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Патент USA US2131449

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Patented Sept 21, 1938 _
~ 2,131,449
mantis -
momsncrousnnvc war-m1.
Clotaire Mary, Paris, France
Application May :0, 1037, ‘Serial No.- ua'ioa In France May 20, me
7 The invention has for its object improvements
in pneumatic polishing wheels. ‘ ..
Claim. - (cl. 51-192) ’
by means of bolts b and of inner circles b1 to side
"cheeks c, which are fixed on the other hand to
As is known, there already exist polishing _' ' the hub c by means of bolts e with the interposi-a ,.
_tion of plastic joints 1, and ‘which are of such
. wheels comprising a pneumatic drum surround
edat its peripheryfby an abrasive annular band, ‘diameter that~ their edge only extends 'to some ‘R
the in?ation of the inner_drum determining the distance from the outer peripheral surface of the
manner‘of working on the work piece. But said -‘ resilient part a so that it can‘ never,v beat on the
drums generally have two lateral metal annular
A valve such as g-mounted in one of the cheeks
parts which retain the medial rubber. portion
10 which is itself of relatively small thickness, so c,~permits of the in?ation of the annularspace I.
, that‘duri'ng operation there is a deformation of between the hub d, the cheek c and the resilient
the medial peripheral band and ‘the apparatus part a. ‘An inner tube can ‘be. provided inside the
can only be used in practice for working parts‘v drum to ensure, a better sealing. The pneumatic . work
' of rounded or convex shape and cannot serve for ‘ chamber can be made in one piece, the resilient '
II15 working on plain surfacesand, a fortiori on con- } part a. being in form of ‘closed to‘rus. _
The improvements Swhich'are the object of the
nular abrasive‘ band It consisting of paper or‘of '
invention aim at enabling pneumatic wheels 'of
this kind to, be used for all polishing work on
fabric carrying'on theoutsidethe- abrasive mate-'
flat, or even concave surfaces. For this purpose,
the resilient or rubber part of the drum forms
' both the medial part. and the two annular side
before its in?ation, and when the in?ation has
parts of the pneumatic drum, the metal side
hoops which serve for holding said resilient‘part
When ‘the in?ation of the drumis slight and
25 only extending to some distance from the outer
. Around the resilient part a. is placed‘the an- '
rial. Said abrasive band is mounted on the drum .
been‘effected it isvheld in position by said in
consequently they abrasive band remains ?at, the
wheel can operate perfectly ?at;,it can even come . 26
periphery-and‘ consequently 'do not. hinder the
somewhat ?attened on the operative portion and ,
work over the whole width of the latter. On the
expand over the latter.
Owing‘to the setting back of the cheek c rela
other hand,‘ the resilient part is made'of relative
ly thick rubber, only permitting a slight defor
tively to the outer surface of the resilient part a_
mation of the working'suri'ace. It is the inner ‘and of the abrasive band, said cheeks caninever 30"
pressure of in?ation which determines the hold ' bear on-the work piece, thereby enabling the drum
a ing and if desired the deformation of the abra
sive band, which in this case has the whole width
of the drum.
to be used overthe whole of its .wi'dth. . '
' The inner pressure or air of the drum. com-.
blned with' the mechanical application pressure,
of the wheel on ‘the work piece, will be suitably 35
determined according to the work to be eii’ected
and the nature of the material to be polished.
In its construction, the rubber part forming
the resilient drum advantageously comprises .a
central thick portion preferably made of pure
gum and two more rigid lateral rubber portions. , The wheehthus‘ constructed can be used, either
for example made of rubber coated fabric, so ‘on machines having ?xed frames, or on portable
4.0 as to ensure the correct maintenance of the an hand machines, or on rolling machines for polish
nular shape of the, drum, while permitting a cer
ing ?at surfaces‘ of - all kinds, made of metal, of
tain expansion and a relative flexibility of the‘ wood, of marble, .of natural or arti?cial stones,
medial portion. . _
etc., or for polishing concave -surfaces,-or mountg
35 -'
The accompanying drawing illustrates, by way . ed at the end of a ?exible transmission, or on a
45 of example, one embodiment .of the ‘improved polishing head, etc.
- '
pneumatic polishing wheel device which is the . Abrasive annular bands having slightly differ-
object of the invention. The single figure of said
~ drawing is the vertical section of said wheel.
As seen in said drawing, the device comprises
50 an annular rubber part a, of which the central
ent diameters‘ can advantageously be used ‘withv
said wheel. with a reduced in?ation the small
est diameter- of band‘ will be used and said band
as well as the wheel can expand over the-surface
portion a1 is relatively thick and made of pure ' to be worked. By using an abrasive band of
gum for example, whereas the-two side portions greater diameter, it will be possible,'by consider
a? are 'of more rigidrubber and are formed for
ably in?ating the drum, to cause a certain vbulg- ,
example, by we. plurality of thicknesses of rubber
coated fabric. Said part a is fixed on either ‘side
ing of its outer surface and to thus operate with
the middle of said surface.
' 2,181,449
The changing of the abrasive.
is very described and illustrated above and that it is
easily elected by de?ation‘, then by in?ation or ' capable of any modi?cations.
the drum.
What I claim and desire to secure by Letters
said pneumatic grinding wheel has a large Patent 0! the United States is:
number oi’ advantages amongst which the follow
A pneumatic polishing wheel, comprising an
ing may be cited:
annular drum having a comparatively thick and
1. smoothness in the contacting of the wheel elastic central portion consisting of gum and ex
with the part to be polished, thereby enabling the tending over the entire width of the wheel, and
wheel to be applied in theportable form, on a side portions situated at both sides of said central
10 metal sheet or part without‘fear of deterioration. portion, said side portions consisting of rubber 10»
2. Possibility, with a single wheel, of using coated fabrics and being less thick and less
polishing bands made of abrasive fabric oi’ all
elastic than said central portion, an annular
kinds of grain, from the‘ ‘coarsest for trimming, to
the ?nest for polishing, and ‘of changing said
band in a few moments, .and the possibility like
wise oi! using polishing bands made of bull‘ leather
which the user himself can cover or not, with
abrasive band covering said central portion, two
metallic side cheeks situated at a distance one
from the other‘v and having annular outer end
portions and inner end portions, the diameters of
abrasive material.
smaller than the diameter of said central portion,
said outer end portions being substantially
3. Possibility of using the wheel with slight - means connecting the side portions of said drum
in?ation so as to polish all more or less deformed - with the outer end portions of said side cheeks, a 20
parts, oi’ a metal sheet, of a ?oor, of a mould
board of a plough, etc.', or with a greater in?ation
so as to bulge the operative surface and thus
work on the middle of the latter.
It is obvious that the invention is not limited
to the constructional details which have been
rotary shaft connected],with the inner end por
tions of said side cheeks, and means carried by
one of the side cheeks for supplying air under
pressure into the space between ‘said side ‘cheeks
and said drum.
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