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Патент USA US2131767

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Oct. 4, 193.18.
D. C. TURNBULL
APPARATUS FOR TREATING METAL
Filed July '1, -1936
L 2,131,761 `_ '
4 Sheets-Sheet’ l
i«Oct` 4, 1938..
v
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i
n, c. TURNBULL
=
2,131,767
APPARATUS V>FOR TREATING' METAL
' 4Filed July 1, 195e
4 sheets-sheet 2
ATTORNEY
I
Oct. 4, 1938. , .
2,131,767
D. c. TURNBULL
.APPARATUSJv Fon' TREATING METAL
Filed July 1~, 195e
` 4 sheets-sheet s
hm.
`. lNvENToR
,Band Ú.' Zim/z Zul/ZZ.
BY
Oct. 4, 193&'
D. c. TURNBULL. '
2,131,767
APPARATUS Fon TREATING >METAL,
Filed July l, 1936
4 Sheets-Sheet 4
INVENTOR
G
,Dawd 6. Zur/wall.
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BY-
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~
ATTORNEY
Patented
- 2,131,167
mirri-:b>` STATES. PATENT 'orifice
2,131,161
.
. APWPARATUS FOR TREATING METAL
David c. Tdrnhuu, nnshawm', rnd., assignnr'm ’ _
-American Foundry Equipment Company, Mlah- .
awaka, ind., `a corporation of Delaware
ßApplication .hay` 1, 193s, semi~ Naïsazsz
by treating both upper and lower surfaces‘of the
This invention‘relates-to
_. apparatus'for
' _12 treat->
« ing metal and> more particularly to apparatusl
articles substantially simultaneously. '
_«
y
whereby relatively large. heavy or irregularly
treating the surfaces of castings, Vforgings-.and‘5 similar metallic articles.
.
-The Ypresent invention provides apparatusA `
for cleaning, polishing, hardening or otherwise
' .
shaped articles such as castings, forgings and `s l
_
`In cleaning, polishing, hardening or otherwise yother machineand structural parts of `various
treating 'the surfaces of metallic articles it is de yshapes can be quickly `and- easily cleanedpor"
sirable 'to so manipulate the articles in thestream treated. The apparatus permits the cleaning op
of treating-particles that the articles will be unl ' eration to be carried out continuously and sub- - '
10 formly and satisfactorily cleaned or treated. stantialiy automatically. If desired,_aut0matic 10"
Where the articles are small.- rugged and so apparatus may _be provided forsupplying ~.the
shaped that they can be tumbled about, they can - articles vto the treating apparatus aini'conveyins`
generally be effectively treated in a tumbling
mill. However, where the articles are large, ir
ll regularly shaped, brittle or fragile they cannot
_ them therefrom.,
"me apparatus is simple and rugged VandJis'easyv
toconstruct and operate. There is la.
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"il
` be so cleaned and treated and other methods and -of the apparatus exposed to _the wearing action` . .
apparatus must be employed.
_
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_of the treating material and the‘parts thusy ex-
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An object_of this invention is `to provide an. posed can be quickly__ and easily repaired or re- _
' placed.. The principal bearing portions of the » -
imroved v_apparatus‘ißor uniformly treating or
apparatusall -areïeifectively sealed against entry 1.20
20 cleaning the surfaces 'of irregularly shaped, or
large, brittle'or fragile articles by continuous
operation.
`
of' yabrasive particles and thus are
' and
_
Other objects of this invention will become
apparent from the disclosure.
` __
25 l Accordingtothe present invention, the articles
to be treated are 'deposited on a conveyor and
advanced through the stream of treating mate«l .
rial in such a way that all portions, or predeter
mined selected portions, Vof’feach article are ex- ‘
30 posed for treatment by the stream. Each article
is advanced along a predetermined path through
the stream and is turned about an'axisextending
life'`
of injury.
»Various other features and advantages rof the j "
invention will be apparent from the following‘par- ’
_ticular description andv from an inspection of the 25 ’l
accompanying drawings.
