| Title of Invention | BOLT |
|---|---|
| Abstract | In a bolt of the present invention, a guide portion (116) having a small diameter is formed at the distal end of a shaft portion (15) and ridge (31) having an inverted direction screw configuration relative to the ridge (30) formed on a constant diameter portion (115) is formed. When the bolt (1) is inserted obliquely into a nut (100) and the ridge (31) gets into engagement with a female screw portion (105) of the nut (100), an effect of floating the bolt (1) is generated, and the bolt 1 cannot be driven into the nut 100 unless it is set in an appropriate tightening posture. Consequently, biting and seizing of the bolt 1 to the nut 100 can be prevented securely. If the ridge (31) is formed into a double threaded screw having an inverted direction screw configuration, the effect can be further intensified. |
| Full Text | TECHNICAL FIELD The present invention relates to a bolt, and more particularly to a bolt formed to prevent itself from biting and seizing to a female screw member. BACKGROUND ART Conventionally, there has been proposed a so-called biting preventing bolt which when it is inserted obliquely into a female screw member of a nut or the like, allows the bolt to be threaded smoothly into the female screw member without any biting by guiding its own posture with a guide portion formed on its shaft portion appropriately. Although ordinary bolts have a shaft portion having a substantially constant diameter, such a biting preventive bolt is provided with a small diameter or a tapered guide portion at the front end of the shaft portion so that when the guide portion comes into contact with the peripheral face of a screw hole in the female screw member, the posture of the bolt is guided properly. For example, the Patent Document 1 has disclosed a bolt in which a constant diameter column portion having a small diameter is formed at the front end of the shaft portion and complete ridge is formed on this constant diameter column portion, and further the outside diameter of the constant diameter column portion is almost equal to a minimum value of the inside diameter of the female screw. In cases of the bolt 'having- sucISSi;iaffi«lig:feJaaae>-:when the' feolt is inserted obliquely into the female screw, e&erfroraplete ridge of the constant diameter column portion can cateh up the ridge of the* -female screw, and if it is continued to be tightened as it is, the screw portions can properly- emfatfeHwith esetn-r-O^tee^aioaf a- lead.' Patent document l* Japanese R»t»iit>: jippMeaticai Laid-Open No. 2000-18226 DISCLOSURE OF THE INVENTION PROBLEMS TO BI SOLVED BY THE1! INVENTION Under the above -described- conventional art, if the inclination angle of the bolfc with a?efflpecfe to the f ewale. screw meraber is relatively swali, the posftwf^.sfr fete? bolt is gstided" -appropriately by -the -shape of .tite g^ide- :' is drawn: iiifco 1^; gfrnsfltetoQ^^ However, if the.bolt is, inclined largely with respect to the female screw meinber;/ 'the/ bolt-'-eaii.ifee -d*awst:;AntQ fete fieaale scuew portion of the female screw raewber wifeh the p@sttire ©£ the toolt not guided appropriately, that is, the bolt remains tilted* Consequently, there is generated such a problem that the bolt may be drawn into the female screw member with a deviation in pitch, whereby still possibly generating, st bi ting;, and The present invention,, -has •:&eea. achieved to solve the above -described problem and an object of the. present invention is to provide a bolt which cannot be driven into unless it gains an appropriate tightening posture with respect to- 63ae female screw member in order to securely prevent