace-rods secured to the front or rear edges of the side bars a and legs D. The arrangement also enables the construction of the parts just described within the width of. the side bars a, which will permit close folding of the back le B.

It is to be understood that changes and alterations may be made in the particular embodiment of the invention herein disclosed without departing from the spirit of the invention.

'Ilaving thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, 'is

A step-ladder comprising a pair of relatively broad side bars a carrying therebetween a series of broad ilat steps a, extending for the greater portion of the length of said side bars, a pair of correspondinglybroad fore legs D secured to said side bars ceive and encompass combined brace-rods IIO and diverging downwardly and outwardly therefrom and for some distance therebelow, the bottom ends ofsaid fore legs being free and bordering an unobstructed space beneath the side bars, the lower ends of the side bars and the fore legs being formed witha plurality of series of alined circumferentially-inclosed apertures e, brace-rods E formed complementary to and passing through said aper- 7 tured portions of the side bars and fore legs and confined against lateral movement in any direction by the walls surrounding the said apertures, means for preventing 1ongi- JOHN S. TILLEY.

WVitnesses:

RosE LEAoH, RUTH D. TANNER.

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