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Jan. 17, 1950
w. H. MEAD ETAL
2,494,773
SURFACE TREATING APPARATUS
Filed Nov. 13, 1948
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ATTORNEY
‘
Jan. 17, 1950
w. H. MEAD EI‘AL
2,494,773
SURFACE ‘ TREATING ‘ APPARATUS
Filed Nov. 13, 1948
z'sheets-sheat 2
51
énpes -o ASUIPRLY
1/4
INVENTORS
WILL/L4H H. MEAD
ANDREW BUGHA/V
QMZZw
A 7' TORNEY'
Patented Jan. 17, 1950
2,494,773
UNITED STATES PATENT OFFICE
‘
2,494,773
SURFACE TREATING APPARATUS
‘William H. Mead, Oakland, and Andrew C.
Buchau, San Francisco, Calif., assigno/rs, by
mesne assignments, to said Mead
Application November 13, 1948, Serial No. 59,924
5 Claims. (0]. 51-8)
1
2
1
This invention relates ‘to surface-treating ap
paratus. In particular it relates to improvements
in the operating head of an abrader in which the
abrasive material is impelled against a working
area by a strong pressure blast and is then re
moved from the working area along with the
abraded particles by an even stronger suction
current, for collection in a receptacle.
This invention is particularly well suited to
solve the problem of cleaning machinery having
uneven or relatively intricate surfaces, such as
tire molds and the like. Ordinary abrasive clean
ing devices widely scatter the grit and abraded
A further object of this invention is to provide
an operating head which can be adjusted to vary
the area and intensity of abrasive impingement,
the adjustmentJ also compensating for wear of
parts and for different types of surface-treating
materials which may be employed.
Other objects and advantages of this inven
tion will appear in the course of the following
description given in accordance with U. S. Re
vised Statutes Sec. 4888, though‘without intend
ing to limit the scope of the invention otherwise
than as claimed.
In the drawings:
Fig. 1 is a view in elevation and in section of
cleaned. This is not only a hazard, but con 15 an operating head which embodies the prin
ciples of this invention; for purposes of clarity
siderable time must be spent in cleaning up the
the bristles in the rear are omitted, although they
debris once the abrasive operation is complete.
encircle the head as shown in Fig. 2;
An alternative abrading method is to place the
Fig. 2 is a reduced bottom plan view, looking
piece being cleaned within a blast cabinet, but
this technique is obviously of limited application 20 up into the open mouth of the head shown in
Fig. l; and
‘
and is somewhat impractical at best.
Fig. 3 is a view in elevation, somewhat sche
The problem has been how to provide a mobile
matic in nature, showing a surface—treating ap
abrader which could be brought to the machinery
paratus of the type with which the operating head
or other object to be cleaned and there clean it
in place, but with the simultaneous collection of 25 of Fig. 1 may be used.
A brief description‘ of the surface-treating ap-'
all the abrasive particles and debris. This prob
paratus illustrated in Fig. 3 will be helpful in un
lem was solved in a general way by the appara
derstanding the principles of they improved oper
tus described in copending applications, Serial No.
ating head which is generally shown at It there
608,386, filed August 2, 1945 which matured as
Patent Number 2,455,514 on December 7, 1948, 30 in. An air compressor ll furnishes a stream of ‘
highly compressed air to the duct It. In a man
Serial No. 768,198, ?led August 12, 1947 now
ner fully described in the aforesaid application
abandoned, and Serial No. 778,378, filed October
Serial No. 608,386, which matured as Patent No.
7, 1947. However, the operating head (some
2,455,514 on December 7, 1948, the abrasive is fed
times described as a “gun”) of the unit described
in said applications, is not particularly well adapt 35 into this air-stream from a hopper 13 through a
valve 14, a conduit I5 then carrying this abra
ed for use with uneven or non-planar surfaces
sive-?lled air-stream to the operating head I‘.
such as those present on tire molds, for example.
where the abrasive particles impinge on the sur
‘ Further, in the unit described in said applica
face "5 to be cleaned. A powerful suction pump
tions, the mounting of the blast and suction lines
leading to the operating head is entirely sepa 40 2|] is also connected to the operating head l8
by a series of conduits through which the spent
rate, and for that reason manipulation of the
abrasive and any waste particles dislodged there
head is made relatively cumbersome; it would be
by are drawn back into the unit and are prevented
more convenient if a single connection could be
used in the vicinity of the head.
from passing outwardly of the head In into the
It is therefore an object of this invention to
atmosphere. Speci?cally, the waste and spent
provide an improved operating head for use with
abrasive are carried away from the head through
particles in the vicinity of the object being
‘ an abrader of the type which simultaneously
a conduit 2| to a reclaimer 22 (described in the
blast-impels and suction-removes the abrasive
co-pending application, Serial No. 778,378) where
with impinging air currents drawn in through
any re-usable abrasive material is separated from
the air pervious skirt.
50 the waste and passed into an upper hopper H
from which it is periodicallydischarged into the
Another object of this invention is to provide
an operating head of the foregoing variety which
main feed hopper l3. The waste is sucked out
from the reclaimer 22 through a conduit 241 into a
can be used in treating uneven, curved, or irregu
dust collecting bin 25.
lar surfaces, particularly those having small crev
Generally, this present invention comprises
ices, as the interior of tire molds.
