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Патент USA US2116153

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May 3, 1938.
w. I_„KEEFER
2,116,153
ABRADING AFPARATUS.
Fi_1ed sept. 2,' 1937
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Ma'y 3, 1938.
w. L. KEEFER
' 2,116,153
ABRADING APPARATUS
Filed Sept. 2, 1937
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5 Sheets-Sheet 2
May 3, 1938.
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w. l... KEA-:FER
ABRADING APPARATUS
Filed sept. e, 1957
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2,115,153
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s shéets-sheet s
Patentedl May 3, 1938
2,116,153
`I UNITED STATES
PATENT _()FFICE
2,116,153
"
ABRADING APPARATUS
`
Walter L. Keeler, Hagerstown, Md., assigner to
Pangborn lCorporation,
Hagerstown, Md., a
corporation of Maryland
Application September 2, 1937, Serial No. 162,214
26 Claims.
(Ci. 51.-9)
'I‘he present invention relatesto abrading ap-- ‘ceeds in connection with the annexed drawings
paratus, and more particularly to apparatus and from the appended claims.
In the drawings:
,
,
‘known in the trade as blast cleaning machines
Figure 1 is a longitudinal sectional view of lan
embodying means for projecting a stream of
abrasive in thel form of sand or steel abrasive> ‘apparatus embodying the invention.
G
‘ ,Figure 2-is a view looking from the right hand
against castings or other articles of Work to
`- cleaned of surface accumulations.
'
side of the machine shown in Figure l and parts
Although centrifugal abrading machines have have been 'broken away in order to more clearly
been known for years in the abrading art, both’
o with directional control and without directional
control, the problem of wear of the blades and
other parts has been a serious consideration, re
gardlessv'of whether they are of the “slider” type,
wherein the abrasive is admitted at low velocity4
15 over the inner ends. of the blades and is continu- »
20
show the structure involved.
’
Figure 3 is a sectional view taken on the line 10
3_3 o_f Figure 2 showing the parts as .they appear
when viewed in the direction of the arrows.
Figure 4 isa fragmental sectional view of a
part of wheel shown in Figure 1 and illustrates
one of the abrasive discharge openings.
’
15
ously accelerated to the blade tips or whether
they are wheels. embodying batter blades where
Figure l5 is an elevational view of the feed
chamber of the machine of Figure 1, and illus
the entire abrading velocity is imparted to the
trates the abrasive dellector.
abrasive by a single instantaneous impact there
Figure 6 is a. longitudinal sectional view simi
lar to Figure l but illustrates a modiiled form of
the invention.
Figure 7 is an elevational view looking from
with.
Y
‘
‘
-
Although the slidervtype machines in commer
cial use today represent a great advance in the
art over the machines heretofore in use they do
not possess all oi' the operating characteristics
desired
and fall considerably short of the “ideal”
25
machine which would pick the abrasive up with
out shock and gradually Vmove it out to the
periphery of the rotor without sliding it and then
discharge it without wearing influence upon any
, part of the machine.
.
-
the right hand‘side o_f Figure 6 and parts have
been broken away in order to more clearly show
the structure involved.
_,
„
Figure 8 is a fragmental sectional view of the s
machine shown in Figures 6 and 'l and illus
trates the rotatable disc employed to deflect lor
dislodge the abrasive from the inner surface of
the wheel.
,
'
It is accordingly a primary object of this in
Figure 9 is a longitudinal sectional view
vention to provide an abrasiveA throwing wheel Vthrough a further modified form oi' wheell also
which does not employ any blades whatsoever forming part of the invention.
and more nearly approaches the “ideal” abrading
Figure 10 is a partial elevational view of the
apparatus than anything heretofore proposed. .
machine shown in Figure 9 and illustrates it as
It is another object to devise a centrifugal it appears when viewed from the right hand side
of that ligure.
._
,
abrading machine wherein the abrasive is ad
Figure 11 is a fragmental partial sectional view
mitted near the axis of rotation, moves outwardly
with substantially no propelling influence and »of ‘machine shown in Figures 9_ and 10 and shows
then is released from the wheel substantially at the deñecting members.
the peripheral speed thereof without having» a
Figure 12 is a face view of a bladed rotor-em
batting or other impacting action applied thereto. bodying the abrasive propelling mechanism of
It is a further important object to design a the invention.
