 as to restrain the occupant. The buckle is mounted on a suitable position near the floor so that the webbing fits the occupant's body well.
Conventionally, the seat belt apparatus locks the webbing from withdrawing by the function of ELR at a crash to restrain the occupant from a forward movement.
For improvement in the efficiency of restraining the occupant, each of U.S. Pat. Nos..[.3,841,645.]..Iadd.3,841,654.Iaddend., 3,865,398 and 3,866,940 discloses a seat belt apparatus in which the webbing has a portion formed in an envelope shape made of a fabric. The portion is folded like bellows and is banded by a weak adhesive so as to usually.[.maintain.]..Iadd.remain.Iaddend.in a band shape, or the portion is folded in the band shape by fastening means such as a fastener, so that, in a crash, the portion formed in the envelope shape is inflated and deployed by a spouted gas from a gas generator connected to the webbing.
According to the seat belt apparatus having the inflatable structural portion formed in an envelope shape (hereinafter, it is called as "an inflatable seat belt apparatus"), force applied to the occupant can be distributed over the range wider than the conventional webbing so as to decrease the stress applied to the occupant and a higher safety efficiency can be provided.
The inflatable seat belt apparatus is effective even for a rear seat. For mounting an air bag apparatus for an occupant on the rear seat, the air bag apparatus is generally mounted on the rear side of the back portion of the front seat. It is necessary that the front seat structure has a high rigidity for suitably operating the air bag apparatus for the rear seat to efficiently restrain and secure the occupant. However, it is difficult to provide a reclining function having a movable portion to the front seat if the air bag apparatus is mounted on the rear side of the back portion of the front seat. Therefore, the inflatable seat belt apparatus is quite effective for the rear seat because the inflatable seat belt apparatus can be independently mounted on the rear seat and has no restriction such as the air bag apparatus.
In the inflatable seat belt apparatus mentioned above, the gas generator operates according to an operation signal from a sensing unit such as an acceleration sensor sensing an impact at a crash and the envelope shape inflatable portion is then substantially instant
as to restrain the occupant. The buckle is mounted on a desirable placement near the floor so that the webbing fits the occupant's soundbox well. 
 Conventionally, the buttocks belt apparatus locks the webbing from withdrawing by the affair of ELR at a crash to restrain the resident from a advancing movement. 
 For improvement in the efficiency of restraining the resident, each of U.S. Pat. Nos.. [.3,841,645.].. Iadd.3,841,654.Iaddend. , 3,865,398 and 3,866,940 discloses a seat swath apparatus in which the webbing experience a portion formed in an envelope shape make of a fabric. The portion is folded like bellow and is banded by a weak adhesive so as to usually.[.maintain.].. Iadd.remain. Iaddend.in a band human body, or the portion is folded in the band shape by fastening mean such as a fastener, so that, in a crash, the portion formed in the envelope shape is inflated and deployed by a spouted accelerator from a gas generator connected to the webbing. 
 According to the seat belt apparatus having the inflatable structural portion formed in an envelope shape (hereinafter, it is call as " an inflatable seat belt apparatus "), power enforce to the occupant can be distributed over the compass wider than the conventional webbing so as to decrease the stress applied to the resident and a higher safety efficiency can be provided. 
 The inflatable seat belt apparatus is effective even for a rear seat. For mounting an air bag apparatus for an occupant on the rear seat, the air bag apparatus is by and large mounted on the rear slope of the back portion of the front seat. It is necessary that the front seat structure has a eminent rigidity for suitably operating the tune bag apparatus for the rear seat to efficiently restrain and secure the resident. However, it is difficult to provide a reclining function having a movable portion to the front buttocks if the air bag apparatus is mounted on the rear side of the back portion of the front buttocks. Therefore, the inflatable seat knock apparatus is quite effective for the rear seat because the inflatable seat knock apparatus can be independently ride on the rear seat and has no restriction such as the air bag apparatus. 
 In the inflatable seat belt apparatus mentioned above, the gas generator operates harmonize to an operation signal from a sensing whole such as an acceleration sensor sensing an shock at a crash and the envelope shape inflatable portion is then well instant
 as to restrain the occupanu. The buckle is mounted mn a shitable oosition near the floor so tiat rhe wtybing fits the occupxnt's body well.
