US1446228A - venable - Google Patents

Description

Feb. 20, '1923.

W. M. VENABLE.

TURNTABLE.v

FILED JULY 11, |922.

4 SHEETS-SHEET 2.

W1 TNESS ATTORNE v5 4 SHEETS-SHEET 3.

Feb. 20, 1928.

. w. M. VENABLE.

TURNTABLE.

, FILED JULY 11, 1922.

WITNESS Feb. 20, 1923. vv. M. VENABLE.

TURNTABLE. FILED JULY 11| 1922. 4 SHEETS-'SHEET 4- WITNESS space, or on steep grades.

Patented Feb. 20, y192.3.

l *i 1,446,22e

nutren'ermeerATENT OFFICE.

wrnnrnivriu. vNNriBnnor rrrfrennneer., PENNSYLVANIA, AssreNola To BLAW-'KNOX contraria', e oonroen'rroN or NNWJENSEY.

TRNTABIE. e e e To all whom t may concern.' e, 'y

Be it known that'l, WILLIAM `MAYO VEN- ABLF., a citizen of the United States, residing at Pittsburgh, in theeounty of Allegheny and State of Pennsylvania, haveinvented certain new and useful limpro'lvekinente` iii Turntables, 'ot which the following is a speciiicatioii. e

My invention relates to turntables suitable :tor turning road vehicles, and especially use-1 ful Ylfor turning automobile trucks as an in cident of road construction. rlhe7 invention is particularly 'advantageous lfor turning heavily loadedtrucks lin a relatively narrow Hitherto, turning of trucks under such circumstances hasy been accomplished only with diflioulty inconvenience, at'best; buty with ijny ,'tu'intable, it can be'jdon'ek quite n readily. y f n ln the construction oii concrete roads, -for instance, it is yusual to prepare-thereubgralde with so-called side rails7 or ori'i'ie either side, and afterward lill inbetween such side railsl withconcrete to 'torni the road. For tins-*latter purpose, the v concretey is dis;` tributed from a iniirer, which ist shiftet, ahead along 'the eubgiade Ias the work ad-Y vances. rlhe broken,stondeand or other ingredients are delivered tothe mixer by motor f trucks, which inust generally approach it V around.

over the subgrade, dump their loads, and then return in the direction whence tney aine. rlhe trucks inust, therefore, be turned As a general rule, such roads are about 18 'feet in width, inore lOrfless, and it is'tound desirable to employ tive ton trucks for haul-r. ing the road materials. It is practically iinioiisibid lioifever, ttor a tive ton truclrt'o. turn' itself iii/anything like the space between the side rails of such a roadway; andeven it the side rails were removed or oinitted in an "oroiuiate section .ot the prepared roadsuliicient' rooni wouldv `not always be available-to say nothing of ythe difficulty :ind damage incident to having the trucks we l l nach and forth at` the steep sides ot' the subo-rade. In road building on any consid-` erable scale therefore, it is often desirable to ni-Ovide ay turntable for turning the truelzs. turntable ehould preferably be `so lo- 1322. Serial No 574,129.

iii-St) in tliedirection'whence it canne. ,ln

"order that'the returning truckinay not have to drive over the turntable', it is desirable to place the latter in one side of the roadway, leaving room at the other eide Jfor the truck to pass.

