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Патент USA US2407929

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Sept 17, 1946' 4
2,407,928 I‘
Filed 001:. '30, 1941
~ BY
_- 14 “($1,
Patented Sept. 17, 1946
Grosse ‘Pointe, and
Alexander .G. ,Herreshoff, Mich,
‘assignors to
Wade Lamb, Detroit,
Chrysler Corporation, Highland Park, Mich, *a
. corporation of ' Delaware
Application ,October 30, 1941, Serial No. 417,171
~9‘Claims. (Cl. 85-1)
‘This ‘invention .relates to fastening or securing
devices ‘for connecting vtogether component parts
oflmachines, machine elements, or other struc
An object of our inventioniis to provide a rela
'tively simple and effective fastening device ca
lustrate the complete assembly. A bolt C extends
through openings l4 and I5 and has a pilot :por
tion .11 engaging portions of openings ht, l5
adjacent the ‘face ‘engagement of ‘cap B with rod
portion Aas at l8.
At one end each "bolt Chas a head l8 seated
at abutment 19 formed on the ‘upper end of a
boss l3’, this ‘bolt .head having a lateral ?nger
2U projecting into the groove 2| of portion A
pable to taking ‘high stresseslin securing .theparts
together and in maintaining ‘them in predeter
mined assembled relationship.
thereby allowing ready installation of bolt C
Another object is ‘to {provide ,a ‘threaded fas 10 downwardly but'holding ‘the bolt ‘against rotation
tener‘of the nut and bolt type wherein the load
in either direction.
' ‘
at the threads is eiiioiently distributedto ‘ prevent
The loweruend portion of opening ‘I5 is formed
objectionable ‘stress ‘concentrations.
with a frusto-con'ical portion 22 which ‘extends
Aiurther objectlis ‘to provide a ‘fastening de
downwardly and outwardly‘to merge withasec
vice having a relativelysimple and effective look .15 ond frusto-conical portion 23 of a wider cone
ing means ‘for maintaining the parts ‘in assem
angle andadapted to provide aseat for a, corre
bled relationship against danger of the ‘fastening
spondingly formed ‘portion 24 of a‘nut D. The
device releasing its connection.
An additional object is to provide an improved
lower end of bolt C is threaded at ‘25 'alongZa
type adapted 'to accommodate stressing of ‘the
downwardly beyond opening 15.
‘The nut ,D has threaded engagement with bolt
portion which extends both into the opening 15
locking means for a fastener of the nut and bolt 20 withinthe frusto-conical portions 22, 23 andialso
‘bolt within close limits and maintainingsuchre
lationship without danger of the fastening de
vicereleas‘ing‘its hold ‘on the parts fastened to
Further objects and advantages reside in the
novel combination and arrangement of parts as
threads .25 and is vformed with a irusto-conical
upper end'portion 25 which extends'inwardlyibe
'yond-seatfzli so as to extend with clearance at 26’
along and within portion 22. The lower .end por
tion of thenut‘D has'its outer .side'bounding‘wall
more particularly “hereinafter described and
formed .with a circumferential ,series of relative
claimed,:referenc_e beingihad to the accompany 30 ly .?ne contiguously arrangedexterna'l serrations
ing drawing in ,which:
2] ‘projecting radially outwardly ‘therefrom for
Fig. 1‘Jis afront elevational view of aconnect
engagement with similar serrations formed in
ing rod assembly showing our fastening device
applied thereto.
‘Fig. 2 ‘is an enlarged sectional view of apor
tion of the Fig. 1 connecting rodtaken .to'illus
trate our fastening device.
Fig. 3 is abottom plan view illustrating ‘the
locking means, the view being taken as ‘indicated
byline 3-—3 of Fig-'2.
ternally on the axially extending side wall of a
cupped locking cap E.
The .cap ‘E overlies the lower end of .nut .D
by a portion'formed ‘with an opening 28 to ac
rcommodate projection therethrough of the re
duced-end 29 of .bolt C. Cap E is provided with
a stiffener ?ange 3i! elongated laterally at one
point to provide a finger ill of such width .oir
cumferentially as ‘to ‘always enable it to enter
Fig. 4.15 a top plan ‘View taken as ‘indicated-by
line 4-4 of Fig. 1.
a downwardly open groove or recess‘32in assem
‘Referring to the drawing we have illustrated
the cap on serrations .21' which serrations
our invention as applied to ‘an aircraft engine
are-oi lsuch spacing relative to the widths of re
connecting rod having _a main body .portion A
and bearing cap'B. The portion A‘has the usual 45 cess 32 and ?nger 3| so as to enable assembly
of the ‘cap irrespective of the relative positions
piston pin bearing portion “Ill atone end and the
rotatably between nut 13 andreoessitz’.
half-bearing portion H at the other end ‘for
The bolt end "29 has a transverse opening there
receiving the crankshaft throw. .A companion
through to receive .a cotter :pin 33 to lockthe
half-‘bearing I2 is formed in cap l'3,1it being
cap in position, one end portion 34 of this pin
desired to tightly assemble the cap and portion
being Ebent upwardly'to lie ‘along the cylindrical
Atogether as illustrated in Fig.‘ 1.
