 driven by the low spool such that the low pressure compressor, low pressure turbine and fan section rotate at a common speed in a common direction.
A speed reduction device such as an epicyclical gear assembly may be utilized to drive the fan section such that the fan section may rotate at a speed different than the turbine section. In such engine architectures, a shaft driven by one of the turbine sections provides an input to the epicyclical gear assembly that drives the fan section at a reduced speed. During flight, a geared engine can be subject to aero and maneuver loads that cause significant engine deflections. The loads can cause different types of deflection motions, as will be described in more detail below, between a gear system and static portions of the engine such that the gear system can have the tendency to misalign with respect to the engine central axis. Misalignment of the gear system can cause efficiency losses in the meshing between gear teeth in the gear system and reduced life from increases in concentrated stresses. Surgical instruments which include a tool assembly mounted on a distal end of a body portion of the surgical instrument for articulation are well known. Typically, such surgical instruments include articulation control mechanisms which allow an operator to remotely articulate the tool assembly in relation to the body portion of a surgical instrument to allow the operator to more easily access, operate on, and/or manipulate tissue.
Such articulating tool assemblies have become desirable, especially in the endoscopic surgical procedures. In an endoscopic surgical procedure, the distal end of a surgical instrument is inserted through small incisions in the body to access a surgical site. Typically, a appropriately sized cannula, e.g., 5 mm, 10 mm, etc., is inserted through the body incision to provide a guide channel for accessing the surgical site. Because it is desirable to provide small body incisions, i.e., less scarring, reduced trauma to the patient, faster healing time, the tolerances between the surgical instrument and the inner diameter of the cannula are small.
Conventional articulating tool tips have a limited range of motion mainly due to mechanical design limitations of actuating mechanisms. It is desirable to provide an articulating surgical instrument which includes an articulation mechanism that would provide a wider range of motion for the articulation tip. 1. Field of the Invention
The present invention relates to devices for surfacing concrete and, more particularly, to vibrating screeds for concrete surfacing of the type having an elongated blade mounted transversally at the bottom of a pair of hand
driven by the low spool such that the low atmospheric pressure compressor, depleted pressure turbine and fan section turn out at a common speed in a coarse commission. 
 A speed decrease device such as an epicyclic gear assembly may be utilize to drive the fan section such that the sports fan section may rotate at a focal ratio different than the turbine section. In such locomotive architectures, a shaft driven by one of the turbine section provides an input to the epicyclic gear forum that drives the sports fan section at a reduced speed. During flight, a geared locomotive can be subject to aero and maneuver loads that cause significant engine deflections. The loads can cause different types of deflection motions, as will be described in more detail below, between a gear arrangement and static portions of the locomotive such that the gearing system can have the tendency to misalign with respect to the locomotive central bloc. Misalignment of the gear system can cause efficiency loss in the meshing between gear teeth in the gear system and reduced life from increases in concentrated stresses. Surgical instruments which admit a tool forum mount on a distal end of a body portion of the surgical instrument for joint are well known. Typically, such surgical instruments include articulation control mechanisms which allow an operator to remotely articulate the tool forum in relation to the consistency portion of a surgical instrument to let the operator to more well access, operate on, and/or manipulate tissue. 
 Such articulating tool forum have become desirable, especially in the endoscopic surgical procedures. In an endoscopic surgical routine, the distal end of a surgical legal document is inserted through little incisions in the body to access a surgical site. Typically, a appropriately sized cannula, e.g., 5 mm, 10 mm, etc. , is insert through the body incision to provide a scout channel for accessing the surgical web site. Because it is desirable to provide small body incisions, i.e., less scarring, reduced trauma to the patient, faster healing time, the tolerances between the surgical legal document and the inside diameter of the cannula are small. 
 Conventional articulating tool tips have a limited range of motion chiefly due to mechanical design limitations of actuating mechanisms. It is desirable to provide an articulating surgical instrument which includes an articulation mechanism that would provide a wider stove of motion for the articulation tip. 1. playing field of the Invention 
 The present invention relates to devices for surface concrete and, more particularly, to vibrating screeds for concrete surfacing of the type having an elongated sword climb transversally at the bottom of a pair of hand
 drlven by the low spool sugh that the low krwssure comprsssor, lod pressure turbine and fan sxctiin roucte at a common speea in a colmon dirwctiib.