Many trucks, however, are of such wheely base length (diagonally, troin one front f Wheel to the rear'wheel on the other side) that even with a turntable theycannot be turned between side rails 18' feet apartaiot" even, in tact, it' the handicap involved in placing the turntable to one side of the road as above described did not'exist. Evenwhen the' diagonal wheel-base lengths is aelow as 14 feet, moreover, it is impossible totbalancejsucli 'a loaded truck "(to perinit ot its being' turned quite easily) on any turntable that can be operated in an 18 toot roadway. For as trucks are ordinarily constructed, some ot' the weight is `carried on the rear wheels (whichv drive), andoiily 30% on the front wheels .so that in order to balance a'truclt ctie toot wheel-base, the rear wheels Should be about -lfeet back t the turning center, and the' trent wheels aboutr 10 feet 'forward troni the center. "To allow the truck to drive on the tabletroin either 3 end and be properly balanced, then, the turn'- table would have to be over 20 feet long,- which is out of the question. l vIn actual.l practice, turntables hitherto used for road work have been made only 14: or 15 feet in diameter, in order that they may be set and swing within the roadway; and rit has been impossible tocenter trucks over the turning center. Then such a turntable can be set level, the additional `:friction entailedby eccentric loading does not bring the total resistance to turning so high'as to be at all prohibitive: but when the table on a grade sloping sonic et or 5% and 'the truck approaches un hill. the best eiiiplace,4

nient on the table that is possible n'illrleeve lthe center of gravity short ot' the center ot turning, so that in turning the center ot gravity inustbe inoved up. hill. A live ton lll() (see especially it is quite beyond the power ot one man if conditions are such that its center of gravity must be moved up hill as much as 6 inches.`

As a practical matter ot tact, indeed, it 1s found virtually impossible tor even three or tour men to reverse a 5 ton truck on a turntable where there is a substantial grade.`

The preferred embodiment of my invention hereinafter described overcomes these detects and limitations ot turntables hitherto used-making it possible to balance and turn (full loaded) any commercial tyge I of truck (if within the capacity el' the table all necessity tor cumbersome and costly.

stationary ramps such as hitherto employed at the ends oit road turntables. Y f How these and other advantages can be realized through my invention will appear from my description hereinafter ot the best 'embodiment or the invention at present known to me.

1n the drawings, Fig. 1 is a somewhat diagrammatic. plan view ot a turntable constructed in accordance with my invention, in place in one side ot a roadway, and turned to extend lengthwise oit the latter;

Fig. 2 is an elevation at right anglesto Fig. l, showing `the turntable swung across the roadway as in turning a track;

Fig. 3 is a plan view of the turntable a larger scale than Figs. 1 f grammatic;

Fig. t is a corresponding side elevation;

Fig. 5 shows a longitudinal section through one oi the traclrways provided for the vehicle wheels in the form of; turntable illustrated, 'taken as indicated by the line 5 5 in Fig. 3;

Fig. 6 is a plan view ot the rotating and stationary parts of the turntable, minus the traclrways for the vehicle wheels;

Fig. shows a corresponding longitudinal .midsee'tion, taken as indicated by the line 7-7 in Fig. 6;.

Fig. 8 is a corresponding end. eleva-tion, from the right ot Fig. 6;

on and r2, partly liathrough the movable turntable proper, taken about as indicated by the lines 9--9 and Ylll-10 in Fig. but on a larger scale; and

Figs.y 11, 1Q and 153 .are side views of a shittable ramp and support:` 4 ed, with its opera-ting mechanism. on one end ot' the rotatable table-showing the parts in several different positions.

The turntable illustrated in the drawing igs. l. and 2) comprises a mounted to turn on va statable structure 3 shoe mounttionary supporting `base 16 that rests on lthe subgrade g. Instead ot being set very v (say about a foot above the subgrade) as to clear and swing over the rail r at one side orp the roadway, and the berm, etc., beyoVnd,-or any other ordinary obstructions. The absolute control ot the road width over the greatest radius oli the table platform being thus transcended, the table is no longer limited as to overall length. It is perfectly feasible, then, to make the table 2O feet long or more, so as to permit even the very longest motor truclrs to be properly balanced on it. .and with a truck substantially balanced on the table l5, neither the base structure 1G itseliil' nor thev outermost portion of the table structure that bears on Athe base need be ot very great width in ortering factor. in reference to passage of vehicles in the other side ot the roadway,- narrower than the table 15 itself, in fact. 1t is quite feasible.. also, to place a truck on the table with its center 'of gravity beyond the center ot turning, so that the center of gravity shall move down hill and the weight ot lthe truck thus assist the turning.

