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Патент USA US3041796

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July 3, 1962
3,041,186“
A. SCHNETZER
BARREL JET CLEANING MACHINE
Filed March 14, 1960
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INVENTOR.
Alfriléd. Schnetzer
July 3, 1962
A. SCHNETZER
3,041,786
BARREL JET CLEANING MACHINE
Filed March 14, 1960
4 Sheets-Sheet 2
_
INVENTOR.
Alfred Schne’rzer
awhadéaw
14-1-7718.
July 3, 1962
.
A. SCHNETZER
3,041,786
BARREL JET CLEANING MACHINE
Filed March 14, 1960
4 Sheets-Sheet 3
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INVENTOR.
Alfred Schnetzer
@581’, 4HQWA? yaw
July 3, 1962
A. SCHNETZER
3,041,786
BARREL JET CLEANING MACHINE
Filed March 14, 1960
4 Sheets-Sheet 4
Fig.5
INVENTOR.
Alfred Schnetzer
whauyw
United
latent
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3,041,785
Patented July 3, 1962
1
2
3,041,786
Alfred Schnetzer, Schatfhausen, Switzerland
ing 7 formed in the casing 1, as explained in the above re
ferred to Patent No. 2,909,012. Thus it will be appreci
ated that workpieces loaded upon the belt 2 behind the
position of the roller 3v will be thereby subjected to a
blast treatment from the device 7 while being continuously
BARREL JET CLEANING MACHINE
Filed Mar. 14, 1960, Ser. No. 14,903
7 Claims. (Cl. 51—9)
This invention relates to an improved “barrel” type
blast ?nishing machine, of the type employing revolving
tumbled so as to present to the blast stream constantly
changing surface portions of the workpieces. Direction
of rotation of the belt 2 is reversed when it is desired to
unload the treated workpieces, so that the workpieces
2,909,012.
10 will thereupon be ‘discharged over the roller 3- into a suit
Such machines have previously been suitable to handle
able receptacle, as guided for example by an apron as
only certain kinds of workpieces; namely, those which
indicated at 23 (FIG. 1).
do not suffer damage when being carried and tumbled
The casing 1 is provided with an access door as ‘in
about on a feed belt. Fragile and awkwardly shaped
dicated at 81 which in the form of the invention shown
workpieces cannot be satisfactorily processed in such ma 15 in FIGS. 1-3 is provided with vertically aligned bear
chines, and therefore workpieces of this kind are usually
ings 9, 9, adapted to receive a pivot pin portion 10 of a
treated on the so-called “table” blast type machines such
support arm 11 which is ‘dimensioned to reach into the
as employ rotating ‘tables to support and present the work
interior of the casing between the positions of the end
pieces at different angles to the blast jet. Hence, in many
plates 6, 6. The arm 11. terminates therein with a ver
factories two machines of these different types are re 20 tically directed stub axle portion 12 which rotatably sup
quired, ‘and in relatively small factories it usually happens
ports thereon the hub portion 13 of a table device hav
that both such machines cannot be economically exploited.
ing integrally formed therewith a drive wheel 14 and a
The object of the present invention is to provide a
bracket 15 adapted to detachably support a workpiece
single machine of novel form, economically combining
load basket 16. The basket 16 is of open top construc
the features of the “barrel” and “table” type machines. 25 tion and slip-?t mounted within the bracket 15 so as
The invention is characterized in that a blast chamber is
to be readily removable.
provided with an endless barrel type “tumble belt” run
Some suitable arrangement is provided for biasing the
ning under laterally spaced end discs, and a removable
wheel portion 14 of the device to bear in friction-driv
supporting element on which a revolving table and drive
ing relation against one of the end discs 6 so as to derive
means therefor are mounted; the drive means being 30 power therefrom for rotating the workpiece carrying
adapted for driving connection with one of the end discs of
basket 16. As shown in FIGS. 1-3, such an arrangement
the tumble belt mechanism, so that, as a result of this
may comprise a bracket 17 extending from the door 8,
connection, a rotary motion is transmitted to the table.
and a tension spring 19 extending therefrom into con
feed belts disclosed for example in U.S.A. Patent No.