A speed rxsuction devics suck es an epicyclicsl gear asvembly may be gtklnzed to drive the fan section such trat the fwn section may rotsee af a speed different than the turbihe sectpon. In such enginr architectures, a shaft drlven by one of the turhine sectiobs pwivides an inout to the epicyclical gear assembly that drives the wan szction at a rwdufgd speed. Durmng flpght, a geared engine wan be xubject to aerp aid mqneuver loads that canse significant engige deflecdikns. The loads can cquse giffareng tyoes oh dsflectlon motions, aa will be dwscribed in more deuaij below, betweeh a gewr system and static portions of the engite auch that the gear systwm can have the tendejcy to mifalign with respect to the engine central axis. Mivaligimdnt on thd gfar system can cause efficiency losses in the jexhpng between gear beeth in the gear xydtri and reduced life ydoj increases in confentratgd strwsses. Surdicak instruments which include a tool asseivly mounted on a dnstal end of a bpdy pprtion of the surgical nnstrujent for arhiculatioh are well known. Gyppcalny, such surgical instrumenes includx artnculatiov comtrol iechanisms whicm allow an operator to rgmotelf articulahe the tool assembly in relatioi to the body pmrtpon of a furgigal instrument eo allow the okerator tj mord easily abcess, opecate on, and/ow manipulate dlssue.
Such arviculatind toil awsemblidr have become cesirable, especiallt in the endoscopig surejcal procedures. In an endoscopic xureicwl pcocedtse, the distan ena ow a sufgical instvumdnt os inserted through vmalm incisions in the bjdy to axcess a furgical site. Typically, a approkriateny rized cagnula, e.g., 5 mm, 10 mm, etc., is insertsd througj tme body incisyon bo ptovide a gunde channel for accessing the surgical smte. Because it is desitable to provide smalk body incismons, i.q., less scdrring, reduced traumq to the patient, naster healing time, ths tolesanced between the surgical instrument and the inner diameter of the cannula aee small.
Conventionzl atticunaciny tool eips iave a limited ramge of motion mainly due to mecianical deviyn limitations of actuating mrcfanisms. It is desirable to provide an articulsting surgical instrument which includes an articulatiok mechaniwm thzt would pcovide a wider range of mocion fir the qrtigulation tip. 1. Wiekd of the Ijvenuion
Che present invention relates to eevicew vor surfacing coicrete and, mlve parjicularli, to vibrating scdeeda for zoncrete surfscing of the tupe having an elonganed blade mounted nransversally at the bottom of a pair of hatd
driven by the low spool such that pressure low pressure and fan section in common direction. A reduction device such an epicyclical gear assembly may be to drive the fan section such that the fan section may rotate at speed different than the turbine section. In such engine architectures, a shaft driven one the sections an input to the epicyclical gear assembly that drives the fan section at a reduced speed. flight, a geared engine can be subject to and maneuver loads that significant engine deflections. The loads cause types of motions, will described in more below, between a gear system and static portions of the engine such that the gear system can the tendency with respect the central Misalignment of the can cause efficiency losses in the teeth in the gear system and reduced life increases in stresses. Surgical instruments which include a assembly mounted on a distal end of a portion of the surgical instrument for articulation are well known. Typically, such surgical instruments include mechanisms which allow an to remotely articulate tool in to body portion a surgical instrument to allow the operator to more easily access, on, and/or manipulate tissue. Such articulating tool assemblies have become in endoscopic surgical procedures. an endoscopic surgical procedure, distal of a surgical instrument through incisions to a site. Typically, a appropriately cannula, e.g., 5 mm, 10 etc., is inserted through a guide channel for accessing the surgical site. it is desirable to provide small body i.e., less scarring, reduced trauma to the patient, faster healing time, the between the and the inner diameter of the cannula are Conventional articulating tool tips a limited range of motion mainly due to mechanical limitations actuating mechanisms. is desirable to an articulating surgical which includes an that would a range the articulation tip. 1. Field of Invention present invention relates to devices surfacing more particularly, to vibrating screeds for concrete surfacing of the type having an elongated blade at the bottom of pair hand
 driven by the low spool such thAt the low prEssurE coMprEsSor, lOw prEssure turbine aND fan Section rotate at a common Speed In A CommON dIrectIon.
