US275816A - David fkiedheim - Google Patents

Description

(No Model.)

D. FRIEDHEIM. FIRE ESCAPE.

Patented Apr. 17, 1883.

FLLfZ INVENTEIR l-TNESSES: M?

UNITED STATES PATENT QFFICE.

DAVID FRIEDHEIM, OF NEW YORK, N. Y.

FIRE-ESCAPE.

SPECIFICATION forming part of Letters Patent No. 275,816, dated April 17, 1883.

Application filed January 23, 1883.

To all whom it may concern Be it known that I, DAVID FRIEDHEIM, of the city of New York, county and State of New York, have inventedanew and Improved Fire-Ladder, of which the following specification is a full, clear, and exact description.

This invention relates to an improvement in that class of fire-ladders which are constructed on the lazy-tongs principle, such as shown in my Patent No. 261,843, granted to me August 1, 1882. The present invention has reference more particularly to the mechanism for supporting the ladders in their upright position when the apparatus is raised. I

The invention consists in the combination of a set of mounted lazy-tongs with revolving central rungs, and with rods rigidly secured at their upper ends to one of the said central rungs, and adapted to rest with their lower ends upon theother of said centralrungs;also, in the details of improvement hereinafter more fully pointed out.

In the accompanying drawings, Figure 1 is a perspective view of myimproved fire-ladder. Fig. 2 is a detail side elevation of part of the supporting-frame.

Similar letters of reference indicate corresponding parts in both figures.

The letter A represents the truck for supporting the apparatus.

a a b I) c c are the members of three (more or less) pairs of lazy-tongs, each pair being composed of one ladder, a b o, and of a frame, a b c, embracing said ladder. The several ladders form a continuous series, as shown, and may be raised and lowered by drums and ropes on the truck, or in similar manner.

a b c are the central rungs of the three ladders. These rungs serve as pivots for con necting theirladders to their respective frames. The rungs a b 0 pass loosely through the sides of the ladders and frames, so that they can turn, and are provided with heads at their ends. To the ends of the lowermost of these pivots, a are fastened rods 61 d, which serve as braces for preventing lateral motion of the ladders. To the next central rung, W, are rigidly attached two (more or less) downwardlyprojecting rods, 6, the lower ends of which rest upon the upper bearing-surface of the rung a (No model.)

as shown, when the apparatus is raised. A similar pair of rods, 6 e, is rigidly secured to the rung c and is supported by the rung b and this construction is multiplied for every additional ladder that may be used. Now,

when the apparatus is raised by means of the drums the rods eewill,by their own gravity, gradually assume a vertical position, resting finally with their ends upon the central rung below, and thus locking the entire apparatus, as shown in the drawings. When the apparatus is to be lowered the rung a is partially revolved (to the right) by swinging the rods d. This will cause the lower ends of the rods 0 e to be swung slightly aside, and by this means the rung b is partially revolved, to the left. The turning of this latter rung will set the ends of the rods 0 6 free, causing revolution of rung c to the right, and in this way the entire system of supporting-rods may be unlocked, and the apparatus, being left unsupported, will now be lowered.

ff are small plates attached tot-he several central rungs opposite the ends of the rods 0 e, and serve to prevent automatic displacement of said rods; but other means may be devised for this purpose.

g g are foot-boards pivoted to the rods 6 e, or to other parts of the fire-ladder. These foot-boards have their free end provided with a corrugated lower edge, h, as shown, which, when placed upon a window-frame, will press into the same, and serve to more intimately Y attach the ladder to the building before which it is mounted.

I claim as my invention- 1. The combination of the mounted lazytongs a a I) I) with the revolving rungs a D and with the rods 6, rigidly secured at their upper ends to the rung b and adapted to rest with their lowerends upon the rung a, substantially as hereinbefore specified.

2. The combination of the mounted lazytongs a a b b with the revolving rungs a b, platesf, rods 0, and braces 61, substantially as and for the purpose specified.

DAVID FRIEDHEIM.

Witnesses:

F. V. BRIESEN, J 0s. J. McGINLEY.

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