Improvements in the Jaws of Machines for Crushing or Breaking Stones, Ores, and the like.
Year: 1899

page_text: Date of Application, 19th Jan., 1899
Complete Specification Left, 7th Sept., 1899-Accepted, 7th Oct., 1899
PROVISIONAL SPECIFICATION.
Improvements in the Jaws of Machines for Crushing or Breaking
Stones, Ores, and the like.
We, JAMES EDWARD BROADBENT and JOSEPH BROADBENT, both of the Phoenix
Iron Works, Stalybridge, in the County of Chester, Engineers, do hereby declare
the nature of this invention to be as follows:.
:-
This invention consists in improvements in the jaws of machines for crushing
or breaking stones, ores and the like and the object of our invention is to obviate
the difficulties and inconveniences which have hitherto been experienced in and
resulted from the use of steel jaws or crushing faces in such machines.
..
Hitherto, steel jaws or crushing faces for use in machines for crushing or
breaking stones, ores or like materials have either been made of less thickness
than is requisite for iron jaws to be used in machines of such kind in which case
the machines have been incapable of use with iron jaws and by reason of the wear
of the swinging jaw-stocks the steel jaws in the said jaw-stocks have been liable
to be thrown out of such jaw-stocks in the working of the machines or, in order
that either steel or iron jaws may be used from time to time as is practically
necessary, steel jaws have been made of the thickness requisite for cast iron
jaws and in such cases have in order to be lightened as much as possible been
formed with recesses in their backs. As steel jaws can not be cast so as to have
machined " 80 as
their backs truc planes and can not be planed or otherwise
to be truly or approximately flat or plane on the back it has hitherto been neces-
sary either to provide true or approximately true planes on their backs by means
of a packing or filling of spelter or other material which in the case of the steel
jaws hitherto made of the thickness requisite for cast iron jaws has been made
to fill the recesses on their backs which is troublesome and expensive in conse-
quence of the large quantity of material used, or to mount them in machines
without so providing true or approximately true surfaces on their backs in which
case the jaws have been loose and their use has caused the form of the ribs or
irregularities on the backs of such jaws to be so impressed upon the main-frame-
ends and swinging jaw-stocks of the machines in which they are used that the
said main frame ends and swinging jaw-stocks have been distorted and damaged
so as to be incapable of efficient use with new jaws and have in many cases been
broken.
According to our invention we form the steel jaws to be used in machines for
crushing or breaking stones and like materials, of the thickness requisite for cast
iron jaws but instead of forming them with recesses extending to the back we
form them with hollows in their interiors by casting chambers or cavities therein.
The chambers or cavities in the said jaws may be made to extend to the sides of
the jaws or in cases in which it is permissible or possible may be closed, and we
may provide ribs or struts of any suitable form in the interiors of such jaws.
We form the hollow jaws made according to our invention with plane or approxi-
mately plane backs which may be readily adapted for application to the main
frame-ends and swinging jaw-stocks to which they are to be applied by the use
of spelter or other like material as is usual with cast iron jaws. We prefer to
provide jaws made according to our invention with studs or slight recesses such

page_text: as are ordinarily provided in cast iron jaws to secure the spelter or other material
by means of which their backs may be prepared for application to the main
frame-ends and swinging-jaw-stocks to which they are to be applied.
Dated this Eighteenth day of January 1899.
HOWARD
CHEETHAM,
Manchester, Agent to the Applicants.
Improvements in the Jaws of Machines for Crushing or Breaking
Stones, Ores, and the like.
We, JAMES EDWARD BROADBENT and JOSEPH BROADBENT, both of the Phoenix
Iron Works, Stalybridge, in the County of Chester, Engineers, do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
This invention consists in improvements in the jaws of machines for crushing
or breaking stones, ores and the like and the object of our invention is to obviate
the difficulties and inconveniences which have hitherto been experienced in and
resulted from the use of steel jaws or crushing faces in such machines.
Hitherto, steel jaws or crushing faces for use in machines for crushing or
breaking stones, ores or like materials have either been made of less thickness
than is requisite for iron jaws to be used in machines of such kind in which case
the machines have been incapable of use with iron jaws and by reason of the wear
of the swinging jaw-stocks the steel jaws in the said jaw-stocks have been liable
to be thrown out of such jaw-stocks in the working of the machines or, in order
that either steel or iron jaws may be used from time to time as is practically
necessary, steel jaws have been made of the thickness requisite for cast iron
jaws and in such cases have in order to be lightened as much as possible been
formed with recesses in their backs. As steel jaws can not be cast so as to have
their backs true planes and can not be planed or otherwise machined" so as
to be truly or approximately flat or plane on the back it has hitherto been neces-
sary either to provide true or approximately true planes on their backs by means
of a packing or filling of spelter or other material which in the case of the steel
jaws hitherto made of the thickness requisite for cast iron jaws has been made
to fill the recesses on their backs which is troublesome and expensive in conse-
quence of the large quantity of material used, or to mount them in machines
without so providing true or approximately true surfaces on their backs in which
case the jaws have been loose and their use has caused the form of the ribs or
irregularities on the backs of such jaws to be so impressed upon the main-frame-
ends and swinging jaw-stocks of the machines in which they are used that the
said main-frame-ends and swinging jaw-stocks have been distorted and damaged
so as to be incapable of efficient use with new jaws and have in many cases been
broken.
According to our invention we form the steel jaws to be used in machines for
crushing or breaking stones and like materials, of the thickness requisite for cast
iron jaws but instead of forming them with recesses extending to the back we
form them with hollows in their interiors by casting chambers or cavities therein.
The chambers or cavities in the said jaws may be made to extend to the sides of
the jaws or in cases in which it is permissible or possible may be closed, and we
may provide ribs or struts of any suitable form in the interiors of such jaws.
We form the hollow jaws made according to our invention with plane or approxi-
mately plane backs which may be readily adapted for application to the main-
frame-ends and swinging jaw-stocks to which they are to be applied by the use