ln the present instance, yonly the one overhangingend 'li' ofthe turntable platiorm elevated so as to clear thc rail 7^, as described above. rlllie other overhang-ing` end 1.8 slopes gently downward to a pointq'uite close to the ground, so as to serve as a ramp `tor a truck going on or ott the table. lit, then, the elevatedv end 17 is made long enough to allow the'longest truck to be balanced on the platform when facing toward that end, as shown (say some 12 teet 'from turning centerl to outboard extremity), tlie I `dowmvard sloping ramp end can be made Figs. 9 `and l() show transverse sections.

materially shorter. as shown (say some S on the table om the.l ramp end; but this han oiliset by the concomitant vadi'antage or" dispensing with a long. heaviv v ramp iforeither end ot' the table. i now, also to Figs. Jl and 5, observed that in the present instance the sloping Lrali'np end'lSo-thetable is well clearof the ground fQs-ayisome 8 oriy 4 inches) at its vextremlity,so .tha-t fthe usual inequalities .of the .'subgrade ig awill not interiere with itsimovement 4.at all; `The ramp 18 fis supplemented,Yhowever, with arela ti ,rely shortauxiliary iramp orinclinedshoe20 (some 2 ffeet :long or lessi), movablymounted at the extremity oit-the :table endilSso that it can Lbe shifted intocor .outot Igliounden-` raging position, :occasion-may require. `When ingroundengaging position, this *de vice 2O .supportsithe table lend yL18 1 against tipping underthe unbalanced `weight-oi: a

truck inthe act of mounting or leaving thek table. When the ground is sott ratherthan' perfectly hard and ,tirnuastout metal-.plate 21 (Fig. 41) `may `be placed in positionfto afford .a iirm bearing forthelrampshoe 20,; and to prevent the ground' lfrom being cut shown, auxiliary` supporting means Lto prel away bythe yshoe'lheel lin operation.

vent overtipping are ralso'fprovided for `the elevated or long table end 17,;-1ntlieforirn oft' a,shoe-'.22-mo'vably mounted at the 'eir-y tremity yof thisendd-y sothatit `can vbe shitfted `from ground-engaging positioninto an elevated 4position Where it will clear thezroad .rail fr without difiiculty; yThe support afforded the table end 1.7 by thisdevice 22 prevents this end :from tippingldown on the ground in I'casev `a 'mounting trucky is driven materially beyond balancing position on :the table, `or in case the Wheel ibase length of fthe truck is `so great' that/the liront wheels pass beyond the turningitracks 27, 29 before-the real-:Wheels havebegun tol mount the table 4at Lalla, while the ustability of `this device 22 :permits 'the tableto swing freely with a properlyjba'lance'dtruck.

ln order :to avoid,complications from -inequalities of the ground, the anti-tipping supporting means 120, 22 at opposite endsotthe .table structure .'15 may-preferably be made separately operable, rather than-provided with common or interconnectedoperating means.

is here shown y 8), the base 16 comprises a :bottom plate or sled 26 that rests yon the ground, a jcircular supporting track 27 rigidly .secured to the sled 26, so as to help in Pbracing and stiii'ening the latter, and a central fhollow boss or stud 28 valso rigidlysecuredfto ythe sled 2G, for the purpose oit properly center ing` 'the rotary parts with reierence vto the base. The rotary table structure 1:5has

i n circular track 29 (conveniently ydistinguished as the turning track) for cooperating with the base -track 27, and vis kept properly centered on thelbase vby meansvot a pivot or kingpin 731 socketedinvthe `hollow boss 28, and engaged in a hub part of the table structure. As shown, the :forward margin ot the 4sled plate 26 is curvedmerely engaged 'upward somewhat, ,andaprovided with grabeyes 33 `for .the attachment :of a bridle claainr v for )pulling the Whole '.iturntahle forward along lthe subgrade away tromv the mixer) from .time .fto1time, a-sethe work advances.

