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Патент USA US2412859

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Dec. 17, V1946.
2,412,859
GJA. BARNES
SEAT DRESSING TOOL
-Filed Oct.. 15., 19,45
¿2g/2839.40"
_
_
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'2,412,859
Patented Dec. l?,` 1946
UNITED STATES . PiISfIÍlEZNTk OFFICE
2,412,859V
SEAT `DRESSING 'I‘QOL
Galen A. Barnes, Indianapolis, Ind.
Application October 15, 1945, Serial No. 622,295
9 Claims. (Cl. 51--l31)
1
Z.
housing I3 has a shaft-bore I 5 and a larger
bore I4‘ for the reception of a bearing I5. The
rotor shaft `i'I is mounted in the bearing I5 and
carries at its inner end a pump rotor I8. In
common practice, the outer end of the shaft
I1 carries a sheeve 20 for a driving belt, and
This invention relates to a tool for dressing
the seat of a shaft-seal, for example of the seal
around the driving shaft of an automobile water
pump.
In water pumps commonly used on automobiles,
and in many analogous situations, a shaft open-`
may also Vcarry a fan. To seal the pump around
ing is sealed by a sealing disk rotatable with the
the shaft Il, a sealing disk 2l carried by the
shaft and yieldingly urged axially against an
rotor I8 and sealed with respect thereto by a
annular seat on the housing. The seat must be
29, is pressed by a spring 28 against
fiat, true, and perpendicular to the shaft axis, 10 bellows
a seat 2B on the shaft housing. Conveniently,
and must have a smooth surface. In a water
the spring 23 lies around the bellows 2S), in a
' pump, the seat is surrounded by other parts of
the' housing, and its inaccessible location makes Acup 25 in the rotor. Lugs 3D on the sealing disk
it extremely difñcult to dress, save with expen
sive factory tools not practically availableV for
repair work. In consequence, when such a seat
2l engage notches 3i in >the rotor it, to cause
the disk 21 to turn with Vthe rotor ißt.
The seal seat 2B is formedas „an annular ñat
15
on a bess 32 projecting inwardly around the
shaft l?,
a plane normal to the. axis _of the
is damaged, even though but slightly, it is prac
tically necessary to discard the whole housing.
shaft `Z'I, and generally concentric with that axis.L
It is the object of this invention to provide
a simple inexpensive tool lwhich will be practical 20 It thus lies ncrrnal to, and concentric with, the
for repairing such seal-seats.
shaftrbore tliiiand the bearing-bore I4.
`
For dressing the seat 26, the tool shown in
In carrying out my invention, I provide a
cylindrical head to be mounted for relatively high
Figs. 2 and`3‘ comprises _a head '3.5 adapted to
be mounted on a driving shaft 36, conveniently
speed rotation on any available standard shaft,
a standard one-half inch shaft of an electric
conveniently a standard half-inch 4electric-‘motor 25 motor
or of an arbor. The rotor 35 is formed to
shaft. At its forward end the head carries 4an
provide a shoulder _JI to receive an annular
interchangeable tool which >provides a dressing
facing tool 38. This is desirably formed of metal
face perpendicular to its axis of rotation. An
eccentric which rotatably Vfits a .bore in the pump
case and which `is rotatable with respect to the
head, is positioned by a pilot shaft with its
axis of eccentricity coaxialwith the head axis.
The eccentric will supporta housing with its
seal-seat in proper position for dressing against
the dressing face .of the tool; axial plîe‘SSllre can
be applied manually; and manual rotation .of
the eccentric will carry the seal seat in‘an ec
centric path over the face of the rotating tool,
to give adequate relative movement to ensure
effective dressing of the seat to the desired ñat,
true, and smooth condition.
The accompanying drawing illustrates my in
vention. In such drawing, Fig. 1 is an axial
section through a typical shaft seal, shown in
association with a water pump; Fig. 2 is an axial
section showing a preferred form of my tool in
position to dress the seat of the seal shown in
Fig. 1; Fig. 3 is an end elevation of the tool shown
in Fig. 2; and Fig. 4 is an axial section showing
a modified embodimentfof my invention.
My tool is adapted to dress the seat of a shaft
seal such as that of the water pump typified in
Fig, 1. That water pump comprises .a case I0
formed to provide a rotor housing II, an inlet
passage I2 and a shaft-bearing housing I3. The
30
and faced with a renewable abrasive disk 39.
The facing tool §13` is conveniently replaceable,
as by being held in place by a snap ring 45 and
provided with a hole 4I to engage a driving pin
4_2 on the rotor 35. A pilot .45 projects forwardly
from the rotor 3,5 coaxial therewith, and is re
ceived in an eccentric sleeve 5€) which rotatably
ts a bore in the fhousing I9, Vco_riveniently the
bore I4 in that boss I3. ',I‘he sleeve 5I] is _proÍ
vided with a manually Operable handle 5I.
