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Патент USA US2131732

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Oct. 4, 1938.
c. H. HAMMELL
‘
TUMBLING
MILL
Filed March 7, 1953
"Mb
' 2,131,732
'
3 Sheets-Sheet l
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lNvENToR '
ATTORNEY
Oct. 4, 1938.
.
'
c. H. HAMMELL
TUMBLING
@fr
MILL
Filed March 7, 1953
'
`
2,131,732
’
3 Sheets-Sheet 2
3
Il
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.
BY
INVENTOR
Ä Hummel!
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ATTORNEY
'
Oct. 4, 1938.
c. H. HAMMELL "
'
_
TUMBLING
MILL
Filed March 7, 1933
2,131,732
l
‘
3 Sheets-Sheet 3"' Y
64
ATTORNEY
Patented Oct. 4, 1938
' 2,131,732.
UNITED STATES PATENT OFFICE
TUNIBLING MILL
'
Charles H. Hammell, Mishawaka, Ind., assigner
to The American Foundry Equipment >Com
pany, Mishawaka, Ind., a. corporation of Dela
Ware
. 'Application -March 7, weasel-_iai No. 194,309
o
16 Claims.
and a movable side wall provided by the conveyor.
The tumbling barrels thus formed between the
discs are positioned equidistant from each other
and radially from the horizontal axis of the
wheel formed by thevdiscs. Consequently, the 5
This invention relates to tumbling mills for
cleaning and smoothing castings, forgings and the
like.
`
f
In cleaning, polishing, hardening or otherwise
5 treating small metal articles such as’castings,
barrels may travel in a circular orbit when the
forgings and the like, the process may be carried - large conveyor supportingïwheel rotates on its
out in a tumbling mill in which the articles are
placed and subjected to the action of projected axis.
Additionally, the conveyor belt may be caused
abrasive particles while the articles are being
tumbled.
' to travel when the large wheel carrying it is l0
.
When a single tumbling barrel is used it has
been common practice to charge the articles to
be treated into the barrel when the supply of
stopped for the purpose of tumbling articles in
the barrels thus formed when they are in the
cleaning position and to assist in discharging
cleaned articles from the barrels when the barrels
are in the discharging position in their orbit of 16
projecting abrasive is shut off. After charging
'the barrel, the abrasive may be projected with
suñicient impact to clean the articles such as travel about the common horizontal axis of the
.
,
castings while they are being tumbled. After the >large wheel.
The _wheel assembly is arranged for step by
‘articles have been treated the requisite length of
step rotation, if desired, thus to stop the barrels
time, the discharge of the treated castings re
quires shutting off the abrasive supply while the' intermittently >at predetermined positions in their 20
tumbling barrel is being unloaded. It is, there y,orbit of travel. Mounted above the wheel are
fore, desirable to avoid these shut downs and abrasive throwing devices positioned to project
maintain the abrasive throwing mechanism in abrasive into one or more of the barrels to clean
operation continuously whereby to do active work castings or other articles therein while they are
being simultaneously tumbled by the travelling 25
25 without the necessity of relatively long shut downs ` conveyor. Provision is made to charge an empty
incident to charging and discharging the tum
bling barrel operating on the so-called batch barrel at another position or station in the orbit
.while the cleaning operation just mentioned is
system.
proceeding. Further provision is made to dis
The present invention accomplishes the fore
going desirable end by providing a plurality of charge at the same time treated castings at an- 30
,
pockets or tumbling barrels mounted so as to be other station.
Moreover, suitable means are provided for re
capable of being b-rought successively in and out
moving .the abrasive which has been projected
of the path of abrasive' projected at blasting ve
locities. Provision is made to charge the barrels into the mill and for returning it to the abrasive
consecutively at a predetermined position while projecting mechanism whereby the abrasive can 35
the barrels which have been charged are receiv
ing abrasive cleaning treatment at another posi
tion> or positions in the path of travel of the
barrels. Simultaneously a barrel containing
treated articles may be discharged at another
position. Thus, the cleaning or blasting action
may be continuous and the time incident to charg
ing and discharging is not spent at the expense
of shutting down the abrasive projecting mecha
msm.
According to one form of the invention, the
mill comprises a stationary casing in which is
positioned a relatively large conveyor supporting
- wheel made up of two discs or frames in parallel
spaced relation mounted to rotate on a horizontal
axis. A continuous conveyor or belt is trained
over sprockets mounted in the discs and over ro
tatable barrel heads also mounted on the discs.
