IMPROVEMENTS IN APPARATUS FOR BREAKING STONES OR OTHER HARD SUBSTANCES
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by William Smith, and John Smith
at the Office of the Commissioners of Patents, with their Petition,
on the 4th April 1874.
We, WILLIAM SMITH, the elder, of Barnard Castle, in the County of
Durham, Ironfounder, and JOHN SMITH, of the same Place, Ironfounder,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
APPARATUS FOR BREAKING STONES OR OTHER HARD SUBSTANCES," to be as
follows:-
This Invention relates to that form of apparatus used for breaking
stones or other hard substances in which two jaws are used, one of such
jaws being fixed and the other moveable, the stones being fed in between
them and a vibrating motion backward and forward being communicated
to the moveable jaw by steam or other convenient power.
Our Invention consists in a novel method of arranging and actuating
the annaratus hv suspending two moveable jaws so connected together

page_text: as to be actuated by a single excentric shaft revolving between them,
and causing them, when in motion backward and forward, to break the
stones between their outer faces (which may be corrugated) and the
inner faces (which may also be corrugated) of two adjustable fixed jaws
attached to the framework of the apparatus.
For the purpose of carrying out our Invention we make two frames
of cast iron or other sufficiently strong material and we arrange them
upon a suitable foundation at a sufficient distance apart for the moveable
jaws described to be suspended between them, and we connect them
together by bolts, stays, or braces. Between the outer ends of these
frames we arrange at each end of the apparatus a fixed jaw which may
be supported by the frames and by strong cross stays which connect
together the ends of the frames and to which the jaws may be bolted.
The inner faces of these jaws are vertical, or nearly so, and may be
corrugated if desired, or the faces may be made moveable so as to be
readily renewed when necessary.
Across the apparatus and at or near its centre we arrange a shaft of
sufficient strength which revolves in bearings formed upon or attached
to the frames already described, and we make this shaft for the whole or
part of its length between the frames excentric, such excentricity being
proportioned to the extent of vibration backward and forward of the
moveable jaws, the lower edges of which are arranged so as to be nearer
to the fixed jaws than their upper parts. The moveable jaws are hung
to the frames by transverse bolts or bars which pass through their upper
ends and rest in suitable bearings formed upon the upper edges of the
frames, and one. of these jaws is arranged upon each side of the excentric
shaft which passes through a suitable die or friction piece against the
sides of which the inner sides of the moveable jaws are pressed by means
of adjustable screws, chains, rods, or swivels, which connect the lower
ends of the two moveable jaws together. The parts of the die and of
the moveable jaws where they press upon it may be curved so so as to
allow sufficient movement between them with little friction. The die
or friction piece may be made either solid or with chilled pieces of metal
or steel inserted at each end. One or more fly wheels may be fitted
upon the revolving shaft...
The stones or other hard substances are fed in at each end of the

page_text: apparatus between the fixed and moveable jaws, the latter being caused
to vibrate backward and forward by the revolution of the excentric
shaft acting upon the die which connects them together, and the stones
are thus crushed.