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Патент USA US2405424

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A. G. HERRESHOFF
FASTENING DEVICE
Filed July 6, 1942
INV'ENTOR
ALEXANDER G. HERRESHOFF
.
‘w’ Azpféas
BY
W
M
“
_
‘Patented Aug. 6, 1946
2,405,424
UNITED STATES PATENT’ OFFICE
FASTENING DEVICE
‘Alexander G. Herreshoif, Grosse Pointe, Mich...
assignor to ‘Chrysler Corporation, Highland
Park, Mich., a corporation of Delaware
Application. July 6, 1942, Serial No. 449,868
5 Claims.
(01.151-29)
2
,
_ This invention relates to fastening or secur
trated in Fig. 1 by utilizing body A as an abutment
in'g devices for connecting together component
and cap B as a reaction-taking member.
parts of machines, machine elements, or other
structures. My invention is especially advan
The portion A is provided with bosses l3 each
‘ having an opening l4 therethrough in alignment
with an opening [5 extending through a boss iii
of cap B. A bolt C extends through openings it
and I5 and has an intermediate pilot portion ll
tageous for connecting together the bearing por
tions of an engine connecting rod, especially for
aircraft engines wherein it is desired to stress
engaging portions of openings 14 and 15 adjacent
the connecting rod bolts a relatively great amount
the vface engagement of cap B with rod portion A
and to an exacting specification.
,
‘A vfurther object is to provide a ‘fastening de 10 as at l8. ~
At its upper end each bolt C has an enlarged
vice having a relatively simple and effective look
annular head portion leseated at abutment 29
ing means for maintaining the parts in assembled
formed on the upper end of boss i3, this bolt
relationship against danger of the fastening de
vice. releasing , its. connection. .
head having integrally ‘therewith an annular lug
I
Another object is to provide an improved fas
tening device which is capable of assembly in lo
cations where there is little room for the oper
ator.., For example, in the assembly of connecting
rods of’ai'rcraft engines my device is adapted for
15 2| upstanding from the upper face of the bolt
with other devices requiring the assembly of parts
in a direction transversely of the connecting rod.
ing portion of the lug 2! thereby, allowing ready
installation of bolt C axially downwardly but
holding thebolt against rotation in either direc
head and arranged to laterally overhang the same
at one point or region in the periphery of the
bolt head, the lug 2| being of much less diam
eter thanthe bolt head. The lug 2| projects into
assembly in a direction axially- of the connect 20 the groove 22 of portion A, this groove having an
arcuate formation to ?t the side of the overhang
ing rod where access is relatively easy in' contrast
l. An additional object is to provide a fastening
device which is freefrom parts tending to vibrate 2.5
or shake loose when subjected to use such as in
conjunction with bearing caps of engine connect
ing'rods.
.
a
'
’
Further objects and advantages reside in the
novel combination and arrangement of parts
more _ particularly’ hereinafter
described
and
claimedreference being had to the accompany
tion.
,
The lower end portion of opening 15 is formed
,with- a frusto-conical seat 23 for a correspond
ingly' formed seat portion of a nut D which is in
ternally threaded at 24 to fit the threads 25 on
the lower end of bolt C. The upper end portion
' of nut D projects, preferably with clearance;
into the lower end of opening l5 and has an annu
lar body portion 26 extending downwardly from
the ‘seat, portion to the annular planar end face
ing rod assembly showing my fastening device ap 35 21. Adjacent this face the body portion 26 has
an annular side wall which is formed externally
plied'thereto.
with an annular series of contiguously disposed
. Fig. 2 isan enlarged sectional view of a portion
axially extending ?utes or serrations 21’. These
of the Fig. 1 connecting rod taken to illustrate
ing drawing in which:
..
'Fig. 1 is a front 'elevational view of a, connect
serrations are very ?ne in the sense that there are
a great many of them arranged closely together 7
.40
'. Fig. 3 is-a top‘ plan view taken as indicated
so as to obtain a very sensitive Vernier-like look
by line 3—3 ofFig. 2.