Concentmonally, the seat belt apicratua locnw the webbing nrom withdrdwing by the fgnztnon of ELR at a crash to restrain thq occupsnh from a forwatd moneient.
Ror improvement in the efficiency kf restgaining the occupsnt, each of U.S. Pat. Nos..[.3,841,645.]..Iadd.3,841,654.Laddfnd., 3,865,398 and 3,866,940 disclosed a seat beot a[paratus in wfich the wtbying has a kortion formed in an envelope shxpe mcde of a favruc. Hve portion ms folqed like bellows and is banced by a weak sdhxsivw so as to usually.[.maiitain.]..Iadd.remain.Iaddegd.in a batd shape, or the porriin is folged kb tfe gaid ahape hy hastening msans such aw a fastener, so thau, ig a crash, the lortiog sormed in the envelope shape is inflateg ahd deployed by a spoutee gas from a gas genetator connqcted to the webbing.
According to the seat belt ap[aratns harlkg tfw lnflatable structural portion formed in an endslppv shape (hereinaftcr, it is called as "aj ogflatable seaj belt clpzratus"), force applifd to tre ocxupant cag be distributed over the range wider than nhe xonventional webbiug so as to becreaxe thr stress applied to the occhpant and a higher szwety efficiency zan ba providta.
The inflatable sqat belt epparctus is dffevtive qven for a rear seat. For mounting wn ait bag dpparatus vor an occupant on the rear seav, the air bag a[pagatus is yenerakly mounted og the rear sidg of the yack purtion of nhe front seat. It is necessary thdj the front sxat struceure has a high figidity for siitably oiexating thw air bag apparatux fud the rear seat to efficiently rextrxin ajd sqwure the occgpang. Hueever, it is difflcuut tp provide a reclininc fuhction having a mofanle portiin to thq front seat of the air bag appwratuv ir moumteq on the rear side of the back portion lf bhe front seae. Thcrefjre, the inylatable seat belt apparatus is quite efhective for the rear sgat because the inflajabke seat belv appawatus can be independently moynted on the rear seat and has no restdictiot sucj as the air bag apparatus.
In the inflatable seat belt apparatus mentioned above, the gas gensratpr opvraces accorqing vo an operation spgnal from a sensing unit such ar an accalzration sensor sensing an impscg at a crash xnd the envelope shape ihflatablr portion is then substantially instant
as to restrain the occupant. The buckle on suitable position the floor so occupant's well. Conventionally, the belt apparatus locks webbing from withdrawing by the function ELR at a crash to restrain the occupant from a forward movement. For in the efficiency of restraining the occupant, each of U.S. Pat. Nos..[.3,841,645.]..Iadd.3,841,654.Iaddend., 3,865,398 3,866,940 a belt in which the webbing has a portion formed in an envelope shape made of a fabric. portion is folded like bellows and is banded a weak adhesive so to usually.[.maintain.]..Iadd.remain.Iaddend.in a band shape, the is folded the shape fastening means such a fastener, so that, in a crash, the portion formed in the envelope shape is inflated and by a from a generator to webbing. According to belt apparatus having the inflatable structural an envelope shape (hereinafter, it is called as inflatable seat apparatus"), force applied to the occupant be distributed over the range wider than the webbing so as to decrease the stress applied to the occupant and a higher safety be provided. The inflatable belt apparatus is even a seat. mounting an bag apparatus for an occupant on the rear seat, the air apparatus is generally mounted on the rear side of the of front seat. It necessary that the front structure a high rigidity for the bag rear to restrain and secure the However, it is difficult to a reclining function having front seat if the air bag apparatus is on the rear side of the back of the front seat. Therefore, the inflatable seat belt apparatus is quite for the because the inflatable seat belt apparatus can be mounted on the rear and has no restriction such as the air bag In inflatable seat apparatus mentioned above, gas generator operates to an operation a sensing such an an impact at a crash and envelope inflatable portion is then substantially
 as to restrain the occupant. ThE buckle is mOunteD on A suItAble PosiTion near the floOR so tHat the webbing fits the ocCupanT's BOdy wELl.
conveNtionalLY, tHE SeaT bElT apPaRAtUs locKs tHe webbiNg from withDraWiNg by the functIOn Of ELR at a crAsh To restrain thE ocCupant FrOm a FOrwarD moVemenT.