itself from biting or seizing to the female screw MEANS FOR SOILING THE SRQKBMT To achieve the atenre^^sfe^te^i'-tJb^ecJt^,' -tto» .Belfe* -described in Claim 1 is a bolt having* a tS86sa&'y&i&i&&*! which a ridge is formed, the bolt being adapted to1 be tightened into a female screw meinber s&cto'aSP*- is comprised of a constant diameter portion hacvia§ a constant diameter formed on the proximal end side and a guide portion formed on a front end side thereof -aitd •horittg' a S8fca.ll.er- diameter tteau'the constant diameter 'portion, tite4trii4ife:-i'CSi?raedi'@n th®' fwi^e poartion being formed in an inverted. &&&&&£&&& eca?ew-'"e respect to the- ridge fortited 'cfti-'USe' cseSft«€aEff -d-iaaefeer portion. The bolt- deserfbfed' in dad*-:! :^---etiaas*ete1ift2e^: Sm ' ridge formed on the-guMe^orMc^^e $&&&& '$&!&&•• d©*i»le -:ehireacfed screw having »n- inverted direetdwi --&&&* cseaf ifu^atinate i»'a€dition to the structure of the bolt '€«se:M.%eW' i^:- ^laim' 1. The bolt described in Claim Sis charaiC^esiaisa'-in' that jacat-SKreatited portion having no ridge is formed in -a predfe1Ser«i»eid raug^ between the constant diameter portion and the giadde portion of the shaft portion. EFFECTS OP THE INVENTION In the bolt according to the preseafe invention, the guide portion having a smaller diameter than the constant diameter portion of the proximal end aide is foMBei5-OR.. tfctoe --froast end side of the shaft, and the ridge formed on this guide portion is formed in an inverted •dir®•etiJGm^^scaeW:'•'€^^i|ffUErat•i;8«a^ with reject to the ridge formed on'the eon«:feanfc:di;aTO't»i?«'|>ortioa^.,: Goftafttguftatly, when the bolt,is. insertesd^'Obiii-gwelf•"'^Htso/'ttie/ .f*«gj|s&--screw .portion, the guide portion of the bolt intearferea.with the' featale- screw portion of the female screw member, or the guide portion interferes and the ridge formed on the guide portion gets into engagement with the female screw,, of'- the; female «e.r«w member. • I-f the guide portion just interferes, with :ttoe lereai.ei*«^a?ew-;portion, the'bolt-is driven into the female ssespew.-member Mtsejrfcltait. -Rexfe,. if. the ridge of the guide portion is ^ bolt is rotated in a direction of being driven iatQ the female screw member, it comes that the.boltescapes from the female screw member due to #&^g&ai^-'l&^ direction screw comfigurstdojft^ .©€ the --.gpAde. :p©rtion aad' .-tehee female screw portion. In other words, beqause -tlw bolt is disabled from being driven into the female screw member when it is tilted, the bolt is never driven into the female screw member in an inappropriate condition. Therefore, biting and seizing of the bolt can be prevented securely. In the bolt of Claim 2 in which the ridfe formed on the gw&ie portion is formed" dtst©•>^s^^'^^is^ih^'iKs& formed on the constant diameter portion is £;.:! ingle pltSsb pear revolution of the!bolt 1, while the aBS©«nt of travel of' .the ridge formed on the guide portion is two pitches, ioasequently, the effects of easiness of escaping*'are intensified .as .compared with a case where the ridge formed on the guide portion is of a single threaded screw-. In• the' Isolt deBCSJilJed^in Claim $•, the non-threaded portion having no threadsis-Corrae^l ife a-^reiSe-teMftii»t'3?amge foetween the constant diameter portion 0£^tiSsr($B8)&ife. fptS^itSGili; sad 'tdte- fui.de portion, so that, when the bolt is inserted into the female screwportion of the female screw member ia a tilted condition, the non- threaded portion, and, the female screw portion n,e»sner «**ga peripheral face of the female screw portion. Consequently, the bolt never bites into the female screw member and the bolt can be securely prevented from biting and seiising «p. BRIEF DESCRIPTION OF THE DRAWINGS [FIG. l] FIG.1 is a side view of ^a bolt of Claim 1. [FIG. 2] FIG. 2 is an enlarged'-irle% [FIG. 3] FIG. 3 is a sectional view of a part atiapfi®® a condition in which the bolt is inserted into a screw hole of a nut in a tilted condition. [FIG. 4] FIG. 4 is a sectional view of a part showiiiag a condition in which'the bolt ±'S'tji£raed'1^6 the condition of FI©. 