1
ing adjustment ‘for tensioning bolt C.
s ‘Fig. 4 is a‘bottomplan view taken as indicated
Seated onrthe end face 21 is a locking cap E
by line 4—4 of Fig. 2.
which, for this purpose, is provided with an an
5 is anexploded'perspective view of the .45 nular body portion 28 disposed transversely of the
my fastening device.‘
~
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‘fastening elements.
bolt C and having a central opening 29 through
which the threaded end of the bolt may be free
ly extended. The cap is provided with a tongue
‘my invention as ‘applied to an aircraft engine
30 which, prior to ?nal locking assembly of the
connecting rod having a main body portion A
andfbearing cap 13., The portion A has the usual 50 whole device, extends in a direction axially of the
> bolt and is offset inwardly of the opening 29
p'istonpinbearingportion I!) at one end and a half
so asto lie in a groove 3|. This groove extends
bearing. portion 1 i at the other end for receiving
axially or the bolt 0 for a portion of the threaded
the crankshaft throw. A companion half-bearing
length thereof and is open at the bottom or
I2; isgformed in cap ‘B, it being desired to tightly
assemble the cap‘and portion A together as illus 55 threaded end of the bolt so as to readily receive
Referring to the drawings I have illustrated
2,405,424
3
4
the tongue 38 when the cap E is assembled. This
cap is provided with an axially extending annu
position rather than into face engagement with
one of the segments 35. This securely holds the
nut F and facilitates bending the tongue back
to its original position when it is desired to dis
assemble the parts. or course, the 45° bending
lar ?ange 32 which projects upwardly at right
angles from the periphery of the annular body
portion 23, the ?ange overlying the lower end p01’
tion of nut D and being internally formed with
is not important as any angle of bending is sat
flutes or serrations 33 complemental withthe ser
isfactory as long as the tongue overlies the edge
rations 2?’. Thus serrations 33 are equal in num
of one of the segments'35. By appropriately pro
ber to serrations 2?’ and similarly directed so
portioning the parts, the tongue 30 may be made
that the serrations of cap E will. fit the serrations ‘to project slightly beyond slot 3|, when nut F
of nut D and provide Very small increments oi‘ '
is assembled, so as to facilitate the bending over
locking rotatable adjustment between these parts.
Below or outwardly of the cap E, I provide-a 1
second nut F in the form “of a locking member.
In the present instance I employ a well-known ,
commercial type of nut lock known in the trade
as Palnut. This nut F comprises an axially per
' of the tongue as indicated by the dotted line
showing of the tongue in Fig. 2. However, this
is not entirelynecessary as the tongue may be
formed soas; to be spaced outwardly from the
‘bottom of groove 3| when assembled, thereby ac
eominodating ready access by any suitable tool for
bending the tongue into locking position. Tongue
forated transverse body of dished formation have
ing a plurality of oircumferentially spaced radial
ly extending kerfs or slots 34 forming-the dished
spring wings or body-segments 35. 'These wings
dental backing o?'from its desiredlockingiposh
are of progressive thread-like curvature and of
tion. It will be "understood thateach ofthe il
38 servesto prevent rotation of cap E relative
to the bolt and .to lock 'thenut F against. acci
such radial length such that thenut F will ‘re
lustratedlocking devicesiis assembled in the gen
ceive the boltthread 25. The outer margin ‘of
eralmanneras outlined above.
,
the nut-slotted body is struck downwardly inza 25
My .fastening means may, of course, be em
'direction oppositely to thatlof the ?ange .32 to
ployed to assemble parts of structures other than
form ‘a non-cylindrical?ange .36. Usually ‘the
connecting rodparts. ‘However, my invention is
nut F has its ?ange formed by six .?at portions
particularly adapted for connecting rod bearing
for convenient engagement by a wrench employed
cap assemblies, especially for aircraft engines, as
all parts of thefas'tening device are assembled in
to In
turnthenut.
assembling1 my
I
locking device,
.. . . ‘the '.parts
r,
A.
and Bare assembled with thefbolts cpositioned
as illustrated. Each-boltis held against rotation
by reason of the lug and groove look at 21,22‘.
