US1109228A - Step-ladder. - Google Patents

Description

1). A. HOUSTON.

STEP LADDER.

APPLICATION FILED APR.6.1912. RENBWEDJAN.21,1914.-

1,109,228, I Patented Sept. 1, 1914.

WITNESSES: IN VENTOR.

B Y 1 v 7m 7 1 ATTORNEY.

Int; AORRIS FETLRS 60., PHOTO-LITHQ, WASHINGTON. Dv C,

UNITED STATES PATENT orFroE.

DALLAS A. HOUSTON, OF SPRINGFIELD, ILLINOIS.

STEP-LADDER.

Application filed April 6, 1912, Serial No. 688,883. Renewed January 21, 1914. Serial No. 813,550.

To all whom it may concern:

Be it known that I, DALLAS A. HoUs'roN, citizen of the United States, residing at Springfield, in the county of Sangarnon and State of Illinois, have invented certain new and useful Improvements in Step-Ladders, of which the following is a full, clear, and

exact description, reference being had to the a is a side elevation with parts broken away;

. Fig. 3 is a sectional detail on the line 3-3 of Fig. 2; and Fig. .l is a cross-sectionflon the line H of Fig. 2. I

The object of my invention is to construct a step-ladder, the ladder section'of which shall be composed of a single piece of metal,

thereby reducing the number of parts of which the same is formed, theprop' memher being preferably composed of metal, though not necessarily so. i

A further object is to provide a ladder of the character described which shall be simple, durable and cheap to construct.

The advantages of'the inventionwill be more readily apparent from a detailed description thereof which is asfollowsa-Referring to the drawings, 1 represents an inverted U-shaped frame or member composed of light metal, the sides of the frame having cut therefrom sections or tonguesa, a, of convenient length, so that when the free ends of two opposite sections (previously Specification of Letters Patent. Patented $913131, 1914, f

they jointly form a rung or step ofthe lad A der frame, the rungs and frame proper thus M forming for all practical purposes a single piece of'rnetal. The cutting or punching of thetongues or leaves solid portions 2) between; the ends of the rungs or. "steps thus formed,

so that the strength and stifiness of the sides of the ladder are no'tmaterially affected. A I ladder thus composed of a single unit of" metal will last indefinitely and will stand a much abuse and long wear. .Hinged to the ladder section aforesaid isa prop or frame composed of'side members 2, 2, connected by cross-braces 3, 3, a strap '4: connecting the,

braces attheir intersection serving as an anchor for oneiend of a chain 5 whose opposite end is securedin any mechanical manner to one of the rungs or steps of the ladder frame. The chaln of course, limitsfthe degree of angular separation betweenthe f ladder and its supporting prop or frame.

Having described my invention, what I metallic frame, the sides thereof having sections or tongues cut therefrom, said tongues being opposite one another and bent at right angles toth'e said sides, the free ends of the tongues being welded together to form rungs or steps.

In testimonywhereof I mysignaj ture, in presence of two witnesses.

WVitnesses: a

W. C. KILLEEN,

BROCKMILLER.

Copies of this patent may be obtained for five cents each, by addressing'the commissioner o f"Patents, 7

Washington, I). C.

DALLAS AVHOUSTONQ I A A ladder compr1s1ng an nverted U-shaped

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