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Патент USA US2407587

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Sept. 10, 1946.
O. M. SUMMERS
2,407,586
2,407,586
Patentecl Sept. 10, 1946
UNITED STATES PATENT orrrcr.
2‚407‚586
STRESS-FREE STUD
Otto M. Summers, Mount Gileed, Ohio, assignor
to H-P-M Development Corporation, Wilming- ‚
ton, Del, a‚ corporation of Delaware
Applieation February 16, 1944, Serial No. 522,536
12 Claims. (Cl. 151-32)
1
This invention relates to studs and the mem
ber in which they are mounted so as to distribute
the stress applied upon the stud substantially
uniformly throughout the threaded iength there
of. The invention partioulariy re1ates to highly
be readily removed Írom the tapped hole with
reiatively litt1e effort.
‘
Stil1 another object of the invention is to pro‘
vide a relativeiy stress free stua mounting ar
rangement Wherein the threaded portion of the
stud may be termed undersize Írom standard.
thread practice design for threading into a
prestressed studs that are loaded to the maxi
tapped hole that is of standard size according
murn stress condìtion that wi11 normally be re
to thread practice design, so that the stud can
ceived by the stud under any conditions that in
be free1y threaded into the threaded hole which
10
’?uence the operating mechanisms held by the
receives the Same and resilient means is provided
for frictionaliy engaging the threads of the stud
studs.
‘
One of the major di?ìculties with studs of
wìth the threads of the hole in whích it is re
’ stressed studs, of which one cla-ss is ‘Ä?OWI1 as
the conventional type that are provided with
ceived for thereby preventing removal of the
standard threads and are adapted to be threaded
stud from the hole unless a relatively high torque
into t’apped holes is that the stress appiied to 15 eiïort is appiied upon the stud.
the stud to tighten the same in the hole causes
Stii1 anothe‘r object of the invention is to pro
‘a loca.1ized stress in the stud that is loc‘ated just
Vide a, stud with an undersize threeded body por
tion that is inserted in a standard size tapped
b’elow the thread line.
‘
In order to re1ieve localized stresses in sinds
hole and the resilient washer causes frictional en
20
it has been suggested to provide as neer 109%
gagement of the stud threa‘d’s with the hole
thread contact of the stud with the threads in
threads to prevent remova1 of the stud from the
the tapped hole for the same as possible, tend
hole.
ing to distribute the stress load over as great a
A sti1l further object of the invention is to
number of thre_ads as p‘ossîbie, or to provide
provide a stud in eccordance with any of the’
special thread designs, er toprovide shoulders 25 foregoìng objeots wherein the stress ioad a‚pplied
on the studs that are brought into engagement
upon the stud is distributed over substantially
with the member in which the stud is supported
the entire thread iength thereof without cauäing
sò as to appr‘oagh the stress conditions developed
any looelization of stresses at the thread line
in the ordinary cap screw. A11 of these prior
of the stud.
‘
developments are "more or 1ess centered aro’und 30
Fnrther objects and advantages wi11 become
the ‘maintenance of accurately ‘dimensioned
apparent from the drawing and the f_oilowîng
thr‘eads on the stud and in the hole to receive
description.
the‘ seme so as to obtain as neer as possib1e en
In the drawings:
aC’curate axial aligmnent of the stu‘d in the hole
Figure 1 is a‚ vertical cross-sectîonal view of a
ahd thereby reiieve any angular stresses set up 35 meohanism illustrating the use of the stud of this
in the stug1 when it is used to secure one object
invention Íor securing mernbers together.
Fìgure 2 is ‚a, cross-seetional view illustrating
upon ariothe’r.
‘
‘ An object of this iùvention is to provide a
stud that can be positioned in a, standard tapped
hole so that looaiized stresses in the stud are sub
stantiaily eliminated.
the marmer of mounting a stud accordìng to con
40
ventional practice.
Figure 3 is a‚ cross-sectional view of a portio‘n
of a stud similar to that illustrated in Fìgure 1
‘out showing a, slightiy modi?ed arrangement
thereoí.