Then the nut D is threaded on the‘bciltC ‘and
engaged at seat 23.- The serrations?!’ provide
means for‘engaging nutD by a suitable wrench.
The nut D is then turned until thedesired amount
afdirection'axia'lly of'the bolt C. Space limita
tions do not conveniently accommodate ‘the as:
sembly of parts'in a'direction transverse to the
axis of bolt C. Furthermore, there areno parts
to shakelooseor to vibrate under the severe. ac
tion of the connection rod.
7
_
I .
_ All references .to terminology of position, such
as is used in'my speci?cation and claims, is em
ployed in a relativesense for convenience and
understood that-both of the nuts D are tensioned 40 clarity of expression as obviously the fastening de
preferably by alternate increments of rotation
vice may extend in any direction other "than that
so that their action isbalanced during the assem
bly of the econnectingrod as a whole.
.
a
>
_ By arranging the upper end portion ‘of nut D
Then the cap E is inserted over the threaded
withqclearancein the opening I75, the stresses
of‘ tension stress is imparted" to vbolt C, it'being
illustrated.
V
.
r
.
end ,ofvthe bolt 1C, the body. portion .28 engaging 45 arising fromv seating the nut ‘at the frusto-conical
the nut face.” and the tongue 38 sliding viii-the
seat 23 tendtoequalize along the length of- the
threads of the nut thereby ‘avoiding tenden'cyfto
groove 3| until serrations-33interlocklwith serra
tions‘?'. In-theevent that theseserrations do
unduly stress these threads at the upper 'end‘p'or
not engagingly alignthen’thehdt D‘ is given ,a
slight rotation. Injno instance will it be neces
vtion of the nut. v
>
.f
5
The speci?c anchoring means shown at'jthe
sary to rotate'thenut D more thanhalf the .an
upper end of the .bolt is further illustrated and
gular distance between ‘a pair ofcontiguous ,ser
claimed in the copending application of John‘P.
rations. rBy forming the serrations very ?ne,
Butter?eld, Serial No. 449,867, ?led July 6, 1942.
as illustrated, the desired closelspeci?cation for
tensioning bolt C may be preserved within ex 55
1.‘In a locking device for a plurality of mem
tremely close limits. Cap E and .nutD are thus
bers, a ‘bolt having a threaded portion and an
Iclaim:
locked together against relative rotation. I
y
,
'_
,
.
'
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~
axial slot in thethreaded portion, a nut adapted
After cap Bis-positioned in place as aforesaid,
to engage‘the threaded portion "of the bolt ‘and
the nutv F is ‘assembled by threading the same
having axially extending raised portions entirely
on the lower end of the bolt C. When ‘the nut]?
about the periphery, ‘a cap havingraised portions
engages the body’portion 28 ofcap E, then the
entirely about an inner surface -.adapted to en
nut F ‘cannot move further axially but by fur
gage the raised portions of 'the‘nutso .a‘s'to pre
ther rotation of nut F'the dished wings 35 will
vent relative rotation of the'nut ‘and the .capand
be sprung so as to follow the threads .2‘! and ‘in
to permit relative axial movement and‘alsohav
so doing "the wings will be forced .ltoqlose some of 65 ing a tongue adapted to project .into the axial
their dished-formationrand to biteinto the threads
slot of the-bolt to prevent relativearotation of
25 thereby securely locking cap'E against axial
the cap and the bolt, and .a locking member
adapted to be engaged by the tongue of the cap
g‘After inut F is positioned in looking relation (as
so as to be prevented from rotating with respect
aforesaid, the tongue 30 is ‘bent outwardly and 70 to the bolt and having a body portion deformable
inwardly so as to engage one of the segments 35
into very, tight engagement with the threaded
displacement.
-
~
.
ofznutF and'in this manner it will beimp'ossible
.for nutFto accidentally back off ‘the‘threads 25
or even to loosen its locking grip. ' By ‘preference
the tongue '30 is bent about 45° from its Fig. 5 "
portion by rotation of the locking member ‘against
theicap.v
;
‘
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.
