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Патент USA US2122249

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June 28, 1938.
2,122,249
J. P. FABER
SEAL FOR'ROTARY CONCRETE MIXING DRUMS
Filed Dec. 24,, 1935
7:,
INVENTOR.
BY
m
‘
ATTORNEY.
2,122,249
Patented June 28, 1938
UHTED STATES PATET QFFIQE
2,122,249
SEAL FOR ROTARY CONCRETE» MIXING
DRUMS
, John P. Faber, Dunellen, N. J., assignor to Ban
some Concrete Machinery Company, Plain
?eld, N. .l., a corporation of New Jersey
Application December 24, 1935, Serial No. 55,979
5 Claims. (Cl. 285—1)
present improvements employ, in the illustrated
The improvements relate to means for pro—
viding a substantially liquid-tight seal or packing
between a rotating member and a stationary
part, and more particularly to a seal of this char
acter between the fixed feed chute or hopper and
the feed opening _of a rotating concrete mixing
drum. They may however be used in connection
with the discharge chute and opening if desired.
and for any other purpose to which they are
31:0
adaptable.
_
In modern concrete mixing it has been found
advantageous to seal the feed or charging open
ing of the drum to ‘prevent the wet aggregates or
“soup” from splashing out as the aggregates are
preferred embodiment, an annulus of sheet or
thin cast metal secured to the external periphery
of the cylindrical discharge end of the feed chute
and projecting therefrom in vertical plane to
form a flange throughout the circumference of
the chute, and the feed opening is provided with
a pair of spaced rings of rubber or other suitable
compressible and resilient material extending
around its edge and projecting inwardly there 10
from, and receiving snugly between them the
annulus. As the charge opening and the said
flange of the chute are both annular and are
raised by the mixing buckets or blades, dropped
concentric and the compressible rings are formed
on aligned radii the seal is maintained at all times 15
from the upper part of the drum and more or
and. is not affected by the rotation of the drum,
less violently agitated and moved about in differ
ent directions, to produce a thorough and uni
form commingling of all the aggregates. But as
the drum rotates quite rapidly and the feed chute
which rotation is on a horizontal axis running
through the centers on which the annular ?ange,
the said rings and the edges of the opening are
which extends through the mouth or feed open
ing of the drum must be mounted in ?xed posi
tion to receive and deliver into the drum the un
mixed aggregates, the problem of providing an
- effective and durable liquid-tight seal between
the two has been a serious one, on account of the
relatively large diameter of the chute and the
opening, the vibration caused by the rotation of
the drum with its heavy load and the dumping of
the unmixed aggregates into the chute in large
batches, and the extremely gritty character of the
small aggregates in the liquid portion of the mix
ture which are principally hard sand and minute
fragments of rock mixed‘ with cement and water.
Various attempts have been made to provide a
seal of this character which will be effective at
all times and under‘all conditions and will be suf
?ciently durable in use to keep the cost for up
keep and replacement within reasonable limits,
drawn. The pair of compressible rings is secured 20
to the head of the drum around the opening by
being clamped against the inner and outer faces
of said head immediately adjacent to and sur
rounding the said opening, one ring being on the
outer face and the other on the inner face there
of, and the rings extend beyond the edge of the
opening and toward the chute a short distance to
provide contact surfaces between them and the
annular ?ange sufficient to form an eiiective seal.
This extension of the ?exible rings also provides 30
fora certain degree of flexibility to compensate
for vibration and the slight lateral movements of
the drum in rotating or due to other causes. The
flexible rings are clamped to the head of the drum
at the edge of the opening by means of ?at annu 35
lar metal plates one on the outer side of the outer
ring and the other on the inner side of the inner
ring with bolts at intervals passing through the
said ring and plates and through holes in the
drum head, one or both of the said plates prefer
lem has heretofore been devised. Seals which ably extending to the edges of their respective
are initially fairly satisfactory have been made at rings or in proximity thereto to reinforce and
a cost comparable with the cost of the present protect them and preserve their shape. The in
seal, but as their life is very short, the cost as . terposition of the rings however between the
high as sixty dollars for a one yard machine and plates at their points of securement gives the
the labor and delay involved in replacement a latter a slight degree of flexibility in addition to
the'flexibility of the relatively thin metal of which
serious item they have not been found satisfac
tory. Nor have such devices been so designed as they are made.