Fìgure 4 is a, cross-sectionai view showing a‚
ject wherein the stud is threaded into the tapped 45
modi?ed
arrangement for obtaining en axia1
hole in a relatively free, or ?oating, condìtion so
forse upon the stud of this invention by means
thet but siight etîort is required for this opera
of a, plug of rubber-like material.
tion, and wherein means is assocîated with the
Aecording to what may be termed conventional
stud which ceuses all of the threads, of the stud
stud mounting practice, as iilustrated in Figure 2,
Stii1 another object of the invention is to pro
vide a stud in eccordance with the Íoregoìng ob
to iricti'cmaily engege the threads of the tapp‘ed 50 a stud body 10 is provided With a, thre‘aded end
hole in Which the stud is placed for holding the
H thereon that is received in a, threa.ded hole 12
Same in the hole in iocked condition therein in
of any suitable mounting member l3. In cutting
a ‘marmer that a reiativeiy high torque ei‘fort is
the threads l l en the stud body In the maximum
required to inîtially release the stud from the
diameter of the threaded portion is substentialiy
55
tapped hole, but which when on<ìe released aan
2,407,586
3
4
the same as the diameter of the stud body, and
are out to tolerances allowed by standard thread
practice. The threaded hole l2 is also tapped
21 and the sharp corners of the chamfer are bro
ken. By providing the stud 20 with an undercut
portion 26 the axial thrust or stress produced in\
the stud 20 is transmîttecl into the threaded por
tion of the stud a substantial distance away from
the min'or or root diameter of ‚the threads and
with the threads‚therein according to standard
thread practice so that When the threaded end l l
of the stud is inserted’in the, threads of the hole
I2 there will be a, certainamount of friotion de-‚
thus relieveslocalized stress, ‚
_ _ ’
veloped therebetween when the stud ID is thread
The lower end portion 28 of thebody U of the
ed into place. When the thread line of the stud
|0 reaches the top of the threaded hole i2 it may lU stud 20 is slightly smaller than the minor or root
diameter of the thread 22 and engages a spring
then be tightened by suitable degree of torque
washer 29 located in the bottom of the hole 24.
being applied thereon. It has been found in
The spring washer, or look washer 29, is prefer
practice that when studs are ìnserted into a sup
porting member in this manner that the threaded
portion of the stud becomes highly stressed just ‚
below the thread line of the stud, generally one
or two threads below the thread line. This is
ab1y provided with rounded or chamfered ‘cor-’
ners 30 to prevent the same from digging into the
end of the stud 20 and producing shavings whích
may in some Way get into the ‚mechanism that is
being assembled by the use of the studs.
probably caused by the degree of misalignment
The upper end 3| of the stud 20 may be pro
between the threads on the stud and the threads
in the supporting member, and by the stress set 20 vided with threads 32 produced according to
standard thread practice to receive a nut 33 that
119 by the thread line shoulder en the ‚stud en
is threaded according to standard practice to be
gaging the angular surfaces of the threads in
placed upon the threads 32.‚ The nùt 33 secures
the hole whích tend to throw the body of the
any desired member 34 upon the member 25, and
stud ahgularly relatively to the axis of the hole.”
a suitable metal gasket 35 may be‚ positioned
When studs of this nature are placed under a
therebetween if desired.
"
When the stud 20 is to be assembled upon the ’
highly stressed condition’and particularly when
-the stress is of a cyclic nature, the studs tend ‘to
member 25, the spring look washer 29 is placed
fatigue and crack just below the thread line.
in the hole 24 and then the threads’22 of the
stud 20 are threaded into and received by the
curately size the threads on the stud as well as
‚the threads in the hole whichreceives‘ the same 30 threads 23 in the hole 24. When the stud 20 is
The attempts of correction have been te ~ac
being threaded downwardly into the hole 24,
‚ to provide as nearly 100% ‘contact between the
threads as _ possible.
the undersize threads 22 will thread freely in the
threads 23, and actually a slight clearance is pro
vided therebetween. This operation can usually
be performed by hand and without the use of
auxiliary tools. When the bottom portion 28 of
the stud 20 contacts ‚the spring look washer 29
This, of course, has en
tailed careful manufacturing operations and the
use of special lubricants in order‘to thread the
studs into position in their supporting members.
