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„Fume L E94.
Filed Aug. 2o, 1947
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Patented June 1, 1948
George E. Dunn, Dearborn, Mich., assignor to
Universal Products Company, Incorporated,
Detroit, Mich., a corporation of Delaware
Application August 20, 1947, Serial No. 769,579
1 Claim. (Cl. 2li-148)
This invention relates to an improved method
of installing boots on universal joints.
More particularly, this invention relates to a
method of installing a resilient boot of the char
acter `disclose-d in Patent No. 2,308,073, issued to
Joseph W. Hagerty on January 12, 1943, on a uni
parts thereof in the first step of installing a new
boot on the joint in accordance with this inven
Fig. 3 is a view similar to Fig. 2 illustrating the
position of the parts in second step of the instal
lation of the boot; and
Fig. 4 is a View similar to Fig, 2 illustrating the
versal joint of the character disclosed in Patent
boot in its completely assembled position.
No~ 1,987,678, issued to Paul B. Goodard and
Referring now to the drawing, it will be seen
Frank Ketcham on January l5, 1935, in which the
joint is of the type including a housing provided 10 that a tubular propeller shaft 5 is shown as pro
vided at one end with a universal joint which com
at opposite sides with cylindrical guides and a
prises generally a shaft 'l having a head 9 dis
central guide of a cylindrical character. This
posed within the central cylindrical guide of a
housing is adapted to be connected to a iianged
shaft or the like at one end. A second shaft mem
housing l0. The head 9 is provided with a bore
ber projects into the housing and into the cy 15 disposed perpendicularly to the axis of the shaft
'l for receiving a transversely disposed pin ||.
lindrical central guide thereof. The shaft is pro
The opposite ends of the pin | I project equal
vided with a pin extending perpendicularly there
distances on opposite sides of the head 9, thus
through, on the opposite ends of which are jour
providing trunnions upon which are journaled
naled truncated balls. The ends of the pin are
each provided with an axial bore for receiving 20 truncated balls I3 by means of needle bearings
l5. The opposite ends of the pin are each pro
the shank of a button which bears radially against
vided with an axial bore for receiving the Shanks
the housing for centering the joint.
of end thrust members or buttons Il which are
A resilient boot of the type shown in Hagerty
disposed in cylindrical guides on opposite sides of
Patent No. 2,308,073 encloses the shaft outwardly
0f the housing so as to seal lubricant therein. It 25 the housing, and which bear radially against the
housing I0' for centering the joint.
has heretofore been the practice, if for any rea
The shaft 'l extends into one end of the housing
son it was necessary to replace the boot after the
l0, and the opposite end of the latter terminates
joint has been installed in a vehicle or the like,
in a radially extending annular flange 2| which is
to use as a replacement for the resilient boot, a
split leather boot which is laced in place, or a like 30 adapted to be secured to a complemental ñange of
a shaft (not shown). A cover plate 23, which is
integral resilient boot which is installed by driv
provided with a plurality of radially extending
ing the pin from the shaft and removing the hous«
tabs 25, is secured to the ñanged end of the hous
ing to permit the installation of the new boot.
ing l0 by bending the tabs over the flange 2|.
As the pin must be accurately centered, withre
spect to the shaft and housing in order for the 35 The cover plate 23 is provided with a concentri
cally disposed annular groove or seat 21 which
joint to operate properly, diñiculty has been en
4receives and holds in position the large end of a
countered When garage mechanics disassemble the
helical spiral spring 29, the other end of which
pin from the shaft and then reinsert the same.
surroundingly engages a boss 30 concentrically
Most mechanics have no accurate way of properly
centering the pin within the shaft so that there 40 formed on the axially terminating head 9. A suit
able gasket 3| is interposed between the cover
is a probability of it being improperly reassem
plate 23 and the housing flange 2| for sealing
bled, whereby the joint will not function properly.
It is therefore the principal object of'this in
lubricant within the housing and excluding dirt
and dust therefrom. The opposite end of the
vention to provide a method whereby an integral
resilient boot may be installed on a universal joint 45 housing I0 is formed with an annular inwardly
disposed flange or rim 33, the inner surface of
in a simple, effective, and relatively speedy man
which is ñared outwardly at 35 to provide gen
ner without disassembling the pin from the shaft.
erally a conical shaped opening for the end of the
Other objects of this invention will become ap
housing, with the opening ñared outwardly into
parent from the following detailed description
taken in conjunction with the accompanying 50 larger diameter. A bead 31 is formed on the
outer end of the rim and provides an abutment
drawing in which:
for assisting in the retention of a part of a boot,
Figure 1 is a longitudinal sectional view of an
assembled universal joint; _
Fig. 2 is a reduced side elevational view of the
generally indicated at 39.
The boot 39 is provided for preventing the
universal joint illustrating the position of the 55 escape of lubricant and also preventing the in
gress of dirt, water, or other foreign mattei', and
is made of a material comprising rubber or rub
on the outer end of the boot abutting the pin II
and the rim 45 on the inner end of the boot within
the housing I 0.
With the housing in position so the pin II can
ber-like material which is flexible. Elastic and
flexible natural rubber or synthetic rubber may
be employed andiin the case of synthetic rubber,
enter the cylindrical guides, the housing is
The boot
grasped and pulled to the right, as viewed in Fig.