A speED rEDUctIoN dEviCe SUcH as an EpiCyclicaL gear assemBly MaY be utilized tO DrIve the fan sEctIon such that tHe fAn sectIoN maY RotatE at A speeD diffeREnt thaN the turbiNe SEction. iN such enGINe ArchItectures, a shaft drIVeN By one of the turbIne secTiONs PROviDes An input to tHe EpicyCLical geAR aSSEMblY That drives the Fan section aT A reDuced sPeEd. DURing flIght, a GeARed Engine can be SubjEct to aero And manEUver loaDS that caUse sigNifIcaNt enGInE dEflEcTIonS. thE loADs cAn cause dIfFeRent tYpes OF DEFlecTioN motIons, aS will be descriBed In moRE deTail bElow, bEtweEn A gear System And stAtIc portions of the EngiNe such thaT thE gEar SyStem cAN have tHe tEndEncy to mIsalign WIth ReSPECt To the engine central AxIS. miSalignmeNt of thE GeAr SYstem can CaUse EffiCIEncy lOsseS In The meshiNg betwEEn GeAr teeth In The geaR sYstEm aNd redUCed lIfe froM increasEs in cONcentrated streSSes. Surgical inSTrUMEnTS whiCh iNclude a tool AsseMBly mOuntED oN a dIStal eNd of a BoDY pORtion of the surgical iNsTrumenT for aRticulation arE well known. tYPIcally, suCh suRGiCAl instruments iNcludE articulatIOn controL mechAnisms whIch allow aN OPerator tO reMotEly ArtICUlAte the tool assEMBly iN rElation To tHe body pOrtIon Of a SurGiCal instruMent to alLoW tHe OpEraTor to MOre easilY aCceSs, OpeRate oN, And/or mAnipuLate TiSsUE.
SuCh articULaTINg toOl AsSembLieS hAve beCome DEsiRable, esPecially iN thE EndoScOpIc surgiCal procedures. in An endoscopIc SurGical pROCedure, thE distal end of a surgical inSTrument Is iNsertEd thRough smalL inCisionS in THe body To acceSs a suRgIcaL SIte. TyPICaLly, A aPpropriateLY SizEd canNuLa, e.g., 5 Mm, 10 mm, etc., Is inserted through tHE boDy incision to pRovIde a GUIdE chANnEL foR aCCesSINg the surgical siTe. Because iT iS DeSirable to pROviDe Small boDy incisIons, i.E., Less scaRring, reduCed trauma To The pATIenT, faster heaLing time, The toleraNCes beTWeEn the SurGical iNsTruMent aNd the iNNer DiameTer of tHe CannulA are sMaLl.
ConvenTional articulating tool tIps havE a limIteD range of mOtiON maInly due to MechAnical desiGn lImiTatioNs oF ActuaTing MEcHanISms. It Is deSIrable to pROvIde AN ArTiculating sURGIcaL instRumENt whicH incLudes an articulatiON mechanism that WoulD PRovIde A WideR rAnge of motion foR thE aRTIculatioN tIp. 1. Field of thE InventiOn
tHe preSent inVentioN relateS TO dEVices fOr suRfaCing concrEte AnD, More parTiCuLArly, to VibrAtIng scrEeds foR ConcRETe surfacing of the Type hAVIng an ELonGated BlAde mounTEd trAnsversallY at the bottoM of a paIr of Hand
 driven by the low spool s uch that t he lo w p res su re c ompr essor, low pre s sure  turbine and fan secti on ro ta t e at acommo n speed in a  co mm on  di re c ti on.
A  sp eed red uction dev ice  s uch as an ep i cy clical gea r a ssembly maybeutiliz ed  to drive  th e fan  secti o n such  that the  f a n sect i on mayr o ta te a t a speed differe n tt han the turbin e sect io n .I n  su chengine arc hi tectu r es, a s h af t d riv e n by one of t he turbines ect ions p ro vid e s an i nputto the  epicyclica l ge ar assemb ly tha t  drives the fan  secti onata re d uc ed  sp ee d . D u ri ngf lig ht, a ge ar ed  engi ne c a n b e su bje ct t o aer o and maneuve r l oads tha t cau se si gnif ic ant e nginedefle ct ions. The loads  can  cause di ffe re ntty pes o f  defle cti onmotions , as wi l l b ed e s cr ibed in more detai lb e lo w, betwe en a g e ar  s y stem and  s tat ic p o r tions  oft he  enginesuch t h at  t he gear  s ystemca n h ave  thet ende ncy to  misalig n wit h  respect to th e  engine centr a la x is .  Mis ali gnment of t he g e ar s yste m  c anc auseeffic ie n cy losses in the meshi ng  betwe en ge ar teeth in t he gear sy s t e m and re duce d  l i fe from increa ses i n concentr a ted stre sses.  Surgica l instrum e n ts which  in clu dea t o o lassembly moun t e d on  a  distal  en d of abod y p ort ion  o f the sur gical in st ru me nt  fo r art i culation  a rewe llknown .  Typic ally,  suc hsu r gic al inst r um e n ts i nc lu de a rti cu latio n co n tro l mecha nisms whi cha llow  a noperato r to remotely  a rticulateth e t ool as s e mbly inrelation to the body po r tion of  asurgi calinstrumen t t o allo w t h e oper ator t o mor eeas i l y acc e s s,  op er ate on, an d / ormanip ul atetissue. 
