US162856A - Improvement in firemen s extension-ladders - Google Patents

Description

'2 Sheets--Sheet 1;

'P. PETE'RSON.

Fir'men's Extension-Ladder.-

N0.162,856. V Patented May 4,1875.

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2 Sheets--Sh eet 2.

P. PETRSUN.

Firemen's Extension-Ladder. Nd 52,856, Patented May 4,1375.

THE GRAPHIC CO.FHOT0'L|TH.39 8:41 PARK PLACLNJ'.

PETER PETERSON, OF NEWV MILFORD, CONNECTIGUT.

IMPROVEMENT lN FIREMEN'S EXTENSION-LADDERS.

Specificat'on forming part of Letters Patent No. 162856, dated May 4, 1875; application filed April 7, 1874.

To all whom it may concer'':

Be it known that I, PETER PETERSON, of New Milford, in the county of Litchfield and State of Oonnecticut, have invented certain lmprovements in Fire-Escapes, of which the 'following is a specification:

braces, slotted standards, and weighted slides,

whereby the angle from the Vertical of the system of ladders may be varied without injury to the stability of the same, and the ladder-sections kept in suitable relation with the elevating devices.

Figure lis a side elevation of'an apparatus constructed according to my invention, with the system of ladders elevated or extended as when -in use. Fig. 2 is a rear elevation of the same in the same position; and Fig. 3 is a side elevation, on a larger scale, with the system oi' ladders lowered to the position required while the apparatus is being transferred from place to place, as desirable when not in use.

A is a bed-plate, provided with standards B, slotted as shown at a in Figs. 1 and 3. In each of the slots slides a weight or loaded slide, G, a rod, b, extending across from one weight to the other, as shown in Fig. 2, and to this rod is pivoted or attached the upper end of a ladder-section, D. The lower end of this Ladder-section D is connected by togglebraces E with the bed-plateA in such manner that, with the said. braces in one position, as in Fig. 1, the ladder-section will be n'early Vertical, while, when the brace is in another position, as shown in Fig. 3, the said section will be much nearer horizontal. Upon the rear side of the ladder-section D is another, F, connected therewith by clasps or guides c,

which permit a longitudinal movement of the section F upon the section D, and in like manner the sections F Gr are provided with clasps or guides, the number of ladder-sections thus connected being greater or less, as may be preferred. Working in bearings fixed upon the standards, or upon the bed-plate, as desired, is a shaft, H, carrying at each end two notched, cogged, or spurred wheels, I. These wheels are preferably shaped after the manner ot' ratchet-wheels, as represented in Figs. 1 and 3, the teeth a' thereot' gearing into the rounds d of the ladder-sections, and studs e placed intermediately with the said rounds in such a way that, when turned in the proper direction, the said wheels will lift longtudinally each laddcr-section as it comes adjacent. For example, first acting on the section G, it elevates the same until its clasps or guides c press nward and catch upon certain springcatchesf, provided in the sides of the other ladder-sectiou F, upon which it moves, the moving section G being thus fixed upon the end of the other section F, and extendng above the same. This done, the second or next adjacent ladder-section F falls into gear with the lifting-wheels 1, this being permitted by the movement allowed to the lower end of the ladder-section D by the toggle-braces, and that permitted to the upper end of said section by the movement of the slide C in the slots a and, by the continued rotation of the said lifting-wheels, the section is elevated 1n the same way as the section G until, in the sane manner as with the latter, its clasps or guides c pass over and catch upon other spring-catches f, which attach it fiedly to and extending upward from the top of the section D. It will thus be seen that the connected ladder-sections constitute together a telescopic ladder, elevated or elongated for use by the action of the lifting-whee1s, and with its sections held in their elevated positions by the fixed resistance of the springcatches f. As thus elevated, in the immediate neighborhood of a burning building, the ladder will aiit'ord access to the windows thereof or a means of escape therefrom. 'From each of the spring-catches f, passing inward to the one opposite, is a cord, g, extended at its center to the ground. By pulling this cord the spring-catches are drawn inward, and, thereby releasing each pair of catches, the laddersection above enables the same to be brought downward, when desired, a reverse movement of the lifting-wheels during this descent of the ladder-sections being, of course, permitted. The movement of the lifting-wheels is obtained from that of a spur-wheel, m, gearing into a pinion, n, on the shaft H of the liftin g-wheels but loose upon this shaft, between the lifting-wheels, is a drum, K, upon one end ot' which is provided a pinion, r, having the same diameter and pitoh of teeth as the pinion n, so tha-t the shaft r' ot' the spur-wheel m, being moved longitudinally, the spur-wheel m may be brought out of gear with the pinion n and into gear with the pinion 7' to actuate the drum K. `Wheu the spur-wheel is thus disconneoted from the pinion n the sha-ft His kept from turning backward by a pawl, a", working against a ratchet-wheel, b", on the said shaft. Of course th s pawl is thrown out of gear when the laddr-sections are brought down, as hereintofore set forth. A

rope, N, extends from the drum K up over a pulley, u, on the top of the ladder-section G, and, thence depending, has a car or platform, M, at its extremity, the shaft r being provided with a crank, r", or other suitable means, whereby it may be rotated. The drum is readily actuated to raise or lower the car in providing for the escape ot' persons or the removal of goods, 850., from the upper windows or stories of buildings. When the laddersections are lowered, as hereiu previously described, and as indioated in Fig. 3, the apparatus may be placed upon any suitable vehicle for transport from place to place.

What I claim as my iuvention is- 'l`he eombination of the toggle-braces, slotted standards, and weighted slides with the telescopic ladders, Operating as set forth, the whole arranged as and for the purpose specified.

PETER PETERSON. Witnesses:

SHERMAN T. ADDIs, J oHN S. TURRILL.

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