These are arranged to form, in effect, a plurality
55 ' of tumbling barrels each having rotatable heads
be used in a continuous cycle.
The invention also consists in certain new and
original features of construction and combina
tions of parts hereinafter set forth and claimed.
Although the novel features which are believed 40
to be characteristic of this invention will be par
ticularly _pointed out in the claims appended
hereto, the invention itself, as to its objects and
advantages, and the manner in which it may be
carried out, may be better understood by refer- 45
ring to the following description taken in con
nection with the accompanying drawings forming
a part thereof, in which:
Fig. 1 is a view partly in elevation and partly
in section of one form of mill according to the 50
invention;
'
y
Fig. 2 is a View in cross-section on line 2-2
of Fig. l;
`
Fig. 3 is a view in cross-section on line
Fig. 2; and
.
-
3-’3 of
55
2.
2,181,739
Fig. 4 is a view in part in elevation of one disc
of the wheel assembly.
In the following description and in the claims,
various-details will be identified by specific names
for convenience, but they are intended to be as
generic in their application as the art will per
mit. Like reference characters denote like parts
in the several figures of the drawing .
'
Referring to the drawings, the conveyor sup
10 porting wheel assembly may be mounted on
ñxed stationary hollow stub shafts I0 and II
which may be supported in heavy pedestals I2
and I3 resting on a suitable foundation or heavy
cross beams. 'I‘hese hollow shafts are large
15 enough to accommodate a screw conveyor I4.
By connecting the inner ends of the stub shafts
I0 and II which have a common axis with a pan
I5 a trough is formed to catch abrasive which
may be returned to a feed hopper I6 through
20 suitable‘conduit and elevator means.
Two side wall members which may be in the
form oi' discs I1 and I8 _may be mounted in par
allel spaced relation to rotate on suitable bear
ings which may be roller bearings I9 and 20 posi
The continuous conveyor belt may be. of the
link type carrying on each side, link sprocket
chains 4I and 42 running over sprockets 23 and
24. A suitable construction for such a belt is
disclosed in Letters Patent to Louis D. Peik. No.
1,882,443.
-
From the foregoing description it will be ap
parent that the continuous conveyor belt, to
gether with the rotating barrel heads form a plu
rality of individual pockets or tumbling barrels 10
mounted in the wheel assembly as shown gener
ally in Fig. 2.
In order that the wheel assembly 28 may be
caused to rotate intermittently or by a step by
step movement about its axis of rotation a plu 15
rality of lugs 43 (see Fig. 4) may be mounted
on the side wall disc I8 in a circular path.
A
spring pressed stop pin 44, mounted in the side
wall 45 of the housing or casing 46, in which
the wheel assembly is mounted, may coact with 20
the lugs 43 to stop the movement of -the wheel
assembly. Thus, when the stop pin 44 is allowed
to engage the side wall I8 of the wheel a. lug
will engage the pin and prevent movement ,of
Hence, when the drive 25
chain 25 is driven by the motor 28, sprockets 29
25 tioned at the inner ends- respectively of hollow ‘the wheel assembly.
30
35
40
45
shafts I0 and II. These side wall members may
be connected by shafts 2| and 22, each shaft car- Y cause the sprockets 23 and 24 on shafts 2I and
rying spaced sprockets 23 and 24 fixed thereto. 22 to rotate with consequent linear movement of
The assembly forms a conveyor supporting wheel the conveyor belt 34. 'I'he .lugs 43 are spaced
rotatable on a common axis of rotation through to stop the respective tumbling barrels at pre
the centers of the shafts I0 and II. Each of the determined stations in the orbitof their revo
shafts 2| may be provided with a sprocket 29 lution about the axis of rotation of the wheel
mounted on the outer side of the side wall mem
assembly. When the stop pin 44 is pulled out
ber I1. A chain drive 2_5 (indicated by dot and and disengaged from the stop lugs the wheel
dash line) is trained over the sprockets 28 and assembly will rotate because the resistance of the
may be driven by a motor 28. An idler 21 may lrelatively heavy conveyor belt 34 will permit the
be provided to keep the chain drive 25 taut.
drive chain 25 to rotate the wheel assembly on
v Between the side wall discs I1 and I8 there the shafts I0 and -I I unless means are provided
may be mounted a plurality of pockets or tum
to stop its rotation.
