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Патент USA US2404142

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July 16, 1946.
Filed sept'; 14. 1940
Patented July 16, 1946
PATE N T ' l
[C E '
2,404,142 ‘
Arthur L; Parker, Cleveland, Ohio, assignor of
one-half to Logansport Machine, Incorporated,
Logansport, Ind., and one-half ‘to The Parker
Appliance Company, Cleveland, Ohio,v a cor
poration of Ohio‘ _
Application September 14, 1940, SerialjNo. 356,845
_‘ 1 Claim.
(01. 285-586)
Figure 2 is an enlarged fragmentarysection'al
The invention relates to newand useful im
provements in tube couplings, and moreparticu
larly to a, tube coupling for‘clamping the ?ared
‘view ‘of the coupling of Figure l and illustrates“
vend of a tube,.and it primarily seeks to provide
‘Figure 3 is a view similar to Figure 2 illustrate
the fully clamped condition of thecoupling.
a noveltube'coupling‘ of the character stated in
which provision is made for effectively clamping
ing a: modi?ed form of the invention in'which'a'
sleevef'bend limiting clearance is formed in the
the tube against vibration ata. point spaced a
distance ‘above the ?ared endof the tube.
_ Y
Figures 4 and 5 are sectional views'similar, to
Figures 1, and Z‘and illustrating a modified form
of the invention in which’ the sleeve clamping
function is effected by line gcontact' engagement
‘ Couplings of the character stated include
threadably connected male and female elements
between which the ?ared endof the tube to‘ be
‘coupled is clamped, said male element including
of Figure
the nut6with
is a the
' V ;
a. conifcrm extension receivable within‘the tube
?are, and said female element‘bein‘g formed in
a modi?ed form of clamping sleeve.
U ‘ ‘
" ‘
two parts; one a clamping sleeve ‘having an abut 15
In‘the coupling herein disclo‘sed‘as an example
ment shoulder and a ?ared seat for engaging and
of ‘embodiment of the invention there is included
clamping the tube ?are against the coniform ex:
a male member and a female member threadably
tension, ‘and the other a nut threadable onto the
connected, the female member being, formed of
male element and including‘an' abutment shoul
two parts, a nut and a clamp sleeve, and the tube
der engageable with theclamping sleeve shoulder
for-‘forcing the sleeve into ?are clamping contact
with the tube.
In these couplings'the tubes are
Themale couplingmember 5 includes a coni
formgseat extension 16 which'presents a. tapered
securely clamped at the ?ared end alone andare
relatively free to vibrate‘ throughout their length
and right down to the clamped ‘ ?are.
clamping surface 1 for engaging in the ?ared
This is
25 end B of the tube 9 which is to beblampeain
objectionable and it is the purpose of'the present
invention to provide an improved‘ tube coupling
the coupling. "The male‘ member is externally
threaded as at’ l0 to receive the female-member,
in which provision is made for clamping each
tube against vibration not 'only‘at the vextreme
?ared endthereof but also vata point spaced well
above or in advance of said ?ared end. *
abutment shoulder l3 preferably formed" in‘an
elongated extension l4 ‘extending upwardly from
said nuttand having a tapered'bore IS. The‘ sec-‘
0nd part of the female member comprises a clamp
sleeve ', l6 whichls‘urroundsthe tube ‘9 within the
nut .I'L?and this sleeve includes a‘lower enlarge‘:
point spaced a'considerable vdistance above or in
parts; comprises a nut or clamp member? I l‘which
is internally threaded as'at l2 and includes"an
and clamping sleeve, together comprising the fe-'
‘ ,
' The female member, which is formed of‘ two
male element, include surfaces designed to- en-'
gage during the threading home of the nut'linci
dent to the effecting of a tube-‘coupling and cause
the clamping sleeve'to ?rmly grip the tube at a
' '
and it will be‘ observed by reference to Figure‘ l
of the drawing that the bore in the male member
and the bore in the tube to' be coupled ar'e'of sub
stantially the same diameter.
