US527942A - Extension fire-ladder and truck - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1. A. B. OAIRNES.

EXTENSION FIRE LADDER AND TRUCK. No. 527,942. Patented Oct. 23,1894.

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(N Model.) .3 Sheets-'Sheet 2 A. B. CAIRNBS. EXTENSION FIRE-LADDER AND TRUGK.

No. 527,942. Patented Oct. 23,1894. 1

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(No Model.) 3 Sheets-Sheet 3,

A. B. CAIRNES. EXTENSION FIRE LADDER AND TRUCK. 'NO.5Z7,942. N Patented 00h. 23,1894n Uni'ino STATES Barnum Quince,-

ALEXANDER B. OAIRNES, OF SAN DIEGO, CALIFORNIA.

EXTENSION FIRE-LADDER AND TRUCK.

SEECIZEICA'LION forming part of Letters Patent No. 527,942, dated October 23, 1894.

Application filed February 27,1894. Serial No. 501,665. (No model.)

To all whom it may concern.-

Be it known that I, ALEXANDER B. CAIRNES, a citizen of the United States, residing at San Diego, county of San Diego, State of California, have invented an Improvement in Extension Fire-Ladders and Trucks; and I hereby declare the following to be a full, clear, and

exact description of the same.

My invention relates to improvements in extension ladders and the trucks upon which.

they are conveyed, such as are usually employed by fire departmentmand it consists in certain details of construction which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a horizontal plan view showing the ladders closed. Fig. 2 is a side elevation of the same with the ladders shown partially raised in dotted lines.

e any desired angle between the horizontal and perpendicular, and which may be extended to any distance practicable for the number and length of ladders connected together, a truck upon which said ladders are mounted, with a mechanism whereby they are raised and extended, and an attachment for carrying a quantity of hose in addition to the extra ladders, without raising the frame of the vehicle so high as to make it top heavy.

A is the frame of my apparatus, made of sufficient length to properly support the ladders B, O and D, which are carried and operated'thereon. This frame is mounted upon wheels E, the front wheels swiveling under the frame so that they may be turned to a position at right angles or more, for the purpose of turning the truck and backing it up to the curb or other point where it is desired,

and moving it in the least possible space for its length.

The lower part of the frame A serves-to carry the extra ladders which are usually pushed in from the rear and lie between the top and bottom parts of the frame. Below this is a platform F which extends between the rear and front axles at a suitable height quantity of loose hose which is piled in upon theplatform', so that it may be used by the crew of the apparatus by connecting with a hydrant in case they arrive beforetheengines or other parts of the fire apparatus, as is frequently the case. Upon each side of this platform are foot-boards Gupon which the men connected with the apparatus can stand, holdingthemselves in place by side rails H. I'make these side rails of hollow tubes, and the brake rods I extend through these tubes from the brake-leversj at the rear, to thelevers K which are fnlcrumed upon each side of the frontpart of the frame, the cross-bar and just below the seat is a foot-yoke L fulcrumed upon the foot-board as shown and connected by links M with the cross-bar ofthe levers K. By this connection the device for operating the brake lever is brought directly in front of the driver, and when he presses upon the foot-lever L and forces it toward the front, the brakes are applied. This lever L is so fulcrumed that as it is pushed down upon the links Mcoming morenea-rly in line with the lever arms themselves.

By extending the brake lever rods through the side hand rails H, they are entirely out ient connection for the brakes, without interfering with the men'who rise on each side.

Along the inside of the top rail of the frame rack N. These are adapted to be engaged by pinions 0 upon the shaft P. This shaft extends through the lower ends of the metal sockets Q which are forked at their upper ends ladder, forming extensions therefor, and having holes made through them transversely through which the shaft P turns as described.

In order to retain the lower ends ofthe ladder in place and the pinions in engagement with the racksglhave shown L-shaped blocks from the ground and which serves to carryawhich unites them extending above the frame,

of the way, and enable me to make a conven- A, on each side, is secured astraight toothed the foot-board, the leverage becomes greater after the manner of a knee lever, by reason of and strongly bolted to the foot of the lower IOO R, through the upper ends of which the shaft P turns loosely. The lower ends of these blocks have anti-friction rollers S pivoted to llO them and extending beneath the rack bars, so that while the pinions O engage the teeth on the upper sides of the rack bars, these rollers travel upon the lower sides and thus prevent the lower ends of the ladder, the shaft P, and the pinions from lifting, by reason of any weight that may extend beyond the fulcrum point about which the ladders are raised.

