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Патент USA US3063736

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Nov. 13, 1962
'
J. DUNNOUS
3,063,726 '
SHAFT MOUNTINS; ARRANGEMENT
Filed Feb: 18, 1960
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3,063,726
SHAFT MOUNTING ARRANGEMENT
Jack Dnnnous, Philadelphia, Pa., assignor to Novo In
dustrial Corporation, a corporation of New York
Filed Feb. 18, 1960, Ser. No. 9,608
9 Claims. (Cl. 277-12)
it engages. In the preferred embodiment here illustrated
the surrounding-member is formed of aluminum, the sec
ond packing element is formed of a bearing metal such
as bearing bronze, and the v?rst‘packing element is formed
The present invention relates to a structure for rotat
ably ‘supporting a shaft and preventing leakage there
around.
of graphite-?lled “Te?on” (DuPont’s trade name for a
polytetra?uoroethylene resin). The axial pressure which
forces thesecond packing element against the ?rst pack
ing element may be derived from a conventional gland
arrangement which surrounds the shaft. The second
10 packing element makes bearing engagement with the shaft.
'
‘The basic structural arrangement here involved is par
ticularly applicable to those cases where the sealing means
in on the surfaces of the surrounding member and the
which prevents leakage must withstand appreciable pres
second packing element, thereby producing smooth seal—
As the shaft rotates the ?rst packing element laps itself
sures and where the shaft is ‘mounted for rapid rotation.
ing-surfaces which offer little frictional resistance to rela~
It is here speci?cally illustrated as embodied in a device 15 ti=ve rotation, and some of thegraphite carried by the ‘?rst
for intimately mixing reactive chemical components, such
as epoxy resins and catalysts or hardeners therefor.
In
machines of this type, particularly used in conjunction
with automatic proportional metering, mixing and dispens
packing element embeds itself in the surfaces of the sur
rounding member and the second packing element, there
by further facilitating relatively free frictional rotation.
The surrounding member in which the packing elements
ing systems such as those shown in Schneider Patent 20 are received may rest upon a deformable plastic bushing,
and the axial pressure exerted on the first packing ele
in the mixer may be maintained under'pressures as high
ment is transmitted by that element to the surrounding
as 3000 p.s.i., and the mixer shaft may be rotated at speeds
ember and presses that member against the bushing,
of 1800 r.p.m. ‘or 3600 rpm. Since the mixture of resin
thus compressing the bushing and effecting a further seal.
and hardener is reactive, and sets to an extremely hard 25
To the accomplishment of the above, and to such other
condition, any leakage of the reactive mix into or through
objects as may hereinafter appear, the present invention
the shaft bearing will, when the mix hardens, effectively
relates toa structure for sealingly rotatably mounting a
freeze the shaft within the bearing, and it is an exceed
shaft, as de?ned in the appended claims and as described
ingly di?icult matter to remove the set and hardened
‘in this speci?cation, taken together with the accompany
ing drawings, in which:
resin. Accordingly, it is of the utmost importance that
the shaft be mounted in such a way as to permit its ready
‘FIG. 1 is a cross sectional view of a mixer having a
rotation, but at the same time eifectively to prevent any
rotatable paddle-like mixing element attached to a ‘shaft
leakage into the bearing.
which is supported and sealed in accordance with the
2,788,953 of April 16, 1957, the reactive composition with
Moreover, because of the high speed and comparative
present invention; and
ly small size of the rotative elements of the mixer the 35
FIG. ‘2 is an enlarged cross sectional view of theyparts
shaft mounting arrangement should exert as little fric
of the shaft mounting and sealing assembly.
tional resistance on the shaft as possible. The greater
The mixer in connection with which the instant inven
the frictional resistance, the greater the wear and hence
tion is here illustrated comprises a body .Z'to one end of
the deterioration of the structure as it is used. The great 40 ‘which a tubular wall 4 is secured by means of bolts 6,
er the frictional resistance, the larger and more expensive
the interior of that tubular Wall 4 de?ning the mixing
chamber proper. The bolts .6 secure a'cap-8 to the free
must be the motor which drives the shaft, and the greater
must be the current consumption during operation. These
end of the tubular wall 4, closing its outer end,'and seal
factors adversely affecting initial cost and operational
ing rings '10 an'dlZ are interposed between the ends of
cost respectively.
45 the tubular wall ‘4 and the cap 8 and body 2 respectively.
