Патент USA US2407742код для вставки
Sept» R17, 1946. w. T. GooDBY 2,407,741Í SCREW-THREADED MEMBER Filed' April 6,A 1944 1 1@ l ì )0 M 1192A, magg. 11194. 16 '1W-É' I6 £0`Ä". j r ` , ' 3g ¿î? .-179 ' 14C-v l 2W.. ¿É? Y £1,421 I? w _ .a 1f' ß Íî e ß *W ¿if 12 if' *"3* _26 V £5 y 34'" g] 101` ' l - » pg '--»»N ' £6 y 10 g3. / `_, . Y ` _ , 1 ’9 lImmzzìr /Willzam Z’ 5ML@ vgáârwyf 1 , Patented Sept. 17, 1946 2,407,741 i l ‘ ` PATENT i ‘ A `- ì OFFICE »2,407,741 SCREW-THREAD@ MEMBER ` William Thomas Goodby, Bristol, England; as signor-to-TheBristol Aeroplane Company Liam.-:itedß Bristol, England, a British company Application‘April 6, 1944, Serial N0. 529,381?` ` Great BritainApril 2, 1943 7 ciaims. (o1. rs1-22') 1', 2 This invention concerns screw-threaded'mem' bers-of 'the type in wl-iiclruponA the male member being screwed into the female memberone »of vsaid members lis forced linto intimate Contact with the . other-"telcel:4 the members against separation. ` According `to> the present invention the male and l:female members are each Vso formed that ‘ upon-the male'mem'ber jbeing screwed into the female >menfiber they co‘-act to ‘displace‘the >mate» rality-of spaced studs Il, said studs» protruding from the end face of the cylinder and passing through a corresponding number of holes in the holding-down flange l2‘of the junk-head 13; The flangeof the junk-head is clamped into-in timate Contact with the end of the cylinder by ¿nuts |41 carried `on the studs I’l. It is .a common practiceyto provide an interference iit between the stu-ds H and their associated stud. holes l5 rial Aof 4the female mem-berend producea collar with `a view to» ensuring that the studs do notïwork whose diameter rrris >less than thev crest diameter - of‘the‘threads of the male member, Yand whose loose during operation of the engine.` Thepres ent invention aims at providing an improved function'is to lock said' members against' sepa form of lock for sai'd‘studs. ration. _ ' ‘ ` ' ' ` According" to another ‘feature oi ‘the present invention the male member 'is screw-threaded - over ‘part of its ¿length and is formed over an other part of itsA length with'an unthreaded por tion whose diameter lies-between the crest and trough diameters ofY ‘the screw-thread, the ar rangement vbeing that ‘upon said‘ member being screwed into the female member’said'unthreaded portion engages the threads of the female mem ber'ßthereby displacing them to form a locking collar which prevents separation of the two mem bers;Y ' ` . According to the present invention'each `stud ll is formed with a locating collar i6 which separates that portion Il of they stud' which is screwed into the cylinder from the portion IB which protrudesthereirom to `receive the hold ing-down nuts Iâ. The threads on the stud are formed by a thread-rolling operation in'which a blank I9 (Figure 2) whose shank diameter :r is ` approximately equal to the effective diameter‘oi the threads tofbe formed is rotatedbetween a pair of rollers having the required thread form. The rollers form the material of the blank into troughs below lthe effective diameter and crests AccordingV to yet another feature ‘of 'the Vinven tio-n the vmale vmember is formed‘with a shoulder above the effective diameter. When producing the threads on the studs in this‘manner it is’nec essary to ensure that the threaded portion of the against which the material of the female mem ber is'adapted to be forced‘whilst saiä'collar is 30 stud stops short of the locating collar Iâ (formé being produced. Á l ' ' A `speciiìe embodiment of the present' invention asapplied to the ‘holding-down studs for lajunk head'oi a‘sleeve-valve internalcombustion engine will now be described merely by way of example with reference to the accompanying drawing of which: ` ' ` ’ Figure l is a sectional elevation of a cylinder and junk-head assembly in which *the‘latter is secured to the former by'ho-lding-‘down studs in accordance with the p-resentinvention; Figure 2 'is an enlarged‘view of a blank _"from which ‘the holding-down studs are produced, Figure 3 shows a holding-down stud which has been produced from saidblank, ` Figure 4 is a sectional elevation ofY a studho'le ’ stance at Eil) as otherwise there is a danger that the forming. rollers will come into engagement with the collar with consequent damage to said rollers since the collar has a greater ldiameter w than the shank of blank I9. The stud which is produced from the blank-*I9 by the thread-rolling operation