The objects and advantages of the improve
to provide a tight seal under all conditions of use,
as where the mixing drum is carrying an overload ments will be apparent from the foregoing, and 50
of the usual wet mixture bringing the level of from the following description and accompany
ing drawing which describe and illustrate an
such mixture when at rest up to or above the
but so far as I am aware no solution of this prob
lower edge of the opening.
To overcome the di?lculties above indicated
55 and provide an e?ective and durable seal, the
exemplary embodiment thereof.
In the said drawing, Fig. l is a vertical medial
cross section taken longitudinally through the 55
2
2,122,249
head of a concrete mixing drum and feed chute
embodying the improvements;
Fig. 2 is an end elevation thereof, with part
of the chute broken away; and
Fig. 3 is an enlarged detail in section similar to
that of Fig. l of certain parts.
In the said drawing l is the feed chute, 2 the
head of the drum, 3 the annular sealing ?ange
on the chute, 1%, 4a, the pair of rubber sealing
rings, 5 the outside and 6 the inside metal c1amp-_
ing ring, 7 one of the securing bolts for the
rings and their reinforcing plates and 8 a union
for a water pipe leading to the chute through
the mouth 9, through which water is discharged
15 into the drum for the batches of solid aggregates.
The bolts 1 are located at short intervals
around the edge of the feed opening, and have
their heads on the inner side of the plate 6
which should be made in two semi-circular sec
20 tions for insertion and removal through the
opening—extend through the plate 5, compress
ible ring 4, drum head 2, compressible ring 4a
and plate 5 and beyond the last named plate,
the outer end of each bolt being threaded to re
ceive a nut la, and a spring nut lock ‘lb being
located between the said nut and the plate 5 on
the bolt. The plates 5 and E extend approximate
ly to the inner edges of the compressible rings,
but I prefer to have the rings extend slightly
59
beyond the plates so that there will be less wear
on their extreme inner edges, and small gritty
particles of aggregates will be swept away from
the ?ange 3 thereby and permitted to fall when
the portion of the rings on which they have
lodged reach a position above the middle of the
opening. The space between the compressible
rings is slightly greater than the thickness of the
?ange 3, this being provided for by having the
?ange slightly less in thickness than the head of
40 the drum 2. Thus the head of the drum in prac
tice is about 1/;th inch in‘thickness while the
?ange is lisths. The plates 5 and 6 are of about
the same gauge as the ?ange, and are of spring
metal, so that they have a slight degree of ?ex
ibility.
This ?exibility, however, is increased,
and the entire extending portion of the compress
ible packing rings and their plates is permitted
when the portions of the rings which lap the
head are compressed, the extending portions will
be brought closer together, so that a satisfactory
seal can be maintained in spite of considerable
Wear, and the life of the packing thus prolonged.
While the construction and arrangement here
in described and shown is the best mode in which
I have contemplated applying the principle of
the invention, it will be apparent that it may be
modified in various ways and applied to or com 10
bined with other devices, without departing from
that principle.
What I claim is:
l. A seal for the head of a rotatable drum
for mixing concrete having a central opening 15
therein and a non-rotating chute extending
therethrough, comprising an annular ?ange on
the chute, a plurality of packing rings of elas
tic material mounted on said head and extending
beyond the edges of said opening spaced apart 20
and providing a space between them for the re
ception of said ?ange corresponding substan
tially to the thickness of said ?ange and metal
lic reenforcing members for said rings mounted
in close contact therewith, means for constantly 25
pressing said members against said rings, one
of said members being on the 'outer side of each
ring and also extending therewith beyond the
edges of the opening, said members overlapping
said ?ange.