The construction must also be of such a nature that it
The cap '8‘is provided with an exit passage '14, and a ?t
can readily be disassembled in the event of failure com—
pletely to achieve its desired objectives, thereby to facili
tate the removal of set resin from the bearing. The length
ting '16 may be threadcdly secured thereto, a sealing ring
I'S'being engaged between the ?tting 16 and the project
ing portion of the cap 8 in order to prevent any reactive
mix‘from reaching the screw threads.
Thebody 2 is provided with anaxial recess 20 there
through defined by a ?rst part Zita and a‘second part 20b,
the secondpart 26b having a larger diameter than the
‘?rst part 20a, a shoulder 22 being de?ned between the
of time involved in repairing a mixer in the event of such
a mishap is exceedingly important, since for lack of a
mixer an entire dispensing system will be made idle and
production lines will be brought to a standstill.
In accordance with the present invention the shaft is
surrounded by a member which is ?xed relative to the 55 two parts Ztlaand 20b. Inlet ports 24, 26v and 28 pass
housing, the interface between that member and the hous
throughthe bodyl and communicate with the recess part
ing being sealed by a stationary seal which, because of its
lack of movement, is not subject to wear and therefore is
20a. Thesegports may be used for feeding into the mixer
‘the components tobe mixed and/or purging compounds.
exceptionally reliable. A circumferential space is de?ned
A mounting bracket 30 is welded or secured in any other
between this member and the shaft, and in that circum 60 manner vto the body 2.
Mixingiseffected by a paddle generally designated 32
ferential space is located a ?rst packing element which
sealingly surrounds and rotates with the shaft. A sec
which fits closely Within the mixing chamber proper de
‘?ne'd'bythe tubular wall 4, that paddle being connected
ond packing element is located in the circumferential
by, means of pins 34to a shaft 36 which-extends through
space above the first packing element and is pressed down
against the ?rst packing element in such a way as to cause 65 the ‘body recess 29 with appreciable clearance there
around. That portion ofthe shaft 36>which extends be
'it to grip the shaft more ?rmly and thus produceia reliably
yond liltiJbQClY 2 is connected to coupling38 by means
e?ective seal along the outer surface of the shaft. This
second packing member does not rotate relative to the
of .pin 40, the coupling in turn being connected to'a'driv
shaft. The ?rst packing member is formed of a deform
inggear 42 by means .of gear shaft 44 and set screws 46.
able material which closely engages and rotates with a 70
Turning now-to the bearing sealing arrangement for
minimum of friction relative to the surfaces of the sur
the shaft 36, a bushing 48 rests on the‘shoulder 22,. has
rounding member and the second packing element which
a portionextending into the recess part 20a and has apor
3,063,726
4
tion in the recess part 2%.
The bushing 48 may be I
along the surfaces of the shaft The pressure of the ?rst
formed of some deformable plastic material such as
packing element 60 against ‘the shoulder 58 produces a
“Te?on.” It closely surrounds the shaft 36, being suf
seal at that interface.
‘?ciently loose thereon so as not to rotate therewith, and
preferably is graphite-?lled so as to offer minimal fric
tional to rotation of the shaft 36.
?rst packing element 60 rotates with the shaft. Its lower
surface rides over the member shoulder 58 and its upper
Of all of the parts of the mounting assembly, only the
Positioned above and resting on the bushig 48 is the
surrounding member generally designated 50, that mem
surface 62 rides over the lower surface 66 of the second
packing element 64. As this relative rotation occurs the
ber comprising a ?rst portion 56a of reduced outer di
?rst packing member 60 laps itself in along those sur
ameter which directly engages the bushing 48, and a sec 10 faces, and some of the graphite carried thereby embeds
end portion 59b having an outer diameter closely the
itself in those surfaces. The extreme smoothness thus
same as the inner diameter of the recess part Zlib.
A
longitudinal groove 52 is formed in the outer surface of
the member portion 50b, and a locking screw 54 thread
edly mounted in the body 2 has a tip which enters the
groove 52 and thus locks the member 50 against rotation
relative to the housing 2. The second member portion
produced, together with the pressures exerted thereon,
ensure adequate sealing and smooth and substantially
frictionless relative rotation, this latter effect being
heightened by the graphite carried by the packing ele
meat 60 and to some extent transferred to the surfaces
over which the packing element 60 rotates.
50b surrounds and is radially outwardly spaced from the
shaft '36, thereby de?ning between itself and the shaft 36
a circumferential space generally designated 56 which is
The overall effect of this structure is to produce effec
tive and reliable seals along both the outer surface of
the shaft 36 and the inner surface of the body recess 20,
open at its axially upper end and which has a shoulder
capable of resisting exceedingly high pressures within
58 at its axially lower end. Sealing ring 59 is compressed
between the outer surface of the ?rst member portion
the mixer chamber and the body recess portion 201:, while
at the same time greatly minimizing the frictional resis
59a and the inner surface of the recess part 20b.