'
'
wheelfor mechanically vthrowing abrasive which
Figure 13 is 'a longitudinal sectional view
employs no blades whatsoever, retains a prede
through the wheel shown in Figure ,12, and in
.ermlned quantityof abrasive in the wheel at all this form the defiecting disc has been- only dia
times and discharges a predetermined `quantity grammatically illustrated.
p
at each rotation of-'the wheel and imparts a high
Figure 14 is an enlarged sectional view of the
abrading velocity to‘the abrasive.
' My invention also aims to provide an abrasive
and feeding and propelling assembly that may be
used in combination with centrifugal bladed ro
tors for imparting directional control thereto.
Further objects of the invention will become
._ apparent as the accompanying speciñcation pro
35
'
‘
4-0
45
feeding mechanism employed inthe machine of
Figures 12 and 13 andl illustrates the manner in 50
_which the abrasive is introduced into the abrasive
chamber and discharged therefrom.
-
`
With continued reference to the .drawinga‘
whereinlike reference characters have been em
ployed throughout the several views thereof to
2
2,116,153
designate like parts, and with- particular refer
ence to Figures 1 to 5, inclusive, the machine
upon whose inner surface the abrasive is cen
a pair of bosses 34 on member 22 by means of a
pair of screws 35.
Deñector 33 is curved as seen in Figure 2, and
trifugally built up and the layer of abrasive- is
its outer edge lies in close proximity to the in
broadly comprises a hollow rotatable member
'
instance I have shown it as being supported by
automatically discharged from the member at a ner surface of the rotor, with the result that
predetermined point in rotation by means of when the wheel is rotated the layer of abrasive
a defiector which directly engages the layer of .. lying on surface 3| will be continuously acted
upon by the defiector and deflected into open
abrasive deposited within said member.
f
.
10
The hollow member just referred to includes a ings I5.
Referring to Figure 3, Áwith the Wheel rotating
head I0, which is mounted on a shaft II. The
latter is journaled for rotation in any suitable in the direction indicated by the arrow, an abra
sive particle is indicated at 38 as just contacting
As seen in Figure 1, head I 0 is hol
manner.
lowed out from one side and is provided with an blade 33. This particle, prior to engagement
abrasive accelerating groove I2 at its periphery thereof with the defiector possessed a velocity 15
which merges with a radial face I3 of the rotor. Vr or a velocity equal to the peripheral speed of
Head IIJ is also provided with a flanged portion the rotor.
Upon engagement of the particle with defiector
Il in which a plurality of abrasive discharge
openings I5 are provided.
33, it assumes a velocity having an axial com
In order to provide for wear >oi’ the parts and
make it possible to replace certain parts of the
machine Without replacing the entire rotor, a
wear bushing I1 is disposed in each opening I5
ponent Vd and the two combined give a resultant 20
velocity Vx. Therefore, there is continuously
deposited on the inner surface 3| a layer of
abrasive and this layer of abrasive is being con
tinuously discharged from the wheel at one point
and as seen in Figures 1 and 4, each wear bush
ing I1 is provided with a portion extending into
opening I5 and is provided with an inclined rear
wall I8 for a purpose that will presently appear.
A disc 2| is preferably secured to the end of
the rotor for preventing inadvertent escape of
abrasive,.but it may be omitted if desired.
'I'he abrasive may be admitted to the interior
of the rotor in any suitable manner, but I pref
erably employ a generally cone shaped member
22 having a funnel portion 23 and which is
mounted on a shaft 24. Shaft 24 is journaled
in a bearing 25 provided on a bracket 26 and the
latter is secured to a stationary base 21.
Feed chamber 22 is accordingly mounted for
rocking movement about the axis of rotation of
40 the rotor and it is provided with a handle 28
for manipulating it into its adjusted position. A
set screw 29 is threaded into bracket 26 for lock
ing shaft 24 in its proper adjusted position.
