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Патент USA US2408947

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hCOltlPOSlTIONS,
COALING Oi?i ELASTIC m
atente
CROSS time "
ct. 8, 1946
-‘
Examleer
‘ ,smrs mm T’ ' Omar“; "
- 2,408,946, -
'
, POLISHING WHEEL AND CEMENT. ' '
THEREFOR
_
‘I
HaroldR. Nelson, Detroit, Mich.
No Drawing. Application July 17, 1944', "
Serial No. 545,399
5 Claims‘. (01. 51-30’
.
The present invention pertains to a novel pol
insofar as the invention is concerned, is the
ishing wheel and cement therefor. Polishing or
silica and alumina content.
buiilng wheels composed of a body of vegetable
In relation to the aforementioned ingredients,
or animal ?brous material, such as felt, cotton,
the
asbestos varies from 2.5% to about 6%.
leather or sheepskin, are known in the art. It 5 Water
may be added until the desired consistency
is also customary to secure abrasive grains to
‘ or the purpose at hand is obtained. Likewise,
the surface of such a wheel by means of an
the clay or a mixture of different clays may be
adhesive.
selected for special requirements, although those
One of the di?iculties encountered in the use
mentioned above are generally satisfactory.
of such a wheel is softening of the adhesive by 10
In preparing the composition, the ingredients
the heat developed in use, with the result that
are charged into a vessel and heated, with stir
the abrasive coating deteriorates. More spe
ring, until a uniform consistency has been pro
ci?cally, the abrasive grains become buried in the
duced.
adhesive or, in other words, the working surface
In coating the wheel, the surface of the body
becomes glazed and hence worthless for its in
to be employed for polishing or buf?ng is ?rst
tended purpose.
coated with the adhesive. The adhesive grains
The principal object of the invention is to overare then applied either by sprinkling, laying the
come this dii‘?culty and thereby prolong the use
coated surface against a mass of abrasive grains
ful life of the wheel. This object is accomplished
or, if the periphery is to be treated, rolling the
by the use of an adhesive that is substantially 20 wheel over a mass of grains. After the adhesive
more resistant to heat than adhesives previously
has dried, the wheel is ready for use.
used in this art.
A wheel made up in this manner has a con
Inasmuch as other cements become brittle
siderably longer life than prior wheels having
when their heat resistance is increased by modi
abrasive grains cemented to a ?brous body. In
?cation of the ingredients, and brittleness is 25 fact, such a wheel can be subjected to a pres
highly undesirable in a polishing wheel, another
sure enabling it to cut through a thickness of '
object of the invention is to provide a cement
metal, without deterioration of the abrasive coat
that has high resistance to heat without sacri
ing except by frictional wear. Under normal
?cing its pliability. This desirable combination
operating conditions, and even under extreme
of properties is brought about by a particular se 30
conditions as described, there is no softening of
lection of ingredients as hereinafter set forth.
the adhesive nor glazing of the wheel. The abra
The novel adhesive is characterized by the use
sive surface is useful until the abrasive grains
of a relatively small amount of ?nely ground
are worn down.
asbestos incorporated in a combination of clays
The wheel remains pliable and does not become
and other materials.
chipped in operation. Thus, the life of a given
V l//_\ A typical and satisfactory adhesive is com
posed as follows:
Parts by weight
Silicate of soda _________________________ __ 834
coating is prolonged and, in addition, the wheel
body or head is less rapidly worn away and is
available_ for more re-coatings than if subject
t° chippmg-
.
.
Hanover clay
___
Brunswick clay _________________________ __
26 40
The invention is not limited to the foregoing
26
formula which has been given only as an il
Other clay _____________________________ __
43
lustration.
Various modi?cations are feasible in
Aluminum silicate ______________________ __ 20
the selection of grades of material and the ad
Finely ground asbestos____________ __ 25 to 60
dition of special ingredients with regard to spe
‘__
45 ci?c requirements. The invention is character
The chemical composition of Hanover clay
and Brunswick clay is as follows:
___-‘5
'
/
-
by the appended claims.
It will also be understood that the invention
Hii‘é‘iefli‘tiiyck 50 is not restricted to the precise materials disclosed
. »~
..
'
ized by the presence of a relatively small quan
tity of asbestos and in other respects as indicated
.
MW»)
Percent
Per cent
sum’ 810’ """""""""""""" "
333
herein and that the appended claims are intended
to embody the legal range of equivalents.
Having thus fully described my invention, what
Noolllg
I claim and secure by Letters Patent is:
1110 55
1. A polishing member comprising a fibrous
110
01'7
I
0109
body, abrasive particles adhered thereto, the ad
hesive for said particles containing 21/2% to 6%
9-1
13-75
of ?nely ground asbestos and about 10% of clay
The important characteristics of these clays, 60 in relation to the solid content.
2. A polishing member comprising a ?brous
2,408,946
3
body, abrasive particles adhered thereto, the ad-‘
hesive for said particles containing approxi
mately, by weight, 834 parts of sodium silicate,
100 parts of clay and 25-60 parts of ?nely ground
asbestos ?ber.
3. A polishing member comprising a ?brous
4
mately, by weight, 850 parts of silicates, the major
portion of which is sodium silicate, 26 parts
Hanover clay,'26 parts Brunswick clay, 48 parts
of other clay, and 25 to 60 parts of ?nely ground
asbestos ?ber.
5. A polishing member comprising a ?brous
body, abrasive particles adhered thereto, the
body, abrasive particles adhered thereto, the ad
adhesive for said particles containing approxi
hesive Ior said particles containing approxi
mately, by weight, 834 parts of sodium silicate,
mately, by weight, 834 parts of sodium silicate,
20 parts of aluminum silicate, 100 parts of clay, 10 20 parts of aluminum silicate, 100 parts of clay,
and 25 to 60 parts of ?nely ground asbestos ?ber,
and 25 parts to 60 parts of ?nely ground asbestos
26 parts Hanover clay, 26 parts Brunswick clay,
?ber.
48 parts other clay, and 25 to 60 parts of ?nely
4. A polishing member comprising a ?brous
ground asbestos ?ber.
body, abrasive particles adhered thereto, the ad
HAROLD R. NELSON.
hesive for said particles containing approxi 15
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