\
_
Although 'the' novel features whichv are believed `
to be characteristic of thisinvention -will be par-_
ticuiarly pointed _out inv the claims appended
hereto', the invention itself. as to its objects and 30 Y _ »
advantages; and the manner in which it may beL ’
carried out. may be'better understood lby refer-,_
l ring to the following description taken in con- j
ment of the article. Preferably the treating’ma- f _nection with vthel accompanying'drawings form- , _
transversely tothe ‘direction of advance move
35 terial is projected against the articles from two
opposite directions in fan-like streams so that
ing a part thereof', in which: ‘
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-Fig. 1 is aside elevational view of onei'o'rm
the treating materialwill strike all selected sur-> oi!> apparatus suitable for carrying- out the in
face portions of the articles including the sur
faces of cavities and projections.
40
'
The apparatus for carrying out the invention
preferably includes a conveyor having a plurality ‘
v vention, certain parts being shown in section ltov
expose the interior _construction- this-view'being
taken along line i-i-I _of Fig. 5;.
" -
Fig. 2> is 'an enlarged transverseA
of spaced and generally parallel 'supporting ele ' tional view taken- along line 2-2 oi’ Fig.' 1; .
ments adapted to support the articles to be treat- «
ed and-fito advance them along a predetermined
45 lineal path and at the same time turn them about
` to expose all surfaces or selected surfaces of the
article to the abrasive stream. 'I'he supporting
_ Fig. 3 is a top plan view of the complete ap-`
Daratus;
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Fig. 4 is a cross sectional view taken along line '45 '_
Hon-"iai:
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_. Fig. 5` is an endjele‘vational view of the appa-i f
elements may comprise belts actuated at diiferent ' ratus viewed from the discharge endthereof; and ~
` Fig. ii is Aa somewhat diagrammatic sectional
relative speeds,« thereby to -eifect a«turning move
5'0 ment of the articles during forward movement
as they are being'treated.- Preferablyltheab
view of a throwing wheel used to'project the 50
abrasive
stream.
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In'the ‘following description and in the claims,
rasive throwing wheels or projectors are arranged
v so that -one or more of them projects a stream of . various -,details will be identified by Specific namesy
treating material from above and one or more for; convenience, but they are ,intendedto be as '
55 projects the treating material'from below,\there- " generic in their'application as the
will per- Q55
_ 2
2,131,707
mit. Like reference characters denote like parts but generally will be selected so that .it ap
in the several figures of the drawings.
Droaches 90°.
i
.
In the drawings accompanying and forming
A suitable opening 24 may be provided in the
part of this specification, certain specific dis
top wall of the housing 2 to permit the passage
closures of the invention are made for purposes
of explanation, but it will be understood that the
details may be modified in v'arious respects with
out departure from the broad aspect of the in
vention.
10
Referring to the drawings, the apparatus in
cludes a housing structure I having _a treating
chamber 2. The housing I is provided with an
inlet or charging opening 3 and an outlet or
discharge opening 4. Adjacent the charging
15 opening 3 is a charging vestibule 5„closed by one
or more iiexible curtains 6. Adjacent the dis
charge opening 4 is also. a discharge vestibule 1,
closed by one or more ñexible curtains 8.
Ex
Disposed below the conveyor 9, and preferably
in substantially the same vertical plane, is a
second abrasive projector 30 which may be simi
lar in all respects to the wheel III Aand may be
rotatably carried on a shaft 3| extending through
an opening 32 in the' housing walland journalled
in bearings 33. 'The wheel 30 may be driven
from a motor 34 in a manner similar to the pro
tending between the charging opening 3 and dis
jector I0. The projector 30‘may be disposed
charge opening 4 is a conveyor 9 (described more
directly below the projector Il or it may be offset
longitudinally as shown in Fig. 1 in the illus
in detail hereinafter), adapted to support articles
to be treated and convey them through the
treating chamber 2.