s ln order ito minimize the' frietifonal .resistance `to turning' ot the rotary table struc# ture `.15, a .mwltiplicity of fanti-friction roll# ers 535 -maybe interposed lbetween the -fbase and; table`ftraoks-27 `and29, Aarranged in a circular series.y As shown, these rolilers are mountedron axlefspokesror rods radriv`atingrom a common hub mounted and centered on av `bearing portion of lthelbase ystud 28, concentric with ythe tracks '27 and 29.v :Collars 3S fixed to vrthe spoke-axles or rods 36 prevent inward displacement ci the rollers 35;Hand a V'circumj-acent hoop or circularband y40 mounted on the l(nite-r ends-ot the rodswprevents outward radfialdisplacement .oit therollers fand spaces` and bfraces the rods As shown, the ends `of the Nrods-36 uare notches 41 inthe band '40, so'thattherod's havefsome up and down play, andthe rollers 35 `are free for rindependent vertical self-adjustment -to follow any irregularities oi' the rail` "freely (2i. e., are ne'v'er restrainedby theband" from bearing fully'v on the rail,

even if the latter b'esunfacehentk from a flat ci`r e), though held definitely spaced' circumferenti'a-lly.

Nuts 42 on the outer yends of 2the rods 36 hold the band 40 in place and intruefcircular shape?. The rollers 35 may lpreterably be peripherally'rou-nded or cambered some What (but not spherical), as shown, so that 4 they shall not/tend to bind on track or rods,

y and `of lvery hard 4material,.or case-'hardened `members 45 of each trackway 44 are interconnected and held in proper lrelathre posidownward opening tions by channel-like cross bars 47 having at ltheir ends feet riveted or otherwise secured to the lower channel lan'ges (inline with the turning center at 31), as well as: by ra :trans- Verse channel bar 49 extending .and secured i `ac-rossfithe ends of 4all lthe side members at the outboard extremity oft'theel'evated tuble end 17, and serving as `a stop or bumper to prevent a truck `from accidentally running oit the `table at that yend. y

Besides the ,turning track 29,the struc.g

`ture ior supporting the trackways 44 comprises a rectangular `vtrame "50 overlying and securedto said .track 29, .and also .transrersev memberssl (including pairs of channels arranged back to back) outside said track 29, connected to and supportedl by saidframe 50. As shown, the trame 50 includes a pair of inward-facing longitudinal channel members 52 closely paralleling vthe inner trackway sides L15, and (like them) resting directly on the base of the inserted rail 29,. and also a pair of transverse inward-lacing ,channel members 53 with their endsresting on the rail `29, abutting and securedto the channels 51.` Sheet metal strips 54 and 55 extend centrally lengthwise and crosswise of the frame 50, so as to intersecty at its cen-k ter, where the centering hub-32` is located. At theirends, the strips 54 and 55 are secured tothe lower iiangesof the channels 52 and 53, and at their intersection, they are secured together and to the vhub 32 beneath them. The longitudinal frame members 52 overhang beyond the track 29, and in the spondingly curved plates 57 riveted tast tothebacks ofthe members 52. These yokes v56 straddle the pairs ot-channels forming the members 52, and their cross'bars 58 (on which the latter rest) are secured to the yokes by nuts 59.

,In the constructionillustrated, the inner trackwa-y sides` 45 overlie and reston the transverse members 51 and the track 29 be side the frame 50, and are secured to the.

frame members 52 by means of bolts 61 (see Fig. 9) extending through said members and the plates 57. The outertrackway sides 45 are securedto the outer ends of the sup` porting members 51 by means of bolts 62.

