US2482562A

US2482562A - Vertical lift bridge

Info

Publication number: US2482562A
Application number: US595158A
Authority: US
Inventors: Bank Security-First National
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-05-22
Filing date: 1945-05-22
Publication date: 1949-09-20
Anticipated expiration: 1966-09-20

Description

L. H. SHOEMAKER VERTICAL LIFT BRIDGE Sept. 20, 1949,

5 Sheets-Sheet 1 Filed May 22, 1945 m N V! .2 mw mm H M 5 iw m w Sept. 20, 1949. H. SHOEMAKER v I 2,482,562

' v VERTICAL LIFT BRIDGE I Filed May 22, 1945 4 s Shee ts-Sheet s ,gH N

a H R I 2 2 INVENTOR. N lows M imam r52,

By fiiMVh 44kg,

Arroemsvs.

Sept. 20, 1949. H. SHOEMAKER 2,482,562

VERTICAL LI'FT BRIDGE Eiled May 22, 1945 5 Sheets-Sheet 4 Jim. 6.

INVENTOR. Leas/i .Saozflmrze,

Arroe'lvsys.

P 20, 1949- I. L. H. SHCIDEMAKER 2,482,562

VERTICAL LIFT BRIDGE Filed May 22, 1945 5 Sheeis-Sheet 5 INVENTOR. Zea/s M 5HOEMAKER,

Arne/vars.

- the span side of the weightto be lifted by, the winding engines, whereguarded against. A feature .of .my invention, for the varying load caused by tion of the lifting span is travel between them of auxiliary counterweight chain. The upperpor cable in the tower.- of the cable of the auxiliary counterweight passes the vertically arranged sheaves, the upper sheave 1'.

see- 9st.

cables 32,.fbr the counterand therefore. theirweight is. very considerable. =In the.lowered position of the span the weight of the cablesis carried on towers, thereby increasing the as in :the raised position of-the; span the weight wofthe cablesis suspended from the counterweight :sheave on the opposite side, thereby. decreasing l-the weigh t to be, lifted.

fective weight of the counterweight tends tocause- @T c ea fi the .e

increasingly rapid lifting of the span unless s to compensate the counterweight cables y the provision of a short length ofcnain :55, serving as an auxiliary counterweight, which,

instead of being lowered between. extreme high 1 and low positionsof the. counterweight as in known constructions, 1- fourth this distance andis movedthrough only onein fully raised position. The construction and operation of the auxiliary counterweights is shown in Figs, ;11, 12, 13 and 14. The weight of chain 55 is nearly. as-possible equal to the total weightof over the sheaves from the lifting span. The chain is attached to a top member of the lifting span bymeans ofa cabletfi passing over a sheave 51 supported on the towers and over a secondsheave 58 enabling the chain to hangdoyvnwardly with the bottom link supported onanabutment 59 arranged at a pointone-quarter of the distance traveled by the main counterweightv b tween its raised position and its lowered DOSition. I

At a point exactly midway of the travel of the lifting span of the, bridge two sheavesGO, 6| are arranged in vertical relation and arespaced apart .as closely as is possible while permitting the cable supporting-the tion of the vertical run of the chain supporting cable passes around thetower side of. the upper sheave, then passes between the sheaves, and continues over the oppositeside. of the lower sheave. to its point of connection to the, liftingspan; The result of this arrangement is that during the raising of the lifting span,,the-top of the chain is lowered, thus continuously reducing the weight of the chain suspended. by the cable as more and more of the chain is suspended from the abutment, until the point of attachment of. the chain to the lifting span reaches the level at which the cable passes between the vertically arranged sheaves, at which time the weight of the auxiliary chain counterweight is wholly suspended from the abutment exactly compensating for the increased weight. of the counterweight As the point of attachment acts to transmit a pull .to the cable which acts against the lifting power and again raises the end of the chain or auxiliary'counterweight so weight added to the counterweight byzthe counterweight cables is counterbalanced at. all times.

