IMPROVEMENTS IN MACHINERY FOR THE REDUCTION OF TIN STUFF AND OTHER PARTIALLY PULVERIZED ORES TO EXTRACT THE METAL THEREFROM AS WELL AS FOR GRINDING PAINT, CEMENT AND OTHER HARD SUB- STANCES to be as follows:
Year: 1885

page_text: We SAMUEL HENRY STEPHENS and STEPHEN RODDA both of Bridge in the
Parish of Illogan in the County of Cornwall Tin Dressers do hereby declare the
nature of said invention for "IMPROVEMENTS IN MACHINERY FOR THE REDUCTION
OF TIN STUFF AND OTHER PARTIALLY PULVERIZED ORES TO EXTRACT THE METAL
THEREFROM AS WELL AS FOR GRINDING PAINT, CEMENT AND OTHER HARD SUB-
STANCES to be as follows:-'
"
According to our invention. we employ a trough like bed fixed and set at an
incline, its surface being composed of three different divisions or series of surfaces
which may however be cast in one piece that in the centre being formed with
rectangular or oblong recesses or troughs at right angles to the sloping of the bed
and holes or perforations alternately to one another; and on each side of this
central surface and to the surface right and left of same we provide other oblong
slots or recesses set diagonally to the central surface. The shoe or working rubbing
surface or surfaces is or are sufficiently wide to cover the whole width of the bed
that is the three surfaces aforesaid, and the shoe is made with an angular front but
of less an angle than the parallel oblong recesses or slots. There are a series of
shoes say for example three connected together by bolts on a connection bar, or the
bar may be formed with tenons which may be slid into mortise slots in the shoes.
This bar is connected to and driven and receives a reciprocating motion from a
connecting rod from a crank shaft or crank disc the throw of which must be
regulated according to the situation and the stuff to be treated or reduced. The
angular front edge of the shoe is inclined inwards from its upper towards its lower
or rubbing face so that during its reciprocating motion this inward inclination of
r.

page_text: its foremost or upper edge will collect or carry with it a sufficient supply of the
stuff which is being operated upon.
An additional plate or mouthpiece may be fixed on the front edge of the upper
face of the shoes such plate or mouthpiece projecting over the angular front edge
of the shoe thus aiding in the accumulation of material and also the material is
prevented from overflowing and escaping the action of the shoes or rubbers. The
front angular edge of each shoe is at both sides provided with a side piece to catch
the material and to retain the same within the inward inclination or mouthpiece
of the shoe.

page_text: We SAMUEL HENRY STEPHENS and STEPHEN RODDA, both of Illogan, Cornwall
Tin Stream, Workers, do hereby declare the nature of our invention for REDUCING
TIN STUFF AND OTHER PARTIALLY PULVERIZED ORES &c and in what manner, the
same is to be performed, to be particularly described and ascertained in and by
the following statement :-
Our invention refers firstly to an inclined rubbing bed fixed to any convenient
incline. Secondly. To an improved form of shoes or rubbers.
According to the first part of our invention we form the inclined rubbing bed
into three divisions. The centre division with parallel oblong troughs and round
holes or perforations alternately. The two side or right and left. divisions also
with parallel oblong. troughs, but placed at any convenient angle to the side of
rubbing bed and also to the oblong troughs in the centre division of the said
rubbing bed.
According to the second part of our invention we form the shoes or rubbers of
three divisions. The two side or right and left divisions shall have their respective
sides nearest the central division cut off so as to form their fronts of an angle-
with the front of the central division, that shall be found most practicable for the
better gathering the material under treatment, between the rubbing surfaces of
shoes or rubbers and the rubbing bed. The front of each division of the shoes or
rubbers will have a further bevil or angle looking inwards from the top part of
shoes or rubbers as shewn in section.
In order to more fully describe and illustrate the manner in which we carry our
invention into effect we will now proceed to further describe the same with reference
to the accompany drawings.
Figure 1. is a plan of an ore pulverizer constructed according to our invention
for reducing Tin Stuff and other partially pulverized ores and for other grinding
purposes.
B. B. are the shoes or rubbers which will be connected by means of bolts to an
iron strap C. of a sufficient length to take as many shoes or rubbers as will be
found most convenient for grinding the material under treatment. The end of the
iron strap C. will be further connected to a rod driven from a crank or disc wheel
of a size that will give the shoes or rubbers B. B. a forward and backward motion
on the surface of the rubbing bed A. that shall meet the requirements of the place
for fixing the machine and also the stuff to be ground.
Figure 2. is a plan of a rubbing bed shewing the oblong troughs in the three
divisions and
Figures 7 and 8. is the longitudinal and cross sections of the bed,

page_text: Figure 4. is a section of shoes or rubbers shewing the bevil of fronts of the
divisions.
Figure 5. is a section of shoes or rubbers.
Figure 6. is a side elevation of the machine.
The general operation of the machine is as follows. The material to be ground
and pulverized is fed to the machine on the top of the inclined bed by the
launder D. While the material is being fed by the launder D. the crank or disc
wheel driven by water or other power gives a forward and backward motion to
the rod and strap C. thus communicating the same motion to the shoes or rubbers
along the surface of the rubbing bed A. The material is thus thoroughly
pulverized between the shoes or rubbers B. B. and the surface of the rubbing bed A.
The supply of water and material is maintained by the launder D. and con-
sequently the ground and powdered material mixed with water passes from the
bottom of the inclined rubbing bed to any receptacle for further treatment as may
be required.
The great advantage we find from making the oblong troughs in the two side
divisions at an angle with side of rubbing bed is that they conduct the material
under treatment always towards the centre of the rubbing bed theroby enabling
the shoes or rubbers the better to catch their grip or hold.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the samo is to be performed we declare that what
we claim is
:
First. An inclined rubbing bed-substantially as described and with reference
to Figure 2. of the accompany drawings.
Second. An improved form of shoes or rubbers substantially as and for the
purpose sot forth and particularly with reference to Figures 3. 4. and 5.