USRE13914E - dunderdale - Google Patents

Description

H. DUNDERDALE.

LADDER.

APPLICATION FILED mun. 21'. 1915.

Reissued May 11, 1915.

llll I I N I l H. DUNDERDALE.

LADDER. 7 APPLICATION FILED [ML 21. I915.

Rei ssued May 11, 1915.

as ladder to both t UNITED STATES PATENT OFFICE.

HERBERT DUNDEBDALE, OF CLEVELAND, OHIO, ASSIGNOB. 'IO CHICAGO STANDARD EQUIPMENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

LADDER Specification of Reissued Letters Patent. Reissued May 11 1915 original so. 1,115,404, dated November 24,1914, Serial no. 884,903. Application for reissue filed larch a7, 1915. Serial m. 11,552.

To all whom it may concern Be it known that I, HERBERT DUNDERDALE, a citizen of the United States, now residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful. Improvements in Ladders, of which the following is a specification, refer-' ence be'ing had to the accompanying drawformin a part hereof.

y invention relates generally to ladders,

and

as reference more particularly to those employed in connection with railway freight cars. One of the objects of my invention is to so construct the stiles and treads of a ladder that they may be easily and quickly assembled in locked relation without the employment of any fasteninfg elements therebetween. Another object o my invention is to rovide a ladder which can be assembled an a plied to the car at a minimum cost.

A rther object of my invention is to produce a ladder which is simple, practical, and rigid .in construction; and a ladder capable of withstanding the hardest service usage, and wherein the rungs cannot turn in or become detached from their stiles.

These, together with such other objects as may hereinafter appear, or are incident to my invention, I obtain by means of a con- 80 struction illustrated in preferred form in the accompanying drawings, wherein Figures 1 and 2 are front and side elevations, respectively, of a portion of a car showing the a plication of my improved lie side and end of the car.

Figure 3 represents an enlarged detail view illustrating the means for attaching the ladder to the car.

Figure 4 is a front perspective of a pair of the treads prior to their assemblage in the stiles.

Figure 5 is an enlar ed horizontal section taken through the lad er; and Figure 6 is a partial rear elevation of the treads as as- 45, sembled Fi res 7 and 8 are views in perspective showing the method of assembling the ladder parts, and the parts as finally assembled in locked relation, respectively.

In carrying out my invention I the stiles 9 preferably composed o rovide angle irons,each having inner flanges 9' and outer car siding 13 by the strap sections 11 indicated more clearly in Figure 8; the bolts 12 removably connecting the ladder to the strap sections, as in the manner therein shown.

A series of vertically alined holes 14 formed at intervals in the inner flan 9' of the stiles to receive and provide a solid hearing for the series of rungs indicated at 10 in Figures 1 and 2. A reference to Figures 4, 5 and 6 will show that each of the rungs 10 comprises a tread portion 15 which is provided adjacent its ends with the angular offset portions 16- adapted to engage and rest in the holes 14 formed in the stiles, and

whose end portions 17 are bent in a vertical direction away from the said offset portions and slightly incline outwardly to engage the face of the lateral stile flanges 9 in a locking relation therewith. In this manner the rung 1 0 is positively locked against any turning movement whatsoever in the holes 14.

This statement of description refers generally to either of the two treads shown in Figure 4, the lower one of which 10, however, has preferably each of its inclined end portions 17 bent in a direction opposite to that of the corresponding bent portions 17 of the upper rung 10. When the rung 10' is I associate in the stiles with one or more of the rungs10to form the ladder, both stiles are consequently locked against relative vertical movement. Inother words at a time prior to its application to the car the ladder possesses that degree of rigidity which permits its ready application thereto, and once applied is absolutely rigid in all respects. In

practice the rung 10 may be alternately arranged with the-rungs 10 as indicated in Figure 8, or one or more of either of the rungs 10 or 10 may be assembled with a series of the other of the rungs in an arrangement as may be considered expe ient.