To provide a chain which .will function satisfactorily I construct it. -of 1a iplural-ityofshrt:

at the fully raised posicrosssection of relatively the'sockts of a higher tier.;

,thelpwest link is connectedto spacing members .1168 pivoted in bearings I on the abutmentii! and length. of chain clear ofthe it may be lowered, by cable act irie ol th abutment so that .59. link by link until whollysupported onthe abutment.

- -A'stillfurther feature of the -invention is the pr o vision of novel attachingmeans for the ends .ofthe cables. .It has previously ,been necessary to spread the ends ofa set of cables r-aising hea vy .1oads.;o.v rsbeay sa d th e m ed 111;...-

somewhat cumbersome arrangement of anchoring me s; lli rd r to m z l nace-i th a choring of a number of cable ends, I ,arrangethe cable endsin sockets 10 (Figs. '7 and 8) of square I smallsize and provide utments forth so ts a r ed inve tical tiers, the cables: attached to a tier passing between By this meansa ;la rge number of cable ends can be secured ,to a smaller area of anchor plate and occupy a smaller yolumethan has been possible by previous practice. ,7 V

Breferably the socketsare provided-:with eyes ma. Apin may be passed through two opposite eyes and the end of a lever, fulcrumed against the. structure, may b passed over the pin,- a hydraulic jack being used bearing against the free end of the lever to stress the cables totheir proper load, anyslack being tak n up by. shims inserted between the sockets and their abutment.. Figs. '7 and 8 show the connection of thecounterweight cablesjz to the counterweights ifl which are formed about a structural frameato whichu'vlengthsgofvangle material 12 are riveted and which project from the upper surface of the counterweight toward each end thereof. Plates 13 aresecured to the flanges of the angle'material and to a heavy strap 14 extending vertically, from the, outside edge of the counterweight and secured to its structure and lengths of I beam-.15 are arranged to extend between the plates 13 and .are secured thereto by angles. Plates 16 of heavy gauge are welded to the lower surface of the bottom flange of the I beams to provide abutments for the upper surfaces of the square'sockets 10. The cables 32 are positioned in slots formed in the plates and I beams. Sixteen cable ends are .shown arranged intwo tiers with half the cable ends .on one side of the webbs of the I beams and half on the opposite sides It will .be noted that the construction described provides a very coinpact cable end anchoring assembly.

Figs. 9 and 10 show the right handhalf ofan 'arrangement for connecting the counterweight cable ends to the end of the lifting span. .AnI beam is arranged to extend across the ends of ;-the span-superstructure to which it is secured, and special castings 82 are bolted tothe front and back of the webb at each side of the bridge. The casting 82 is formed to provide channels for the cables and flanges against which .bear the square section cable end fittings. The cable ends ateach side of the bridge are arranged inrtiers rand to the back and front of the carrying beam as in the construction shownin Figs. 7 and 8;

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it-vlllbe-evident that r aatesrevmasvemcal lifting span bridge in which the lifting and operating means are simple, effective; and economical to construc't and operate; however, varisaid towers at each side thereof; bearing mem bers for said sheaves, one of said bearing members at each side being in the plane of a side of the tower and near a vertical colu'hin thereof; horizontal longitudinally extending tower bracmg members reduced in width in a part-oi" their length; additional horizontalinternal towerbrac- 'lng inemberscompensatin'g for the "reduced width of said longitudinally extending members; diagonally arranged tower cross bracing members arranged on the exterior of said tower-7 a counterweight extending across substantially the full Width of the tower interior in the space provided by the reduction'in width of thelongitudinally extending bracing members; cables secured to said counterweight passed-over said sheaves and secured to said lifting span; lifting oable means scoured atone end to the idler tower; lowering cable means secured at one end to the idler tower; sheavos mounted onthe vertical lift span around which the lifting and lowering cable means-are passed; cable winding means located oflf thelift- .7

mg span adjacent one-end only thereof; sheaves mounted on the operating tower below the level or the sheaves on said lifting span when-said span is in" lowered position and around which=the10wering cables are passed from thelifting spanand led to the winding means, said lifting and loweringr cables being secured to said winding-means so that operation of said winding means acts, according to the direction of rotation thereof, to raise or lower said span.

