IMPROVEMENTS IN MACHINERY OR APPARATUS FOR CRUSHING, GRINDING OR PULVERIZING AMALGAMATING OR MIXING, MINERAL, ANIMAL AND VEGETABLE SUB- AND PROVISIONAL SPECIFICATION
Year: 1883

page_text: LETTERS PATENT to William Henry Thompson of Devonshire Square,
Bishopsgate in the County of Middlesex for an Invention of IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR CRUSHING, GRINDING OR PULVERIZING
AMALGAMATING OR MIXING, MINERAL, ANIMAL AND VEGETABLE SUB-
AND
PROVISIONAL SPECIFICATION left by the said William Henry Thompson
at the Office of the Commissioners of Patents on the 15th December 1883.
WILLIAM HENRY THOMPSON of Devonshire Square, Bishopsgate in the County
of Middlesex. "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR CRUSHING
GRINDING OR PULVERIZING AND AMALGAMATING OR MIXING MINERAL, ANIMAL
AND VEGETABLE SUBSTANCES."
This Invention relates to improvements on an Invention for which Letters
Patent N° 4325 were granted to me dated November 8th 1876 the object of such
improvements being firstly to reduce the friction surfaces and substitute more
simple device or devices in place of the elaborate and defective method of gland
stuffing box or packing hitherto employed for the purpose of retaining and
preventing the pulverized substance from getting to the bearings which apparatus
in practice is found to work with a considerable amount of friction fretting out the
packing surfaces in such a manner as to admit of the gritty pulverized substance
working through and getting at the bearing surfaces resulting in their rapid
destruction.
In carrying my invention into practice the two sides of the mill are fitted with
screen frames carrying the screens for regulating the fineness of the pulverized
substance passing away from the mill, each of these screen frames is formed with a
central ring through which the main shaft of the mill passes, this ring is fitted
with a chamber of suitable form diminishing in size down to the aforesaid shaft
where it is fitted with a gland or stuffing box for packing the shaft. At the back
of this gland or stuffing box is an annular water space or chamber surrounding the
mill shaft with sufficient clearance and in such a manner as to form a circular jet

page_text: through which the feed water plays or flows on its way to supply the mill in the
process of wet grinding or pulverization.
For some purposes I dispense with the gland or stuffing box aforesaid using only
the annular chainber forming around the shaft a circular jet through which the
feed water is directed with sufficient force and in such a manner as to prevent the
outward wash or flow of the pulverized substance except through the screen or
other proper channel. When the mill is adapted to dry grinding or pulverization
instead of using water a current of air is employed acting in a similar manner with
the same object and for some purposes the air current is directed so as to partially
or entirely carry off the reduced or pulverized substance from the mill.
Another part of my Invention has for its object the adaptation of the mill to
the amalgamation or mixing of animal vegetable or mineral substances, by keeping
a given quantity of substance under the action of the crushing or pulverizing
ball.
In carrying this part of my Invention into practice the crushing, grinding or
pulverizing mechanism is constructed in a similar manner to that described in the
Specification of my Patent aforesaid, and the propelling blades are arranged in the
discs so as to draw the substances from the action of the ball into two chambers,
one of which is fitted on each side of the mill in such a manner as to admit of the
working of the main shaft, these chambers are formed with suitable channels
through which the substance drawn from the mill is returned to it and is kept in
circulation by the propellor until properly amalgamated or mixed when it is drawn
off through suitably formed openings or channels.
My present invention is also applicable to other classes of crushing, grinding or
pulverizing machinery or apparatus.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Henry Thompson in the Patent Office on the 14th June 1884.
WILLIAM HENRY THOMPSON of Devonshire Square, Bishopsgate, in the County
of Middlesex. "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR CRUSHING,
GRINDING OR PULVERIZING AND AMALGAMATING OR MIXING, MINERAL, ANIMAL
AND VEGETABLE SUBSTANCES
23
This Invention relates to improvements on an invention for which Letters Patent
No 4325 were granted to me dated November 8th 1876 the object of such
improvements being firstly to reduce the friction surfaces and substitute more
simple devices in place of the elaborate and defective method of gland stuffing box
or packing hitherto employed for the purpose of retaining and preventing the
pulverized substances from getting to the bearings and which apparatus in practice
is found to work with a considerable amount of friction fretting out the packing
surfaces in such a manner as to admit of the gritty pulverized substance working
through and getting at the bearing surfaces resulting in their rapid destruction.
In carrying my invention into practice the two sides of the mill are fitted with
screen frames carrying the screens for regulating the fineness of the pulverized
substance passing away from the mill, each of these screen frames is formed with a
central ring through which the main shaft of the mill passes, this ring is fitted
with a chamber of suitable form diminishing in size down to the aforesaid shaft
where it is fitted with a gland or stuffing box for packing the shaft. At the back
of this gland or stuffing box-is an annular water space or chamber surrounding
the mill shaft with sufficient clearance and in such a manner as to form a circular
jet through which the feed water plays or flows on its way to supply the mill in
the process of wet grinding or pulverization.
For some purposes I dispense with the gland or stuffing box aforesaid using only
the annular chamber forming around the shaft a circular jet through which the
feed water is directed with sufficient force and in such a manner as to prevent the
outward wash or flow of the pulverized substance except through the screen or
other proper channel.
When the mill is adapted to dry grinding or pulverization instead of using water
a current of air is employed acting in a similar manner with the same object and
for some purposes the air current is directed so as to partially or entirely carry off
the reduced or pulverized substance from the mill.
Another part of my invention has for its object the adaptation of the mill to the
amalgamation or mixing of animal vegetable or mineral substances by keeping a
given quantity of substance under the action of the crushing or pulverizing ball
In carrying this part of my invention into practice the crushing grinding or
pulverizing mechanism is constructed in a similar manner to that described in the
Specification of my patent aforesaid, and the propelling blades are arranged in the
discs so as to draw the substances from the action of the ball into two chambers,
one of which is fitted on each side of the mill in such a manner as to admit of the
working of the main shaft. these chambers are formed with suitable channels
through which the substance drawn from the mill is returned to it and is kept in
circulation by the propellor until properly amalgamated or mixed when it is drawn
off through suitably formed openings or channels.
My present invention is also applicable to other classes of crushing grinding-or
pulverizing machinery or apparatus.;