Assuming that shaft II is driven by any suit
able prime mover at a speed of approximately
2500 revolutions per minute, and abrasive is ad
mitted to spout 23, it will travel at relatively low
velocity until it strikes the mass of abrasive in
the abrasive acceleration groove I2, where it will
50 be picked up and rapidly attain the peripheral
speed of the rotor. In view of the fact that when
the Wheel is in operation groove I2 is filled with
abrasive, theaccelerating action imparted to the
abrasive is taken by the abrasive itself that is
accumulated in the groove, and accordingly Wear
of the acceleration groove walls is minimized.
Assuming that the wheel is rotating as just de-I
scribed, the abrasive will fill up groove I2 and
then spill over onto the internal surface 3| of
the rotor. The parts are so designed, and rotor
surface 3| is of suilicient Width so that as the
abrasive builds up it will assume the form of a
cone with its inner surface inclined at an angle
equal to the angle of repose of the particular
65 abrasive, and during normal operation will not
spill into openings I5 unless it is acted upon by
the defiector, which will now be described.
by reason of defiector 33 engaging it and caus
the discharge openings.
Y
In view of the fact that the abrasive lying
centrifugally on surface 3| is rotating at~ the
peripheral speed of the wheel, and as this speed 30
is selected to correspond to the desired abrasive
discharge speed, it is unnecessary to impart a
blade action upon the abrasive as it is spilled
through opening I5 in order to impart an abrad
ing velocity thereto. Wall I8 of opening I5 is 35
accordingly inclined as shown in Figure 4 in
order to avoid an impelling influence being given
to the abrasive as it passes through opening I5.
However, if desired, the combination of the rim
discharge and blade action may be used, and in
a succeeding form of the invention I have shown
a machine of just this character.
In view of the fact that the point of discharge
of the abrasive is dependent upon the angular
position of defiector 33, the wheel may be caused 45
to fire in any direction by loosening screw 29 and
rocking the feed chamber 22 in the proper direc
tion> to cause the machine to discharge in the
desired direction. As a matter of fact, if it is
desired to have the machine discharge upwardly 50
the feed chamber may be located in the position
shown in the drawings, but the defiector may be
secured thereto at a point 180 degrees removed
from the location shown in order to make the
Wheel fire upwardly rather than downwardly. If 55
after the Wheel is in use it is found that the
spray angle or the width of the centrifugal blast
is too narrow, the defiector may be moved closer
to the Wheel so as to deflect'a greater depth of
abrasive for each revolution, or the defiector may 60
be longer so as to deflect a greater body of
abrasive or a flange may be provided on the de
fiector to dislodge a greater quantity of abra
sive. To this end member 33 may be adjustably
mounted on chamber 22 or any other stationary 65
part of the machine.
If desired, however, two deñectors may be
One form of defiector means that may be used placed in series at different angular points so as
to dislodge abrasive at a predetermined point in < to increase the width of the abrasive spray angle.
.Although I have shown a particular feed cham
70 the revolution of the rotor, is shown in Figures
3 and 5, and it consists of acomparatively thin'
blade 33 made from -any suitable heat resistant
material, such as tungsten alloy steel. y
Deflector blade 33 may be stationarily sup
75 ported in any desired manner but in the present
25
ing it to be pushed axially into registry with
ber for introducing the abrasive in the rotor, it
is to be understood that if desired various other
forms of abrasive admitting means may be used.
For instance, abrasive may be admitted at the
center of a pair of grooved rotating discs and be 75
3
2,116,153
allowed to trickle ~outwardly thereover and grad~
ltace 45 and/or edge 59 may be formed in a
ually4 accelerated.
separate removable and replaceable wear element'. ,
It will be understood that a disc deiiector like
'
'
Taking up the formrof invention illustrated in
Figures 6, 7 and 8, the major differences between
this device and the first described form oi’ the
invention reside in the use of a wheel having pas
sages for gradually accelerating abrasive as it
moves outwardly and also, a rotatable 4disc which
is employed to deflect the abrasive at a predeter
10 mined point in rotation.
In this form of the
invention a rotor 4D is mounted on shaft 4I and
is provided with a pair of abrasive accelerating
that used in the form or the-invention illustrated . l
in Figures 6, 7 and 8 may be used instead oi' the
'.deñector 33 in the form of the invention illus
trated in Figures 1, 2 and 3.
