An Improvement in appliances for Dressing Tin-ores and the like.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
An Improvement in appliances for Dressing Tin-ores and the like.
JOSEPH COAD, Tin Streamer, 61, Roskear Row, Camborne, Cornwall, JOHN
EUSTICE, Lecturer in Engineering, 26, Wilton Avenue, Southampton, do hereby
declare the nature of this invention to be as follows:-
In the frame usually employed in tin-dressing, water carrying the powdered ore
and gangue-stuff is distributed at the top of an inclined bed of smooth boarding,
the heavy minerals remain on the inclined bed of the frame, the lighter materials
being carried by the flowing water to a waste-channel at the bottom of the inclined
bed.
Whilst the mineral is being collected on the frame-bed, clear water is allowed to
accumulate in a hinged "launder" placed across the top part of the frame, the
mineral collected is by the sudden liberation of the accumulated clear water,
periodically washed into a launder or channel at the bottom of the frame, this
launder is separate from the waste channel; a flap which is raised simultaneously
with the liberation of the washing-down water provides for the division of the
waste material and the tin-stuff.
The invention consists of an arrangement for supplying to the beds or tables of
the frames, during definite periods:
1st. A quantity of water carrying the mineral.
2nd. A quantity of clean water to wash the collected mineral.
3rd. An arrangement of cams, and levers (or detents) to permit of the sudden
liberation of the water for washing off the mineral which has accumulated on the
bed of the frame.
In carrying out the invention, water containing the mineral is led into one
compartment of a rotating distributor, and at the same time the clear water from
a separate channel or pipe is led into another compartment of the distributor.
During its rotation the distributor deposits in suitably arranged channels
alternate supplies of water containing, mineral, and of clear water for washing the
mineral.
The shaft giving motion to the distributors carries the cams for liberating the
"washing-off" water; or projections on the distributors may be employed for the
same purpose.
JOSEPH COAD.
JOHN EUSTICE.
COMPLETE SPECIFICATION.
An Improvement in appliances for Dressing Tin-ores and the like.
JOSEPH COAD, Tin Streamer, 61, Roskear Row, Camborne, Cornwall, JOHN
EUSTICE, Lecturer in Engineering. 26, Wilton Avenue, Southampton, do hereby
declare the nature of this invention and in what manner the same is to be per-
[Price 8d.1

page_text: formed, to be particularly described and ascertained in and by the following state-
ment:
-
In the "frame" used in dressing tin-ores (on which an improvement is claimed
by this invention) water carrying the powdered ore and gangue-stuff is led in at
the top of an inclined bed of smooth boarding at A. A and spread out by means
of the blocks B B; the heavy minerals remain on the inclined bed of the frame,
the lighter materials being carried by the water to a waste channel at the bottom
of the inclined bed.
Whilst the mineral is being collected on the frame-bed clear water is allowed
to accumulate in a hinged vessel C placed across the top part of the frame, the
vessel is periodically rotated about the hinge D'so as to suddenly liberate the
accumulated clear water which is used to wash the collected mineral into a channel
at the bottom of the inclined bed.
The upsetting" of the vessel C is either effected by hand (after the dirty water
has been shut off and clean water admitted by hand to cleanse the collected mineral
before it is washed off the frame-bed,) or the arrangement is so balanced that when
the vessel is nearly full of water, the weight of the water causes the vessel to upset.
the mineral is then washed off whilst the dirty water is flowing.
A flap connected with the beam E which is raised simultaneously with the
liberation of the washing-down water provides for the division of the waste material
and the tin-stuff, the flap by its weight also brings the vessel C (when empty)
back to its first position.
The invention consists of:-1st. A mechanical arrangement for supplying to the
beds of the frames during definite periods, (a) a quantity of water carrying the
mineral, (b) a quantity of clean water to wash the collected mineral.
2nd. An arrangement of cams and levers (or detents) to permit of the sudden
liberation of the water for washing off the mineral which has accumulated on the
bed of the frame.
In carrying out the invention dirty water containing the mineral is brought
down by a launder F, and led into an annular compartment G of a rotating dis-
tributor, at the same time clean water for washing the mineral is brought down
by a launder H and led by a pipe into another compartment J of the distributor.
Under the distributor is a vessel divided into compartments (in the drawing,
which shows the application to four frames, four divisions are provided for, but
either more or less than four may be used,) as the distributor revolves the dirty
water flows out of the compartment G through the pipes P P into the spaces K, K,,
thence by channels I, L₁ to the tops of the frames at A, and is there spread out in
the usual manner.
With four frames connected, the space K, and channel L, receive dirty water
during three-fourths of the revolution of the distributor, during the remaining
one-fourth of a revolution clean water will pass from the compartment J of the dis-
tributor into the space K, thence to the channel L₁₁ the same cycle of operations
will occur in each of the other frames.
The distributor shaft M receives its motion through bevel wheels N, (or other
suitable gearing.) from the shaft 0 worked by a water-wheel or by other motive-
power, cams R R are fastened to the shaft 0, the cams are so arranged that whilst
the distributor is delivering clean water to the channel L, the detent. T is lifted
by the cam, this frees the beam E, the water which has accumulated in the
vessel C causes the vessel to overbalance, the water thus liberated washes the
mineral off the frame into the channel opened by the raising of the flap connected
to the beam E.
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
First. Instead of hand labour, to employ a mechanical distributor for supplying
to ore-dressing frames during definite periods.

page_text: (a) A quantity of dirty water carrying, mineral
(b) A quantity of clean water to wash the collected mineral.
Second. Instead of liberating the washing-down water by hand, to allow of its
liberation by means of mechanism connected with the distributor so arranged that
the washing-down takes place at a definite period; in the foregoing description
this is effected by means of cams and detents.
Dated this 14th dox of Sentember 1898
JOSEPH COAD.
JOHN EUSTICE.