bling barrels each of which may comprise a pair
If desired the stop pin 44 which is manually
of spaced barrel head members 30 and 3I rotat
operated may be dispensed with and other means
ably mounted in `journals 32 and 33 in the wheel provided for the rotation step by step of the
side walls I1 and I8 respectively. 'I'hus each wheel assembly. An annular gear 41, which may
pair of barrel heads rotate on a common axis. be made of segments, may be fixed to the periph
Eight of such pairs of barrel heads are shown ery of the side wall disc I 8. This gear may en
although a greater or less number may be de
gage a pinion 48 fixed to a shaft 49 driven by a
sirable in particular cases. It will> be apparent motor 58 connected with a suitable drive 5I. An
from the drawings that the axes of rotation of electrical relay and timer (known in the art) foi`
the respective pairs of barrel heads are equi
stop, pause and start operation may be connected
distant radially from the axis of rotation of the with the motor 50 and suitable contacts corre
wheel assembly (designated generally by the ref
erence character 28) and they are also equally
spaced apart.
To form the side walls of the respective tum
55 bling barrels of which the pairs of barrel heads
30 and 3| constitute the end walls, a single con
tinuous link belt 34 may be trained over the
sprockets 23 and 24, and the rotatable barrel
heads 30 and 3I. Each barrel head may have
60 an annular offset flange 35 on its periphery and
each barrel head may have a liner plate 36 re
movably secured thereto, the liner plate '38 with
the offset flange 35 forming a circular groove 31
to accommodate flanges on the link belt 34 to
65 guide the link belt and to provide for rotation
of the barrel heads when the conveyor belt is
moved linearly; that is, in a direction over the
sprockets 23 and 24 and the barrel heads 38 and
3|. Arcuate tracks 99 and 99 may be fixed on
70 the side wall discs I1 and I8 to assist in guiding
the conveyor belt 34 and to hold the slack. Seal
plates 39 and 40 may be provided on the periph
ery of the wheel as a partial protection to the
sprockets 23 and 24 and the conveyor belt chain
'
75 drives 4I and 42.
sponding to lugs 43.
30
35
40
45
50
Abrasive projecting mechanism such'as one or
more centrifugal abrasive throwing wheels 52 and
53 may be mounted in the roof 54 of the housing
or casing 48m such manner as to project abra
sive at blast cleaning velocities into the casing 55
and in the path of travel of the tumbling mills or
pockets of the wheel assembly. It is preferable
to project the abrasive in a downward direction
into the tumbling barrels (as shown generally in
Fig. 2) for cleaning articles which may be more
conveniently tumbled when the curvilinear por
tions of the segments making up the side walls of
the tumbling barrels form the necessary holding
pockets. It will be apparent that articles such as
castings and forgings in the uppermost barrels 65
will be tumbled when the conveyor belt 34 is
caused to move linearly, particularly when the
wheel assembly 28 is not in rotating motion.
The stationary hollow shafts I0 and II support
a suitable pan or trough I5 which catches the 70
major portion of abrasive projected into the
uppermost tumbling barrels since the link belt 84
provides ample slots or spaces to permit the used
abrasive to fall through into the central trough 75
i mismas n
I6. A screw conveyor I4 mounted to rotate In
the hollow shafts I0 and II carry used abrasive
into >the elevator shaft 66 through which it may
-
3
,
veyor belt 34. While the cleaned castings are
thus being discharged, uncleaned castings may
be charged into >a barrel opposite’they charging
‘ be elevated to the’ feed hopper I6 through another , door 68', and simultaneously the castings in the \
conveyor >90 and> again passed to the abrasive _ barrels beneath the throwing'wheels are being
cleaned. The operation may be carried on con
projecting mechanism. '
„
In addition to the central abrasive trough I5 tinuously step by step without the necessity of
another abrasive collecting trough 51 may be stopping the flow of’projected abrasive which is
provided in the lower portion o_f the casing 46.
returned and recycled through the throwing
This trough may likewise be provided with a
screw conveyor 58 to carry abrasive, projected
wheels.
into the casing and not caught by the central
trough I5, into the elevator shaft 56. The two
screw conveyors I4 and 58 may be driven by a
15 motor 59 suitably connected by drive chains 60
and 6I over sprockets 62, 63 and 64.
