US1926697A - Extension ladder - Google Patents

Description

Sept 12, J F MURPHY I EXTENS ION LADDER Filed Aug. 22, 1931 7 Sheets-Sheet l INVENTOR fimsfgagg ATTORN EY Sept. 12, 1933.

J. F. MURPHY EXTENSION LADDER Filed Aug. 22, 1931 7 Sheets-Sheet 2 INVENTOR 7 I ATTORNEY Sept. 12, 1933- J. F MURPHY 1,926,697

EXTENSION LADDER Filed Aug- 22 1931 7 Sheets-Sheet 3 INVENTOR ATTOR N EY Sept. 12, 19-33.

J. F. MURPHY EXTENS I ON LADDER Filed Aug- 22. 1931 7 Sheets-Sheet 4 INVEN ATTORNEY Sept. 12, 1933. J. F. MURPHY EXTENSION LADDER Filed Aug. 22, 1931 7 Sheets- -Sheet 5 INVENTOR BY amesIiZgg/Z ATTORNEY Sept. 12, 1933. Q MURPHY 1,926,697

EXTENS I ON LADDER Filed Aug. 22, 1931 7 Sheets-Sheet 6 INVENTOP ATTORNEY Sept. 12, F. HY 1,926,697

EXTENS I ON LADDER Filed Aug. 22. 1931 '7 Sheets-Sheet 7 g //ff)/// INVENTOR ATTOR N EY Patented SeptQIZ,

. one-half to Joseph Mich;

Application j: =EXTERNVSIQQNTLADDER' i i zciai 's. "(011 228414)",

' Thisinvention relates to eictension ladder con stru'ctions; and belongs particularly to that type of ladder comprising a, number of sections mov able one in or upon the 'otherQ-Withmeans for extending theladder sections, andfor 'r aisingthe ladder. This invention is concerned likewise with ladders of the character stated which are asso It' is the objectbf this mitt n to produee an extension ladder comprising pertsjof-special construction and combination, and inclu c lingfanadjustable cage'at the top whereina; 'workjman} may stand when employed in painting a. side wall is believed thatth e" special construction herein. specified results in'en especially convenient,easgo iiy operated and durable structurewhich will withstand continuous fuse without d ep'reoie,tiong.

or excessivewearl f j A Inthe accompanying drawings-are illustrated the various parts of this invention, showingthe construction andarrangement,thereof. Of--the drawings; Fig. '1 represents ja. plan"view o'rfto'p View showing allparts assembled. v g IjFigg2 is a; side 'view' it: ai fvertical position of; the ladderindi'cetecl in broken lines.

i Fig. 4 is a yertieal sectionjtaken on the broken Iine '44; of Fig. 2 l king-towards and showing Fig. 5is1a side 'view of oneief thefjac'k's, portions. thereof being broken awaytolglisclose in,-

Email-Jams. i

*Fig. 6 is stop iew of the endof onefl attfie ly mm erslmihes m r -m o a top View Jof one of the jacks ettzichedt'o' theba'r f and, showing the groun i'plate ofpthe jack;

" Egg. '7 is a, vertical section showing one channel iron side :of the supporting frame; and one of 15 the means of clamping thebarend frame.

J Fig'.8'is a; side viewoi a; portion of the ladder extended, showing theflrelative positions ofthe sections, and i the 1 cable, connection, operating drum'and sheaves by which 5i) ladderare-extended. i r

the! sections of} the seetions of the ladder showingthereteht' geer held in; extended position,

are also provided forrevolvi'ng and. controlling qaiij'oui'id thering to support thej'ca ge bottom; v

Rig. 1'! 'ishfside v ewof thejuppersections oj the Q V ladder extended, and:somewhat:en1arged;j;showi gih cas inj Pl e i U p extremity o the'topei tiong. '21} of cagelagider showing 'trejck c abies thereforfland 5 u h u th d aw r n e semenumber is'used to refer 'to' the ome part the sliding "or laterally movable bars thereof ,i with tre,ted even with the upper surface orfioor of the 5 "turntablefi, j Bearing upo thefouter edge of the;

the preferred construction jof thesectionsend the manner of, their niovablerengagementTonewith another. j Fig. llis aiside View oftheiupper end of the 7 top see-nonfat *the leoider, 'sliowing the, brake 0} wheel with the brake band thereon, and the brake Y onera ting levjerby which the brakewheelis held. J