= Referring now tu Figures 9 and'lo or the dra'w- '
ings, I have shown a wheel somewhat similar to
the wheels previously described and embodying 10
a rotor 60 mounted on a shaft 6l and having a
rim portion 82 to which is secured an end plate 83. .
flanges“ and 43, an abrasive acceleration groove ' In rim portion 62 there are provided a plurality
44 and an abrasive supporting or deposit sur
of inserts 64 aiîording a plurality of discharge
face 45.
-
openings 65.
,
.
15
v In this form oi.' the invention no acceleration
46 is similar to that previously described with
the exception that it provides a pair of annular
grooves 41 and 48 which cooperate with flanges
groove is employed as the abrasive is dumped into
20 42 and 43 of rotor 40 to deñne a tortuous passage.
Thereforel when the abrasive introduced in cham
ber 46 ñrstencounter's -ilange 42 it is partially
accelerated, fills up to the angle of repose and
'spills off the edge into groove 41 where it is
25 deilected onto flange 43. Flange 43 being fur
ther. from the axis of rotation is rotating at a
greater peripheral speed than ñange 42, the
abrasive accordingly receives further >acceleratitm
when'it strikes this viiange. 'I'he abrasive then
30 spills oi’f flange 43 into the acceleration groove,
which, being located still further from the axis
of- rotation further accelerates the abrasive.~
The feed chamber is mounted on a shaft i5 as
before, which is journaled in a bracket 5l carried
35 by a base 52. ' An operating handle 53 is employed
to rock the feed chamber into vthe proper an
gular position and the set screw 54 is employed
l
-
In this form of the invention feed chamber
to lock it in place.
.
`
a recess 66 provided in the rotor disc and builds
up kon surface 61vwhere it isI deflected _into dis
charge opening 65 by either a stationary de?ector
member or a rotatable disc as described in con
nection with the first form ofthe invention.
In this form of the invention a cage is em
ployed embodying a cone portion 63 which is se
cured to a hub portion 1l by a plurality of cap 25
screws 12. < Portion 1| is provided with a funnel
portion ‘I3 and it is secured to a hollow shaft 14
by means of a key 15 and a'set screw 1B. Shaft
14 is journaled in a support 18 and is provided
with an operating handle 19. Shaft 14 is ad
justably locked in ñxed position by nut and bolt
assembly 8i which cooperates with an arcuate
slot 82 in support 18', whereby the parts may be
locked by tightening the nut and bolt iassembly.
Journaled in sleeve 14 is a shaft 53 to which 35
is secured a handle t4 by means of a set screw 85.
Handle i carries _a detent 86 which cooperates
with serrations il formed on`a downward ex
In this form of the invention a disc 55 co
operates with the rotor to spill the abrasive over
the side edge of the rotor and it is journaled in a
bearing 51 carried by an arm 58 which, as shown,
is an integral part of the feed chamber, with the
tension 58 of handle l5. This device is similar to
that described in connection with the drst form 40
of the invention, the abrasive being admitted in
chamber 5d and piling up against the inner sur
face lil of the rotor and being dislodged orde
result that the direction of discharge may be _~ fiected through opening 55 by means oi’ a sta
Ai- ._ tionarily supported deflector either oi the sta
though wheel 55 may if desired be driven by a tionary plough or shoe type shown in Figure 5 or
45 controlled by rocking the feed chamber.
-separate prime mover, it has been found that the - the rotatable disc type shown in» Figure 8.
l
friction _of the abrasive upon the wheel is s
have however, illustrated it as comprising a shoe
cient to Acause it to undergo independent rotation. 5d which is adjustably mountedon chamber 58
50 Disc 56 may also, ii’ desired, be adjustably sup- ' by a pair of stud and nut assemblies 85. Shoe im 50
ported so as to dispose its axis at any suitable is inclined in a manner similar to shoe 33 oi
inclination tothe axis of the wheel.
l
Figure 5 and it may be adjusted, either to vary the
fBy reason of the fact that the peripheral speed vdischarge oi the machine or to compensate for'
of disc 55 is substantially equal to the peripheral t wear by loosening the stud and nut assemblies.
