Improvements in Grinding Mills.
Year: 1893

page_text: Date of Application, 29th June, 1893-Accepted, 5th Aug., 1893
VVI M DI MULTIATION.
Improvements in Grinding Mills.
I, SIDDI SCHWARZENBERGER, of 35, Bahuhofstrasse Zittau, Saxony,
Merchant, do hereby declare the nature of this invention and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement :-
My invention relates to grinding mills chiefly of the smaller type, such for
example as are used domestically for grinding coffee, pepper and such like
substances.
Heretofore the usual mode of driving such mills has been by means of a crank
on the vertical shaft of the grinding cone or by means of a crank on a horizontal
shaft in combination with a pair of bevel wheels; these modes present certain
inconveniences in use and furthermore the comminution of the material to be
ground which is poured into the grinding hopper takes up too much time.
The object of the present improvement is to remedy the inconveniences hitherto
experienced in domestic grinding mills and so supply a pressing want.
The invention is illustrated in the accompanying drawing in which Fig. 1 is a
cross section of a hand-operated coffee-mill provided with the improvements.
Fig. 2 is a cross-section, partly in elevation, of a similar grinding apparatus for
power driving.
The grinding cone A is arranged in the stationary surrounding envelope or
grinding stone H and fixed to the spindle B which is rotatably mounted in the bent
shoe piece C, and provided at its upper part with a quick screwthread B¹
similarly to the driving spindle of an Archimedean drill. D is a nut embracing
the screw-threaded portion B' of the spindle B and it is fixed to the tube E which
is furnished at its upper end with the operating knob F. It is capable of vertical
reciprocating motion and is guided in the stirrup piece M. If vertical pressure is
exerted on knob F the nut D causes the spindle B and with it the grinding cone A
to rotate in the direction of the arrow. A spiral spring G is applied to the
spindle B and after compression by the descent of the nut D it returns the said nut
and tube E automatically, thereby causing the spindle B and the grinding cone A
to rotate in the opposite direction.
Further according to my invention, in grinding mills with a rotary cone and
envelope I fix a funnel-shaped hopper N to the grinding cone A. so as to rotate
with same and it is provided on its outer side with a suitably roughened surface
or coating n and to the stationary envelope H or grinding stone I fix a similar
funnel which is furnished on its inner side with a roughened surface or
lining i.
The material to be ground is fed into the space K between the two funnels N
and I, and undergoes in this space a preparatory grinding by reason of the said
rotation of the inner funnel. The roughened surfaces of the two funnels are or
may be also provided with left-handed and right-handed cuts or grooves, in order
that the preparatory grinding of the material to be comminuted may take place
both during the right handed and the left-handed rotations of the funnel N. A
mill of this kind may also be readily arranged for power driving. Fig. 2 shows
by way of example an arrangement of this kind in which the tube E together
with its nut is connected by the connecting rod R to the crank R' upon a rotary
shaft R which therefore transmits rotary motion to the grinding apparatus.
The improvements hereinbefore described may be applied to all grinding or
comminuting machines which act on the principle of the coffee mill illustrated."

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In grinding mills in which the reduction of the material to be ground is
effected by a grinding cone and an envelope surrounding the latter, a device for
driving the grinding cone A consisting of a rotary spindle B fixed to the grinding
cone and provided with quick screwthread B₁ passing through a nut D adapted
for vertical reciprocating motion by hand or by mechanical means (such as power,
spring or equivalent) so as to rotate the cone A substantially as described and
illustrated.
2. In grinding mills with a grinding cone and envelope, the arrangement of a
funnel-shaped part N fixed to the grinding cone A and formed with a roughened
outer surface within a stationary funnel which is formed with a roughened inner
surface, for the purpose of effecting a preparatory or preliminary grinding or
reduction of the material to be ground, the said two roughened surfaces being
furnished if desired with both right-handed and left-handed cuts or grooves for
the purpose of enabling the material to be ground to be preliminarily reduced
during rotation of the funnel N in either direction substantially as set forth.
Jated 2019 29th day at luna
1803
Wated this 29th day of June
XUR
For the Applicant,
J. C. CHAPMAN, C.P.A.,
70, Chancery Lane, London, W.C., Filing Agent.