Year: 1888

page_text: Date of Application, 1st Nov., 1888
Specification Accepted, 14th Dec., 1888
I, JOHN IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the County
of Middlesex, Consulting Engineer and Patent Agent, do hereby declare the nature
of this invention and in what manner the same is to be performed to be par-
ticularly described and ascertained in and by the following statement :-
This invention relates to an improved construction of apparatus for crushing
minerals of all kinds wherein firstly the moveable jaw is actuated directly by an
eccentric on the driving shaft, secondly the connection of the crushing jaw to the
actuating link or lever is effected by a pin so constructed as to give way in case of any
hard material being inadvertently placed between the jaws, and thus prevent the
fracture of the machine, and thirdly wherein the acting surfaces of the jaws are made
reversible so that when the lower parts have become worn by use, the comparatively
unworn upper parts may be made to take their place.
I will proceed to describe the construction of the improved crushing machine for
the above purposes with reference to the accompanying drawing, in which Fig. 1 shews
a longitudinal section, Fig. 2 a sectional plan, and Fig. 3 a cross section.
The moveable crushing jaw A is connected to the actuating link B by a pin con-
sisting of a tubular bolt through which passes a solid screw bolt D of small diameter;
this compound bolt is made of sufficient strength to bear the strain put upon it by the
operation of crushing minerals, but when a hard material, such as a hammer or piece
of iron inadvertently enters between the jaws, the tubular bolt will break and thus
prevent the fracture of the machine. The link B is mounted upon an eccentric part El
of the driving shaft E so that the rotation of the latter causes the requisite to and fro
motion to be imparted to the jaw A. The brasses both for the eccentric E and the
safety pin CD are made to fit with spherical surfaces in corresponding recesses in the
link B, whereby any unequal strain on the bearings is avoided and tho easy driving of
the machine is facilitated. The link B is constructed of two wrought iron or steel straps

page_text: secured over cast metal packing pieces and brasses by screw bolts as shewn, the
distance between the centres of the shaft E and pin CD being rendered adjustable by
the wedge and packing pieces G G₁ so as to adjust the distance between the jaws
as may be required.
The cheeks H H of the fixed and moveable jaws are made of such a form as to be
reversible, that on the moveable jaw being made with bevilled ends fitting undercut
surfaces on the jaw and on a screw bolt 1 so that on withdrawing the latter, the
check H can be taken out and reversed in position. The check H' fits with flanges
over the fixed jaw, and is held in position by wedges JJ, on removing which this
check can also be reversed.
It will be seen that the above improved arrangement of crushing machine has the
advantage of simplicity of construction, fewness of moving parts, easy accessability,
facility in exchanging the crushing cheeks, safety against breakage by means of the
pin CD, and easy adjustability of the distance of the jaws.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
;-
1. In apparatus for crushing minerals, the herein described arrangement whereby
the moveable jaw is actuated directly by an eccentric on the driving shaft the jaw
being connected to the eccentric link by means of a pin so constructed as to give way
when undue strain is put upon the jaw.
2. The arrangement of the crushing cheeks, substantially as herein described, whereby
they can be readily reversed or exchanged when required.
Dated this 1st day of November 1888
ABEL & IMRAY,
Agents for the Applicant.