described above is shownin Figure 3. It will‘be noted that the part l'l of the stud which is to be screwed into the cylinder comprises a threaded portion 2l ,thel‘olä eating collar'i’ß whose diameter w is approxi mately equal to the crest diameter z of the ,threads and lying between the threadedY portion 2l and the Acollar-t I6 a plain `portion 22 whose diameter .r is equal to the eüective diameter of `the screw-Vthreads. A The trough diameter of the threads is which is adapted to 'receive ‘the holding-down indicated at Vy, l stud- shown in 'Figure 3; To accommodate this stud; the stud holes. l5 of the cylinder are each iorme'd'with a threaded portion 23 which is off greater length than ‘the threaded portion 2l ofthe stud;` an unthreaded portion 2,4f`whose diameter is the same as the diameter ofthe `locating collar I vlì but whose depth . Figure 5 is asectional’ elevation oi a stud hole with a stud partly inserted> therein, and Figure 6 is a 'section on the --lines'VI-VI of Figure l, this ñgure being to an enlarged scale foi- the sake of clarity. Referring to the drawing; the 'cylinder l0 of the internal combustion engine receives a plu ` is approximately-one-flfththereof, and a recessed portion 15‘ whose diameter i's-«slightl'y greater allori/ii y3 4 than that of the unthreaded portion 24 (Fig ure 4). The stud Il is readily threaded into the stud hole l5 until the unthreaded portion 22 of the stud is brought into engagement with the threads ' bolt and being substantially of a length equal to the combined lengths of the threaded shank and plain portion of the bolt whereby when the lead ing end’ öf the bolt is screwed into said socket throughout the full length of said threaded of the stud- holeV (Figure 5). When; the stud ¿is shank, such leading endA of; the lboll‘fwill Istill be screwed Vinto the stud hole from this position, the above the lovverv end of 'the' threaded socket and further rotation of the threaded bolt will cause unthreaded portion` 22 squeezes the crests of the female threads lying -above the eifective diam-„1 ‘ the plain portion of the bolt to ‘squeeze the crests eter into their troughs thereby to produce a. col of the socket threads lying above their effective diameter into their troughs. lar 25 whose diameter is the same as the diameter A>-2. A threadedcoupling comprising a threaded Vof the unthreaded portion. When theV »stud hasr been completely inserted in the stud hole l5, the` f male ,memberI >or bolt, and a complementarily collar It (as shown in Figure 6) fits tightly into threaded socket or female member providing an the unthreaded'portion 24, which is the same di~ 1.5 anchorage for said bolt, said bolt comprising a ameter as said collar, and passing through the threaded‘shank at thevleading end of vthe bolt, recess portion 25 protrudes above the end face of ` >a plain portion adjoining said threaded shank, a locating collar above the plain portion, and an the cylinder to receive the junk-head. The mate attaching portion above'the collar, the diameter rial forming collar 26 is consolidated'when the locating collar I6 engages with andcompresses it 20 _of‘said plainportionbeing approximately equal in an axial direction. ' to »the effective diameter» of the threads _of the shank portior'n'the diameter oi said locating collar ` l It will thus be appreciated that with a stud and 1 exceeding that of thediameter ofsaid plain-por formed‘on the insertion of the stud a locking col tion, Vsaid socket having a threaded portion of lar `2li of material which is in intimate` contact 25 greater length than>> .thethreaded shank of the bolt 4and being substantially o_f a length equal to with the stud and whoseA diameter is greater than _stud hole of the constructions described there is the trough diameter and less than the crest diam _the combined lengths of the threaded shank and plain portion ofthe bolt whereby when the lead eter of the-male threads. This locking collar ren ders it difficult to unscrew the stud from the stud hole and also prevents the stud from working 30 10QSB! v irig `end oív thel boltV isV screwed into said socket throughout the full length of said threaded shank, suohleading end of the bolt> will still be above i A further advantage of this constructioni re sides inthe ability to ensure thatV the height which the lower end of the threaded socket and further rotation of the threaded boit will cause tnepiairi the studs protrude from the cylinder issub'stan tially constant. This is dueto the fact that