In this ioi‘rn of theinvention there is employed 55
55 speed oi' rotor lill, it is apparent that it will un
dergo a minimum abrading action during opera
a primary deñector blade i5 which acts upon the
tion, and at the same time smoothly spills the abrasive before blade iid comes into play and as
abrasive over the side or discharge edge 55 of the the initial contact 'is oi greatest magnitude the
rotor.
460
'
'
Although l have illustrated disc 5t as lying at
a predetermined angle with respect to the axis
of rotation of rotor du, it is to be understood that
vthis angle may be increased or the disc axis in
clined so as to dispose the disc in other direc
65 tions for discharging the. abrasive from the wheel,
depending upon the particular work being han
dled, the> abrasive used, and other inñuential
factors.
It is accordingly seen that with this forni oi l
70 the `invention vthe abrasive ~continuously spills
over the edge 59 of rotor 40 in a smooth unbroken
stream of narrow width, whereas in the ilrst form
'of invention described, the abrasive discharge is
primary blade takes the most wear. Accordingly
in order to `make blade 5d quickly and easily' ad-- 60
justable to compensate for wear it is mounted for
guided sliding movement in a recess in chamber
55 and projects outside chamber 55 adjacent the
leading edge of blade lili.
_e
` Pivotally secured to blade-55 by means of a pin 65
5l is'a connecting link di, which in turn is con
nected by means oia crank pin 53 to a disc 5d
. rigidly carried by shaft di.
f
It -is accordingly apparent that when the ma
chine is placed in operation blade 95 will initially 70
contact and- apply a primary deiiecting action
upon the layer of abrasive accumulated on sur
face 5l and blade it will apply a secondary de-'
discontinuous in the sense that it is successively ñecting action thereupon. When the outer end
discharged through openings l5. If desired sur- ` of bladev 55 has A.become worn through contact 75
.2,116,153
4
of the abrasive therewith lever 84 may be rocked
so as to cause link 92 to project blade 98 out
' wardly into a new position.
The parts have been
illustrated as “new” and hence in Figure l0 le‘ver
ch ' 84 may be moved step by step through 180° be
fore blade 90 is unfit for further service. Also,
from time to time blade 88 may be adjusted out
wardly to,c0mpensate for4 wear in the manner
previously described.
claims are therefore intended to be embraced
therein.
.
What is claim-:d and desired to be secured by
United States'Letters Patent is:
4l. In an abrading apparatus,
a structure
mounted for rotation at‘high speed, said struc
ture providing a. generally annular surface fac
ing toward 'the'axis of „rotation of said struc
ture, means for depositing abrasive upon said
`
In Figures 12, 13 and 14, I have shown a com-f surface, and discharge means for dislodging the 10
10
bination ofa rim discharge abrasive throwing deposited abrasive from said surface at a prede
termined point in the rotation of said structure
wheel used as the feeder for a bladed abrasive "
for projecting said abrasive at an abrading ve
throwing wheel.
locity.
With continued reference to these figures, a V
2. The abrading apparatus set forth in claim l, 15
15 rotor H0 mounted on a shaft IH is provided
with a plurality of abrasive propelling blades l I2.
The blades terminate short of the axis of revolu
tion to define a central spaceand mounted in
this space is a chamber H3 and it is preferably
20 removable so that it may be taken out and re
placed when _it has become tooy worn for fur
ther service.
A
. The abrasive >is fed to the interior of mem
425
ber H3 by meansof a feed conduit H5. Jour
naled in conduit l I5 or in any other suitable man
ner is a shaft H6, carrying a- spider H1 which
in turn supports a disc H8. In this lforml -of the
_invention abrasive is introduced through chute
H5 and piles up to its angle of repose on the point in the rotation of the parts disc H9 de
fiects a layer of abrasive 'over the edge |2| of
member H3 onto the inner ends or heels of the
throwing blades. In view of the fact that the
l35 direction of discharge of the abrasive from mem
ber H3 is substantially tangential the abrasive
30 interior of member H3, and at a predetermined
is picked up by the inner ends of the blades with
negligible impact.
