US488428A

US488428A - Ladder

Info

Publication number: US488428A
Authority: US
Publication date: 1892-12-20
Anticipated expiration: 1909-12-20

Description

(No Model.)

J. H. PRYE su B. PITMAN.

LADDER.

Patented.Dec.20,1892.

Unrrnn drafts JOI-IN H. FRYE AND BENN PITMAN, OF CINCINNATI, OHIO.

LADDER.

SPECIFICATION forming part of Letters Patent No. 488,428, dated December 20, 1892.

Application tiled August 8,1892. Serial No. 442,488. (No model.)

l To all whom it may concern:

Be it knoWn that we, JOHN H. FRYE and BENN PITMAN, citizens of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Ladders, of which the following is a specification.

Our invention relates to an improved ladder.

The object of our invention is to provide a strong ladder which can be used Without danger for fire and other similar purposes Where long ladders are required and safety is an essential requisite for the utility of the device.

The features of our invention are fully set forth in the description of the accompanying drawings making a part of this specification, ip Which- Figure l is a plan view of our improvement partly in section. Fig. 2 is a section on line Qc, a', Fig. l. Fig. 3 is a section on line y, y, Fig. 2. Fig. fi is a modication of Fig. 2.

' Fig. 5 is a View similar to Fig. 3, showing a modification. Fig. 6 is a sectional detail on line o, fr, Fig. 5.

1, 1, represent flattened metallic plates preferably of channel iron formed as shown in Fig. 2.

2 represents Wooden stiles into which the metallic plates or strips are preferably countersunk. These flat or flattened metallic plates are rigid throughout their length and are applied to the outer sides of the stiles, so that said plates constitute rigid braces and are superior to simple Wires laid along the length of the stiles of a ladder as heretofore.

3 represents Wooden rungs mortised into the stiles 2.

4 represents bolts which at their end por` advantages are gained; first, the Wooden stiles and rungs are securely braced against collapsing, and are reallya Wooden lining to the metallic ladder, for the metallic strips and bolts form a skeleton ladder, so that if the Wood should rot or burn in any one section or rung, still the ladder is intact, or, if the Wood be cracked, split, or if there be a defect in any portion, the metallic portion possesses suflcient strength to support the strain imposed upon it. The stiles of ladders and the rungs, are very easily broken when they are unsupported; the Wood soon becomes impaired in strength, especially Where they are tenoned into the stiles, and readily break. But, by having a metallic ladder inclosed and braced by Wooden stiles and rungs, a very strong and durable device iscbtained, and the safety of the user is assured.

In the modification shown in Figs.. 5 and 6, the rung is supported by the metallic rod passing along the under side instead of through it, and the rungs are gained into the sides of the stiles.

Having described our invention what we claim is l. A ladder, consisting of the stiles 2, the fiat metallic plates 1 extending along the outer sides of the stiles and provided at intervals with bolt holes, the Wooden rungs 3, and the tie bolts 4 supporting the rungs and extending atv their opposite end portions through the bolt holes in the fiat metallic plates, substantially as described.

2. A ladder, consisting of the stiles 2, the flat metallic plates l extending along the outer sides of the Stiles and provided at intervals with bolt holes, the Wooden rungs 3, the tie bolts i supporting the rungs and extending at their opposite end portions through the bolt holes in the flat metallic plates, and the nuts applied to the bolts for securing the latter and tightening the parts, substantially as described.

In testimony whereof We have hereunto set our hands.

JOHN H. FRYE. BENN PI'IMAN.

Witnesses:

T. SIMMONS, C. W. MILEs.