3, [FIG. 5] FIG. S«isv-a sdde - in which the" bolt v af • FI nut in a tilted eojaditioij.. [FIG. 7] FIG. -7 is an •ealarge^^^^sr-M-a;p«rt^0li@wingr, a-front end portion of a shaft portion ©f a. belt of Claim 3. DESCRIPTION OP JREPBRffiSFCE BTONKRALS 1: bolt 10: head portion 15; shaft portion 3 o: ridge 31: ridge 32; ridge of double fcteead£itrs. 115: constant diameter portion 116; guide portion 126: no-threaded portion BEST MODE FOR CARRYING OUT THE UHVEOTIQN 1 Hereinafter:, the-first emfeodiHaeat .of the^bolt of the present invention will bevde'0£rilieia vfi't the configuration of a fedlt M and FIG. 2. PIG. 1 represents a ffiraplifiedtteead f-oarmed on the bolt l. As' shown in FIG.l aKajfrP3-,2;i;":l*fe feolt-a is-eoastiCttted of a substantially hexagonal coluras-lifce feea& pMrfeiom 10 .extending along a common shaft center and a swbs%antialty cylindrical shaft portion 15. A proximal end -Side'• into a cylindrical cOastaaat d±ayt%te* p^Jrfeionr-115'liaw'ing a tfonstaat diameter and a ridge 30 "is "iO2««e!& ail ^te '^iteiBBeft 'fe*%fegzal face of the constamt di8B*et*r'p$^iii*!3tl&---wi!^ This ridge 30 is fonftBfl'i&to-a. **«^-liiai^0iKea«*Ga*^ allows the bolt 1 to be driven, into the feUai^e.-^S-sfe^wentoer-when it is turned in the rigrhtward direction (turned clockwise) . The distal end side of t3sfe--si^t|>©^^ «. shape having a sitialler;diawe>-te'«r*1d$eii! tlfe c@a?tion 115 and it serves as a guide portion 'It6 for guiding ooirfecttly the posture of the bolt 1 to a right posture when the bolt 1 is threaded into a nut described later. In a specified rafige-of'-the £a?0M.-eiM'ot.t^e"ic?©iastimt diameter portion us, more 'Specif ica0.1y, m r-aai^iB of a 'lemffeli t^iat Is arooad three times as' long as a •p*tKih-^l';ti^i3ri%e;:S0> !^e heigWt •&£ me ridge 30 decreases gradualfly •,&&WR -ttee-fKDiae^Bll-N^a '&£ the'»ha£t portion 15 toward the-troiiit erti/'^'i%aI€'tii^-«^fe«e«al': sfaafrn'of- the screw thread formed'by' c-oimect;diigf'"lste^ '0i?eiBfes^f'Tf%e.-3-0 ie^tsap'ered 9 at a taper asigle & it should be noted tiiat t&e..!d4aase:t»er of ttoe root of the constant diameter portioa '3ta?5 inelu»i*fif- *fea* fort-iipa: is of a constant siae. Further, a.;fiR*^s®fefc^»y«ifeE«K9lfe^ «c«^:4rtNB!Mlt'Mf>e»tiA'-portiq^ 117 is • fame* ini *••#*•# ifMMMMt MW^t A^^KBii •&:/ppfcdjs, iMWt&oa 116 .and the, constant diatn&teEs poz^L^t: (,tlS,w.;; Hi^e :titpjtf»d. -portion 117 is conrpriseti' ©f A.tciap(M^4MMMMMl9A^ to the root diameter of «&£ cojjataafed^aoeter portion 115 and a circular crest- ^r^^o^:i1^6m£^: Km^-^^lii^^i^Si^. &m.•.$&£•: diameter of the non- threaded^portioji":ol ^tehe -psdiiB potion 3,16 described. later and its diatRetear--is'idee»iffi« bottom portion toward: feke-.ijesfe•:«i^Wbe no sidfe is formed on the external peripheral face. The guide portion 1S£ extends irop fehe%f3Jcmt end (crest) of this taF^red poaptioi* WH- tiQwswS tJldS #»«aa* • non-thKeadfed. |K>«^^-Ll.^H:|«^;i)p|^g|' u% ,-fcM^ is ^exsmad. More specifically, on the proxiittal ead .Bide.0-i;;i]|6-.giii the non-threaded porticaa 126-,i« Icwised. over m length s-ubstantially 1.6 t.iroe^a.s*: itaMr9fh:1&!Bi&MAW4t^^ diameter portion 115 and a rl-dge-.S.! i^s formed 4-n-an,,area of a further front end side,, fbe ridg^>$.J^triP^^--v»si|5h .a .