‘The portion A is provided with bosses I3’ each
‘wall portion of ‘cap‘E ‘toward flange '3!) while the
having an opening ‘I 4 *therethrou'gh ‘in "alignment
other end portion 35 is return-bent around the
with an opening I5 extending through /a boss l6
end of bolt portion 29.
of cap B. As ‘the two jfastening devices are 55
'In ‘use, the rodcap ‘B iis positioned in place with
identical, the description of ‘one will serve to il
2,407, 928
respect to main portion A and the crankshaft
throw and bolts C applied downwardly to re
member having an opening formed with a frusto
conical seat, portion, an abutment, a tension
ceive a nut D. A wrench of appropriate design
to ?t serrations 2‘! is then applied to nuts D and
taking element extending into said opening for
seating at one end portion thereof on said abut
the desired amount of tension is placed in bolts
C, each nut, seating at 23 with self-centering ac
ment, the other end portion of said element hav
ing threads one portionof which extend for a
tion for the nuts and bolts. When the desired
distance along said element inwardly of said open
’ stress has been reached, the lock cap E is ap
plied to each nut so that its ?nger 3| projects 7 ing beyond said frusto-conical seat portion and
another portion of Which extend for a distance
into a recess 32 whereby the nuts are held in 10'~. outwardly
beyond said opening and said frusto- ‘
their positions. Then the cotter pins 33- are ap
conical seat portion, a circumferentially continu
plied and the ends 34, 35 bent into locking posi
ous nut having. threaded engagement with the
tion as illustrated. The parts _A and B are thus
threads of said element, said nut having a ?rst
securely fastened together without danger of ac
cidental disconnection or loosening although, 15 portion thereof disposed within said opening and
engaging said one portion of said threads, said
when desired, the parts may be readily disassem
By utilizing the outer annular side wall ofthe ,
nut D for serrated connection with cap E, a large
nut having a second portion engaging said an
portion of said threads, said nut having a
,frusto-conical seating portion intermediate its
number of serrations of simple ?uted formation 20 said ?rst'and second portions adapted to seat on
the frusto-conical seat portion of said reaction
is accommodated thereby enabling locking con
nection between the nut and cap for very small
increments of rotation of nut D on bolt C. Where
it is desired to stress the bolt C within very close
limits, as required in aircraft engine practice, our
invention provides a means for locking the nut
D when adjusted to very close limits .of rotation
' with resulting stressing of the bolt" to'lexac'ting
r .
Heretofore, with conventional designs, there
has beena tendency for the threads of the nut
taking member such that said ?rst and second
portions of said nut extend in opposite direc
tions beyond said seat portion of said opening.
2. In a fastening device according to claim 1,
said nut. ?rst portion being, spaced Within said
opening and externally tapered .so as to provide
progressively diminishing wall thickness thereof
in a direction inwardly. of said opening from the
frusto-conical seating portion of said nut.‘
3. In a'fastening device‘ according to claim 1,
adjacent its seat to crowd into the bolt and un
said nut ?rst, portion being'spaced with appre
duly concentrate the load in such vicinity, there
ciable clearance within said opening. .
the nut body portion.
seat portion, an abutment, a. tension-taking ele
ment extending into said openingforseating at one
4. In a fastening,‘ device, a reaction-taking
by resulting in failures in the material especially 7
V at the juncture of the nut seating portion with 35 member haying an opening formed with a ?ared
, With our arrangement,
the nut portion 26 is to some extent unloaded by
end portion thereof on said abutment, the other
expand outwardly from
end portion of said element having threads one por
its threads,’ this action being produced as an
incident to forcing the nut on the reaction-taking 40 tion of which extend for a distance along said
element inwardly of said opening beyond said
. conical seat 23, and by making the portion 26
?ared seat portion and another portion of which
of suitable'reduced wall thickness, along with pro
extend for a distance outwardly beyond said open
vidingeclearance at 26'. Furthermore, the lines
ing and said ?ared seat portion, a circumferen~
of force do not concentrate at the region 36 but.
tially continuous nut having threaded engage
instead extend somewhat spaced between seat
ment with the threads of said element, said‘nut
24 andv the threads Within nut portion 26, the
having a ?rst portion thereof disposed with ap
taper of portion 26 being such that its thickness
preciable. clearance within said opening and en,
diminishes toward its upper end where progres
sively less lines of force need to be accommodated, , gaging said one portion of said threads, said nut
or where progressively less strength of the nut '7 having a second portion engaging said another
portion of said threads, said nut having a ?ared
is needed. Further, our arrangement is such as
. allowing this portion to
, seating portion intermediate itssaid ?rst and
second portions adapted to seat on the ?ared
to approximately uniformly load the nut threads
along the length of the nut.
