US1873617A

US1873617A - Diving tank

Info

Publication number: US1873617A
Application number: US559867A
Authority: US
Inventors: Mehl Charles
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-08-28
Filing date: 1931-08-28
Publication date: 1932-08-23
Anticipated expiration: 1949-08-23

Description

Aug. 23, 1932, C. MEHL 1,873,617

l Y. DIVING TANK Filed Aug. 28, 1931 k3 Sheets-Sheet 1 INVENTOR. M

A TTORNE Y.

` 5 Sheets-Sheet 2 mm1 mm. am num. IWW

C. MEHL DIVING TANK Filed Aug. 28, 1931 Aug. 23, 1932.

,y INVENTOR. @Za/6%. @4M

ATTORNEY.

c. MEHL DIVING TANK I Aug. 23, Y1932.

Filed Aug. 28, l1931 s sheets-sheet 3 yfw'aw@ ATTORNEY.

IN VEN TOR.

f as lwill hereinafter more clearly appear, my`

Patented Aug. 23, 1932 'PATENT fOFQFICFE CHARLES MEHL, or PHILADELPHIA, PENNSYLVANIA pIVINe TANK Application led August 28, 11`931."57Seria1 110.1559386?. i i

-v yThe olojectvof this invention is to devise.-

i a novel divingtank'whichis adapted for one man operation, and in which the tank 1s constructed in such a manner that the movis provided' with a series of observation win- Ydows directed in dierent directions so that :the operator can always have` within his E vision the vohject which he isaseeking, even L 1G- though the tank is revolving.

A further obj ect of the invention is to pro-V Y of grappling armsand novelmeans for con. trolling them from within the diving tank. :With the ahoveand 'other objectslin view invention comprehends a novel diving tank. It further' comprehendsafnovel diving tank adapted for one man operation having 20 a plurality of Vobservation Vwindowsfacing 'indiferent directions, and provided with a novel arrangement and construction of grap- ;pling'arms and with novel means for controlling said arms. Y Y

iIt further comprehends a-novel construction andl arrangement ofjtank, and novel meansfo'r securing a'cable thereto..k Y' j It further comprehendsnovel` means for `cushioning the tank when ,itfreaches the'bottom ofthe ocean bed orj the bedl of a waterway. A

-lt -urther comprehends a novel construe-- tion and arrangement ot a revolving seat for tlieoperator. v x Y y Gther' novel featuresiof) construction will jhereinafter fully appearin thez detailed de. scriptionand the appended claims.

For the purposev of illustrating the invenvtionI have shownv in the -v accompanying "drawings la preferred-lembodiment Aof it A-whichin practice will give satisfactoryand ",vreliable results. It is, however, to be underf'stood that. the various, instrumentalitiesfofY which my invention `consists can .be variously arranged and organized, and the' invention 4is not-limited tothe precisezarra-ngement and organization of these instrumentalitiesl as i herein setforth. y 50 f liigure .1 `Vis a side .elevatiom partlybroken ure l. Y 5 ing parts are effectively sealed. The tankVV Y e Figure 5 is-asec'tional View .of the showing the calole connection. vide a novel construction vand arrangement' away, of a diving tank embodying my invention. 1F K u y `Figure 2 is a section on line 2--2 of Fig- Figure 3 is a sectional viewof a portionV of .a grapplingarm and its controlling mech- Figure e isa sectional view ofthe forward end of a grappling arm. i

cover,

4Figure 6 is av detailed view showing the Aembodyinglmy. invention. :The casing l; is f `provided witha rounded bottom 2 and eX- tending downward from the bottom 'are the wings 8 which are disposed-*at rightrangles i to each other so that when the diving tank: settles o n the bed of awater .way the tank IwillA stay-in position without revolving I .also provide 4cushioning memhersl injthe i form of plungers mounted .in the casings 5, and between the upper end ofthe "plungers vand the upper walls of the casings are interposedsprings 6, so that, whenthetank strikes the bottom of the 'water Vway a mechanical cushion will he provided. ,F our of these ,.cushioning plungers are provided in the` wings 3 circumferentially spaced around the I"bottom, and I also provide a centrally disposed cushioningplunger 7 which is constructed andl operated ina similar manner tofthatof the plungers already'described;

The upper end of the tank is provided 'with a removable cap or closure 8 having a downwardly. projecting threaded flange 9, the threads of which are broken orintermit jtentfand lthe threadedwall 10 ofthe :open- Y ing at the upper endof the tank is', in a simi` lar v manner, providedl with yintermittent4 or brokenl threads, sothatV a tquickg detachabley Ac-losurezis provided. l It zis thus unnecessary lil@ , closure and' tank. The closure8 is'provided with rarelief valve 12 controlling air com-y Va number of ldifferent directions. l sure 8 is provided withrfour circumferentlal-Y ly-spaced observation windows 13, which are which, when screwed into the wall of the tankV 1, prevent relative rotation of such munication between the atmosphere and the interior of the tank, so that the pressurecan be balanced after the tank is raised from'the water.