,
’
Radially disposed baiiies> 65 may be mounted
between the side wall discs I1 and I8 to direct
abrasive into the trough I5. Additional bañies 66
and 61 may be fixed to the casing walls to avoid
undesirable splattering of the abrasive towardV
the charging and discharging doors described
, hereafter.
The-casing 46 may be provided witha lift type
charging door 68 positioned in the side wall 69 of
the casing. A charging platform 10 may be ñxed
to the casing.- It facilitates charging articles to
be cleaned into the tumbling barrel opposite the
charging door 68.
»
l
A. discharge opening 1I having a discharge
chute 'I2 may be provided in the opposite side
Wall 13 of the casing. Itv will be apparent that
articles in the tumbling barrel opposite this dis
charge opening will be carried out of the barrel
35 into the chute when the conveyor belt 34 is caused
tov move linearly in the direction of the arrow 'I4\.
30
Operation
40
45
50
55
10
~
Thus, a continuously operating tumbling mill»
may be provided which will effect great _savings
in time incident to cleaning as compared with a
cleaning apparatus wherein a single barrel only
is used, there being, according to the invention, no 15
necessity for the throwing wheels to remain idle
at any time during the operation of the con-y
tinuous mill.
,
While certain novel features of the invention
`have been disclosed and are pointed'out in the 20
annexed claims, it will be understood that var'i
ous omissions, substitutions _and lchanges may be
made by those skilled inthe art Without depart
ing from the spirit of the invention.
What is claimed is:
v
,
.
-
25
,
l. In apparatus of the character described, a
conveyor `supporting wheel mounted to rotate
about an axis, means mounted on said wheel to
train a conveyor belt, a conveyor. belt trained by
the aforesaid means to form a plurality of tum 30
bling barrelsfdisposed about the axis of rotation
of said wheel, means to move said conveyor belt
along the path of travel provided by said train
ing means, and means to rotate said wheel about
its axis of rotation whereby to revolve said bar 35
rels in an orbit about saidv axis of rotation.
2. In apparatus of the character described, a
conveyor. supporting wheel comprising spaced
The tumbling mill may be operated as follows:
The wheel assembly may be adjusted to take
apart side frames mounted to rotate about a
common axis, means including discs spaced apart 40
the position shown generally in Fig. 2. The mounted on said sidewalls to train a conveyor,
abrasiveconveyors I4, 58 and 90 together with a continuous conveyor trained by said means to
the necessary elevator in shaft 56 are placed in 'form a plurality of tumbling barrels revoluble in
an orbit about vthe axis of rotation of said wheel,
operation. The tumbling barrel opposite charg
ing door 68 is charged with a suitable quantity of means mounted on said wheel to move said> con -45
veyor along the pathl of. travel provided by said
articles, such as smallcastings |00. The con
veyor belt 34’ is placed in operation. The wheel training means, and means to rotate said Wheel
assembly may then be caused to rotate a step in whereby to revolve said barrels in said orbit about
the.v direction of the arrow 29a so as to bring the the axis of rotation of said wheel.
3. In apparatus of the character described, a 50
charged barrel under the centrifugal abrasive
throwing wheel 52 which is placed in operation. stationary casing, a. conveyor supporting wheel
The next successive barrel is charged through the comprising side walls spaced "apart in parallel
charging door while the articles |00 are being relation mounted to rotate within said casing
subjected to the projected abrasive. The wheel about a> common axis, means including discs`
assembly is then caused to rotate another step spaced apart in parallel relation and rotatable 55
thus to bring the first charged barrel under the about another axis of rotation to train a conveyor,
abrasive throwing'wheel 53 which is placed in a continuous link conveyor trained in part by
operation.
While the castings in the barrels beneath the
throwing
wheels are being tumbled by reason of
,60
the linear movement of the conveyor belt 34 and
simultaneously subjected to the projected abra
sive, the next successive barrelis being charged
through the charging door 68.
After the articles are given the requisite clean
65
_ ing by the abrasive projected by the throwing
wheels, the conveyor supporting wheel assembly
said rotatable discs to form a plurality of tum
bling barrels revoluble about the axis of rotation
of said wheel, means mounted on said wheel to 60
move said conveyor linearly along the path of
travel provided by said training means, and
means to rotate said wheel step by step to revolve
said Ábarrels intermittently in an orbit about the
axis or"V rotation of said wheel.