-
The direction of discharge from this wheel
may be controlled in a manner similar to that ,
effected in the wheels previously described,- name
1y,` byadjusting angularly the point at which`
the deñector cooperates with the abrasive lying
on the inner surface of member H3. Accord
ingly it is only necessary to adjust. spout, H5
and shaft H6 to locate disc H9 in the proper
` position to effect the desired discharge of abra- r
sive.
~
wherein said discharge means comprises a sta
tionarily supported device for directly engaging
the deposited abrasive and imparting an axial
movement thereto.
3. The abrading apparatus set forth in claim 1, 20
wherein said discharge means comprises a sta
tionarily supported device mounted adjacent said
structure _and cooperating with said deposited
abrasive, said device being lmovable into a plu
rality of angular positions with respect to the 25
axis of» saidl structure, whereby the direction of
the discharge of abrasive from said structure
may be varied at will.
-
4. In an abrading apparatus, a structure
-mounted for rotation at high speed, said struc
30
ture providing a generally cylindrical surface fac
ing the axis of rotation of said structure, means
for depositing abrasive upon said surface while
said structure is rotating, and discharge means
for moving said deposited abrasive axially so 35
as to discharge it from one edge of said surface
when said abrasive attains a predetermined posi
tion in the rotation‘ of said structure.
5. The abrading apparatus set forth in claim 4, ' ‘
wherein said discharge means comprises an in 40
clined deflector blade stationarily supported ad
jacent said structure and operable to engage and
deflect said deposited abrasive axially over said
one edge of said surface.
.
6. The abrading apparatus set forth in claim 4, 45
wherein said discharge means comprises a rotat
able member disposed adjacent said structure
and operable to directly engage said _deposited
.
Although I have shown member H8 as being
abrasive.
,
1
Y
A'7. In an . abrading apparatus, a structure 50
50 driven @synchronously with the rotor and feed- ß mounted for rotation at ¿high speed and com
ing the abrasive over the inner ends of the blades,
it may be independently driven and feed the abra
sive over the side edges of the blades without
departing from the spirit of my invention. Also,
55 I have illustrated certain parts of the appara
tus as’being integrally formed with the rotor.
but it is tobe understood that if desired sepa
rate replaceable wear elements may be provided._
prising a hollow member, means for depositing
abrasive upon the inner surface of said member
while the latter is rotating and abrasive discharge
means for engaging and deiiecting said abrasive 55
over one end of said member while the same is
rotating for discharging said abrasive at an
abrading velocity.
-
~ 8. The abrading apparatus set forth in claim '7,
In all of the forms of the invention ,the abra- ' wherein said first named means is operable to
60 sive is deposited _on lthe inner surface of the deposit abrasive upon said member at a point suf
rotor and lbuilds up to its angle of repose and ficiently remote from said one end of said mem
therefore the deñector need apply but> force ber so that said abrasive will build up to its
angle of repose adjacent to but short of said
enough to cause the abrasive to move to the dis
one end `of said member, whereby said abrasive
charge point. Therefore, the wear on the de
65 flector is minimized.
will be discharged from said member only when
'
'
it is engaged bysaid abrasive discharge means.
The invention may be embodied in other spe
9. An abrading apparatus comprising a struc
ture mounted for. rotation at high speed, said
embodiment is therefore to be considered in-all r structure embodying a hollow lmember rotatable 70
70
respects as illustrative and not restrictive, the with said structure with its axes coincident to
scope of the invention being indicated by theV theA axis of rotation of said structure, said mem
appended claims rather than by the foregoing ber having a plurality of discharge openings pro»
description, and all changes which come within vided therein disposed in the same general plane
the meaning and range of equivalency of the of revolution, means for depositing abrasive upon
ciñe forms without departing from the spirit or
essential ,characteristics thereof. The present
_
5
9,116,153
the inner surface -of said member in- a region _ charge means comprising a primary deflecting
spaced vfrom _said discharge openings. and means
located within said member for engaging the lay
element and a secondary denecting element for
en'gßßlng the deposited abrasive, said primary de
er of abrasive deposited within said member and
iiecting element having means for adjusting it
moving it axially to said discharge'openings.