The upper end of the tank 1 is provided" with an annular groove lasshown at,13rintoVv which extends an annularrib 14 on the bottom oftheclosure 8,`and packingl is interposed between said rib and the bottom of the f annularY groove 13.1V providea 'series of observation Windows in orderthat the oper- Vator may be ablel to look out of the tank in i' The closealed in position: Y l Y At the-upper end` of the tank, I- also-'provide foury observation windows'14circumferentially spaced around the side wall, and

directed upwardly at an'angle.` I also prol vide the observation windows 15 Vwhich are cireumferentially spaced, four of them being employed, and these extend laterally fro-m the side wall'of the tank. Below the observationV windows 15, I'provide four down-1 fwardly projected observation 'windows '16, f Y vk cumference of the tank. 1 It will now be clear p circumferentially disposed around the cir- V Vthat I'provide16 non-breakable windows which enable the operatorY Qwithintheftank tosee in any direction.

, VThe cable 17 Yis connected withthe closure 8 in a novel manner, and` through this cable 'ext'ends the telephone connection 18, so that -the telephone connectionis? properly pro` tected and no injury can occur'toit unless the cable breaks. A fitting 19 is screwedlintoA the upper end of the closure V8y and in the j chamber of this fitting is tubular packing 20 in the rform of reversely inclined cones which 5 are compressed bymeans of a. glandf21 Y*against which bearsatubular closure 22, which isprovided with a threaded extensionof'reduced diameter inthreaded engagementY with the fitting ,19. The-chamber ofthe Yfitting 19 at its lower end is coneshaped toY conform to the contourjof the packing, and,

the chamberV of the gland 21--isalso cone shaped to conform'to the portionof the packingr-with whichv it contacts.'v The upperY end joffthe Yclosure S is providedV withA a cored space forming an annular channel 23 across f Y which extends'a solid rod 24 whichisintegral with the casting of which the vclosure 8 is" composedgji The cable 17 is wound around V this rod 24 so thatthe strains ofthe cable are taken on this rod; Theannular channel'23 communicates with the chamber 25, the wall of which is cone shaped Vand diverges downwardly in order to provide for the locking of the lower endfof the cable. The strands of the cable at this point are divided and pressed outwardly, and the lower ends' of the strands are wrapped around the rings 26. The space within this chamber 25"- is then Vfilled Awith molten metalso that the lower end of the cable is securely anchored to the closure 8. 'Beneath theterminal of the lower end of. the .cable the wall of the casing is'threaded to r'eceive a closure disc 27. This closure 27 has a Ycontact member 28 in electrical connection Vwith the cable 18, so that the telephone conductor 29 leadingtov the telephone Y3 0 can, be vplugged in.` 31 designates rthe oxygen breathing units,two lof which are suiiicient employed,VV which will supply oxygen under atmospheric pressure for a periodi of eighthours. The bottom of the tank has rising from ita standard 32 on vwhich-is mounted a revolving stool 33, hav- VVing al seat for theoperator, and thisfis ypref` erably mounted on lball bearings-34. a' j i As before explained,-I provide observation Y windows'arranged'in sets of four, andfb'e-` `tween twoadiacent lower observation wm'- dowsl provide a-grappling' device havingV vits own'findividual lcontrol located'within soY the tank in a positionaccessible to the opern ator. designates 'a grapplingarm, four of which are employed,--and they' are Vcomosed of several movably connected sections so that the position o'fthegrapples or'hooks 36 may be variedfas desired. Eachifgrappling arm is,V rotatably mounted. f v hand wheel ixe'd to the? hub of a gear 38vmounted ona stud shaft 39 carried `by the machine frame. The gear` 38 37 designatesr a meshes with a gear 40iixedto a gearr41 which f latter is 'mounted ony a stud shaft V42. The gear 41 meshes with agear 43D fixed toa reduced extension 44 of a4 grappleV carrying member inthe form of a slotted support 45.