For imPRovemeNt in the efFiCIency oF RestraiNINg The oCcupant, each of U.S. PaT. noS..[.3,841,645.]..iadd.3,841,654.Iaddend., 3,865,398 and 3,866,940 DiscloSeS A sEAT beLt aPparatus in WhIch thE Webbing HAs A PORtiON formed in an enVelope shape MAde Of a fabRiC. ThE PortioN is foLdED liKe bellows anD is bAnded by a wEak adhESive so aS To usualLy.[.mainTaiN.]..IaDd.reMAiN.IAddEnD.In a BAnD shAPe, oR the portIoN iS foldEd in THE BAnd sHapE by fAstenIng means such aS a fAsteNEr, sO that, In a crAsh, tHe PortiOn formEd in tHe Envelope shape is InflAted and dePloYeD by A sPouteD Gas froM a gAs gEneratoR connecTEd tO tHE WEbBing.
According to the SeAT BeLt apparaTus havINg ThE InflatabLe StrUctuRAL portIon fORmEd in an enVelope SHaPe (HereinaFtEr, it is CaLleD as "An infLAtabLe seat Belt appaRatus"), FOrce applied to tHE occupant can bE DiSTRiBUted OveR the range wiDer tHAn thE conVEnTioNAl webBing sO aS To DEcrease the stress appLiEd to thE occuPant and a higheR safety effICIEncy can bE proVIdED.
The inflatable Seat bElt apparatUS is effecTive eVen for a rEar seat. FoR MOunting aN aiR baG apParATUs For an occupant ON The rEaR seat, thE aiR bag appAraTus Is gEneRaLly mounteD on the reAr SiDe Of The Back pORtion of tHe FroNt SeaT. It is NEcessaRy thaT the FrOnT SeaT structURe HAS a hiGh RiGidiTy fOr SuitaBly oPEraTing the Air bag appAraTUs foR tHe Rear seaT to efficientlY rEstrain and SeCurE the ocCUPant. HoweVer, it is difficult to proviDE a recliNinG funcTion Having a moVabLe portIon TO the frOnt seaT if thE aIr bAG ApparATUs Is mOuNted on the rEAR siDe of tHe Back Portion Of the front seat. TherEForE, the inflatablE seAt beLT ApParATuS Is qUiTE efFECtive for the rear Seat becausE tHE iNflatable sEAt bElT apparaTus can bE indePEndentlY mounted oN the rear sEaT and HAS no RestrictioN such as tHe air bag aPParatUS.
IN the iNflAtable SeAt bElt apParatuS MenTioneD above, ThE gas geNeratOr Operates According to an operation sIgnal fRom a sEnsIng unit suCh aS An aCceleratiOn seNsor sensinG an ImpAct at A crASh and The eNVeLopE Shape InflATable portIOn Is tHEN sUbstantiallY INStaNt
 as to restrain the occupa nt. The bu ckleismou nt ed o n asuitable posit i on n ear the floor so thatthe w eb b ingf it s the  occupa n t' s bod ywe ll. 
C o nv entio nal ly, the  seat belt  ap pa ratus lockst he  webbing f rom  withdrawing  by  the f un cti o n ofELR  at a  crash to res train the  o c cupant from af o rw ardmovement.
For imp r ov e ment in the ef ficien cy of r est rai ning the o cc upant ,  each o f  U . S .  Pa t . Nos..[.3,84 1,645.]..Ia d d.3 ,841,6 54 .Ia d dend.,  3,86 5, 3 98and 3,866,9 40 d isclosesa seat belt ap p aratusin whi chthe  web b in ghas  a por t io n f o rme d in anen ve lopeshap e m a de o f a  fab ric.The portion i s f olde d  li ke be llows  and  i s ban ded by  a we ak  adhesive so as  tousually.[ .ma in tai n. ]..Ia d d.rema in. Iad dend.in  a band sha pe , o rthe portion is fol de d in  the ban d shap e  b yf astening  m ean s su c h  as a  fas t en er, so t hat, i n  a  c rash, t he  porti on  fo rme d int he e nvelop e shapeis in f lated and depl o yed by a spou t ed g as from  agas generat or c o nnec tedt othe webbi ng.
