Improvement in ladders
US 159627 A
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Description (OCR text may contain errors)
NITED STATES PATENT EEICE,
DANIEL ARGERBRIGHT, OF TROY, OHIO.
IMPROVEMENT IN LADDERS.
Specification forming part of Letters Patent No. 159,627, dated February 9, 1875; application filed August 12, 1874.
To all whom it may concern: p
Beit known that I, DANIEL ARGERBRIGHT, of Troy, Miami county, Ohio, have invented a new and useful Improvement in Ladders, of
which the following is a speciiication:
My invention has for its principal object a more secure and permanent connectionpbetween the steps and the sides of a ladder, while serving at the same time to brace and stilen the parts attached. These objects I accomplish by means of a series of metallic j sheaths or clips and tie-rods, as hereinafter O represent the rods, and D D the stretchers of the back prop.
The principal feature of my invention is the means by which I both connect and strengthen the steps and side pieces, and which I now proceed to describe.
Each step, except the top one, is grooved at b on its under side, to receive a wire rod, E, which, passing through the stiles, receives a nut, F, the end of the wire being properly scrcw-threaded for that purpose. Both ends ot' each of said steps have a metallic casing, G, from which projects a clip or sheath, H, adapted to embrace the inner side of the stile in the manner shown. H is a similar clip for the outside lof the stile, as represented. Both clips and casing are suitably perforated to.
permit the passage of the wire-rod E.
The advantages of this mode of construction are obvious. For example, instead ofthe large mortises for the wooden step-tenons, which always either seriously weaken the style or necessitate unwieldly thickness, there is only required a small hole for the wire tierod E, and even this slight diminution is much more than compensated for by the bracing action of the clips. The casings Gr, also, at the same time operate to strengthen and brace the steps, and even should either of the latter be broken, it could be quickly replaced by a new one, by merely unscrewing of the wire rod, without disturbing anyotherpart of the ladder.
The top step is attachedv by means of ferrules I I', which engage over the tops ot' the Stiles, and have perforated lugs i, through` which wood-screws J pass into the under side of the step. Projecting from these ferrules are ears K, to which are hinged other cars, L, of i'errules M, which en gage over the tops ofthe rear props. Lugs k on the ears K, engaging lugs l on ears L, prevent the props slipping out too far, and thus remove a cause of frequent accidents. The stretchers D ot' the props have ferrules P, whose clips Q enwrap the inner sides, while similar clips, R, enwrap the outer sides of the props, and a wire ro'd, E', passing through all these parts, and taking nuts F', operates to iirmly connect the parts together, and to brace and stiien the saine.
The rounds of a long ladder will be secured in a similar way. (See Fig. 4.)
Whiledescribing the preferred form of my invention I reserve the right to vary the same in non-essential particulars-for example, the wire tie-rods may have their ends secured by riveting either in conjunction with or substi* tution of the nuts, or they may have a nut on one end merely, and a head on the other.
I claim as new and ot' my invention- In a ladder, the combination of the stiles A A', steps Bl B2 B3, clip-casings Gr H, outside clips H', and tie-rod E, all constructed and arranged as herein set forth, for the purpose specified.
`In testimony of which invention I hereunto set my hand.
DANIEL ARGERBRIGl-IT. Attest:
f GEo. H. KNIGHT,