page_text: of spelter or other like material as is usual with cast iron jaws. We prefer to
provide jaws made according to our invention with slight recesses such as are
ordinarily provided in cast iron jaws to secure the spelter or other material by
means of which their backs may be prepared for application to the main-frame-
ends and swinging jaw-stocks to which they are applied.
In the accompanying drawings two hollow steel jaws formed in accordance with
our invention are illustrated. Fig. 1 is a front elevation, Fig. 2 is a side eleva-
tion and Fig. 3 is a plan or end view of a steel-jaw intended for use on the main-
frame-end of a machine for crushing or breaking stones, ores or the like and
Figs. 4 and 5 are longitudinal and transverse sections taken respectively on the
planes indicated by the lines A A and B B of Fig. 1. Fig. 6 is a front elevation,
Fig. 7 is a side elevation and Fig. 8 is a plan or end view of a steel jaw intended
for use on the swinging jaw-stock of a machine for crushing or breaking stones,
ores or the like and Figs. 9 and 10 are longitudinal and transverse sections taken
respectively on the planes indicated by the lines C C and D D of Fig. 6.
Each of the steel jaws illustrated in the accompanying drawings is formed by
casting and is formed with hollows in its interior by chambers or cavities a
being cast therein, the partitions between the chambers or cavities a serving as
the ribs or struts requisite. The chambers or cavities a nearest the sides of the
jaws communicate with holes extending to the sides of the said jaws. Each
chamber or cavity a is made to communicate with that or those adjacent to it
laterally by means of passages or holes e made in the partitions separating them
so that the cores used in casting the jaw may be properly supported during the
casting and afterwards removed. The jaws illustrated in the accompanying
drawings are provided with plane backs d to bear, with the interposition of a
layer of spelter or other like material, against the swinging jaw-stocks or main-
frame-ends to which they are applied. The provision in steel jaws made accord-
ing to our invention of recesses similar to those ordinarily provided in cast iron
jaws to secure the spelter or other material employed to prepare the backs of such
jaws for application to the main-frame-ends and swinging jaw-stocks to which
they are to be applied may be accomplished in the casting of such steel-jaws as
in the usual way of casting cast iron jaws.
The formation of steel-jaws with chambers or cavities in their interiors and
with plane or approximately plane backs, according to our invention enables
such steel-jaws to be readily adapted like cast iron jaws by the use of only a
small quantity of spelter or like material for application to the main-frame-
ends and swinging jaw-stocks to which they are to be applied and so enables such
steel-jaws to be made of the thickness of cast iron jaws so as to be able to replace
or be replaced by cast iron jaws without alteration of the machines in which they
are to be applied, while being light and also enables such steel-jaws to be securely
fixed for use and to be used without being liable to oscillation which would cause
injury to the main-frame-ends and swinging jaw-stocks to which they are applied
and would also diminish the efficiency of the machines in which such steel-jaws
are used.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
For use in a machine for crushing or breaking stones, ores or the like, a steel
jaw formed with a plane or approximately plane back and with hollows in its
interior for the purposes and substantially in the manner herein before described.
Dated this Sixth day of September 1899.
HOWARD
CHEETHAM,
Manchester, Agent to the Applicants.