On the other hand, various shoulders have been
provided on the studs that were adaptêd to en
a suitable torque wrench can be applied to the
gage the surface of the supporting member tend
ing to maintain the alignment between the stud
and the hole, but even in these instances the
major load of the stress upon the stud is carried
stud 20 whereby to urge the samedownwardly
into the hole 24, forcing the end 28 against the
spring look washer 29 to 'co‘mpress thesame.
Compression of the spring look washer 29 ’urges
the upper faces of the threads 22 against the‘
by the top two orthree threads upon the.stud
in the same manner as heretofore referred 120.
lower faces of the threads 23 so that each‘and
every thread along the threaded lower end por
tion of the stud 20 engages a thread in the hole
24 by frictional contact. The threads 22 are re
tained in this position by the spring look washer
In this invention, however, the stud 20 is pro
vicled with a, body portion 2! that has the lower
end ‘thereof provided with threads 22. The
threads 22 of the stud 20 are received by the
threads 23 provided in the tapped hole 24 located
in the support member 25 whích may be any suit
CA O
»able device.
wardly.
The tapped hole 24 is ?rst drilled With a suit
able size drill to provide the lead for the tap for‘
When the stud 20 is ins'erted in the hole 24
in this manner, it will be noted that there will
29 tending’to continuously urge the stud 20 up- ‚
tapping the hole. The tap used in tapping the
hole which has been previously drilled, is a stand
ard tap for producing threads 23 in the hole 24
be no’single point of localized stress in the stud
because the looseness of the stud threads in the
threads in the hole during insertion of the stud
according to standard thread practice.
therein permits freedom of movement, or ?oat
ing movement, of the stud in the hole to permit
The threads 22 that are cut on the stud 20 are
the threads 22 to engage uniformly the threads
what may be termed undersize threads‘ accord
23 of the hole 24. It will be noted that there is
ing to standard thread practice with regard to
‘the size of the threads 23 so that ‘the threads 22 6." no localized stress at the thread line of the stud
in the manner heretofore referred to with refer
‘are a relatiVely loose ?t within ‚the threads 23.
ence to Figure 2. When the nut 33 is now applied
The threads 22 are in practice actually made suf
?ciently undersize relatively to the threads 23
that the stud 20 can be threaded freely by hand . ‘
upon the upper threaded end 32 of the stud 20
and tightened with a suitable torque wrench to
pre-stress the stud 20 to any desired degree, it
without the use of auxiliary tools. As a. general
rule the stud end thread 22 can be undersize on
will be ‚ apparent that’ the stress load carried
pitoh diameter 1/2 of 1% of‘the bar size plus .002
inch.
area of the threads 22.
The stud 20 is provided with an undercut por
tion 26 that is slightly smaller in diameter than
‚ ‘the minor or root diameter of the thread 22.