In order to permit the turntable ,to be used in a narrow roadway, it may be found desirable to provide clearance under the outer trackway edges sutlicient to perimt either trackway to overlap a roadrail r somewhat i'or most of or even the entire length oir the trackway. As here shown, this is accomplished by making the outer portion ot each transverse supporting member 51 in a rseparate piece 63 (riveted between the outer ends ot the channels forming the member), with much of its depth above the lower edge Vflanges ot the traclrway sides l5, and with an upturned loot 6e abutting against the web oit the outer trackivay Amember just above the lower i'lange oit the latter.

Referring. now, to Figs. 1 to 5 and 11 to 13, it will be observed that each trackway.

l1 is provided with a separate ramp shoe 20. and that each such ramp shoe is moimted to/swing vertically about ai transverse horizontal pivot or pivots 65, mounted in boxnected to said cranks 68 by pivoted links 71..

As, shown, these parts y68, 69, 71 arer housed within the brackets 66, at the inner sides of the'channelv members 15. The interconnected members 69 and 71 have cooperatingl abutment or stop shoulders 72, Jfor limiting the motion of the'parts one way to a. position in which the link pivots are in one straight line with the sha-*ft 67,-or alittle beyond. The adjacent ends of the two shafts 67 may be providedwith readily removable operating levers 73, in convenient proximity for concurrent manipulation by a man standing between them.

Vhen a truck, is to drive on or oil the turntable, the shoes 20 lie flat on the ground as shown in Figs. 3 to 5 and 11, and the toggles formed by thev members 69, 71 are in their straightened position, and perfectly stable against any movement ot the shoes 2O relative to the table structure 15. Hence the shoes 2O afford the ramp end 1S of the table firm.` and unyielding support againsttipping under the weight of' a truck, besides being themselves unaffected in any way by the truck as the latter drives overy them to mount the ramp end 18.

Vhen the truck is properly placed on the table and the latter is to be'swung, the operator raises the levers 7 3 to the point shown in Fig. 12, thus lifting the ramp shoes 2O till the links 71 are straight with the cranks 68.

. Thereupon the operator pulls or pushes the shoes 20 up a little higher, past dead center. till downward movement of the levers 73 willact to swing them on up into the erect position shown in Fig. 13. In this position, the parts are substantially balanced and will not fall. It the shoes 20 are so massive that in order to counterbalance them in the position of Fig. 12 the levers 73 would have to be inconveniently heavy and cumbersome, swinging gravity-actuated pivoted catches 7i such as shown in Fig. 12 may be provided. to snap under the shoes 2O when they reach the position oi Fig. 12 and keep them troni falling.

Thereupon, the operator can swing the turntable as desired (by the levers 73) utter which he pushes the shoes 2O down again into the position shown in Fig. 11. ln case the earth is a little high where a shoe 2O strikes it, the operator can finally.v push down on the levers 73, and thus exert great pressure to Yforce the shoes down `to final position.

Cfr

llO

This description of the operation presup# poses, of course, that the supporting shoe 22 of the elevated table end 17 is correspondingly manipulated,-if used at all, As shown in Figs. 3 and 4, the device 22 comprises a ground plate attached (at its ends) to the free ends of a couple of lever,v arms 75 fulcrumed at 76 on the adjacent sides of the inner trackway side members verse operating shaft 77 extends clear across from side to side of the table structure adja ycent the end member 49, and is'provided with crank arms 78, which are connected by pivoted links7 9 of slightly bent form) with the shoe arms 75. As shown, the intercon! nected members 78v and 79 have'cooperating abutment or stop shoulders`81, corresponding in function to tlievshoulders/ 72 of the parts 69 and 7l. Either or both ends of the operating shaft 77 (outside the outermost trackway side members 45) may be provided with readily removable operating .levers 83,-.-similar to the levers 7 3, and here shown as square socketed to fit the squared ends of the shaft 77. If desired, of course, the table 15 can be swungby one or both of the leversIk 83 as push bars, after the shoe 22has-been released from firm. engagement with the ground. y f