A ?rst packing element 64} is received within the cir
cumferential space 56 and is supported at its lower end
tance to rotation exerted on the shaft 36. The only
wear which occurs is to be found at the upper and lower
by the member shoulder 58. This packing element 60
surfaces of the ?rst packing element 60, and that wear
can readily be compensated for merely by tightening up
surrounds and sealingly grips the shaft 36 so as to rotate
on the gland nut 70.
therewith, and is preferably a slight press ?t on the shaft
If through some mishap the structure should not pro
36. Its outer diameter is slightly less than the inner di 30 duce a complete seal, thus necessitating disassembly and
ameter of the member portion 50b, so that the packing
cleaning of the unit, the assembly can very readily be
element 69 is rotatable relative to the member 50. It
disassembled. Removal of the gland nut 70 permits re
has an upper surface 62 which is inclined axially down
moval of the bushing 68 and second packing element 64
wardly (to the left as viewed in FIGS. 1 and 2) and
through the top of the body 2. The shaft 36 may be sep
radially outwardly relative to the shaft 36. It is formed 35 arated from the mixing paddle 32 by disassembling the
of deformable material, and material which will have a
tubular wall 4 from the body 2 and removing the pins
low coel?cient of friction relative to the parts which it
34, after which the shaft with the ?rst packing element
engages (other than the shaft 36). In the speci?c embodi
69 attached thereto may be removed through the top of
ment‘here disclosed it is formed of graphite-?lled “Tef- ~
the body 2. The locking screw 54 is backed off, and then
Ion.”
40 both the member 50 and the bushing 48 may be pushed
Also located in the circumferential space 56, and above
out through the open top of the body 2.
the ?rst packing element 60, is a second packing element
While but a single embodiment of the present inven
64 having a lower surface 66 which mates with the in
tion has been here disclosed, it will be apparent that many
clined upper surface 62 of the ?rst packing element 60.
variations may be made therein, all within the scope of
The second packing element 64 is formed of bearing metal
the instant invention, as de?ned in the following claims.
such as hearing bronze. and is adapted to remain station
I claim:
ary relative to the housing 2 and to have bearing engage
1. In combination with a housing having a recess and
ment with the shaft 36. It extends above the upper end
a shaft received and rotatable in said recess; a member
of the member 50, and bushing 68 rests thereon, that
axially supported in said recess, relatively loosely sur
bushing being interposed between the second packing
50 rounding said shaft so as not to rotate therewith, and
element 64 and a gland nut 70' which is threadedly re
ceived in upper cap 72 secured to the body 2 in any ap
propriate manner, as by means of screws 74.
When the construction here disclosed is assembled and
ready for use the gland nut 70 is screwed down and is
having a portion radially spaced from said shaft, said
preferably made hand-tight. Through the intermediation
of bushing 68, the second packing element 64, and the
?rst packing element 60, the member 50 is pressed down
wardly onto the bushing 48, pressing that bushing 48
member de?ning between itself and said shaft a circum
ferential space which is open at one end and has a shoul
der at the other end, means operative between and ?xed
relative to said member and said housing for sealing the
interface between said member and said recess, a ?rst
packing element relatively loosely received in said cir
cumferential space, operatively axially supported on said
shoulder, and relatively closely surrounding and seal
against the shoulder 22. This serves to seal the inner 60 ingly engaging said shaft so as to rotate therewith and
surface of the recess 20 and to provide a secondary seal
relative to said member, a second packing element in said
ing effect along the outer surface of the shaft 36 arising
from the radial compression of the bushing 48 accom
panying its axial compression. Leakage along the inner
surface of the recess 20 is further prevented through the
action of the sealing ring 59. Since neither the bushing
48 nor the sealing ring 59 rotate relative to the body 2,
the sealing effect which they produce relative to the body
2 has a very high degree of reliability. 7
circumferential space operatively engaged with said ?rst
packing element, said second packing element being rela
tively loosely received on said shaft so as not to rotate
therewith, and means with respect to which said shaft is
rotatable operatively engageable with said second pack
ing element for pressing it axially in the general direc
tion of said shoulder and against said ?rst packing ele
ment, said ?rst packing element being of material having
The axial pressure exerted on the ?rst packing element 70 a low coe?icient of sliding friction relative to said mem
60 by the second packing element 64 presses the first pack
ber and said second packing element, a stationary seal
ing element 60 against the member shoulder 58 and also,
thereby being provided between said member and said
by virtue of the orientation of the surfaces 62 and 66,
housing and between said shaft and said ?rst packing ele
radially compresses the packing element 60 against the
ment, the seal between relatively moving surfaces being
shaft 36, thus producing an effective and reliable seal
de?ned between said ?rst packing element and the shoul
$063,726
5
der of said member and the inner surface of the member
portion radially spaced from said shaft, on the one hand,
and said ?rst packing element on the other hand, there
by de?ning a sealing area of tortuous con?guration.
