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Патент USA US2109086

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Feb. 22, 1938.
Filed May 15, 1936
///L A m: P. C‘OUSSE’MEN 7'
FL oe/s 6419,0577: -
Patented Feb. 22, 1938
Hilaire P. Coussement and Floris Cappette,
Roubaix, France
Application May 15, 1936, Serial No. 79,974
In France May 17, 1935
2 Claims.
The present invention has for its object the
provision of an improved grinding instrument
(CI. 32-59)
tion of the grinding apparatus, materials al
for use in dental work, and is characterized by
its composition and by the provision of a novel
5 mounting device.
There have hitherto been used for dental work
and in the making of dentures, grinding discs
of various shapes and sizes, but these grinding
discs have usually been made of hard material
10 and have proved unsuitable in that they at
tacked the enamel of the teeth and on the least
contact therewith they destroyed this enamel
and consequently considerably diminished the
resistance of the teeth.
There have also been used supports upon which
were arranged caps made of glass paper but such
supports served only for polishing and it was im
possible, on account of their delicate structure,
to use them for roughing and ?nishing work.
According to the present invention, a grind
ing instrument is formed of a special composi
tion and of any desired shape, the composition
of which is such that the material which con
stitutes this instrument is not as hard as the
enamel of the teeth which it cannot consequent
ly attack whilst the said material is harder than
the usual products such asz-hardened rubber,
ebonite, synthetic resin or other similar mate
rials used in the construction of dentures, and
which permits the working of these materials
easily without risking in any way damage to the
enamel of the teeth.
The annexed drawing shows diagrammatical
ly by way of example, one particular embodi
' ment of the grinding instrument having the char
acteristics of the invention, in whichz-Fig. 1
is a. sectional view of a grinding instrument on
its support, Fig. 2 illustrates one constructional
form of the support and Fig. 3 illustrates a mount
?tted on a milling spindle.
One method of producing a grinding instru
ment according to the invention is as follows:—
There is used for its manufacture crushed and
pounded glass, reduced to sufficiently ?ne di
mensions. The degree to which the glass may be
powdered depends on the type of grinding wheel
required for example, ?nishing or roughing grind
ing wheels, having ?ner or coarser grains respec
The binder may be any binding agent well
known in the manufacture of grinding wheels,
provided that the hardness of the binder used is
less than that of the glass. For example, there
may be chosen sodium silicate and there may be
55 added thereto, in order to facilitate the forma
ready known in the manufacture of foundry
cores, such as gumlac or the like, so that the
grinding apparatus may have, even before bak
ing, a certain consistency.
There may also be provided the addition of
colours to the mixture so as to permit the rapid
differentiation of grinding apparatus of differ
ent granular structure.
The plastic mixture is moulded in known man~ 10
ner on the supports of the grinding apparatus
and is then baked in a stove at a suitable tem
The grinding parts come out perfectly hard,
well shaped and ready for use.
One particular form of grinding block is illus
trated in Fig. 1, and consists of a cylindrical
body terminating in a slightly conical portion.
This grinding block is mounted on a support
which is constituted by a part having on the 20
outside a thread similar to that employed for wood
screws. Alternatively circular grooves may be
provided to enable the ?xing of the grinding
block on the support.
The interior of the block is formed as a conical
hole having threads or grooves similar to those
on the support for the purpose of mounting the
grinding block on the spindles.
The supporting piece is preferably made of
soft metal, such, for example, as an alloy of lead
and antimony, similar to that of printing char
acters, or in a white alloy of the same nature.
Illustrated in Figure 3 is a mount ?tted on a
milling spindle as generally used by dental sur
This mount is formed of a cylindrical portion
identical with that at the extremity of the mill
ing instruments and on this cylindrical end is
?xed by any known means, for example, by sol
dering, a conical screw made of hard material
such as, for example, steel, the angle of which
screw at the top is the same as that of the in
ner cone of the grinding block supports. This
part is screwed within the grinding block sup
port, which is formed of softer material, in the
direction of rotation of the milling spindle, with
the result that a ?rm arrangement due to the
well known clamping properties of an extended
cone within a cone is obtained.
The grinding block is removed in exactly the
same manner as a. milling tool.
Several grind
ing blocks having different shapes or grain as
desired, may be provided and each may be mounte
ed by its ?xing pin on to the milling spindle.
The invention permits of working rapidly on 55
the materials which constitute the dentures of
even of carrying out certain dental surgical op
erations Without risk of injuring the enamel.
Naturally the shapes of the grinding blocks,
their colour, the details of execution and mould
ing and the methods of utilization may vary With
out departing from the scope of the present in
We claim:_
1. In a grinding tool, a heat-baked head in
cluding a, metallic support and comprised of a
mixture of comminuted glass, sodium silicate
binder, and a temporary gum-lac binder carbon
ized during the baking of the head, said charred
15 mass being uniformly distributed in the head to
lower the resistance of the baked binderv
2. A milling tool of the character described,
comprising a support of relatively soft metal of
conical shape and provided with an‘ exterior
threadv of variable pitch, said support having a
smooth conical aperture for mounting on a spin
dle, and a head integrally mounted over said sup
port, said head being constituted of a comininuted
glass aggregated with a baked. silicate binder
through which are uniformly distributed car
bon particles originally of an organic nature and 10’
serving as a temporary bond for head-shaping
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