- '
4. In apparatus of the character described, a
conveyor, means for training said conveyor to
is caused to move another step, thus bringing a
form.-a plurality of tumbling pockets, projecting
barrel containing cleaned castings opposite the
mechanism to discharge abrasive atblasting ve
locities, means for moving said pockets into and
out of the path of abrasive discharged from said
projecting mechanism, and means to move said
conveyor to tumble articles within said pockets
70 " discharge chute 'I2 and at the same time an
empty barrel opposite the charging port 68.
It will be observed that the barrel opposite the
discharge chute takes a position which is analo
gous to tipping the barreland the cleaned articles
75 are carried out by the linearly travelling con
.when in the path of abrasive discharged at blast-ling velocity from said projecting mechanism.
75
i.
4
2,181,789
5. In apparatus of the character described, a
conveyor belt, means including rotatable barrel
heads for training said conveyor to form a plu
rality of tumbling barrels, projecting mechanism
to discharge abrasive at blasting velocities, means
for moving said barrels in an orbit into and out
of the path of abrasive discharged from said pro
jecting mechanism, and means to move said con
veyor belt to tumble articles within said barrels
10. when in the path of abrasive discharged at blast
ing velocity from said projecting mechanism.
6. In apparatus of the‘character described, a
link belt movable linearly, means including rotat
able barrel heads mounted on a. rotatable frame
15 for training said conveyor to form a plurality of
tumbling barrels on said rotatable frame, means
for moving said barrels in an orbit about the
axis of rotation of said frame, and means to
move said belt linearly to tumble articles within
20 said barrels when'in the path of abrasive dis
charged at blasting velocity on to said articles.
7. In apparatus of the character described, a
conveyor, means for training said conveyor to
form a plurality of tumbling pockets, projecting
25 mechanism comprising a centrifugal blasting
wheel to discharge abrasive at blasting velocities,
means for moving said pockets into and out of
the path of abrasive discharged from said blast
ing-wheel, means to move said conveyor to tumble
30 articles within said pockets when in the path of
abrasivedischarged at blasting velocity from said
blasting wheel, and means to return used abrasive
to said blasting wheel.
8. In a tumbling mill, a’frame rotatable on an
axis, -a plurality of receptacles mounted on said
frame revoluble in an arc about the axis of rota
tion of said frame, each of said receptacles in
cluding a belt movable in a curvilinear direction
to tumble articles therein, ‘mechanism for pro
40 jecting abrasive at blasting velocity, means for
moving said receptacles in said arc into and out
of the path of abrasive projected at blasting
velocity from said mechanism, and means to
move said ‘belt to tumble articles within a re
ceptacle when it is in the path of projected
abrasive.
relation and mounted to rotate on hollow shafts
having a common axis of rotation, a plurality
fof tumbling barrels mounted between said side
wall members, said tumbling barrels being mov
able with said side wall members to revolve said
barrels in an arc about the axis of rotation of
said shafts, an abrasive moving member mounted
within said hollow shafts to carry abrasive from
said casing,and asecond abrasive moving member
positioned in the lower portion of said casing to 10
carry abrasive therefrom.
12. A tumbling mill comprising, a casing, a
barrel supporting wheel within said casing having
side wall discs spaced apart in parallel spaced
relation and mounted to rotate on hollow shafts 15
having a common axis of rotation, a plurality of
tumbling barrels having rotatable> end members
mounted between said side wall discs, said tum
bling barrels being movable with said side wall
discs to revolve said barrels in an arc about the 20
axis of rotation of said shafts, and a screw con
veyor mounted within said hollow shafts to carry
abrasive from said casing.
'
13. A tumbling mill comprising, a casing, a
barrel supporting'wheel within said casing having 25
side wall members spaced apart in parallel spaced
relation and mounted to rotate on hollow shafts
having a common axis of rotation, a plurality
of tumbling barrels each having rotatable heads
and' a curvilinear sidewall which constitutes a 30
part of a continuous belt mounted vbetween said
side wall members, said tumbling barrels being
movable with said side wall members to revolve
said barrels in an arc about the axis of rotation
of said shafts,l a screw conveyor mounted within
said hollow shafts to vcarry abrasive from said
casing, and a second screw conveyor positioned
in the lower portion of said casing to carry
abrasive therefrom.