4 2. A vertical lifting span bridge including: an

operating tower; an idler tower; a-verticallift span arranged forupward and downward movement' between said towers; sheaves mounted on said towers; bearing members for said sheaiies, 5

one of said bearing'members at each sidebeing in the plane of aside of the tower and near a ver-- ti'c'al column thereof; horizontal longitudinally extending tower bracing members reduced in widthin a part Of their length; additional horizontal internal tower bracingmembers compensating for the reduced width of said longitudinally extending members; diagonally arranged tower cross bracing members arranged on the exterior of said tower; a counterweight extend- 0oing across substantially the full width of the tower interior ln'thospace provlded bythereduction in width" of the longitudinally extending bracing members; and cables secured to said counterweight passed over said sheaves and se- 65 curedto said liftlngspa'n.

BRA vertical lilting span brldgeincludmgi an operating tower; an idler tower; a vertical-hit span arranged tor'upward and downward movemerit-between saldtowers; counterweight sheaves 70- inountedon said towers; cables attached to said lifting span and extending over said sheaves; counterweights suspended in said towers from said cables; auxiliary counterweight sheaves mountad on-sald towers; auxiliary ccdntrwoislit -75 "means: on the auxiliary counterweight: of

' 'lbwrillg 'iiid spam- Sh'eEV'S mounted 81 the lifting span; sheave means mounted onscid operatins tower below the: level or the sheaves on said liftingspan when said span isin lowered position o: the" lifting span; and cable winding incline located on the lifting span adjacent one end only thereof, said cable means being passed 'lrom the points-oi attachment totheidler tower around theslieaves on the lifting span-anderouhd the-sheave means'znomitedonthe ooerating tower therebelowsnd encased with said-winding means, so that operation of said winding means acts. according to" the direction of rotation thereof; to

raise'or lower the lifting-span. 4; A vertical lifting span-bridge including: an operating tower: an" idler tower: a vertical'liit span arranged for upward and downward movemerit"between said towers; counterweight sheaves mounted-on said towers; cables attached to said lifting span and extendingover said-sheaves; ccunterwcishtssuspendedin said towersfrom said cables: auxiliary counterweight sheavesmounted on said" towers; auxiliary counterweight support ing cables running over said auxiliary counter- WelEhUshdiWes and" attached to said lifting span; auxiliary countcl-weights of variable effective Wlght' suspended in said towers from the cables ruhllin'govor said-auxiliarycounterweight sheaves and: comprislng a plurality of connected bodies;

5 means-tor cnangirie'the direction of movement of the auxiliary counterweight: supporting cables fdiiringohe-hnlfoftheiipward or downward movements! said span; means tovary the weight of said auxiliar counterweight acting throughits supportmgcableunsold-liftingspan; cable means attached to-the idler tower for'raisins and lowermg 551d span; sheaves mounted on the lifting span; sheuvo means mounted on said operating tower bolbwthelevl or the sheaves on said liftin; span when said: span is in lowered posit-ion; and clble winding'means located Off the lifting span sdiccent one end oiilythereoii said cable meansbmng passed from the points of attachmerit to the idler: tower around the sheaves on the lifting shim ahdaround the sheave means mounted on the operating tower therebelcw and engaged-with said winding means, so that operation or said winding mean acts, according "to the direction of rotatio thereof to raise or lowcrthe'liitmg'spam f a. nlv'ertical" liiting span' bridge including: an operating tower; on idler tower; a vertical lift spun amn'gcdior upward and downward movement between-saidtowers; cable means attached wine idler tower" tor raising-and lowering said span; sheavcrmounted-chthelitting span; sheave mounted on said operating tower below trie -level 0t tho siiwvesonsaid lifting span when said spent; in loweredpositicn; cable winding liitiiig" span adjacent one endsonly theneof; said cable meansbeing passed from t-luee' ointsof-attachmeniisto the -;tewen around: the sheaves. andi-sheanecmeans andens-- gaged withsai'dywindingameanssso that operatiomof-said windingmaeans aflfioldlng'ct the.

