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Патент USA US2406686

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Aug. 27, >1946.A
- J. w._ Hoses
2,406,686
METHOD 0F MAKING SEALING DEVICES
Original Filed Sept. 5, 1942.
z Smets-sheet 1
Aug. 21, 1946.
J. W. HOBBS
2,406,686
. METHOD oF MAKING SEALING DEVICES
original Filed sept. 5, 1942
v2 sheets-sheet 2
2,405,686
Patented Aug. 27,= 1946
vUNITED STATES PATENT OFFICE
`METHOD oF MAKING SEALING DEvIoEse.
John W. Hobbs, Springiield, Ill., assignor to John
I W. Hobbs Corporation, Springfield, Ill., a cor
poration oflllinois
Original application September 5, 1942, Serial No.
457,397, now Patent No. 2,372,781, dated April
3, 1945. Divided and this application June 24,
1943, Serial No. 492.041
1 Claim.
.
(o1. ,2Q-14s) I
l
disposition about a shaft to prevent the escape '
shaft;
shaft, although the device may have other uses
and purposes as will be apparent to one skilled
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Y
’
This application is a division of my copending
A
,a
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`
of making the sealing device.
application entitled “Sealing device,” filed Sep
tember 5, 1942,. Serial No. 457,397,k now Patent
No. 2,372,781.
and
"
Figure 5 is an enlarged transverse sectional
view through the sealing device taken substan
tially as indicated by the line V_V of Figure 4,
looking in the direction of the arrows, and indi
cating in dotted lines a step in myV novel method
of lubricant from bearings associated with` the
in the art.
2
Figure 4 is an edge elevational view of the
sealing device seen in Figures 2 and 3, With the
covering boot shown in section, the device being
seen in its expanded condition, removed from a
This invention relates to improvements in a
method of-making a sealing device, and more
particularly'to a method of making a sealing
device that is in the nature of a packing ring for
‘
'
As shown on the drawings:
For purposes of clarity, I will first proceed with
a description of the- use and construction of the
_'
It is an‘important object of this invention to
provide a method of makingV a sealing device
sealing device itself.
'
The illustrated embodiment of the instant in
vention is shown in association with an idler
wheel mounting for a Caterpillar tread, such as
of such a Vsealing device which need not be taken
may be incorporated in a tractor, tank, or the
apart in order to equip it with a new sealing
20 like, in Figure 1 of the drawings. This idler
Vmeans in lieu of a worn sealing means. '
wheel mounting or assembly includes a station
Anothery object of the invention resides in the
ary shaft I carried in a' pair of end supporting
provision of a method of making a sealing device
bearings 2 and 3, the shaftbeing provided with
of a character such as to be axially compressible,
equipped with replaceable sealing means,> the
practice of the method resulting in the provision
integral flanged portions land 5 spaced apart
and disposed at an intermediate region of the
the method resulting in such a device which is
substantially permanently ,assembled in position
shaft. Against each of the flanged portions 4
for use regardless of its axial compressibility.
A further object of the invention is the provi
sion of an extremely simple and economical
method of making a sealing device havinginter
locking parts eliminating any unintentional sep 30
aration of the parts of the device.
,
"
A further object of the invention is the provi
Ision of a facile and economical method of making
a sealing device to retain lubricant or some other
liquid or semi-liquid substance` in its desired lo-A
and 5 is a roller bearing assembly 6 which carries
an idler Wheel or pulley 'I equipped with suitable
Caterpillar tread engaging lugs 8. The> idler
wheel is preferably put on in two sections which
are joined together after mounting by a suitable
seal 9. A suitable bearing holding collar I Il is
provided on the outside of each bearing 6, and
has an upstanding ñange engaged by lone or more
holding lugs I I struck inwardly from the pulley 1. _
Sin’ce the pulley 'I rotates under heavy load on
the bearings 6_6, suitable lubricant must at all
times be supplied to the bearings. To this end,
the shaft is provided with an interior step-down
tion have been above pointed out, others will ~be-.
come apparent from the following disclosures, 40 bore I2 closed at the outer end by a suitable plug
I3. Lubricant may be provided under pressure to
taken in conjunction with> the Aaccompanying
the bore I2, and passed to each of the bearings
drawings, inwhich;
I
. j
through radial channels I4 and I5 in the shaft.