`
»
'
14. A tumbling mill which comprises, a casing, 40
means to project abrasive at blasting velocity into
said casing, two side wall discs in parallel spaced
relation mounted to form a wheel within said
casing rotatable on a common axis, a hollow shaft
to carry said wheel, a plurality of pairs of barrel 45
head members mounted between said side wall
9. Apparatus for blast cleaning metallic ar- ' discs, each pair of barrel head members being
>ticles including, a frame rotatable on an axis, a rotatable on a common axis through their cen
plurality of tumbling barrels mounted on said ters, a screw conveyor operable within said hol
frame revoluble in an arc about the axis of rota
low shaft to. remove abrasive from said casing,
tion of said frame, each of said barrels including rotatable shafts carrying sprockets connecting 50
rotatable barrel heads and a b'elt movable in a said side wall discs, a conveyor belt trained over
curvilinear direction about the periphery’of said said sprockets and rotatable barrel head mem
barrelheads to tumble articles'therein, mecha
bers to form a plurality of tumbling- barrels
nism for projecting abrasive at blasting velocity, equally spaced apart and revoluble in an orbit .
means for moving said barrels in said arc into'and about the axis of rotation of said wheel, means
out of the path of abrasive projected 'at blasting to rotate said sprockets .thereby to cause said
velocity from said mechanism, and means to move conveyor belt to move linearly, and means in
said belt linearly when a receptacle is in the path .cluding a segment gear to rotate said wheel step
oi projected abrasive.
‘
-
10. A tumbling mill comprising, a casing, a
frame within said casing rotatable on an axis, a
plurality of tumbling barrels mounted'on said
es
frame revoluble in an orbit about the axis'of ro
tation of said frame, each of said barrels includ
ing a pair of rotatable barrel heads and a movable
belt trained over said barrel heads,y means for
moving said barrels step by step in said orbit to .
by step about said hollow shaft to bring each
barrel successively into the path of projected
abrasive.
'
~
(il)
'
15. A tumbling mill which comprises, means to
projectv abrasive at blasting velocity, two side
wall discs in parallel spaced relation mounted to 65
form a wheel rotatable on a common axis, a plu
rality of pairs of vbarrel head members mounted
between said side wall discs, each pair of barrel
bring each barrel successively into abrasive clean
head members being rotatable on a common axis
70 ing position, and means to move said belt linearly y through their centers, the axis of rotation of each
whereby to cause articles in said barrel to be pair of barrel head members being the same dis 70
tumbled when in said blast cleaning position.
1l. A tumbling mill comprising, a casing, a bar
rel supporting Wheel within said casing having
side wall members spaced apart in parallel spaced
tance radiallyv from the axis of rotation of said
wheel and equidistant from each other, anv
arcuate guide track mounted on said discs ad
jacent each of said barrel head members, ro 75
n.
.
2,181,732
tatabie shafts carrying sprockets connecting said
side wall discs, a continuous conveyor belt trained
over said sprockets and rotatable barrel head
members and riding on said tracks thereby to
form a plurality of tumbling barrels equally
spaced apart and revoluble in an orbit about the
'axis oi! rotation of said wheel, means to rotate
' said sprockets thereby to cause said conveyor
belt to move linearly, means to rotate said wheel
step by step to bring each barrel successively
into the path of projected abrasive, and means
for returning projected abrasive to said abrasive
projecting means.
16. A tumbling mill which comprises, means to
15 project abrasive at blasting velocity, two side wall
5.
each pair of barrel head members being the same
distance radially from the axis of rotation Aoi?
rsaid wheel and equidistant from -each other, an
arcuate guide track mounted on said discs ad
jacent each of said barrel head members, a screw
conveyor operable within said hollow shafts to
carry abrasive therefrom, rotatable shafts carry
ing sprockets connecting said side wall discs, a
conveyor belt trained-over said ysprockets and
rotatable barrel head members and riding on said 10
tracks thereby to form a plurality of tumbling
barrels equally spaced apart andvrevoluble in an
orbitabout the axis of rotation of said wheel,
means to rotate said sprockets thereby’to cause
said conveyor belt to move linearly, means to 15
a wheel rotatable on hollow shafts, a plurality of
rotate said wheel step by step to bring each barrel
successively into the path of projected abrasive,
pairs of barrel head members mounted between
said side wall discs, each pair of barrel head
jectcd abrasive to said abrasive projecting means.
discs >in parallel spaced relation 'mounted to form
and a second screw conveyor for returning pro
20
members being rotatable on a common axis
through their centers, the axis of rotation oi’
CHARLES H. HAMMELL.
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