Year: 1887

page_text: Date of Application, 18th Oct., 1887
Specification Accepted, 1st June, 1888
I, JEAN JULES HIGNETTE, of 162 Boulevard Voltaire, Paris, France, Engineer, do
hereby declare the nature of this invention, for which I have obtained a Patent in
France, bearing No. 186453 and dated 18th October 1887, and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
The present invention relates to improvements in centrifugal grinding mills for
grinding and pulverizing all substances and more particularly cereals.
The annexed drawing will enable the manner in which such improvements are
carried into effect to be readily understood.
Fig. 1 is a front elevation of the mill.
Fig. 2 a vertical section through the axis thereof, and Fig. 3 an enlarged view of
the bottom end of the lower axis and its bearing.
The machine consists of two vertical axes A, A', each carrying a disc B, B', of a
form partly flat and partly in the form of a truncated cone, such discs being of cast or
wrought iron, steel or other suitable material according to the substance to be
ground.
This form of discs ensures better work and more especially greater regularity in the
grinding or crushing, with a slower speed, and while preventing the escape of the
material.
On each of these discs are cast or secured series of round pins or studs C, C¹,
arranged in a circular manner; or segments with cuts to suit the substance to be
treated or pulverized may be employed instead of the pins or studs.
For grinding corn the pins are arranged in concentric rows on each disc, the
spaces between same varying according to the kind of corn to be ground.
The two shafts may revolve at the same or at different speeds, and in the same
or reverse directions, and their speeds may be varied according to the nature of
the material to be crushed or ground.
As the shafts may be driven at great speed I suspend the upper one on a conical
part D, and entirely abolish the pivot bearing at the lower end of such shaft.
This mode of suspension may be applied to all machines of a similar nature to that
described herein.

page_text: Pivots of ordinary construction frequently cause stoppages and loss of time for
attending to and replacing same when worn. I construct my pivotal bearing so
that such loss of time is avoided.
The pivot consists of a conical piece of steel E which is placed by hand in a recess
of corresponding form provided in the lower end of the shaft.
Further, the conical pivot has a screw threaded part E', and it will be understood
that to withdraw the pivot it suffices to screw a nut F thereon, which by binding
against the shaft will exert a pressure in the direction of the arrow and instantly
force the pivot out.
The toe step is composed of a piece of bronze G which is simply placed and
slides in the support H for same which is also of bronze.
To renew same, it is only necessary to drive it out by a rod introduced into the
hole I and lightly strike such rod.
Finally in order to rectify the wear of the conical part of the upper bearing and so
avoid the approach of the pins of the top and bottom discs, as well as to enable
the two plates to be adjusted as desired, I mount the toe step on an inclined plane J
forming a wedge, which can be moved by a screw K, so as to permit the bearing
and consequently the lower disc B' to be raised or lowered with ease.
The corn or other material to be ground or crushed is fed between the discs B, B1,
through the central tube L, the top of which is funnel shaped as shown and can be
closed by a plate L' to prevent the entrance of air when this is desired, and reduce
the power required to drive the apparatus.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved grinding mill constructed substantially as specified.
2. Suspending the upper shaft A by means of a conical part D, without any
support at its lower end.
:
3. Forining the discs B, B', partly flat and partly conical, so as to ensure better
work, and more especially greater regularity in the crushing or grinding, with a
slower speed, while preventing the escape of the material, substantially as specified.
4. The employment of a movable pivot applied to the bottom end of the lower shaft
in crushing and grinding apparatus, so as to diminish the delay necessary to replace
or repair such pivot, substantially as specified.
5. The employment of an inclined plane to regulate the approach of the crushing
or grinding surfaces, in apparatus of a similar nature to that described, substantially
as specified.
6. The method of feeding the corn or other material into the machine by means of
a tube the upper end of which is funnel shaped and can be closed to prevent the
entrance of air when this is desired, and which reduces the power required to drive
the apparatus, substantially as specified.
Dated this 8th day of March 1888