Improvements in Toggle Mechanism for Stone Breaking and other Machines.
Year: 1887

page_text: Date of Application, 19th Mar., 1887.
Specification Accepted, 19th Apr., 1887.
Improvements in Toggle Mechanism for Stone Breaking and
other Machines.
I, ROBERT BROADBENT, of the Phoenix Iron Works, Stalybridge in the County of
Lancaster, Machinist 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:-
My invention relates to stone breakers and other machines in which toggles are
used for producing pressure, crushing or breakage and consists in improvements in
the shape of the toggle cushions or liners and the arrangement for holding them
in the parts of the machine to which they are fitted.
On the drawing appended hereunto figure 1 shows those parts of a stonebreaker to
which the toggle cushions are fitted, in the positions they occupy in the machine, all
other parts of the latter being omitted. a is the swing jaw vibrating on the pin a¹;
the pitman receiving an up and down motion from the excenter ; c the toggle
block adjustable by a screw not shewn on the drawing; d and e the toggles : ƒº 9 h
and i the toggle cushions.
Figure 2 shows a front view of the pitman & with toggle cushion g.
Figures 3, 4, 5, 6 and 7 show enlarged views of my improved toggle cushions.
The steel cushions or liners with grooves in which the toggles are held have hitherto
been inserted from the side into dovetails cast or formed in the parts to which they are
applied. With this arrangement they are insufficiently secured against shifting
laterally and in consequence they frequently work out at one end while the machine is
working, or at both ends if they break or split at the middle, as often happens in
actual work. When this working out at the end occurs, the cushions rub against the
sides of the machine frame, absorbing a great amount of power and forming ruts or
grooves in the frame sides, whereby these become weakened and breakages may
result.
The object of my improvements is to prevent the working out of the toggle cushions
at the end, which is effected by inserting them into the parts to which they are applied
from the front and making them of such shapes that they cannot move laterally.

page_text: Figures 3 and 4 show a toggle cushion of my improved construction with straight
sides tapering from the middle towards each end and figures 5 and 6 a cushion with
curved sides. The top half of figure 7 shows a cushion with rounded corrugations and
the bottom half one with sharp cornered corrugations. Recesses of the same shape as
the toggle cushions are cast or formed in the parts to which they are to be applied and
the cushions or liners are inserted into these recesses from the front, as shewn on
figure 2, and are held in by the toggles and the spring bar connecting the swing jaw a
to the toggle block c on the frame.
Instead of both sides of the toggle cushions having the same taper or curvature
from the middle to the ends, one side may have more than the other, or one side may
be flat and the other tapered from the middle towards each end. Cushions shaped and
inserted in the manner herein before described may be used on any machines in which
toggles are used.
By forming and inserting the toggle cushions as described, they cannot work out at
the ends or shift laterally even if they should break.
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
In stone breakers and other machines in which toggles are used for producing
pressure or breakage, inserting the toggle cushions from the front into recesses in the
parts to which the said cushions are applied and making them of such shape that they
cannot shift laterally, substantially as hereinbefore described and shewn on the
drawings.
EMMOTT & Co.,
Agents for the Applicant.