Suitably mounted on the top wall of the hous
ing I and adapted to project a stream of abra
sive a against articles d on the conveyor 9 is an
abrasiveprojector IIl, which preferably is ofthe
centrifugal throwing wheel type. Although the
abrasive projector may take other suitable forms,
30 preferably it comprises a plurality of spaced
throwing blades 'I2 extending from adjacent the
periphery of the wheel inwardly and- terminating
short of the center of the wheel to. define a
generally central opening I4. The blades may
35 be supported upon a frame such as one or more
side plates II. The hub portion I3 of the wheel
is connected to a rotatable shaft 25 mounted in
Y suitable bearings I5.> Disposed in the circular
space I4 between the inner ends of the blades I2
40 is an impeller I6 having a plurality of radially
extending vanes I 1 which preferably rotates with
the i throwing blades I2. '_An independently
mounted normallystationary control member I8
may be interposed between the impeller I6 and
the inner ends of the blades I2 and maybe pro
vided With a discharge 'opening‘ I9. The treat
ing material is supplied to the impeller I6 by a
feed pipe 20.' The wheel I0 is driven by a motor
22 which is connected as by a belt drive 23-to
the rotatable shaft y25 on which the wheel is
mounted.
When treating material- is supplied to the
rotating impeller {and'wheel it is hurled by the
impellervanes I1 through the opening I9 in the
55 control member 'and into the path of the rotating
throwing blades I2. 'I'he material is'urged out-1
wardly along the blades I2 by centrifugal force'
and is projected from the blades I2 adjacent the
periphery of the wheel by combined centrifugal
60
0f the abrasive a into' the treating chamber.
Preferably a portion of the wheel I0 projects
through this opening and into the treating cham
ber. A suitable protective housing 26 may be
disposed over the wheel to enclose the major
portion thereof.
and rotational force.
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'I'he treating- material is projected from the
trative drawings.
A hopper 35 containing treating material is
disposed in a suitable position preferably above’
the projectors I0 and 30. The hopper is con
nected to a main conduit 3€ leading into branch
conduits 31 and 38, which supply treating mate
rial to the feed pipes 20 leading to the projectors
Ill and 30, respectively. The conduits 31 and 38
and dfeed pipes 29 may be suitably supported by
brackets 2| and 39 connected to the adjacent
structure.
.
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'I‘he treating material used will depend upon
the work to be performed. vIt is understood that
the terms “treating metal” or ‘fabrasive" is in
tended to refer to any suitable granular material
ranging from relatively large to relatively small
particles and from smooth non-cutting particles
such as hard=steel shot, to highly abrasive par
ticles such as cracked steel grits or sharp quartz
sand. Where a relatively smooth surface is de
sired the particles may be line and relatively
smooth and non-abrasive, andwhere a rough
ened or stippled surface is desired, particles hav
ing abrading characteristics are selected.
The bottom wall of the housing is inclined to
provide al hopper 45, whichA may be disposed if
desired in a pit 46 below the surface of the
door. The hopper 45 leads to and communicates
with an open trough 41 provided with _a screw 50
conveyor 48, adapted to conduct spent abrasive
toward the center-of the trough 41. Communi
cating with the trough 41 and leading to an
elevator 50 is a second trough 49 having a screw
conveyor 5I. The elevator- 50 may include an 55
endless belt 52 trained over drums 54 and 55 and
carrying a plurality of buckets 53. The con
veyor 48 is driven from a motorand reducer set
60 connected as by the belt drive 62 to a pulley
63 attached to the conveyor 48. 'I'he conveyor 5I 50
may be driven in a similar way from the motor
wheel in the form of a fan-like stream which ‘ and reducer set 60' through a belt drive 65, and
diverges from its point of emergence and irn
a pulley 61. The conveyors cooperate to carry
pinges the~articles in the form of an elongated the spent abrasive from the hoper 45 to the
impingement pattern. The direction of flight elevator 50. The- elevator 50 is driven by a motor 65
of the stream a relative to the wheel can be
10 driving a speed reducer 1I which in turn drives
regulated and determined by a proper adjust
a suitable belt drive 12 which rotates the upper
ment of the clock dial’position of the opening I9. drum 55. The abrasive is elevated from the bot
The wheel is preferably arranged- so that the tom of the elevator 50 to the top thereof and dis
70 articles carried by the conveyor 9 pass through charged into the hopper 35 from whence it can 70
the stream a in a direction extending substan
flow by gravity to the projectors I0 and 30.
