IMPROVEMENTS IN ROCK AND ORE CRUSHERS
Year: 1879

page_text: LETTERS PATENT to John Thomson King, of Liverpool, in the County of
Lancaster, Patent Agent, for the Invention of "IMPROVEMENTS IN ROCK AND
ORE CRUSHERS." A communication from abroad by Charles Forster, of
Pittsburgh, Pennsylvania, United States of America.
Sealed the 30th April 1880, and dated the 25th November 1879.
PROVISIONAL SPECIFICATION left by the said John Thomson King at the
Office of the Commissioners of Patents on the 25th November 1879.
JOHN THOMSON KING, of Liverpool, in the County of Lancaster, Patent Agent.
"IMPROVEMENTS IN ROOK AND ORE CRUSHERS." [A communication from abroad
by Charles Forster, of Pittsburgh, Pennsylvania, United States of America.]
In rock and ore crushing machines as heretofore made several different move-
ments have been imparted to one or both of the crushing jaws; first, they have
been caused to approach each other by a vertical movement; second, they have
been operated by a forward and backward motion; third, one or both jaws have
been pivoted and caused to swing forward by a vertical vibration against the other
or each other; and, fourth, two or more of the above mentioned movements have
been combined to operate the jaw or jaws in various ways.
My Invention consists, first, in constructing a rock and ore crushing machine
with a jaw so pivotted as to be capable of oscillating laterally in front of a fixed
jaw, and in giving the necessary oscillation to such oscillating jaw by means of
power applied to a lever forming part of or attached to the said jaw.
Second. In constructing the fixed and moving jaws with curved or angular
surfaces, so that during oscillation the rock or ore will be nipped, crushed, and
ground between the concave portion of one jaw and the convex faces of the
other.
Third. In carrying the pivot on which the moving jaw works down below the
bottom of the nipping, crushing, and grinding face, and in providing guides to
prevent the strains on the jaw during action from forcing it out of position.
Fourth. In fitting the stationary jaw with a wedge piece or equivalent device
whereby the lower part of such jaw may be moved up to its work as wear takes
place.
The jaws may be adjustable and removable, and the framework and means of
applying power, whether by hand or fluid moved engines, may be of any desired or
suitable construction.

page_text: ore or stone shall be nipped or crushed between the centre rib a³ of the fixed jaw
and the cheek d' of the moving jaw. These corrugations may be repeated if the
jaws are widened. In addition to the crushing motion the jaws have a grinding
motion, so that the rock or ore is not only crushed but ground between their
working faces. The moving jaw d has a rigid aria d² extending back to the guide
plate p, upon which it rests and moves. A reciprocating movement is imparted to
the arm d by the link q and cam wheel », or other suitable mechanism. Power is
applied to the crusher by means of the band wheel 8, or by any other known
mechanical device suitable for that purpose.
When the crusher is in operation a lateral vibration or oscillation is by means of
the arm and its power connections imparted to the jaw d, which causes its
working face to grind and crush the rock or ore against the face of the fixed jaw a
The rock or ore as it is broken sinks in the opening v until finally it is discharged
therefrom. The bits or faces of the jaws are removable, as seen by the joints z, and
are keyed into the jaws in any desired manner. The jaw a is adjustable to enlarge
or reduce the width of the opening v by means of liners inserted between it and
the frame b. The principal wear is upon the lower part of the jaws, and it is
often desired to reduce the width only at the discharge opening e
The lower edge
of the jaw a may be advanced by raising the wedge or incline t (shown in Figure 3)
against which it rests, the wedge being raised by the screw rods u extending up
between the jaw and bed frame b. The guide plate p upon which the rigid arm d
moves prevents the jaw d from being "canted" over backward so as to throw the
stem fout of its socket by the pressure on its working face.
Having now described and illustrated the nature of the said Invention in such
nanner that others will be enabled to carry my improvements into effect, I
claim:-
First. The jaws a and d, one of which is movable, such movable jaw having a
grinding motion laterally across the face of the other jaw, as distinguished from an
up and down grinding motion, substantially as and for the purposes set forth.
Second. The jaws a and d corrugated, as shown, that is, with the full parts of the
corrugations in one jaw opposite to the hollow parts of the corrugations in the other
jaw. When one of such jaws is arranged for operation laterally across the face of
the other and at right angles, or nearly so, to the line of the corrugations for the
purpose of securing a crushing motion between the full parts of the corrugations,
substantially as and for the purposes described.
Third. The jaw d chambered out at i and provided with a pivot or journal ƒ in
combination with the bearing h, substantially as and for the purposes described.
Fourth. In combination with the fixed jaw a and bed frame b, the wedge or
incline t for advancing the lower edge of the jaw a, substantially as described.
In witness whereof, I, the said John Thomson King, have hereunto set my hand
and seal, this Twenty first day of May, in the year of our Lord One thousand
eight hundred and eighty.