US1357171A

US1357171A - Ladder

Info

Publication number: US1357171A
Application number: US328398A
Authority: US
Inventors: Charles W Krathwohl; John F Coveny
Original assignee: KRATHWOHL Manufacturing Co
Current assignee: KRATHWOHL Manufacturing Co
Priority date: 1919-10-04
Filing date: 1919-10-04
Publication date: 1920-10-26
Anticipated expiration: 1937-10-26

Description

C. W. KRATHWOHL AND J. F. COVENY.

LADDER.

APPLICATION FILED OCT. 4, 1919.

"1,357, 17 1, Patented Oct. 26, 1920.

' CharleaW/(mllzwohl L173): (bl any Gamma Application filed October 4, 1919.

To all Quiz-0m it may concern Be it known that we, CHARLns W. KRATH- worn. and JOHN F. CovnNY, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ladders, of which the following is a specification.

This invention relates to step ladders, and more particularly to the props by which the ladder is supported in upright position when in use. V

The invention has for its object to provide a novel and improved prop structure by which the ladder is securely held and effectually prevented from collapsing or sliding forward when in use.

The object stated is attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

In the drawing,

Figure 1 is a front elevation of the ladder unfolded and set up for use;

Fig. 2 is a side elevation thereof, and

Fig. 3 is a vertical section of the ladder showing the same folded.

Referring specifically to the drawing, 5

denotes the steps or rungs of the ladder which are rigidly fastened in any suitable manner between the usual side bars 6. The prop for the ladder is composed of legs 7 and '8, there being a pair of each: The two legs 7 are connected by diagonal and cross braces 9 and 10, respectively.

The legs 7 are pivoted to the side bars 6- near the top thereof, as shown at 11, where- Specification of Letters Patent.

Patented Oct. 26, 1920. Serial No. 328,398.

and meet at their lower ends as shown in Fig. 2, with the links 13 extending downwardly from the leg 8 toward the leg 7. The spread of the legs is now limited, and the ladder is prevented from being opened out too far.

At the top, the side bars 6 carry the usual pivoted shelf 14, which folds upward when the ladder is folded, and is so held by a spring catch 15 carried by the top rung or step of the ladder. When the ladder is unfolded and set up for use, the shelf is swung to extend horizontally and it is supported in this position by the top one of the cross braces 10.

l/Ve claim:

A ladder comprising side bars, rungs mounted between the side bars, a prop composed of legs pivotally connected at their upper ends to the side bars, the pivotal connection of one leg being below the pivotal connection of the other leg, and said legs converging toward and abutting at their lower ends when unfolded, and a pivoted link connecting the legs at their lower ends.

In testimony whereof we affix our signatures.

OHARLES W. KRATHWOHL. JOHN F. COVENY.-