IMPROVEMENTS IN THE CONSTRUCTION OF STONE BREAKERS
Year: 1877

page_text: LETTERS PATENT to Edward Gimson, of Stalybridge, in the County of Lan-
caster, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF STONE
BREAKERS."
Sealed the 15th June 1877, and dated the 24th February 1877.
PROVISIONAL SPECIFICATION left by the said Edward Gimson at the Office
of the Commissioners of Patents on the 24th February 1877.
EDWARD GIMSON, of Stalybridge, in the County of Lancaster.
IN THE CONSTRUCTION OF STONE BREAKERS."
"IMPROVEMENTS
This Invention relates to that class of stone breakers well known as " Blake
stone breakers," wherein the stone is broken by the action of a movable jaw against
a fixed jaw.
In my improved arrangement of stone breaker I construct a strong frame having
two fixed jaws facing inwards towards each other, and acting between and against*
these I have two movable jaws facing outwards. These jaws hang upon strong
centres above, and are actuated alternately by means of a rocking lever and two
toggles" placed between them.
«
The rocking lever is centred below, and is rocked by means of an excentric formed
or keyed upon a shaft passing through the same at or near its upper end. The
excentric works in a brass or bearing which slides vertically in a slot in the rocking
lever, so that it merely rocks the latter without raising and lowering it. The brass
is made square, so that when worn at the sides it may be turned one-quarter round,
and used again in that position. The bearings or brasses which support the main
shaft, as well as those of the axes of the rocking lever, are also formed so that they
can be turned one-quarter round for the same purpose.
The lower ends of the movable jaws are connected together by means of two
tension rods meeting at or near the centre; the end of one rod is chased with a
right-hand screwed thread, and that of the other with a left-hand thread, and the
two are connected by a right and left hand screwed nut. By turning this nut in
either direction the tension rod is either lengthened or shortened, and thus the
spaces between the movable and fixed jaws is diminished or enlarged, and the size
to which the stone is broken is consequently regulated.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Edward Gimson in the Great Seal Patent Office on the 24th August
1877.
EDWARD GIMSON, of Stalybridge, in the County of Lancaster.
IN THE CONSTRUCTION OF STONE BREAKERS."
"IMPROVEMENTS
This Invention has for its object to facilitate the operation of crushing and
breaking stone and other minerals into pieces of any required size.
In the class of machines now in use, and known as "Blake stone breakers," there
is but one operating or breaking jaw, and consequently but one size of stone can be
broken at one time, and if it be desired to further reduce the stone the jaw of the
machine has to be reset, and the crushing operation repeated, thereby involving great
loss of time and additional labour. Now by my improved machine I thoroughly
obviate these various disadvantages.
And in order that my said Invention may be better understood and more readily
carried into effect I will now with the aid of the accompanying Drawings, whereon
similar letters of reference indicate corresponding parts, proceed more particularly to
describe the nature of the same.
In my improved machine there are two crushing jaws which are capable of ready
adjustment; these jaws work alternately, and at each revolution of the eccentric
shaft, and deliver twice the quantity of broken stone compared with the ordinary
machine, with little if any increased expenditure of motive power. The size of the
stone to be broken may be regulated at will, as hereafter described.
Figure 1 of the accompanying Drawings is a longitudinal sectional elevation of
my improved stone-breaking machine; Figure 2, a side elevation; Figure 3, an end
view; and Figure 4, a plan of the same.
The working parts of the machine are enclosed within a strong rectangular
framing A, the ends whereof form two fixed serrated vertical jaws B, shewn more
particularly in Figures 1 and 4, and the serrated surfaces of which face inwards
towards the centre of the machine. At the inner part of the machine and facing
the fixed jaws B are two movable jaws C; these are very strongly made, and have
serrated faces similar to the jaws B. Each jaw C is hung upon a strong transverse
shaft, extending across the upper part of the framing, from which shaft the jaw
hangs pendent. Midway between the jaws is fitted a vertical rocking lever D,
which is centred upon a transverse shaft E, extending across the lower part of the
machine.
The rocking motion is communicated to the upper part of the lever D by an
eccentric E¹ formed on the main transverse shaft G. The eccentric E¹ works in a
deep brass or other suitable metal block or bearing piece H, which also moves
vertically in a guide formed in the rocking lever D. With this arrangement the
rotary motion of the eccentric imparts only a rocking movement to the lever, the
bearing piece H simply gliding up and down in the guide in the lever D. The
bearing block H is made of a square figure, so that when worn on one face, by simply
turning the block round a quarter of a turn, a fresh face is presented.
I I may here observe that I also arrange and construct the brasses or bearings of
the main shaft, as well as those of the axes of the rocking shaft, in a similar manner,
so that by turning them round a quarter of a revolution fresh wearing surfaces are
obtained, and thus a great economy of wear and tear is effected.
At the lower part of each of the movable jaws C recesses are formed to receive
the outer ends of a series of "toggles" I, which practically form a series of adjustable
stays for giving motion to the jaws. The inner ends of these toggles enter cor-
responding recesses in such rocking lever D, and each toggle is by preference
furnished with a handle, as shewn in Figure 1, for the convenience of removing it
when required. Thus when the rocking lever is put in motion it imparts
reciprocatory motion to each jaw through the toggles, and according to the length

page_text: of the toggle the size of the broken stone will be regulated, the longer toggles
producing the smaller sizes of broken material.
Another means of adjustment is also provided for regulating the distance between
the fixed and movable jaws; this is done by means of two tension rods J, extending
between the lower inner ears or angles of the movable jaws. The free ends of these
tension rods approach each other near one end of the framing, where they are united
by a right and left-hand threaded nut K, so that by turning this nut in either
direction the threaded ends of the tension rods are brought nearer to or farther from
each other, and the space between the jaws widened or shortened in proportion.
These rods also serve the purpose of keeping the movable jaws C tight upon the
toggles" and rocking lever.
With these several improvements the operation of breaking stone and other
minerals is very greatly facilitated, and the resulting product thereby doubled. At
the same time, the machine is far more economical in use, as its wearing parts are so
carefully protected by the peculiar and novel arrangement of the bearings and sur-
rounding parts.
Having now described and particularly ascertained the nature of my said Inven-
tion, and in what manner the same may be carried into effect, I wish it to be
understood that what I claim is,―
First. The mechanical arrangement and construction of the double movable jaws
and the parts connected therewith, as herein-before described and illustrated.
Second. The method of arranging the bearing parts of my improved stone breaking
machine, as herein-before described and illustrated.
Third. The general arrangement, construction, and combination of parts, together
forming a duplex or double-acting stone-breaking machine, and so delivering a
double stream of broken material, as herein-before described and illustrated.
In witness whereof, I, the said Edward Gimson, have hereunto set my hand
and seal, this Seventh day of August, in the year of our Lord One
thousand eight hundred and seventy-seven.
E. GIMSON. (L.S.)