US983213A - Ladder. - Google Patents

Description

E. F. DAHILL & G. R. BARTLETT.

LADDER.

APPLICATION FILED JULY 20, 1910.

Patented Jan. 31, 1911.

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onian STATES PATEIQT @FFT@,

EDWARD F. DAT-TILL, OF NEW BEDFORD, AND GAD B. BARTLETT, OF PLYMOUTH, MASSACHUSETTS.

LADDER.

Specification of Letters Patent.

Application filed July 20, 1910.

Patented Jan. 31, 1911.

Serial No. 572,902.

To all whom itmay concern:

Be it known that We, EDWARD F. DAI-IILL and GAD R. BARTLETT, citizens of the United States, and residents of New Bedford, Bristol county, l\4[assachusetts, and Plymouth, Plymouth county, Massachusetts, respectively, have invented certain new and useful Improvements in Ladders, of which the following is a specification.

This invention relates to ladders and has particular reference to ladders which are adapted and intended for use in places eX- posed to the weather. Our ladder is especially adapted for use in fire fighting apparatus and it has been our purpose to so construct it as to make a strong, neat and light device and at the same time one on which ice will not form or collect.

The novel features of the invention will be apparent from the following description taken in connection with the accompanying drawing.

In the drawing, Figure 1 is aside view partly in section showing a portion of a ladder embodying our invention; and Fig. 2 is a cross section on the line 22 of Fig. 1.

The side rails or bars of our ladder are made up of wooden strips 1 and 2 between which we place the steel plate 3 which is preferably as wide as the wooden bars. The rungs 4 are in the form of steel tubes, the ends of which enter openings 5, 6, in the steel plates and the parts are secured together by expanding the ends of the tubes within the openings, as shown in the drawing. This construction gives the requisite strength to the ladder and at the same time the parts are made sufficiently thin to prevent the ladder as a whole from having any great weight.

Ladders, such as are used in fire fighting apparatus, are often exposed to rain and to the falling water discharged from the apparatus and in cold weather this water freezes on the ladder and makes it ditlicult for the firemen to climb it. We have found that this adhesion of ice may be avoided by covering the rungs of the ladder with a sheathing 7 of pure aluminum, since the aluminum OXlCl formed at the surface of the metal has a greasy efiect which prevents the adhesion of ice. We also preferably cover the side bars or rails with a sheathing 8 of pure aluminum for the same purpose. This sheathing not only gives to the ladder as a whole a neat appearance but serves to prevent the adhesion of ice as above described as well as to protect the main parts of the ladder from the weather.

Having described our invention what we claim and desire to secure by Letters-Patent is,

1. A ladder having its parts covered with a thin sheathing of aluminum.

2. In a ladder, the combination with side rails, of rungs secured thereto and aluminum sheathing for said rungs.

3. In a ladder, the combination with wooden side rails having steel plates embedded therein, of tubular steel rungs secured to said steel plates, and aluminum sheathing for said rungs.

at. In a ladder, the combination with wooden side rails having steel plates em bedded therein, of tubular steel rungs secured to said steel plates, aluminum sheath ing for said rungs, and aluminum sheathing for said side rails.

5. In a ladder, the combination with side rails composed of steel plates provided with openings and having wood sections secured thereto on each side, of tubular steel rungs entering said side rails and having their ends expanded in said openings in the side plates to secure the parts together.

In testimony whereof we aflix our signa tures in presence of two wltnesses.

EDWARD F. DAT-TILL. (cl-AD R. UNRTLFJTT.

Witnesses as to the signature of Edward F. Dahill:

FRANK L. ROGERS, THOMAS A. SYLVIA. Witnesses as to the signature of Gad R. Bartlett:

'TTENRY W. BARNES, Vromrr T. FOSTER.

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