This reduced extension 44 extends Vthrough an 'opening in the side wall of the diving'tank Vfandcarries a thrus'tbearin'g 46 lwhich bears V lic against` the-.juxtaposed recessed wall 'off-'the Y tank and the inner enlarged end I of Vthe grapple Yarm support45 with which coopf erates a'packing 48 which is retained ini positionl by means of agland 49. It will thus-be 'seen that if the hand wheel 37 is revolved the grapple arm support'45 will also be revolved.

V510* designates the first movable section ofthe grapplearm which is-provided atits inner end with a bifurcated Vportion 51jwhich extends into'the support45 and is pivoted thereto'by meansof the pivoted members 52 which form trunnions. The'movable section l50 at its outer end is bifurcatedto receive the bifl'ircatedl end of the movable section 53 .which is pivotally connected therewith as atdft.

Y The hooks' 36 are pivotallyfsupported at inthe bifurcatedend of an apertured arm -section 56; Theinner ends of the hooks are pivotally. connected :to 'oneend of the links 57, the opposite ends of'which are pivotally connected to an` arm 58 fixed to a rod59. rl `he outer end of the arm 53 isfrecessed to receive av ballbearing- 60 which also bears against a shoulder on'the arm 58 and' this i arm :is rotat= v ably mounted in the movable section 53' andis retained in place by means 'of al cap vnut 61 which is screwedinto the outer recessed end of the movable section`53. The rod 59 has adjustably mounted thereon a set collar'62 be- -tween Which'and a Wall ofthe movable'se'c'- tion 53 is interposed a spring 63.- The'rodp59 has connected with its rear enda cable 64 which extends rearwardlyand is connected to a controlling rod` 65 which Ais provided With `a graspinghandle 66.- The cable 64: rpasses through afbearing sleeve 67 in the movable grappling arm section 50 and the controllingrr rod 65 :passes through a bearing sleeve 68.

The controlling rod 65 also passes through the base block of a handle 69 Whichis retained imposition by means of a Washer 70 seat-ed .in a groove71fin the base plate. 'The Washer is secured by means of fastening devices 72 tothe gear case 7 3 whichlatter issecured to the tank by( means of fastening'devicesvv/l.

AThe controlling 'rod 65 is threadedV for al portionof its length asat 75v and with' this :threaded portion cooperates thef locking levers 7 6 having threaded segments tozengage Athe 'threads' -75 of the `controlling 'rod' r65.

levers 76 are pivotally mounted i on the rods l77 carried by the wheel. 69 and i theyl vare `provided -With reversely .inclined These locking faces 78 with Which `cooperates thespring `l`pressed stops 79 -Whichholdthe locking levers 76 in their locked Vor unlocked position.

. V'The first movable section 50ct a grappling "arm Vis controlled by a handlewheel 80 iiXed .to the hub .of a gear-81 mounted on the stud V.sl1aft82. The 'gear 81meshes `with a gear 83 oni a shaft 84:. The gear83 meshes Witha gear i 85 fixed to a gear .sleeve 86-Which is mountedinthe rear end of lthesupport'l and at its-forwardendit has lixedto it a gearv 87 which :meshes with a gear 88'fixed tothe inner vend of the grapple armv '50.1.- Itwill thusbe ,seenthatfwhen the gearf80 is revolved the r movable arm section 50 Will be swung onits pivots 52 in one'direction orthe other. The movable armsection 53 is controlled by the lis providedwitha gear 97 Whi'chmeshesvvith Vaga-instfthe gear casing toretainfthe:locking Y also Vbeflocked in they position to` which they,V

ing-sleeve 68 and meshing With a gea'i` l.9.5. Which mesheswith agear 96 .fixed 'to the bear'- ing sleeve .67 rlhe.sleeve67'atfits outer end a gear 98 iXedto the inner end of the second movable grappling arm. section .53,fso' that :.Whenfthe `handle Wheel 89 v is'revolved'ztheV Vgrapplin-g'arm''section 531will be'moved on its pivots 54k in onedire'ctio'n or the otherf@ Ther-.rotatable grapple varm .support T45; nisU15 recessed to receivethe gear carrier 862'and` thrust=bearing .99 is 'providedbffv Aisealing Washer 100 is interposedfas shown in Figure 3 anda threaded vgland 101 retains thisvash-n v er in position. w A sealinggasket is alsoJemf ployed as 'shown at `:102 "and aI gland .1.108.` vin threaded `engagement with the gear carrierv 86 bearslagainst suchsealingWasher. Y

