IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES AND OTHER HARD AND BRITTLE SUB- STANCES
Year: 1878

page_text: LETTERS PATENT to George Dalton, of Leeds, in the County of York, En-
gineer, for the Invention of "IMPROVEMENTS IN MACHINERY OR APPARATUS
FOR BREAKING OR REDUCING STONES AND OTHER HARD AND BRITTLE SUB-
STANCES
"
Sealed the 19th July 1878, and dated the 7th May 1878.
PROVISIONAL SPECIFICATION left by the said Goorge Dalton at the Office
of the Commissioners of Patents on the 7th May 1878.
GEORGE DALTON, of Leeds, in the County of York, Engineer.
"IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES AND OTHER
HARD AND BRITTLE SUBSTANCES."
My Invention has reference to the machinery or apparatus known as Blake's im-
proved stone-breaking machines, and relates, firstly, to an improvement in the jaws
of the said machines.
On account of the frequent renewals of the jaw faces of these machines consequent
on the heavy work they have to perform, it is necessary to provide some ready
means of fitting the faces in order to facilitate these renewals.
Various methods have been adopted, such for example as castings in wrought-
iron strips which are afterwards planed.
According to my Invention I propose to effect this object by casting in the jaw
faces recesses in place of wrought-iron strips, and filling these recesses with
babbit, or any other similar metal, so as to project a little above the surface.
By introducing the babbit or white metal after the face is chilled, all liability to
warp or spring is avoided, and the soft metal is more easily worked.
My Invention relates, secondly, to an improved method of drawing back the
movable jaw without the aid of a spring.

page_text: In carrying out this part of my Invention, I by preference cast a lug or projection
on the under side of the toggle and recess, the toggle block and jaw stock, so as to
admit an iron hook which I employ to clasp the steel bar on which the toggle
works, and this when screwed to the toggle forms a very effective drawback.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Dalton in the Great Seal Patent Office on the 25th October
1878.
GEORGE DALTON, of Leeds, in the County of York, Engineer. "IMPROVEMENTS
IN MACHINERY OR APPARATUS FOR BREAKING OR REDUCING STONES OR OTHER
HARD AND BRITTLE SUBSTANCES."
My said Invention has reference to the machinery or apparatus known as Blake's
improved stone-breaking machines, and relates,-
First. To an improvement in the jaws of the said machine, having for its object
facilitating the renewal of the jaw faces.
Secondly. To an improved method of drawing back the movable jaw without the
aid of springs.
And in order that my said Invention may be fully understood, I shall now pro-
ceed more particularly to describe the same, and for that purpose shall refer to the
several Figures on the annexed Sheet of Drawings, the same letters of reference indi-
cating corresponding parts in all the Figures.
Figure 1 of the accompanying Drawings represents a transverse vertical secțion
of a portion of a Blake's improved stone-breaking machine with my Invention
applied thereto; Figure 2 is a sectional plan of a portion of the same; and Figure 3
is a back elevation of a jaw face detached.
A is the main framing of the machine; B is the movable jaw; C, C¹, are the
toggles; and D is the connecting rod, through the intervention of which the jaw B
is operated direct by means of an eccentric, or it may be operated through the inter-
vention of a crank and rocking lever, as desired; A' is the stationary jaw which
may form part of the framing A; E, E, are the renewable jaw faces of the stationary
jaw A' and the movable jaw B, respectively.
On account of the frequent renewals of the jaw faces of these machines, consequent
on the heavy work which they have to perform, it is necessary to provide some
ready means of fitting the faces, in order to facilitate such renewals.
Various methods have been adopted for this purpose, such for example as casting
in wrought-iron strips, which are afterwards planed.
According to the first part of my said Invention, I effect the before-mentioned
object by casting in the back of the jaw faces E, E', recesses in place of wrought-
iron strips, and filling such recesses with babbit, or any other similar or suitable
metal, as shewn at a, a, so as to project a little above the surface. This may be
accomplished by cramping on to the back of the jaw face cast with recesses as before-

page_text: mentioned a planed plate with intervening packing strips placed between the
recesses, and of the requisite thickness, according to the required amount of pro-
jection of the strips; the metal is then run into the recesses, and on the removal of
the planed plate after the metal has cooled, the jaw face will be ready for fitting to
the jaw stock or frame, without any farther preparation of the back of the jaw
face.
By introducing the babbit or white metal after the faco is chilled, all liability to
warp or spring is avoided, whilst the use of soft metal of this description is attended
with the further advantage that it is more easily worked than the wrought iron,
which has been previously employed as before mentioned.
The second part of my said Invention, which relates to an improved method of
drawing back the moveable jaw without the aid of a spring, is illustrated in Figures
1 and 2 of the Drawings.
In carrying out this part of my said Invention I employ steel rods upon or
against which the heads of the toggles work, as described in the Specification of
Letters Patent granted to me dated the Sixth day of November, One thousand eight
hundred and seventy-seven, No. 4135, and to those rods I fit hooks attached to the
toggles, so as to form an effective draw back for the movable jaw, recesses being
provided in the toggle bars, and in the jaw stock and frame or attachments thereto
for the reception of the said hooks.
F, F, are the steel rods, the rod F being secured to the movable jaw B by straps
a', a', and the rod F¹ being attached by screwing or otherwise to the duplicate
vertical rods D, D, forming the connecting rod.
The toggle C is recessed at its opposite ends for the reception of the hooks b, b',
which may either consist of hooks proper, or be made as shown, of a shape approxi-
mating to that of a strap.
The hooks or straps b, b', engage with the rods F, F1, respectively, and are attached
by wedges or keys and nuts c, e¹, to the toggle C, the whole thus constituting an
effective drawback.
A similar arrangement may be applied to the toggle C¹, as shewn, the additional
steel rod being marked F, the straps securing the same marked a², and the hooks
or straps and keys for securing the toggle to the rods being marked respectively b², c².
The toggles may be made adjustable in length, as shewn, with respect to the
toggle C in the manner described in the Specification to former Letters Patent
granted to me, bearing date the Twenty-third day of January One thousand eight
hundred and seventy-seven, No. 293.
Having now described and particularly ascertained the nature of my said In-
vention, 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 herein-before in part
recited Letters Patent is,-
First. Fitting the jaw faces to the stock or frame by casting recesses in the back
of such faces, and filling the said recesses with babbit or other white or suitable
metal, substantially as herein-before described.
Second. The peculiar construction and arrangement of toggle mechanism, sub-
stantially as and for the purpose herein-before described, and as illustrated by
Figures 1 and 2 of the accompanying Drawings.
In witness whereof, I, the said George Dalton, have to this my Specification
set my hand and seal, the Eleventh day of October, One thousand eight
hundred and seventy-eight.
>
GEORGE DALTON. (L.S.)