the portion ofthe bolt to squeeze the crests‘of the socket -threads lying. above their .effective diam degree of formation of the locking collar is a eter _into their troughs, said socket having an functionfof the depthto which the stud has been inserted and to the fact that itsformatiOn will ineach case require the exertion of approximate unthreade'd portionradjoiningthe upper end of ` the threaded portion and being of greater diam- ' eter >than said threaded portion to receive the ly the same torque. When the latter has reached 40 lower end'portion of said locating collar. apre-determined value it therefore follows that 3. A threaded coupling comprising a male the stud has entered into a stud hole to a pre member> having a threaded portion, a locating determined depth. ` collar and an unthreaded portion intermediate >.Although the invention has been described as the threaded portion and the collar, said un applied to the holding-down studs for a junk 45 threaded portion being of a diameter substan head of a sleeve-valve internal combustion engine it will be appreciated that the invention may be tially equal tothe effective threaded diameter, and ‘asocke’t member having a complementarily applied tomany forms of screw-thread joints. tlfireadedV portion deeper than the` threaded por tionoi ‘the male member whereby when the male supercharger oasings, gear boxes, and the like 50 member is screwed home said Vunthreaded portion and to threaded collets, pipe joints and spark K will displace crests of threads lof said socket Thus the invention has application ‘to studs for p'lug‘ada'ptors. " ' ` member into the troughs thereof to form a lock ing collar around said unthreaded portion of the male member at'the'entry end >of the socket ` In putting the invention into effect the mate rial of the female member of the joint may be of a more readily deformable material than the ma terial of the male member 'such as aluminium, 55 member. " . ’l ' . aluminiumfalloy ory magnesium when the male 4. A threaded'coupling comprising a threaded male member and a complementarily threaded member. is of steel. Alternatively it may be of, a female memberof greater axial length than the similar material, for instance steel or cast-iron male member for which it provides an anchorage; ' with a male member of steel. In the embodiment 60 the male member having an unthreaded portion , described above the cylinder is an aluminium a1 ’loy' whilst the stud is `of steel. » s I claim: `1.l A threaded coupling comprising a threaded whosediameter issubstantially equal to the Veffec tive diameter of'the’threads, a threaded portion disposed between Ysaid _unthreaded portion andV the end of the vmaleinember which enters the male member or bolt, and a complementarily 65 female member and a lo’oatingfcollar disposed on .threaded socket or female member providing an the> other side of saidunthreaded portion from anchorage for said bolt, said bolt comprising a said threaded portion, said 'unthreaded portionr threaded shankat the leadingend of the bolt, a engaging the threads vof the female member to plain vportion adjoining said threadedshank, a 1o displace the crests thereof intothe troughs and c'atingcollar above the plain portion and an at 70 form a locking collar which extends around said taching portion above the collar, the diameter of unthreaded portion at the entry end of the female said plain'portion being approximatelyequal to member. ~ Í p _the effective diameter of _the threads of the shank 1 5. A threaded couplingas claimed in claim 4 portion, said socket having a threaded portion of t in jwhichft'he said locating collar.- on-Vthe male p greater length than the threaded shank of the 75 member is formed to provide a shoulder adjacent 5 2,407,741 said unthreaded portion against which the ma terial of the female member is adapted to be forced whilst said locking collar is being pro duced. 6. A threaded coupling as claimed in claim 4 in which the said locating collar on the male member is formed to provide a shoulder adjacent said Unthreaded portion against which the mate rial of the female member is adapted to be forced 6 whilst said locking collar is being produced, and wherein the unthreaded portion of the male member lies between the threaded portion thereof and said shoulder. » 7. A threaded coupling as claimed in claim 4 in which the female member is formed 0f a ma terial which is more readily deformable than the material of the male member. WILLIAM THOMAS GO-ODBY.