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Патент USA US2411214

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Nov. 19, 1946;-
‘ Filed'llarch 4, 1943
Patented Nov. 19, 1946
- 2,411,214
Dana E. Keech, Riverside, Calif., assignor to vFood
Machinery Corporation, San Jose, Calif., a cor
poration of Delaware
Application March 4, 1943, Serial No. 477,940
. 1 Claim.
(01. 286-11)
This invention relates'to ?exible seals, and is
particularly useful- in protecting chain bearings.
It is a broad object of the invention to provide
a ?exible seal which will completely exclude pas
sage of liquid or solid material inwardly or out
wardly through an annular area surrounding an
' side walls extending beyond said back plate and
having co-axial openings 25 and 26. Driven into
these openings is a bearing sleeve 21, ends 28 of
this sleeve having substantially the same outside
diameters and being left extending outwardly
from outer faces of the walls 23. ‘The sleeve
21 has a journal bore 35, and a lubricant groove
35 which is packed with grease when the chain
axis of rotation between two adjacent members.
In heavy chains, such as used in the track
laying belts employed on tractors, military tanks
is assembled. Journalling in this bore is a link
and amphibians, the problem of protecting the 10 pin 4|] of an adjacent link 2|. The pin 40 pref
chain bearings by keeping these lubricated and
erably has a head 4| with a shoulder 42 formed
preventing “abrasive material gaining access
between this head and the shank 43 of the pin.
thereto, is a di?icult one as it is necessary for
This shank is turned down at the opposite end
‘ these chains to operate constantly in the presence
44 of the pin to provide a shoulder 45. When
of large quantities of abrasives and, not infre 15 the chain is assembled, the pin end 44 is swedged
quently, under water. _
to provide a rivet head 46.
It is another object of my invention to provide
Each link 2| includes side plates 54 and 55
a chain bearing seal which will retain lubricant
which are formed integral with and united. by
within the bearing and exclude foreign matter
back straps 55 (see Fig. l), which are adapted
from said bearings over long periods of opera 20 to have the grousers I 8 mounted thereon. The
tion under difficult conditions.
side plates 54 and 55 overlie the sleeve ends 28
It is a further object of my invention to pro
(see Fig. 2), and have concentric openings 58
vide such a chain bearing seal which is especially
and 59 into which the pin head 4!, shoulder 42
adapted for use on the chains employed in track
and pin end 44 snugly ?t when the chain is as
25 sembled. When the swedged head 46 is formed
laying belts as aforesaid.
The manner of accomplishing the foregoing
on the pin 40 in the assembly of the chain, this
objects, as well as further objects and advan
binds the plate 55 between this head and the
tages, will be made manifest in the following de—
shoulder 45 on the pin and con?nes the sleeve 21
scription taken in connection with the accom
between the side plates 54 and 55 with the pre
panying drawing in which:
30 cise spacing provided on the pin 40 between the
Fig. 1 is a fragmentary side elevational view of
shoulders 42 and 45. This is just enough to per
a track-laying» belt such as used on amphibians,
mit free'rotation between the sleeve 21 and the
this belt including an endless chainincorporating
link 2! as long as the bearing surfaces are lubri
the preferred embodiment of my invention.
Fig. 2 is an enlarged cross sectional view taken
When assembling the chain [0, sealing ele
on the line 2-—2 of Fig. 1.
ments 65 are placed over the sleeve ends 28 and
Fig. 3 is a cross sectional view showing a pre
compressed between opposed radial faces 66. and
ferred form of the seal element of my invention,
61 of the plates 54 and 55 and the side walls 23.
as this element appears before it is compressed ”
Although not essential to the invention, I also
when assembled with the chain.
40 prefer to position a circular metal band 58 about
Fig. 4 is a view ‘similar to Fig. 3, illustrating a
each of the elements 65- when it is thus assem
modi?ed form of the seal element of my inven
bled with the chain It).
The elements 55 are preferably made as shown
45 in Fig. 3, to include a unitary ring 16 made ‘of
molded rubber or a suitable substitute therefor,
Referring speci?cally to the drawing,~Fig. '1
and are preferably made of a grease-resistant
shows a'chain III which is part of a track-laying
synthetic rubber. The material in this ring is
belt H, such as is suitable for use on an am
preferably of a soft synthetic rubber of a durom
' phibian (not shown). The chain 10 is shown as
- Fig. 5 is a diagrammatic cross sectional view of
another modi?ed form of my invention.
traveling around a sprocket l1 and having grous
eter hardness of from 25 to 40. The term “rub
ers 18 secured thereto by bolts I9.
her" when used hereinafter without quali?cation..~ '
This chain -
includes inside or bearing links 20 and outside
or plate links 2|. Each bearing link 20 includes
a channel-shaped body 22 having side walls 23
is to be construed broadly as covering any of the
various types of resilient materials suitable for
use in the rings '16. The'side surfaces 11 of the
joined by a back plate 24., opposite ends of the 55 ring ‘[6 are preferably bevelled, as shown, but
under some circumstances it may be desirable
tween the element 66 and these link faces. When
to have these lie in radial planes.
thus designed it would be possible by excessive
The rubber ring ‘I6 is formed with an internal
?exing of the links to damage the rubber ring ‘I6
annular channel ‘I8, which divides the ring ‘I6
as by rupturing the outer ?exing wall 80 thereof.