2, 'ZInja. fastening device fora ‘plurality of mem
here, one of ‘the members having'an abutment,
‘2,405,424
5
6
and another of the members having a seat; a ten
sion-taking bolt having a head adjacent one end.”
thereof adapted to engage said abutment and
having a portion adjacent its other end thread
ed, said threaded end portion of said bolt being
the serrations of said nut thereby to lock said
cap and nut together against relative rotation,
formed with a slot extending in a direction ax
be adapted for locking relationship with said lock
a locking element threaded to engage said bolt
threads and to be seated on said cap, said cap
having a tongue projecting therefrom so as to
ing element, said tongue having a'portion thereof
ially of said bolt, a nut threaded to engage said
adapted to be disposed in said bolt slot thereby
threaded bolt portion and having a portion
to prevent rotation of said cap relative to said
thereof adapted to engage said seat for tensioning
said bolt thereby to fasten said members together, 10 bolt.
4. In a locking device for a plurality of mem
said nut having adjacent an end face thereof an
bers, a bolt having a threaded portion and an
annular side wall portion thereof formed exter
axial slot in the threaded portion, a nut adapted
nally with a circumferential series of contiguous
to engage the threaded portion of the bolt, a
ly disposed serrations extending in the direction
of the axis of said bolt, a cap having an annular 15 cap having a portion adapted to engage the bolt
slot to prevent relative rotation of the cap with
body portion adapted to pass over the threaded
respect to the bolt, said nut and cap having in
end portion of said bolt and adapted, when as
terengaging portions preventing relative rotation
sembled on said bolt, to seat on the said end face
but permitting relative axial movement, and a
of said nut, said cap having an axially extending
annular ?ange adapted to overlie an end por- 20 locking member adapted to engage the threaded
portion of the bolt and to prevent axial move_
tion of said nut and formed internally with a
ment of the cap and to be engaged by the said
circumferential series of contiguously disposed
portion of the cap so as to be prevented from
serrations for engagement with the said serra
rotating with respect to the bolt.
tions of said nut, said cap having a tongue pro
jecting from its said body portion adjacent the 25 5. In a locking device for a plurality of mem
aperture thereof and adapted, when said cap is ‘ bers, a bolt having a threaded portion and an
axial slot in the threaded portion, a nut adapted '
assembled on said bolt as aforesaid, to lie in said'
to engage the threaded portion of the bolt and
bolt slot and extend from said cap body portion
having axially extending raised portions entirely
in a direction axially of said bolt toward said
other end of said bolt, a lock nut adapted to seat 30 about the periphery, a cap having raised portions
entirely about an inner surface adapted to en
on the said cap body portion, said lock nut hav
gage the raised portions of the nut so as to pre
ing a deformable body portion apertured for vent relative rotation of the nut and the cap and
threadedly engaging the threads of said bolt and
to permit relative axial movement and also hav
adapted to be deformed into springing locking
engagement with said bolt threads when said 35 ing a tongue adapted to project into the axial
slot of the bolt to prevent relative rotation of
lock nut is turned on said bolt after being seated
the cap and the bolt, and a locking member hav
on said cap, said tongue adapted to be bent out
ing a dished portion deformable into very tight
wardly from said bolt slot so as to overlie the
engagement with the threaded portion of the
said body portion of said lock nut‘
3. In a locking device for tensioning a bolt of 40 ‘bolt by straightening of the dished portion caused
by rotation of the locking member against the
the type adapted to fasten together bearing parts
cap, the tongue on the cap having a portion bend
of a connecting rod, said bolt having a threaded
able outward so as to engage the locking meme
end portion provided with a slot, a serrated nut
her for preventing rotation of the same with re
threaded to engage said bolt threads and to bear
against one of said parts for tensioning said bolt, 45 spect to the bolt.
a cap apertured to receive said bolt end portion
and having a portion thereof serrated to engage
ALEXANDER G. HERRES‘HOFF.
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