In its more detailed nature the invention-re
sides in the provision of an improved'form‘ of tube
coupling of the character stated in which the nut
advance‘of the ?ared end thereof."
to be coupled is ?rmly clamped between these '
male and female members.
ment vproviding an abutment-shoulder ‘l 1 adapted
Another‘object of theinvention is to provide
an improved tube coupling of the character stated
in which the surfaces of the nut‘and clamping
sleeve which engage in causing the'sleeve ‘to grip 45
to be engaged by the abutment shoulder: I3 ‘of the
nut and which has the’ lower end‘of its bore ?ared
as at-l8 for'engaging the ?ared end 8 of the tubev
9.-' The sleeve It also includes a clamping exten-v
or clamp the tube at a pointvspaced from the
?ared end of the'tube'is substantially a line con
sion= l9 which projects upwardly from‘the‘enl
largement at the position 'of the abutment-shoul
der [1, and this extension includes a cylindrical
portion 20 just above the abutment shoulder“
tendency of the sleeve to turn with the nut.
With the above and other objects in view that 50 and terminates in a tapered, thinned portion 2!; .
» It will ‘be obvious by reference to Figures‘l‘ and
will hereinafter‘appear, the nature of the inven
2 of the drawingthat when the nut l I is screwed ,
tion will be more clearly understood by following
tact only, thereby tc'minimize friction and the
homeupon the male member- 5 the abutment
the detailed description. the appended claim, and \
the several views illustrated in the accompanying
shoulder‘ l3 thereof ' will ultimately‘ engage »' the
abutment ‘shoulder ll of the’clampin'g ‘sleeve16 ‘
In the drawing:
Figure l is a central longitudinal section of a
tube coupling embodying the invention, the loose
assembly condition of the coupling being illus
and cause the ?ared end ‘8 of the tube 9 to be
?rmly'gripped or cl‘amped’between the clamping
surfaces 1'and‘l8 respectively presented'by' the
male extension ‘ 6 and the enlargement‘ of ‘the '
60 clamping sleeve "5. As the nut ll moves down
tube causes the tube to turn also. Another reason
'is that-if the tube is insome manner‘- prevented
from turning with the nut and' the clamping
over the external threads of the male member 5,
f the engaging tapered'surfaces formed at’ I5 011'
the nut andon the exterior of‘ the'rsleeve exten
sion 2| will cause the thinned sleeve extension.
to be displaced inwardly and into tight clamping~
engagement with the external surface of the. tube
9 in the manner clearly illustrated in Figure 2
of the drawing. By this means the tube. is se
curely clamped at the ?ared end thereof between
the clamping surfaces 1 andfltl and is also se-‘
*curely clamped as at 22 by the inwardly displaced
sleeve, the clamping sleeve will wipe over the
?ared end of the tube in abrasive contact. An
other reason is that there would be a greater
turning torque required to thread the nut upon
ther?tting in couplings not provided with the line
contacting bead‘ 26. Provision of the thinned
1,0 potrion 26 may also be utilized to render the
nut‘ extension yieldable so that it would be ca
. 5.
sleeve extension 2| at a point spaced a consider
able distance above the ?ared end of the tube.
By'reason of the provision of the cylindrical '
a portion 2070f the sleeveextension I9, the inward
bending, effect upon thesleeve extension is con
?ned to'the upper portion thereof and does. not
reachrthe vicinity of the abutment shoulder ll.
It will'bereadily recognized'that it would take
considerably more force'to collapse the enlarged‘
head vof the sleeve inwardly; and it is for this
reason that the cylindrical portion 20 is provided
as a relief. By collapsing or inwardly depressing
the thinned wall at the upperportion of the sleeve
pable'of slight expansion in the region of the
line contact with‘the-tapered clamping sleeve so
that in case the sleeve has been forced into'tight
contact with the tube and the abutment shoulder
of the nut and the clamping sleevev are not yet
in contact, the thinned portion 25 of the nut, ex?
tension could expand slightly as it advancedon
the tapered surface of the clamping sleeve until
the. abutment shoulders properly engage. This
feature, compensates for machining tolerances
and,v also slight ?uctuations in the diameters. of
tubes to be coupled.