In
general this may be stated to he 3% under nor
ma1 or root diameter. The undercut portion 26
by the stud 20 will be distributed over the entire
‘‘
With the threads 22 in frictional engagement ’
with the threads 23 throughóut substantially the
entire length thereof, there is provided a rela
tively large frictional surface area of metal to
metal engagement between the stud 20 and the
is connected with the thread line by a chamfer 75 member 25 whích resists any_turning or torque
movement of the stud 20, and this frictional en
2,407,586
ga‘g’ement between the threads 22 and 23 is main
tainecl by the spring lockwasher 29 ‘so that the
nut 33 aan he applied and removed from the up
per threaded end 32 of the stud without causing
r’otation of the stud in the hole 24. In faat, in
aatual practica it has been found that the studs
may be assembled in their holes and the spring
look washer 29 aompressed with relatively com
thetia rubbers, is dropp'ecì into the tapped hole
24 and then the stud 28 is threaded into the
hole 24 in the marmer heretofore desaribecl.~ The
lower end portion 28 of the stud 2il engages the
rubber like mat‘erial and a‘ompresses the same "in
plete freedom of movement during the assembly
the lower portion of the ‘tapped hole‘ 24. The
compression of the rubber plug 5e plaaes an axial
thrust upon the stud 2âl to thereby cause engage
ment of the thi‘eadS 22 thereof with the threads
short period of time the friational contact be
tw‘een the threads2‘2 and the threads 23 beaome
viae disclosed and described h‘erein aonstitutes a
operation, and that after the studs have set in 10 23 of the tapped hole 24, in the same marmer as
heretofore described.
’
posîtion in their threaded. holes for a relatively
While the meahaniaal arrangement of the d’e
preferred form of the device, yet, it will be un-=
quired to initially release the stud to remove the 15 clerstood that it is capable of mechanical altera
tion without departing from the spirit of the in’
same :from the hole 24 than was required to place
vention, and that all suah modi?aations as fall
the same in position. However, as soon as the
within the scope of the appended claims are in-‚
static frozen aonclition between the threads ‘22
tended to be included herein.
and. 23 is broken, the stud may be rotated rela
Having thus fully described n’1‘y inventîbn what
tively freely by means of a wrenah until the end 20
I claim as new and desire to secure by Letters
portion 28 of the stud moves ùpwardly away from
Patent is:
the spring look washer 29 to relieve the forae
1. A stud fastening mèchanism that inaludes a
thereof Írom the stud 261, and subsequently the
member having a threaded hole therein, a stud
stud may be removed from the hole 24 relatively
having a thread portion thereon reoeived in the
~freely by hand.
’
threads of the threadeol hole, the alearanae be
In Figure 3 there is shown a slightly modi?ecl
tween the threacls on the threacled portion of
arrangement of the stud illustrated in Figure 1,
the stud ancl the threads in the hole beìng greater
and which may be used to adapt the use of the
than the maximum alearanae permitted be’tween
prinaiples of this invention to studs that are used
suah threads aaaording to the toleranaes allowed
’ Íor replacement in existing meahanísms.
in standard thread practica whereby the threads
In general, the stud 4il, shown in Figure 3, haV-‘
on the stud ‘are a relatively loose Íit in the threads
ing the threads 4-i thereof, is constructed in the
in the hole as gauged by stanalard thread practia‘e,
same manner as the stud 2û, illustrated in Figure
anti resilient means within the threaded. hole en
1, so that the threads 4| thereof engage the
threads 42 of the hole 43 in the member 44 in _~ gagecl ‚by ‘the stud whereby to app1y an axial force
upon the stud to aause Íriatìonal engagement be
the same m‘anner as heretofore desarîbed. How
tween one side of the threads on the stud and
ever, in‚this modi?aation the end portion 28 of
one sicìe of the threads in the hole.
the stud, as illustrated in Figure 1, is replaaed by
2. A stud Íastenìng meahanism that includes
a loose pilot member 45 that is inserted in the
a member having a threacied hole therein, a stud
hole 43 to. rest upon the spring look washer 45.
having a threacl portion thereon reaeìved in the
The pilot member 45, or plug, performs the same
threacls of the threadecl hole, the alearance be
function as the end portion 28 of the stud 2ii
tween the threads on the threaded portion of the
heretofore desaribecl.