T T are fulcrum rods, the lower ends of which are fulcrumed upon a shaft U at the rear end of the frame A. The opposite ends of the rods T are fulcrumed upon the sides of the lower ladder as shown. Upon this shaft U are fixed the pinions V, and also the levers W which are jointed at X so that they may fold upon themselves. The outer ends of the outer portion of the levers are united by a cross bar Y.

Beneath the shaft U is another shaft Z carrying pinions a. which engage the pinions V. This lower shaft extends out upon either side beyond the frame and has an appliance by which to turn it which, in the present case, is in the form of a wheel with arms or spokes, and a short tubular shaft which may be slipped upon the end of the shaft Z so as to engage a pin thereon when it is necessary to turn the shaft, and which may be removed when the apparatus is not being operated. By turning this wheel and the shaft, the pinionsV and the shaft U may be turned, and the jointed lever arms thus raised and extended. These lever arms lie beneath the outer ends of the ladder, when the ladders are lying horizontally upon the truck, and as the fulcrum rods T are also in a horizontal position in line with the ladders at that time, it will be manifest that the ladders can not be raised by the rack and pinion mechanism, until they have first been elevated by other means so that the fulcrum levers and the ladder to which they are connected form an angle with each other. The ladders are thus raised to form this angle by means of the jointed lever arms W and the pinion mechanism just described, which acts to raise and extend the levers and with them raise the outer ends of the ladders sufficiently to enable theother part of the mechanism to act upon them. Springs 1) are fixed to support the lower joint of these jointed arms and they may be made of sufficient strength to materially assist in raising the outer ends of the ladders when the shafts and pinions are turned for that purpose, and to ease the ladders-down.

When the ladders are being let down, the

- rear ends of the socket pieces Q come into conthe lower ends of the ladders to ease them down, and to keep the joints close while they are being let down.

When the ladders have been raised by the jointed lever at the rear so that they stand at a slight obtuse angle with the fulcrum rods T, a wheel or other device is applied to the end of the shaft P, and this shaft is rotated so as to cause the pinions O to travel along the rack bar N.

The ladders are prevented from returning along the rack bar by pawls d which are fulcrumed upon the shaft 1? and drop into the teeth of the rack as the foot of the ladder moves toward the rear of the truck.

As the foot of the ladder moves toward the rear, the outer end is correspondingly raised by reason of the fulcrum rods Tabout which it is turned, and as the base of the ladder approaches thebase of the fulcrum rods, the angle between the two is constantly raised and rendered more acute until the ladder is in any desired position.

If it is necessary to enter the first or second story window of a building the truck is backed up to the curb, the ladder is raised until the proper angle is reached and the upper ladders are then extended as will be hereinafter described, until they reach the window or desired point, and the same result is accomplished for any floors above which are within reach of the full length of theladder by raising the ladders to a greater angle and then extending the upper parts until they reach the.

desired point. This construction also allows the ladders to be raised inside the line of the telegraph wires, which are usually extended above the edge of the sidewalk. By reason of this construction, the ladders are very firmly supported, having the whole length of the truck body to resist the weight and strain upon them, and the apparatus is very steady because the ladders are raised and lowered in a plane lengthwise of the truck. In addition to this I employ guy ropes e which are preferably made of steel wire rope, the upper ends being attached at the top of the lower ladder and the opposite ends are coiled upon drums f journaled near the front end of the truck frame. These drums contain coil springs which yield while theladder-is being raised and allowthe ropes to uncoil and accommodate themselves to any position of the ladder. Pawls g are adapted to engage the teeth of the ratchets which are connected with the drums, and retain them at the proper point so that when the ladder has been raised to a nearly perpendicular position, and its foot is very near to the bottom of the fulcrum rods T, these guy ropes serve to support and steady the ladder and relieve the narrow base of the strain which would otherwise be brought upon it.

