An Improvement in or relating to Machines for Breaking Stone and Crushing Ore.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
An Improvement in or relating to Machines for Breaking Stone and
Crushing Ore.
We, JOSEPH BROADBENT and JAMES EDWARD BROADBENT, both of Phoenix
Works, Stalybridge, in the County of Lancaster, Machine Makers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to that class of stone breaking or ore crushing machine
in which a fixed and a movable jaw are employed and consists in an improved
arrangement of mechanism for withdrawing the movable jaw after it has been
forced against the fixed jaw by the ordinary rocking lever or "pitman" and
toggles or other equivalent mechanism.
In the arrangement hitherto employed for this purpose the drawing back of
the movable jaw has been effected by means of an elbow or bell crank lever
which has been actuated by the descent of the "pitman" and it has been found
since the patent oil bath was attached to these breakers, they work steadier and
lift the oil better up into the top step by this improved arrangement and prevents
lifting of the "pitman" off the shaft.
"
According to our invention we relieve the "
pitman entirely from any un-
necessary strain and we draw back the movable jaw by means of a rod attached
to its lower end, and actuated by a combined lever and spring acting upon the
other end of the said rod.
The rod is jointed at one end to the movable jaw and at the other end is pro-
vided with an adjustable fulcrum acting against the lower end of a vertical lever
which is provided with a fulcrum abutting against a solid part of the main
frame of the machine. The upper end of the said lever acts against a strong
coiled or other spring contained in a spring box. Through the centre of this
box (and through the lever and the frame) passes a strong bolt the head of which
abuts against the frame and the outer end thereof is chased with a screw thread
and fitted with adjusting and locking bolts so that the force of the spring may
be adjusted to the degree required for withdrawing the movable jaw as the
'pitman descends and releases the same. As the pitman
" ascends and
25
forces the movable jaw towards the fixed jaw the rod attached to the former
causes the lever to compress the spring the re-action of which withdraws the
novable jaw when released by the descent of the "pitman."
Dated this 24th day of July 1800
GEO. DAVIES & SON,
Agents for the Applicants,
4, St. Ann's Square, Manchester.

page_text: COMPLETE SPECIFICATION.
An Improvement in or relating to Machines for Breaking Stone and
Crushing Ore.
We, JOSEPH BROADBENT and JAMES EDWARD BROADBENT, both of Phoenix
Works, Stalybridge, in the County of Lancaster, Machine Makers, 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:-
Our invention relates to that class of stone-breaking or ore-crushing machines
in which a fixed and a movable jaw are employed and consists of an improved
arrangement of mechanism for withdrawing the movable jaw after it has been
forced against the fixed jaw, by the ordinary rocking lever, or "pitman" and
toggles or other equivalent mechanism.
In the arrangement hitherto employed for this purpose the drawing back of
the movable jaw has been effected by means of an elbow or bell-crank lever
which has been actuated by the descent of the "pitman" causing an unnecessary
train on the latter so as to lift it off the shaft.
By the use of our invention we relieve the pitman" entirely from any
unnecessary strain.
The manner in which our said invention is to be performed or carried into
practical effect will be readily understood on reference to the sheet of drawings
hereunto annexed and the following explanation thereof.
Fig. 1 on the drawings is a longitudinal section and Fig. 2 a plan view of a
stone breaker of the class above indicated showing the application of our inven-
tion thereto, and Fig. 3 is a detached view of a modification thereof.
re is the framing of the machine the fixed jaw, the movable jaw, d the
toggles, e the adjustable abutment and f the main shaft and f* the "pitman."
According to our invention we draw back the movable jaw by means of a
rody attached to its lower end, and actuated by a combined spring and vertical
lever acting upon the other end of the said rod.
The rod g is jointed at one end to the movable jaw e as shown at Fig. 1, and
at the other end is provided with an adjustable fulcrum acting against the
lower end of the vertical lever which is provided with a fulcrum 7 abutting
against a solid part of the main frame of the machine.
The upper end of the said lever i acts against a strong coiled or other spring h
contained in a spring box m. Through the centre of this box (and through the
lever and frame a) passes a strong bolt n, the head of which abuts against the
frame and its outer end is chased with a screw thread, and fitted with adjusting
and locking bolts o, so that the force of the spring may be adjusted to the degree
required for withdrawing the movable jaw as the pitman" f* descends and
releases the same. As the "pitman" f* ascends and forces the movable jaw c
towards the fixed jaw the rod g attached to the former causes the lever i to
compress the spring h, the re-action of which withdraws the movable jaw c when
released by the descent of the pitman.
The detached view Fig. 3, illustrates a modification of the above wherein the
lever is made to swing from a fixed centre or fulcrum at the top and the
spring his placed beneath so that the motion of the lever is in accord with that
of the movable jaw c.
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:-
In machines for breaking stone and crushing ore the arrangements for with-

page_text: mong Ure.
means of an adjustable rod and an adjustable spring lever substantially as
when released by the descent of the "pitman" by
hereinbefore described and illustrated by the drawings annexed.
Dated this 20th day of April 1900.
GEO. DAVIES & SON,
Agents for the Applicants,
4, St. Ann's Square, Manchester.