In order to retain thfevcontrollin"members justed have provided a'locking'memberfor eachofthemf'f# ""f' The gear 381 c'ontrolledby' the hand vWheel fin the-position 'to Whichthey have .beenafd-f5L85 37 is retained in its locking position'by means n With gear teeth' to' interlock'fvvith the-teeth of the gear 88 and its shank is encircledby a spring Whichbears-iagainst the-head of thelocking member and .the gear-'casingf' rounded eccentric lportion r of; which bears member 104 in its unlocked position. The gear 8l controlled bytheihand Wheel 80'is secured in locked =or unlockedpolsition by` means of the locking member 108y constructed and operated in" a snmlarimannerto thatiot sary duplication. l rf In a similar'imanner the hand-Wheel 89. is lretained in its locked or unlocked positionl 1 by means or" `aflocking member -109 Which'zhas a gear-segment interlocking with thexteeth `ofthegeai-90.f-'A f i ..1

It Will thus be-seenthat at'the Williof; the i Y operator the-grappling rodmayl be n'ioved,V

inwardly or outwardly tof close; oropen the grappling hooks 36 'anditcanl also-Elbe rotated as desired bythe hand` Wheel '69 .which is locked thereto bythe Ylocking Vlevers 76.

The movable section 50 can beY swung i `its pivots by 'rotationofthe' hand. ivheel 80 andthe outer movable section'l can be swung on its pivots Yby rotation offthefhand Wheel89. y These segments '50 and 53'jcan have been'adjusted byimeansfof locking j members' `108 and 109 respectiveylyg *of-the locking member-lOetwhfich is providedg The shank'fof the locking `member i10 t-eX-5"95 4`tends through the.gearfcasingandhas -ecce'nv -trically connected with iti al Vhandle 2106,' #the f thel llocking member l v 104: so that s a detailed*105 description thereof Wouldinvolve unneces Y It will now be v Yance iwith this invention I `have devisedy ai novel d1v1ng tank wherein a novel construcand thus form a closed eye to retain anyl ar- 'the' headed plungerjs 4, thedownward position of .which is limited-by means of the nuts 113, it being understood that the' shanks of the r plungers extend through-lthe 'apertures 1 ofthe nuts 113. Theprassa/ges 114 lead Vfrom [the cylinders 5 tothe chambery 115 in whichv is mountedA a lvalve-sum1 116 which `is' lWing i s hapedftoV form apertures 117, th e stem carryingthe valve 118, Whichvlatter is adapted 15 to seat in the valve seat 119 and' thus close ytheinletvpassage 120 in thevnut121. The vr,branch conduits 122 are ofreduceddiameter and lead' from the passages v114C throughv the Y .ports 123 controlled by the; outwardly open- 20. ing valvel24 having a wing shaped stem, so

that, the waterinthe cylinders 111 can slowly escapeV through the discharge pas-V sages 125Y when the plungersY 4 strike the i.

bottom of a yWater way. It willV thus be seen that Iprovide anlautomatic YYhydraulically Y' y'actuated cushioningdevice for the diving .-tankL v y v "apparent that in accordtion y*and arrangement of;V grappling arms are provided' which enables'one to Work itfany one thousand feet. 'The telephone connection is Within the cable sothat it cannotbe injured without the breaking of the cable. Y

' 'The closure is sealed in position and. owing 7 to the interrupted threads va quick locking device is provided'so that a man can be sealed *o in or removed fromthe diving tankinabout Y* one minutes time. l

' VAll'the movable joints ,of the grappling.

' `arms' vareeequipped with thrust bearingsto take up the heavy strains tovvhichtheyQarer;`

'a subjected.V .TheV revolving Vstool. 'permits the i' v 'i and sealed in:saidiconicallyshaped chamber.

.4i-In a diving; tank;l ajchamberedtank, f a

l cover having a quick' detachable connection operator to turn quickly in any direction.