page_text: And in order that my said Invention may be more clearly understood and
readily carried into effect I will proceed aided by the accompanying Drawings more
fully to describe the same.
Figure 1 is a vertical section of parts of a crushing or pulverizing machine
showing the first part of my invention applied thereto and Figure 2 is a vertical
section showing the second part of my invention.
In all the Figures like parts are marked with similar letters of reference.
I will first describe Figure 1. a is the main shaft. b. b are wheels or discs
which act to drive or impel the hall c. and which are fitted to work with and
capable of rocking slightly on the clutches d. which latter are fitted upon the
square portion a¹ of the main shaft whilst nuts e are employed to keep the
clutches d. in their proper position, f. f. are screen frames for carrying the screens
for regulating the fineness of the pulp or pulverized substance passing away from
the mill as is well understood.
In the centre of each of these screen frames f. f. is a ring g through which the
main shaft a passes, this ring is fitted with a chamber g¹ of suitable form
diminishing in size down to the aforesaid shaft where it is fitted with a gland or
stuffing box h. for packing the shaft. At the back of this gland or stuffing box h is
an annular water space or chamber g₁ surrounding the shaft a with sufficient
clearance on one side so as to form a circular jet through which the feed water
plays or flows from the supply pipe i, on its way to supply the mill in the process
of wet grinding or pulverization. The water flows along in the directions shown by
the arrows and thereby keeps all the bearing surfaces free from grit and prevents
the latter from passing to the gland or stuffing box h.
For some purposes I dispense with the glands or stuffing boxes h aforesaid and
use only the annular chambers g² forming around the shaft a circular jet through
which the feed water is directed with sufficient force and in such a manner as to
prevent the outward wash or flow of the pulverized substances except through the
screen or other proper channel.
When the mill is adapted to dry grinding or pulverization instead of using water
a current of air is employed acting in a similar manner with the same object and
for some purposes the air current is directed as is well understood so as to partially
or entirely carry off the reduced or pulverized substances from the mill.
In the arrangement represented at Figure 2 the crushing grinding or pulverizing
mechanisin is constructed in a similar manner to that described in the specification
of my Patent aforesaid and the propelling blades j are arranged in the discs 80 as
to draw the substances from the action of the ball c. into two chambers k. k. one of
which is fitted on each side of the mill in such a manner as to admit of the working
of the main shaft a; these chambers k. k. are formed with suitable channels k¹
through which the substance drawn from the mill is returned to it through the
hopper and is kept in circulation by the propellors until properly amalgamated
or mixed when it is drawn off through suitably forined openings or channels m. m.
My present invention is also applicable to other classes of crushing grinding or
pulverizing and amalgamating machinery or apparatus.
Having thus described the nature of my said Invention and the mode in which
I carry the same into effect I would have it understood that what I claim is :-
First. The means of preventing the pulp or pulverized substances from getting
to the bearings substantially as herein shown and described with respect to
Figure 1, and

page_text: Second. The means of adapting crushing grinding or pulverizing mills to the
amalgamation or mixing of animal vegetable or mineral substances substantially as
herein shown and described with respect to Figure 2.
In witness whereof I the said William Henry Thompson have hereunto set my
band and seal this Fourteenth day of June in the year of our Lord One thousand
eight hundred and eighty four.
W, H. THOMPSON (L.S.)