The brake wheel is 'shown upon one of thetrum' nions or the support hoop of the cage,gwhieh hbfopi V and cage are hfeld inposition'by the brake deer 5 Figf12' isiotop Viewpf'theicege showing the I "position of theb'i akewheel on thejsupport hoop support hoop, thetrunnionsjend thebrake wheel f of a house, for exemple, orsim flar occupation." It' on one of, the trunnions;

' Fig, 14 s sectional viewsliowing the top hdo'fi; Y

This" view is enlarged.

- 1 zjsig. s is se'ctionelflyiew of "the stench hoop showingonej ofthe trunnions with thebrake wheel ,jattached'theret 'flhis'view; is e lar ed; I

flFig; Yl8is"alperspectii ejtiew or; modifie ci'forrn i weights 'for "keeping the track -,cables teut.

[Considering the drawings, a supporting frem eoe bfeny chosenjf ormm a ybe enigloyed'. Usuallythe? V f frame hasjtheside channelirons 1 and;2; the-end pieces 3,, andthejunct'ions Qffthecross fpieces' and. 2

side pieces are reinforcedby the corner 'plates.

Thefreme also has the: intermediate cross beams 5 best shown inFigQZi, 'andfuponfthose beam'stisq, secured a lergegeer 6,'Whi'eh, encircles 'eihub 7 9 The hub. Z is hollow vertically and rises as 'iilus turnt tble' areirollers 9,,fcarriecl by the brackets :10 r V attached to the frame. Belowthecircula rfid e'of .19 I 5 the turntahle directly beneethft he rollers Q jar I likelr'ollers 11', and therim'of the: turntable is rejstreiinedto'its cilcularpalth'fas it is revolved As best shown in'Fig; 3 Ta, shelf 12 ri s e's" rota tively' 1 imp n the tu table a it new nt 1. e e h 9 and description the,

7 yond the sides 1 and 250i the frame, andto clamp 1 the bars together and fl): their positions-when exis rotated trolled. x

of the'large gear6, and a small gear 13 is secured to the lower'end of the shaft 12 and in meshwith the gear 6. By means of a hand wheel lon the top' of the shaft 12, which is extended a convenient distance above the turntable, the gear 13 and theturntable revolved and con- In Fig; l are shown the lat erallyfsliding bars or brace angle irons 15. Those bars. 15 .slide lengthwise side by side in opposite directions bee tended there is provided a clamp 16 controlledby abolt 17 which passes throughan end-piece 3' of the frame as also shown in Fig. 7; At the outer end of each sliding bar 15 is a jack referred to as awholeby the number 18. s The individual con- I 'structions of the jacks and the parts for their,

adjustment are. best illustrated in Fi'g.-5. The housing 19 has a vertical chamber 20, and a side compartment '21. ,The housings 19 and the ends of the sliding bars 15 are'rigidly connected. "Within the chamber 20, is-a stout pipe 22 Wan vertical series of teeth 23, A base" member 24 hasa screw threaded .upper'portion 25* engaging in ternalthreads in the lower "portion of thepipe orjcylinder'22. Through the lower partofthe base member 24 is a transverse bar passage 26 in whichthe endof a handbarmay be inserted to turnthe' base member 24 whendesired. The handbar isnot shown. 7 Any suitable rod'will answer the. purpose. The base portion124; ofthe jack has aspherical seat'27 for a ball28'that rises ment vertically of the jack by turning the engaged screw threaded portions 25"'of "the base members i from the ground plate29. Thus there is auni- I versal' joint between the jack and the ground, and any angular displacement of'the ground plateis' corrected by the universaljjoint, and'the frameof the ladder, may be'arranged on a level. This leveling .of the frar'nejisQassiSted by 'the adjust- 24- by the hand bar mentioned; housing 19 is raisedor loweredby means of a small gear 30 in the comp'ar trnent2 l; The gearis rotated byits shaft 31, formed as shown in Fig. 6 forfthej at- I tachme'nt'of an ordinary crank handle,, not shown.