^idge<: .about> 60° and' has the same piteh as fctoe 3tk&Q&,- 3&» H*e roo-t diameter of the ridge 31 is sraaller than the diameter of the aon-threaded portion 126 and its outside diameteeas is larger tfean .the diameter of the non- threaded' portion1 12$. "'tt ' diameter is formed smaller thiii'-the^in&ide diMtafetet of the' female screw portion of tftfe fe%& Je ^^5^»er%"%^i--'»teB®i tali tj©!^ I engages. The ridge 31 forffletftJO: tlte jfu3^'$o^i into an inverted direction ffct^»:eoftt-±ttirsttl ridge 30 on the constant diameter portion 115 is in a right -hand screw ccttf igiiraticto' 'W&ioir tf&i&m- iii'-'wftfe a right-hand rbtmfcioli, tM £ is forroed to be released from the female sc^w member •srtien thfe- bolt 1 is turned in the rightWard Next, 0c2?ewlng-1:of eta«f '(ff2 tljfe screw member will be describe^ wftfc? f^eren^fe to #! 4 . As shown in PIG. 3, the nut 100 allow® a male screw meraber in a right-hand screw configuration to fcfe threS^M into ttie nut 100 and the bolt 1 ia inserted into a ser** hole 11*6 waile it is tilted at an angle with respect' to tMe: nat'lttd;. '^o" %fe|t- W: tfitt/- 'ridge' 31 formed on the guide portion -M.I 'oft ^isr ffrdnt "et^l M«e of the shaft portion is, the coti^>l^t« rin%® -ii^lliit'1^pn6at 4ttfr it ia e^gageaient with (in -mesh withy the fenkte n&" portic«i IDS bo tfie iarter peripheral face of ^the mtt fiM, 'tltii' !«JsW ' 'cbftllffeion, oil tihe peripheral edge of am;'Opeminf i^rl:i«i-l%i csf "tp»e itot'lOt^ a Si8e in which the bolt' 1 is 3x)i&&:WeM'i" &}&• ^^s' W at tlfi9""fr%nt':*eai['*of the constant diameteo: pdrtiaa'ilf '"d&f t»e i^3tt 1' 'tries' to engage fo with the fetrale.s of the pitch, it sboald be sated &hat,, in the .figure, a condition in which the $ejn»|e ,-SQSew, p0i$&aft..}9$ of .£&& nt$ .100 overlaps the ridge 30 at the. • f ffpt^ipftMg^ 115 Qf the bolt LiafiaHtts.-&bfcfc*^.r^ 'female screw .portion. -10& When the boll; 1 is turned, (elqcjkwise) in order to engage with the nut IftO, the guide ,portic«cv .116 moves in a direction of escaping from the screw hole 110 of the nut 100 with the clockwise rotation of the bolt 1 because only £he ridge 31 on the guide portion 116 is in engagement with the female screw portion, 105 of the nut 100, and as long as the ridge 31 on the guide portion 116 is in engagement with the .female scr«w jjorti^ 1Q§ f e^ren ifi,^, Aft .slight, the,.;foolt l moves :in the ^m&^±i^^j^j§^i^^^if^^»^^ ll?0® •&& screw hole no in the out .1.0-0 .(•^wai>d,djiii»efeAsm in.:thsFi§iur$.K Althpugh the ridge 30 f onued .:a,;t tefetft .Ijc^ptt $$&,&£ ,,jfcJ*e,,G^p9fe?P^t; diaiaeter, portion 115, as well as the,rid«|e3,l-.qj| |^.,pi4de,pc>3ftion,116-:r is interfering with the .fe«aile,,gcre^.j>ccti^| 10Sf, fefee' hwaigtoi^^i ,the .ridge .30 at the. front end of the ,-,cjepS)taa;fc djfc$n«fe$ar portion. ,115 ,i3.. sn».ller than the height of the ridge 30 at other portions of the constant diameter portion 115 and it does not engage with the female screw portion 105 deeply. Thus, the ridge 30 at the front -end of the constant diameter portion 115 never engages with the female scjrew portion 105 while the bolt 1 moves, jUi, the direction of escaping and the bolt 1 succeeds, in. escaping; from the screw hole 110 smoothly. Further, when a non-threa^e&^i^i;^ tS6' screw portion 105 of the1 fast i&(H&0a- the b©rt 1 irs $oca&e$ above the condition shown in the Wgu^^jidJB^&fciS' tilting1 aiJtffe1 !# greater, the bolt 1 never engages with fehf riut? 100 at ottite* portions than where the ridge 31 Of' the ptiSfe-foi-eifen' liC is-"in efffagetttettt with the female screw portion '.105, "wiieasefe^'-tJHe bolt tr «ffespes rrota'the screw hole 110 smoothly. FIG. 4 Snows a condition' when in which, subsequent to the condition of FIG. 3, the ridge 31 of the -guide portion 116 in engagement with the female &cre% pfetion iOS,'fcira &03,t 1 is turned by 60° in a tightening direction '(rigntwkrS ^lre%t±cfe} . AS shown in PIG . 