2,494,778
operating head l0 which serves to direct against
concentrically arranged inside the brush 83
a surface IE to be cleaned the abrasive or other
treating material supplied by the unit described,
and also secured to the ?ange 32 is a ?exible
ba?le 65, preferably made from natural or syn
and which thereafter facilitates the withdrawal
of the abrasive and waste particles from the sur
face l6 and back into the unit before they can
ing, which may beseparate rings secured to
escape to the surrounding areas and go into the -
atmosphere.
This operating head comprises means to direct
a blast of abrasive against a surface and suction
means to remove the spent abrasive and the
waste matter from the surface. A brush en
circles the mouth of the head to provide an air
thetic rubber. The ba?le 35 preferably comprises
a series of stepped rings, as shown in the draw
gether or may be molded integrally as steps. Its
full thickness (or the total thickness of all the
rings) extends a short distance below the open
end 32; then it is radially o?’set successively at
66 and 61. The thin lowermost portion 58 of the
baiile 65 is shaped to provide air passage inlets,
such as the notches 10.
In operation, the abrasive is carried from the
into the suction current, which is stronger than 15 hose l5 by the air blast into the cap 40. From
there it passes through the nozzle 50, which im
the blast current. The brush also traps abrasive
pinges the abrasive against the surface Hi. The
and waste inside the head and serves to prevent
suction force being exerted is more powerful than
it from spilling outside, holding it until it can
the blasting force, so that air passes in through
be removed by the suction current. Concen
trically arranged inside the brush is an imper 20 the brush 63 and the passages or notches ‘Ill,
gathers up’the waste and the spent abrasive and
meable ?exible spacer ring having air-passage
carries it out around the nozzle 50 into the bore
notches cut around its lower end. As will be
permeable maze which permits outside air to pass
seen, this ?exible ring serves at once to space
34 from where it is carried into the suction hose
2|.
the nozzle ,housing from the surface being
cleaned, protect the brush, and limit the inward 25 The impermeable baiiie 65 above the notches
prevents the inward passage of air, and con?nes
passage of air to a thin, powerful stream.
the air to the concentrated current passing
The head Ill, shown in the drawings, is a pre
through the notches ‘I0. Moreover, the brush 63
ferred form of the invention, and it will now be
is protected from the wearing action of the abra
described in detail. Its metal housing 30 has
a straight-through vertical bore 3| open at both 30 sive by the ba?ie 65. Since the baille 65 is made
of flexible material, the head readily adapts itself
ends 32 and 33. An inclined side bore 34 com
to changes and irregularities in surfaces.
municates with the vertical bore 3| intermediate
What is claimed is:
these ends 32 and 33 and at its own outer end
1. In an operating head for a blast-impelling,
35 is detachably secured to the suction conduit
2|. Both bores 3| and 34 are lined with a layer 35 suction-removing, surface-treating apparatus,
said head including a hollow housing open at
36 of rubber, which is bonded, as by vulcaniza
tion, to the housing 30.
The lower end 32 of the housing 30 faces the
its lower end where it faces the work surface,
the bore of said housing also being in communi
cation with a suction line and having means
work surface I6 being cleaned. A hollow cap
40 slidesinto the upper end 33 of the housing 40 therein connected with a blast line and for di
recting said blast out through said lower end, the
and is secured there by set screws 4|. A fitting
combination therewith of a circular brush se
42 is threaded into the cap 40 through the open
cured around the lower end of said housing to
ing 43 adjacent its upper end. The other end of
provide a maze-like, air-permeable, impeding
the ?tting 42 is detachably connected with the
blast hose l5. To permit different connections 45 means and an inner impermeable member se
cured around said housing between said housing
of the ?tting 42 into the cap 40, additional open
and said brush, said member having air pas
ings 44 may be provided, with plugs 45 closing
sages through its lower periphery.
them when they are not in use.
2. The head claimed in claim 1 in which said
A nozzle 50, preferably made from a very hard
alloy, is threaded into the lower, interior end of 50 impermeable member is made from a resilient
material.
the cap 40, snugly abutting a washer 5| so as
3. The head claimed in claim 2 in which said
to provide a tight ?t. The nozzle 50 extends
impermeable member is thicker at its upper end
inside the bore 3| but stops short of the hous
than at its lower end, whereby it is more ?exi
ing's open end 32. At its upper end 52 the nozzle
‘
is funneled in toward a narrower neck portion 55 ble at its lower end.
4. The head claimed in claim 1 in which the
53. Below the neck 53 the nozzle mouth 54 is
bore of said housing is protected by an inner lin
?ared outwardly so as to spread out the current
of air and abrasive passing therethrough.
Slidably mounted around the lower end of the
ing of rubbery material bonded to said housing.
5. The head claimed in claim 1 in which the
housing 30 is a collar 60, having a set screw 6| 50 brush and the impermeable member are secured
to a collar which is slidable around said housing
to fix it in any desired position with respect to
for adjustment with respect thereto.
the housing, as in co-pending application, Serial
No. 28,858, ?led May 24, 1948 which matured as -
Patent No. 2,483,176 on September 27, 1949. The
coliar’s lower end is ?anged at 62, and secured 05
around the outer circumference of the ?ange's
bottom surface is a circular brush 63. The brush
63 may be made of pig or Nylon bristles or
other suitable materials.
WILLIAM H. LIEAD.
ANDREW C. BUCHAN.
No references cited.
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