If desired, the clamping sleeve can be longi
extension IS, the sleeve is. made to ?rmly grip ~
tudinally slitted as at.28 So as to facilitate bend
the tube 9 at a point spaced well above the ?ared
end thereof, andvthis sleeve extension clamping
e?ect serves to checkyibrations' before they reach
ing of the upper extremity thereof into clamping
contact with the tube to be clamped. This modi
?cation of the clamping sleeve is illustratedin
Figure 6 of the drawing.
7 the ?ared end of theytube.
InfFigure 3. of the drawing there is illustrated
It is to be understood that the dimensions» and
a .slightlmodi?cation of the coupling in which the
structural detail’of the various coupling, parts
clearance’ intended to limit the bending area of
can bealtered to suit thedemands of ‘different
thesleevev extension is formed as at 23 in the nut
installations Without- departing from- the scope
of the invention as de?ned in the appended
instead of in the form of a cylindrical wall on
the clamping sleeve. In all other respects the “
coupling of Figure 3 is constructed and functions
Having thus described the invention, what I
in the same manner as the coupling disclosed in
claim as new and desire to secure by Letter
Figures 1 and 2, and additional description of
Patent is—
In a coupling for tubes, coupling members'hav-i
40 ing threaded engagement, one of the coupling
members having» a seat adapted to engage the
From the'foregoing it will be apparent that the
inner face of the ?ared end of a tube, the other
thinned and tapered extension of the clamping
coupling member having a clamping shoulder on
sleeve can be formed with or withoutthe cylin
' this modi?ed form of coupling is thought to be
drical, bending area determining portion.
Inr<Figuresr4 and 5 of the drawing another
its inner face disposed in a'plane at right angles
to the longitudinal axis of the coupling'members,
modi?ed form of the invention is shown’; 'In this
form‘v of" the invention an annular clearance is
provided in the upward extension of the nut; and
this, clearance is effected to provide‘a thinned
a clamping sleeve surrounding the tube within
said last-named coupling member and‘ having: at
mate clamping contact‘ with the tube in the man-‘
ner indicated at 2T in Figure5 of the drawing,
thus clamping the tube at a, point well above the
coupling member betweenthe clamping shoulder
thereon and the outer end thereof being shaped
its inner end'a solid head provided with a‘ 00min
vform‘ face engageable with the outer face of ‘the
portion 25 terminating in anginwardlyv directed 50 ?ared end of the tube, said solid‘ head at the
outer‘ portion thereof, being disposed in a plane
extension or bead 26' disposed to engage the up;
at right angles to the axis of the coupling-mem
per' tapered and thinned end of the clamping’
bers and forming a‘ clamping shoulder adapted
sleeve in line contact as the female member is
to cooperate with the clamping shoulder onisaid.‘
threaded'home on the externally threaded male
last-named coupling member, said sleeve being
member. As the female member is threaded onto
extended from said head outwardly and“ having
7 the malefmember, the bead or extension 26"forces
its external surface tapered, said last-named
the upper'end of the clamping sleeve into inti-,
clamped flared'end'thereoi‘ in a mannerand for
the'same purposes hereinbefore described.
The advantages of providing line contact be;
tween the nut andithe clamping sleeve through
the inwardly directed rib 26 will be obvious for
bythisrmeans turning friction of the nut upon
the sleeve is lessened. Unless this provision of
line contact between the nut and the clamping
so as to engage said tapered surface for contract
ing the outer end portion of the sleeve into en-' "
gagement'with the tube for damping vibrations
imparted thereto, said clamping’ shoulders being
initially spaced from each other to permitv rela
tive movement of said coupling member and the
sleeve for contracting said sleeve‘ and‘ operating
when brought into contact to limit further con
traction of the sleeve, said shoulders when in
' sleeve'is made, there is a considerable amount of
contact also operating as a means for positively
friction ‘generated between the nut and the sleeve
as the nut is threaded home-on the male mem-‘
her and the sleeve, is likely to turn with the nut
upon the tube. This is objectionable for several
forcing the sleeve into clamping engagement with
the tube for ?rmly clamping said‘ tube against
7 reasons.
One is that the sleeve as it grips the
the seat on said‘?rst-named coupling member.
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