30
2. A seal for the head of a rotatable drum for
mixing concrete having a central opening there
in and a non-rotating chute extending there
through, comprising an annular ?ange on said
chute, a plurality of packing rings of elastic 35
material mounted on said head and extending
beyond the same over said opening spaced apart
and providing a space between them correspond
ing substantially to the thickness of said ?ange
and metallic reenforcing members for said rings 40
mounted in close contact therewith, means for
constantly pressing said members against said
rings beyond the edges of the opening, and means
for securing said rings adjustably and remov
ably to said head at least one of said members 45
overlapping said ?ange.
3. A seal for the head of a rotatable drum for
to move or ?ex to the desired extent by the fact
that the rings of compressible material are be
tween the plates 5 and 6 and the drum head 2.
Adjustment for the wear of the rings 5 and 6
due to friction between them and the ?ange 3
mixing concrete having a central opening there
in and a non-rotating chute extending there
through, comprising an annular ?ange on the 50
chute, a plurality of packing rings of elastic
is provided by the means of attaching them to
the drum head, and especially the spring nut lock
and extending beyond the edges of said opening
spaced apart and providing a space between them
for the reception of and corresponding substan .55
tially to the thickness of said ?ange and a metal
lic clamping and reenforcing member for said
rings mounted therewith and extending there
.55 lb.
‘When a new packing or seal is applied to
the head of the drum and secured by the screw
bolts '1, the pressure of the plates 5 and 6 will
cause the compressible material of the rings 4
and (la to be compressed to some extent between
.60 the plates and the head 2. This permits the said
plates to approach each other slightly and nar
row the space between the extending portions of
the packing rings, which is not compressed, and
thus establish a snug relation between the rings
65 and the ?ange 3. The exact desired tightness
of the seal can thus be attained by regulating the
pressure of the nuts ‘la. At the same time a fur
ther slight yielding of the plates is provided for
by the spring nut locks ‘lb. These nut locks per
mit the user to tighten up the packing when it
is worn down by friction between it and the ?ange
3 by turning up the nuts, as Well as providing a
certain yielding of the entire packing to com
pensate for vibration and slight movement of the
drum and feed chute, it being apparent that
material mounted one on each side of said head
with over said ?ange, means for removably se
curing said rings and reinforcing member to said 60
head, and a spring device for pressing said rings
associated with said securing means and having
locking engagement therewith.
4. A seal for the sheet metal head of a rotat
able drum for mixing concrete, having a central 65
opening therein and a non-rotating chute ex
tending through said opening, comprising an
annular ?ange on the chute, a plurality of pack
ing rings of elastic material mounted one on each
side of the head adjacent to and extending be 70
yond the edges of said opening, so that said rings
are spaced apart by said head and provide an
annular space between them in which the outer
part of said ?ange is received, means for com
pressing said rings against said head and thereby 75
3
2,122,249
causing their said extending portions to approach
each other and reduce the space in which the
?ange is received, to take up wear or make a
closer seal between said parts, said means in
UK
cluding relatively rigid members secured to said
head and extending inwardly beyond the edges
of said opening over a major portion of and in
contact with said rings, a portion of said rings
being free to move laterally to compensate for
10 lateral movement of the ?ange without discon
tending beyond‘the same with said packing ring,
a chute extending through said opening but
spaced from the edges thereof, an annular ?ange
on said chute in plane with the head, said pack
ing ring and reinforcing plate overlapping said
?ange, and means for securing said‘ ring and
plate to the head, causing pressure upon said ring
beyond the edges of the opening to press it
against said ?ange, maintain a seal between said
ring and ?ange and take up wear, comprising a 10
necting them.
bolt extending through the ring, head and plate,
'5. In a device of the character described, a
sheet metal head having a central opening, an
between the head and the plate constantly press
elastic packing ring secured near the edges of
the opening and extending well beyond the same
and clear of said head, a reinforcing plate also
secured near the edges of the opening and ex
a head on said bolt and a spring on said bolt
ing the extending portion of said plate against
said ring.
JOHN P. FABER.
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