Jaw Crushers. [Volume: 8, Issue: 3, 1889, pp. 184-187]

o. 3.J CHARCOAL IRON WORKERS. 185
with jaws pivoted from above. Fig. 2
illustrates the general arrangement of / /
the jaws on the Dodge form of crush. /
er. The dotted line indicating the
movement of the face.
A third form of crusher was a combination of the two above indicated,
the fixed jaw common to the two systems, giving place to a movable jaw
pivoted from below as on the Dodge
system; the other jaw being pivoted FIGURE 2.
from above as in the Blake system. Links uniting the upper portions of these jaws gave a combination of the two movements as
shown by dotted lines in Figs. 1 and 2. A later modification by
the same inventor of an arrangement of jaw crusher is shown by
Fig. 3, where one fixed jaw is retained, the other being pivoted
from below as in the Dodge system, but the pivot centre is carried
back from the face of the jaw and by means of rocking arms a
horizontal motion is imparted to the jaw with the object of giving
the face a parallel movement as shown in Fig. 3. The Buchanan
rock breaker, Fig. 3, is constructed
on this principle with the object of
securing both capacity and uniy/formity of product.
'y^~ ( A/ Another form of jaw crusher is
a fixed front jaw, and a movable
jaw operated by a long lever arm
WAV O so that one face rolls against the
other, the arm working on a central pivot and the jaw traversing
FIGURE 3. in an arc of a horizontal circle,
while the opposite face is also on an arc. Sufficient taper is given
to the jaws so that the ore which is fed vertically into the opening
between them will be reduced to the size desired. The Totten
crushers are of this system.
Still another form of crusher is the rotative or oscillating. This
form consists of a suitable hopper of circular form in which is
placed a conical jaw with a motion eccentric to the circumference
of the hopper, the object being to obtain greater capacity by a