tially along the longer axis of the _impingement
The conveyor 9 may include a pair of spaced
pattern and are struck by treating particles from and generally parallel endless flexible belts 89,
angles varying throughout sixty degrees or more. each of which is trained around drums 8| dis
75 The range of angularity may vary considerably posed outside the front and rear end walls of
75
3
'2,131,707
plied with abrasive from the hopper .99 in the
the housing l. vlinen-«imm siqismoimted on
shaft 92 rotatable in‘bearin'gs 99can'ied on a 4manner above described and> project abrasive
streams a and b respectively, into the treating
2. Each' belt 99. is adaptedto ride on a belt guide , Chamber. l The'articles d to be treated are suc
s or support 99, mounted on brackets 9| which are cessively placed upon the loading chute |95 and ß '
suitably secured tothe housing I. Each support slide by gravity or are otherwise urged on to the
‘ -99 has a ñat vweb portion.” preferably inclined 'belts 99, each of which supports an edge por
"bracket- or shelf 94 extending from .the housing
downwardly and inwardly and an upstanding tion of the rim w. The motors |994 are energized
and drive 'the belts 99, thereby advancing the
guide i‘iange 99 at its _outer edge and a depend
10 `ing stiiîening flange 9| at«its inner edge. The drums d through the 'charging 4vestibule and _into 10
. '
supports 99 are suitably spacedand constitute the treating chamber. _
The articles d advance forwardly ,within-the
with the belts 99 means .for supporting and ad
_vancing articles d to be treated through the =_chamber and enter- the abrasive stream a which
impinges against the top surface of the rinrw
treating chamber.A
.
_
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1_5 ' The lower night of each belt 99' may be trained > and the leading surface of thev hub h.¿ Prefer- 15
over one or more rollers 95' rotatably mountedvr ably the belts 99 are driven at different speeds,by shafts 99 suitably journalled in the housing I. thus effecting rotation of each article d about
its vertical axis. This rotation brings successive
It will be seen that the upper flight of each con
tinuous belt 99- enters the housing | through the . portions of the horizontal top »surfaces and the
vertical surfaces into the stream a, where they $0
are‘suitably treated. Aseach article d advances `
through the stream, it is struck by abrasive 'ap
proaching from angles which vary as the articles'
29 charging opening 9, >movesthrougii the treating
_ chamber Zand leaves Vthe housing through the
discharge Iopening 4. Suitable lower openings
(not shown) are provided in the e‘nd walls of
advance. Thus, the surfaces of the cavities and .
the housing i f_or 4permitting thepassage of the
projections are effectively subjected to the effect 25
25 lower ilight. A iiexible curtain or brush 91 may
be provided adjacent the last supporting'roll '.95 '
ofthe stream.
and similar brushes 99 may be disposed adja
As the article d is advanced further,_it leaves
the stream‘ a and enters 'the stream b, which
. >cent the belt opening in the housing for remov
_
ing spent abrasive from each belt 99 before it .treats the lower surfaces of each article d in a
_
Ímanner equivalent to the treatment of the upper 90'
surfaces by the stream a. Each article then
99 passes from the- treating chamber 2. _
Preferably, eachlbelt 99_ is driven by a motor
|99, driving a speed reducer |9|, which is .con
nected ‘as by a chain drive |92, to a sprocket |93carried on the drum shaft 92‘at one end of the
passes out through the discharge vestibule 1 ,and
is- deposited on the discharge' chute |91 by `which
it -can be -transportedaway from the treating
apparatus.