‚
stud and the thraads of the hole exaeeding the
If it is desired to replaae ‘studs on exísting ‚ maximum alearance permitted between suah
equipment, this arrangement aan he ?ised. Also,
threads aa-aording to the tolerances allowecl by
the loose pilot ‚or plug member 45 permits the
standard. thread praatiae, whereby the threads on
use of the stud in relatively deep holes without
‘the stud are a relatively loose ?t in the threads in
the neaessity of making the pilot member integral
the hole, resílient means within the th-reacìed. hole
with the stud. The, arrangement illustrated in
engagecl by the stud whereby to apply an axial
so fgreat that a force‘ substantially grea’ter is re
Figure 3, also permits an adaptation of the prin- " force upon the stud to cause friational engage
aiples of this invention to studs that are used
ment between one side of the threacison the stud
on exîstìng equiprnent because the stuo‘ls can be
and. one side of the threads in the hole, and a
i‘ethre‘adeal to an undersi2e aonditîon comparable
body portion of said stud in J‘uxtaposition to the
of that referred to in connection with the cle
0 innermost thread of saial threaded. portion hav
saription of the stud 20 and the loose pilot mem
ing a diameter not greater than the minor or root
ber 45 ha inserted in the hole so that the com
diameter of the threads thereon to prevent local
pression of the spring look washer 46 aan per
ization of stress at the root diameter of said.
Íorm its funation upon the stud 4í3 to retain the
threads on said stud.
threads lii thereof in engagement with the
threacls 42. Also, the stud that is being reworked
aan have the shank portion thereof underaut
3. A stud fastening meahanism that includes a
member having a threaded hole th’erein, a stud
having a threac'ì portion thereon received in the
threads of the threazied hole, the aiearanae be—
in the Same marmer as the underaut portion 2â,
illustrated in Figure 1, i_t having been founcl in
practice that when the principles of this inven
’ tween the threacls on the threadecl portion of
tion are applied to studs that, as a general rule,
the diameter of the stud aan be reducecl beeause
the loealized stresses have been remoVed from
the stud.
In Figure ‘i, there is shown a modi?ecl arrange
ment Íor obtaining an angle thrust upon the i)
stud 28 to force the upper Íaaes of the threads of
‘the stud. into engagement with the 1ower faces of
the threads in the tapped hole 24. In this ar
rangement a rubber plug 59, or a plug of mate
rial of a rubber like substance, suah as the syn» 75
the stud and the threads in the hole being greater
than the maximum clearanae permitted bet‘ween
suah threads aacording to the tolerances allowed
in standard thread praatice vvhereby the threads
on the stud are a relatively loose fit in the threads
in the hole, resilient means within the threadecl
hole engaged by the stud whereby to app1y an
axial forae upon the stud to cause frictional en
gagement between one side of the threads on the
stud and one side of the threads in the hole‘,
and a body portion of said. stud in juxtaposition
2,407, 586
7
8
to’ the innermost thread of said threaded por
in the stud adjacent said body portion, said stud —
ti‘on having a diameter not greater than the
being positioned within said hole with the inner
minor or root diameter of the threads thereon
most thread on said stud disposed within said
and joined with the threaded portion of the stud
hole and below the surface of the member in
by means of a chamfered stud body portion to 5 which said hole is placed and with the body‚por
prevent localization of stress at the root diameter
tion of the stud that is in juxta;position to said
of said threads on said stud.
innermost thread‘out of contact with said mem“
’ 4. Astud fastening device that-includes, a mem
’ ber having a threaded hole thereín, a stud mem
ber, and resilient means wìthin said threaded .
hole in’said Íirst member engaged by said stud
ber having threads on an end portion thereof 10 Îor applying an axialforce thereon to cause
having a root diameter greater than the diameter
axial movement of the stud in‘ the hole to place
of the body portion of the stud in juxtaposition
one side of the threads on the stud.in frictional
to the innermost thread thereon and which are
engagement with‘ one side of. the threadsin said
unders‘ize relatively to the threads in the hole in
hole 'to thereby distrìbute the stress load on the
said ?rst member that the clearance between the 15 stud over all the threads thereof and prevent
threads of the stud and the threads in the hole
rotation thereof tending to remove the stud from
is greater than the maximum clearance permitted
between suoh threads aeoor’ding to the toleranoes
the hole.