When the parts are in the positions sho-wn in Fig. 4, the toggle7 formed by the membersl 78 and 79 isextendedrpast dead center, and hence kstable and uncollapsible under anysload on the table, so that the device 20 affords the table firm, unyieldingsupport against tipping. swung over about 1800,-till the cranks 78 point upward, and the bends of the links 79 strike and rest againstthe shaft 77 ,-4 the shoe 22 is lifted between the trackways 44, where it does not aifectV the yclearance room under the table .end 18 at all.

illustrated is not only convenient and effective in use, but also easyy and convenient to assemble or take apart quickly, and to transport from one job to another. For by` sim-` tatable table structure swingable over the road edge and itself .serving as ramofnr vehicles mounting or leaving it.

2, A roadway turntablecomprising a rotatable table structure swingable over the road edge, and itself serving asramp jfor vehicles mounting it;y and means carried by said table structure for engaging thelground to prevent Overtppng of said structure byA A transu ,When the, lever, 83 is v a mounting vehicle driven thereupon beyond fb-alancingposition. y

8LA turntable comprising a rotatable table structure swingable over a road edgevand having its ends of unequal length to accommodate a full loaded truck of capacity siz balanced y on the table. l 4. A roadway turntable comprising a rotatable table structure with ends of unequal length to accommodate a full loaded ruck of capacity size balanced on the `table, theshort end serving as ramp. for ve hiclesv mounting the table, and the longend swinging over the road edge.L

`5. A roadway turntable comprising a rotatabley table structure with ends of unequal length to accommodate a full loaded truck of capacityv size balanced on the table, the short kend serving yas ramp for vehicles mounting thetable, and the long end swinging over the road edge and 'means carried by saidy long end for engaging the ground and preventing said long end from tipping kdown on the ground under the weight of a mounting vehicle driven vupon the table structure beyond balancing position, said means being adjustable to permit the table to swing freely, Y

6. A roadway turntable comprising a rou tatable table structure swingable over the road edge, land itself serving' as ramp for ver'hiclesmounting it, and means comprising a ground shoe 'at one endv of the table structure `for preventing tipping ydown of such end on the ground by a vehicle driven on the tablefrom the other end beyond balancing positiom' and means for elevating such shoe from ground engaging position comprising a lever adapted to serve as a push bar for swinging the table.

7. A turntable comprising. avrotatable tav blekstructure with one end elevated to swing lt will be observed that the turntable herek over a road edge and of length to accomymodate a full loaded truck of capacity size balanced on the table facing such end, and the other end sloping downward as a ramp aid of length to swing within the other road e ge.

8. A lturntablecomprising a rotatable table structure with one end elevated to swing "over a road edge andof length to accommodate a full loaded truck .of capacity size balanced on the table facing such end, and the other end sloping downward as a ramp and of length to swing within the other road edge; `and ymeans carriedby the table ends for engaging the ground to prevent tipping vof the table by'a vehicle` such means being shiftable to permit the table to swing freely.

9, A turntable lcomprising abase adapted to be placed in. one side of a roadway, and l of `such relatively narrow width as not to interfere with passage of vehicles in the other side ofthe roadwaygand ar rotatable table structure supported by said vbaseA toswing over the road edge, itself serving as ramp tor lvehicles mounting ,or leaving it 'and of length to accommodate la tull loaded truck balanced thereon so as not to tip the table structure even when the latter 'is turned crosswise of the roadway.

10. A turntable comprising a base adapted. to bel placed ,in one` side ot ya roadway; and a rotatable ytable structure on said base leaving room for passage o`t vehicles inthe .other side of the roadway when turned to extend lengthwise .of ,the latter, and having one end elevated to swing over aroad 'edge and ot-length greater 'than the other to accommodate va full 'loaded truck of capacity `,size balanced onthef'table facing such lend.

