IMPROVEMENTS IN' MACHINERY FOR GRINDING INTO POWDER, STONE AND OTHER HARD SUBSTANCES
Year: 1884

page_text: I EDWARD GRIFFITH BREWER of 33 Chancery Lane in the County of Middlesex,
Fellow of the Institute of Patent Agents do hereby declare the nature of said
Invention for "IMPROVEMENTS IN' MACHINERY FOR GRINDING INTO POWDER, STONE
AND OTHER HARD SUBSTANCES" (A communication to me from abroad by Messrs
J. Magdelaine & Cie of 86 Rue Royale Brussels Belgium Manufacturers) and in
what manner the same is to be performed in and by the following statement :—
The object of this invention is to obtain with the same pair of mill stones the
complete grinding of the hardest materials as flints for example and to whatever
degree of fineness of the products to be obtained.
The coupling together of a number of grindstones is avoided which is the cause
of a considerable outlay in capital and motive power or in the case of small
productions by the employment of discs having small frictional rubbing surfaces
necessitating long intermittent rest of the material during its grinding. Notice
need hardly be taken of the machines where the grindstones are fed at their
circumference the whole of the 24 hours and in rectangular troughs without
central feed.
By this repetition process without limit according to the infinitesimal divisibility
of the grains the machine the subject of this invention works equally well during
a lengthened period but without stopping and in a continuous and rapid manner
for by means of the automatic transverse feeder about to be described the material
is always kept in contact with the whole of the surface of the grindstones although
this apparatus allows them to be fed by the central opening for the grindstone
shaft,
The invention will be best understood by reference to the accompanying
drawings Figure 1 is a view in plan of a machine for grinding stone and
other hard substances constructed according to this invention, Figure 2 is a front
view of same, Figure 3 is a detached view of the arrangement of the transverse
feeder or distributor marked D at the entrance of the distributing pipe C.
ru 217

page_text: The distributing or transverse feeding apparatus is composed of an iron axis A
provided with two driving pulleys driven by the shaft of the millstone so as to
impart to it a speed of about 25 revolutions a minute. This axis is carried by two
cross bar frames B B in journals; on one of the ends of this shaft is fitted by a
ring or sleeve coupling a truncated tube C leading from the circumference of the
grindstone to the opening for the grindstone shaft.
At the beginning of this truncated tube are arranged the collecting or feeding
pipes D D D D the number of which may be varied at will being bent into the
shape of a long circle and coupled in pairs in the direction of their axes the ends
of these pipes are enlarged or shaped into feeding funnels.
1
The horizontal clutch G of the driving pulleys of the transverse feeder is
prolonged towards the upper stone and above that in the form of a jointed rod by
making an elbow allowing space for the rotation of the feeding or collecting
pipes D D and terminating in an eye to connect it with the end of the collar of
the plate below the supply pipe I and united to it by a pivot in order that the 1
structure may at any time support the operation of this pipe. The movement of
this plate permits or obstructs according to circumstances the entry of the raw
material between the stones.
The jointing mechanism is very important for the good working of the successive
operations to be produced for by making secure the working of the distributing
and the transverse feed apparatus, all error and delay are avoided in the working
which if not correct might cause grent disarrangements in the whole system.
As in the manufacture of silex white liquid material is always employed the
coupling of the two grindstones is surrounded by a circular canal or passage K
communicating on one side with a vat L the bottom is round in which the feeding 2
or collecting pipes D D work by means of a scraper firmly cemented to a suitable
part of the circumference of the running stone, the material is thrown from the
passage K into the vat L the level of the bottom of which is lower than that of
the passage.
The limit N (curved) of the inclined plane which brings these two bottoms:
together is arranged so that the scraper while passing this spot no longer rubs the
surface and thus leaves the material which it draws with it in its movement.
The water necessary for this manufacture is brought to the upper part of
the coupling box O by a pipe P terminating in a rose and provided with a
valve R communicating with that of the catch action of the transverse feeder or
distributor.
The other parts shown on the drawings are identical with those of ordinary
grindstones for grinding and require no further description here.

page_text: the time arrives when the degree of fineness has been obtained; during the last
turns of the transverse feeder or distributor the valve or vane communicating
between the vat L and the canal K is closed and the vat is allowed to empty and
at this moment the transverse feeder or distributor apparatus is thrown out of
gear care being taken to open at the same time the discharge passage Q of the
circular canal K which allows the scraper to collect there all the material gathered
by it into a decanting receiver movable when required.
The canal being quickly emptied by the scraper M the discharge passage Qis
immediately closed the disengaging mechanism of the transverse feeder or
distributor having caused the covering plate to pivot thereby closing the supply
tube I the supply of the grindstones then continues without sensible intermittance
and without nevertheless allowing the intimate mixture of the finished material
with that which commences to be worked for the first time again for during the
passage of the latter between the grindstones the scraper has had the time
required to break through or clear completely the circular canal K. into the
decanting receiver.
The operation of the communication apparatus Q may be effected automatically
by articulated lever gear connecting to the disengaging gear.
When the circular canal K is freshly filled the transverse feeder or distributor is
again put out of gear and the operation is re-commenced as before described-then
a third operation takes place and so on.
The Inventor reserves to himself the right to change at will the parts of
the apparatus the curves of the tubes of the transverse feeding or distributor and
80 forth while always preserving the principle of the repetition work with
grindstones even when fed by the shaft opening.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The system of transverse feeder or distributor for grindstones as described and
consisting of four or more evolutes of circles in form of pipes serving to bring by
their rotation the material which they collect by revolving towards their axis that
is to their bifurcation terminating in a distributing pipe as described and showu in
the drawings.
T:
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