The ladder section 0 slides upon the section B, moving in guides h which are fixed upon the ladder, and curve over the upper edges of the ladder C. The ladder D in the ICC same manner slides within the side rails of the ladder C and is similarly guided. it

The lower ladder has a shaft 11 extending through the upper part of the socket piece of the ladder C, with an interposed tension,

equalizing spring, and extends thence down around the sprocket wheel is, thence up behind the ladders, and over a sprocket wheell upon a shaft which extends across the upper end of the ladder Band thence down between the rounds of the ladder B and those of the ladder 0, being attached to one of the lower rounds of the ladder (3. Upon the ends of the shaft which carries the sprocket wheel Z are loose rollers m upon which the sides of the laddcrO travel and which relieve the friction as it is caused to slide upward upon the lad- 1 der B. When the shaft carrying the sprocket wheel his turned up by a wheel or crank upon the outer end, it acts upon the chain and raises the ladder O, causing it to slide along the ladder B. At the same time the ladderD is caused to slide uponthe ladder O in the same manner by steel wires, ropes or chains 42, one end of which is connected with the ladder D near its lower end; This rope or chain passes over a pulley n which is journaled at the upperend of the ladder C. It passes thence down and connects with the upper round of the ladder B, so that as the ladpawl.

der 0 slides upon a ladder B and increases the distance of the pulley n from its upper end, the pulley pulls upon that part of the wire rope which is attached to the ladder D, and thus lifts the latter simultaneously with the upward movement of the ladder O. The ladder D travels over anti-friction rollers 0 which are journaled upon the shaft at the upper end of the ladder C. it

In order to prevent accident by reason of any breakage of the lifting chains or ropes which would allow the ladders to slip down by gravitation, I have shownpawls fulcrumed upon the sides of the ladders and normally kept in a position which prevents them from engaging by springs q. When the ladders are being elevated, the pawls are turned so that these springs act in such a manner as to hold the points of the pawls in line with the rounds of the ladder next below. The backs of the pawls rest against stop pins tfixed in the sides of the ladders "so that if a ladder should be let down, the end of the pawl would rest upon the round of the ladder below and that would arrest it at that point, the stop pins being strong enough to resist the pressure upon the back of the When the ladder is to be depressed, these pawls are first turned parallel with the sides of the ladder and out of line of the rounds of 'the next ladder, and this allows theladders to be depressed by turning the shaft and sprocket wheel is in the opposite direction from that which raises the-ladders.

This shaft is retained in'position while the ladders are being raisedby pawls rwhich engage ratchet wheels fixed upon the shaft '5, and when the ladders are to be depressed these pawls are turned back out of engagement so as to allowthe shaft and sprocket wheel to be turned backward, the ladders to move down until the ladders are all closed up. The ladders are then let down to lie upon the truck by turning the holding pawls d of their pinions 0 back, and allowing the pinions to be rotated backward along the rack bars N when the ladders will gradually approach the horizontal position, the guy ropes being wound up by the spring-actuated drumsfso as not to become foul, and as the ladders approach the position near where they will rest upon the jointed arms at the rear, the pinion shaft P comes in contact with thesprings c which are thus compressed and assist to let the ladders down more gently until they rest upon the upper bar of the jointed levers W. The ladders are then let down the remainder of the distance by turnso as to fold the lovers downand allow the ladders to come to their support upon the top of the truck frame, the springs b at the rearreceiving the levers as they fold down, and assisting to ease the ladders down. By this construction 1 am enabled to make the truck very low while allowing sufficient room for extra ladders and a large quantity of hose, and the mechanism by which the ladders are raised and extended is so low upon the frame, that the apparatus does not becometop heavy and in danger of upsetting as is the case with many devices of this sort on account of the high position of the mechanism by which they are operated. It also enables me to construct it much lighter and make it easier to handle;

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Aframe mounted upon wheels having rack bars extending longitudinally upon the top, a ladder having pinions journaled at its foot adapted to engage the rack bar,a means for rotating the pinions to cause them to ad- Vance along the rack bar, fulcrum rods connected at one end to the ladder at a point intermediate between the pinions and the opposite end, and having the other ends connected with the rear end of the frame wherei ions fixed thereon engaging the rack bars,

a means for rotating the shaft so that the pinions advance along the rack bars, fulcrum rods connected with the frame at the rear end and having their opposite ends connected with the sides of the ladder, whereby the outer end of the ladder is raised by the.

movement of the lower end toward the rear of the frame, pawl-s adapted to engage the rack whereby the foot of the ladderispre,

vented from returning as described.