, introduced topreventthe .contrary rotation of the-{jack shaft 31 where it is desirable. It is 1 Any form .of'fpawl and *ratchet devices. for example,'such as those illustrated in Fig. 9,1ma'y be held to be within the purview of this invention to runaj suitable setscrew through the end bearings 32 for the jack shaft'31 by, Wh Qh'the shaft and gear 30 maybe held stationary, or released at. the will ofthe operator, 'f As best illustrated inlFig. 3,; a post 33 is erected on the turntable 8 at apoint in rear of the oen'ter, and the post 33-has a" pu1 y 34 i h top one transverse shortshaft 35: Asjshown in Fig. 2 at the left near the rim of the turntable ingthe drum or reel 4l'and cable42, which passes overjpulley 34 on postf33; and fis attachedto a truss 43 erected on 'one of the'ladder'sections; In Fig. 2 theca'ge'shown at the extremity of. the upper section of, the ladder is.rererred tohas a Near" one end'of 1 the frame; as illustrated Fig. 2 is a tank 45, and between the; tank and the turntable and upon the 'floor plate l6 which is supported upon beams such as the intermediate cross beams 5 is located a motor 4;?- belt connected with a pump 48, and the pump is arranged to force fluid through the pipe line 49 from the tank 45 to thedrum 50. It will be understood that the piping 49 as shown in Fig. 2'extends first I to the pump '48, and thence below the center of the. turntable. The pipe line passes upwardly from beneath the frame through the hollow bearing 7 o f the turntable. The drum or hose reel 50 has wound thereon a hose 51 and. the hose is connected with the pipe line connection of the reel so that fluid may be sent through the hose. Suitable valves may be introduced, and at the top of'the hollow bearing 7, as shown in Figs. 1 and '2, a cylindrical rotative pipe joint 49a is'provided to permit the parts of pipe line {19 above. the turntablefto make acomplete revolution therewith whilefinaintaining open passage Wlth thejpipe in hollow bearing 7; Itwill "be understood that thefpurnp'andmotor may, be used to serve compressedair jfor' the use of painters or sand blastjwallcleaners. The motor is not limitedto the operation of pump for fluid dise tribution'."

"As bestis'hownjin Figs. 1,2 and 8,'a drum'52 carried by the ladder 39 is Wound by the cable 53 that passes over 'thesheaves 54 and is attached gto'thepoint 53' of the'top section. The cable is passed first over the top sheave of the lower sec ti'ongand jthenoearound the lower sheave of the next section so that when the cable'is drawn upon-the sections are extended 'as will be readily understood from Fig. 8. To retain the sections in extendedcondition, the drum shaft 550i drum 52 as bestsh'own inFigL; 9'has agear 56 engagmgaigear 5 thelatter being a ratchet gear and provided with the. pawl; 58. maybe held extended or released at will.

bus, the sections Considering Figs. 8 and 11, it will be noted that ;the top section of-theladder has'an'end plate or cap 59, andthrough the plate 59 there is'fpassedone trunnion 60"of the cage'support "hoop 61. The "trunnion is best illustrated in Fig. 15. To the trunnion 60 iskeyed. a 'brake wheel 62 'h'aviingia brake band 63,.' one end of which is pivotally secured by pin '64 to the end plate or cap 'ofi'the section. A brake lever 65 is connected by the pivot pin 66. to the other end 01 thebrake band, and the lever. l ias a pivot '67,