‘
7. A stud fastening device that includes, a
‘ allowed in standard thread practice whereby a
member having a threaded hole therein, a stud
relatively loose thread ?t therebetween is pro 20 member having threads on an end portion there
vided as gauged by standard thread pràctice
of having. a root diameter greater than the di-‘
thereby preventing localization of stresses in the
ameter of the body portion of the stud in juxta
position to the innermost thread thereon and.
which are undersize relatively to ‚the threads in
threaded hole in said ?rst member engaged by 25 the hole in said iìrst member that the clearance
said stud for’ applying an axial force thereon to
between the threads of the stud and the threads
cause axial movement of the stud in the hole
in thehole is greater than the maximum clear
to place one side of the threads 011 the stud
ance permitted between such threads according
in frictional engagement with one side of the
to the tolerances allowed in standard thread
threads in said hole to thereby distrìbute the 39 practica’ whereby a‘ relatively loose thread ?t
stress load on the stud over all the threads there
therebetween is provided as gauged by standard
of and prevent rotation thereof tending to remove
thread praetice thereby preventing looalization
the stud from the hole. ’
of stresses in the stud at the ?rst thread line in
5. A stud fastening device that includes, a
the stud adjacent said body portion, resilient
member having‘ a threaded hole therein, a stud 35 means within said hole beneath said stud, and
stud at the ?rst thread line in the stud adjacent
said body portion, and resilient means within said
member having threads on an end portion there
of having a root diameter greater ‘than the cli
ameter of the body portion of the stud in juxta
a pilot member between said resilient means and
said stud whereby the expansive Íorce of said
resilient means urges said pilot member and said ‘
position to the innermost thread thereon and
stud axially to cause frictional engagement be
which are undersize relatively to the threads in 40 tween one side’of the threads on said stud and
the hole in said ?rst member that the clearance
one side of the threads_in said hole to thereby
between the threads of the stud and the threads
cause distribution of stress applied upon said
in the hole is greater than the maximum clear
stud over all the threads thereof and to prevent
ance permitted between such threads according
rotation of said stud tending to remove the same
to the tolerances allowed in standard thread 45 from said member.
practice wheréby a relatively loose thread ?t
8. A stud for receiving high axial stresses that
therebetween is provided ’as gauged by standard‚ consists of a stud body member, threads on an
thread practica thereby preventing localization
end portion of said body member that are under-‚
of ’ stresses in the stud at the ?rst thread line
size as gaugedby standardythread practica rela
in the stud adjacent said body portion, and a 50 tively to the threads of a hole that are adapted
spring look washer in said hole engaged by the
to receive the same so that the clearance be
bottom of said stud for applying‘ an axial forse
tween the stud threads and the threads in the
thereon to cause axial movement of the stud in
hole with which they cooperate is greater than
the holeto place one side of the threads on the
the maximum clearanoe permitted according to
stud in frictional engagement with one side of
the tolerances allowed in standard thread prac
the threads in said hole to thereby distribute
tice, said stud body having a portion thereof
the stress load on the stud over all the threads
adjacent the innermost thread provided with a
thereof and prevent rotation thereof tending to
jdiameter not greater than the root diameter’of
‘ remove the stud from the hole.