The diving tank is provided with two sepa- 1 Y rate oxygen breathing Vunits which enables v oneztolbreath oxygen under atmospheric presf sureF'or-afperiod of eight hours; .-1 Y ,i

1 -"The equalizing valve equalizes the Vpressure inthe tank in case of emergency. f l provide bothmechanical and automatic shock absorbers to prevent the operator Jfrom becoming hurt V`when the ltank reaches the bedof a Water Way. VI provide` sixteen un- -Y breakable Windows Which enables the o'per-V V"atorfto see inanydirection. f y l .I'also provide a novelfco"V er lockingdevice so that'thel Vgrappling hooks will hold.. onto "any objectfwithout requiring the use ofthe hands oftheoperator'l also provide a quick f Y locking'device to holdfthe grappling arm'vto Y Y ,means in saidwings. angle in depths-.ofwaterup to approximately n cushioningfmeans atthebottomfof said tanks Wingsf disposed yat :an yangle to yeach yother shown Lcertainiof;thengearsof,thewspnr, type ,l Y

Y but they would preferably all .be spiral gears.

The telephone connectionpreferably-"ex- 1tends through an insulatingsleeve 126. The c losurediscj 27-bears against a packingg127 so that the inner fend of the cable connection .is effectively sealed.'V

In Vorder that the cable 17 :removed i y .when vdesired lthegjnolten metal; which-,is pouredin to ,bind the inner strands in position ,is received. in. acasing 128, see Figuren.

I It will now be apparent that Ihave devised a nevi7 and use-fuldi'vifngtank which embodies lthe features-of. advantage enumerated asdel sirable in the statementlof :the: invention vandthe abovee description, -andfrvhile I have, in

the presentV instance, shofwn and describedfa .preferred VexnboCliment thereoffzwhich y@will give inv practice satisfactory landreliable .fre-

sults, it is `to'be understoodthat lthis V embodi-f` ment issusceptible of mo'diication'in ,various particulars Without departing fromthe spirit of its advantages.V

f1;;In a-diving tank, asealed yor. scopey l,of the invention ori sacrificing anyV top closure, ,Wingsfdispos'edat Vanfang-le` and depending fromy the?Y bottom of :said tank .to

form chambers, and r hydraulic f cushioning 2.? In f a diving tank,

lat thef'bottom @of the tank in which said. mechamcalchshioningmeans.ismounted, and automatic ,hydrauliccushioning means atthe through thebottomeof` the cover, .andaj cable in said chamber andwoundaround saidrod 1 With saidl tank and `sealedf'thereto',;gsaid y cover i 'having' an. annular. chamber surrounding a- ,transverse rod opening through the topgofthe cover and 'openinginto alconical vaperture leadingfthrough"the bottomof the, cover, a

cable in said'f'chamber surroundingfsaidfrod, and4 having its' strands. extending into said chamber Vand separated,f andV :locked ltherein With melted` material, antelephoneconnection leading v'through said cable, and. 'la teleA phone within the tank communicating with said telephone connection.V

, v5.1InfaY diving tankyatankhavingvviiigs i at'its bottom, disposed at; right anfglesto each other and'` hydraulic cushioning members at any positionto which ithas been adjusted.

p vthefbottoniof said tank comprisingjcylinder'sf 'Y Y @For convenience of illustrationl'IA have mounted Vin saidgwings, :plungerslwithingsaid 513 cylinders, inwardly opening automatic inlet valves in communication with said cylinders, and outwardly opening automatic discharge valves in communication with said cylinders.

6. In a diving tank, a sectional grappling arm comprising an arm support rotatablymounted on the tank, a section movably connected with said support, a second section movably connected with said first section, grappling hooks mounted for bodily rotation in said second section, a spring actuated rod to which said hooks are operatively connected, independent gear connections for each movable section, controlling means for said gears, a cable connected with said rod, a longitudinally movable controlling rod connected with said cable, a rotatable hand wheel, and means carried by said hand wheel to interlock with said controlling rod.

7 In a diving tank, a grappling arm comprising an arm support rotatably mounted on the tank, an arm section movably connected with said support, a second arm section movably connected with said first arm section, grappling hooks mounted for bodily rotation in said second arm section, a longitudinally movable controlling rod operatively4 connected with said hooks to actuate them, a rotatable hand wheel, locking levers carried thereby to engage said controlling rod, and means to retain said locking members in their locked or unlocked positions.

8. In a diving tank, a tank having wings projecting downwardly from its bottom and disposed at right angles to each other, spring pressed plungers carried by said wings,'and automatic hydraulic means to form a cushion for said plungers.