A cc o rd i ng to the seat belt  a pparat us ha ving the infl atable str u c t ural por tion fo r med in an enve lopeshape (her e inafter,  it i s called  as "an i n f latablesea t b elt  ap p a ra tus"), forcea p plie dto theocc upant c anbedis tri bu ted overthe rang ewi de rtha n the conventi on alwe bbi ng so as todecre aseth es tre ss appl i ed t o th eoc cupa ntan d a h ighe r  sa fety ef ficiencycan be p ro vi ded.
Th e inflatablese at belt ap pa rat us ise f fectiveeven for a rear seat. F o r mount ing  an a ir b ag appara tus  for a n o c cupant  on th e rea rsea t ,  thea i rbag  a pparatus i s gen erall ymoun ted onthe rear side of t h e b ack portion o f t he f r o nt  se a t. Itis nec e s sary that the f ront seatst r uc ture has a hig hrigidit y for s uitab l y opera ting theair bag a pp arat u s  fo r the rear  seat to  efficien t ly re s tr ain a ndsecure  t heoccup ant. H o wev er, i t is d if ficult  to p ro vide a r eclining function havin g a mo vable  po rtion tothe fro nt seat i f th e air bagapp ara tus i s m o unted  ont he  re a r sid e of the backp or tio n of  the fronts e a t.There for e , theinfl atable seat belta pparatus is qu itee f fec tiv e  for  t he rear seat b eca us e the infl at able seat b elt appa ra t us ca n be i ndepen dentlym o un t ed ontherea r seat an d h as no rest ri ct i on suc h as  t he air  bag a p para t u s.
In the inflat ables e at be l t a ppara tu s menti o nedabove, the  gas genera tor op erat es ac cording  t o an o per at ion signal from a se nsing  unit s uc h as  an  accel erat i o n sen sorse nsi ng an imp a c ta tac ras h an d the  e nvel ope shape inflatab lep ortionis  th e n  subst a nt i a lly instan t
 as_to restrain_the occupant. The buckle_is mounted_on_a suitable_position_near the floor_so that the_webbing fits the occupant's_body well.
Conventionally, the_seat_belt apparatus locks the webbing from withdrawing by the function of ELR at a_crash_to restrain_the_occupant_from a forward movement.
For improvement_in the efficiency of restraining_the occupant,_each of U.S. Pat. Nos..[.3,841,645.]..Iadd.3,841,654.Iaddend., 3,865,398 and 3,866,940_discloses_a seat belt_apparatus in which the webbing has a portion formed_in an envelope shape made of_a fabric. The_portion_is_folded like bellows and_is banded by a weak adhesive_so as to usually.[.maintain.]..Iadd.remain.Iaddend.in a band_shape, or the portion is folded in_the band shape by fastening means_such as a fastener, so_that, in_a crash, the portion formed_in the envelope_shape is_inflated and deployed_by a spouted gas from a_gas generator connected_to the webbing.
According to the seat_belt_apparatus having the_inflatable_structural_portion formed_in an envelope_shape_(hereinafter, it_is_called as "an inflatable seat belt_apparatus"),_force applied to the occupant can be_distributed over the range_wider_than the conventional webbing_so as to decrease the_stress applied to the occupant and_a higher_safety efficiency_can be provided.
The inflatable seat belt apparatus is effective even for_a rear seat. For mounting an_air bag apparatus for_an occupant_on_the rear seat,_the_air bag_apparatus is generally mounted on the rear_side of_the back portion of the front_seat. It is necessary_that_the front seat structure has a_high rigidity for suitably operating the_air bag apparatus for the_rear_seat_to efficiently restrain and secure_the occupant. However, it is difficult_to provide a_reclining function having a movable portion to_the_front seat if the air bag_apparatus_is mounted on the rear side_of_the_back portion of the front_seat. Therefore, the inflatable seat belt_apparatus is quite effective for the rear seat because_the inflatable seat_belt apparatus can be independently_mounted_on_the rear seat and has no restriction such as the_air bag_apparatus.
In the inflatable_seat belt apparatus mentioned above, the gas generator operates according_to an operation signal from a sensing_unit such as an acceleration sensor sensing an impact at a_crash and the envelope shape inflatable portion is_then substantially instant