2. The combination of claim 1, in which said member
is made of metal, said ?rst packing element is made of
graphite-?lled deformable plastic material, and said sec
ond packing element is made of bearing metal.
6
element being inclined axially downwardly and radially
outwardly, a second packing element of bearing metal
in said circumferential'space operatively axially support
ed on said ?rst packing element, having bearing engage
ment with said shaft, and having a lower surface which
engages and mates with the upper surface of ‘said ?rst
packing element, and means operatively active on said
3. The combination of claim 1, in which a bearing
second packing-element for pressing it‘axia'lly downwardly,
thereby pressing said ?rst packing element against said
bushing having bearing engagement with said shaft is in
terposed between said second packing element and said
pressing said bushing between said member and said
shaft and against said shoulder on said memberand com
housing.
axial pressing means.
7. In combination, a housing having an elongated re
'4. The combination of claim 1, in which said recess has
cess, a shaft rotatably received within said recess with
a shoulder located opposite said axial pressing means,
a bushing of deformable plastic material resting on said 15 peripheral clearance therearound along at least a sub
stantial portion of its length, a ?rst bushing supported in
shoulder and relatively loosely surrounding said shaft so
said clearance portion of said recess against downward
as not to rotate therewith, said axial pressing means press
axial movement and having bearing engagement with
ing said member against said bushing, said bushing there
by axially supporting said member and being axially com
said shaft, a member in said ‘clearance portion of said
pressed by said member.
20 recess above and operatively resting on said ?rst bush~
ing, said member surrounding said shaft beingnon-rotat
5. In combination, a housing having an elongated re~
able therewith, and‘havinga'portion radially spaced from
cess, a shaft rotatably received within saidlrecess with
said'shaft so as to de?ne between itself and said shaft
peripheral clearance therearound along at least a substan
a circumferential space open at its upper-end and having
tial portion of its length, a bushing of deformable plas
tic material supported in said clearance portion of said
recess against downward axial movement and having bear
ing engagement with said shaft, a member in said clear
ance portion of said recess above and operatively resting
a shoulder at its lower end, means on said'housing ‘engag
ing said member so as to prevent rotation thereof, said
member '-being'adjustably axially movable along said re
cess, a sealing element sealing the interface between the
outer surface of said member and the inner surface of said
on said bushing, said member surrounding said shaft, being
non-rotatable therewith and having a portion radially 30 recess, a ?rst packing element rotatably received in said
spaced from said shaft so as to de?ne ‘between itself and
ircumferential space, resting on said shoulder, and seal
ingly engaging and rotating with said shaft, the upper sur
said shaft a circumferential space open at its upper end
face of said ?rst packing element being inclined axially
and having a shoulder at its lower end, means on said
downwardly and radially outwardly, a second packing
housing engaging said member so as to prevent rotation
thereof, said member being adjustably axially movable 35 element in said circumferential space, operatively axially
supported on said ?rst packing element, having bearing
along said recess, a sealing element sealing the inter
face between the outer surface of said member and the
inner surface of said recess, a ?rst packing element of
engagement with said shaft, and having a lower surface
which engages and mates with the upper surface of said
deformable plastic material rotatably received in said
?rst packing element, a second bushing in said clearance
circumferential space, resting on said shoulder, and seal 40 portion of said recess above said member and said sec
ingly engaging and rotating with said shaft, the upper
ond packing element, said second bushing having bearing
surface of said ?rst packing element being inclined ax
engagement with said shaft and operatively resting on
said second packing element, and means operatively ac~
tive on said second packing element via said second bush
ially downwardly and radially outwardly, a second pack
ing element of bearing material in said circumferential
space, operatively axially supported on said ?rst pack 45 ing for pressing it axially downwardly, thereby pressing
said ?rst packing element against said shaft and against
ing element, having bearing engagement with said shaft,
and having a lower surface which engages and mates
with the upper surface of said ?rst packing element, and
means operatively active on said second packing element
said shoulder on said member and compressing said ?rst
bushing between said member and said housing.
8. In combination, a housing having an elongated re
for pressing it axially downwardly, thereby pressing said 50 cess, a shaft rotatably received within said recess with
?rst packing element against said shaft and against said
shoulder on said member and compressing said bushing
between said member and said housing.
