IMPROVEMENTS IN MACHINES FOR CRUSHING OR BREAKING STONE, ORE AND SIMILAR MATERIAL
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by William Robert Lake at the Office
of the Commissioners of Patents on the 11th March 1882. A communication
from abroad by Theodore Augustus Blake of New Haven, Connecticut, United
States of America.
,,
WILLIAM ROBERT LAKE of the firm of Haseltine, Lake, & Co. Patent Agents,
Southampton Buildings, London "IMPROVEMENTS IN MACHINES FOR CRUSHING
OR BREAKING STONE, ORE AND SIMILAR MATERIAL A communication from
abroad by Theodore Augustus Blake of New Haven Connecticut, United States
of America.
This invention relates to improvements in that class of stone or ore crushing
machines commonly known as the "Blake Crushers."
In the use of this class of crushers several difficulties exist, for instance, in
crushing fine work the machine is necessarily slow in its production; again, while
the machines are adapted to crushing very hard material, and are run accordingly,
it frequently occurs that a piece of material harder than the machine can crush,
wedges between the jaws, so that when the power is applied the movable jaw
cannot be advanced the result of this is that some part of the machine must give
way unless per chance the bolt slips and generally something breaks.
The object of this invention is to overcome these difficulties and also to prevent
accidents occasioned by clogging the jaws. The said invention consists essentially of
a vibrating jaw to which the power is applied a stationary or resisting jaw, combined
with one or more jaws hung between said vibrating jaws and stationary jaws upon
axes parallel with the axis of the vibratihg jaw and so that material placed between
the vibrating jaw and the next swinging jaw will communicate the swinging move-
ment of the vibrating jaw to the second, the second to the third, and so on towards
the stationary jaw, the stationary jaw forming the resistance for the last swinging
jaw and each swinging jaw resistance for the swinging or vibrating jaw next in
rear of it, as more fully hereinafter described
$
In carrying the said invention into practice I provide a frame which is of the
usual form and carries on suitable bearings the driving shaft on which is an
eccentric working a pitman which operates a vibrating jaw by means of a toggle
in the usual manner well known in the "Blake" Crusher. Instead of arranging the

page_text: stationary jaw so near the vibrating jaw that the crushing will be effected between
said vibrating and stationary jaws I arrange the stationary jaw at a distance from
the vibrating jaw & between the two I arrange several jaws, hung respectively
upon axes parallel with the axis of the said vibrating jaw. Each of the jaws
hangs entirely independant of the vibrating jaw their surfaces corresponding to
the surfaces of the adjacent jaw, so that the space between each jaw and the
next corresponds to the usual opening or space between the jaws of the "Blake"
Crusher.
Below the jaws or at some convenient point, a longitudinal stationary rod is
arranged, which passes through arms extending down from the jaws a screw-
threaded rod is provided and in rear of each arm are adjusting or set nuts which
form stops for the rear movement of the jaws, that is to say, so that each jaw
comes to a bearing against its own nut when it has completed its rear movement.
Forward of each arm is a spring against which each arm bears in its forward
movement and each of which readily yields to the pressure applied to the moving
jaws.
Supposing for illustration the delivery mouth between the jaws is required to be
one eighth of an inch and the movement of each jaw in the crusher to be one
eighth of an inch, the mouth or delivery between the jaws then in their normal
condition will be one fourth of an inch, and the movement of the first jaw or the
stroke of the machine will be three eighths of an inch.
In ordinary work the resistance will be the same between all the jaws-The first
jaw will move three eighths of an inch carrying the second jaw two eighths of an
inch, that forcing the third jaw one eighth, and the work will progress accordingly-
but should there come between either of the jaws a material so hard as not to be
effected by the crushing power, the results will be that the full movement of the
one jaw two eights will be communicated to the other jaw and carry that jaw one
eighth nearer its next (or the stationary jaw) and will so continue to work until
the obstruction be removed. Or one jaw will remove a little nearer than another
jaw than before dividing the space between the then two working mouths and so
will draw from each one sixteenth of an inch instead of one eighth when all were
working. In any such case the extra resistance between any two working surfaces
is received or taken up by the others whereas if it were not for this capacity of
communicating its movement to the next jaw, or of the resistance being taken up,
the power forces the same extent of movement, and something breaks or gives
way.
The capacity of the machine over a single vibrating pair is increased in proportion
to the number of intermediate jaws, so that a single machine with the two
intermediate jaws. will produce three times the amount of work that a single
vibrating jaw can.
Nuts on a rod permit the adjustment of the jaws so that the delivery mouth may
be varied according to the work required, that is they may be set nearer to or
farther from each other, in such adjustment the pressure of the spring should also
be readjusted by the nuts against which springs bear.
While I have described all the jaws as vibrating and prefer that construction, it
will be understood by those familiar with this class of machines that sliding jaws
with inclined working faces may be substituted for each or all of said vibrating
or swinging jaws, the power being applied to the extreme movable jaw to impart
moving or crushing force to the intermediate jaws towards the Stationary jaws.