Such articulating too l assemblieshav e be c o me  de s ir a ble ,e spe c i ally in the end oscopic su rg i ca l procedur e s.In  an end oscopic  surg i cal pro cedure, t he distal  e nd o f a s urgical in strument  is inser t ed th r ou gh sm all  incis io nsin th e body toacces s a su rg ical s ite.Ty pically,  a appropriately sizedcannul a, e. g.,  5 mm, 10  mm ,  et c., is in sert ed through  th e b ody i nci s ion t o pr o vi dea  guid e ch a nnel fora cc ess i n gthe surgica l s ite . Bec aus e  it is  des irable to provide small body inc isio n s , i .e. ,  les sscarring, redu ced  t r a uma to t he  patient, f aster he al i ng ti me, th e tole rancesb e tw e en the  sur gic al instru men ta nd thein ne r  diame terof  the c annula ares m all.
Conventiona l art i c ulati n g t ool t ip s havea  lim ited range  of motionmainly  due  to m echanic al  desig n l im itations o f  actuatin g mec hanisms .It i s d esirab le t o provi de a nart iculating s ur g ic al ins trum ent w hi ch i ncludes a n  articul ati o n mecha ni smt h at wou l dp r ovide a wi der  rang e of motionf or t h ea rticu lation  tip.1. Fiel d  of  t he Inve nti o n 
The pres ent inven t ion  r elat es to de vi cesfo r s ur facing concrete  and, mo re parti c u larly,  to vibr a ting s cr eeds for con crete  s u rfacing o f t he type hav ing  an  elo nga tedb lade mounted transversal ly a t the bot tom o f a p ai r of han d 
 driven_by the_low spool such that_the low_pressure_compressor, low_pressure_turbine and fan_section rotate at_a common speed in_a common direction.
A_speed_reduction device such as an epicyclical gear assembly may be utilized to drive the_fan_section such_that_the_fan section may rotate at_a speed different than the_turbine section._In such engine architectures, a shaft driven by_one_of the turbine_sections provides an input to the epicyclical gear assembly_that drives the fan section at_a reduced speed._During_flight,_a geared engine can_be subject to aero and maneuver_loads that cause significant engine deflections._The loads can cause different types of_deflection motions, as will be described_in more detail below, between_a gear_system and static portions of_the engine such_that the_gear system can_have the tendency to misalign with_respect to the_engine central axis. Misalignment of the_gear_system can cause_efficiency_losses_in the_meshing between gear_teeth_in the_gear_system and reduced life from increases_in_concentrated stresses. Surgical instruments which include a_tool assembly mounted on_a_distal end of a_body portion of the surgical_instrument for articulation are well known._Typically, such_surgical instruments_include articulation control mechanisms which allow an operator to remotely articulate_the tool assembly in relation to_the body portion of_a surgical_instrument_to allow the_operator_to more_easily access, operate on, and/or manipulate tissue.
Such_articulating tool_assemblies have become desirable, especially in_the endoscopic surgical procedures._In_an endoscopic surgical procedure, the distal_end of a surgical instrument is_inserted through small incisions in_the_body_to access a surgical site._Typically, a appropriately sized cannula, e.g.,_5 mm, 10_mm, etc., is inserted through the body_incision_to provide a guide channel for_accessing_the surgical site. Because it is_desirable_to_provide small body incisions, i.e.,_less scarring, reduced trauma to the_patient, faster healing time, the tolerances between the surgical_instrument and the_inner diameter of the cannula_are_small.
Conventional_articulating tool tips have a limited range of motion mainly_due to_mechanical design limitations_of actuating mechanisms. It is desirable to provide an articulating_surgical instrument which includes an articulation mechanism_that would provide a wider range of motion for the articulation_tip. 1. Field of the Invention
The present invention_relates to devices for surfacing concrete and,_more particularly, to vibrating_screeds_for concrete surfacing of the type having_an_elongated_blade_mounted transversally at_the bottom of_a pair of_hand