In use, the head 35 is mounted on a shaft
3B to rotate about a fixed axis. A facing tool
38 is placed on the head 35 against the shoulder
31, and a pump case IE! is then placed in the
position shown in Fig. 2, with its seal-scat 26
against the abrasive face 39. The eccentric 5i]
' is then inserted in the bore Ill around the pilot
45, which ñxes the common axis of the head
35 and pilot 55 parallel to the bore I4 of the
pump case III, and hence perpendicular to the
seat 2S. With the casing Ill manually held
against rotation and pressed axially, the head
35 is rotated at high speed, and the handle 5I
is operated to rotate the eccentric 50 to carry the
casing in an eccentric orbital path about the
axis of eccentricity of the eccentric 55. The
working face 39 is thus rotated at dressing speed
2,412,859
3
.
against the seal-seat 26, while the seat 216 is
translated through a circular path about the axis
of rotation of the working face 39. This causes,
between the seat 26 and the working face 39, a
simultaneous rotation and relative movement in
an eccentric path, to dress and true the seat 26.
When it is desired to change the working sur
face 39 during the course of the operation, the
tool 38 may be removed by sliding it oli the end
of the pilot 4-5 and replacing it with one which
has a face 39 of the desired characteristics.
In the modification of Fig. 4, the pilot d5 is
carried by the eccentric 59 instead of by the
head 35, and the head 35 is bored to receive the
no-w inwardly projecting end of the pilot 45; In
this case, the tool 38 is provided with a rim 53
to engage a snap ring 5t carried circumferen
tially on the rotor 35.
Preferably, the tool is provided with a plural
ity of eccentrícs 50 having outer surfaces of dif
ferent diameters, to adapt the tool to use on dif
ferent casings. For a large majority of automo
bile water pump seals, because of standardization,
one size of eccentric 5G will be suiiìcient, and ec
centrics 5l) of two sizes will adapt the tool to
substantiallir all of the water pumps now in use.
The tool of this invention is simple and inex
pensive, so that it may readily have wide avail
ability in repair shops. It will effectively dress
4.
housing perpendicular -to and generally concen
tric with a bore in said housing, comprising a head
rotatable at dressing speed, an annular tool there
on providing a Work-surface perpendicular to the
axis of head rotation, a pilot coaxial therewith, an
eccentric having a cylindrical outer surface
adapted to rotatably ñt said bore, and a handle
for rotating said eccentric to cause relative revo
lution between the bore axis and the common axis
of the pilot, head, and tool.
‘ ‘
" " ‘
`5.11151 seat-dressing tool as deñned in claim 4in
which the pilot is integral with the head and is
. rotatably received in said eccentric.
6. A seat-dressing tool as defined in claim 4 in
which the pilot is integral with the eccentric and
is rotatably received in said head.
'
7. A device for dressing an annular seat on a
housing perpendicular to and generally concen
tric with a bore in said housing, comprising a
head rotatable about a iixed axis, a shoulder on
said rotor, a pilot extending beyond said shoulder
and coaxial with said rotor, an annular tool re
placably received about said pilot and against said
shoulder, means for holding said tool in driving
relationship against said shoulder, an eccentric to
rotatably ñt said pilot, said eccentric having a cy
lindrical surface eccentric with respect to the axis'
of said pilot and adapted to rotatably ñt said bore,
and means for rotating said eccentric.
and true the seats of water pump casings. It thus 30
8. A device for dressing an annular seat on a
makes it possible to continue in service many wa
housing perpendicular to and generally concen
ter pump casings which under the present prac
tric with a bore insaid housing, comprising a head
tice must be destroyed.
I’claim as my invention:
'
' 1. A device for dressing an annular shaft-seal
seat surrounding the shaft bore of a water-pump
case and concentric with said bore and with the
coaxial bearing-receiving bore of said case, com
prising a head rotatable at >dressing speed on a
ñxed axis, an annular tool thereon providing a
rotatable about a ñxed axis, an annular tool re
placably received on the end of said head and
35 providing a work-surface perpendicular 'to said
axis, means for holding said tool in driving rela
tionship on said head, an eccentric having a pilot
coaxial with its axis of leccentricity and having
a cylindrical outer surface adapted to rotatably
40 iit said bore, said head having an axial bore tore
radial work-surface, a pilot coaxial therewith, an
ceive said pilot, and means for rotating said eccen?
eccentric positioned by said pilot with its axis of
tric.
eccentricity coaxial with said head, said eccentric
9. A device for dressing an annular seat on a
having an outer cylindrical surface rotatably ñt
housing perpendicular to and generally concen
ting said bearing receiving bore to support said
tric with a bore in said housing, comprising a
pump case with its shaft-seal seat against said ‘
head rotatable at dressing speed, a dressing face
work-surface inposition to be dressed true, and a
carried by head and disposed radially with respect
crank on said eccentric whereby it may be rotated
to the axis of head rotation, a pilot coaxial with
in said bearing-,receiving bore to carry the axis
said head, an eccentric positioned by said pilot
thereof and the center of said seat over an ec- .
with its axis of eccentricity alined with said axis
centric path of revolution about the axis of rota
of rotation, said eccentric having a cylindrical
tion of said tool and head.
,
outer surface to rotatably ñt said bore whereby
2. A seat-dressing tool as defined in claim 1 in
to position said housing with said annular seat
which the pilot is integral with the head and is
in position for dressing against said face, and
rotatably received in said eccentric.
*means to rotate said eccentric to cause relative
3. A seat-dressing tool as defined in claim 1 in
revolution between the bore axis and the common
which the pilot is integra1 with the eccentric and
axis of said pilot and'head.
is rotatably received in said head. =
4.' A device for dressing an annular seat on a
'
GALEN A. BARNES.
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