into relatively thick side walls ‘I9 and a relatively
In the design illustrated in Figs. 1, 2 and 3, an
thin annular ?exing wall 80. Faces 8| of the
insuf?cient amount of friction is produced be
walls ‘I9 are preferably also'bevelled (see' Fig. 3).
tween the rubber. ring faces 11 and the link faces
Inserted into the channel ‘I8 is a thrust bearing
66 and 61 to prevent slippage between these faces
85. This is preferably of the plural ring type as ' .when the links are ?exed excessively relative to
shown in Fig. 3, or it may comprise any other 10 each other. This design is preferable in that it
suitable type of bearing. '
will prevent the damaging of the sealing elements
The bearing 85 is shown as comprising steel
‘ 65 which might otherwise take place when the
rings 88 disposed on opposite sides of, a self-lubri- »
chains I0 are removed and coiled upincidental
eating, porous-bronze ring 89.
to the servicing. and repair of the vehicles‘
When the chain I0 is assembled with seal ele 15 equipped with these chains.
ments 65 disposed over the bushing ends 28, as
The sealing element 95 illustrated in Fig.4, is
shown in Fig. 2, the side walls ‘I9 of the rubber
similar to the sealing element 65, excepting that
ring ‘I6 are compressed between the link faces 66
it has a bail thrust bearing 96 in place of the ?at
and’ 61- and the bearing rings 88 so as to set up a
» ring thrust bearing 85 and has wall surfaces 91
relatively high .degree of friction between the 20 of larger inside diameter than the bearing 86.
rubber ring faces ‘II and the link faces 66 and 61.
This latter feature is to prevent too much fric
At the same time, there is a relatively small
tion developing between the seal 95 and a sleeve
amount of friction between the bronze ring 89
end‘ 28 when assembled thereon and compressed
and the steel rings 88 of the bearing 85. Thus
axially.v The sealing element 95 operates in iden
when adjacent links 20 and 2| of the chain I0 are 25 tically the same manner as the sealing element 65
‘?exed relative to each other by rotational move
> which is described hereinabove. The thrust bear
ment about the 'axis'of the pin-40, there is a high
ing 96, of course,v will develop less friction than
degree of resistance to slippage between the seal - the thrust bearing 85, but would be somewhat
element faces ‘II and the link faces 66 and 61.
more expensive and less convenient to install and
This results in a torsional flexing of the annular 30 less dependable in. service. In',,ca-ses 'where' re
ring walls 80 which, as shown in Fig. 2, are ex
duction of the friction in the bearing of the seal
panded outwardly from contact .with the bearings
ing element is of great importance, however, the
85 by the compression of the rubber side walls ‘I9
ball thrust bearing 96 might be superior tothe
when‘the chain ‘is assembled. The walls 80 may '
flat ring thrust bearing 85. '
be allowed to expand outwardly into contact with 35 While the sealing element of my invention pref
the circular steel bands 68 without hurting the
erably operates in planes disposed radially rela
operation of the invention. This is because the
tive to the axis of rotation involved, the surfaces
relatively soft character of the rubber used in
between which the sealing ring of my invention
the ring ‘I6 makes the walls ‘80 contact the bands
is compressed might comprise concentric cylin
- 68 with a relatively light pressure, so that any 40 drical surfaces in which case the channel ‘I8 would
rubbing between these elements does not produce .
open at one end of the rubber ring ‘I6, instead of
any substantial wearing of either.
While I preferably employ two of the rings 88.
centrally, and the bearing of ‘my ‘sealing element
instead of being an axial thrust bearing,’ would ~
v with one of the rings 89 in each bearing 85, this»
bearing mightbe made with only two rings,'one
be a radial bearing.
of which is steel and the other of which is bronze ‘
and obtain practical results.
A sealing element I00 of this-type is shown in ‘
Fig. 5-.‘ This element is compressed between 00
45' ..
'I have found in actual use of the invention, as
illustrated in Figs. 1, 2'_ and 3, with- the rubber ‘
ring ‘I6 made of “neoprene” with a durometer 50
hardness of 30, as well as in other instances with
a durometer hardness of 40, that‘ a ?exing of the
links equipped with these elements of 30° on each
axial cylindrical surfaces IM and I02 of elements
I03 and I04 and includes a channelled rubber
ring I05 enclosing a radial ‘ball bearing.r L06.
I claim:.
. A seal for an annular area surrounding an axis
ofrotation between two members providing op
posed adjacent surfaces and having rotational
side of neutral could be obtained without damage
movement relative to each other about said'axis,
being done to the ring ‘I6, and without causing 55 said seal comprising: a non-yielding bearing dis
any slippage between the ring‘ faces 11 and the
posed in said area and having opposite outside
link faces 66 and“.
faces disposed in spaced relation with said sur
The seal element 66 of my invention may be
faces; and a rubber. annulus having annular por
designed so that the friction between the ring
tions compressed between said faces and said sur
faces ‘II and the link faces 66 and 61 is so great 60 faces and an annular impervious ?exing portion
that no matter howmuch the links be ?exed rela-~
‘connecting the annular portions aforesaid.
tive to each other there will be no slippage .be
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