.on"aproj ection'68 'of the cap. The projection 68 is a pivoted piece or arm substantially of the 1 30 curved form illustrated in Fig. 111 and thepinQ64 connects it with the cap :or' end plate 59'. vAs the lever is pulled downwardly the band63 istight ened around the" wheel 62, and the end of the its band engaged by the-pivot .66 is. pressed against 1 the Wheel; [When the brake iever is operated the support 1156 5 611 is held'or. released. I Asillustrat d 11 Fi 13 the Su por en 1 pa s be .tween'rollers 70-and 7l on plfojecting members of the cageso, that thecage asa whole may be rotated-about a vertical axis. It will further be -=now understood 'thatrthere are two trunnions .such as 60 and the second trunnionlpasses piv- 'otally throughthe cap plate or head of-the fellow sidemember of the top section. In'other words,-?thef'two side members of the top section o'ffthe' ladder. are eachprovided with cap plates 59 as shown in Fig. '8', and the support'ho'op; 61 has twotrunnions diametrically opposite each s'othenpivotally engaging thetwo cap plate 59. 1 50 The cage 44 swings on the ,trunnions aindrmay rotate on the s'upportho'op, 7 Considering Fig. 16,"it

rim turned up over the lowest ring73 of, the cage. It is upon this floor that theworkman stands. His position, is always upright, asv the cage swings on the trunnions and assumes when the ladder is raised and extended aeposition-sub- 1o floationis clearly set forth in Fig. 18.

stantially as illustrated in Fig. 17'. I

In Fig. 18 is showna modified cage and supporting means which is sometimes advantageous} In the figure, the top ends'ofthe sides oi the upper ladder section 3 9 areprovided-with a transverse shaft .74 upon theouter ends of which are grooved pulleys 75, and midway the ,shaft has a pulley 76L Over pulleys '75 pass cables 77, which also pass through the ends 78 of the draw bar 79,. of a platform'cage, whichlis raised and. lowered by the cable 80 passing over the middle pulley 76. The cables 77 are guidecables, and they are kept taught by theweights 81, in order that the cage maybe raised and lowered without excessive swinging. It is thought the modi- The operation of'this invention is as that of extension ladders of similar construc tion. The ladder -may be extended as desired by means of the'cable 53, andraised or lowered by the cable 42 It is'customar'y in practice to support the upper portion of;the ladder when not in 'use, inthe inclined position illustrated in Fig.2, by means of the vertical end frame 69; to clear-the tank 'and parts adjacent-and'to relieve the cable from constant'strain. The cage r 44 swings into position with its axis vertical in response to the'weight of the workman, and the brake wheel and brake band with the hand brake" leverare used after adjustment to prevent-the cage from unduly swinging upon its trunnion' bearing support hoop; The ladder maybe raised to any height, and turned .into anyposition at will be noted th t a; metal floor plate 72 has its peripheral edgefor' the same the side by is-located demands a broader ground base for the frame, the sliding bars may be extended be- .yond the frame for any distance necessary, and

then adjusted by the jacks as set forth.

Having now described'thisj invention and "its use,Iclaim:-- i

1.1In an extensionladder, a supporting frame, in combination with aturntable carried by the for extending the ladder, means carried by the controlling the turntable The frame 7 i .may be, brought to a desired level by means of the jacks, and if the altitude at which the cage turntable for raising theladder in any rotated position of the turntable, a hose reel vcarried by the turntable, and fluid servingconnections' passing upwardly through the centerxof revolution of the turntable whereby fluid under pressure, may be served to the said hose reelduring a 7 complete revolution of the turntable.

2.-In a laddermechanism, a supporting mine," P i in combination with-a turntable, agear borne- 4 by the turntable and a stationarygear carried byl'the frame'in engagement with the gear first mentioned, a hand wheel'and shaft carried by the-turntable foroperating s'aid ge'ar whereby a I fireman uponthe turntable may give samea complete revolution in either direction, a ladder carried by-the turntable; a hose reel carried by i the turntable, and fluid serving connections passing upwardly through the center of revolution of the turntable wherebyfluid under'pressure may be Served t Said o eel during a co plete em fi 0f u a le.

r V P-JAIVIESHFQ'YMURPHY,

Images