_
10. In Van „abrading apparatus, ' a structure
toward and away from said generally cylindrical
mounted for rotation at high speed, saidstruc
ture providing _an annular inwardly facing abra
sive supporting surface terminating at one end in
mounted forV rotation and providing a generally
` 17. In an abrading apparatus, a head structure
annular surface facing toward lthe axis of rota
10 an abrasive discharge edge. means for depositing
tion of said head structure, means for depositing 10
abrasive upon said surface while said structure is
abrasive upon said surface. and control means forv
Y rotating and allowing said abrasive to attain the-
causing the deposited abrasive to discharge _from'b r .
full peripheral speed of said inner surface, said
abrasive being deposited upon said inner surface
at a point spaced from said discharge edge and
adapted to build up thereon to its angle 'of repose
said surface at a predetermined point‘in there-‘ff '_
tation of said head at an abrading velocity.;
18. The apparatus set'forth in
in said control means comprises a
without spilling over said discharge edge, and a -
rotatable disc mounted adjacent said structure
for‘deilecting said deposited abrasive over said
20 discharge edge and discharging it at an abrad
.ing velocity.
'
A11. The abrading apparatus set forth in claim
10, wherein saidV structure is- provided with an
abrasive acceleration groove adjacent said an
25 nular surface which is adapted to accumulate a
_body of abrasive when said structure is rotating.
12. 'I'he abrading apparatus set forth in claimv
l0, wherein said structure is provided with means
for accelerating the abrasive in stages before it
30 is depositetl upon said annular surface, whereby
said abrasive promptly attains the full peripheral
speed of said structure upon contact therewith. 13. In an abrading apparatus, a structure
mounted for rotation at high speed and having
35 a plurality of abrasive propelling blades provided
thereon, and means mounted adjacent the center
of rotation of said structure for feeding a stream
of abrasive over the edges of said blades for
causing the abrasive to be picked _up and-dis
'dil charged by said blades in a predetermined direc
`
17, wherej-'
¿
tating about- an axis inclined to theßaxis‘offsaid
head structure and ico-operatingïwithïthe
sive deposited _on said annular surface.'u v
'
_
19.v In an abrading apparatus. 'a-fhead structure
- mounted for rotation and having’an [annular
abrasive accelerating groove facing toward. the
axis of rotation of said head, means for deposit- -
__ingabrasive 'in said groove, said head structure
also providing a generally annular, inwardly fac
>ing surface adjacent said groove and adapted to ‘
receive abrasive overflowing from said groove and control means for causing the discharge of abra-4 ‘
sive from said annular surface at a predeter
mined point in the rotation of said head struc
ture.
~
.
30
_
2i). In anabrading apparatus, Aa rotor mounted
for rotation at high speed and having a plu
rality of abrasive propelling Ablades provided »
thereon; a generally cylindrical rotating feed 35
chamber mounted adjacent, the axis of rotation «
of said rotor; means for-feeding abrasive to said
feed chamber for causing vit to centrifugally build
up to its angle of repose on the inner surface of
said feed chamber; and means for denecting the
accumulated abrasive from said feed chamber
into‘the path of said abrasive propelling blades at
a predetermined point in the rotation of said ro
tion, said means comprising 4a rotatable element
providing an inwardly facing surface; means for
feeding abrasive to said surface; and means for
dedecting the abrasive accumulated on said sur’ ' tor', for causing the abrasive to be picked up and
face into the path of rotation of said abrasive pro
discharged by said blades in a predetermined di 45
pelling blades.
.
.
`
rection.
