US1473228A - Ladder - Google Patents

Description

Patented iblov 5, i923.

srares JDSEF GRNDEL, OF NEW YORK, El'. Y.

epiincation fu@ August s, i922. sensi no. ares-ai.

'/'o nl] 'ir/mm it may concevoir.'

lle it known that l. Josue- GnNnrL, a citizen oi (lei-many. and resident of the city of New York. in the county of New York and State of New York. have invented Certain new and useful improvements in Ladders, oi which the t'ollowinpy is a specification.

The present invention relates to ladders and more particularly ot the class known as knockdown ladders.

The main object of the invention is to provide a ladder, the runes and Stiles of which may be conveniently separated and the ladder taken apart and readily reassembled without the use ot additional fastening means, each stile being made of a. plurality of separable sect-ions none ot which extends ay greater distance than from one rung to another.

Another objectI ot the invention is to provide a ladder or the type mentioned which is simple in construction, efiicient in operation, durable in use and capable ot manufacture on a'commercial scale, or in other words one which is not so ditlicult to make as to be beyond the reasonable cost of such a contrivance.

With these and other objects in view, which will more fully appear as the nature of the rinvention is better understood, the same consists in the combination, arrangement. and construction of parts hereinafter described, pointed, out in the appended claim and villustrated in the accompanying drawings, it being1 understood that many changes may be made in the size and proportion of the several parts and details of constructionwithin the scope of the appended claim` without departing from the spirit or sacrificing any of the advantages of the invention.

Une of the many possible embodiments of the invention is illustrated in the accompartyingl drawings. in which v Figure 1 is aV side elevation of two seetions of one stile of a ladder, constructed in accordance with the present invention; Fig'. 2 is a front elevation thereof; and Fig'. 3 is a section taken o-n line 3-3 of Fig. 1.

Each or' the Stiles of the ladder is composed of a plurality oit' sections-10. all of which are alike in construction. Each stile section is joined with the next in the series by groove and tongue joints, separation of the sections being prevented, as will herein after appear, by the rungs 11. Each stile section isl provided in its upper'- horizontal edge with a` tongue 12 and in its lower hori zontal edge with a tongue 13, the tongue 12 extending horizontally from the longitulower edge of 'the mortise in alignment with` the tongue 13, said groove extending from the longitudinal edge 15 of the stile section toward the edge 14 and communicating with the bottom of the mortise 17 and beingD of a size adapted to receive the tonvue 13 of the next section in the series. there is removed from the lower horizontal edge upwards a longitudinal portion of the stile section along the longitudinal edge 1A thereof, as indicated at 19, there being an oblong mortise 20 formed in the structure remainingl a substantial distance above the lower horizontal edge of the stile seotionL- A horizontal groove 21 is cut below theupper edge of the mortise 2O in alignment with the tongue 12, said groove extending' lfrom oimilarly,

the longitudinal edge let od the mile section toward the edge 15 and communicating with the top'o said mortise` and being of a size adapted to receive the tongue 12 of the next section in the series. The portions 10 oit each section between the tongues 12` 13 and cut out edges 16,a'nd 19 respectively. form tenons which engage respectively in the top and bottom portions of the mortises 20 and 1-7. Tenon and mortise joints alined with the tongue and groove joints being thusl provided When the parts are assembled. Y

In assembling two sections of a stile,the upper portion of one is placed into the recess 20 of the other, whereby the tongue 12 of the t'ormeris brought into registerinu' position with the groove 21 of the other, the tongue 13 of the seeond-mentioned ses lil@ .no 'y tion is brought into alignment with the groove lh! ot' the first-mentioned seetion. (hie seetion is then shifted longitudinally in relationto the other. wlierehlv the eorrespondiingr groovesy and tonggut` are interloeked. 'Vt'hen thtJ eleinent l are in lhe=e po- S'itioi'is. they rannot mme laterally in relation to one another hy reason ot' the l'aet. that the tongues l2 and 155 do not extend throughout the widths of the styile seetion, ltA is also to he noted that when the elements arel thm assenihled. the inortises in the adjoiningr e'uls thereotl forni an ohlontr slot 22. When the end of a rung l1 is inserted into this slot, it prevents longitudinal `movement; of the stile lQeetions in relation to one another. holdin;- thus the l@tile set-tions in operative relation without the use of additional 'fastening meansh From this it appears that the runes art as wedges. forcing the styile sections longitudinally in oppositie directions.

What l claim is:-

Atltnoekdown ladder Comprising Stiles, eaeh inade oia plurality of set-tions, the ineeiint ends ol' adjoinii'izg` sei-tions being provided 'with tongue and groove joints extendineV only through part ol the width of said seetions. .said joints heiner disposed on orposite edges of the stile und spared long fitudinally thereof. said inenting ends heiner further provided intermediate said tongue and `groove joints with alined tenon and niortise jointsthe opposed ends of the renoml on the two sections heilig' spaced to provide a slot. and a runtr end inserted into said slot Serving' for directly connectingT the seetions of the `stile und preventing*r their longit'udinal movement in relation to one another,

Signed at New York, in the eount \v oi'V New York and State of New vYork. this 22nd day of June,' A. D. 1922.

JO EF GRNDICL.

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