Improvements in or relating to Stone Breaking and Ore Crushing Machines.
Year: 1897

page_text: Date of Application, 17th Dec., 1897-Accepted, 22nd Jan., 1898
Improvements in or relating to Stone Breaking and Ore Crushing
Machines.
I, WILLIAM HENRY BAXTER, of 71, Gelderd Road, Leeds, 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:-
This invention relates to that class of Stone breaking and Ore Crushing Machines
in which a central rocking arm or lever, between toggles, is employed for actuating
the crushing jaw of the machine.
Hitherto in this class of machine the whole of the strain both before and during
the pressure or thrust for the crushing operation has been on or below the centre
or axis upon which the central rocking lever works. This not only prevents the
said lever from giving its full crushing power owing to its being forced or moved
backwards by such pressure, but there is also a tendency for the material operated
upon to be forced upwards when between the jaws and thus escaping for a time
from the full crushing point.
Now the object of the present invention is to overcome these defects and at the
same time to reduce as much as possible the friction, and strain on and breakage.
of the working parts of the machine.
According to this invention I apply the toggles to each side of the rocking lever,
but at a point above the axis on which the said lever moves or rocks. From the
back of the crushing jaw, hereafter termed the moveable jaw stock, at a point below
its connection with the toggle, extends a rod which is adjustably connected to the
lower end of a double ended vertical lever pivoted at or about its center to a wooden
or metal beam one or both combined, fixed transversely to the framework of the
machine. A second rod jointed to the lower end of the rocking lever is adjustably
connected to the upper end of the said double ended lever. These rods, or a
pulley and chain may be used in place of the double ended lever hereafter termed
drawback rods,-transmit the return motion to the moveable jaw stock.
In the drawings hereunto annexed I have shown the invention applied to one
of my well-known "Knapping motion Stone Breakers," but I would have it under-
stood that the improvements may be applied to and combined with other makes
or types of Stone Breaking and Ore Crushing Machines.
Fig. 1 is a sectional elevation of a Stone Breaking and Ore Crushing Machine
having my improvements applied thereto.
A is the framework of the machine, B the fixed jaw, C the moveable jaw face,
D the moveable jaw stock mounted or hung on the shaft E, F the crank shaft carried
in bearings G on the framework A, H the fly wheel and I the driving pulley_both
of which are mounted upon the crank shaft F, J the connecting rod and K the
adjustable wedges for regulating the motion of the toggles.
All the above parts may be of the usual and ordinary construction in machines
of this class.
L is the rocking lever of ordinary construction which is made to communicate
:

page_text: with the toggles M. The toggles M may be of the same or varying lengths and
are placed in such a position on each side of the rocking lever as by the to and fro
motion thereof,--imparted to its upper end by the crank F and connecting rod J,-
to communicate motion to and to concentrate the pressure on the moveable jaw
stock D) in a downward direction instead of the pressure being upward.
The rocking lever L is mounted upon the shafts N armed at each of its outer
ends with a runner O arranged to work-in the recess P. The ends of toggles M
at their points of connection with the rocking lever L are made at points above
the centre or axis of the shaft N in order to enable the said lever and toggles to
give their full crushing power to the jaw stock D; and at the same time to ensure
a minimum of movement of the shaft Nyand to prevent, as far as possible, the
material operated upon working up and away from the crushing point of the
jaws.
C
To a point below the ends of the toggles M, say, at or near the base respectively
of the moveable jaw stock D and rocking lever L are jointed the draw back rods Q
and R of different lengths. The outer, ends of the draw back rods are adjustably
connected by, say, locknuts, to a double ended lever S pivoted at or about its centre
to a wooden or metal crossbeam T. The drawback rods are employed for trans-
mitting the return motion to the Jaw Stock D. Or if desired a pulley and a chain
may be used in place of the double ended lever S.
Other parts of thè machine not herein described and the action of the jaws and
other moving parts of the machines may be the same as in my well-known
"Knapping Motion Stone Breaking Machine."
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
:
1. The improvements as described in Stone Breaking and Ore Crushing Machines
substantially such as herein illustrated wherein is combined the rocking lever L,
moveable jaw stock D and toggles M, the latter being arranged, as shown, above
the centre of the shaft N and inclined respectively towards the adjusting wedges K
and said moveable jaw stock D whereby the pressure or thrust is downwards and
constant towards the Crushing points of the jaws.
:
2. In Stone Breaking and Öre Crushing Machines the combination of the move-
able jaw stock D and rocking lever L with the draw back rods Q, R, and double
ended lever S pivoted to the cross beam T, said draw back bars being connected
respectively to the moveable jaw stock and rocking lever below the centre of the
shaft on which the latter works, as and for the purposes set forth.
3. The arrangement and combination of parts forming the machine as a whole
substantially as herein before described and as illustrated in the drawings hereunto
annexed:
Dated this Sixteenth day of December 1897.