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Патент USA US2405402

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Patented Aug. 6, 1946
2,405,402
>UNITED STATES PATE
GFFICE
2,405,402
‘SELF-LOCKING BOLT on NUT
Lionel A. Carter, Webster Groves, Mo.
Application December 27, 1943, Serial No. 515,645
13 Claims.
1
This invention relates to bolt and nut locks
and has for its principal object to provide means
integral withA the bolt or nut and adapted, when
the bolt and/or nut are tightened, to resist the
tendency to unscrew due to vibration and stresses.
The invention consists in providing at the inner
end of the screw thread of one of said bolt and
nut members a circumferential shoulder adapted,
when the nut and bolt are tightened, to axially
(ci -151--21)
`
2
of said groove corresponding to the depth of said
screw thread. The annular groove 4 has the wall
5 thereof next to the screw thread 3 disposed nor
mal to the longitudinal axis of the bolt. The
other wall B of the annular groove 4 inclines in
wardly and forwardly from the periphery of the
unthreaded portion of the shank l and meets tireV
opposite wall 5 at the bottom of the groove, the
angle of the inclined wall being less than the `
y upset the opposingend of _the screw thread of the 10 angle of the corresponding side face of the screw 1
other member from helical to annular form, and
thread 3.
thereby resist relative rotary movement of the
By the arrangement `described„the bolt A is
tightened nut and bolt members. The invention
extended through the opening in the member B
also consists in inclining-said abutment so that
and is threaded into the threaded opening 'I in
the screw thread is progressively upset from the 15 the nut or othery member C until the inclined wall
apex thereof to the base thereof, The invention . 6 of the annular groove 4 abuts against the bolt
also consists in the‘bolt and in the nut; and it
receiving end of said threaded opening, The bolt
also consists in the construction, combinations
A is then tightened with suiücient force to press
and arrangements of parts hereinafter described
the inclined wall 6 thereof endwise against the
and claimed.
»
20 bolt receiving end portion of the screw thread in
In the accompanying drawing, which forms
the hole 'l of the nut or other member C, thus
part of this specification and wherein like symbols
crowding or axially upsetting such portion of the
refer to like parts wherever they occur,
thread so that it conforms to the annular groove
Fig. 1 is a side elevational view of a bolt em
and is changed from helical to annular form.
bodying my invention, the bolt being shown in en 25 This change of the bolt receiving end of the in
gagement with two parts that are to be secured
terna] screw thread in the member C from helical
together thereby, said parts being shown in sec
to annular form in the annular groove 4 of the
tion and the bolt being shown before being tight
bolt A provides a bolt lock which eifectually pre
ened,
vents separation of the bolt and nut under all
Fig. 2 is a view similar to Fig. 1 showing the 30 stresses and vibrations except a rotary unscrew
bolt partially tightened,
Fig. 3 is a view similar to Fig. 2 showing the
bolt completely tightened,
Fig. 4 is a view similar to Fig-3 showing two
parts secured together by a bolt provided with a
nut embodying my invention,
Fig, 5 is a fragmentary side elevation of a bolt
provided with a locking means of modified form,
ing force sufficient to restore the upset portion of
the internal thread to its original helical form.
The angle of the inclined wall 6 of the annular
groove 4 is greater than the angle of the corre
spending side wall of the internal thread, wherebyl
the thread is progressively upset from its thin
apex portion to its thick base portion, thus pre
venting shearing of such thick portion.
Fig. 6 is a cross-sectional view on the line 6-6
In' the modification shown in Fig. 4, two mem
in Fig. 5; and
40 bers B', B’ are secured together by means of an
Fig. 7 is a fragmentary side elevational view of
ordinary bolt A’ and a self-locking nut C’ em
a bolt provided with another modified form of
bodying my invention. In this construction, the
locking means.