In the accompanying drawing:
nection with a bracket 18 attached to the support arm
_ FIG. 1 is a vertical section through a machine of the 35 11; the parts being so arranged that the tension of the
invention;
FIG. 2 is a horizontal section taken along the line II—-II
of the machine of FIG. 1;
FIG. 3 is a transverse vertical section taken along line
III-III through the machine of FIG. 1;
FIG. 4 corresponds to FIG. 1, but shows another
method for mounting the table;
FIG. 5 is a sectional view taken along line V—V of
FIG. 4;
spring 19 causes the friction wheel 14 to be constantly
biased into driving bearing relation against one of the
discs 6 (FIG. 2). The mechanism is so arranged that the
friction wheel 14 contacts the end disc 6 at a distance off
set from the center of rotation of the end disc, such as
indicated for example at 20 in FIG. 1. Thus, it will be
appreciated that rotation of the end disc 6 will cause
simultaneous rotation of the workpiece carrying basket
16, whereby workpieces placed in the basket 16 will be
FIG. 6 corresponds to FIGS. 1, 4, but shows still an 45 caused‘ to move about under the blast issuing from the
jet opening 7, so that all surfaces of the workpieces are
FIG. 7 is a sectional view taken along line VI—VI
exposed to the blast action.
of FIG. 6;
A device such as the basket 16 will of course be ad
FIGS. 8, 9, correspond to FIGS. 1, 2, but show use
vantageously used whenever the workpieces are of rela
of an intermediate gear device for driving the table; and
tively small size and otherwise ‘best suited to that type
FIG. 10 is a detailed sectional view, on enlarged scale,
of support; although it will of course be understood that
taken along line X—X of FIG. 9.
other types of workpieces may more advantageously be
As shown in the drawing herewith, a machine may be
treated |by simply mounting them upon a flat rotating
constructed in accord with the invention to include a
table (in lieu of the basket 16) which will ‘be driven by
other method for mounting the table;
casing or cabinet 1 in which is mounted a workpiece sup
porting feed belt 2 which is mounted upon guide rollers
3, 4, 5, and arranged to train beneath a pair of laterally
spaced disc-like side plates 6, 6. Power is supplied to
either of the guide roller or side plate arrangements, to
55 the same arrangement so that the various surfaces of
the workpieces will be thereby presented to the *‘blast
stream as explained hereinabove.
Thus, ‘for example, a
simple table device having a central hub portion adapted
to slip-?t downwardly upon the stub axle 12 may be
cause the feed belt 2 to rotate normally in counter-clock 60 supplied in conjunction with the basket device 15—16
wise direction as viewed in FIG. 1 of the drawing here
as shown herein, for alternative use in connection with
with. Thus, workpieces to be cleaned or otherwise surface
different types of workpieces.
blasted may be loaded into the cradle portion of the feed
It will of course be appreciated that a gear mech~
belt to the left of the roller 3 as viewed in FIG. 1, where
anism may fbe readily employed in conjunction with the
upon the counter-clockwise rotation of the feed belt 65 drive wheel 14 and the workpiece support basket_16, in
will cause the ‘workpieces to be continuously pulled to
order to provide any preferred speed of rotation of the
the left and thence upwardly toward the roller 5 until
basket relative to the speed of rotation of the end plates
such time as the natural angle of repose is exceeded where~
6, 6. Or, in lieu thereof, the distance between the zone
upon the workpieces will tumble forwardly and down
of contact of the driving wheel 14 with the end disc 16
wardly on top of the underlying workpieces.
70 relative to the center of rotation of the end disc may
Throughout the operation the workpieces are subjected
be varied; such as by making the vertical branch por
to blast of abrasive or other media through a jet inlet open
tion of the arm 12 to be extensible-contractible so that
3,041,786,
3
the distance 20 may be adjusted to provide any pre
ferred speed of rotation of the basket. Or, to provide
increased speed of basket rotation, the drive wheel por
tion 14 may be mounted below the horizontal level of
the support arm 11 and in the region of the bottom
peripheral elevation of the end plate 6.