35 apparatus. Energization of the motor |99'eilects _
rotation of the corresponding drum 9| _ and
_
as,
> It will be noted from an inspection of the draw
ings that articles having a diameterA consider
be1ts99 may be driven from a single sourcel of ably greater-than the width of ‘the abrasive
power but it is desirable that the speed of each . streams aand b may be effectively cleaned by _
- the apparatus -disclosed due to the fact that the '40
40 belt 99 be individually controllable.`
i v
Preferably, the belts laredriven at different' articles dfare rotated about an axis lying ina
vertical plane passing substantially midway'be- _
forward speeds so ,that the articles carried there
-causes the belt 99 to-travel along its path. The
tween the -supporting elements and approxi
l 'on are caused to rollïorrotate.. If desired, one
mately medially of the streams a and b. Thus, -
of the belts may be driven in a reverse- direction
_the articles d are continuously 4in the streams ¿i5
and the several portions are carried through each
45 but in this event,- the other b_elt should have a
' forward speed in excess of the rearward speed of
the iirst belt.
_
« `stream preferably'a number of times during the
’
If desired, suitable charging vand discharging
_ ` `apparatus may be provided adjacent the charg
5” ing and discharging ends, of the apparatus, re
spectively. The articlesto be treated may be
course of a single trip through the apparatus.
The speed of the articles ‘d through the treating
.
chamber is controlled so that the articles` are ex- 50
posed to the abrasive for the 'desired time and.
the relative speeds of the belts 99 are adjusted
from automatically if _ desired. However, the so' that' thearticles rotate the desired numberr
transported'to the conveyor and removed there
specific structure of such ’automatic conveyors
` 55 forms no part of the present invention and any
of times in passing through the treating chamber.
-. The provision _of the required number' of pro- 55
suitable automatic conveyor may be employed. vjectors both above and below the conveyor so >
Forfthe purposes of illustration, _there is shown arranged as to treat both» theupper and l°ower ’
a loading chute |95 supported by bracket |99, vsurfaces of articles‘on the conveyor ~permits. the
which chute is inclined toward and extends to
so the loading end of the upper flight of the belts
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‘
99.
A discharge chute |91 may extend from the l
~ discharge end of the upper flight and may be
suitably supported by bracket |99.
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The present apparatus is- suitable for treating
65 various shapes and sizes of articles and is ad
mirably adapted »for treating articles having a
articles to be fully treated in the course of a singleA
trip through the apparatus. “It is innemend~ that 00
any `number of -wheels Yorprojectors' placedV in
staggered relationship or otherwise arranged may
be used as conditions require. The articles to be
treated may be supplied atzone -end of the appa
ratus and removed at theother,- and the appa
ratus operated continuously so Íthe apparatus
substantially circular or cylindrical body portion _ - need be shut down only for repairs.
as, for example, wheels, brake drums, receptacles
Preferably the belts 99 `are so arranged that
and various other articles., For` the purpose of the rim portions of the articles'only bear on the
70 illustratiom'there isfshown a plurality _of‘brake belts. thus permitting lthe articles yto roll rela- _
drums,d each `-olf which has a cylindrical rim . tively freely on the belts. ~This 'insures a rela
portion w and a projecting hubh.
_» -. .
` The operation of the apparatus is as follows: tively smooth, _even rotation ofthe articles on_
The abrasive projectors I9 and 39 are driven by ,. the conveyor. Also, the inclination of the belts -
75 the motors 32 audit, respectively, and are sup
Í99 causes the articlœ to-assume a_ central posi- _75
4
2,131,7o7
tion relative to the conveyor and thus uniform
treatment of the articles is insured.
ferential speeds so as to cause the articles sup- ~
In certain cases, one of the belts may be omit
ted and the remaining belt driven in the manner
above described. In that case, the single belt im
parts a rotary movement to each article and
causes the article to roll along while supported by
the support 90 at one side and the belt 80 at
the stream, and means for supporting the upper
the other side.
10
A
It will >be noted that substantially no portion
of the apparatus is directly in the path of the
abrasive ñred by the vthrowing wheels, the articles
'd to be cleaned being juxtaposed as shown in Fig.
ported thereon to rotate while advancing through
run of said belts transversely inclined toward one
another.