3. In an extension fire ladder, a frame mounted "upon wheels having toothed rack bars extending along the sides at the top, a ladder having a shaft extending across its foot with pinionsfixed upon theshaft adapted to travel upon the rack bars, fulcrum rods; having their rearends attached to the rear: of the frame and their opposite ends con 'nected with the sides of the ladder, whereby the outer end of the latter is raised as the foot is caused to approach the rear of the frame, pawls engaging the rack .bar to prevent the retu rn-Jof the foot of the ladder, and anti-frictionallocking blocks connectedkwith the pinion shaft and-extendingbeneath the rack bars, whereby the pi-nions are held in mesh with the rack bars, and the lowerend of theladderprevented from being lifted by 5 the weight-outside of its fulcrum points as herein "described.

4.1n an extension fire ladder, a frame mounted upon-wheels having rack bars extending along its sides, a ladder having a shaftextendingacross its lower-end with'pinions :adapted to 'engageand travel upon the rack bars, andja means for rotatingsaid' pinionsxand' retaining the foot of the ladder at any pointin its advance, fulcrum rods having'oneend connected with the rear of the frame,-and-the-other end-with the sides of the ladder whereby the ladder is raised to any.

desired angle by causing its foot toapproach the rear of the supporting frame, a ladder slidable in .guides upon the main ladder, sprocket wheels mounted upon shafts at opposite ends of the main ladder, a chain .pass- 7 ing around said sprocket wheels and having its ends connected with the second ladder whereby the latter is caused to advance within its guides upon the first ladder, sub-- stantially as described.

5. 'In "an extension fire ladder, a frame; mounted upon wheels having rack bars ex-;

tending along its sides, a ladder having :a shaft extending across itslower end withlpinslidable in guides upon the main ladder,

sprocket Wheels mounted upon shaft-s at op- .plosite ends of the main-ladden'a chain pass- ;ing around said sprocket wheels andhaving its ends connected with the second ladder whereby the latter is caused to advancewithin its guides upon the first laddenasecond rope or chain passing around apulley' turning upon the shaft at the upper end of the second ladder, said rope having one of its ends attached to the top of .the first ladder and the other end to the bottom of the third ladder whereby the latter i-scaused to advance between its guides-upon the second ladder while the second ladder is advancing upon the first, substantially as described.

-6. In an extension fire ladder, a frame mounted upon wheels and having toothed rack bars extending along its sides, a ladder having its lower end guided to move parallel with, and pi nions adapted toengage therack bars whereby the rotationofthe pinions will advance the foot of the ladder toward the rear, fulcrum rods having the lower ends attached-at the rear of the frame, and the 0p- -posite ends pivoted to the sides of the ladder,

so that the advancing of .thefootof the ladder toward the rear will raise theouter end,

another ladder slidable in guides upon the first ladder .and sprocket wheels and chain whereby it is moved and stop .pawls f ulcrumed'tothe foot of each movable ladder projecting so as to-engage the rounds of the der having a pinion 'shaftextendingthrough its foot, and pinions secured thereto adapted to travelalong the rack bar and fulcrum rods having the lower ends connected with the rear end-of the .frameandthe opposite ends pivoted to the sides ofthe ladder, a mechanis-m for partially raising the outer end of the ladder from a-horizontal position so that the fulcrum lovers are .brought into position to act, consisting-of jointedlevers hinged to the rear of the frame, shafts having pinions and a mechanism whereby they are rotated and .the leversextended soas to raise the outer endsof the ladder above the horizontal position as herein described.

8. ,An extension fire ,ladderconsisting of a framemountedupon wheelshavingrack bars extendingalong the upperpart a ladder-and fulcrum rods connected as shown, a pinion shaft and pinions whereby the foot of the ladder is advanced .along the rack bar in eitherdirection, and the springs 0 against which the lowerend of the ladder is received as it is-being'let down forthe purpose'o'f re- .lieving the strain as it drops into the horizontalposition as herein-described.

9. An extension fireladder consisting of a portablerframesupport, having rack bars extending along the upper part a ladder and fulcrum rods connected as shown, a pinion through which the rods pass, fixed along the upper sides of the frame above the foot boards as described.

In witness whereof I have hereunto set my hand.

ALEXANDER B. OAIRNES.

Witnesses:

S. H. NOURSE, H. P. ASOHEOK.

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