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Патент USA US2407742

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Sept» R17, 1946.
w. T. GooDBY
2,407,741Í
SCREW-THREADED MEMBER
Filed' April 6,A 1944
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Patented Sept. 17, 1946
2,407,741
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PATENT
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OFFICE
»2,407,741
SCREW-THREAD@ MEMBER
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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?`
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Great BritainApril 2, 1943
7 ciaims. (o1. rs1-22')
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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.
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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
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.
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.
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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:
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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,
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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
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is approximately-one-flfththereof, and a recessed
portion 15‘ whose diameter i's-«slightl'y greater
allori/ii
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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.
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to »the effective diameter» of the threads _of the
shank portior'n'the diameter oi said locating collar
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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!
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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
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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.
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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.
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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
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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,
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member.
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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.
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_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
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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
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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.
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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.
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