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3. Apparatus for blast cleaning metal articles
including, a housing, an abrasive ~throwing wheelv
operative to project a controlled fan-shaped
.stream of abrasive into said housing, and con
veyor means extending through said housing and
adapted to advance articles to be treated through
said stream, said conveyor means- including a
pair of spaced and generally parallel supporting
1 to receive the full force of the abrasive ñred
elements, endless belts having portions riding on
15 >by the wheels. The flexible curtains 5 and 8 said supporting elements, drums disposed out
bear upon the belts'80 and prevent the escape of side of said housing and having driving engage
spent abrasive and the. brushes 91 and 98 brush ment with said endless belts, and means for driv
the abrasive off from the conveyor. Substan
ing said drums to selectively advance said end
tìally all of the bearing portions of the appa . less belts at desired differential speeds.
ratus are disposed outside of the housing and
4. Apparatus for treating metal articles in
thus there is little opportunity for abrasive work
cluding, a housing, a plurality of spaced and gen
ing into the bearings. In this connection, it will erally parallel endless belts extending through
be noted that the supporting rolls 95 for the belts said housing, a driving drum for each of said
_preferably are spaced sufliciently to permit the 'endless belts disposed outside of said housing,
abrasive streams to pass therebetween. 'I'he sup
means for driving said belts at diiîerential 25
ports 90 preferably are also spaced sufûciently speeds, guide members extending through said
to be out of the path of the abrasive.
Íhousing’and adapted to support and guide the
The apparatus may be suitably modiñed to upper flights `of said endless belts, spaced sup
handle various types of articles, and thus it is porting and guiding rolls adapted to support the
apparent that various modifications may be made lower flights of said endless belts, an abrasive 30
in the apparatus without departing from the throwing wheel operative to project a fan-shaped
spirit of the invention. Preferably, the supports streamof abrasive having an~ elongated impinge
90 and belts 80 are of suiiicient width to accom
ment pattern, said wheel being arranged iso as
modate a considerable range of sizes of articles. to place said elongated pattern between said
'I'he belts may be made of various materials hav
spaced belts, and sealinggmeans for the upper 35
ing suitable strength and wearing qualities and of and lower'ñights of said belts respectively for`
suil‘lcient flexibility to assume the shape required preventing the escape of treating material from
to properly support and manipulate the articles said housing.
.
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supported thereon. The belts may be formed of
5. Apparatus for blast cleaning and removing
rubber, fabric, connected metal bars, intercon
nected links or various other suitable materials.
The apparatus is adapted to convey articles
-of various shapes and sizes and the articles may
be positioned so that they are substantially sup
ported by and extend above the supports or _al
ternatively the article may be mounted on the
supports in an inverted position from that shown
in the drawings so that the articles are suspended
downwardly between the supports. This inverted
arrangement may be advantageous in certain
cases where the article is so shaped that it might
thereby to“ turn an object about an axis trans
verse to its forward movement simultaneously 50
otherwise tip over.
6. Apparatus for blast cleaning metal articles
including, an abrasive throwing wheel operative
to project a fan-shaped stream of abrasive hav
ing an elongated impingement pattern, a plu 55
rality of spaced guiding elements for the articles
to be treated positioned outside of the path of
the projected abrasive stream, means for ad
vancing the articles to be treated along said guid
ing elements through said stream in the same 60
general direction as the longitudinal axis of said
impingement pattern, and means for imparting
a higher velocity in a‘forward direction to an
'article along one of said guiding elements than
While certain novel features of the invention
have been disclosed and are pointed out in the
annexed claims, it will be understood that var
ious omissions, substitutions and changes may be
made by those skilled in the art'without depart
ing from the spirit of the invention.