In the constructions shown in Figs. 1, 2 and 3
threaded hole ’la in the nut C’ has an annular
groove 4a formed therein at the inner end of the
of the accompanying drawing, A indicates a 45 screw thread. The internal annular groove 4a
bolt embodying my invention and B and C indi
in the nut C’ is of a depth corresponding to the
cate, respectively, the two members that are y.
depth of the internal screw thread and has the
secured together by said bolt. VAs shown in the
wall 5a adjacent to the inner end of said screw
drawing, the bolt A comprises a shank I with a
thread disposed normal to the axis thereof. The
hexagonal head 2 and an external screw thread 50 opposite wall 6a of the annular groove 4a is in
3 which extends from the entering end of said
bolt to a point short of said head. According to
clined from the top thereof to the bottom thereof
where it meets the other wall 5a. Thus, when
the present invention, the shank portion I of the
the nut B’y is tightened on the bolt xA' with suffi
bolt A has an annular groove 4 formed therein
cient torsional force, the inclined wall 6a of the
at the izmer end of the screw thread 3, the depth 55 annular groove 4a of said nut bears axially against
2,405,402
3
4. The combination of a bolt and a nut there
for, said bolt having an external screw thread
thereon and said nut having an internal screw
thread therein adapted to cooperate with said
external screw thread, said bolt having an an
nular groove therein at the inner end of the ex
ternal thread thereon, said annular groove hav
ing the wall thereof remote from said end of said
external thread inclined radially inwardly in the
direction of the other wall of said annular groove,
at the inner end of the thread 3b of the bolt A2 .
is machined to form a V-shaped rib or projection
whereby said inclined wall bears axially against
the bolt receiving end of the internal thread of
said nut to thereby upset said end from helical
9 on said wall. The rib or projection 9 is adapted,
when the bolt is tightened, to concentrate the up
setting eiîect at the contact point of said rib with
to annular form when said bolt and nut are
tightened, the angle of the inclined wall of said
the internal thread with which the bolt cooper >
ates.
4
upset the front end of said internal screw thread
when said nut and bolt are tightened.
the outer or nut receiving end of the external
thread 3a on said bolt and thus upsets or deforms
said end of said thread axially into said annular
groove, thereby firmly locking the bolt and nut
together against relative rotation. In the con
structions shown in Fig. 4 and in Figs. 1, 2 and 3,
the bolt and nut may be unlocked by torsional
stress sufficient to restore the deformed annular
portion of the thread to its original helical form.
In the modiñcation shown in Figs. 5 and. 6, the
thread upsetting wall 6b of the annular groove 4b
groove being less than that of the wall of the
-
thread engaged thereby.
In the modiñed construction shown in Fig. 7,
5. The combination of a bolt and a nut there
the bolt A3 is formed at the trailing end of the 20
for, said bolt having an external screw thread- and
screw thread 3c with a short thread l0 in the form
of a reverse helix adapted tc concentrate the up
said nut having an internal screw threadV adapted
to cooperate with said external screw thread, said
nut having, at the rear end of the thread thereof
settingM elîect by a faster rapproach of the sides
of the reversed helical thread to the portion of the
internal thread upset thereby.
'I'h‘erhereinbefore described arrangements pro
vide simple, economical and practicable bolt and
nut constructionsV that- are quickly and easily
25
a» shoulder adapted when said nut istightened on
said bolt to bear axially against the front end of
the screw thread on said bolt to thereby upset said
front end of said external screw thread.
6. The combination of a bolt and a nut there
for, said bolt having an' external screw thread
locked by turning the bolt and nut relative to
eachother with suñîcient force to upset the thread 30
and said nut having an internal screw thread
of one member into the annular groove of the
adapted toVV cooperate with’ said external screw
' other member; and the> lock bolt or nut may be
thread, said nut having at the rear end of the'
unlocked only by a severe torsional force substan
tially equal tok thatrequired to' upset the screw
thread;
What I claim is:
35
,
`1. The combination of a member having a hole
with an'internal- screw thread and a member hav
ing an external screw thread cooperating with
said'ï internal screw thread, 'one of said members
having an` annular groo-vethereinY at the rear end
of the screw thread thereof, said groove being
arrangedïwith the wall' thereof remote> from said»
rear'end'of said screw thread in positionV to bear
axially against the front end of> the screw thread
of the> other of said members to thereby upset
said front end of said last mentioned screw thread
from helical to annular form when said'members
thread thereof a shoulder adapted when said’
nut is tightenedV on said bolt to 4bear axially'
against the front end of the screw thread on
said bolt to thereby upset said front end of said
external screw thread, the thread upsetting face
ofsaid shoulder being disposed at an angle that
is less than that of the wall of the thread en
gaged thereby.