4 , it can- bei ' conf irfl^rlitei^i, 'piftjife Ife1 .edi tlte Mdfe 31" df : the guide portion 'll€ SS&d'€ p^ft^^-l^^oW'liMr rii^' |.tf"a^ the rriet end of the constant diameter 'portion llSlKv-es'^reapisctive'^ Toy 60°' so that the bolt moves in the direction of escapirtg, and the ridge 31 on the guide portion 116 engages with the female screw portion 105 so that the bolt 1 moves in the escaping direction with its rotation. In FIG. 3, the ridge 30 at the front end of the constant diameter portion 115 overlapping with the female screw portion 105 of the nut 100 has moved up to the vicinity of the opening portion 101 of the nut lob after the bolt 1 is rotated by 60* alia consequently, the ridge 30 is not in engagement with the female screw portion 105 of the' nut lO'O the 'bolt l afid the Itof 100 beiag prevented' from biting or seizing. Although- not .;«[email protected]^tstii-r, ,vtoi$B.:r$, ,:ppcksr. who, driven the bolt 1 res tores, the bolt 1 feo,.$-*fe3rtica£.ly. standing posture from the tilted condition* the l^t«l JrfM&t isfco an appropriate ppsture into the screw hole-lift Q£v$fc$l.tiu&na,00 >d«e^t$,4£S-. oiwn,,weight, the bolt 1 cornea that fche.bQifr :yj.ft«$4j|fe^n@d ^"^-^y- $& should be noted that the outsid^ .diaroe|-:e:,K:.o^ .tjie ridge 31 needs; ,to be formed smaller than the inside diameter of the feaaffe $%%$&&: fj^orfcioa 105 in order to prevent an interference between the guide portion 116 of the bolt shaft portion 15 and the fspale screw portion 105 of the nut 100 when the bolt 1 turns into an appropriate. screwing posture. When the ridge 31 formed on the guide portion 116 of the shaft portion 15 .is,, pot fit i&t© (in eng^gejBeUt wjlth) the female screw portion 10S ijat&e i/esn^e pejsijph«isa^.-/fas!se,of,i.|:he..jiut. 100, for example, if the- ri,dfe.311.foziitei4,',fi8a^e cpi:dfi, ^©srtion-116' is just interfering^ with the... Ceffla-Je. S£*ww,...pojrjtion. ,10& in, the inner peripheral facie ai t^.:;nut(.3^*^^||i-sbo3.|;. 1 .bf^OB^a £it into 'the screw hole .110 ,,in .t^jfe. J«*fc. 2.0& ;tejr .:4fefil-'Cw«P ^sigii^. in,,an-.-appro|)r4ate posture .and after ,ttat,,. ,the,,liplfcl is fci^lgfeeitted: i3|to;the,nut 100 as normally. As described above, in the bolt 1 of this embodiment, the small diameter guide portion US is formed at the distal end of the shaft portion 15 arid the ridge 31 in an inverted direction screw configuration to the ridfe.^sO Jorrafed on the constant diameter portion 115 is formed on that guide portion 116. Consequently, in. the case that the bolt 1 is inserted into the screw hole 110 tilted with respect to the nut 100, when. -ttie-fi 116 becomes into eagagememfc wftH t-life-f'^al^'ife^B^'pS-ft^on" 10S Of che nut 100, the bolt 1 moves ;iii SNiil%(tif^ © J1 e&e^iiig f rora tne nut 100' because- •'£&&• -'&©it ir-'^-B^-''^-^--'^^^^^^ %:$gi*«aiag posture . • Thus, tttfe *>olfc« gjg& i&ftfeft* it is in an appropriate tightening pestware wita respect -i& %Kje;niife 100 and consequently, the bolt is never fit into the mat in an. appropriate conMtioii, f^'^&Xsii^Mi ^'^^I^i^W^M^cyaf- fe-hereby preventing the bolt -frail Although the ridge 3-1 lia^isir fcils 'ia&ve*fc-e«'. dlreefeioa serew configuration of the guide portji@n 'lit- •screw having an inverted €ire€l'i€Hi fe^rew' '€Qnf ifafeatdou are-foiittedon the guide portion 116 . Secawse^tiie'6'ther coat igtxrations are the same, -like reference miweralsr'ysrej 'attached sfeO' 'th*1 portions and descriptions taieriii£' the nut 100 in a tilted e€mdifcMsH-^fll'!