Improvements in Crushing Machines.
Year: 1890

page_text: Date of Application, 1st Mar., 1890
Complete Specification Left, 1st Dec., 1890-Accepted, 3rd Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Crushing Machines.
I, GEORGE NORMAN, 46 Cricket Road, Sheffield, in the County of York, Engineer,
do hereby declare the nature of this invention to be as follows :
My invention is to simplify the construction of machines for crushing ore, quartz
road metal and the like.
In constructing a machine according to my invention, 1 have a suitably formed
framework or body, supporting the crushing jaws, one being fixed and the other
capable of rocking upon an axis or fulcrum, and both provided with renewable
faces.
I construct the back of the rocking jaw with a provision to carry an antifriction
roller, either to revolve upon a central axle, or against roller bearings, and at the
back of the said antifriction roller, I fix the driving shaft with the usual pulley or
pullies and flywheels, and upon the said shaft I construct an eccentric, having any
desired amount of throw or eccentricity, and so placed that its periphery will engage
with that of the antifriction roller.
A coiled spring is attached to the back of the rocking jaw and to the body of the
machine to draw back the jaw, and keep the eccentric and the roller in contact.
It will thus be understood that I reluce the mechanism to the fewest parts possible,
and avoid the use of toggle joints so generally used, by the application of the direct
powerful action of an eccentric working against an antifriction roller carried by a
rocking jaw, or crusher.
Dated the 27th day of Rabenor 1890
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Crushing Machines.
I, GEORGE NORMAN, 46 Cricket Road, Sheffield, in the County of York, Engineer,
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:-
The object of this invention is to simplify the construction of machines for crushing
ore, quartz, road metal and the like.
A machine made according to my invention is illustrated in the annexed sheet of
drawings, in which
Fig. 1, represents a side elevation of a machine, with one side removed.
Fig. 2, plan of machine.
In constructing a machine according to my invention, I provide a suitably formed
framework or body A, to carry the crushing jaws, of which one is fixed and the other
movable upon an axis, and I prefer that the movable jaw is fitted with a loose face ("
so that if damaged it may readily be renewed.
I construct the rocking jaw C, with bearings or other means to carry a roller B,
(or more than one if preferred) either bearing on its own axis, or against antifriction
rolls at the back of it. This jaw is hung upon the axis D, and inclines towards the
fixed jaw E.
At the back of the roller B, I fix the driving shaft F, carried in bearings and fitted
with the usual driving pulley G, and one or more flywheels H.
Inside the body or frame A, and centrally on the shaft is an eccentric or cam I,

page_text: which corresponds in width, with the roller B, the peripheries of both being brought
in contact.
The eccentric may have any desired amount of throw or eccentricity, according to
the purpose for which the machine is constructed.
The rocking jaw C, is hung upon its axis so that after being forced forward, it
follows the receding movement of the eccentric by gravitation, but to render such
return movement more certain, I find it advisable to use a coiled spring J, secured to
the back of the jaw at one end, and to the frame or body at the other end by means
of a bolt K, so that the tension may be adjusted.
The faces of the jaws may be plain or corrugated as desired, and the other details
of the machine may be varied to suit the size of the machine, or the purpose for
which it may be intended; for example the shaft F, carrying the eccentric may be
driven by toothed gearing to increase the power.
It will thus be understood that by my arrangement I reduce the working parts in
number, to a minimum, and by the direct action of an eccentric or cam bearing
against a roller carried by the rocking jaw, I dispense with the toggle joints so
generally adopted in this class of machine and thereby reduce the number of bearing
surfaces.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :
1. A crushing machine having a frame or body of convenient form, with a fixed,
and a rocking jaw E, and C; the rocking jaw having a roller B, for the purpose
specified; a driving shaft with a cam or eccentric I, to engage with the roller B, and
with or without a coiled spring J, all the said parts arranged substantially as herein-
before described and shown.
2. In crushing machines for the purposes before specified, the arrangement of a
direct acting eccentric or cam I, having its periphery in contact with a roller B,
carried by the rocking jaw, substantially as hereinbefore described.
Dated the 29th day of November 1890.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.