seat portion of said reaction-taking member, said
Our fastening means may, of course, be em
?ared seating portions being complementary with
ployed to assemble parts of structures other than
the connecting rod parts shownfor purposes of
illustrating the principles of our invention. All
references to terminology of position such as is
used in our speci?cation and claims is used in a. ‘
relative sense as obviously the fastening device
5. In a fastening device, a ?rst member hav
ing a portion thereof formed with an opening
bounded at one end thereof by an abutment, a
second member having a portion thereof formed
with an opening aligned with the aforesaid open
ing and having a ?ared seating portion, a bolt
may extend in the opposite or any other direction
from that illustrated.
extending through said openings and, having vone
If desired, the companion seating surfaces 23,
end thereof seated on said abutment, said bolt
24 may be mating parts of spherical surfaces in
stead of frusto-conical although the latter ar 65 having threads formed adjacent its opposite end, _
and a circumferentially continuous nut having a
rangement is'preferred from the standpoints of
portion intermediate its length ?ared complemen
_manufacture and stress characteristics. In either
tary with and adapted for seating on the ?ared
event the opening l5 may be said to be provided
seating portion of said second member, said nut
with a ?ared seating portion as at 23 and the
having inner and outer end portions thereof re
seating portions of the nut D and opening l5
are complementary with each other in the sense
that they are identically ?ared so as to provide
spectively projecting in,v opposite directions from
said intermediate ?ared portion and‘formed with '
threads engaging the threads of said bolt where
the desired seating area.
We claim:
by said bolt may be tensioned by said nut, said
1. In ‘a fastening device, a reaction-taking 75 inner end portion of said nut being spaced with
in the opening of said secondmember such that
the threads of the inner end portion of said nut
are approximately uniformly loaded when said
bolt is tensioned by said nut.
6. In a fastening device, a reaction-taking
member provided with a recess, an abutment, a
said bolt thereby to fasten said members together,
said nut having an annular side wall portion
thereof formed with a circumferential series of
contiguously disposed serrations extending in the
direction of the axis of said bolt, and a locking
element engaging said serrations and having a
portion thereof projecting into said recess there
tension-taking element seated at one end there
of on said abutment and having a portion adja
by to prevent undesired rotation of said nut rel
cent its other end threaded, a nut engaging said
ative to said second member and bolt.
threads and adapted to seat on said reaction
9. In a fastening device, a reaction-taking
taking member for tensioning said element, said 10 member, an abutment, a tension-taking element
nut having an externally serrated annular side
seated at one end thereof on said abutment and
wall adjacent an end portion thereof, and a look
having a. portion adjacent its other end thread
ing cap cupped for receiving the end portion of
ed, means carried by said one end of said ele
said nut, said cap having a ?nger projecting there
ment for holding said element against rotation
from for entering said recess, said cap having
relative to said abutment, a nut comprising a body
an annular wall portion internally serrated for
having an opening extending axially there
engagement with the serrations of said nut, said
through and provided with threads engaging the
?nger and recess being so constructed and ar
aforesaid threads, said body having a portion
ranged as to maintain said nut against rotative
adapted to seat on said member for tensioning
movement with respect to said reaction-taking
said element, said body having ‘an outer circume
ferentially extending side bounding wall adja
7. In a fastening device according to claim 6,
cent an end portion‘ thereof, said wall being
said tension-taking element having its said other
formed with an annular series of contiguously ar
end formed with an opening extending trans
ranged serrations projecting radially outwardly,
versely therethrough, said cap having an open 25 therefrom, and a cupped locking cap comprising
ing through which the last said end of said ele
a portion extending transversely of said element’
ment projects, and a retaining pin engaging said
and formed with an opening axially therethrough 7
opening and disposed to hold said cap in position
through which said other end of said element
projects, said cap having an annular side wall
on said nut.
8. In a fastening device, a ?rst member hav
extending from its said ?rst portion in a direc
ing a portion thereof formed with an opening and
tion axially of said cap opening for receiving
bounded at one end thereof by, an abutment,
therewithin the said end portion of said nut body,
said member being formed with a recess adja
said annular side wall of said cap being formed
cent said opening, a second member having a
with an annular series of contiguously arranged
portion thereof formed with an opening aligned
with the aforesaid opening, a bolt extending
through said openings and having one end there
of seated on said abutment, means for locking
serrations projecting radially inwardly therefrom
for engagement with the serrations of said nut
thereby to non-rotatably connect said nut with .
said cap, and means for anchoring said cap
said bolt with one of said members so as to pre
against rotation.
vent rotation of the bolt relative to each of said 40
members, said bolt having a portion adjacent its
other end threaded, a nut engaging said threads
and seated on said second member for tensioning
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