‘7. The combination of a bolt and a> nut there
for, said bolt having an external screw thread>
thereonl and said nut having an internal screw
thread therein adapted to cooperate with said
external screw thread, said nut having an annu-v
lar groove therein at the rear end of the internal
screw thread therein, said groove being arranged
with the wall thereof remote from said rear end
are threaded together.
2.l The combination of a member‘having a hole 50 of'said internal screw thread in position to ax
ially upset the front end of said external screw
with an internal screw thread and a member' hav-_-4
thread when said nut and; bolt areV tightened.
ing an external screw thread cooperating with
8. The combination of a bolt and a nut there
said internal screw thread, the screw thread of
for, said bolt having an external screw thread
one of said membersterminating at its rear end;
in. an" annular' groove, said groove having the wall 55 thereon and~ said nut' having an internal screw>
thread therein adapted to cooperate with said
thereof remote from said rear end of said screw
external screw thread, said nut having an annu
thread inclined toward the bottom of the other
lar groove'therein at' the> rear end of the internal
wall of said groove and in position to bear axially
against,> the front endfof. the screw thread of said
other member to thereby upsetsaid front end of
said last mentionedl screw thread from helical to
annular form when said >members are‘th’readedf
together, the angle of inclination of the inclined
wall> of the'annular groove being less` than that
of: the'vvall- of thethread engaged thereby'.
> 3. The combination- ofi a boltand a nut there-f
for; saidï bolt having an external screw thread-`
thereon- and> said» nut having an internal screw
screw thread therein', said groove being arranged
with the wall thereof remote from said rearv end
of said> internal screw thread in position to ax
ially upset the front end of said external screw
thread when said nut and bolt are tightened,
said wall of said> annular groove being inclined
towards the other wall thereof atan angle that
less than that of the' wall of the external threadl
engaged thereby'.
9‘. A bolt having an' external thread thereon
and a reversely inclined externalV thread at the
thread therein adapted to cooperate with saidïex‘ 70 inneren‘d'o’fV said external thread, whereby said
reversely' inclined thread, when the' bolt is’ tight
ternal screw thread, said bolt having’ an annular
ened in- an internalV thread, will axially upset
groove therein at the inner end- of- the external
the bolt receivingien’d thereof,
screw threadl thereon, said groove beingarranged
g 10i vA nut having' arr internal thread therein
with the’ wall thereof vremote» from said'rea‘r end"v
and an@ annular groove at theinner‘ end> of> saidofïsaidfexternal screwïthread'inposition to axiallyV
2,405,402
threadrsaid groove having the wall thereof re
groove being arranged with the Wall thereof re
mete from said end of said thread inclined in
wardly towards the opposite wall of said groove,
whereby said inclined wall when the nut is tight
ened on an external thread will axially upset the Ul
mote from said inner end of said external thread
in position to axially upset the front end of said
internal screw thread when said bolt and nut
are tightened, said remote Wall of said groove
nut receiving end thereof.
having a V-shaped projection thereon adapted,
when the bolt is tightened, to concentrate the
upsetting eiîect at the contact point of said rib
11. A nut having an internal thread therein
and an annular groove at the inner end of said
with said internal thread.
thread, said groove having the wall thereof re
13. The combination of a bolt and a nut there
mote from said end of said thread inclined in 10
wardly towards the opposite wall of said groove,
for, said bolt having -an external screw thread
whereby said inclined wall when the nut is tight
and said nut having an internal screw thread
adapted to cooperate with said external screw
thread, said bolt having at the rear end of the
the nut receiving end thereof, said wall of said
groove being disposed at an angle that is less
thread thereof a second external screw thread
whose helix angle differs from the helix angle of
than the wall of the external thread engaged
thereby.
Y
said first mentioned thread of said bolt and is
adapted, when said bolt and nut are tightened
12. The combination of a bolt and a nut there
to axially upset the front end of the screw thread
for, said bolt having an external screw thread
and said nut having an internal screw thread 20 of said nut and thus prevent unscrewing of said
adapted to lcooperate `with said external screw
bolt and nut.
LIONEL A. CARTER.
thread, said bolt having an annular groove there
in at the inner end of the thread thereon, said
ened on an external thread will axially upset
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