,
I
_
1d. lin an abrading‘apparatus, arotor having
a plurality of abrasive propelling blades terminat
for rotation at high speed and having a plurality
ing short of the axis of rotation to define a cen
of abrasive propelling vblades provided thereon,
tral abrasive admitting space, abrasive feeding
dl. lin an abradlng apparatus, a rotor mounted
said blades terminating short of the anis of ro
_means mounted in said space and rotating syn
chronously with said rotor providing an inwardly
tation of said rotor to denne a central space; a
abrasive upon saidsurface, and abrasive deflect
ing means for deñecting the abrasive deposited
of said blades, means for feeding abrasive to said
. on said surface over said discharge edge into' the
lates on the inner wall thereof, and `means for'
50
generally cylindrical feed chamber secured 'to
facing abrasive supporting surface, said surface » said rotor, and projecting into said central space,
having a discharge edge disposed between the in
said feed chamber terminating at one end in a'
bb ner ends of said blades, means for depositing discharge edge located adjacent the _inner ends 55
dll
path of rotation-of the inner ends of said blades. /dehecting the accumulated abrasive from said
l5. The abrading apparatus set forth in claim feed chamber over the discharge edge thereof
14, wherein said abrasive deñecting means com
and over the inner ends of said blades at a pre
prises a disc .disposed within said abrasive feed
determined polnt in the rotation of said rotor,
ing means and mounted for rotation about an` for causing `the abrasive to~ be picked up and'dis
axis which is inclined with respectto the axis of charged from said blades in a predetermined
65 rotation of said rotor.
i6. In an abrading apparatus, a structure
ym
feed chamber, whereby it centrifugally accumu
mounted for rotation at high speed, said struc
ture providing a generally cylindrical surface
facing the axisA of rotation of said structure,
means for depositing abrasive upon said surface
while said structure is rotating. and discharge
direction.
I
,
'
,
22. The abrading apparatus deñned in claim 2l,
wherein said rotor comprises mat least one disc
>like structure and said blades are disposed with
their side edges contiguoim to, one face thereof,.
and said feed chamber is secured to said struc
ture with its discharge edge located between said
'means for moving said deposited abrasive axially _ structure and a plane normal to the axis of rota
so as to discharge it from one edge of said surface tion of said rotor and disposed midway between
when said abrasive attains a predetermined po
the side comes of said abrasive propelling blades.
75 sition in the rotation of _said structure, said dis
23. The abrading apparatus dedned in claim 2l.,
70
6
2,11%,153
wherein the diameter of said feed chamber is ap
proximately equal to the length of said blades.
to the path of _rotation of said abrasive propelling
blades at a predetermined point in the rotation
_of
said rotor for causing the abrasive to be picked
24. In an abrading apparatus, a structure _
up and discharged by said blades in a predeter
mounted for rotation at high speed and having mined direction, said disc having a central open
a plurality of abrasive propelling blades pro
ing, said feeding means being operable to dis
vided thereon, a rotatable feed chamber mounted charge abrasive into said rotatable element
adjacent the axis of rotation of said structure through the central opening- of said disc.
'
and having an inwardly facing surface, means
26. In anv abrading apparatus, a rotor having
for feeding abrasive to said feed chamber, and a plurality of abrasive propelling blades provid
defiecting meansfor deñecting the abrasive ac
ed thereon, said blades terminating short of the
10
cumulated on said surface into the path of rota
axis of rotation of said rotor to define a central
tion of said blades at a predetermined point in space;
said rotor having in said central space an
the rotation Aof said structure, said deflecting inwardly
facing abrasive accumulating annular
means being adapted for selective rocking move
ledge rotatable synchronously with said rotor and 15
ment
about
the
axis
of
rotation
of
said
structure
15
having a discharge edge located adjacent the
into a plurality of different angular positions, path of rotation of the inner ends of said blades,
whereby the point in the rotation of said struc-‘ and between the planes of rotation defined by
ture at which the abrasive is deñected into the the side edges of said blades; means for depositi
path ofrctation of said blades’ may be selec
ing abrasive upon said ledge, and means for de 20
20 tively varied.
lfleeting
the accumulated abrasive from said ledge
25. In an abrading apparatus. a rotor having
over the discharge edge thereof and onto the in
a`plurality of` abrasive propelling yblades pro
ner ends of said blades at a predetermined point
vided thereon; arotatable element mounted ad
in the rotation of said rotor, for causing said
jacent the axis of rotation of said rotor and pro
abrasive to be discharged in a predetermined di 25
25 viding an inwardly facing abrasive accumulating
surface; feeding means i'or supplying abrasive
to said surface;~ and a rotatable disc for deilect
ing the abrasive accumulated on said surface in
rection from said rotor.
'
`
WALTER L. man.
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