I Figurel is a fragmentary partrsectionaL‘part>
Each of the channels I4 and I5 communicates
elevational View of a Wheel mounting for a Cat-?
with the arcuate wall I6 of the adjacent collar
erpillar tread, the mounting including sealing
cation against leakage.
n
l
1
While some of the more salient features, charf
acteristics and advantages of the instant inven
IIJ so that the lubricant under pressure may pass
devices embodyingprinciples of the instant in-`
vention;
`
K
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y
,
along this curved wall I6 and enter the roller
bearing assemblies 6_6. It is naturally desir
able to prevent loss of lubricant between the shaft
I and the supporting bearings Zand 3. To this
v
Figure 2 is an enlarged side elevational view.
of one of the sealingdevices embodied in the
structure
of Figure
1;
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'
“
‘ 2
,
_
' Figure 3 is an enlarged fragmentaryvertical,
end, a ysealing device'embodying improvements
sectional View of the sealing deviceof Figure 21
in position on a shaft, theshaft being shown in
of the instant invention is mounted in the struc
ture outside of each ofthe bearing assemblies
elevation, and parts of the sealing device _being
shown in elevation;
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6_6.
55
.
f
. Such sealing device Vis generally indicated by
2,406,686
3
reference numeral I'I, and the sealing device has
a plurality of studs extending therefrom on each
side. In the illustrated instance, there are three
such studs I 8 on one side, and a similar num
ber of studs I9 Von the opposite side. The studs
I9 fit in suitable sockets in a washer 2|] abutting
an inwardly extending flange on the adjacent eol
lar member Ill, and the studs I8 seat in suit
able recesses in the adjacent supporting bear
ings 2 or 3 as the case may be. When so mount
4
tures to provide a narrower neck portion lead
ing axially into the aperture.
With reference to Figure 4, it will be seen that
the lugs 2B on the right half-portion 24, and the
lugs 32 on the left half-portion 23 overlap each
other and are normally in edge to edge contact
when the sealing device is not mounted in oper
ative position.
The solid body portions 3u of
the left member extend into the openings 21 in
the right member, and likewise the solid body por
tions 26 of the right member extend into the open
ings .3l of the left member. The lugs 28 and
32, `while permitting axial movement of the side
members toward each other to the depth of the
openings .21 and 3|, do not permit an axial sepa
.ra'tion of the members beyond the position seen
in Figure 4, due to the edgewise abutment of the
lugs with each other.
ed in position, the sealing device is ,preferably
under axial compression, .that is, the device is
actually squeezed axially between the washer 20
and the adjacent supporting bearings .2 or V3.
Such squeezing action, as v,will more fully later
appear herein, augments the sealing function of
the device, andl the device is internally con
structed to provide a reactive outward pressure
against the axial compression.
Each of the studs I8 on the radial flange 25 is
With reference now to Figures 2, 3 and 4, it will 20 provided with a reduced shank 33A extending
'be seen `that the sealing ydevice is >in the nature
through .to -the inside of the flange. fLikewise,
.of ‘a retainer ring, landis enclosed within 1a boot
'or `casing `2I, preferably lof resilient material,
each ofthe studs I9 on the radial "flange y29 `on
vthe left member-is provided with a reduced 'shank
which functions as 'the sealing medium proper.
'3'4 extending inwardly from that flange. With
ThisI boot may be made of any suitable material, 25 >reference again to >Figures 3 and .4, it will'be seen
such, `for example, las synthetic rubber, ia mate
that 'the studs >It and I9 are directly opposite each
«rial known las “neoprene” being a lsatisfactory
other so that Voppositely disposed Shanks 33 and
substance.
As seenbest in Figures 3 `andëìl, >the `boot fis lof
3d provide a suitable .mounting means for a com
Ypression spring 35. In the illustrated instance,
channel shape and the .sides fo'f the channel `are 30 there are three such compression springs dis
provided with suitable faperture‘s through kwhich
posed equidistantly around ’the sealing device.
The springs 35 always tendY to force the `two
Figure Á3, when the sealing device is vmounted in
half-portions of the device outwardly and thus
position “on the-shaft 'I, the resilient boot 2l has
separate them to the limit established bythe
what may be termed edgewise 'engagement 4with 35 edge to 'edge ‘engagement of the lugs 28 and 32
the shaft 'as indicated --at v22 -on each side of the
indicated `at; 36 .in Figure 4. It should be men
sealing device. rSuch ‘edgewise engagement, vespe
tioned that in Figure 4 one ofthe springs 35 has
cially when'the sealing -device 'is under an axial
been omitted from 'the disclosure for the purpose
compression, provides an -exce'edingly‘positive seal
of clarity.
against vthe leakage “of lubricant along the outer 40
As stated above, this invention also contem
surface ofthe shaft. >It will V'also 'be kespecially
plates a novel method of making the sealing de
noted Ythat such 'edgewise engagement provides
vice. "To this end, `each half portion -23 and 25';
only a 'minimum lsur-face :Contact of lthe sealing
of the device `may Vbe formed in a punch press
the studs I8 and i9 extend.