39 comprises an outer bellows portion 4I -ha-ving
a pluralityof spaced corrugations 43. As seen
end of the greased boot Willbe forced through the
in Fig. 1, the left end of the boot terminates in a
housing and through the opening defined by the
Neoprene or Perbunan may be used.
3, over the pin II. When this occurs, the inner
noncorrugated normally tapered portion 45 10 housing rim 33. That is, the boot rim 45 will be
. forced through the housing opening so that it
adapted to encircle a cylindrical portion 41 of the
can then be grasped by the fingers and thumbs
shaft 1. A clamp 49 is provided to retainfthe endl
and the boot pulled completely through the housof the boot on the cylindrical shaft portion 41.
ing opening (Fig. 3) so that the rim 45 can be
The opposite end of the boot has a rimor ñange
5I adapted to extend over the rim 33 of the hous 15 connected to the cylindrical shaft portion 41. The
frusto-conical portion 55 on the opposite end of
ing ID, and when so positioned is secured to the
the boot can then be properly positioned so as to
rim 33 by a clamp 53. A frusto-conical boot por
extend along the tapered portion 35 of the rim 33.
tion 55 extends from a point adjacent the inner
and the boot rim 5I can be positioned over the
end of the boot rim 5I and this portion is adapted
to extend along the surface 35 of the housing rim 20 housing rim 33, as seen in Fig. 1. The replace
33 so as to prevent leakage Vof lubricant from the
ment boot has thus been installed without re
moval of the pin II. The truncated balls I3, the
It will be appreciated that when the joint is ini
bearings I5, and buttons I1 will then be replaced,
and the joint filled with lubricant beforeV the
tially assembled, the boot 33 is secured either to
the cylindrical portion 41 of the shaft 1 or to the 25 cover plate 23 and spring 29 are reassembled. The
rim 33 of the housing I0, and then inserted over
lubricant will then be completely sealed in the
and clamped to the other member. However,
after thejoint has been assembled in, for exam
It will thus be seen that a method of installing
a universal-joint boot is provided which makes
ple, an automobile, the practice heretofore, if a
rubber boot is to be installed, has been to cut 30 the installation of the boots relatively simple and
away the old boot and push the housing I3, as
which preventsany damage to the universal joint
viewed in Fig. l, to the left, and then disassemble
or any change in the trunnions.
the button I1, truncated balls Yand bearings I3 and
I5, and drive the pin II out of the head portion
I claim:
The method of installing an annular,- one-piece
El so that the housing can be withdrawn to the 35 rubber boot- on a universal joint of the type `in
right. A new rubber boot 39 was then installed
cluding a housing having opposed cylindrical
on either the shaft 1 or housing rim 33 and the
guideways and a shaft projecting axially into
housing and its partsv reassembled. This has
one end of'said housing with trunnions projecting
proved unsatisfactory as> this work isgenerally
radially from opposite sides ofthe shaft for sup
done by an ordinary garage mechanic who does -40 porting truncated balls on the opposite ends
not possess the proper instruments to properly
thereof which roll in said opposed, guideways,
center the pin I I within the shaft, so that the pin
comprising the steps of moving the housing ax
I I maybe improperly centered and the joint will
ially along said shaft so that said trunnions are
not operate properly.
disposed outwardly of the other end of said hous»
It is therefore desirable to provide a method
ing, of removing said truncated balls, of greas
of installing the boot 39 on the jointwithout ne
ing the trunnions, the shaft, and the boot to be
cessitating removal or movement of the pin II.
installed both inside and out, of positioning said
The applicant has devised a method of so in
boot angularly with respect to said shaft so that
stalling the boot.
The installation is accom
plished by ñrst removing the cover plate 23 and ,
the spring 29,` after the old boot has beencut
away, and then sliding the housing I0 to the left
as viewedin Fig. 1 so that the buttons I1 and the
balls I3 and the bearings I5,can be removed from
the pin II. Therinside of the housing` I0, the ;
shaft head portion 9, and both the inside and out
side of the new or replacement boot 39` are then
thoroughly greased with preferably alight grease.
The rim 45 on one end of theV boot is then
stretched over the pin I I as can be seen in Fig. 2. 60
one of said trunnions is received in one endzof
said boot, of stretching said one end of the boot
over the other trunnion, of working the boot in
wardly until it is disposed between the~housing
andthe trunnions, of pulling the housing axially
toward said trunnions so as to force the inner
or advancing end of said boot out of said one
end‘of the housing and aroundY the shaft, and-of
pulling the entire> bootcut of the housing and
securing said advancing end‘ to the shaft and
the opposite end to said housing.
This is best accomplished by tilting the boot at
an angle, so that one end of the pin -I I is disposed
within-the end of the boot, and then stretching
the rest of the boot end over the opposite end of
the pin. The remainder of the boot is then
worked inwardly over the pin by a pushing and
rotating movement with the ñngers and thumbs,
until it is in the position illustrated in Fig. 3,
wherein the boot is compressed between the pin
I Land the housing I I) with the conical portion 55 70
The following references are of record in the
file of this patent:`
Name _
Goodard _________ __ 32.11.15, 1935
'Hagerty __...'..`____ __ Jan. ‘12, 1.943
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