What is cl/aimed is:
1. Apparatus for abrasively treating metal ar
ticles including, a plurality of endless conveyòr
belts, means mounting said belts in spaced and
generally parallel relation to support >the articles
to be treated therebetween, an abrasive throw
ing wheel operative to project a stream of abra.
sive and means for driving said belts at different
relative speeds-thereby to turn said article about
an axis transverse to it's forward movement si
multaneously with its forward movement through
70
scale and other foreign undesirable materials 40
from the surface of metallic objects including, an
abrasive throwing wheel operative to project a
fan-shaped stream of abrasive having an elon
gated impingement pattern, spaced conveyor ele
ments positioned on opposite sides of said Wheel, 45
means for advancing said conveyor elements at
diiîerential speeds and in the general direction of
the longitudinal axis of the impingement pattern,
said streams.
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2. Apparatus for treating metal articles in
cluding, means for projectingl a. stream of abra
with its forward movement through said stream. `
along another of said guiding elements whereby
‘to rotate each article about an axis transverse to
its direction of forwaro movement. ,g
‘7. Apparatus for abrasively cleaning metal ar
ticles including, an abrasive throwing wheel op 70
erative to project a stream of abrasive, a plural
ity of spaced and generally parallel conveyor
members adapted to support an- article' to be
\, belts, article guiding means associated with’said, treated, and means for driving said conveyors'at
75 spaced. belts, means for driving said beltsy at dif-1 selected differential speeds to carry the article 75
sive particles, a pair of spaced article-supporting
5
2,131,767
through said stream and simultaneously rotate
means for driving said conveyor members at se
the same in said stream.
lected diiîerential speeds to convey the work piece
through said streams and rotate the work piece
‘
8. Apparatus for blast cleaning metallic Aar»
, ticles including, a plurality of spaced supporting
elements, an abrasive throwing wheel operative
to project a fan-shaped stream of abrasive have
ing an elongated impingement pattern, said wheel
being arranged so as to direct said abrasive
stream between said spaced supporting elements,
10 means for :guiding the article to be cleaned
through the abrasive stream, and means for im
‘ parting a higher velocity in a -forward direction
to the `article to be cleaned along one of said sup
porting elements than another of said supporting
_elements whereby to rotate said article in said
stream.
.
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9. Apparatus for blast cleaning metallic ar
ticles including, an abrasive throwing wheel _op
erative to project a fan-shaped stream of abra~20 sive at blasting velocities, a pair of spaced and
in said streams whereby both upper »and lower
surfaces of the work piece supported on said con
veyor members are subjected to abrasive treat
ment.
l1. In an abrading machine, a pair of endless
conveyor belts, means mounting said belts in
spaced and generally parallel relation with the
supporting surfaces thereof positioned to support
and conñne a work piece to be treated therebe
tween, an abrasive throwing wheel operative to
project a stream of abrasive at abrading veloci
ties against the work piece supported on said
belts, and means for driving one of said belts at
a higher velocity in a forward direction than the
other belt whereby to rotate the work piece under
treatment in the yabrasive stream and advance
the work piece through said stream.
12. Apparatus for blast cleaning and removing
scale and other `foreign undesirable materials
for carrying the articles to be treated, means forl ' from the surface of metallic objects including,
driving said conveyor means at diñerentlal speeds an abrasive throwing wheel operated to project a
fan-shaped stream of abrasive having an elon 25
25 `to simultaneously rotate andv advance the ar
ticles to be treated through said stream thereby gated impingement pattern, spaced conveyor ele
to subject the sides faces vas well as the advanc» ments positioned on opposite sides of said wheel,
means for advancing said conveyor elements at
ing and following faces of said articels to the im
pinging action of the fan-shaped abrasive stream; differential speeds and in the general direction
l0. 'In an abrading apparatus, a pair of spaced of the longitudinal axis of the impingement pat
Si)
and generallyl parallel conveyor members adapted tern thereby to turn the object under treatment
to support therebetween a metal work piece to be about an axis transverse to its forward movement,
treated, an abrasive throwing wheel mounted said conveyor elements having their respective
above and an abrasive throwing :wheel mounted supporting surfaces transversely inclined toward
generally parallel supporting elements, conveyor
means extending along said supporting elements
below said conveyor members and in such a man
one another whereby the object supported there
ner as to project their respective abrasive streams
generally between said conveyor members, and
on has a limited area of contact therewith.
'
DAVID C. TURNBULL.
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