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Патент USA US2123017

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July 5, 1938.
Filed Aug; 2, 1935
Patented July 5, 1938
2,123,011 >
Karl Meister, Magdeburg, Germany, assignor to
the ?rm Fried. Krupp Grusonwerk Aktienge
sellschaft, Magdeburg-Buckau, Germany
' Application August 2, 1935, Serial No. 34,459
Germany September 1, 1934
1 Claim.
My invention relates to a jaw breaker, the jaws
(Cl. 83-53) .
trates a breaker constructed according to the
of which lie one over the other and form an‘ .invention, in vertical section.
obliquely extending breaking gap, the arrange
ment being such that the lower jaw alone, or
5 both jaws, are adapted to be moved. In all law
breakers, capable of disintegration of the material
in a progressive manner-the breaking gap be
comes narrower towards- the mouth of the jaws
and the quantity of crushed material passing
in therethrough becomes greater. Consequently, a
constant overloading of the lower breaking zones
occurs. In order to avoid this overloading, it has
The upper breaking jaw 2 is secured to the
frame I of the breaker, and beneath this upper
jaw 2 the lower breaking jaw 3 is mounted in a 5
rocking member 4. This rocking member may be
mounted and driven in various ways known
per se. It may, for example, be adapted to piv
ot at its upper end about a shaft 5 rigidly mount
ed in the breaker frame, whilst the lower end may 10
be moved in‘ an upward and‘ downward direction
already been proposed to widen the breaking jaws ‘ by means of an eccentric drive 6. As a further
in the direction of the mouth or delivery gap. example, the rocking member could also be
16 This step, however, is in practice ineffective be
cause the material only follows the surface of the
widened portions within certain limits. It has
also already been proposed to accelerate the pas
_ sage of the disintegrated material by producing
50 a projecting movement in the lower breaking gap
to avoid the. overloading of the lower breaking
zones. This step, however, is contingent upon
' the material being charged in a grain size corre
sponding approximately to the width of the upper
25 gap of the breaker.
The object of the present invention is to pro
duce a jaw breaker with which over-stressing in
.the lower breaking zones and damming of the
material to be broken are obviated, and with this
30 object in view, according to the invention the
inclination of the breaking surface of the lower
breaking jaw is increased in the direction of the
delivery gap. In this case, the form of the break
ing jaw is of minor importance but the clamping
I6 angle between the two breaking jaws must be
made such that the material to be broken does
not jump upwards out of the breaking mouth
during the breaking operation. It is preferable
to adapt the upper breakingjaw to the lower
‘0 breaking jaw as far as possible by giving it an
inwardly curved form
The upper surface of the lower breaking jaw '
may, for example, be so shaped that the upper
surface extends evenly or practically evenly at a
“ small angle with respect to the horizontal, then
falls in a slight curve and finally again falls away
evenly or substantially evenly at a steeper angle.
However, the entire surface may be‘ made in
w arched form without departing from the scope
of the invention‘.
In order that the said invention may be clearly
understood and readily carried into effect, the
_ same will now be described more fully with ref
“ erence to the accompanying drawing which illus
' mounted at its lower end on a support and be
driven at‘ its upper end by an eccentric carried 15
by a driving shaft. ,A‘ccording'to the invention,
the breaking surface of the jaw 3 is increasingly
inclined in the direction of the delivery gap, this
surface extending at a small angle relatively to
the horizontal from a to b, but then merging.20
from b to 0 into a slight downwardly bent curve '
the curve extending downwardly more steeply
from M.
The surface of the upper breaking jaw .2 is
curved inwardly to correspond to the curvature 25
of the lower breaking jaw. However, it could, for
example, also extend evenly. The inclination of
the breaking surface of the upper jaw is prefer
ably such that at the entrance of the breaking
space a further gap is formed which to a certain
extent forms an extension of the charging hopper.
The material to be broken may be charged into ‘
the filling hopper ‘l of the breaker in unlimited
quantities, i. e. ‘the hopper may always be com
pletely filled without fear of over-stressing the
breaking jaws. Owing to the hereinbefore de
scribed formation of the breaking jaw 3, the ma
terial to be crushed is, in the upper part of the
breaking jaw where it lies on a slightly inclined
surface, at ?rst retained somewhat and is only
conveyed slowly towards the delivery gap. As,
consequently, the material remains longer than
usual in the upper breaking space, a much better
utilization of the breaker results in this breaking 45
The material already su?lciently crushed in the
upper breaking mouth is only ‘conveyed forward
with increasing speed in proportion with the
progressive crushing, so that the quantity of 50
crushed material and the conveyance of the ma
terial in all zones of the breaking ‘mouth are sub
stantially adapted to one another. ,The breaker
consequently works in a completely uniform man- '
ner in all its breaking zones, and is not subjected 55
to any over-stressing owing to heavy charging oi.’
individual breaking zones.
The e?ectiveness of the form of the gap here
inbeiore described may be further increased by
making the stroke as long as possible and the
number of rocking operations’ of the rocking law
as large as possible, so that the material prefer
ably completes a zig-zag movement over its con
veying' path in the lower part of the gap, or even
10 a projecting movement in the direction of the
‘delivery gap may be imparted to the material.
The material to be broken will thus, between two
strokes, travel over a path which is in any case
greater than the path over which it would travel
15 in the breaking gap merely owing to‘ the force
of gravity. The magnitude of the movement of
' the material in the direction of the delivery gap,
however, is also dependent on the ‘form. of the
breaking mouth, this movement being greater
20 as the breaking surface repelling the material is
steeper.v According to the present invention, the
increase of speed for this movement towards the
the material, that is to say, with a completely
filled breaking mouth.
What I claim is:
A jaw breaker having a stationary upper law
with an inclined lower crushing face, an inclined
lower jaw pivoted at its upper end and having
a crushing face opposed to said upper jaw, means
for oscillating the lower end of said lower jaw
toward and away from said upper law, a hopper
above the upper end of said lower jaw, said lower 10
jaw having a receiving surface below said hop
per inclined very slightly toward the discharge
end of said jaws, the ‘crushing face of said lower
jaw having a generally convex surface joined to
the lower end of said receiving surface and slop ll
ing downward therefrom, ?rst at an inclination
just enough greater than the inclination of said
receiving‘ area to feed the material thereon at a
slightly greater speed, and then with a gradually
increasing inclination toward the discharge end
of said jaws, said upper jaw having a crushing
face inclined somewhat more steeply than the
average inclination of the face of said lower law,
so as to form a gap of gradually diminishing
size toward the discharge end, the upper end of
25 the lower breaking jaw that a strong projecting said gap being of suitable size to cause the larger
movement and consequently a considerable free
ing from load of the breaking mouth is produced lumps to be ‘crushed in the upper end of the
in the lower zone. This movement of projection gap, and the shape of said gap and the gradually
will not be set up in the upper part of the break; increasing inclination of the face of said lower
ing gap owing to the sllghter inclination of this jaw being so related that the material is crushed
part of the breaking surface,‘ but the material on progressively as it moves down the gap and the
this part of the breaking surface will only be quantity of crushed material and the convey
delivery gap is so considerable owing to the in
creasing inclination of the breaking surface of
moved forward slightly and at the same time in- ' ance of the material in all zones of the gap are
tensely broken, so that the breaker can work
35 without any special quantitative apportioning of
substantially adapted to one another.
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