US1377095A - Folding scaffold - Google Patents

Description

UNI-raA stars JOHN n. nerr, or wns'rnoox, iviINNnsoiA.'

FOLDING scarroLn.

To all 'whom t may concern.' Y

Be it known that 1,'JoHN D. Burr, a citizen of the United States, :residing at Westbrook, in the countyof vCottonwood and State of Minnesota, have invented certain new and useful Improvements in Folding Scaffolds; and l:v do hereby declare the following to be a full, clear, and exact description of the invention, suchA as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to scaffolds, and the primary object of the invention is to provide an improved scaffold which can be readily folded into a compact form so that vthe same can be readily carried and stored in asmall space.

Another object ofthe invention is to provide an improved vscaffold which can be adjusted to vvarious heights and lengths, so that the same can be readily used Vfor the desired work. l Y

A still further object lof the invention -is l to provide an improved folding andadjustable scaffold which isy durable and eflicient in use, one that is` simple and easy to manube hereinafter more fully described, claimed and illustrated in the accompanying drawings, forming a part thereof,r in which:

Figure 1 is a sidev elevation of the iml Y proved scaffold, in operative position.

Fig. 2 is a similar view, showing the scaffold in its collapsed position.

Fig. 3 is a top plan view ofthe scaffold.

Fig. 4 is an end elevation of the improved scaffold. Y ,y I

F ig. 5 is an enlarged fragmentary bottom plan view of the scaffolding showing' the means for locking the braces in position.

Fig. 6 is av detail section illustrating the l lower surface'of the sections 2 and' 3 andy connection of a brace tothe base of the scaffold. v. .y

Fig. 7 is a transverse section taken on the vline 7-7 of Fig. 3.

Specification of Letters Patent. Patgnte Maly 3, 1921 VApplication filed. September 26, 1919.. v Serial No'. 326,430. i

Referring to the drawings inl detail,

. wherein similar reference characters desig-l nate corresponding Vparts throughout the kseveral views, .the numeral 1 generally indicates the improved scaffold, which includes the base 2 formed of apair of slidably con'-` nected sections 3 and-4and the supporting y legs 5. V

vrl`he sections 3 and 4 are each preferably formed from a single plank and are provided with a plurality of parallel arranged Vlongitudinally extending slots 6, which end' short of the outer ends of the base and provide a plurality ofinteritting sliding fingers 7. rEhe vinner ends of each of the sections 3 and 4 carry guide straps 8, which e`xtendtransversely across the sections andare then bent downwardly and inwardly into engagement with the lower surface yof the secpermit the same to be adjusted to the desiredlength.

The slots 6 terminating short of the sections provide a solid handportion10, the

lower surface ofwhicli carries the brackets 11k for the reception of the legs 5. The brackets 11 carried by the outer ends of the sections, are preferably formed from asinrvgle istrip, of Ymaterial bent to forinthe .U- shaped yolres 12 and the outstandingA attaching portionsl. rFhe upper terminals The legs v5 extend downwardly from the U- shaped yokes in diverging relation to each other, so as to form a relatively wide sup,-

porting base and the lower endsof the legs are connected'by a transversely extending brace bar 15. It can be seen Vthat the upper terminals of the legs can readily-,be swung on their pivots 14 into engagement with the thus form a veryv compact structure.V

'v The legs -5i each include a slidingV section 16, by means of which the legs can be adjusted to the desired length, so as to adjust ,ofthe legs 5 are .positionediii the. U-shaped,l l Vyokes l12 and held in place by pivot pins 14.

" the height of the scaffoid ana-each of the f sections 16 carries a spaced U-shaped yoke 17, which forms a guide Vfor receiving the leg 5. The sections 16 are held in their adjusted position by means of set screws 18 which are' carried by the sections 16 and which are adapted to extendinto the spaced sockets 19 formed in the metallic strips 2O carried by the inner surface of the legs 5. The legs 5 are provided with markings 21, in alinernent with the sockets 19, and the sliding section 16 carries a pointer or the like in alinement with the set screw 18 and thus when the pointer 22 is in alinement with any one of the markings 21, the user of the scaffold can at once see that the set screw is in alinement with vthe socket and can be threaded into the same.V The inner ends of the set screws have nuts thereon which fit into recesses on the inner faces of the extension members 16.

Diagonally and inwardly extending braces 25 are carried by the brace beams 15 so as to hold ythe legs in their extended position and the central portion of the braces 15 is provided with aV reduced rounded portion 26, which rotatably receives a split collar 27,

having the outwardly extending feet 28 which are positioned in the slotted end 29 of the diagonally extending braces 25. A suitable bolt 30 extends through the brace and feet for holding the brace inposition.

- The inner end of the brace has a plate 30 secured-thereto which is provided with a reduced hooked end 31 which is adapted to engage the hook 32, formed on the plate 33 and the latter is secured to the central finger of the section pivotally supporting the brace bar. One portion ofthe hook 32 is provided with a closed end 34: so that the Vhook 31 can only be slid into engagement vwith the hook 32 in one direction, and thel whenthe scaffold is in its complete extended position and the opposite diagonally eX- tending brace carries a link chain engaging i member 38, which includes a shank 39 carried by the connecting bolt of the diagonally extending brace .and collar 27 having an enlarged flat head which is adaptedv to be extended into any one of the links to hold the same against movement. To fold the device, the braces 25 are detached from the base and the legs are folded againstV said base as illustrated in Fig. 2. Th@ legs 5 Vset forth.

the most eflicient and practical; yet realizing the conditions concurrent with the adoption of my device will necessarily vary, I desire to emphasizethat various minor changes in details of construction, proportion and arrangement of parts may be resorted to, when required without sacrificing any of the advantages vof myfinvention as What I claim as new is: '1. 'A folding scaffold of 'the class ydescribed including a pair of sections having Vouter solid ends and inwardly extending inonally extending braces pivotally carried by said transverse brace barsy and arranged to detachably engage the lower surface of the first mentionedV sections, as vand' for the purpose specified.

2. A folding scaffoldV of the' dass de' scribed including a pair of slidably connected sections, pivoted legs" carried by the outer ends of the sections, longitudinally extending metallic plates carried bythe inner surface of the legs, said plateshaving a plurality of equidistantly spaced sockets formed therein, spaced U-shaped guide yokes carried by the legs, sliding sections mounted in said yokes, set screws carried by 4 said sliding sections and arranged to engage in any one of said sockets, said legs having graduations formed thereon showing the 'position of said sockets, anda pointer carried by the last mentioned sections adj acent to' the set screws, as and for thepurpose specified. Y

3. In a` device of the class described, a pair of slidable connecting sections, pivoted legs carried by the outer ends of the sections` transversely extending brace, barsy secured to the lowerends of the legs,` a pivoted diagonally extending brace .carried by the brace bar, a hook secured to ther free ends ofthe braces, a coperating hook carthe hook on the diagonally extending brace -In testimony whereof I vallix my signature being arranged to lit in the hook carriedl by in presence of two Witnesses. l the section, and a pivoted catch arrange to 10 engage the hook carried by the section to JOHN D RUPP 5 prevent the accidental displacement of the Witnesses:

hook carried by the brace, as and for the y A. HAYS, purpose specified. WM. KNUTSON.

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