6. In combinantion, a housing having an elongated
peripheral clearance therearound along at least a substan
tial portion of its length, a ?rst bushing of deformable
plastic material supported in said clearance portion of
said recess against downward axial movement and hav
recess, a shaft rotatably received within said recess with 55 ing bearing engagement with said shaft, a member in said
clearance portion of said recess above and operatively
peripheral clearance therearound along at least a sub
stantial portion of its length, a bushing of graphite-?lled
deformable plastic material supported in said clearance
resting on said ?rst bushing, said member surrounding
said shaft, being non-rotatable therewith, and having a
portion radially spaced from said shaft so as to de?ne
portion of said recess against downward axial move
ment and having bearing engagement with said shaft, a 60 between itself and said shaft a circumferential space open
member in said clearance portion of said recess above
at its upper end and having a shoulder at its lower end,
and operatively resting on said bushing, said member
means on said housing engaging said member so as to pre
surrounding said shaft, being non-rotatable therewith,
vent rotation thereof, said member being adjustably ax
and having a portion radially spaced from said shaft so as
ially movable along said recess, a sealing element sealing
to de?ne between itself and said shaft a circumferential 65 the interface between the outer surface of said member
space open at its upper end and having a shoulder at
and the inner surface of said recess, a ?rst packing ele
its lower end, means on said housing engaging said mem
ment of deformable plastic material rotatably received
ber so as to prevent rotation thereof, said member being
in said circumferential space, resting on said shoulder,
adjustably axially movable along said recess, a sealing
and sealingly engaging and rotating with said shaft, the
element sealing the ‘interface between the outer surface 70 upper surface of said ?rst packing element being inclined
axially downwardly and radially outwardly, a second
of said member and the inner surface of said recess, a
?rst packing element of graphite-?lled deformable plastic
packing element of bearing material in said circumferen
tial space, operatively axially supported on said ?rst
material rotatably received in said circumferential space,
resting on said shoulder, and sealingly engaging and rotat
packing element, having bearing engagement with said
ing with said shaft, the upper surface of said ?rst packing 75 shaft, and having a lower surface which engages and
3,063,726
7
mates with the upper surface of said ?rst packing element,
a second bushing in said clearance portion of said recess
- above said member and said second packing element, said
second bushing having bearing engagement with said
shaft, and operatively resting on said second packing ele- '
ment, and means operatively active on said second pack
ing element via said second bushing for pressing axially
downwardly, thereby pressing said ?rst packing element
said member and the inner surface of said recess, a ?rst
packing element of graphite-?lled deformable plastic ma
terial rotatably received in said circumferential space,
resting on said shoulder, and sealingly engaging and ro
tating with said shaft, the upper surface of said ?rst
packing element being inclined axially downwardly and
radially outwardly, a second packing element of bearing
material in said circumferential space, operatively axially
supported on said ?rst packing element, having bearing
against said shaft and against said shoulder on said mem
ber and compressing said ?rst bushing between said mem 10 engagement with said shaft, and having a lower surface
ber and said housing.
which engages and mates with the upper surface of said
9. In combination, a housing having an elongated
?rst packing element, a second bushing in said clearance
recess, a shaft rotatably received within said recess with
peripheral clearance therearound along at least a sub
stantial portion of its length, a ?rst bushing of graphite
?lled deformable plastic material supported in said clear
ance portion of said recess against downward axial move
ment and having bearing engagement with said shaft, a
member in said clearance portion of said recess above
and operatively resting on said ?rst bushing, said member
surrounding said shaft, being non-rotatable therewith,
and having a portion radially spaced from said shaft so as
to de?ne between itself and said shaft a circumferential
space open at its upper end and having a shoulder at its
lower end, means on said housing engaging said member
so as to prevent rotation thereof, said member being ad
justably axially movable along said recess, a sealing ele
ment sealing the interface between the outer surface of
portion of said recess above said member and said sec
ond packing element, said second bushing having bearing
engagement with said shaft and operatively resting on
.said second packing element, and means operatively ac
tive on said second packing element via said second bush
ing for pressing it axially downwardly, thereby pressing
said ?rst packing element against said shaft and against
said shoulder on said member and compressing said ?rst
- bushing between said member and said housing.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,486,312
Ullman ______________ __ Mar. 11, 1924
1,788,966
Wilson ______ __, _______ __ Jan. 13, 1931
2,048,320
2,744,774
Bennett ______________ __ July 21, 1936
Wist ______ ._'___-__-__'..=__ May 8, i956
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