^fig>e«C'-;f§tt^ne nut;;100, as shown in FIG. 6, the ri the inverted direction screw configuration on the gmide portion 116 gets into engagement with the female screw portion 105 of the nut 100 , thereby floating the bolt 1 . However, the amount of travel of the ridge 32 formed on the guide portion 116 corresponds to two pitches per revolution of the bolt l. Thus, the effects of the escape become twofold as -GQinpared. with a .case where the ridge 31 formed on the 'guide portion'-lifi .is-^of a single thread screw. As a result, tl»,1,tojq!l-t^l-€aip2C>ts«^p?il«r|,Tpp iato-ttae-j t&it 100 unless the bolt 1 is set into, an appropriate, -tightening posture with respect to the nut- lot-, -tJier-efeif ^^^siig-^ffSie^^i^bitipff and seizing to the nut 100. Next, the second etabedinent 200 is formed into a substantially identical configuration to the bolt 1 of the, above -described- euiijodiraent except, that the guide portion formed at the JSrgot ••es$-©f*,Jttee e^a£t the shape of the front end of ,:the ?shaf-t portion of the bolt 200 i s described in detail . FIG . ,.7 If an enlarged view of a part showing the, front end portion of a shaJt, portion 215 of the -bolt 200 .and the. same reference niaraeral as the bolt 1 are attached to common components common to the bolt 1 ©f felie above described embodiment . As shown in FIG. 7, the bolt 200 has the constant diameter portion 115 on the proximal end side^of the shaft 215 and tehe, right-hand screw ridge 30 is formed^on the ,-f oftafeant diaweter portion 115 . The height of the ridge 30 d«creafe«,>^cadually at the. front end portion of the constant diameter p©fti^-:ltl,5 ap .feha&.fche,, external shape of the screws pr«Kfuc«Kl by is of a tapered c^mf.i^n^ftt^ffik.ifiK9isA» diawefeei:' €te In the bolt too, extends from the front ei*f of 'fefee- «a&ta»t ^amefcer portioa IM, different from the bolt'l. TM& 4^~t9frea&ftd .portion 226 "haw -;-«. substantially identical' «iatee€iBl*"feo' fchte- ESot tapered port ion mTe&te$ti* M * ^^«ftoi^-li*^^Je3J@tte«lie^f ront end of the nect--thr^^^'^^M?fiiilft-2M,' lii '%f$^^$&8$ti!&a. ^SiM= -toswinf, a much S'tnaller Maiw^ilP--'%iiaEi3®f •'^Mi^al^'«£^^» aesotofeaat diameter part ioifi-15 e^ci^ltad- fltaafc^MM-lflB^lJM^ttwl p©rfci«>a' 217. A ridge- 2'3:l lower &iwn the -rf a§*! 3fr"f oirwea-om-tJae-guidei -portioa 116 of the bolt 1 is formed on the guide psgrtibn 2t€ ami to the ridge 30 on the 'Cons-tamt':' a left-hand screw- c©ttfiftara?bi©li.!: • WHJLe-fefee-Srliiip^' &l-'dsc 'tiie :guide' portion 116 of ^the bolfe 1 ft ;S^«ie1iJ«rfs€&; a S0°, the rickfe 231 .0 The' bolt 200V • off' occurrence of bftiiig when it is 'atiwaftSlfceW obliipifely in^o thte female screw member, sti'eh as a nufe. ^eiBflieatly, 'Wl^a tlie bolt -200 is inserted obliquely into a ^re^a^i'fe-of-m-iSit^il^S' is Hot -sfhown-, the ridge 216 fbrmed ok- the giaidfe- poWtion 2-S1- aaid'tihe feniale screw portion of the nut interfere witli each otter, flfe^ever, tbe biting with -the female screw 'portion iS-vsJlMlo'w be 200 of this -eTOBoaiwe^at ete-tiippessf tiltttt'-^Hefrferof when it is inserted. into? 'td3Be:,:feniaie;^.ae»0»'Bi^Ei^sE:,J; m&h -&B >a-nut/ and the bolt can be..drivsemiii£o -se^iit»3>y*.w*tli-.^-«ii>r-®priate tightening posture . Tfc'Sasalat tem0fcii&'%jai& •!$$&; •Ti$@*i%3i>& 1^3 b& O* « -single threaded screw or a double; tteeaded Sicrew. As describ«edi-ai>©fy'er. ,,fex^|je, fej^t ©&.tjae present invention, the 'c&asfeaafc/d&aim^ end- side of t^a-slmffe-p©rfe46&>«B^^fe^^^^^^^i®a'^piiftgi is formed 'om.