In order to apply the rungs to the stiles,

the bent end Iportions of the rungs 10 and 10 are passed -t rough the openings 14 in one of the stiles 9 toproject -beyond the outer flange 9", as in the manner shown in Figure 7, said pro ecting ends being turned'so as to have the other end portions terminally register with the openings 14 in the other of the stiles to pass therethrough. The projecting bent ends are then each given a quarter turn to occupy a. vertical position so that the other end portions which have passed through the holes 11 are correspondingly brought in place abutting against the outer flange 9 of the stile, whereupon the first mentioned stile is moved outwardly along the rungs and turned inwardly to the position shown in Figure 8, which illustrates a portion of the complete ladder.

While other commercial roller sections may be used instead of the angle irons shown, such as a channel iron which use is suggested in, Figure 3, I prefer to use the angle irons, for in the event of any desired replacement of a rung, one of the stiles may be quickly uncoupled from its end straps by removing top and bottombolts 12, which are conveniently placed for this reason, and then moved inwardly along the rungs toward the inner position indicated in Figure 7, so as to permit the removal of the rung and the replacement of another.

From the foregoing it will be obvious that the ladder may be easily and readily applied to the car, and is simple, economical and practical in its construction. Another important feature of my invention lies in the fact' that the rungs cannot turn in and cannot come detached from the stiles. Other advantages will be apparent to those skilled in the art.

I do not intend to restrict myself to the precise details of construction or to the exact arrangement of the parts as shown, as it is obvious that variations therefrom may be made without departing from the spirit and scope of my invention, as more particularly pointed out in the appended claims.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent, is the following 1. A ladder comprising stiles and a plurality of detachable rungs, each stile having divergent flanges. and formed with a hole in one of its flanges, said rungs having hole engaging portions and oppositely bent end portions each incliningoutwardly from said hole engaging portions substantially in a vertical direction to abut the other of the flanges at points respectively above and below the said holes, substantially as and for the purposes set forth.

2. A safety ladder comprising angle bar stiles and a plurality of rungs, each stile having inner and outer flanges and formed with a hole in its inner flange, and each rung comprising a tread having ofi'set bent end portions inclining outwardly from said offset portions substantially in a vertical direction to have an abutting locked relation with the inner face of the outer flange at points respectively above and below the medium line of the tread.

In a safety ladder, the combination of a pair of stiles and a plurality of rungs therefor, each of said stiles having inner I and outer divergent flanges and formed with ladder.

4. In a safety ladder, the combination of a pair of angle bar stiles each having holes formed in one of its divergent flanges and a pair of rungs having offset portions engaging in said holes, each rung having oppositely bent end portions extending angularly from said offset portions to engage the sides of the stiles, said end portions at one side of the ladder being bent inwardly toward each other and outwardly away from each other at the other side of the ladder to lock the rungs.

5. A ladder comprising stiles and a plurality of rungs, adjacent ends of said rungs at one sideof the ladder having ofi'set hole engaging portions and oppositely bent end portions inclining outwardly from said 011'- set portions, and one of the stiles having .divergent flanges and formed with vertically alined holes in one of its flanges through which the said offset and bent end portion are initially passed, the other flange of the stile being turnable inwardly on the offset portions to abut the said oppositely bent end portions to lock the rungs, substantially as described.

6. A car ladder comprising in combination a pair of stile members having a plurality of rung holes extending transversely therethrough; and a plurality of detachable rung members provided at each end with a bent hole-engaging portion and a rebent stile-engaging terminal portion of a size capable of being initially passed through a rung hole during assemblage of the said members; the terminal portion at one end of a rung being disposed to one side of the longitudinal'axis of the rung and theother terminal portion being disposed to the opposite side thereof; said. members being turnable to properly position the rung terminals when passed through the holes to bring the faces of the stiles in a plane; substantially parallel with the longitudinal axes of the rungs, whereby said terminal portions engage the said faces at points respectively above and below the longitudinal axes of the rungs to lock the rungs against rotative movement.

7. A car ladder comprising in combination a pair of stile members having a plurality of rung holes extending transversely therethrough; and a plurality of detachable rung members provided at each end with a bent hole engaging portion and a rebent stileengaging terminal portion, both portions being of a size capable of initial passage into a ung hole during assemblage of said members; the terminal portion at one end of a rung being dis osed to one side of the longitudinal axis 0 the rung and the other. terminal rtion being dis osed to the opposite side t ereof; said lad er members being relatively turnable to properly posi- HERBERT DUNDERDALE.

Witnesses:

P. W. Rn'rn, L. J. BU'rrNnR.

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