US1748799A - Extension ladder - Google Patents

Description

Feb. 25, 1930.

G. B. SCARAMUZZA EXTENSIONy LADDER Filed Aug'. 26, 1927 2 Sheets-Sheet 1 6 `I 1 2 ,w .m ifa :w Q n w l m m J/ I .f d w USLWHW l --.lw I I l u l I ILLA l I l l W 6 W m 7,@ DHU Flllww/- 11----f -----J |L. .A T., 0u un 2 a2 W l w .2 -l2 (w ,w ..`1 ll/MII. n f #la www@ l. ..[|L.||H 6 2 w M 7 Feb. 25, 1930.

G. B, SCAR'AMUZZA EXTENSION LADDER Filed Aug. 26, 1927 2 sheets-sheet 2 magma@ ATTO R N EY 'UNnED-STTES mareas' 1 i OFFICE 5 GIOVANNI B. SCARAMUZZA, OF LA CEIBA, HONDRAS, CENTRAL `AMERICAfi YL nxcrnivsloir LADDER;

Appncanonmea August 26, 1927. 'Seriali 110.215,73. 1

The object of this invention is to provide a device whichmay be used in complete form as a single ladder, but comprisingv two main elements which may be detached, and Yemployed as separate ladders,`-and further to provide a device which may be used as anexltension ladder or as a scaifold supporting device, adapted for service when resting upon an uneven base or upon the groundwhere l .'10 portions of the surface thereof lie at different elevations. v i

' A further object is to provide particular retaining means for holding the main sections l of the ladder in position for the particular use i 15 to which the device is to be applied at a given time. g Inlthe drawings forming part of this application,

in' elevation.Y

1 Figure 2 is a view in elevation, from the opposite side.

Figure 3 is a view in edge elevation. rFigure 4 is a view in vertical section. 25, Figure 5 is a transverse section Von line 5-5 of Figure 1.

Figure 6 is a section on line 6 6 of Figure'l'.v t Y y Figure7 is a section ,on line 7-7 of: Fig- 0 vure 1.

Figure 8Vis a fragmentary view in edge elevation, showing the relativeposition of the lladder sections when separated at the f lower ends, so that the device may be used as f .a'step ladder, or for'supporting a scaffolding.

The device comprises a plurality of ladders, or ladder' sections, designated 10and 12,

the stiles of the section 10 having longitudif n a'l grooveson the'inner surfaces thereof,

" 40 these grooves terminating in cutaway portions near their lower ends. The grooves are designated 13 and the cutaway portions are 'shown at 14. The section 12 of the ladder, f or the stiles thereof include brackets 15 hav-y 4 ing outwardly extending lugs 16 cooperating with the grooves, so that the stiles of section 12 will be retained' in proper relation to the A Stiles of section 10, but these sections are 5G relatively slidable, section l12 being ofvless width than the other section.

`Figure 1 is a view of the v`complete device,

Vvtomatically produced, and it is only neces- The transverse elements, rounds, 'or steps' of the sections aredesignated'lO and 12and these'` are adaptedfto lie opposite eachfotherf' toform ay type of double Vstep,when theseci-l tions vare'intheposition of'Figure4, the l'adder thenwnotlserving as an extension ladder, but Vthe same relative position of the elements forming the steps,V will hold goodl when sec'- v tionsl 1() and v'12'are extended, if'portions of the sections still overlap.

Carried by section. 1O`ofthe ladder are-- bracketssuchia's 18, providing bearings-19'for transverselrod'or shaft 20, this shaft carryingy an operating member, lever, or handle, 21', by means of which thesh'aft'is rockedi Arms or brackets 22 are rigid'with shaft 20, andl are offset as shown, so that the upper portion will lie above the upper surfaceA of the round-of section 10 of the ladd'er,andv the outer portionofeach arm or bracket' will vr`est=beneath the 70' f rounds of the section-12fof1the ladder, thereby supporting the latter when extended. As

the section 12 is moved upwardly, the rounds thereof, beginning with the third round or step from the top, will impart upward movement to the brackets carried by shaft 20, and will swing these brackets, and partly rotate the shaft, so that the brackets will be thrown i clear of the rounds and permit longitudinal movement of the section 1 2, to Vthe extent desired. These brackets on shaft are suiciently heavy to drop back to operative position, by gravity, so that reengagement is au v saryto move the extension element to the v position desired, and then proceed with the Y useof the ladder.

` Brackets 2 5, are carried by the stiles of section 10, and these brackets include inwardly extending arms 28, aiding inthe guidin movement ofthe slidable sections.

- In using the device as a step ladder, or Inaking any use thereof requiring the separation of the sections in V-form,- -thesection 12 is first elevated to a slight extent from its lower position, the recesses 14 being just above the lower ends of the grooves. When the lugs.V carried by section 12-are opposite the recessesV in the stiles of the outer section, the section 12 of the ladder vis swung outwardly at the bottom. The upper step or round of section 12 should rest upon the brackets carriedby shaft 20. Section 12 being swung outwardly, the notches 31 of plates 32 on section 12Y engage the arms of brackets 25', these'arms extending inwardly for the purpose indicated, and the main sections of the ladderl are held in V-form.

I-Iaving described the invention whatis n claimed is In a device of the class described, a plurality of ladder sections including Stiles and steps, means for guiding one section and affording parallel sliding and longitudinal movement thereof with reference to the other section, in producing an extension ladder, a transverse shaft mounted for rotation, on .one

of Vthe ladder sections, brackets extending ray dially from the shaft and deflected downwardlyV between oppositely located steps of the ladder sections, these brackets being adapted to support the slidable ladder section when moved angularly with reference to the other section, said slidable section including notched portions, and devices carried by the stiles of the section mounting the shaft, and extending inwardly toward each other, acting as guiding devices, of angular form, extending around two sides of each stile of the other Section during parallel movement between"` the sections, and adapted to enter the notched portions for pivotally supportingthe slidable ladder section when moved angularly with reference to the other section. i y

In testimony whereof I aiiix my signature.

GIOVANNI B. SCARAMUZZAF

Images