‘said threads, whereby said body portion will be
6. A stud fastening device thatdncludes, a 60 disposed out of engagement with the threads in
member having a threaded hole therein, a stud
a hole that is adapted to receive said stud and
member having threads on an end portion there
prevent localizati0n of’ stress in the stud at the
of having a root‘diameter greater than the di
thread line thereof. ‚
’
ameter of the body portion of the stud in juxta
9. A stud Íor receiving high axia’l stresses that
position to the innermost thread thereon and
65 consists of a stud body member, threads on an
which are undersize relatively to the threads in
end portion of said body member that are under—
the hole in said ?rst member that the clearance
size as gauged by standard thread practica rela
between the threads of the stud and the threads
tively to the threads of a hole that are adapted
in the hole is greater than the maximum clear
to receive the same so that the clearance between
ance permitted between such threads according 70 the stud threads and the threads in the hole
to the tolerances allowed in standard thread prac
with which they coopèrate is greater than the
tice whereby a relatively loose thread ?t there
maximum clearance permitted according to ‘the
‘between is provided as gauged by standard
tolerances allowed in standard thread practice, ’
thread practice thereby preventing’ localization
said stud body having a portion thereof ao‘lja
of‘ stresses inthe stud at the ?rst thread line 75 cent the innermost thread provided with a di
9
10
disposed wìthín the threaded hole and engaged
ameter not greater than the root diameter of
by
said member extending from said st-ud to com
said threadg and contiguous with said innermost
press the rubber lìke material between said ex
thread by a chamfered body portion extending
tending member and said hole to thereby apply
therebetween, whereby said body portiun Will be
disposed out of engagement with the threads in (71 an axial force upon the stud to cause irictional
engagement between one side of the threads on
a‘ hole that is adapted to receive said stud and
the stud and one side of the threads in the hole
prevent localization of stress in the stud at the
and also frictìonally resíst rotation of said stud,
thread 1íne thereof.
and a body portion on said stud in juxtaposìtion
10. A stud fastening mechanism that includes
a member having a threaded hole thereìn, a stud 10 to the innermost thread of said threaded por
tion having a diameter not greater than the
having a threaded portion thereon receìved in
minor or root diameter of the threads thereon
the clearance between the threads of the thread
to prevent localization of stress at the root di
ed hole, the threads on the threaded Dortion of
ameter of said thread on said stud.
the stud and the threacls in the hole being greater
12. A stud fastening mechanism that includes
than the maximum clearance permitted between 15
a
member having a threaded hole therein, a
such threads according to the tolerances allowed
stud having a threaded portioii thereon received
in standard thread practica whereby the threads
in the threads of the threaded hole, the Clear
on the stud are a relatively loose ?t in the threads
ance between the threads on the threadea por
in the hole as gauged by standard thread prac
tíce, a member extending from the end of said 20 tion of the stud and the threads in the hole be
ing greater than the maximum clearance permit
stud toward the bottom of said hole having a di
ted between such threads according to the tol
ameter less than that of said hole, a member of
erances allowed in standard thread practioe
rubber like materìal disposed within the thread- ‚
whereby the threads on the stud are a relatively
ed hole and engaged by said member extending
from said stud to compress the rubber like ma 25 loose ?t in the threads in the hole as gauged by
standard thread praotìce, a member extending
terial between said extending member and said
from the end of said stud toward‚the bottom of
hole to thereby apply an axial forse upon the
said hole having a diameter less than that of said
stud to cause frictional engagement betwèen one
hole,
a member of rubber like material dísposed
side of the threads on the stud and one side of
wíthin
the threa'ded hole and engaged by said
the threads in the hole and also frictionally 30
member eXtending from said stud to compress
resist rotation of said stud.
the rubber like material between said extending
11. A stud Íastening mechanism that includes
member and said hole to thereby ap;ply an axial
a member having a threaded hole therein, a
force upon the stud to cause frictional engage
stud having a threaded portion thereon received
ment between one side of the threads on the
in the threads of the threaded hole, the Clear
stud and one side of the threads in the hole and
ance between the threads on the threaded por
also frictionally resist rotatìon of said stud, and
tion of the stud and the threads in the hole being
a body portion on said stud in juxtaposition to
greater than the maximum clearance permitted
the innermost thread of said threaded portion
between such threads according to the toler
having a diameter not greater than the minor
ances allowed in standard thread practice where 40 or root diameter of the threads thereon and
by the threads on the stud are a relatively loose
joined With the threaded portion of the stud by
?t in the threads in the hole as gauged by
means of a curved stud body portion to prevent
standard thread practice, a member extending
looalization of stress at the root diameter of said
from the end of said stud toward the bottom
thread on said stud.
of said hole having a diameter less than that
OTTO M. SUMMERS.
of said hole, a member of rubber like material
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