direetionof.rotationsthereef to raise erlewer the liiting; spam; counterweight: sheavesuonzsaid: tow ers;; main-.counterweighh cables. attached to the.-

lifting span and passing over said; counterweighttive speed of rotation of'said windinganeans; and:

counterweighiisheaves; ta effectv leael-i raisingq oi said vertiealli-ftingspam.

6. A vertiea1-=,1i-fi;ing panihridgesinolndingzfairi operating tnwer:; an'- iQJEF'QtQWBI; a vertical lift span arranged for upward and downward movement betweenofilifting cable means secured at one endto the idler tower for raising each side of'the span; cables means secured at one end to the idler tower for lowering eachsitte dithe span', sheaves mounted on. the vertical lift spanaround which the.- lifting and lowering cable means are-passed; cable winding means located onithefoperatingtower; sheaves mounted on the operating tower below the level. of the sheaves on said lifting spa-n; when said span lowered position-andaroundwhich the lowering cables are passed from the lifting span and led to the cable winding means, said lifting and lowering cables being secured to said winding means so that operation of said winding means acts, according to the direction of rotation thereof, to raise or lower said span; counterweight sheaves on said towers; main counter-- weight cables attached to the lifting span and passing over said counterweight sheaves; main counterweights suspended from said counter weight cables; and means connecting the cable winding means on the operatin tower and the counterweight sheaves thereon to insure a, desired ratio of relative speed of rotation of said winding means and counterweight sheaves to effect level raising of said vertical lifting span.

'7. A vertical lifting span bridge including: an operating tower; an idler tower; a vertical lift span arranged for upward and downward movement between said towers; counterweight sheaves mounted on said towers; cables attached to said lifting span and extending over said sheaves; counterweights suspended in said towers from said cables; auxiliary counterweight sheaves mounted on said towers; auxiliary counterweight supporting cables running over said auxiliary counterweight sheaves and attached to said lifting span; auxiliary counterweights suspended in said towers from the cables running over said auxiliary counterweight sheaves and comprising a plurality of connected bodies for counterbalancing the weight of the counterweight cables; means for changing the direction of movement of the auxiliary counterweight supporting cables during one-half of the upward or downward movement of said span; an abutment arranged on each of the towers to engage with the lowermost of said connected bodies of said auxiliary counterweight; lifting cable means attached to the idler tower for raising and lowering said span; sheaves mounted on the lifting span; sheave means on said operating tower below the level of the sheaves on the lifting span when said span is in lowered position;'cable winding means located on said operating tower; said lift- W- m countera pair of lowering.

operating tower;

ns-z-cahl ea sspa d fro the m nts" of fattachment to: the idler, toweraround the sheaiV-eson;saidliftingspanand said sheave means n; a d ner ms pw r nd nsa ee wi i nd nameana scat:.-on ie o a d w n ing -mea ns;-acts, accqrdingto therdirection of no, tation. thereof,-; to; raise orxlewer the lifting span; n m s camting oni-e-the operatingtowen .andthe counterweight sheaves thereon, to-insureadesired ratio ofrela tivespeediotrotation. ofsaid-winding; means andr counterweightsto efilectilevel raising 0 S d" V- ticallif-tingspani i, J a H i 8;. A- verticalliftingspambridge-including; an, 7 p v an -id ler= tower; ;-a vertical-lift, span arrangedfon. upwarde anda-cdownward -movee mentibetweenisaid towers; cable means attaehedt said lifting sp to the idler tower for tothe idler tower for raising-and-lowering said.