9. In a diving tank, a tank, a cover sealed therewith and provided with an upwardly extending portion, a packing member sealed with said cover and having a cable receiving aperture, a supporting cable, said cover having an annular passage traversed by, a cross rod, said cable passing into said space and around said cross rod, said cover havinga cone-shaped chamber communicating with said'passage, the free ends of said cable being spread out laterally in said chamber and anchored therein, a closure sealing the lower end of said chamber, a telephone line within said cable, and a socket in said closure connected with said telephone line.

10. In a diving tank, a tank adapted to receive an operator, a grappling arm carried by said tank and comprising a support rotatably carried by said tank, a movable section pivotally connected with said support, a second movable section pivotally connected with said first movable section, an arm carrying section rotatably mounted in said second movable section, grappling hooks pivotally mounted supported on said arm sections, a flexible cable connected with said hooks and passing through said movable sections, yielding means 4to 'cause the A'closing movement of said hooks,- aifcontrollingvr rod connected withl said cable andextendinginto the tank, and a graspinghandle'for actuating` said" controlling rodfand@thereby said Y.

bysaid first `movablesection,:.anarm section rotatably mounted in saidl secfondq-movableV section, grapplinghooks carried by said arm, section, a cable operativelyconnected with saidi grappling hooks` andextending through.

said movablesections, a controlling frod con-gl ',nected rwith .said cable, a bearing sleeve through which` said controlling f rod passes, and lockingjmeans cooperatingwith saidcontrolling r'od tof retain it in the position to which it-hasbeen adjusted.`

12;,In a diving tank,va tank, a grappling arm comprising asupport rotatably mounted in the wallof the tankfa'- movable section pivotedv to said supporta lsecond*` movable` Y section kpivotally carried by said first movable section, an .arm section rotatable in said sec-- ond movablesection, vgrapplingyhooks car-` ried. by saidz arm section, a flexible cable-*connected with ksaid grappling hooks vand jextending throughsaid `movable sections, a

controlling rod mounted insaid support con-Q nected with said..fle xible'cable .andlhaving threaded portions,` manually ,actuated locking mechanism cooperating with saidthreaded portion to 4reta-inthe grappling hooks in Y the position to which they have been adjusted,

spring pressed stops to retain said locking members in locked or unlocked position, manually actuated means to revolve said support, and manually'actuating means to effect relative movement of said sections.

13. In a diving tank, a tank, a grappling arm carried by said tank and comprising a support rotatably mounted in the wall of said tank, a movable section pivotally carried by said support, a second movable sec-V tion pivotally carried by said first movable section, an arm section rotatably mounted in said second movable section, ,grapplingv hooks carried by .said arm, a flexible cable connected with said grappling hooks and extending through said sections, a controlling rod loosely mounted in said rotatable support and connected with said iiexible cable, locking means cooperating with said controlling rod to retain it in the position to which 1t,v

has been adjusted bythe operator, manually actuated means intergeared with said .sup-

port to revolve it, locking means for such" gearing, manually actuated gearing to effect relative movement of said first movable section and said support, locking means for said last mentioned manually actuated gearing,

u ianuallyactuated gearing-forefecting rela-' e.

tive Vmovement between Vsaid secondi` movable SectionL Vand Vsaid ,first movable -sectio`n, andV L Vlockingmeans'lforthe gearing-for controlling relative'movementfbetween saidffrs't land y second sections. 1 Y uw y i 1.4:."Ina diving tank; a tankga grappling it f y Varm''Comprising y'a support rotatably mounted Y in the vva'll- Voffsaid"v tank, agmovable section Y Y l Yj() pi-votz'illycarried` by saidfsupport, a second movable section pivotally vcarried vby said first movable section, fan*amirseetion rotatably mounted- 'in said second movable section',V grappling hooksearried-.by said Yy arm' Vse'etioxu'. gearing [for saidY support i Yandintergeared with said irstvmovable sec-1 tion to effect'relative movement of it with said support, manually controlled' gearing intergeare'd with-said .second movable section and. Wit-h'- fsaid first gearing to effect rela-tive 130 movement of said'rst and second sections,Y Y f and locking means carried-by saidhandle .and cooperating with said 4 controlling rod to secure it in the position to which it has beenv adjusted an'dthereby secure saidg'rappling y a hooks in the position' to which they have been Y adjusted.

. Y .f CHABLESMEHL.