US1474760A - Ladder - Google Patents

Description

Nov. 20, 1923.- 11,474,?

. F. J- BRYANT LADDER Original Filed July 1918 Patented Nov. 20, ldlZB. L

FREDEBIC J. BRYANT; OF NEXV YGRK, N. Y.

LADDER.

Original. application -fi1ed July 5, 1918, Serial No. 243,328. Patent-No. 1306.972, dated February 21, 1922. Divided and this application filed June 9, 1921. SerialN'o. 476,213.

T ocZZ whom it may concern: Fig. 3 is a detailview off a thimble rein Be-itknown that I, Fnnnnuro J. Bnraxrr. a forcement of a link forming part of the upcitizen. of the United States, and resident of per engaging means for aladder chain, and the borough of Manhattan, in the city, ig. 4: is a section on the line l-l of 55 5 county, and State of New York, have in- Fig. 1.

vented certain new and useful I'mprove- In the example of my invention presented ments lnLadders, of which the "following is herewith, 1t 18 shown as apphed to a ladder a specification. composed of the chain st1les 1, with wooden.

, This invention relates to ladders, the subrungs 2 (one of these rungs only appearing 60 ject matter of the present application, in the fragmentaryviewotFig.1),which enwhich is a division of my earlier applicagage attheir opposite ends with links of the tion, Serial No. 243,328, filed July 5, 1918, respective chains. The topmost rung 3, since matured into Patent No. 1,406,972, however, ispreferably composed of a metaldated February 21, 1922, being directed to lie tube, that it may possess ample strength 65 certain novel means employed in the conto, with certain adjunctive element-s, (herestruction of chainladders, whereby in case ina'fter described), lend itself to the antione stile or chain should break away from stripping feature of my conception. The its upper engaging-meanswhile the ladder is tube 3 is of sufliciently small diameter so carrying a load, the tendency which northat it will enter a chain link (see Fig. 4) 7 mally exists for the rungs to strip off the to effect union between the rung and ladder. other chain or stile is obviated, thereby pre- Upon the rung 3, at each end thereof, out venting a possibly serious accident such as side the chain, I place a disk 4:, whose diamwould result to a person using the ladder eter considerably exceeds that of rung 3, and when the stripping action occurs. eXt-eriorly of disk 4 I place a nut 5 upon the 7 5 Therefore my invention consists in the rung, whose end is exteriorly threaded for provision of a topmost rung "for the ladder, the purpose. The rung end, where it affords upon which rung, near the opposite ends a seat for the disk at and nut 5, may be rethereof, there are secured disks of relatively duced, to thereby provide an inner shoulder large diameter, disposed at the outer sides or bearing for said disk. Also, when the 80 of the respective chains, so that if one chain disk 4: and nut 5 have been fitted on the meshould break loose from its upper fastening tallic tube comprising the rung, the end oi means, causing the entire load to he suddenly said tube is upset, as at 6, to augment the imposed upon the other chain, the shock security aiforded by the nut against re and strain forces would not be exerted stripmoval of the disk. 85

pingly at the point of connection between The chain is localized in its position upon the chain and rung, but will instead be abrung 3, and held against lateral movement sorbed by the disk, while the strain exert thereon, by means of a spring clip 7, of ed bythe upper chain length will continue inverted U-shape, which tensionally grips to be directed in a line perpendicular to the the rung and is provided with an outer 9O rung axis. groove to form a saddle or seat for the side Other features and advantages of my inbars of a rung engaging chain link. vention will hereinafter appear. Each stile or chain engages by an end link In the drawing: 8 with a ring 9, that is to be suitably Figure 1 is an elevation showing a porsecured as by lashing 10 to a beam 11 or tion of a ladder, with upper fastening other form of upper anchorage. In the means, and with one fastening broken to construction of the chain ladder shown in illustrate the effect of the anti-stripping this application as the example wherewith means. my present invention is illustrated (which Fig. 2 is an enlarged, sectional detail, ladder in its more general constructive fea- 50 showing a rung with an anti-stripping disk tures is treated of in my said earlier and securing means therefor. application Serial No. 243328), my purpose has been to combine the qualities of light Weight, strength, and serviceability. The strength of the ladder is intended to be uniform throughout, without weak spots that might cause a rupture. In following out this scheme of uniform strength the link 8 is seated in a thimble 12 that is 01"? sub ficiently rigid character to prevent said link 8 from distortion which might lead to rupture.

It is only with respect to the means whereby the ladder is secured to its upper anchorage that liability of rupture exists, and, will be apparent from the foregoing disclosure, my invention is 7 especially devis'ed'ior the purpose of preventing the occurrence of possibly fatal accidents in the event oi the ladder breaking away from the anchorage fastenings for one 01" its stiles.

Variations Within the spirit and-scope of my invention are equally comprehended herein.

I claim r 1. A ladder including a pair of rungsupporting chains and rungs carried by links there-oi, characterized in that a metallic rung near the top of the ladderv has its ends engageably entered within opposite links of the chains, and is provided with bearing members respectively outside each chain, the diameterof said bearing members greatly exceeding the diameter of thereof, said members respectively forming localizing saddles tor-the side bars of chain links with which said rung engages.

3. The combination, in a laddercomposed of chain stiles with rungs engaging them,

of a top-most rung composed of metallic material, a grooved U-shaped saddle mem-' ber tensionally fitted upon each end portion" of the rung to seat and localize a rung engaging chain link, a bearing disk of much greater diameter than the .rung, fitted upon said rung against the outer side of each chain, a nut screwed upon the. rung end to engage the disk, and the rung end being upset to secure the engagement of the assembled elements.

Signed at the borotwhof Hanhattan, in

.the city, county, and tate of New York,

this 27th day of April, A. D. 1921. s

FREDERIC J. BRYANT.

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