As seen -best in
medium ‘with the lshaft ‘so'that there will be ex
tremely little wear iupon 'the 'sealing Amedium in
the event the lshaft il. rotates relatively to the
sealing device.
Interiorly thereof, .the sealing device comprises
a‘pa'ir ‘of complemental 'half-portions, that is, a
left half-portion and-a right 'half-‘portion of simi
lar construction. 'These `portions >are generally
.indicated by numeral '23 forïthe'lefthalf-portion
. and 24 io'rïthe rightlhaIf-porïtion.
The right ‘half-portion "24 includes -a -radial
flange ‘2.5 extending outwardly ‘from ‘an integral
body portion `2li ‘which vis 'of substantially cyl-in
drical »construction for telescopic engagement
with fthe shaft l. YThe body portion 26 is 'pro
vided 4with a plurality of vrelatively large aper
or other suitable mechanism.
However, on one
of these half-portions, and `it maybe either one,
the circumferentially extending lugs forming the
interlocking engagement rare left 'in outwardly
bent position. vIn the illustrated instance, I have
selected the "half '23 »for this purpose, yand with
50 reference to ‘Figure `5 it will be seen that initially
the lugs 3‘2 are "left >in outwardly 'inclined _posi
tion as indicated by the dotted lines in'this figure.
This 'half-portion 2-3 with the outwardly inclined
lugs >32'i's iirst put on a form sha-ft or'arbor. The
springs 35 'are then held in position as the other
half-portion 24 is pushed on the same arbor and
the respective >solid 'body portions yof both lhalves
enter 'into the corresponding openings 21 and 3|
in the opposite half-portion. The lugs 32 are
tures î21 spaced therearound. In fthe illustrated 60 preiera'blyoutwardly Vinclined just suñiciently for
instance there ‘will be A'three’suéh apertures 1in the
the ‘lugs'28 on >the'half-portion 24 to pass Vby them.
body portion. 'One -side wall 'of each aperture is
These lugs 23 are in true circumferential rela
free foflobstruction and parallels the axis of the
tionship'with the remainder of the body‘p‘ortion
device. VA `lug 28 extends circumferenti‘ally on
the ’other side -wall ofthe aperture, 'as seen best 65
'When thepartsfare-sotmountedïwith the springs
in ‘Figure 4,'ïthus 'de'ñn'ing 'an open‘neck portion
35 fin place, the parts are -pressed `axially‘tow‘ard
leading finto the opening -or aperture 'Z1 which
each other sufficiently for the lugs 8 to pass Vthe
neck fisfd'eñniïtely lnarrower 'than the 'main part
outwardly I'inclined lugs '32. When so positioned,
of the opening.
`
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the lugs 32 'are then bent inwardly to the cir
The »left-portion or member 23 is of 'comple 70 cumferential extending position in interlocking
mental "and similar construction, "including a
engagement with ’the lugs 28 on the opposite
radialV flange 29, a cylindricalbody portion A3i), a
half-portion. The form shaft or arborvforms a
seriesof relatively'large aperturesßl in the‘body
backing vfor this bending operation which maybe
portion„and a lug 32 extending circumferenti'ally
done very simply'and expeditiously,` 'and vthe de
from'one of "the side `walls `of `‘each ‘of the ‘aper 75 vice is then securely held together.>` After this
26.
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2,406,686
5
forming operation, the resilient boot 2l is placed
in position, over the structure, and locked in place
to limit the vpatent granted hereon otherwise
than necessitated by the scope of the appended
over` the protruding studs I8 and I9.
claim.
'
From the foregoing, it is apparent that I have
provided a novel and easily practiced method of
making a sealing device. It will be noted that
the method isquite economical to practice, and
.
I claim as my invention:
The method of making a sealing device, in
cluding the steps of forming one of a pair of
complemental substantial vcylindricalv members
with circumferentially extending spaced lugs
results in the provision of asealing device in
thereon, forming the second of said pair of mem
stantly -ready for use. Further, it Will be noted
that a sealing device manufactured in accordance io bers With the corresponding lugs projecting at
an angle to the circumference, assembling said
with the instant method is capable of having the
members in confronting relationship on an arbor
sealing medium per se replaced when desired
with spring means therebetween, compressing
Without the necessity of removing or separating
said springl means by relative axial movement
the parts of the device, and the device effectively
maintains its assembled condition against unin 15 between said ymembers until the circumferential
lugs are behind the angular lugs, and bending
tentional separation even though it is readily
the angular lugs against the arbor as an anvil
axially compressible when in use.
into interlocking relationship with said circum
It will, of course, be understood that various
ferential lugs to hold said members united against
steps of the method may be varied through a Wide
range without departing from the principles of 20 the action of said spring means.
JOHN W. HOBBS.
this> invention, and it is, therefore, not the purpose
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