By virtue of the mounting of the workpiece support
table and/ or basket by means of its support arm 11 upon
4
I
FIG. 7. In this case a tension spring or a torsion spring
in connection with the coupling 39 may be employed if
required to bias the driving wheel 14 into bearing con
tact ‘with one of the side plates 6, for the purposes ex~
plained hereinabove.
FIGS. 8, 9, 10, of the drawing herewith illustrate still
another embodiment of the workpiece support table driv
ing mechanism, wherein a speed change gear is provided
in combination with the workpiece support table. In this
the door 8, provision is thus made for facilitating load
ing and unloading of the workpiece support device. 10 case a carrier arm 31 is provided to extend rigidly from
the door 8, and the arm 31 mounts a two-armed bell crank
When the door is opened the workpiece sup-port table
32. One arm of the bell crank as indicated at 32a car
or basket is thereby automatically withdrawn into the
ries at its outer end a drive wheel 33, and an endless
open for maximum accessibility incidental to loading
friction cord 34- is trained about the wheel 33 and around
and unloading thereof. However, it ‘will be understood
that in lieu of this arrangement, the support arm might 15 a second wheel 35 which is keyed to the workpiece carry
ing basket 36. The other arm 32b of the bell crank 32 is
be based upon any other portion of the machine cas
biased by means of a tension spring 37 connected to the
ing, such as on one of the side walls thereof, and s0
dimensioned that the workpiece support table may still
support arm 31, and the parts are so arranged that the
be swung out of the casing 1, when the door is open.
tension of the spring 37 operates to bias the drive wheel
It is to be understood of course that the workpiece 20 33 into friction bearing relation against one of the end
support belt 2 may be of any preferred form such as
plates 6 of the machine (FIGS. 9, 10). Thus, rotation
comprised of a series of articulated metal plates, or in
of the side plates 6 frictionally drives the endless cord
the form of an endless rubber belt, or the like. In any
34, which in turn causes the basket 36 to rotate; the
case the belt will preferably be of perforate form so as
speed of rotation of the basket depending upon the ratio
to provide su?icient openings to permit the spent blast 25 between the distance between the position of driving con
media to fall therethrough after it has operated upon
tact and the center of rotation of the side plate 6, and
the workpieces supported ‘by the belt. Also, it is to
the diameter of the wheel 35. By virtue of such an
be understood that whereas in FIGS. 1-3 the work
arrangement, the basket 16 may be driven to rotate at a
piece support table is illustrated to be arranged for ro
speed considerably faster than in connection with the form
tation about a vertical axis, the device may be readily
of the invention previously illustrated and described.
modi?ed so as to incline the axis of table rotation away
from the vertical so as to give the workpieces any pre
ferred tumbling action and attitude towards the direction
of blast media projection.
For example, the support arm
It is of course to be understood that whereas the work
piece support table is illustrated and described above as
being in all cases driven by frictional contact with one
of the side plates 6, the table may be driven by some other
pivot pin 10 may be carried by bearing devices arranged 35 suitable rotating or revolving element of the barrel blast
so as to incline the pin away from the vertical, while
ing machine; such as forv example by hearing contact
still being parallel to the door 8; the workpiece support
against the feed belt 2. In any case, it will be appreciated
table and basket 16 being correspondingly inclined away
that it is a particular feature of the present invention
from the vertical. In such case, the support arm and
that a single machine is thereby provided whichis readily
‘basket assembly will automatically tend, in response to 40 convertible for use either as a barrel blast type machine
the forces of gravity, to “slide down hill” until the rim
or as a table blast type machine; the conversion thereof
of the guide wheel 14 rests in friction bearing relation
being quickly effected with utmost facility so that the
against the end plate 6, thereby eliminating need for any
single machine will readily serve the purposes of two
tension spring such as indicated at 19 in the drawing
herewith.
45
FIGS. 4, 5, illustrate another arrangement for mount
ing the workpiece support table~basket. In this case the
support arm 27 is formed to include a vertical portion
different type machines such as have been heretofore
required.