^tee/f m^'^^^fii^t -i^i^^ iUt§e^tn tfais is formed infeo,.:an. ..Jawe-rfced • diJS^etiGUi^ ;pc:r©*i- cpitfifiiration as compared with the ridge ©f the constant diameter portion. Consequently, when the bolt is inserted inappropriately into the female screvMneraberr :m©jre,sj>e the bolt cafM3$t '$& driven •1^$ tplef s,-it $& set into .an appropriate tightening posture with respect to the female screw member, the bolt is not fit into the female screw, member in an inappropriate posture, for example, in a fci.l*.ed- condition, ijiting or seizing of the bolt to the Cen^tle ec&w e prevented securely. Further, the effects can .bf.- ijitfijiaif led by fiormiag the ridge on the guide portion in a double threaded screw configuration. In the case the non- threaded portion having no ridge is formed between the constant diameter portion • ai$$vt&e guide .poasfeLept, when the bolt is inserted into the female s bolt can Ibe prevented from biting1 into the female screw member. The present invention is not restricted to the above-desilcribed embodiments! bat toay:&e mMifle Although f.n this embodiment, a mat fea& been ex&taplif led as a female screw member. it is natural' that ISe-feblt of tHe' pr-eseitt invention can be applied to other female stJr^vrmefnbeirs'. Although in this embodiment, the length of the iareit(fiiiteich tfee'ljelght of the ridge decreases' gradually on the constant diameter1 portion of the bolt, the length of the non- threaded ^ortitSi, the 3be«gth of the tapered portion artd the like have been e^elftplilied, ttteWe-'are mere examples and it is jjieedless to say that the respective portions may be formed into siz4s other than mentioned in the above embodiments. Additionally, the shape of the ridge formed on the guide portion and the shfepe of the ridge formed on tie constant diameter portion are not limited to -those of thie' embodiment but may be modified appropr i att ely, We Claims:- [1] A bolt having a head portion and a shaft portion on which a ridge is f formed, the bolt being adapted to be tighatened into a female screw member such as a nut, wherein the shaft portion is comprised of a constant diameter portion having a constant diameter formed on the proximal end side and a guide portion formed on a front end side thereof and having a smaller diameter than the constant diameter portion, the ridge formed on the guide portion being formed in an inverted direction screw configuration with respect to the ridge formed on the constant diameter portion. [2] The bolt according to Claim 1 wherein the ridge formed on the guide portion is formed into a double threaded screw having an inverted direction screw configuration. [3] The bolt according to Claim 1 or 2 wherein non threaded portion having no ridge is formed into a predetermined range between the constant diameter portion and the, guide portion of the shaft portion. |
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| Patent Number | 279796 | |||||||||||||||
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| Indian Patent Application Number | 10191/DELNP/2007 | |||||||||||||||
| PG Journal Number | 05/2017 | |||||||||||||||
| Publication Date | 03-Feb-2017 | |||||||||||||||
| Grant Date | 31-Jan-2017 | |||||||||||||||
| Date of Filing | 28-Dec-2007 | |||||||||||||||
| Name of Patentee | AOYAMA SEISAKUSHO CO., LTD | |||||||||||||||
| Applicant Address | 101-2, YAGOTOHONMACHI, SHOWA-KU, NAGOYA-SHI, AICHI 466-0825 (JP) | |||||||||||||||
Inventors:
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| PCT International Classification Number | F16B 35/00 | |||||||||||||||
| PCT International Application Number | PCT/JP2005/010777 | |||||||||||||||
| PCT International Filing date | 2005-06-13 | |||||||||||||||
PCT Conventions:
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