IMPROVEMENTS IN CONCENTRATORS, THE SAME BEING APPLICABLE FOR SEPARATING SUBSTANCES OF DIFFERENT SPECIFIC GRAVITIES
Year: 1873

page_text: LETTERS PATENT to John Antone Peer, Erick Lundquist, and John
Rutherford, all of San Francisco, California, in the United States
of America, for the Invention of "IMPROVEMENTS IN CONCENTRATORS,
THE SAME BEING APPLICABLE FOR SEPARATING SUBSTANCES OF DIFFERENT
SPECIFIC GRAVITIES."
Sealed the 16th January 1874, and dated the 25th November 1873.
COMPLETE SPECIFICATION filed by the said John Antone Peer, Erick
Lundquist, and John Rutherford, at the Office of the Com-
missioners of Patents, with their Petition and Declaration, on the
25th November 1873, pursuant to the 9th Section of the Patent
Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN
ANTONE PEER, ERICK LUNDQUIST, and JOHN RUTHERFORD, all of San
Francisco, California, in the United States of America, send greeting.
,
WHEREAS we are in possession of an Invention for "IMPROVEMENTS
IN CONCENTRATORS, THE SAME BEING APPLICABLE FOR SEPARATING SUBSTANCES OF
DIFFERENT SPECIFIC GRAVITIES," and have petitioned Her Majesty to grant:

page_text: end is suspended by the links or chains G from the upright frame H, or
from some part of the building. The roller F can be raised or lowered
to suit the grade of material passing.
The operating device consists of a cylinder I, which is grooved
3 around its periphery, the groove being formed into two cams J, so that
the arm K which projects into the groove from the table will be alter-
nately pressed back and then allowed to swing suddenly forward and
strike the bottom of the groove which gives the table a sudden jarring
motion in the direction of its length.
In order to give the desired wabbling or side motion the groove in the
cylinder is not made around the cylinder in the same plane, but is
inclined to one side at the offset of one of the cams, and to the other
side at the other cam, as shown at L, Fig. 2. By this construction the
arm K not only falls to the bottom of the groove but is also pushed
alternately to one side and then to the other, so that when the table
swings forward after one cam passes it will swing to one side, and after
the other cam it will swing to the other side. We have thus far
described our Invention as applied to a table having sides and inclined
bottoms, but it will be found much more convenient and effective in
practice to make it in the form of a pan resembling the ordinary gold
washing pan used by miners, only much larger in size.
We have found that a length of about seven feet and a diameter of six
feet (making thereby an oval pan with flaring sides, as shown) is very
suitable. In this case the back part B of the pan is equivalent to the
inclined part B when two bottoms are employed, and the bottom A is
more or less inclined by elevating or depressing the roller F. A gate M
at the front of the pan is so adjusted as to regulate the discharge of the
lighter material. The panning movement is very similar to that of the
hand pan, but is made more effective, being operated by the peculiar
lifting cam and grooved cam combined.
The grooved cam gives the side motion, while the lifting cam imparts
an easy motion forward, raising the back part of the pan somewhat, so
that the lighter sands may pass gently out of the pan leaving the
heavier substances upon the bottom to follow the direction of the per-
cussion on its backward movement. By this means all the heavier
particles gradually move to the back part of the pan where they are
made perfectly clean by the aid of a little water supplied by the pipe N.

page_text: If there is any difference in the specific gravity of the substances to be
concentrated this machine will surely collect them, the concentrator
being adjustable for all kinds of pulp or sands containing sulphurets,
and the action of the machine is such that the fine and coarse sulphurets
follow each other. By this or other equivalent arrangement we are 5
enabled to thoroughly separate and concentrate all substances of different
specific gravities.
Having thus described our Invention, what we claim as new and
desire to secure by Letters Patent is,―
First. The cylinder I with its cams J and the peculiarly inclined 1
groove L or any eqivalent device, constructed to operate the table or pan
and give it the movements, substantially as herein described.
Second. The pan or table with its flaring sides, or provided with
inclined bottoms A and B, and mounted upon the adjustable roller F
and links G, substantially as and for the purpose described.
Third. A concentrating apparatus consisting of the loosely suspended
pan or table capable of motion in all directions, in combination with
the operating cams and a suitable feeding and discharge apparatus,
substantially as herein described.
1
In witness whereof, we, the said John Antone Peer, Erick 2
Lundguist, and John Rutherford, have hereunto set our hands
and seals, this Twenty-ninth day of October, in the year of our
Lord, One thousand eight hundred and seventy-three.
Witnesses,
GEO. H. STRONG,
O. MILTON RICHARDSON.
JOHN ANTONE PEER. (L.S.)
ERICK LUNDQUIST.
JOHN RUTHERFORD.
(L.S.)
(L.S.)