What is claimed is:
1. In combination with a tumbling machine including
a casing, horizontally disposed roller means journalled in
terminating in a horizontally bent end portion 2711 which
is journal'led in a bearing block 28 suspended from the 50 said casing, a pair of laterally spaced disc-like side plates
journalled in said casing, endless conveyor means trained
roof of the casing. A locking pin 38 is slip-?tted through
an aperture formed in the end of the support arm por
tion 271: for quick detachable mounting and dismount
over said roller means and beneath said side plates to
provide a workpiece tumbling pocket, means for rotating
ing of the support arm and the basket, as may be de
said roller means and said side plates and effecting move
the support arm 30 includes a vertical extension 30b
away from said one side plate, and said means comprising
sired. Thus, the machine may be readily converted for 55 ment of said conveyor means, and a blast media pro
jection device mounted on said casing above said con
use either as a barrel blast machine or as a table blast
veyor means for directing blasting media downwardly
machine. A tension spring as indicated at 29 may be
into said pocket; a support member detachably mounted
employed to bias the support arm and the driving wheel
on said casing, a horizontally disposed workpiece support
14 against one of the end plates of the machine for
driving rotation of the workpiece carrying basket, as 60 member journalled on said support member for rotation
about a generally upright axis at a position beneath said
explained hereinabove. Or, in the alternative, the bear
blast media projection device, and means for rotating
ing ‘block 23 may be so arranged that the weight of the
said workpiece support member including a driven mem
support arm and of the workpiece support mechanism
ber movable into and out of driven engagement with one
and of the workpieces therein ‘will operate automatically
of said side plates.
to bias the driving wheel 14 into bearing contact against
2. The assembly as de?ned in claim 1 wherein said
one of the side plates of the machine.
support member is pivotally mounted on said casing for
rFIGS. 6, 7, illustrate still another form of mounting
swinging said workpiece support member toward and
for the workpiece support table-basket device, wherein
which is journalled in a rotatable coupling 39 suspended 70 a drive wheel rigid with said support. member and being
from a ?xed arm 30a which is ?xedly mounted in the
larger than such support member to engage said one side
roof ‘of the casing. Thus, when the door 8 is open,
the support arm 30 may be swung from the operative
position shown in FIG. 7 outwardly to the loading-un
loading position thereof as shown in broken lines in
plate.
3. The assembly as de?ned in claim 2 wherein said
casing is provided with an access door, said support mem
her being pivotally mounted on said access door, and
5
3,041,786
spring means biasing said support member to engage said
6. The assembly as de?ned in claim 4 wherein the last
means comprises a drive wheel supporting said support
drive wheel with said one side plate when the access
door is closed.
4. In combination with a tumbling machine including
a casing, horizontally disposed roller means journalled in
said casing, a pair of laterally spaced disc-like side plates
journalled in said casing, endless conveyor means trained
member, said drive wheel being larger than said support
member and engaged with one of said side plates.
7. The assembly as de?ned in claim 4 wherein the last
means includes a driven wheel connected to said support
arm and positioned beyond said support member, and
over said roller means and beneath said side plates to
an endless belt trained over said driven wheel and driv
provide a workpiece tumbling pocket, means for rotating
said roller means and said side plates and effecting move
ment of said conveyor means, and a blast media pro
jection device mounted on said casing above said con
10 ingly connected to said support member, said driven wheel
veyor means for directing blasting media downwardly
into said pocket; workpiece supporting means including a
substantially horizontal workpiece support member for 15
selective disposition beneath said blasting media device,
a support arm connected to said casing and rotatably re
ceiving said support member for rotation about a gener
ally vertical axis, and means for rotating said support
being positioned to engage said belt against one of said
side plates.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,882,4412
2,429,742
Peik ________________ __ Oct. 11, 1932
Barnes ______________ __ Oct. 28, 1947
580,226
Great Britain ________ __ Aug. 30, 1946
member.
5. The assembly as de?ned in claim 4 wherein the last
means engages one of said plates.
FOREIGN PATENTS
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