span; sheaves mounted-omthe. lifting span;

; sheave; means mounted on saideoperatingtunnel? below ithalevehof thesheaves-on the lifting. span;

when-said. span is in loweredrposition of therlift-i ingpspan;r cable, operating towen, said cable meansbeingpassed from the' points of-attachmentto thefidler tower around the...sheaves, and sheave means and en.-

gagefi with-said windingfmeans so that operation according to. the.'di,-

of; said winding means acts) rectiongof. rotation thereof; toraisejor. lower the.

i lifting span counterweight. sheayes' on said. tow:

ers; main counterweight" cables attached to'the lifting span and passing over said sheaves; main counterweights suspended from said counterweight cables; shelf-like abutments arranged on and said counterweight; rectangular sockets in which said main counterweight cableends are secured, said rectangular sockets being arranged in close proximity to one another to engage the undersurface of said abutments; and means connecting the cable winding means on the operating tower and the counterweight sheaves thereon to insure a desired ratio of relative speed of rotation of said winding means and counterweight to effect level raising of said vertical lifting span.

9. A vertical lifting span bridge including: an operating tower; an idler tower; a vertical lift span arranged for upward and downward movement between said towers; cable means attached raising and lowering said span; sheaves mounted on the lifting span; sheave means mounted on said operating tower below the level of the sheaves on the lifting span when said span is in lowered position; cable winding means located off the lifting span adjacent one end only thereof, said cable means being passed from the points of attachment to the idler tower around the sheaves and sheave means and engaged with said wind ng means, so that operation of said wind ng means acts, according to the direction of rotation thereof, to raise or lower the lifting span; counterweight sheaves on said towers; main counterweight cables attached to the lifting span and passing over said counterweight sheaves; main counterweights suspended from said counterweight cables; and means for insuring equal rate of movement of the ends of the liftin span comprising a mechanical drive means connecting said cable winding means and said counterweight sheaves. 7

10. In a vertical lifting span bridge, an operating tower; an idler tower; a vertical lift span arranged for upward and downward movement between said towers; counterweight sheaves mounted on said towers; cables attached to said thebable winding means, 7

winding Y means located on the,

lifting spangand extending over said shavesj mounted 'on said towers; auxiliary; counterweight supporting cables running over said auxiliary counterweight sheaves and attached to said span; auxiliary counterweights of variable effective weight suspended in said towersfrom said auxiliary counterweight supporting cables, said auxiliary counterweights each comprising an elongated flexiblemember; means in the towers for supporting said-auxiliary counterweights at the ends thereof opposite to the ends supported by the auxiliary:counterweight supporting cables; and means for changing the directions! movement of the auxiliary counterweight supporting cables during orighalf of the upward or downward movement of said span.

11. A-bridge as defined in claim 10 in which the means for changing the direction of movement of the auxiliary counterweight supporting cables during one-half of theupward or down-,

ward movement of said span comprises a, pair of sheaves for each of said auxiliary counterweight supporting cables mounted on said towers at a point halfway between tlji'd ppermost and lowermost? positions of said span, said auxiliary counterweight supporting cables .rum1ing from said span between said pairs of sheaves to said auxiliary counterweight sheaves. i

12. In a vertical lifting span bridge, an operating tower; an idler tower; a vertical lift span arranged for upward and downward movement between said towers; counterweight sheaves on said towers; counterweight cables passing over said sheaves and attached to the lifting span; counterweight suspended in said towers from said counterewight cables; cable and sheave means mounted on said towers and said lifting span for eifecting raising and lowering of said span; and means for insuring equal rate of movement of the ends of the lifting span comprising a driving connection between said cable and sheave means for raising and-lowering the span and said counterweight sheaves for driving said counterweight sheaves at a desired speed of rotation relative to the speed of said sheave and cable means.

LOUIS H. SHOEMAKER.

REFERENCES CITED The following references are of record in the,

file of this patent: I

UNITEDSTA'I'ES PATENTS