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Патент USA US2130673

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Sept.‘ 210, 1938.
Filed Jan. 7, 1935
2 Sheets-Sheet 1
Patented Sept. 20, 1938
2,130,673 ‘
Karl Meister, Magdeburg-Sudenburg, Germany,
assignor to the firm Fried. Krupp Grusonwerk
' Aktiengcsellschaft, Magdeburg-Buckau, Ger
Application January 7, 1935, Serial No. 795
In Germany January 16, 1934
1 claim. (o1. 83—53)
My invention relates to crushers having a
moveable or rocking jaw and a non-moveable or
stationary jaw between which the material under
treatment is crushed, whereupon the material
Ul leaves the crusher through a discharge gap at
the lower end of the said jaws.
It is well known to those familiar with crush
ing machinery that the volume of the material
under treatment increases in proportion as it is
1 O disintegrated and the further it is conveyed to
the discharge gap. Thus the work of disintegra-.
tion increases in the lower part of the crushing
zone.w As, moreover, small particles distributed
in the material being fed immediately fall down
into this lower zone, not only the most important
part of the'disintegration work must be executed
in this zone, but also an undesiredsswell of ma
terial occurs there. Up till now, these disadvan
tages could be avoided only by reducing the
2 charge of the crusher, but in this way the capacity
of the latter is diminished. As the swell of ma-,
terial in the lower part of the crushing zone
cannot wholly be avoided in this manner the in
ferior sections of the crushing jaws wear consid
2 m erably and a great deal of dust is produced.
In order to avoid these disadvantages, I provide
a jaw crusher of improved design, the crushing
plates of which have an inclined position and
broaden towards their lower ends, 1. e., towards
3° the discharge gap of the crusher, , so that the
cross section of the crushing zone increases in
the direction of the plates, while it decreases in
the direction normal to them.
Preferably, the inclination of the crushing
535 surfaces varies in the single sections, the upper
parts of these surfaces forming an acute angle,
the lower ones being nearly parallel to each other.
Another feature of the invention consists of
grooves arranged in the crushing‘ surfaces, these
as Q grooves proceeding from the upper edge of each
crushing plate and diverging downwards, taper
ing away into the surface of the plate at. some
Fig. 3 is an elevation of the lower crushing
plate, on the same scale as Fig. 2.
Referring to the drawings, I is the machine
frame having the yoke 2 in a sloping position.
This yoke forms the upper, non-‘moveable jaw.
3 is the lower jaw arranged in juxtaposition to ,
the upper one; this jaw is inclined, too, its in
clination being, however, less than that of the
jaw 2. The upper section of the jaw 3 is hinged
at 4 to the- frame I; the lower part is rocked by 10
the power driven eccentric 5.
The jaws 2 and 3 are ?tted respectively with
crushing plates 6 and 1 of trapezoid shape which
are illustrated in Figs. 2 and 3. These plates 6
and 1 form thus a space the length of which in- 15
creases towards the lower gap, while its breadth
decreases, so that the cross section of the crush
ing zone increases downwards in the proportion
as the volume of the material grows larger when
being distintegrated.
The crushing plate 1 is arranged on the move
able jaw 3. The crushing surface of the plate 6
secured to the stationary yoke 2 is stepped and
provided with grooves of triangular shape pro
ceeding from the upper edge of the plate 6 and 25
tapering away into its surface at a distance from
the lower edge.
By these grooves, ribs 8 are formed that have
steps 9 and diverge downwards. The steps 9 di
minish the height of the ribs 8 at intervals.
In the middle sectionof the plate, the bottom
of each groove broadens. On this broadening
bottom a tooth I0 is arranged being placed be
tween the ribs 8. The teeth lll taper away into
the surface in the same manner as the ribs 8. 35
The lower zone of the surface of the crushing
plate 6 is smooth.
The plate ‘I is provided with similar ribs H
and additional teeth l2, these ribs H having,
however, no steps. The exterior rib II’ on each 40 .
lateral side of plate 1 has only hallI the cross
section of the other ribs ll; thus, it has the
' distance from the lower edge of it, so that the . shape of a right triangle. These exterior ribs ll’
crushing surfaces are smooth near the discharge
gap. The ribs and teeth formed by these grooves
serve to disintegrate the material when it moves
throughthe crushing zone, and, at the same time,
to spread it equally all over the crushing surfaces.
, 50
A structure embodying the features of my in
vention is illustrated in the accompanying draw
ings forming 'a part of this speci?cation, in which
Fig. 1 is a vertical section of a jaw crusher;
Fig. 2 is an elevation of . the upper crushing
55 plate, on a-larger scale;
form lateral rims that prevent the material un
der treatment from'laterally falling down from 45
the plate 1, whereby the space between the move
able jaw 3 and the machine frame i would be
stopped. The lower part of the plate ‘I has a
smooth surface. The apparatus speci?ed before
operates as follows:
The material fed from above between the
crushing plates 6 and 1 consists of pieces of dif
ferent size. Large pieces are crushed in the up
permost zone by the ribs 8\and II when the jawv .
3 is rocked. Smaller pieces slide down into the 55
zone of the additional teeth I!) and I2 and are
disintegrated there together with the crushed
parts coming from the upper zone. Fine par
ticles fall immediately down and leave the crush
ing means by passing through the lowest zone
which is enclosed by the smooth- parts of the
plates 6 and ‘l, as no stopping of the material can
be eifected between these smooth-surfaces.
Other embodiments
10 changes may be made by those skilled in the art
without‘in the least departing from the. scope
of my invention.
I claim:
being secured to the underside of said yoke, the
other plate being arranged on said movable jaw,
the surfaces of said plates being in the form of
alternating grooves and teeth extending down
ward from the upper zone of the plate to the low
er zone adjacent the bottom edge of said plate
providing a smooth lower surface on the plate,
the bottom of each groove broadening downward
and all the teeth diverging downwardly with re
spect to each other and tapering away into the 1
surface of the lower zone of the plate, and addi
tional teeth located respectively in each of the
In a crusher of the type described, a machine
frame having a transverse yoke with a sloping
underside, a movable jaw arranged in said frame
below said yoke and in opposition thereto, means
for rocking said jaw, and crushing plates broad
ening toward their lower ends, one of said plates
broadening bottoms of said grooves, the upper
ends of said additional teeth terminating in the
medial zone of the plate and their lower ends
tapering away into the surface of the lower part
of the plate.
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