1l. A turntable colrlprisingabae adapted .tobe placed in one side `of ja roadway and a rotatable tablestrncture `on saidbaseleavroom for 'passage of vehicles in [the 4other side ,of the Vroadway vwhen turned to eiitendlengthwise ot the latter, one end of said structure being` elevated to swing over a road ,edge and of'leng't to Vaccominodate a full loaded trll'kof capacity size -`balanced 101,1 the 'table tacing such end, and y,the Iother end sloping downward as a ramp and'being of length to swing ,within -the other road edge.

12. A Iturntable for road vehicles com-A prising a'turning track; supporting structure overlying saidftrack and Aoverhanging therefrom, including transverse supporting members `outside the track; a :stationary base with supporting means for said turning tracl; over-hanging'trac-kwavs `for the vehicle wheels overlying and supported by said transverse nienifbe-rs beside 'the portion of said supporting vstru'iture overlying the track, sloping downward `as rampsat one end, and at the etheriele'va-.ted to swing `over a road edge and ,of length to accommodate a full loaded truck .ot capacity size balanced :thereon facing such end.

13. A turntable 'tor road vehicles couiprisiug a statioi-lary hase )with supporting track; a rotatable table structure with turningtrack; and a circ-uni' series .ot peripherally rounded anti-friction rollers interposed between said tracks. held .definitely spaced apart .circumferentiallv, but `Free tor independent vertical sell to ,one another.

14;. `A tinntable for road vehicles comljustment relatively .prising a .station ry'base with supporting tracka rotatabletable structure with turning track; and an anti-friction roller ,assenr bly comprising-spoke-aXles, a circular series ot rollers interposed between yid tracks, and a notchedbaiulengaging said 4axles and spacing 'them apart circumfere'ntially while permitting 'them independent `freedom of vertical `self-adj,itstment, ,and 1also preventing radial displacement `of lthe rollers.

"15. Amturnlblewfo'r 'road 'vehicles commovement of the ramp means when the lat ter is in ground engaging position.

.17. A roadway turntable comprising a sled base, a supporting structure rotatable on said base; and trackways for the vehicle wheels resting on said supporting structure, swingable, by its rotation, over a road edge, and themselves serving as ramps for vehicles mounting or'lyeaving the turntable.

18. A roadway turntable comprising a base, a supporting frame rotatable on said base and trackways for the vehicle wheels beside said frame, with supporting means for said trackways carried by said frame and extending from either side thereof beneath the trackways.

l19. A revolving turntable for road vehicles comprising trackways 'for the .vehicle wheels, transverseA supporting` members eX- tending beneath said trac-kways, aturning Atrack between said members, and structure overlying said ,track connected thereto and tosaid members for transmitting the load of the trackways from the latter to the former.

20. A revolving turntable tor road vehicles comprising a revolving turning track, a supporting Aframe structure mounted on and overlying said track, and separate trackways for the vehicle wheels detachably secured beside said 'trame structure at either sideA thereof.

21. A roadway turntable con'iprising a re'- volving .turning track, a 'trame structure mounted on and overlying said turning track, and trackways for the vehicle wheels resting on said turning` track beside said frame structure.

22. A revolving turntable tor road vehicles comprising trackways for the vehicle wheels` a turning track a supporting frame overlying said track` and transverse supporting members for said trackways subjavcent the same and said trame supported b v the latter.

23. A revolving turntable for road vehicles comprising a turning track; a support ing iframe structure mounted on and overlying said track, with transverse `supportingmembers extending to either side there from; ,andA 'separate trackways for the vehicle wheels'atfeither side of said frame structure, with 'inner lateral strength'members resting on said transverse supporting members, and outer side members secured to the ends of said transverse members. f

24C. A revolving turntable for road vehi- Cles comprising trackways for the vehicle Wheels, with inner and outerlateral strength members; transverse supporting members for the trackvvays secured` to said strength members; a turning track between said transverse members; and a frame mounted on and overlying said track, with members overhanging and supporting said transverse members. s f

In testimony whereof, I have hereunto signed my name.

WILLIAM M. vENABLn.

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