IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES AND OTHER HARD AND BRITTLE SUBSTANCES
Year: 1876

page_text: LETTERS PATENT to John Dicken Simpson, of Fairfield, Buxton, Surveyor, for
"
the Invention of IMPROVEMENTS IN MACHINERY OR APPARATUS FOR
BREAKING OR REDUCING STONES AND OTHER HARD AND BRITTLE SUBSTANCES."
Sealed the 21st October 1876, and dated the 26th August 1876.
PROVISIONAL SPECIFICATION left by the said John Dicken Simpson at the
Office of the Commissioners of Patents on the 26th August 1876.
JOHN DICKEN SIMPSON, of Fairfield, Buxton, Surveyor. "IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES AND OTHER HARD
AND BRITTLE SUBSTANCES."
My Invention relates to that description of machinery or apparatus for breaking
or reducing stones and other hard and brittle substances, in which the substances
under treatment are operated upon between a stationary jaw and a moveable jaw,
and it has reference to devices or appliances for withdrawing or opening the
moveable jaw alternately with its closing action through the medium of the
toggles.
The Invention consists essentially in drawing back the moveable jaw by the
action of the pitman or eccentric. It may be carried out in a variety of ways, but
the examples herein-after given are arrangements which will be found convenient in
practice.
According to one modification I mount on a fixed centre carried by the framing
a bell-crank lever, one arm of which is connected by a hook, link, or similar
contrivance to the back of the moveable jaw, whilst the other arm of such lever
carries a screw centre or knife edge or other pivot on the edge or extremity of
which the lower part of the eccentric bar or pitman for operating the toggles rests.
The pivot which is by preference mounted in a block fitted detachably in the end
of the bell-crank lever is made adjustable vertically, so that its edge or extremity
may be placed at the requisite height, and sot nuts are provided for securing it in
any adjusted position. In operating with the machine when the bar is elevated
under the action of the eccentric so as to straighten the toggles and close the jaw,
the pivot simply follows the bar in its rise without offering any impediment to its
motion, on the descent however of the bar by the continued motion of the eccentric
the pivot is depressed, whereby the bell-crank lever is turned upon its centic and

page_text: the jaw is drawn back or opened to be again closed by a fresh half revolution of the
shaft and then again drawn back or reopened, and so on repeating the operations in
succession during the working of the machine.
According to another modification the lower extremity of the eccentric bar or
pitman carries a fixed centre, to which is attached one extremity of two sets of rods,
the opposite extremities of which are respectively attached to the moveable jaw and
to the framing of the machine. Each set of rods consists of two parts coupled
together by compound nuts and right and left hand screws, so as to admit of their
length being adjusted as required; and means of adjustment may also be provided
if necessary at the outer extremities of the rods where they are attached to the
moveable jaw and to the framing respectively, or at the outer extremity of one set
only if preferred.
The apparatus may also be further modified in various ways, whilst still retaining
the principle of utilizing the action of the eccentric or pitman for drawing back the
moveable jaw.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Dicken Simpson in the Great Seal Patent Office on the
22nd February 1877.
JOHN DICKEN SIMPSON, of Fairfield, Buxton, Surveyor. “IMPROVEMENTS IN
MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES AND OTHER HARD
AND BRITTLE SUBSTANCES."
My said Invention relates to that description of machinery or apparatus for
breaking or reducing stones and other hard and brittle substances, in which the
substances under treatment are operated upon between a stationary jaw and a
moveable jaw, and it has reference to improved devices or appliances for drawing
back or opening the moveable jaw alternately with its closing action which takes
place through the medium of the toggles.
The Invention consists essentially in drawing back the moveable jaw by the
nction of the pitman or eccentric. It may be carried out in a variety of ways, but
I have shewn in the accompanying Sheet of Drawings, to which I shall now
proceed to refer two modifications as examples of convenient methods of carrying
my Invention into effect.
Figure 1 of my Drawings represents a sectional elevation of a portion of a
machine for breaking stone constructed according to one modification, and
Figure 2 is a similar view illustrating another modification.
The same letters indicate like parts in both the Figures.
A is the frame of the machine; B is the stationary Jaw; C is the moveable jaw;
D is the rocking bar or pitman which may be actuated by an eccentric, a crank, or
otherwise; E, E, are the toggles, through the intervention of which the eccentric
bar or pitman D is caused to move the jaw C towards the jaw B in order to effect
the reduction of the substances introduced between the two jaws.
According to my Invention I utilize the eccentric bar or pitman D for drawing
back or opening, as well as for closing the moveable jaw C.
Referring to Figure 1 of the accompanying Drawings on a fixed centre a carried
by the framing A, I mount a bell crank lever F, one arm b of which is connected
by a hook or link c or similar contrivance to the back of the moveable jaw C,
whilst the other arm d of such lever carries a pivote on the upper extremity of
which the lower part of the eccentric bar or pitman D rests. The pivot e is
supported on a nut f which is fitted so as to be capable of sliding in guide ways
formed in the end of the arın d of the bell-crank lever F, and may be adjusted by
operating the screw f¹ so as to regulate the position of the pivot e as required, and
cause it to engage in one orother of the series of notches e¹ provided on the under

page_text: side of the eccentric bar or pitman D. In operating with the machine when the
bar or pitman D is elevated under the action of the eccentric or crank, so as to
straighten the toggles E, E, and close the jaw C, the pivot e simply follows the bar
or pitman D in its rise without offering any impediment to its motion; on the
descent however of the bar or pitman D by the continued motion of the eccentric
or crank the pivot e is depressed, whereby the bell-crank lever F is turned upon its
centre a, and the jaw C is drawn back or opened to be again closed by a fresh half
revolution of the driving shaft and then again drawn back or reopened, and so on.
repeating the operations in succession during the working of the machine.
According to the modification which is illustrated by Figure 2, the lower end of
the pivot e is jointed at e² to one extremity of two sets of rods F1, F2, the opposite
extremities of which are respectively attached to the moveable jaw C, and to the
framing A of the machine at a². The front set of rods F¹ consists of two parts g, g,
having formed thereon respectively right and left hand screw threads, and the two
rods of the set are coupled together by compound nuts h, h, provided with corre-
sponding internal screw threads by the act of turning, which nuts the length of the
set rods F may be adjusted as required. Set nut i, i, may be employed for
securing the nuts h, h, in any adjusted position, and means of adjustment may also
be provided if necessary at the outer extremity of the rod F where it is connected
to the framing, as shewn at a¹.
The apparatus may also be further modified in various ways, whilst still retaining
the principal of utilizing the action of the eccentric or pitman for drawing back the
moveable jaw.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original, and
therefore claim as the Invention secured to me by the hercin-before in part recited
Letters Patent, is drawing back the moveable jaw by means of the eccentric bar or
pitman, substantially as herein-before described.
In witness whereof, I, the said John Dicken Simpson, have to this my
Specification, set my hand and seal, this Second day of February, One
thousand eight hundred and seventy-seven.
Signed, sealed, and delivered by the
said John Dicken Simpson in
the presence of
JOSIAH TAYLOR,
The Mount,
Buxton,
JOHN DICKEN SIMPSON. (L.S.)
Clerk to the Buxton Local Board.